CN101036334B - Transmitting and receiving method, and radio apparatus utilizing the same - Google Patents

Transmitting and receiving method, and radio apparatus utilizing the same Download PDF

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CN101036334B
CN101036334B CN200580033853.4A CN200580033853A CN101036334B CN 101036334 B CN101036334 B CN 101036334B CN 200580033853 A CN200580033853 A CN 200580033853A CN 101036334 B CN101036334 B CN 101036334B
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antenna
data
signal
mimo
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CN101036334A (en
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中尾正悟
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Zhongheng Technology Co ltd
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Sanyo Electric Co Ltd
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Abstract

A processing unit transmits, from at least one of a plurality of antennas, data corresponding respectively to the plurality of antennas. A control unit generates request signals with which to let a second radio apparatus supply information on rates at the second radio apparatus. When transmitting the request signal, the processing unit also transmits, from a plurality of antennas which includes antennas other than the antennas that transmit the data, known signals corresponding respectively to the plurality of antennas.To improve precision of control of data transmission. A processing part (22) transmits, from at least one of a plurality of antennas (12), data associated with each of the antennas (12). A control part (30) generates a request signal for causing a second radio apparatus to provide rate information of the second radio apparatus. When transmitting the request signal, the processing part (22) also transmits, from a plurality of antennas (12) also including ones other than an antenna (12) from which to transmit the data, known signals associated with the respective antennas (12).

Description

Sending method and the wireless device that utilizes them
Technical field
The present invention relates to transmission technology and reception technique, particularly with a plurality of antenna transmission signals or by the sending method and the method for reseptance of a plurality of antenna receiving signals with utilize their wireless device.
Background technology
As can high speed transmission data and be suitable for the communication mode of multi-path environment, OFDM (the Orthogonal Frequency Divison Multiplexing) modulation system of one of multi-carrier mode be arranged.This OFDM modulation system is applicable to standardized size---the IEEE802.11a of WLAN (Local Area Network), g and HIPERLAN/2 etc.Burst signal in this WLAN is done the media transmission through the transmission line environment that changes together in time usually, and receives the influence of frequency selective attenuation, infers so receiving system is dynamically carried out transmission line usually.
Because receiving system is carried out transmission line and is inferred, so in burst signal, 2 kinds of known signals are set.One is in the part of the front of burst signal, to the known signal that all carrier waves are provided with, so-called lead code (preamble) or training signal.Another is in the data interval of burst signal, to the known signal that portion of carriers is provided with, so-called pilot tone (pilot) signal (for example with reference to non-patent literature 1).
Non-patent literature 1:Sinem Coleri, Mustafa Ergen, Anuj Puri; And Ahmad Bahai, " Channel Estimation Techniques Based on Pilotarrangementin OFDM Systems ", IEEE Transactions on broadcasting; Vol.48; N0.3, pp.223-229, Sept.2202.
In radio communication,, the adaptive array antenna technology is arranged for one of technology of effectively utilizing frequency resource.Adaptive array antenna technology, in each of a plurality of antennas, the amplitude of the signal of control and treatment object and phase place, thereby the directional diagram of control antenna.Utilizing this adaptive array antenna technology, make in the technology of data transmission rate high speed, MIMO (Multiple Input Multiple Output) system is arranged.In this mimo system, dispensing device and receiving system possess a plurality of antennas respectively, set the channel corresponding with each antenna.In other words, for the communication between dispensing device and the receiving system, be set to the channel till the maximum antenna number, thereby improve data transmission rate.And then, make the combination of OFDM modulation system and such mimo system after, can make the further high speed of data transmission rate.
In mimo system,, can also regulate data transmission rate through the antenna number that the increase and decrease data communication should be used.And then, after the application adaptation modulation, can regulate data transmission rate in more detail.In order conscientiously to carry out the adjusting of this data transmission rate, dispensing device preferably from receiving system obtain about be suitable for and receiving system between the information (below be called " transfer rate information ") of data transmission rate of wireless transmission link.On the other hand, when in mimo system, transmitting transfer rate information aperiodically, dispensing device sends the signal be intended to ask to send transfer rate information (below be called " transfer rate request signal ") to receiving system.
In addition, in the combination of the directional diagram of the dispensing device of mimo system and the antenna in the receiving system, for example following.One is that the antenna of dispensing device has omni-directional pattern, and the antenna of receiving system has the situation of carrying out the directional diagram that adaptive array signal handles.Another is the antenna of dispensing device and the antenna of receiving system, and the both has the situation of the directional diagram that carries out the adaptive array signal processing.The former can simplified system, and the latter is then because the directive property directional diagram of control antenna in further detail, so can improve characteristic.When adopting the latter; Dispensing device is handled for the adaptive array signal of carrying out transmission; Need to receive the known signal that transmission line is inferred usefulness from receiving system in advance; In order to improve the precision of adaptive array antenna control, dispensing device is preferably obtained between a plurality of antennas that a plurality of antennas that dispensing device comprises and receiving system comprise transmission line property separately.Therefore, receiving system is inferred the known signal of usefulness from all antenna transmission transmission lines.Below, the radical of the antenna that will should use with data communication is irrelevant, infer the known signal of usefulness by the transmission line of a plurality of antenna transmission, is called " training signal ".
Applicant of the present invention under this situation, has found following problem.If in the decision of the rate information of receiving system, comprise error, adopt the communication of mimo system mistake will occur so, cause the reduction of transmission quality and the reduction of active data transfer rate.Therefore, the rate information that needs correct decision receiving system.In addition, in order to improve the active data transfer rate, between dispensing device and receiving system, the signal beyond the data is the transmission of transfer rate request signal and standard signal for example, and is preferably less.Have, when some in dispensing device and the receiving system was battery-operated, power consumption was preferably lower again.
Summary of the invention
The present invention is to the development of this situation, and its purpose is to provide sending method that improves the control precision when the transmission data and the wireless device that utilizes it.
In order to solve above-mentioned problem, the wireless device of a kind of kind of attitude of the present invention possesses: sending part, this sending part to the wireless device of the communication object corresponding with the variable data transfer rate, send the data corresponding with each antenna by at least one antenna in a plurality of antennas; Control part, this control part generate this wireless device is provided be suitable for and the wireless device of communication object between the request signal of information of data transmission rate of wireless transmission link, the request signal that generates as data, is sent by sending part.Sending part also from comprising a plurality of antennas for the antenna beyond at least one antenna that sends data, sends each the corresponding known signal with a plurality of antennas when sending request signal.
In the essential factor of decision " data transmission rate ",, the radical of the antenna that uses in the encode rate, mimo system of modulation system, error correction is arranged as an example.Here, " data transmission rate " both can be according to their combination arbitrarily decision, also can be according to a decision in them.
After adopting this appearance attitude; Because when the wireless device of communication object sends request signal; Also from a plurality of antenna transmission known signals; So can obtain the data transmission rate in the wireless device of communication object and be information, improve the precision of information according to the newly-generated data transmission rate of known signal.
Sending part can be at least to carrying out beam-shaping with each corresponding known signal of a plurality of antennas when sending request signal.At this moment, carry out beam-shaping after, can increase the signal strength signal intensity in the wireless device of communication object, can obtain and have the more information of the data transmission rate of the value of high transmission rates.
And then can also possess selection portion, at least one antenna that should use when the data from the wireless device of communication object is selected in a plurality of antennas to receive by this selection portion.Sending part can also be from the antenna transmission known signal of selection portion selection.At this moment, because reduced the antenna number that transmit control signal, can reduce power consumption.
And then can also possess acceptance division, this acceptance division utilizes a plurality of antennas, receives the known signal of usefulness from the wireless device of communication object.The known signal that selection portion can receive according to acceptance division is derived each the corresponding radio quality with a plurality of antennas, preferentially selects the good antenna of radio quality.
" radio quality " is the quality of radiolink, and it can be estimated according to parameter arbitrarily, for example comprises signal strength signal intensity, postpones to disperse, amount of interference.In addition, can also estimate according to their combination.At this moment, because preferentially select the good antenna of radio quality, can suppress the deterioration of the transmission quality of data.
And then can also possess: acceptance division, this acceptance division utilizes a plurality of antennas, receives the known signal of usefulness from the wireless device of communication object; Selection portion, at least one antenna of known signal is selected should send in a plurality of antennas by this selection portion.The known signal that selection portion can receive according to acceptance division is derived each the corresponding radio quality with a plurality of antennas, preferentially selects the good antenna of radio quality.At this moment, can independently set the radical of the antenna that should use when the transmission and receive when the radical of the antenna that should use.
Other kind attitude of the present invention also is a wireless device.This device possesses: selection portion; At least one day line options portion that should use when the data from the wireless device of communication object is selected in a plurality of antennas to receive by this selection portion, and at least one antenna of known signal is selected should send in a plurality of antennas by this selection portion; Sending part, the antenna that at least one antenna that this sending part is selected by selection portion comprises sends the data corresponding with each antenna to the wireless device of communication object, but also by at least one antenna transmission known signal corresponding with each antenna of selection portion selection.
After adopting this appearance attitude, because receive known signal from the antenna that should receive data, thus can suppress the deterioration of the directive property in the wireless device of communication object, and because select receive the antenna of data, so can reduce power consumption.
Other kind attitude of the present invention also is a wireless device.This device is the wireless device that receives by the data of the variable data transfer rate of at least one antenna transmission in a plurality of antennas and data corresponding with each antenna; Possess: acceptance division, this acceptance division receive by also comprise for the known signal of a plurality of antenna transmission of the antenna beyond at least one antenna that sends data and also with each corresponding known signals of a plurality of antennas; Receive the answer vector calculating part, this receives the known signal that the answer vector calculating part receives according to acceptance division, calculates the reception answer vector corresponding respectively with each a plurality of antenna; The correlation between the reception answer vector corresponding with each a plurality of antennas difference is calculated according to receiving the reception answer vector that the answer vector calculating part calculates by correlation computations portion, this correlation computations portion; Determination section, the correlation that this determination section calculates according to correlation computations portion, decision is as far as the data transmission rate of data.
After adopting this appearance attitude, because consider to receive the correlation between the answer vector, so can reflect and to improve the correctness of the data transmission rate of decision by the influence between the signal of each transmission in a plurality of antennas.
Other kind attitude of the present invention also is a wireless device.This device is the wireless device that receives by the data of the variable data transfer rate of at least one antenna transmission in a plurality of antennas and data corresponding with each antenna; Possess: acceptance division, this acceptance division receive by also comprise for the known signal of a plurality of antenna transmission of the antenna beyond at least one antenna that sends data and also with each corresponding known signals of a plurality of antennas; Receive the answer vector calculating part, this receives the known signal that the answer vector calculating part receives according to acceptance division, calculates the reception answer vector corresponding respectively with each a plurality of antenna; Power ratio calculating part, this power ratio calculating part calculate the power ratio between the reception answer vector corresponding with each a plurality of antennas difference according to receiving the reception answer vector that the answer vector calculating part calculates; Determination section, the power ratio that this determination section calculates according to the power ratio calculating part, decision is as far as the data transmission rate of data.
After adopting this appearance attitude, because consider to receive the power ratio between the answer vector, so can reflect and to improve the correctness of the data transmission rate of decision by the influence between the signal of each transmission in a plurality of antennas.
The known signal that acceptance division receives uses a plurality of carrier waves, and determination section can be according to the some states in a plurality of carrier waves, and decision is as far as the data transmission rate of data." in a plurality of carrier waves some ", can be the correlation in all carrier wave and strength ratio is best, the poorest, with predesignate regular corresponding.In addition, can calculate the average of correlation and strength ratio in all carrier waves, thus corresponding with a carrier wave of simulation.In addition, can also calculate the average of correlation and strength ratio in the portion of carriers.At this moment, can be applied to use the system of a plurality of carrier waves.So-called " state " comprises correlation and power ratio, so long as the information of the quality of expression signal gets final product.
Acceptance division also receives the request about the information of data transmission rate when receiving known signal.Can also possess notice portion, this notice portion is replied as the request that receives for acceptance division, the data transmission rate of notice determination section decision.At this moment, because when receiving known signal, also receive request signal,, can supply with the high data transmission rate of precision so can notify the data transmission rate of decision.
Other kind attitude of the present invention also is a wireless device.This device possesses: generation portion, this generation portion generate with a plurality of antennas in corresponding respectively the 1st known signal of at least one antenna, with also comprise for the 2nd corresponding respectively known signal of a plurality of antennas of at least one antenna antenna in addition of sending the 1st known signal, comprise and distinguish the burst signal of corresponding data at least one antenna that sends the 1st known signal; Sending part, this sending part send the burst signal that generation portion generates through a plurality of antennas.
An example of " the 1st known signal " is in order to set the signal of AGC in the wireless device of communication object; An example of " the 2nd known signal " is in order to infer the signal of transmission line property in the wireless device of communication object.After adopting this appearance attitude because will be decided to be for the antenna that sends the 1st known signal and data same, so the recipient can be used for the reception of data with the result that infers according to the 1st known signal, the characteristic of raising Data Receiving.
Generation portion can dispose following 2 parts in the 2nd known signal in the different moment: for the part corresponding with at least one antenna of sending the 1st known signal with in order to send the 1st known signal and the corresponding part of antenna beyond at least one antenna.At this moment; Since can reduce in the 2nd known signal for the corresponding part of the antenna beyond at least one antenna that sends the 1st known signal for influence for the corresponding part of at least one antenna of sending the 1st known signal; So can improve the precision of inferring according to the 2nd known signal for the corresponding part of at least one antenna of sending the 1st known signal the recipient.
Generation portion can make the quantity of the antenna that send the 1st known signal, is increased to till the quantity of the antenna that send the 2nd known signal, cut apart and increase before each corresponding data of antenna, make the data of cutting apart corresponding with the antenna of increase.At this moment, owing to can make,, improve the receiving feature of data so the recipient can use the result who infers according to the 1st known signal in receiving data for the antenna that sends the 1st known signal and data is same antenna.
Generation portion, on one side can use a plurality of subcarriers, Yi Bian the data that comprise in the production burst string signal as unit, are carried out cutting apart of data with subcarrier.At this moment, can reduce interference between the data of cutting apart.
Other kind of another kind attitude of the present invention also is a wireless device.This device possesses: sending part, and this sending part sends burst signal from each of a plurality of antennas; Generation portion, this generation portion generate the burst signal that sent by sending part, and comprise and each the corresponding known signal of a plurality of antennas and the burst signal of the data of the back segment that is configured in known signal.Generation portion comprises: at least one in data and a plurality of antenna be at once, make should corresponding antenna quantity increase, thereby make these data corresponding with a plurality of antennas; In determination section, make data and a plurality of antenna at once in generation portion, determine than making the corresponding low data transmission rate of data transmission rate before of data with a plurality of antennas.
After adopting this kind attitude, make data and a plurality of antennas each at once, even, when being not suitable for the transmission of data, also can reduce the generation of the mistake of data through reducing data transmission rate from the characteristic of the wireless transmission link of corresponding antenna.
Generation portion; Can be to known signal and data; Use a plurality of subcarriers, each of a plurality of antennas as unit, is changed the combination of each subcarrier that should use of known signal; And when making data and a plurality of antennas are corresponding, in these data, use combination by the subcarrier in the known signal of the antenna transmission identical with sending data.At this moment, make data and a plurality of antenna, in known signal and data corresponding, using same subcarrier, thereby can be easy to each data is selected the subcarrier that use with 1 antenna at once.
Other kind of another kind attitude of the present invention also is a wireless device.This device possesses: sending part, and this sending part sends burst signal from each of a plurality of antennas; Generation portion, this generation portion generate the burst signal that sent by sending part, and comprise and each the corresponding known signal of a plurality of antennas and the burst signal of the data of the back segment that is configured in known signal.Generation portion comprises: at least one in data and a plurality of antenna be at once, make should corresponding antenna quantity increase, thereby make these data and a plurality of antenna corresponding cells; To known signal and data; Use a plurality of subcarriers; With each of a plurality of antennas is unit; Change the combination of each subcarrier that should use of known signal, and when making said data and said a plurality of antennas are corresponding, in these data, use unit by the combination of the subcarrier in the known signal of the antenna transmission identical with data.
After adopting this kind attitude, make data and a plurality of antennas each at once, in the known signal and data corresponding, use same subcarrier, thereby can be easy to each data is selected the subcarrier that use with 1 antenna.
Other kind of another kind attitude of the present invention is a sending method.This method is by at least one antenna in a plurality of antennas; Send the sending method with the corresponding data of each antenna to the wireless device of the communication object corresponding with the variable data transfer rate; Generation this wireless device is provided be suitable for and the wireless device of communication object between the request signal of information of data transmission rate of wireless transmission link; When the request signal that generates is sent as data; Also, send each corresponding known signal with a plurality of antennas from comprising a plurality of antennas for the antenna beyond at least one antenna that sends data.
Other kind of another kind attitude of the present invention also is a sending method.This method is by at least one antenna in a plurality of antennas; Send the sending method of the data corresponding with each antenna to the wireless device of communication object; Select in a plurality of antennas at least one antenna that when the data that receive from the wireless device of communication object, should use, but also at least one antenna transmission known signal corresponding with each antenna from selecting.
Other kind of another kind attitude of the present invention also is a sending method.This method possesses: by at least one antenna in a plurality of antennas, to the step of the corresponding data of wireless device transmission and each antenna of the communication object corresponding with the variable data transfer rate; Generation this wireless device is provided be suitable for and the wireless device of communication object between the step of request signal of information of data transmission rate of wireless transmission link.Forwarding step when the request signal that generates is sent as data, also from comprising a plurality of antennas for the antenna beyond at least one antenna that sends data, sends each the corresponding known signal with a plurality of antennas.
Forwarding step also can be when sending request signal, at least to each corresponding known signals of a plurality of antennas, carry out beam-shaping.Also possesses in a plurality of antennas the step of at least one antenna that selective reception should be used when from the data of the wireless device of communication object; Forwarding step can send known signal from the antenna of selecting.Also possess and utilize a plurality of antennas, receive the step of the known signal of usefulness from the wireless device of communication object; The step of selecting can be according to the known signal that receives, and derives each the corresponding radio quality with a plurality of antennas, preferentially selects the good antenna of radio quality.
Can also possess and utilize a plurality of antennas, receive the step of the known signal of usefulness from the wireless device of communication object; With in a plurality of antennas, selection should be sent the step of at least one antenna of known signal.The step of selecting can be according to the known signal of the reception usefulness that receives, and derives each the corresponding radio quality with a plurality of antennas, preferentially selects the good antenna of radio quality.
Other kind of another kind attitude of the present invention also is a sending method.This method possesses: from a plurality of antennas, and the step of at least one antenna that selective reception should be used when from the data of the wireless device of communication object; The antenna that comprises from least one antenna of selecting sends the data corresponding with each antenna to the wireless device of communication object, but also from the step of at least one antenna transmission of selection known signal corresponding with each antenna.
In forwarding step, also possess the burst signal that generation should be sent, and comprise the step of the data transmission rate of the data that step and the decision of the burst signal of known signal and data comprised by the burst signal that in generating step, generates; In generating step, at least one in data and the antenna that should send known signal be at once, the quantity that increase should corresponding antenna, thus make these data corresponding with the antenna that should send known signal; In deciding step, the antenna that in generating step, makes data and should send known signal gives the antenna decision that send known signal than making the data correspondence low data transmission rate of data transmission rate in the past at once.Generate step for known signal and data; Use a plurality of subcarriers; With each of a plurality of antennas as unit; Change the combination of each subcarrier that should use of known signal, and when making data and the antenna that should send known signal is corresponding, use is from the combination of the subcarrier of the known signal of the antenna transmission identical with data in these data.
Also possess and be created on the burst signal that should send in the forwarding step, and comprise the step of the burst signal of known signal and data; The generation step comprises: data with should send in the antenna of known signal at least one at once, the quantity that increase should corresponding antenna, thus make these data step corresponding with the antenna that should send known signal; For known signal and data; Use a plurality of subcarriers; With each of a plurality of antennas as unit; Change the combination of each subcarrier that should use of known signal, and when making data and the antenna that should send known signal is corresponding, use is from the combination of the subcarrier of the known signal of the antenna transmission identical with data in these data.
Other kind of another kind attitude of the present invention is a method of reseptance.This method is the method for reseptance that receives by the data of the variable data transfer rate of at least one antenna transmission in a plurality of antennas and data corresponding with each antenna; According to by comprise for the known signal of a plurality of antenna transmission of the antenna beyond at least one antenna of sending data and also with each corresponding known signals of a plurality of antennas; Calculate corresponding with a plurality of antennas respectively reception answer vector; According to the reception answer vector of calculating; Calculate the correlation between corresponding with a plurality of antennas respectively reception answer vector, according to correlation, the data transmission rate of decision for data.
Other kind of another kind attitude of the present invention also is a method of reseptance.This method is the method for reseptance that receives by the data of the variable data transfer rate of at least one antenna transmission in a plurality of antennas and data corresponding with each antenna; According to by comprise for the known signal of a plurality of antenna transmission of the antenna beyond at least one antenna of sending data and also with each corresponding known signals of a plurality of antennas; Calculate corresponding with a plurality of antennas respectively reception answer vector; According to the reception answer vector of calculating; Calculate the power ratio between corresponding with a plurality of antennas respectively reception answer vector, according to power ratio, the data transmission rate of decision for data.
Other kind attitude of the present invention also is a method of reseptance.This method is the method for reseptance that receives by the data of the variable data transfer rate of at least one antenna transmission in a plurality of antennas and data corresponding with each antenna, possesses: receive by comprise for the known signal of a plurality of antenna transmission of at least one antenna antenna in addition of sending data and also with the step of each corresponding known signals of a plurality of antennas; According to the known signal that receives, calculate the step of the reception answer vector corresponding with each a plurality of antennas difference; According to the reception answer vector of calculating, calculate the step of the correlation between the reception answer vector corresponding with a plurality of antennas difference; According to the correlation of calculating, decision is as far as the step of the data transmission rate of data.
Other kind attitude of the present invention also is a method of reseptance.This method is the method for reseptance that receives by the data of the variable data transfer rate of at least one antenna transmission in a plurality of antennas and data corresponding with each antenna, possesses: receive by comprise for the known signal of a plurality of antenna transmission of at least one antenna antenna in addition of sending data and also with the step of each corresponding known signals of a plurality of antennas; According to the known signal that receives, calculate the step of the reception answer vector corresponding with each a plurality of antennas difference; According to the reception answer vector of calculating, calculate the step of the power ratio between the reception answer vector corresponding with a plurality of antennas difference; According to the power ratio of calculating, decision is as far as the step of the data transmission rate of data.
The known signal that in receiving step, receives uses a plurality of carrier waves; Deciding step can be according to some states of a plurality of carrier waves, and decision is as far as the data transmission rate of data.Receiving step when receiving known signal, also receives the request about the information of data transmission rate, as for the replying of the request that receives, can also possess the step of the data transmission rate that determines in the notice deciding step.
Other kind of another kind attitude of the present invention also is a sending method.This method send comprise with a plurality of antennas at least one antenna each the 1st corresponding known signal, with comprise each the 2nd corresponding known signal for a plurality of antennas of at least one antenna antenna in addition of sending the 1st known signal, with burst signal for each corresponding data of at least one antenna of sending the 1st known signal.
Other kind of another kind attitude of the present invention also is a sending method.This method possesses: generate with a plurality of antennas at least one antenna each the 1st corresponding known signal, with comprise each the 2nd corresponding known signal for a plurality of antennas of at least one antenna antenna in addition of sending the 1st known signal, with step for the burst signal of each corresponding data of at least one antenna of sending the 1st known signal; Do media through a plurality of antennas, be sent in the step that generates the burst signal that generates in the step.
Generate step, can make in the 2nd known signal with for the corresponding part of at least one antenna of sending the 1st known signal and with at least one antenna corresponding part of antenna in addition in order to send the 1st known signal, be configured in the different moment.Generate step the quantity of the antenna that should send the 1st known signal is increased to till the quantity of the antenna that send the 2nd known signal, cut apart and each the corresponding data that increases preceding antenna, make the data of cutting apart corresponding with the antenna of increase.Generate step, can use a plurality of subcarriers, generate the data that comprised by burst signal, subcarrier as unit, is carried out cutting apart of data.
The step that generates; The quantity of the antenna that should send the 1st known signal is increased to till the quantity of the antenna that send the 2nd known signal; To be divided on one side the number of the antenna of increase with each corresponding data of antenna before increasing, each that makes data of cutting apart and the antenna that should send the 2nd known signal is corresponding.Generate step; At least for the 2nd known signal and data; Use a plurality of subcarriers, the antenna that should send the 2nd known signal changes the combination of each subcarrier that should use of the 2nd known signal as unit; And when making each of data of cutting apart and the antenna that should send the 2nd known signal corresponding, in these data, use from the combination of the subcarrier of the 2nd known signal of the antenna transmission identical with data.
The step that also possesses the data transmission rate of the data that decision comprised by the burst signal that in generating step, generates; In deciding step; Data transmission rate in the time of can being increased to the quantity that in generating step, makes the antenna that send the 1st known signal till the quantity of the antenna that should send the 2nd known signal, the data transmission rate when being lower than till the quantity that the quantity that in generating step, does not make the antenna that send the 1st known signal is increased to the antenna that send the 2nd known signal.
Other kind of another kind attitude of the present invention also is a sending method.This method possesses: send the step of burst signal from each of a plurality of antennas; Be created on the burst signal that should send in the forwarding step and comprise with each corresponding known signals of a plurality of antennas and be configured in the step of burst signal of data of the back level of known signal; The step of the data transmission rate of the data that the burst signal that the decision quilt generates in generating step comprises.In generating step, at least one antenna in data and a plurality of antenna is at once, make should corresponding antenna the quantity increase, thereby make these data corresponding with a plurality of antennas; In deciding step, in generating step, make data and a plurality of antenna at once, determine to become to be lower than to make the data transmission rate of the corresponding data transmission rate in the past of data with a plurality of antennas.
Generate step; For known signal and data; Use a plurality of subcarriers, each of a plurality of subcarriers as unit, is changed the combination of each subcarrier that should use of known signal; And when making data and a plurality of antennas are corresponding, can in these data, use from the combination of the subcarrier of the known signal of the antenna transmission identical with data.
Other kind of another kind attitude of the present invention also is a sending method.This method possesses: send the step of burst signal from each of a plurality of antennas; Be created on the burst signal that should send in the forwarding step and comprise with each corresponding known signals of a plurality of antennas and be configured in the step of burst signal of data of the back level of known signal.The generation step comprises: at least one antenna in data and a plurality of antenna is at once, make should corresponding antenna quantity increase, thereby make these data step corresponding with a plurality of antennas; For known signal and data; Use a plurality of subcarriers; With each of a plurality of antennas as unit; Change the combination of each subcarrier that should use of known signal, and when making data and a plurality of antennas are corresponding, use is from the step of the combination of the subcarrier of the known signal of the antenna transmission identical with data in these data.
Other kind of another kind attitude of the present invention also is a wireless device.This device possesses: generation portion, this generation portion generate and comprise respectively by the 1st known signal of a plurality of array configuration and the 2nd known signal, by the burst signal of a plurality of series of the data of at least one configuration in a plurality of series; Variant part; This variant part comprises the quadrature ranks multiply by the 2nd known signal and data in the burst signal of a plurality of series that generate in the generation portion respectively; Thereby generate the unit of the data till the 2nd known signal and the quantity that is increased to a plurality of series after multiplying each other with the quadrature ranks; Each time corresponding displacement with utilization and a plurality of series; To carry out as serial unit in the circulative time shifting in the 2nd known signal that multiplies each other with the quadrature ranks, the circulative time shifting in the data till being increased to the quantity of a plurality of series will be carried out as serial unit, make the unit of the burst signal distortion of a plurality of series; Efferent, the burst signal of a plurality of series that this efferent output is out of shape in variant part.The 1st known signal that the burst signal of a plurality of series that in generation portion, generate comprises, the cycle with regulation; In each time corresponding displacement variant part and a plurality of series at least one had at the 1st known signal more than the cycle of regulation.
After adopting this kind attitude; Even the quantity of the series of data is less than the quantity of the series of the 2nd known signal; Also because carrying out the computing and the circulative time shifting of multiplying each other with the quadrature ranks handles, so can make the quantity of series of data consistent with the quantity of the series of the 2nd known signal.In addition, also because in the 2nd known signal, carry out and the same processing of DS,, use the 2nd known signal so can make the wireless device that becomes communication object when receiving data.In addition, because in the 1st known signal, do not carry out the processing same,, can improve the receiving feature in the wireless device that becomes communication object so can increase the time shifting amount with DS.
Other kind of another kind attitude of the present invention also is a sending method.This method possesses: the quadrature ranks multiply by respectively comprise respectively by the 1st known signal of a plurality of array configuration and the 2nd known signal and by the 2nd known signal and data in the burst signal of a plurality of series of the data of at least one configuration in a plurality of series, thereby generate the step of the data till the 2nd known signal that multiplies each other with the quadrature ranks and the quantity that is increased to a plurality of series; Utilize each time corresponding displacement with a plurality of series; In serial unit, carry out the circulative time shifting in the 2nd known signal that multiplies each other with the quadrature ranks, in serial unit, carry out the step of the circulative time shifting in the data till the quantity that is being increased to a plurality of series; Output comprises the 2nd known signal and the data of having carried out circulative time shifting, thus the step of the burst signal of a plurality of series of distortion.Generate the 1st known signal that comprises in the step, cycle with regulation; In in the step of carrying out and each time corresponding displacement a plurality of series at least one had at the 1st known signal more than the cycle of regulation.
Generate step,, use a plurality of subcarriers for the burst signal of a plurality of series each; By the 2nd known signal of a plurality of array configuration, can use different subcarriers respectively for each series.The output step can make the burst signal of a plurality of series of distortion corresponding with a plurality of antennas on one side, and export on one side.
Other kind of another kind attitude of the present invention also is a wireless device.This device possesses: efferent, this efferent are to the wireless device of the communication object corresponding with the variable data transfer rate, and output is at least by the data of an array configuration; Control part, this control part generate this wireless device is provided be suitable for and the wireless device of communication object between the request signal of information of data transmission rate of wireless transmission link, the request signal that generates as data, is exported by efferent.Efferent also from comprising a plurality of series at least one series beyond the series of sending data, is exported each the corresponding known signal with a plurality of series when the output request signal.
After adopting this appearance attitude; Because when the wireless device output request signal of communication object; Also export by the known signal of a plurality of array configuration; So can obtain the information of newly-generated data transmission rate according to the information and the known signal of the data transmission rate in the wireless device of communication object, improve the precision of information.
Other kind of another kind attitude of the present invention also is a wireless device.This device possesses: generation portion, this generation portion generate and comprise by the 1st known signal of at least one configuration in a plurality of series, by the burst signal of the data of the 2nd known signal of each configuration in a plurality of series, quilt and the same array configuration of the 1st known signal; Efferent, the burst signal that this efferent output generates in generation portion.
After adopting this kind attitude because make the 1st known signal with should configuration data serial identical, so the recipient can use the result that infers according to the 1st known signal in receiving data, can improve the characteristic that receives data.
Also possesses determination section, the data transmission rate of the data that comprised by burst signal that this determination section decision generates in generation portion; In determination section; Data transmission rate in the time of can making the quantity of the series that dispose the 1st known signal be increased to till the quantity of a plurality of series generation portion, the data transmission rate when determining to become to be lower than till the quantity that quantity that generation portion do not make the series that dispose the 1st known signal is increased to a plurality of series.
Other kind of another kind attitude of the present invention also is a wireless device.This device possesses: efferent, and this efferent is exported the burst signal of a plurality of series; Generation portion, this generation portion generate and by the burst signal of efferent output and comprise by the known signal of each configuration of a plurality of series and be configured in the burst signal of data of the back level of known signal; Determination section, the data transmission rate of the data that the burst signal that this determination section decision is generated in generation portion comprises.Generation portion, is increased the quantity of the series that dispose, thereby makes these data of a plurality of array configuration by at least one when configuration in a plurality of series in data; When determination section makes a plurality of array configuration data in generation portion, determine than the low data transmission rate of data transmission rate that makes before a plurality of array configuration data.
After adopting this kind attitude, when making each configuration data of a plurality of series,, also can reduce the generation of the mistake of data through reducing data transmission rate even when being not suitable for the transmission of data from the wireless transmission link characteristic of the series that is configured.
Generation portion; To known signal and data; Use a plurality of subcarriers, each of a plurality of series as unit, is changed the combination of each subcarrier that should use of known signal; And when making a plurality of array configuration data, can in these data, use the combination of the subcarrier in quilt and the known signal that sends the same array configuration of data.
Other kind of another kind attitude of the present invention also is a wireless device.This device possesses: efferent, and this efferent is exported the burst signal of a plurality of series; Generation portion, this generation portion generate that comprise should be by the burst signal of efferent output and by the known signal of each configuration of a plurality of series be configured in the burst signal of data of the back level of known signal.Generation portion; When being included in data, the quantity of the series that should dispose being increased, thereby make the unit of this data configuration in a plurality of series by at least one configuration in a plurality of series; With for known signal and data; Use a plurality of subcarriers, each of a plurality of series as unit, is changed the combination of each subcarrier that should use of known signal; And when making said data configuration arrive a plurality of series, the unit of the combination of the subcarrier of the known signal of use quilt and the same array configuration of data in these data.
After adopting this kind attitude, when making a plurality of array configuration data,, use identical subcarrier, thereby be easy to select the subcarrier that should use data separately for by the known signal of an array configuration and data.
Other kind of another kind attitude of the present invention also is a sending method.This method possesses: to the wireless device of the communication object corresponding with the variable data transfer rate, export at least by the step of the data of 1 array configuration; Generation be intended to make this wireless device provide about be suitable for and the wireless device of communication object between the request signal of information of data transmission rate of wireless transmission link, and as the step of data by the request signal of output step output.The output step is when the output request signal, and also from comprising a plurality of series at least one series beyond the series of dateout, output is by the known signal of each configuration of a plurality of series.
Other kind of another kind attitude of the present invention also is a sending method.This method possesses: generation comprises by the 1st known signal of at least one configuration in a plurality of series, by the step of the burst signal of the data of the 2nd known signal of each configuration in a plurality of series, quilt and the same array configuration of the 1st known signal; The step of the burst signal that output generates.
Other kind of another kind attitude of the present invention also is a sending method.This method possesses: the step of exporting the burst signal of a plurality of series; The burst signal that generation should be exported in the step in output and comprise by the known signal of each configuration of a plurality of series and be configured in the step of burst signal of data of the back level of known signal.The generation step comprises: by at least one when configuration in a plurality of series, the quantity of the series that should dispose is increased in data, thereby make the step of a plurality of these data of array configuration; For known signal and data; Use a plurality of subcarriers; With each of a plurality of series as unit; Change the combination of each subcarrier that should use of known signal, and when making a plurality of array configuration data, the step of the combination of the subcarrier of the known signal of the array configuration that the use quilt is identical with data in these data.
Also possess according to the signal that utilizes a plurality of antennas to receive, set at least one step of a plurality of antennas of being intended to send data from the wireless device of communication object; Forwarding step as at least one the antenna that should send data, can use at least one the antenna of in setting step, setting.Also possess the signal that receives from the wireless device of communication object according at least one antenna that utilizes in a plurality of antennas, set the step of at least one antenna in the antenna that is intended to send at least one antenna of data and in selecting step, selects; Forwarding step as at least one the antenna that should send data, can use at least one the antenna of in setting step, setting.
Also possess according to the signal that utilizes a plurality of antennas to receive, set the step of at least one antenna that is intended to send data from the wireless device of communication object; Generate step,, can use at least one antenna of in setting step, setting as making at least one corresponding antenna of data.Also possess each of a plurality of series of exporting in the step in output, corresponding with each of a plurality of antennas, and, set the step of at least one antenna that is intended to dateout according to the signal that the wireless device that utilizes a plurality of antennas from communication object receives; The output step as at least one series that should dateout, can be used and the corresponding series of in the setting step, setting of at least one antenna.
Each of a plurality of series of output step output, corresponding with each of a plurality of antennas, but also possess the signal that receives according to the wireless device that utilizes a plurality of antennas from communication object, set the step of at least one antenna that is intended to dateout; Generate step,, can use and the corresponding series of in the setting step, setting of at least one antenna as at least one series that should configuration data.Also possess the burst signal that generation should send and comprise known signal and the step of the burst signal of data in forwarding step; In generating step; Data with should send at least one antenna in the antenna of known signal at once; Can with in the known signal by the amplitude of the signal of the part of the antenna transmission beyond the antenna that should send data, be specified to less than in the known signal by the value of the amplitude of the signal of the part of the antenna transmission that should send data.
In generating step, can also with in the 2nd known signal by the amplitude of the signal of the part of the antenna transmission beyond the antenna that should send data, be specified to less than in the 2nd known signal by the value of the amplitude of the signal of the part of the antenna transmission that should send data.In generating step, can also with in the 2nd known signal by the amplitude of the signal of the part of array configuration that should be beyond the series of configuration data, be specified to less than in the 2nd known signal by the value of the amplitude of the signal of the part of array configuration that should configuration data.And then possess the burst signal that generation should export in the step in output and comprise known signal and the step of the burst signal of data; In generating step; When data should be disposed at least one configuration in the series of known signal; With in the known signal by the amplitude of the signal of the part of the array configuration beyond the series that should configuration data, be specified to less than in the known signal by the value of the amplitude of the signal of the part of array configuration that should configuration data.
Also possess the burst signal that generation should send and comprise known signal and the step of the burst signal of data in forwarding step; In generating step; Data with should send at least one antenna in the antenna of known signal at once; Can the quantity of the subcarrier that uses in the part by the antenna transmission beyond the antenna that should send data in the known signal be specified to the value less than the quantity of the subcarrier that uses in the part by the antenna transmission that should send data in the known signal.In generating step; Can the quantity of the subcarrier that uses in the part by the antenna transmission beyond the antenna that should send data in the 2nd known signal be specified to the value less than the quantity of the subcarrier that uses in the part by the antenna transmission that should send data in the 2nd known signal.
In generating step; Can also be with in the 2nd known signal; The quantity of the subcarrier that in by the part of the array configuration beyond the series that should configuration data, uses; Be specified to than in the 2nd known signal little value of quantity of the subcarrier that in by the part of array configuration that should configuration data, uses.Also possess and generate the burst signal that the output step should export and comprise known signal and the step of the burst signal of data; In generating step; When data should be disposed at least one configuration in the series of known signal; Can be with in the known signal; The quantity of the subcarrier that in by the part of the array configuration beyond the series that should configuration data, uses is specified to than in the known signal, the little value of quantity of the subcarrier that in by the part of array configuration that should configuration data, uses.
Also possess according to using a plurality of antennas,, set configuration part at least one antenna that sends data from the signal that the wireless device of communication object receives; As should make data corresponding at least one antenna, generation portion can use at least one antenna of setting in the configuration part.By each of a plurality of series of efferent output, corresponding with each of a plurality of antennas, but also possess according to using a plurality of antennas, from the signal that the wireless device of communication object receives, set configuration part at least one antenna of dateout; As at least one series that should configuration data, generation portion can use with the configuration part in the corresponding series of at least one antenna set.
In generation portion, can also be with in the 2nd known signal, should be sent the amplitude of signal of the part of the antenna transmission beyond the antenna of data, be specified to less than in the 2nd known signal, should be sent the value of amplitude of signal of part of the antenna transmission of data.In generation portion; Can also be with in the 2nd known signal; Amplitude by the signal of the part of the array configuration beyond the series that should configuration data is specified to than in the 2nd known signal, by the little value of amplitude of the signal in the part of array configuration that should configuration data.
In generation portion; Can also be with in the 2nd known signal; Should be sent the quantity of the subcarrier that uses in the part of the antenna transmission beyond the antenna of data, be specified to, should be sent the little value of quantity of the subcarrier that uses in the part of antenna transmission of data than in the 2nd known signal.In generation portion; Can also be with in the 2nd known signal; Quantity by the subcarrier that uses in the part of the array configuration beyond the series that should configuration data is specified to than in the 2nd known signal, the little value of quantity of the subcarrier that in by the part of array configuration that should configuration data, uses.
Other kind attitude of the present invention also is a wireless device.This device possesses: acceptance division, this acceptance division receive by the 1st known signal of at least one configuration in a plurality of series, by the 2nd known signal of each configuration in a plurality of series, comprise by with the burst signal of the data of the same array configuration of the 1st known signal; Handling part, this handling part is handled the burst signal that acceptance division receives.Acceptance division makes the part of the array configuration beyond the series that is configured the 1st known signal in part and the 2nd known signal of the array configuration that is configured the 1st known signal in the 2nd known signal, in different moment configurations.
Acceptance division can be according to the 1st known signal; Set the gain of AGC; Again according to this gain, receive the part of the array configuration beyond the series that is configured the 1st known signal in part and the 2nd known signal of the array configuration that is configured the 1st known signal in the 2nd known signal respectively.Handling part can be carried out independently action to each of a plurality of series.
Also possess according to the signal that utilizes a plurality of antennas to receive, set at least one step of a plurality of antennas of being intended to send data from the wireless device of communication object; As at least one the antenna that should send data, sending part can use at least one the antenna of in the configuration part, setting.Also possess the signal that receives from the wireless device of communication object according at least one antenna that utilizes in a plurality of antennas, set the configuration part of at least one antenna in the antenna that is intended to send at least one antenna of data and in selection portion, selects; As at least one the antenna that should send data, sending part can use at least one the antenna of in the configuration part, setting.By each of a plurality of series of efferent output, corresponding with each of a plurality of antennas, but also possess according to using a plurality of antennas, from the signal that the wireless device of communication object receives, set configuration part at least one antenna of dateout; As at least one series that should dateout, generation portion can use with the configuration part in the corresponding series of at least one antenna set.
Also possess generation portion, this generation portion generates the burst signal that sent by sending part, and comprises the burst signal of known signal and data; In generation portion; Can data with should send in the antenna of known signal at least one at once; In known signal; Should be sent the amplitude of signal of the part of the antenna transmission beyond the antenna of data, be specified to, should be sent the value of amplitude of signal of part of the antenna transmission of data less than in the known signal.Also possess generation portion, this generation portion generates should be by the burst signal of efferent output, and comprises the burst signal of known signal and data; In generation portion; Can also be when data should be disposed at least one configuration in the series of known signal; In known signal; Amplitude by the signal of the part of the array configuration beyond the series that should configuration data is specified to than in the known signal, by the little value of amplitude of the signal in the part of array configuration that should configuration data.In the quantity of the subcarrier that uses, be specified to than in the 2nd known signal, should be sent the little value of quantity of the subcarrier that uses in the part of antenna transmission of data.In generation portion; Can also be with in the 2nd known signal; Quantity by the subcarrier that uses in the part of the array configuration beyond the series that should configuration data is specified to than in the 2nd known signal, the little value of quantity of the subcarrier that in by the part of array configuration that should configuration data, uses.
Also possess generation portion, this generation portion generates the burst signal that sent by sending part, and comprises the burst signal of known signal and data; In generation portion; Can data with should send in the antenna of known signal at least one at once; In known signal; Should be sent the quantity of the subcarrier that uses in the part of the antenna transmission beyond the antenna of data, be specified to, should be sent the little value of quantity of the subcarrier that uses in the part of antenna transmission of data than in the known signal.Also possess generation portion, this generation portion generates should be by the burst signal of efferent output, and comprises the burst signal of known signal and data; In generation portion; Can also be when data should be disposed at least one configuration in the series of known signal; In known signal; The quantity of the subcarrier that in by the part of the array configuration beyond the series that should configuration data, uses is specified to than in the known signal, the little value of quantity of the subcarrier that in by the part of array configuration that should configuration data, uses.
In addition, the combination arbitrarily of above inscape, conversion performance of the present invention between method, device, system, recording medium, computer program etc. is as appearance attitude of the present invention, also all very effectively.
After adopting the present invention, can improve the precision of the control when the transmission data.
Description of drawings
Fig. 1 is the figure of the vector of the multi-carrier signal that relates to of expression embodiments of the invention 1.
Fig. 2 is the figure of the structure of the communication system that relates to of expression embodiments of the invention.
Fig. 3 (a)-(b) is the figure of structure of burst format of the communication system of presentation graphs 2.
Fig. 4 is the sequential chart of the communication steps that becomes comparison other of the communication system of presentation graphs 2.
Fig. 5 is the sequential chart of other communication steps that becomes comparison other of the communication system of presentation graphs 2.
Fig. 6 is the figure of structure of the 1st wireless device of presentation graphs 2.
Fig. 7 is the figure of the structure of the frequency field signal in the presentation graphs 6.
Fig. 8 is the figure of structure of the 1st handling part of presentation graphs 6.
Fig. 9 is the sequential chart of the step of the setting data transfer rate in the communication system of presentation graphs 2.
Figure 10 is the flow chart of other step of the setting data transfer rate in the 1st wireless device of presentation graphs 6.
Figure 11 is the sequential chart of other step of the setting data transfer rate in the communication system of presentation graphs 2.
Figure 12 is the flow chart of other step of the setting data transfer rate in the 1st wireless device of presentation graphs 6.
Figure 13 is the sequential chart of the communication steps in the communication system of presentation graphs 2.
Figure 14 is the flow chart of forwarding step of the 2nd wireless device of expression Figure 13.
Figure 15 is the sequential chart of another other step of the setting data transfer rate in the communication system of presentation graphs 2.
Figure 17 is the figure of structure of the control part of presentation graphs 6.
Figure 18 representes the figure of the structure of the determinating reference that the memory portion of Figure 17 is remembered.
The figure of other structure of the burst format of the communication system of Figure 19 (a)-(b) presentation graphs 2.
The figure of another other structure of the burst format of the communication system of Figure 20 presentation graphs 2.
Figure 21 (a)-(d) expression make Figure 20 the burst format distortion the figure of burst format structure.
Figure 23 is the flow chart of the expression forwarding step corresponding with the burst format of Figure 22 (a)-(b).
Figure 24 is the flow chart of expression other forwarding step corresponding with the burst format of Figure 22 (a)-(b).
Figure 25 is the figure of the structure of the dispensing device that relates to of expression embodiments of the invention 2.
Figure 26 (a)-(b) is the figure of the burst format of the burst signal that generates in the dispensing device of expression Figure 25.
Figure 27 is the figure of the structure of the burst format that relates to of expression embodiments of the invention 3.
Among the figure:
10-wireless device, 12-antenna, 14-antenna, 20-radio section, 22-handling part, 24-department of modulation and demodulation, 26-IF portion, 28-selection portion, 30-control part, 32-transfer rate Information Management Department, 40-FFT portion, the synthetic portion of 42-, 44-contrast signal generation portion, 46-separated part, 48-IFFT portion, 50-lead code appendix, 52-transmission route vector calculation portion, 54-receive weight vector calculating part, 56-multiplier, 58-multiplier, 60-addition portion, 100-communication system.
Embodiment
(embodiment 1)
Before specifically telling about the present invention, tell about its summary.Embodiments of the invention 1 relate to the mimo system that is made up of 2 wireless devices (below, for convenience's sake, be called " the 1st wireless device " and " the 2nd wireless device ").The 1st wireless device in the mimo system and the 2nd wireless device are all carried out adaptive array signal and are handled.In addition, the value of the encode rate of the radical of mimo system through changing antenna, modulation system, error correction, change data transmission rate.At this moment, the wireless device of transmitter side is to the wireless device transmission transfer rate request signal of receiver side.For example: when the 1st wireless device sent data to the 2nd wireless device, the 1st wireless device sent the transfer rate request signal to the 2nd wireless device.
The 2nd wireless device is notified the transfer rate information of the 1st wireless device oneself, but this transfer rate information, but following the fashionable mistake that comprises.Need the situation during certain after the first, the 2 wireless device decision transfer rate information.The second, when being the 2nd wireless device decision transfer rate information during with the data that receive from the 1st wireless device, the radical condition of different of sending the antenna of the 1st wireless device that uses.In addition, these particular contents will be told about at the back literary composition.The 1st wireless device that present embodiment relates to becomes proper data in order to make the transfer rate information that obtains from the 2nd wireless device, when sending the transfer rate request signal, and also additional training signal.Its result, the 2nd wireless device is because can upgrade transfer rate information according to training signal, so transfer rate information can be correct.
In addition, when the 2nd wireless device sent data, the 1st wireless device must be derived the transmission route vector in advance according to training signal by the 1st wireless device.Therefore, the 1st wireless device request the 2nd wireless device sends training signal (the following signal that will send for this request is called " train request signal ").The 2nd wireless device sends training signal according to the train request signal to the 1st wireless device.At this moment, in order to reduce power consumption, not from all antenna transmission training signals, but from receiving the antenna transmission training signal of data from the 1st wireless device.
Fig. 1 is the vector of the multi-carrier signal that relates to of expression embodiments of the invention 1.Fig. 1 representes the vector of the signal in the OFDM modulation system especially.Usually with one of a plurality of carrier waves in the OFDM modulation system, be called " subcarrier ".Adopt " subcarrier number " to specify a number of sub-carrier here.Therefore, the same with the IEEE802.11a standard, stipulated 53 number of sub-carrier of subcarrier number " 26 "～" 26 ".In addition, subcarrier number " 0 " is to set zero for for the influence that reduces the flip-flop in the burst signal.Subcarrier is separately modulated by the modulation system of variable setting.In modulation system, use some among BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), the 64QAM.
In addition, in these signals,, use convolutional codeization as error correcting system.The encode rate of convolutional codeization sets 1/2,3/4 etc. for.And then the radical of the antenna that in mimo system, uses is set changeably.Its result, after the value of the radical of modulation system, encode rate, antenna was set changeably, data transmission rate was also set changeably.Below, as previously mentioned, will being called " transfer rate information " about the information of data transmission rate, transfer rate information comprises the value of the radical of modulation system, encode rate, antenna.Only if need particularly point out, just do not tell about the value separately of the radical of modulation system, encode rate, antenna here.
Fig. 2 representes the structure of the communication system 100 that embodiments of the invention relate to.Communication system 100 comprises the 1st wireless device 10a, the 2nd wireless device 10b that are collectively referred to as " wireless device 10 ".In addition, the 1st wireless device 10a comprises the 1st antenna 12a, the 2nd antenna 12b, the 3rd antenna 12c, the 4th antenna 12d that is collectively referred to as " antenna 12 "; The 2nd wireless device 10b comprises the 1st antenna 14a, the 2nd antenna 14b, the 3rd antenna 14c, the 4th antenna 14d that is collectively referred to as " antenna 14 ".Among the 1st wireless device 10a and the 2nd wireless device 10b one, corresponding with base station apparatus, another is corresponding with receiving system.In addition, among the 1st wireless device 10a and the 2nd wireless device 10b one, corresponding with dispensing device, another is corresponding with terminal installation.
Before the structure of telling about communication system 100, tell about the summary of mimo system.Tentation data sends to the 2nd wireless device 10b by the 1st wireless device 10a.The 1st wireless device 10a sends different data from each of the 1st antenna 12a～the 4th antenna 12d.Its result, data transmission rate become at a high speed.The 2nd wireless device 10b utilizes the 1st antenna 14a～the 4th antenna 14d to receive data.And then the 2nd wireless device 10b handles through adaptive array signal, separates the data that receive, separately the data of each transmission of demodulation the 1st antenna 12a～the 4th antenna 12d.
Here, because the radical of antenna 12 is " 4 ", the radical of antenna 14 also is " 4 ", so the combination of the transmission line between antenna 12 and the antenna 14 just becomes " 16 ".To be expressed as hij from i antenna 12i to the transmission line property the j antenna 14j.In the drawings, the transmission line property with between the 1st antenna 12a and the 1st antenna 14a is expressed as h11; Transmission line property with between the 1st antenna 12a and the 2nd antenna 14b is expressed as h12; Transmission line property with between the 2nd antenna 12b and the 1st antenna 14a is expressed as h21; Transmission line property with between the 2nd antenna 12b and the 2nd antenna 14b is expressed as h22; Transmission line property with between the 4th antenna 12d and the 4th antenna 14d is expressed as h44.In addition, the transmission line beyond their, short and sweet and be omitted in order to make drawing.
After the 2nd wireless device 10b handles through adaptive array signal, can be to the data demodulation ground action independently that the 1st antenna 12a～the 2nd antenna 12b sends respectively.And then the 1st wireless device 10a also carries out adaptive array signal to the 1st antenna 12a～the 4th antenna 12d and handles.Like this, in the 1st wireless device 10a of transmitter side, also carry out adaptive array signal and handle, thereby cut apart the space in the mimo system conscientiously.Its result is because the interference between the signal that in a plurality of antennas 12, sends diminishes, so can improve the transmission characteristic of data.
The 1st wireless device 10a sends mutually different data from the 1st antenna 12a～the 4th antenna 12d.In addition, according to the transfer rate and the capacity of the data that should send, the radical of the antenna 12 that the 1st wireless device 10a control should be used.For example: when the capacity of the data that should send is big, use " 4 " root antenna 12; The capacity of the data that should send hour uses " 2 " root antenna 12.In addition, when the radical of the antenna 12 that the 1st wireless device 10a decision should be used, with reference to the transfer rate information among the 2nd wireless device 10b.For example: when the 2nd wireless device 10b instruction received with " 2 " root antenna 14, the 1st wireless device 10a used " 2 " root antenna 12.And then the 1st wireless device 10a carries out adaptive array signal to antenna 12 and handles when sending data.Therefore, the 1st wireless device 10a receives training signal from the 2nd wireless device 10b in advance, according to training signal, derives the transmission route vector.State after the detailed content.
The 2nd wireless device 10b carries out adaptive array signal to the 1st antenna 12a～the 4th antenna 12d and handles, and receives the data from the 1st wireless device 10a.In addition, as previously mentioned, the 2nd wireless device 10b notifies the 1st wireless device 10a transfer rate information, perhaps sends training signal to it.In addition, the action of the 1st wireless device 10a and the 2nd wireless device 10b, good on the contrary.
The structure of the burst format of Fig. 3 (a)-(b) expression communication system 100.Burst format when the radical of the antenna 12 that Fig. 3 (a) is to use is " 2 ".The epimere of figure is represented the burst signal that the 1st antenna 12a sends; The hypomere of figure is represented the burst signal that the 2nd antenna 12b sends." Legacy STS (Short Training Sequence) ", " Legacy LTS (Long Trainig Sequence) ", " Legacy STS ", " Legacy signal "; As abideing by the WLAN of IEEE802.11a standard, be the signal that has interchangeability with not corresponding communication system with MIMO." Legacy STS " regularly reached AGC uses such as (Automatic Gain Control) synchronously, and " Legacy LTS " is transmitted circuit and infers use, and " Legacy signal " comprises control information.After " MIMO signal ", be the distinctive signal of mimo system, " MIMO signal " comprises and the mimo system control information corresponding." 1MIMO-STS " and " 2MIMO-STS " are regularly reached uses such as AGC synchronously; " 1MIMO-LTS " and " 2MIMO-LTS " are transmitted circuit and infer use; " the 1st data " and " the 2nd data " are the data that send.
Fig. 3 (b) is the same with Fig. 3 (a), is the burst format when using " 2 " root antenna 12 in order to send data.But the training signal that additional preamble is told about.Among the figure, training signal and " 1MIMO-STS ", " 1MIMO-LTS "～" 4MIMO-STS ", " 4MIMO-LTS " are corresponding.In addition, " 1MIMO-STS ", " 1MIMO-LTS "～" 4MIMO-STS ", " 4MIMO-LTS " are sent by the 1st antenna 12a～the 4th antenna 12d respectively.In addition, as previously mentioned, the radical that sends the antenna 12a of training signal can be less than " 4 "." 1MIMO-STS "～" 4MIMO-STS ", the directional diagram less by mutual interference constitutes." 1MIMO-LTS "～" 4MIMO-LTS " too.Omit telling about here, to these structures.In general, " 1MIMO-LTS " among " Legacy LTS " and Fig. 3 (a) etc. are known as training signal sometimes.But training signal is defined as the signal of foregoing Fig. 3 (b) here.In other words, so-called " training signal " is equivalent to carry out that transmission lines are inferred and promptly the number of series is irrelevant with the number of the data that should send for the wireless device 10 that makes communication object, only the MIMO-LTS of the number of the series corresponding with the transmission line that should infer.Below, " 1MIMO-STS "～" 4MIMO-STS " is referred to as " MIMO-STS ", " 1MIMO-LTS "～" 4MIMO-LTS " is referred to as " MIMO-LTS ", " the 1st data " and " the 2nd data " are referred to as " data ".
Fig. 4 is the sequential chart of the communication steps that becomes comparison other in the expression communication system 100.Represent that the 1st wireless device 10a obtains the action of the transfer rate information of the 2nd wireless device 10b here.For making interest of clarity, omit the adaptive array signal processing action.The 1st wireless device 10a sends transfer rate request signal (S10) to the 2nd wireless device 10b.The 2nd wireless device 10b sends transfer rate information (S12) to the 1st wireless device 10a.The 1st wireless device 10a is according to transfer rate information, setting data transfer rate (S14).In other words, on one side with reference to transfer rate information, one side setting data transfer rate.The 1st wireless device 10a sends data (S16) according to the data transmission rate of setting.The 2nd wireless device 10b carries out to receive for data and handles (S18).
After adopting above action, as previously mentioned, the transfer rate information among the 2nd wireless device 10b is following the fashionable mistake that comprises.Need after the first, the 2 wireless device 10b decision transfer rate information certain during the time.Promptly the characteristic of the transmission line between the 1st wireless device 10a and the 2nd wireless device 10b changes usually, and therefore the content of transfer rate information also changes.For example, when decision transfer rate information, can receive by enough 500Mbps, and when the data that receive from the 1st wireless device 10a, receiving with 500Mbps but becomes the limit.The second, during with the data that receive from the 1st wireless device 10a, the radical of the antenna of the 1st wireless device of use is not simultaneously when being the 2nd wireless device 10b decision transfer rate information.In other words, the 2nd wireless device 10b is when decision transfer rate information, if there is not to receive the training signal from all antennas 12, just there is unknown transmission line in that, just can not derive correct transfer rate information.For example, if derive transfer rate information, so just do not consider the influence of the 3rd antenna 12c and the 4th antenna 12d according to signal from the 1st antenna 12a and the 2nd antenna 12b.Its result, transfer rate information just comprises error.
Fig. 5 is the sequential chart of other communication steps that becomes comparison other in the expression communication system 100.Here, the expression data are by the action of MIMO transmission.The 1st wireless device 10a sends train request signal (S20) to the 2nd wireless device 10b.The train request signal is reached " the 2nd data " by Fig. 3 (a) " the 1st data " and comprises.The 2nd wireless device 10b sends training signal (S22) to the 1st wireless device 10a.The 1st wireless device 10a derives the transmission route vector according to the training signal that receives, and sets it (S24).The 1st wireless device 10a uses the transmission route vector on one side, Yi Bian the data of transmission (S26).The 2nd wireless device 10b derives and receives weight vector for the data that receive, and sets it (S28).And then the 2nd wireless device 10b carries out the reception of data and handles (S30) according to receiving weight vector.
After adopting above action, because the 2nd wireless device 10b sends training signal from all antennas 14, power consumption increases.On the other hand, the data transmission rate in the transfer rate information is low to a certain degree the time, even wireless 14 the quantity that should use sometimes is less good.At this moment, even the never predetermined wireless 14 transmission training signals that use also can suppress the deterioration of transmission quality.Particularly the 2nd wireless device 10b is a terminal installation, and when being battery-operated, power consumption is preferably lower.
Fig. 6 representes the structure of the 1st wireless device 10a.The 1st wireless device 10a; Comprise the 1st radio section 20a, the 2nd radio section 20b, the 3rd radio section 20c, the 4th radio section 20d that are collectively referred to as " radio section 20 ", be collectively referred to as the 1st handling part 22a, the 2nd handling part 22b, the 3rd handling part 22c, the 4th handling part 22d of " handling part 22 "; Be collectively referred to as the 1st department of modulation and demodulation 24a, the 2nd department of modulation and demodulation 24b of " department of modulation and demodulation 24 ", the 3rd day department of modulation and demodulation 24c, the 4th department of modulation and demodulation 24d, IF portion 26, selection portion 28, control part 30, transfer rate Information Management Department 32.In addition; As signal; Comprise the 1st time zone signal 200a, the 2nd time zone signal 200b, the 3rd time zone signal 200c, the 4th time zone signal 200d that are collectively referred to as " time zone signal 200 ", be collectively referred to as the 1st frequency field signal 202a, the 2nd frequency field signal 202b, the 3rd frequency field signal 202c, the 4th frequency field signal 202d of " frequency field signal 202 ".In addition, the 2nd wireless device 10b also has same structure.In addition, the 1st wireless device 10a and the 2nd wireless device 10b along with being base station apparatus or terminal installation and comprise various structure, but here, omit for making interest of clarity.
Radio section 20 as receiving action, carries out frequency translation, the signal of derived pulse string to the radio-frequency signals that receives in the antenna 12.Radio section 20 is exported as time zone signal 200 signal of pulse train to handling part 22.Because in general, the signal of pulse train is by forming with phase constituent and orthogonal component, so should be transmitted by two signal line.But in order to make drawing succinct, only represent a signal line here.In addition, also comprise AGC and A/D transformation component.Radio section 20 as sending action, carries out frequency translation to the signal from the pulse train of handling part 22, derives radio-frequency signals.Here, from the signal of the pulse train of handling part 22 also as 200 expressions of time zone signal.Radio section 20 is to antenna 12 output radio-frequency signals.In addition, also comprise PA (Power Amplifier) and D/A transformation component.Time zone signal 200 is the multi-carrier signals that are transformed into time zone, is digital signal.And then the signal that in radio section 20, is processed forms burst signal, and this burst format is shown in Fig. 3 (a)-(b).
Handling part 22 as receiving action, is transformed into frequency field respectively with a plurality of time zone signals 200, the signal of frequency field is carried out adaptive array signal handle.Handling part 22 is with the adaptive array signal process result, as 202 outputs of frequency field signal.A frequency field signal 202, corresponding with the signal that is sent by an antenna 14 among Fig. 2, it is equivalent to and a signal that transmission line is corresponding.Handling part 22 as sending action, from the frequency field signal 202 of department of modulation and demodulation 24 inputs as the signal of frequency field, is carried out adaptive array signal to the signal of frequency field and is handled.And then the signal that handling part 22 was handled adaptive array signal is transformed into time zone, as 200 outputs of time zone signal.The quantity of the antenna 12 that in sending processing, should use is specified by control part 30.Here, the signal of frequency field---frequency field signal 202, as shown in Figure 1, comprise a plurality of subcarrier compositions.In order to make drawing succinct, the signal of frequency field forms serial signal according to the sequence arrangement of subcarrier number.
Fig. 7 representes the structure of the signal of frequency field.Here, with a combination of subcarrier number shown in Figure 1 " 26 "～" 26 ", as " OFDM symbol "." i " individual OFDM symbol is according to the order of subcarrier number " 1 "～" 26 ", subcarrier number " 26 "～" 1 ", arrangement of subcarrier composition.In addition, before " i " individual OFDM symbol, configuration " i-1 " individual OMDM symbol; After " i " individual OFDM symbol, configuration " i+1 " individual OMDM symbol.
Return Fig. 6, department of modulation and demodulation 24 is handled as receiving, and to the frequency field signal 202 from handling part 22, carries out demodulation and decoding.In addition, demodulation and decoding are carried out with subcarrier unit.Department of modulation and demodulation 24 is to the signal of IF portion 26 output decodings.In addition, department of modulation and demodulation 24 is handled as sending, and carries out encode and modulation.Department of modulation and demodulation 24 as frequency field signal 202, is exported the signal of modulating to handling part 22.When sending processing, modulator approach and encode rate are specified by control part 30.The transfer rate information that this appointment is told about according to preamble is carried out.
IF portion 26 handles as receiving, and synthetic signal from a plurality of department of modulation and demodulation 24 forms a data flow.IF portion 26 output streams.In addition, IF portion 26 handles as sending, input traffic, and with its separation.And then, with the data of separating, to a plurality of department of modulation and demodulation 24 outputs.
Now, tell about the situation that adopts above structure to send request signal.Handling part 22, like Fig. 3 (a) or (b), at least one from a plurality of antennas 12 sent the data corresponding with each antenna 12.When the quantity of the antenna 12 that should use is " 2 ", be equivalent to Fig. 3 (a) or (b) in " the 1st data " and " the 2nd data ".The quantity of the antenna 12 that the transmission data should be used is specified by control part 30.And then handling part 22 is the sort of data such as " Legacy STS " signal in addition of appended drawings 3 (a) also.In addition, when the quantity of the antenna 12 that the transmission data should be used is " 4 ", appended drawings 3 (a)-(b) unshowned " the 3rd data " and " the 4th data ".This data send to the 2nd wireless device 10b corresponding with the variable data transfer rate.
Control part 30 generates the request signal that is intended to the transfer rate information among the 2nd wireless device 10b is offered the 2nd wireless device 10b.And then control part 30 is exported the request signal that generates to department of modulation and demodulation 24.Handling part 22 also from comprising a plurality of antennas 12 for the antenna 12 beyond the antenna 12 that sends data, sends respectively the known signal corresponding with a plurality of antenna 12 when sending request signal.Here, request signal is assigned to " the 1st data " and " the 2nd data " of Fig. 3 (b).In addition, in Fig. 3 (b), known signal is equivalent to " 1MIMO-STS ", " 1MIMO-LTS "～" 4MIMO-STS ", " 4MIMO-LTS ".Its result, shown in Fig. 3 (b), even for the radical " even 2 " of the antenna 12 that sends data, it be training signal that handling part 22 also can send known signals from " 4 " individual antenna 12.Like this, after known signal and training signal combination transmission, the 1st wireless device 10a makes the 2nd wireless device 10b according to training signal, generates transfer rate information, can obtain the transfer rate information of generation.Its result, the precision of the transfer rate information of the 2nd wireless device 10b that is obtained by the 1st wireless device 10a is improved.
Tell about correspondingly with above, tell about the situation that receives request signal and training signal.Control part 30 generates transfer rate information according to the training signal that receives.Generating the method for transfer rate information, can be arbitrarily.For example can measure in the radio section 20 signal strength signal intensity of the signal that receives, with measured signal strengths and threshold ratio, thus generation transfer rate information.Perhaps, generate transfer rate information according to the reception weight vector that derives in the handling part 22.In addition, generate an example of transfer rate information, will tell about at the back literary composition.And then, can also generate transfer rate information according to modulation result in department of modulation and demodulation 24.The transfer rate information of decision doing the media transmission through department of modulation and demodulation 24, handling part 22, radio section 20 when, also is transmitted rate Information Management Department 32 and keeps.In addition, transfer rate Information Management Department 32 also keeps the transfer rate information in the wireless device 10 of communication object.
In above structure, in order to reduce power consumption, the 1st wireless device 10a carries out following action.Radio section 20 utilizes a plurality of antennas 12, receives training signal from the 2nd wireless device 10b.Selection portion 28 is according to the training signal that receives, at least one that select when receiving from the data of the 2nd wireless device 10b, should to use in a plurality of antennas 12.In particular, carry out following steps.Each the corresponding signal strength signal intensity with a plurality of antennas 12 derives according to the training signal that radio section 20 receives in selection portion 28.The big antenna 12 of selection portion 28 preferential selection intensities.For example, when the quantity of the antenna 12 that should use when the reception data was " 3 ", " 3 " individual antenna 12 was selected by selection portion 28 from the bigger antenna 12 of intensity.In addition, the sum of the antenna 12 that should select according to the value of the data transmission rate that should transmit and power consumption, is specified separately.The antenna 12 that handling part 22 uses selection portion 28 to select on one side is Yi Bian send training signal.Like this, through reducing the quantity of the antenna 12 send training signal, thereby reduce power consumption.
In addition, when not sending request signal, also can carry out above action.In other words, during from the 2nd wireless device 10b reception train request signal, also can use.At least one that i.e. selection portion 28 should use when selecting reception in a plurality of antennas 12 from the data of the 2nd wireless device 10b.At this moment, according to selecting from the instruction of control part 30.At least one from a plurality of antennas 12 of handling part 22; Send the data corresponding to the 2nd wireless device 10b with each antenna 12; And irrelevant with the radical that sends the antenna 12 that should use when the data, also send the training signal corresponding with each antenna of selection portion 28 selections 12.For example, data are sent by " 2 " individual antenna 12, and training signal is sent by " 3 " individual antenna 12.
This structure, the CPU of the enough computers arbitrarily of ability, memory and the realization of other LSI hardware property ground can be through software property such as the program block ground realizations that reservation function is arranged of memory download.But draw the functional block that realizes together by them here.So these functional blocks realize with various forms after can having only hardware, have only software or passing through their combination.To this, those skilled in the art can understand certainly.
Fig. 8 representes the structure of the 1st handling part 22a.The 1st handling part 22a comprises FFT (Fast Fourier Transform) portion 40, synthetic portion 42, contrast signal generation portion 44, receives weight vector calculating part 54, separated part 46, transmission route vector calculation portion 52, IFFT portion 48, lead code appendix 50.In addition, synthetic portion 42 comprises the 1st multiplier 56a, the 2nd multiplier 56b, the 3rd multiplier 56c, the 4th multiplier 56d, the addition portion 60 that is referred to as multiplier 56.In addition, separated part 46 comprises the 1st multiplier 58a, the 2nd multiplier 58b, the 3rd multiplier 58c, the 4th multiplier 58d that is referred to as multiplier 58.
The a plurality of time zone signals 200 of FFT portion 40 inputs are carried out transformation of page in Fu for each, derive the signal of frequency field.As previously mentioned, the signal of a frequency field, according to the order of subcarrier number, the signal that serial arrangement is corresponding with subcarrier.
According to from the reception weight vector that receives weight vector calculating part 54, the signal of frequency field is carried out weighting, addition portion 60 is with the output addition of multiplier 56.Here, because the signal of frequency field is by the arranged in order according to subcarrier number, so also disposed accordingly with it from the reception weight vector that receives weight vector calculating part 54.In other words, a multiplier 56 is imported the reception weight vector according to the arranged in order of subcarrier number one by one.Therefore, addition portion 60 is with subcarrier unit, with the addition of multiplication result of calculation.Its result, added signal are also as shown in Figure 7, according to the order of subcarrier number, serial arrangement.In addition, added signal is the frequency field signal 202 that preamble is told about.
In addition, in following telling about, at the signal of process object and frequency field at once, also basically with subcarrier as unit, carry out and handle.For making interest of clarity, tell about the processing in the number of sub-carrier here.Therefore, in processing, carry out the processing in the number of sub-carrier through parallel or serial to a plurality of subcarriers, thus corresponding.
Contrast signal generation portion 44; During " Legacy STS ", " Legacy LTS ", " 1MIMO-STS ", " 1MIMO-LTS ", " Legacy STS ", " Legacy LTS ", " 1MIMO-STS ", " 1MIMO-LTS " of memory in advance exported as contrast signal.In addition, in addition during, according to the threshold value of predesignating, judge frequency field signal 202, its result is exported as contrast signal.In addition, judging it is not hard decision, can be soft decision.
Receive weight vector calculating part 54 according to from signal, frequency field signal 202, the contrast signal of frequency field of FFT portion 40, derive and receive weight vector.Receiving the deriving method of weight vector, can be arbitrarily, and one of them is to adopt LMS (Least Mean Squeare) algorithm to derive.In addition, receiving weight vector can also derive through relevant treatment.At this moment, the signal of frequency field and contrast signal not only by the 1st handling part 22a, but also utilize not shown holding wire, by inputs such as the 2nd handling part 22b.If the contrast signal of establishing the signal of the frequency field among the 1st handling part 22a and being the signal of the frequency field among x1 (t), the 2nd handling part 22b and be contrast signal among x2 (t), the 1st handling part 22a and be among S1 (t), the 2nd handling part 22b is S2 (t); X1 (t) and x2 (t) just can represent with formula so.
[formula 1]
x 1(t)＝h 11S 1(t)+h 21S 2(t)
x 2(t)＝h 12S 1(t)+h 22S 2(t)
Here, noise is ignored.The 1st relevant ranks R1, with E as population mean after, can represent with formula.
[formula 2]
R 1 = E [ x 1 S 1 * ] E [ x 1 S 2 * ] E [ x 2 S 1 * ] E [ x 2 S 2 * ]
Between contrast signal the 2nd ranks R2 that is correlated with can represent with formula.
[formula 3]
R 2 = E [ S 1 S 1 * ] E [ S 1 S 2 * ] E [ S 2 S 1 * ] E [ S 2 S 2 * ]
Finally, after the relevant ranks R1 with the 1st of anti-ranks of the 2nd relevant ranks R2 multiplied each other, derive the reception answer vector.
[formula 4]
h 11 h 21 h 12 h 22 = R 1 R 2 - 1
And then, receive weight vector calculating part 54 according to receiving answer vector, calculate the reception weight vector.
The necessary transmission route vector of weighting of frequency field signal 202 according to receiving weight vector, is inferred by transmission route vector calculation portion 52.The presuming method of transmission route vector is arbitrarily.But, can intactly use the reception weight vector as the simplest method.Perhaps it is also conceivable that the Doppler frequency change that receives the transmission environment of handling and send the time difference generation of handling, adopt existing technology, the corrected received weight vector.In addition, here, will receive weight vector and intactly be used for the transmission route vector.
Multiplier 58 carries out weighting according to the transmission route vector to frequency field signal 202, and its result is exported to IFFT portion 48.In addition, IFFT portion 48 carries out transformation of page in anti-Fu for the signal from multiplier 58, and it is transformed into the signal of time zone.Lead code appendix 50, shown in Fig. 3 (a)-(b), the part Additional Preamble sign indicating number in the front of burst signal.Here, additional " Legacy STS ", " Legacy LTS ", " 1MIMO-STS ", " 1MIMO-LTS ".Lead code appendix 50 will have been added the signal of lead code, as 200 outputs of time zone signal.In addition, above action receives control part 30 controls of Fig. 6.In Fig. 8, the 1st time zone signal 200a etc. is shown at 2 positions.They are unidirectional signals, with the two-way signaling among Fig. 6---and the 1st time zone signal 200a etc. are corresponding.
Now, tell about the action of the communication system 100 that adopts above structure.Fig. 9 is the sequential chart of the step of the setting data transfer rate in the expression communication system 100.Fig. 9 is the sequential chart when sending transfer rate request signal and training signal, and is corresponding with Fig. 4.The 1st wireless device 10a sends transfer rate request signal and training signal (S40) to the 2nd wireless device 10b shown in Fig. 3 (b).The 2nd wireless device 10b carries out transmission line and infers (S42) according to training signal.Here, transmission line is inferred and is equivalent to the derivation reception weight vector that preamble is told about.The presumptive transmission line of the 2nd wireless device 10b upgrades transfer rate information (S44).Here, repeat no more for upgrading transfer rate information.The 2nd wireless device 10b sends transfer rate information (S46) to the 1st wireless device 10a.The transfer rate information that the 1st wireless device 10a reference on one side receives, on one side setting data transfer rate (S48).
Figure 10 is the sequential chart of the step of the setting data transfer rate among expression the 1st wireless device 10a.Figure 10 is corresponding with the action of the 1st wireless device 10a of Fig. 9.Handling part 22 sends transfer rate request signal (S50) with the form of the training signal shown in Fig. 3 (b).If IF portion 26 through antenna 12a, radio section 20, handling part 22, department of modulation and demodulation 24, does not receive transfer rate information (N of S52), just wait until always receive till.On the other hand, if IF portion 26 receives transfer rate information (Y of S52), control part 30 is just set transfer rate information (S54).In addition, transfer rate Information Management Department 32 keeps transfer rate information.
Figure 11 is the sequential chart of other step of the setting data transfer rate in the expression communication system 100.Figure 11 considers to carry out adaptive array signal to Fig. 9 to handle, and is intended to reduce the processing sequential chart of power consumption, and is corresponding with Fig. 5.The 1st wireless device 10a sends train request signal (S60) to the 2nd wireless device 10b.The 2nd wireless device 10b sends training signal (S62) to the 1st wireless device 10a.The 1st wireless device 10a selects antenna 12 (S64) according to the intensity of the training signal that receives.The 1st wireless device 10a sends transfer rate request signal and training signal (S66) to the 2nd wireless device 10b shown in Fig. 3 (b).In addition, training signal is sent by the antenna of selecting 12.
The 2nd wireless device 10b carries out transmission line and infers (S68) according to training signal.The presumptive transmission line of the 2nd wireless device 10b upgrades transfer rate information (S70).The 2nd wireless device 10b sends transfer rate information (S74) to the 1st wireless device 10a.At this moment, use the transmission route vector, handle thereby carry out adaptive array signal.The 1st wireless device 10a sets and receives weight vector (S76) according to the burst signal that comprises transfer rate information.And then, use reception weight vector on one side, receive the transfer rate information (S78) of handling on one side.The transfer rate information that the 1st wireless device 10a reference on one side receives, on one side setting data transfer rate (S80).
Figure 12 is the sequential chart of other step of the setting data transfer rate among expression the 1st wireless device 10a.Figure 12 is corresponding with the action of the 1st wireless device 10a of Figure 11.Handling part 22 sends train request signal (S90).Radio section 20 receives training signal (S92).Selection portion 28 according to the intensity of measuring, selects antenna 12 (S94) with the intensity that antenna 12 units measure the training signal that receives.Handling part 22 sends training signal from the antenna of selecting 12, but also sends transfer rate request signal (S96) with the form of the training signal shown in Fig. 3 (b).
If media is not done through antenna 12, radio section 20, handling part 22, department of modulation and demodulation 24 by IF portion 26, receive transfer rate information (N of S98), just wait until till the reception always.On the other hand, if IF portion 26 receives transfer rate information (Y of S98), handling part 22 is just set and is received weight vector (S100).In addition, handling part 22, department of modulation and demodulation 24, IF portion 26 carry out to receive and handle (S102).Control part 30 is set transfer rate information (S104).In addition, transfer rate Information Management Department 32 keeps transfer rate information.
Figure 13 is the sequential chart of the communication steps in the expression communication system 100.Figure 13 is the processing sequential chart that in sending training signal, is intended to reduce power consumption.The 1st wireless device 10a sends train request signal (S110) to the 2nd wireless device 10b.The antenna 14 (S112) that should use during the 2nd wireless device 10b selective reception data.In addition, the antenna 14 of the 2nd wireless device 10b from selecting sends training signal (S114) to the 1st wireless device 10a.The 1st wireless device 10a sets transmission route vector (S116) according to the intensity of the training signal that receives.The 1st wireless device 10a uses the transmission route vector on one side, to 2nd wireless device 10b send data (S118) on one side.The 2nd wireless device 10b derives and receives weight vector according to comprising the burst signal of data, and sets it (S120).The 2nd wireless device 10b handles according to receiving weight vector, carry out to receive.
Figure 14 is the flow chart of the forwarding step among expression the 2nd wireless device 10b.The action of the 2nd wireless device 10b among Figure 14 and Figure 13 is corresponding.If media is done through antenna 12, radio section 20, handling part 22, department of modulation and demodulation 24 by IF portion 26, do not receive train request signal (N of S130), just do not begin to handle.On the other hand, if IF portion 26 receives train request signal (Y of S130), the antenna 14 (S132) of control part 30 with regard to using when the selective reception.Handling part 22 sends training signal (S134) from the antenna of selecting 14.
In embodiment up to now, when sending training signal, it is beam-shaping that the 1st wireless device 10a does not carry out the adaptive array signal processing.This is for the directive property at antenna is in the non-direction state, makes the 2nd wireless device 10b carry out the cause that transmission line is inferred.In other words, for the 2nd wireless device 10b, in state near original transmission line; As previously mentioned; When making the combination of training signal and data request signal, the 1st wireless device 10a carries out following processing, thereby can make the 2nd wireless device 10b determine transfer rate information at high speed.If the 1st wireless device 10a carries out beam-shaping, compare when not carrying out so, can improve the SNR (Signal to Noise Ratio) when receiving among the 2nd wireless device 10b.The 2nd wireless device 10b is according to SNR, during the determination data transfer rate, improve SNR after, the data transmission rate of decision also uprises.Therefore, here, when sending training signal, the 1st wireless device 10a carries out beam-shaping to training signal at least.
Figure 15 is the sequential chart of other step of the setting data transfer rate in the expression communication system 100.The 2nd wireless device 10b sends data (S140) to the 1st wireless device 10a., suppose between the 1st wireless device 10a and the 2nd wireless device 10b implements communication, the value that data transmission rate is configured to stipulate here.The 1st wireless device 10a derives and receives weight vector (S142) according to the data that receive.The presumptive reception weight vector of the 1st wireless device 10a derives the transmission route vector, and sets it (S144).In addition, the 1st wireless device 10a carries out to receive to the data that receive and handles.The 1st wireless device 10a according to the transmission route vector of deriving, carries out beam-shaping on one side, on one side shown in Fig. 3 (b), send transfer rate request signal and training signal (S146) to the 2nd wireless device 10b.
The 2nd wireless device 10b carries out transmission line and infers (S148) according to training signal.The presumptive transmission line of the 2nd wireless device 10b upgrades transfer rate information (S150).In addition, the 2nd wireless device 10b derives the transmission route vector, and sets it (S152).The 2nd wireless device 10b sends transfer rate information (S154) to the 1st wireless device 10a.At this moment, use the transmission route vector, handle thereby carry out adaptive array signal.The 1st wireless device 10a sets and receives weight vector (S156) according to the burst signal that comprises transfer rate information.And then, use reception weight vector on one side, receive the transfer rate information (S158) of handling on one side.The transfer rate information that the 1st wireless device 10a reference on one side receives, on one side setting data transfer rate (S160).
Figure 16 is the flow chart of other step of the setting data transfer rate among expression the 1st wireless device 10a.Figure 16 is corresponding with the action of the 1st wireless device 10a of Figure 15.Radio section 20 receives data (S170).Handling part 22 calculates transmission route vector (S172), sets transmission route vector (S174).Handling part 22 on one side according to the transmission route vector, is carried out beam-shaping with the form of the training signal shown in Fig. 3 (b), sends training signal from antenna 12 on one side, but also sends transfer rate request signal (S176).
If media is done through antenna 12, radio section 20, handling part 22, department of modulation and demodulation 24 by IF portion 26, do not receive transfer rate information (N of S178), just wait until till the reception always.On the other hand, if IF portion 26 receives transfer rate information (Y of S178), handling part 22 is just set and is received weight vector (S180).In addition, handling part 22, department of modulation and demodulation 24, IF portion 26 carry out to receive and handle (S182).Control part 30 is set transfer rate information (S184).In addition, transfer rate Information Management Department 32 keeps transfer rate information.
Then, tell about the generation of transfer rate information.The generation of transfer rate information is carried out in the step 44 of Fig. 9, is undertaken by the 2nd wireless device 10b in addition.The transmission direction of transfer rate request signal is the 1st wireless device 10a by to the 2nd wireless device 10b the time, and the generation of transfer rate information is also carried out in the 1st wireless device 10a.But here, tell about as the processing among the 2nd wireless device 10b.At this moment, the structure of Fig. 6 is altered to antenna 14 by antenna 12.Figure 17 representes the structure of control part 30.Control part 30 comprises correlation computations portion 70, power ratio calculating part 72, process object determination section 74, transfer rate determination section 76, memory portion 78.
As the prerequisite of the processing in the control part 30, as previously mentioned, the radio section 20 of Fig. 6, handling part 22, department of modulation and demodulation 24, the training signal that utilizes antenna 14 to receive from the 1st wireless device 10a.Training signal is shown in Fig. 3 (b), by also comprising for the 1st antenna 12a that sends the 1st data and the 2nd data, a plurality of antennas 12 transmissions of the 2nd antenna 12b antenna 12 in addition.Training signal is equivalent to " MIMO-LTS ".In addition, each of training signal, each of quilt and a plurality of antennas 12 is stipulated accordingly.Receive weight vector calculating part 54 according to the training signals that receive, calculate respectively the reception answer vector corresponding with a plurality of antenna 12.Receive the computational methods of answer vector because preceding chatted and, so repeat no more.In addition, in the training signal that receives, as previously mentioned, use the OFDM modulation system, use a plurality of subcarriers.Therefore, each calculating to a plurality of subcarriers receives answer vector.
Correlation computations portion 70 is according to receiving answer vector, calculates respectively the correlation between the reception answer vector corresponding with a plurality of antenna 12.In Fig. 1, the transmission line property corresponding, promptly receive answer vector with the 1st antenna 12a, be represented as " h11 ", " h12 ", " h13 ", " h14 ".But here, conclude them and be referred to as " h1 ", the number of antenna 12 is decided to be " 2 ".Through after the above hypothesis, correlation computations portion 70 just adopts following formula, calculates correlation S.
[formula 5]
S = h 1 H h 2 h 1 H h 1 h 2 H h 2
This correlation S, corresponding with a number of sub-carrier, correlation computations portion 70 derives the correlation S corresponding with a plurality of subcarriers respectively.In addition, the molecule in the formula 5 can be correlation S.
Power ratio calculating part 72 is according to receiving answer vector, calculates respectively the power ratio between the reception answer vector corresponding with a plurality of antenna 12.Power ratio calculating part 72 adopts following formula, and rated output compares R.
[formula 6]
R = h 1 H h 1 h 2 H h 2
This power ratio R, corresponding with a number of sub-carrier, power ratio calculating part 72 is derived the power ratio R corresponding with a plurality of subcarriers respectively.
Process object determination section 74 is imported each corresponding a plurality of correlation S and a plurality of power ratio R with a plurality of subcarriers.Process object determination section 74 determines the object that uses when the determination data transfer rate according to a plurality of correlation S and a plurality of power ratio R.One of determining method is certain correlation S and the power ratio R that selects in a plurality of subcarriers.At this moment, not shown determination part is measured the signal strength signal intensity as far as each of a plurality of subcarriers, and process object determination section 74 is selected the bigger subcarrier of signal strength signal intensity.Perhaps, for a plurality of correlation S and a plurality of power ratio R, it is for example average to carry out statistical disposition respectively, correlation S after counting statistics is handled and the power ratio R after the statistical disposition.Below, also, be called correlation S and power ratio R with the correlation S and the power ratio R of 74 decisions of process object determination section.
Transfer rate determination section 76 according to from correlation S and the power ratio R of process object determination section 74, determine the data transmission rate for data.At this moment, the determinating reference of remembering with reference to memory portion 78.Figure 18 representes the structure of the determinating reference of memory portion 78 memories.Determinating reference is defined as the formation two-dimensional space by correlation and power ratio, and illustrated two-dimensional space is cut apart by a plurality of subregions " A ", " B ", " C ", " D ".Here, each of subregion " A "～" D ", corresponding with the predetermined data transfer rate.For example, if make its radical with antenna 12 corresponding, " A " is just corresponding with " 4 " so, and " B " is just corresponding with " 3 ", and " C " is just corresponding with " 2 ", and " D " is just corresponding with " 1 ".
In addition, modulation system and encode rate also can likewise be stipulated, through their combination, two-dimensional space are cut apart by more subregion.Return Figure 17.Transfer rate determination section 76 makes the correlation S of input and power ratio R corresponding with determinating reference, the subregion that the correlation S of specific input and power ratio R comprise.And then transfer rate determination section 76 is derived the data transmission rate of predesignating according to specific subregion.And then control part 30 is carried out above processing when having received the transfer rate request signal.In addition, when sending transfer rate information, comprise the data transmission rate of decision.In addition, what transfer rate determination section 76 can be according among the correlation S of process object determination section 74 and the power ratio R is some, the data transmission rate of decision for data.At this moment, can make processing succinct.
Then, tell about the burst format of the burst format distortion that makes shown in Fig. 3 (a).Shown in Fig. 3 (b), infer a plurality of transmission lines in order to make the 2nd wireless device 10b, send training signal by a plurality of antennas 12.As previously mentioned, the part of " 1MIMO-STS " etc. makes the 2nd wireless device 10b set the gain of AGC; The part of " 1MIMO-LTS " etc. makes the 2nd wireless device 10b infer transmission line.In the structure of Fig. 3 (b), in the situation shown in following, the receiving feature of the 1st data, the 2nd data might worsen.From the antenna that does not send data, i.e. loss in the transmission line of the 3rd antenna 12c, the 4th antenna 12d; Less than from the loss in the transmission line of the antenna them time; Because " 3MIMO-STS " and " 4MIMO-STS ", the receiving intensity of the 2nd wireless device 10b increases to a certain degree.Therefore, AGC becomes low value with gain setting.Its result, when demodulation " the 1st data " and " the 2nd data ", gain is just big inadequately, is easy to generate mistake.Tell about the burst format that is intended to suppress this transmission quality deterioration here.In addition, burst format forms in handling part 22 according to the instruction from control part 30.
Other structure of burst format in Figure 19 (a)-(b) expression communication system 100.Figure 19 (a) is equivalent to 3 MIMO-LTS and is assigned to the situation that 12,2 data of 3 antennas are assigned to 2 antennas 12 respectively respectively.Here, " Legacy STS "～" MIMO signal " is owing to identical with Fig. 3 (b), so repeat no more." MIMO-LTS " is assigned to each of 3 antennas 12 comprising the antenna 12 beyond the antenna 12 that is intended to send " MIMO-STS ".In other words, should send the quantity of the antenna 12 of " MIMO-LTS ", according to the quantity decision of the transmission line that should infer.On the other hand, should send the quantity of the antenna 12 of " MIMO-STS ", coincide with the quantity of the antenna that should send " data " 12.In other words, " MIMO-STS " and " data " by 22 ground regulations, and then is assigned to 2 same antennas 12 respectively.Therefore, the signal strength signal intensity when receiving " data ", when the gain of setting AGC, the signal strength signal intensity when becoming near reception " MIMO-STS ".Its result can suppress the deterioration of the receiving quality that the gain of AGC causes.
In the burst format of Figure 19 (a), " MIMO-STS " sent by antenna 12.Here, regulation " 1MIMO-STS " and " 2MIMO-STS " is used different subcarrier.For example, " 1MIMO-STS " uses the subcarrier of the subcarrier number of odd number, and " 2MIMO-STS " uses the subcarrier of the subcarrier number of even number.Both relation of this use about subcarrier is known as " audio frequency interlock (tone interleave) ".And then in " MIMO-LTS ", between 3 antennas 12, it is staggered to carry out audio frequency.When audio frequency staggered " 1MIMO-STS " waited, the OFDM symbolic number of " 1MIMO-STS " etc. extended to 3 times when not carrying out audio frequency and interlocking.
Figure 19 (b) is equivalent to 2 MIMO-LTS and is assigned to the situation that 12,1 data of 2 antennas are assigned to 1 antenna 12 respectively.As previously mentioned, when " data " were one, " MIMO-STS " can be shared with " Legacy STS "." Legacy STS " is in order to keep interchangeability and necessary signal with not corresponding with mimo system communication system, so can not omit.Therefore, " MIMO-STS " is omitted.We can say that " Legacy STS " is equivalent to " MIMO-STS ".
Figure 20 representes other structure of another kind of the burst format in the communication system 100.It is the same with Figure 19 (a), is equivalent to 3 MIMO-LTS and is assigned to the situation that 12,2 data of 3 antennas are assigned to 2 antennas 12 respectively respectively.In addition, about " MIMO-LTS ", the same with Figure 19 (a).Control part 30 increases till the quantity of the antenna that should send " MIMO-LTS " 12 quantity of the antenna 12 that should send " MIMO-STS ".In other words, as shown in the figure, make the quantity of antenna 12, be increased to " 3 " of Figure 20 by " 2 " of Figure 19 (a).And then, cut apart and increase before each corresponding data of antenna 12, make the data cut apart corresponding with the antenna 12 that has increased.
With each the corresponding data that increases preceding antenna 12, for example be equivalent to " the 2nd data " of Figure 19 (a) here.Control part 30 is divided into " the 2nd data " " the 1st half data " and " the 2nd half data " of Figure 20.And then control part 30 is carried out cutting apart of data with subcarrier as unit when partition data.In other words, " the 1st half data " and " the 2nd half data " exists the staggered relation of audio frequency.At this moment, the signal strength signal intensity when receiving " data ", the signal strength signal intensity when also when the gain of setting AGC, receiving near reception " MIMO-STS ".Its result can suppress the deterioration of the receiving quality that the gain of AGC causes.
Other structure of another kind of burst format in Figure 21 (a)-(d) expression communication system 100.It is also the same with Figure 19 (a), is equivalent to 3 MIMO-LTS and is assigned to the situation that 12,2 data of 3 antennas are assigned to 2 antennas 12 respectively respectively.In addition, about " MIMO-LTS ", the same with Figure 19 (a).Control part 30 makes in " MIMO-LTS ", the part corresponding with the antenna that is intended to send " MIMO-STS " 12 and with the corresponding part of the antenna 12 that is intended to send " MIMO-STS " antenna 12 in addition, be configured in the different moment., being intended to send the antenna 12 of " MIMO-STS " here, is the 1st antenna 12a and the 2nd antenna 12b.
Therefore, the part corresponding with them is equivalent to " 1MIMO-LTS " and " the 2MIMO-LTS ".On the other hand, being intended to send antenna 12 antenna 12 in addition of " MIMO-STS ", is the 3rd antenna 12c.Therefore, the part corresponding with it is equivalent to " 3MIMO-LTS ".As shown in the figure, they the time engrave by with staggering the configuration.In addition, regulation " 3MIMO-LTS " is used all subcarriers.After adopting this form, utilize AGC to amplify when " 1MIMO-LTS " and " 2MIMO-LTS ", do not receive the influence of " 3MIMO-LTS ", so can more correctly infer the transmission line that adopts them.At this moment, the signal strength signal intensity when receiving " data " also when the gain of setting AGC, becomes the signal strength signal intensity when receiving " MIMO-STS ".Its result can suppress the deterioration of the receiving quality that the gain of AGC causes.
Figure 21 (b) is equivalent to 2 MIMO-LTS and is assigned to the situation that 12,1 data of 2 antennas are assigned to 1 antenna 12 respectively.As shown in the figure, become corresponding structure with Figure 21 (a).Figure 21 (c) the also situation with Figure 21 (b) is identical, but has omitted " 1MIMO-STS ".We can say that " Legacy STS " is equivalent to " MIMO-STS ".Figure 21 (d) the also situation with Figure 21 (b) is identical, but Figure 21 (c) with compare, and then omitted " MIMO signal ".Therefore, can reduce additional quantity in the burst signal.At this moment, because do not comprise the control signal of mimo system, so this burst signal that needs identification to send in advance.For example send the train request signal in advance.
Below, tell about the variation of the burst format of Figure 20.In the burst format of Figure 20, make the quantity of quantity, data of quantity, the MIMO-LTS of MIMO-STS identical.In other words, send MIMO-STS, MIMO-LTS, data respectively from 3 antennas 12.After adopting this burst format, because the quantity of MIMO-STS and data is identical, so in the recipient, carry out the error that setting comprised that receives the AGC when handling for data and be reduced.In addition, because MIMO-STS sends from a plurality of antennas 12, so in the recipient, can infer the transmission line corresponding with a plurality of antenna 12.And then, because the quantity of MIMO-STS and MIMO-LTS is identical, so the precision of the transmission line of in the recipient, inferring according to MIMO-LTS uprises.
And then, in the following variation of telling about, the advantage below adding.For example, the data that the number of antenna 12 is " 3 ", should send be " 2 " series the time, some being cut apart in " 2 " series data that should send, thus after making data become " 3 " series, they just are assigned to each of " 3 " individual antenna 12.At this moment, there be cutting apart and the combination of the distribution of antenna 12 of a plurality of data.And then after the quantity of increase antenna 12, the number of combination also increases.In other words, partition data series some, when distributing to antenna 12 some, it is complicated that processing might become.The 1st variation, purpose are in the quantity of the quantity ratio antenna 12 of the series of the data that should send after a little while, on one side also can reduce treating capacity, Yi Bian give antenna 12 with data allocations.At this moment, the quantity of antenna 12 can be the quantity of sending the antenna 12 of MIMO-LTS at least.
Figure 22 (a)-(b) expression makes the structure of burst format of the burst format distortion of Figure 20, and it is equivalent to the 1st variation.Figure 22 (a)-(b) goes up represents and the corresponding signal of the 1st antenna 12a most with same up to now, and middle represents and the corresponding signal of the 2nd antenna 12b are descended represents and the corresponding signal of the 3rd antenna 12c most.Sometimes after concluding them, be called " burst signal ", perhaps will be called " burst signal " from the signal that an antenna 12 sends sometimes.Not distinguishing their ground here, uses.In addition, in burst signal, comprise " MIMO-LTS " as known signal etc. and data.In Figure 22 (a), Legacy STS (below be called " L-STS "), Legacy LTS (below be called " L-LTS "), Legacy signal (below be called " L-signal "), MIMO signal (below be called " MIMO signal ") only are assigned to the 1st antenna 12a.
Structure after them becomes the following stated.In addition, in following telling about, tentation data is should the data corresponding with 2 antennas 12.In other words, the quantity of the series of tentation data is less than the quantity of antenna 12.The control part 30 of Fig. 6 makes the quantity of the antenna 12 that send MIMO-STS and data, is increased to the quantity of the antenna 12 that send MIMO-LTS.In other words, control part 30 data with should send in the antenna 12 of MIMO-LTS at least one at once, make should corresponding antenna 12 quantity increase, thereby make data corresponding with the antenna that should send MIMO-LTS 12.Here, are " 3 " because should send the quantity of the antenna 12 of MIMO-LTS, also become " 3 " so should send the quantity of the antenna 12 of MIMO-STS and data.And then, cut apart with increase before antenna 12 each corresponding data, promptly after " 2 " serial data, make each of number of antennas 12 of the data cut apart and the antenna that should send MIMO-LTS 12 corresponding.
If it is further told about particularly, be exactly that control part 30 makes IF portion 26 that the data of " 2 " series are generalized into one so, with the data of concluding be divided into " 3 " individual after, distribute to " 3 " individual antenna 12.In addition, make data be equivalent to " 2 " serial data, good as data.At this moment, do not conclude data ground data are not divided into " 3 " individual.In addition, the quantity of antenna 12 also can be " 3 " in addition.Here, cutting apart of data for example becomes the data volume as far as each approximate equality of a plurality of antennas 12.In addition, can also be according to the rule of predesignating, partition data.Above result, shown in Figure 22 (a), MIMO-STS, MIMO-LTS, data are assigned to 3 antennas 12 respectively.Data among the figure are expressed as " the 1st partition data ", " the 2nd partition data ", " the 3rd partition data ".
As previously mentioned, control part 30 uses a plurality of subcarriers for MIMO-LTS and data, and each of a plurality of antennas 12 as unit, is changed the combination of each subcarrier that should use of MIMO-LTS.In other words, respectively with the 1st antenna 12a～corresponding MIMO-LTS of the 3rd antenna 12c, use different subcarriers.In Figure 22 (a), 1MIMO-LTS (1) uses the subcarrier of 1/3 in the full subcarrier; 2MIMO-LTS (1) also uses the subcarrier of 1/3 in the full subcarrier; 3MIMO-LTS (1) also uses the subcarrier of 1/3 in the full subcarrier.And then the subcarrier that in 1MIMO-LTS (1)～3MIMO-LTS (1), uses is as unduplicated subcarrier.In 1MIMO-LTS (2)～3MIMO-LTS (2), same relation is also set up; In 1MIMO-LTS (3)～3MIMO-LTS (3), same relation is also set up.In addition, 1MIMO-LTS (1), 1MIMO-LTS (2), 3MIMO-LTS (3) also use different subcarrier.In addition, 1MIMO-LTS (1), 1MIMO-LTS (2), 3MIMO-LTS (3), expression is assigned to the MIMO-LTS of different symbols.
Above rule can be regarded as for during the symbol, is assigned to each of MIMO-LTS of a plurality of antennas 12, uses different subcarrier.In addition, we can say the MIMO-LTS that is assigned to 1 antenna 12, also is each of MIMO-LTS that spreads all over a plurality of symbols, uses different subcarrier, and as a whole, all subcarriers that use should be used.And then, when making data and the antenna that should send MIMO-LTS is corresponding, in these data, use from the combination of the subcarrier of the antenna identical 12 transmissions with data.For example, the subcarrier that the 1st partition data is used is identical with the subcarrier that 1MIMO-LTS (1) uses.Through after such processing, can reduce treating capacity for partition data, can make data be assigned to each of a plurality of antennas 12.
In addition, since identical by the MIMO-LTS of front with the subcarrier of data use, so in not shown receiving system; Reception by the MIMO-LTS of a plurality of symbols configuration after; At least the MIMO-LTS according to the front infers transmission line, again according to its result, demodulating data.Because the subcarrier that the MIMO-LTS beyond the MIMO-LTS of front uses is different with the subcarrier that data are used, so do not use them even separate timing, also can suppress the deterioration of the quality of demodulation.Therefore, receiving system can be skipped the processing for the MIMO-LTS beyond the MIMO-LTS of front.Its result can use and abide by the same processing of receiving system of IEEE802.11a standard when reducing treating capacity.
Figure 22 (b) is the variation of Figure 22 (a), and is after the MIMO-STS, identical with Figure 22 (a).L-STS～MIMO signal also is assigned to the 2nd antenna 12b, the 3rd antenna 12c.At this moment, for example in the L-STS that is assigned to the 2nd antenna 12b, the 3rd antenna 12c, carry out CDD (Cyclic Delay Diversity).In other words, for the L-STS that is assigned to the 2nd antenna 12b, carry out time shifting.Be assigned to the L-STS of the 3rd antenna 12c, too.
Figure 23 is the flow chart of the expression forwarding step corresponding with the burst format of Figure 22 (a)-(b).Send training signal (Y of S220) if desired; And the quantity of antenna 12 that should send data is less than the quantity (Y of S222) of the antenna that should send training signal 12; Control part 30 is a unit with each of a plurality of antennas 12 just, obtains the subcarrier corresponding with training signal (S224).And then the subcarrier that control part 30 uses obtain makes data and the antenna that should send training signal 12 corresponding (S226).In other words, same with each the corresponding data and the training signal of a plurality of antennas 12, by audio frequency is staggered mutually.
Control part 30 is at least according to training signal and data, production burst string signal (S228).On the other hand; If should send the quantity of the antenna 12 of data be not less than the antenna 12 that send training signal quantity (N of S222) if, the quantity that promptly should send the antenna 12 of data equals to send the quantity of the antenna 12 of training signal; Control part 30 is just at least according to training signal and data, production burst string signal (S228).Wireless device 10 sends burst signal (S230).In addition, if need not send training signal (N of S220), with regard to end process.
Then, tell about the 2nd variation of the burst format of Figure 20.When a plurality of antennas 12 sent MIMO-LTS, from the characteristic of the some wireless transmission link in a plurality of antennas 12, when being not suitable for the transmission of data, the data of being sent by this antenna 12 just mistake might occur.The purpose of the 2nd variation wrong possibility occurs even be when a plurality of antennas 12 send data, also can reduce.In addition, the burst format in this variation is with Figure 20, Figure 22 (a)-(b) expression.
The control part 30 of Fig. 6; As previously mentioned, data with should send in the antenna 12 of MIMO-LTS at least one at once, shown in Figure 20, Figure 22 (a)-(b); Make should corresponding antenna 12 quantity increase, thereby make data corresponding with the antenna that should send MIMO-LTS 12.In addition, control part 30 makes 12 pairs on data and the antenna that should send MIMO-LTS seasonable, gives antenna 12 decisions that send MIMO-LTS than making the data correspondence low data transmission rate of data transmission rate before.For example, the quantity that should send the antenna 12 of MIMO-LTS is that " 3 ", data are " 2 " whens series, if the data transmission rate of the data during " 2 " series is 100Mbps, the data transmission rate of the data during so as " 3 " series is exactly 50Mbps.In addition, so-called " making data and the antenna that should send MIMO-LTS 12 corresponding data transmission rates before " both can be the data transmission rate of in communication up to now, using, and also can be the data transmission rate according to the characteristic decision of transmission line.Here, as previously mentioned, data transmission rate depends on the encode rate of modulation system, error correction, the radical of antenna 12.
Figure 24 is the flow chart of the forwarding step of other corresponding with the burst format of Figure 22 (a)-(b) of expression.Send training signal (Y of S200) if desired, and the quantity of antenna 12 that should send data is less than the quantity (Y of S202) of the antenna that should send training signal 12, control part 30 just makes data and the antenna that should send training signal 12 corresponding (S204).And then control part 30 reduces the data transmission rate (S206) of data.Control part 30 is at least according to training signal and data, production burst string signal (S208).On the other hand; If should send the quantity of the antenna 12 of data be not less than the antenna 12 that send training signal quantity (N of S202) if, the quantity that promptly should send the antenna 12 of data equals to send the quantity of the antenna 12 of training signal; Control part 30 is just at least according to training signal and data, production burst string signal (S208).Wireless device 10 sends burst signal (S210).In addition, if need not send training signal (N of S200), with regard to end process.
After adopting embodiments of the invention; When the wireless device to communication object sends request signal; Because from a plurality of antenna transmission training signals; So can obtain the transfer rate information of the wireless device of communication object, and, can improve the precision of transfer rate information according to the transfer rate information that training signal generates.In addition, because after using training signal, can consider the influence of various transmission lines, and meanwhile transfer rate information determined, so can improve the precision of transfer rate information.In addition, because send request signal and training signal continuously, so can obtain up-to-date transfer rate information.In addition because can obtain up-to-date transfer rate information, so even transmission line when change also can reduce the error of transfer rate information.In addition, when the transfer rate information of the wireless device that needs communication object, send request signal, thereby, also can obtain correct transfer rate information even can not regularly send transfer rate information the time.In addition, improve the precision of transfer rate information after, can reduce the error of data, can improve the control precision when the transmission data.In addition, because transfer rate request signal and training signal combination back are sent, so can suppress the reduction of the data transmission rate of validity.
In addition, because reduce the quantity of the antenna that send training signal, so can reduce power consumption.In addition, because from the communication antenna transmission training signal that should use, so deterioration that can suppression characteristic.In addition because can reduce power consumption, so when battery-operated, can over reach during.In addition, because can reduce power consumption, so can make the wireless device miniaturization.In addition, because preferentially select the high antenna of signal strength signal intensity, can suppress the deterioration of the transmission quality of data.In addition, because select antenna,, can suppress the deterioration of the transmission quality of data so can reduce power consumption according to radio quality.In addition, because from should receiving the antenna transmission known signal of data, thus the deterioration of the transmission route vector that can suppress to derive in the wireless device of communication object, and because select send the antenna of data, so can reduce power consumption.In addition, because can make the transmission route vector of derivation correct, so the deterioration of directive property that can suppressing antenna.
In addition, when sending training signal, carry out beam-shaping, thereby can increase the signal strength signal intensity in the wireless device of communication object, can obtain and have the more transfer rate information of the value of high transmission rates.In addition, when sending data, also carry out beam-shaping, so can obtain the data transmission rate when the transmission that is suitable for data owing to reality.In addition, because when the determination data transfer rate, considered to receive the correlation between the answer vector and received the strength ratio between the answer vector, so can reflect the influence between the signal of each transmission of a plurality of antennas.In addition, can improve the correctness of the transfer rate information of decision.In addition, owing in mimo system,, just can improve transmission characteristic, also can improve transmission characteristic if reduce strength ratio, so can reflect this transfer rate of determination data idiocratically if reduce correlation.In addition, according to correlation and strength ratio determination data transfer rate, can be applicable to the system that uses a plurality of subcarriers.In addition, because when receiving training, also receive the transfer rate request signal,, can supply with the very high transfer rate information of precision so can notify the transfer rate information of decision.
In addition, be same antenna because make the antenna that sends MIMO-STS and data, so in the recipient, the signal strength signal intensity of the signal strength signal intensity in the time of can making the MIMO-STS that is received in when the gain of setting AGC during with the reception data is approaching.In addition, can suppress the deterioration of the receiving quality that the gain of AGC causes.In addition; Owing to can reduce the influence that the part corresponding with the antenna that sends MIMO antenna in addition causes the corresponding part of antenna with transmission MIMO-STS; So in the recipient, can improve the precision that the transmission line of the part corresponding with the antenna that sends MIMO-STS is inferred.In addition, can also reduce interference between the divided data.
In addition, make data and the antenna that should send MIMO-LTS,, also can reduce the error that data occur through reducing data transmission rate even when being not suitable for the transmission of data from the characteristic of the transmission line of corresponding antenna at once.In addition, along with the increase of the quantity of the antenna that sends MIMO-LTS, the quantity of sending the antenna of MIMO-STS also increases, and can send the series of the data identical with the quantity of the antenna that sends MIMO-STS.In addition, even when the quantity of the series of data is increased, also can suppress the decline of the transmission quality of data.In addition, make data and a plurality of antenna at once, the MIMO-LTS corresponding with 1 antenna and with data in, use identical subcarrier, thus can be for each data, be easy to select the subcarrier that use.In addition, even should send the number change of series of quantity and data of antenna of MIMO-LTS the time, also can be easy to give antenna with data allocations.In addition, after 2 variation of combination as far as Figure 20, can obtain both effects.
(embodiment 2)
Embodiments of the invention 2 and embodiment 1 are same, relate to mimo system, particularly the dispensing device in the mimo system.The dispensing device that present embodiment relates to is equivalent to the 1st wireless device and the sending function of the 2nd wireless device among the embodiment 1.And then in the situation identical with the situation that should send training signal of embodiment 1, dispensing device sends training signal.Here, be that the center is told about to comprise training signal in interior burst format, the situation of sending training signal is because of identical with embodiment 1, so repeat no more.Dispensing device sends the burst signal of a plurality of series corresponding with the quantity of a plurality of antennas, a plurality of MIMO-STS of configuration in the burst signal of a plurality of series.In addition, after a plurality of MIMO-STS, dispensing device disposes a plurality of MIMO-LTS in the burst signal of a plurality of series.And then dispensing device makes a part of configuration data in the burst signal of a plurality of series.Dispensing device be through after will turning to ranks and data and multiplying each other, thereby data are increased to till the quantity of a plurality of series.In addition, dispensing device also will turn to ranks and MIMO-LTS to multiply each other.But dispensing device will not turn to ranks and MIMO-STS to multiply each other.Below, will with the burst signal of a plurality of series that turn to ranks to multiply each other, also the same with up to now, be not called " burst signals of a plurality of series " with making any distinction between.
Here, MIMO-STS has the cycle of regulation.Specifically, give the periodic signal additional mask of 1.6 μ s interval.In addition, turn in the ranks, comprise the composition that makes serial unit carry out circulative time shifting what preamble was told about.Circulative time shifting is known as CDD (Cyclic Delay Diversity),, in the cycle of the directional diagram that comprises for MIMO-LTS, carries out circulative time shifting here.Data are also carried out same processing.In addition, the time shifting amount, with the burst signal of a plurality of series as unit and difference, but in these time shifting amounts at least one was specified to more than the cycle of MIMO-STS.As above processing, dispensing device makes the burst signal distortion of a plurality of series, is sent the burst signal of a plurality of series after the distortion respectively by a plurality of antennas.
The problem corresponding with above the sort of embodiment also can be used following language representation.In other words, the sort of burst format of the precision that the transmission line in the wireless device of hope utilization raising communication object is inferred is sent training signal.In addition, the sort of burst format of the precision of the transfer rate information in the wireless device of hope utilization raising communication object is sent training signal.In addition,, also utilize the sort of burst format of the deterioration of the communication quality that suppresses data, send data even when hoping to send this training signal.In addition, hope effectively utilizes training signal in order to receive data.
Figure 25 representes the structure of the dispensing device 300 that embodiments of the invention 2 relate to.Dispensing device 300 comprises error correction portion 310, staggered portion 312, modulation portion 314, lead code appendix 316, spatial dispersion portion 318, the 1st radio section 20a that is referred to as " radio section 20 ", the 2nd radio section 20b, the 3rd radio section 20c, the 4th radio section 20d, the 1st antenna 12a that is referred to as " antenna 12 ", the 2nd antenna 12b, the 3rd antenna 12c, the 4th antenna 12d; Antenna 14 the 1st antenna 14a, the 2nd antenna 14b, the 3rd antenna 14c, the 4th antenna 14d.Here, the dispensing device 300 of Figure 25 is equivalent to the part of the 1st wireless device 10a of Fig. 6.
Error correction portion 310 is intended to the encode of error correction to data., carry out convolutional codeization here, its encode rate is selected from the value of predesignating.The data of staggered portion 312 staggered convolutional codeizations, and then staggered portion 312 becomes the back output of a plurality of series with data separating.Separate into 2 series here.The data of 2 series can be described as mutually independently data.
Each of the data of 314 pairs of 2 series of modulation portion is carried out modulation.Lead code appendix 316 is to the data Additional Preamble sign indicating number of modulating.Therefore, as lead code, lead code appendix 316 memory MIMO-STS, MIMO-LTS etc.Lead code appendix 316 generates and comprises respectively by the MIMO-STS of a plurality of array configuration and MIMO-LTS, by the burst signal of a plurality of series of the data of at least 1 configuration in a plurality of series.As previously mentioned, data are formed by 2 series.Here, owing to,, give 2 configuration datas in the burst signal of 4 series so dispose MIMO-STS and MIMO-LTS respectively for the burst signal of 4 series with a plurality of serial as " 4 ".Its result is by the burst signal of 4 series of lead code appendix 316 outputs.
Here, the detailed content to MIMO-STS repeats no more.But, for example can stipulate: at least with the burst signal of a plurality of series in a corresponding STS, for the STS corresponding, use at least a portion different subcarriers with other serial burst signal.In addition, can also stipulate that: STS equates with the quantity of each subcarrier that should use of STS, and use different subcarrier.In addition, as previously mentioned, each of the burst signal of a plurality of series is used a plurality of subcarriers, by the MIMO-LTS of the burst signal of a plurality of series configuration, for each series, uses different subcarriers.In other words, carrying out audio frequency interlocks.In addition, can each of the burst signal of a plurality of series be called " burst signal ", be called " burst signal " after also can concluding the burst signal of a plurality of series.Here.Not distinguishing their ground uses.
Spatial dispersion portion 318, for MIMO-LTS in the burst signal of a plurality of series and data, multiply by respectively turn to ranks after, generate and turn to the data till MIMO-LTS that ranks multiply each other and the quantity that is increased to a plurality of series.Here, spatial dispersion portion 318 is before carrying out the multiplication calculation, and the number of times with the data of importing expands to till the quantity of a plurality of series.The number of times of the data of input is " 2 ", here, and with " Nin " representative.Therefore, the data of input can be used the vector representation of " Nin * 1 ".In addition, the quantity of a plurality of series is " 4 ", here, and with " Nout " representative.Spatial dispersion portion 318 expands to Nout with the number of times of the data of input from Nin.In other words, the vector of " Nin * 1 " is expanded to the vector of " Nout * 1 ".At this moment, " 0 " is inserted from Nin+1 is capable play the composition that the Nout behavior ends.
In addition, turn to ranks S to represent with formula.
[formula 7]
S(l)＝C(l)W
Turning to ranks, is the ranks of " Nout * Nout ".In addition, W is the quadrature ranks, is the ranks of " Nout * Nout ".An example of quadrature ranks is Walsh ranks.Here, l representes subcarrier number, with the computing that turns to ranks to multiply each other, subcarrier is carried out as unit.And then C can represent with formula, uses for CDD (Cyclic Delay Diversity).
[formula 8]
C(l)＝diag(1exp(-j2π|δ/Nout)…exp(-j2π|δ(Nout-1)/Nout))
Here, δ representes displacement.In other words; Spatial dispersion portion 318 utilizes each the corresponding displacement with a plurality of series; Circulative time shifting in the MIMO-LTS that will multiply each other with the quadrature ranks is carried out as serial unit, and the circulative time shifting in the data till the quantity that is increased to a plurality of series is carried out as serial unit.In addition, the structure of MIMO-LTS, have with the IEEE802.11a standard in LTS---the structure that Legacy LTS is same.In addition, displacement as unit, is set series for different value.At this moment, with in each corresponding displacements of a plurality of series at least one, be configured to more than the cycle of the regulation that MIMO-STS has.Because the cycle that MIMO-STS has is 1.6 μ s, so at least one in the displacement for example is configured to 1.6 μ s.At this moment, even carry out time shifting, equivalence when also and not being subjected to displacement for MIMO-STS.Therefore, here for the unreal line time displacement of MIMO-STS.Above result, spatial dispersion portion 318 makes the burst signal distortion of a plurality of series.
Radio section 20 is provided with the quantity identical with antenna 12.Radio section 20 sends the burst signal of a plurality of series of distortion.At this moment, Yi Bian radio section 20 makes the burst signal of a plurality of series of distortion corresponding with a plurality of antenna 12, Yi Bian send.In addition, radio section 20 comprises not shown IFFT portion, GI portion, quadrature modulation portion, frequency conversion part, enlarging section.IFFT portion carries out IFFT, and the signal transformation of the frequency field that uses a plurality of subcarriers is become time zone.GI portion gives the data of time zone, and additional mask is interval.Quadrature modulation portion carries out quadrature modulation.The signal that frequency conversion part is crossed quadrature modulation, frequency translation becomes radio-frequency signals.The enlarging section is a power amplifier for amplifying radio-frequency signals.In addition, spatial dispersion portion 318 is arranged on the back level of not shown IFFT portion.
The burst format of the burst signal that generates in Figure 26 (a)-(b) expression communicator 300.Burst format in the burst signal of a plurality of series of Figure 26 (a) expression lead code appendix 316 outputs.Figure 26 (a) is owing to identical with Fig. 3 (b), so repeat no more.Give a plurality of series here,---each additional " 4 " individual MIMO-STS and " 4 " individual MIMO-LTS of the burst signal of " 4 " individual series.On the other hand, at least one in a plurality of series---the data of " 2 " individual series, it is additional then to be used as " the 1st data ", " the 2nd data ".Figure 26 (b) expression is by the burst signal of a plurality of series of spatial dispersion portion 318 distortion.MIMO-STS is identical with Figure 26 (a).The MIMO-LTS of Figure 26 (a) becomes and turns to the ranks multiplied result---" MIMO-LTS ' ".In Figure 26 (b), it is represented as " 1MIMO-LTS ' "～" 4MIMO-LTS ' "." the 1st data " of Figure 26 (a) and " the 2nd data " become and turn to ranks multiplied result---the data of 4 series.In Figure 26 (b), it is represented as " the 1st data "～" the 2nd data ".
After adopting embodiments of the invention; Because even the quantity of the series of data than the quantity of the series of MIMO-LTS after a little while; Also carry out the computing and the circulative time shifting of multiplying each other and handle, so can make the quantity of series of data consistent with the quantity of the series of MIMO-LTS with the quadrature ranks.In addition, because in MIMO-LTS, also carry out and the same processing of DS, so the wireless device that can make communication object uses MIMO-LTS when receiving data.In addition, because in MIMO-STS, do not carry out the processing same,, can improve the receiving feature in the wireless device that becomes communication object so can strengthen the time shifting amount among the CDD with DS.In addition, because from all antenna transmission MIMO-LTS, so the recipient can infer the transmission line of imagination.In addition, even the quantity of the series of data is not equal to the quantity of antenna, also can after the processing of capable factually employing Walsh ranks of logarithm and CDD, send signal from all antennas with omitting.In addition, can also make the electric power of data consistent with MIMO-LTS.
In addition, because MIMO-LTS is also carried out the processing of adopting Walsh ranks and CDD, so the recipient can intactly use the transmission line of inferring according to MIMO-LTS in the reception of data.In addition because to MIMO-LTS and data, adopt very big displacement to carry out CDD after, the electric power difference of MIMO-LTS and data just becomes very little, so can improve the setting accuracy of recipient's AGC.In addition, because can not carry out adopt the time shifting of very big displacement, so after at this moment making MIMO-STS corresponding, can make the electric power of MIMO-STS and MIMO-LTS consistent with all antenna to MIMO-STS.In addition, even MIMO-STS is not carried out the processing of CDD, also can make the electric power of MIMO-STS and MIMO-LTS consistent.In addition, because MIMO-LTS is staggered by audio frequency, so after the processing of adopting Walsh ranks and CDD, during from all antenna transmission MIMO-LTS, also can keep transmission electric power.In addition, in the time of when not carrying out the processing of adopting Walsh ranks and CDD, with the data of 2 series of 3 antenna transmission, each electric power that burst signal is interior is " 3 STS "=" 3 LTS "＞" 2 data ".But when MIMO-LTS and data are adopted the processing of Walsh ranks and CDD, can become " 3 STS "=" 3 LTS "=" 3 data ".
(embodiment 3)
Embodiment 3 is equivalent to make up the embodiment of embodiment 1 and embodiment 2.In other words, wireless device generates the training signal that is made up of embodiment 1 such burst format, is the burst signal of a plurality of series.In addition, wireless device after the computing that turns to ranks of embodiment 2 that kind is multiply by in implementation, makes the burst signal distortion of a plurality of series for the burst signal of a plurality of series that generate.And then wireless device is from the burst signal of a plurality of series of a plurality of antenna transmission distortion.Here, each of the MIMO-STS that wireless device can also comprise the burst signal of a plurality of series, MIMO-LTS, data, carry out multiply by turn to ranks computing.
The wireless device 10 that embodiment 3 relates to is the identical types of the 1st wireless device 10a with Fig. 6.Sending function in the wireless device 10 is the type identical with the dispensing device of Fig. 2 300.Control part 30 and lead code appendix 316 generate and to comprise by the MIMO of at least one configuration in a plurality of series---STS, by the MIMO of each configuration of a plurality of series---LTS and by the burst signal of a plurality of series of the data of same array configuration.In addition, control part 30 and lead code appendix 316 make MIMO, and------part of the array configuration beyond the series of the part of the array configuration of STS and MIMO---are configured MIMO---among LTS STS is configured in the different moment to be configured MIMO among the LTS.Its result, the burst signal of the sort of burst format of generation Figure 21 (a).And then spatial dispersion portion 318 is for the burst signal of a plurality of series that generate, multiply by turn to ranks after, make the burst signal distortion of a plurality of series.318 couples of MIMO of spatial dispersion portion---STS also multiply by and turns to ranks, and to carry out displacement be the time shifting that is worth arbitrarily.Action beyond them, identical with embodiment 2, so repeat no more.
Figure 27 is the figure of the structure of the burst format that relates to of expression embodiments of the invention 3.Figure 27 is equivalent to the burst format as far as the burst signal of a plurality of series of spatial dispersion portion 318 output, and be equivalent to the burst format of Figure 21 (a) with turn to ranks to multiply each other after burst format." 1MIMO-STS ' "～" 3MIMO-STS ' " of Figure 27, be equivalent to Figure 21 (a) " 1MIMO-STS " and " 2MIMO-STS " with turn to ranks to multiply each other after the result.At this moment, turn to ranks to be equivalent to the ranks of " 3 * 3 ", thus in " 1MIMO-STS " and " 2MIMO-STS " of Figure 21 (a), append the row that becomes " 0 " after, just be extended to the vector of " 3 * 1 "." 1MIMO-LTS ' "～" 3MIMO-LTS ' " of Figure 27, be equivalent to Figure 21 (a) " 1MIMO-LTS " and " 2MIMO-LTS " with turn to ranks to multiply each other after the result.In addition, " 4MIMO-LTS ' "～" 6MIMO-LTS ' " of Figure 27, be equivalent to Figure 21 (a) " 3MIMO-LTS " with turn to ranks to multiply each other after the result.Data are identical with embodiment 2.
In addition, the burst format of the burst signal of a plurality of series that in control part 30 and lead code appendix 316, generate also can be corresponding with Figure 22 (a)-(b).These burst format explanation, since identical with embodiment 1, so repeat no more.The computing that turns to ranks multiply by for this burst signal in spatial dispersion portion 318.In addition, the burst signal of above training signal---a plurality of series in embodiment 1, is preferably in the moment transmission of telling about.In other words; Control part 30 for will with and wireless device 10 between the information of the corresponding data transmission rate of wireless transmission link; Offer the transfer rate request signal of this wireless device 10, wireless device 10 also can use training signal when sending the transfer rate request signal that generates.Detailed content, since identical with embodiment 1, so repeat no more.A plurality of antennas 12 among the embodiment 1, be replaced as the burst signal of a plurality of series after, the invention that embodiment 1 records and narrates just can be applied to embodiment 3.In embodiment 3, as previously mentioned, the burst signal that turns to ranks and a plurality of series is multiplied each other, by the signal of a plurality of antennas 12 transmissions with a plurality of series that turn to ranks to multiply each other.
After adopting embodiments of the invention; Because when the wireless device output transfer rate request signal of communication object; Multiply by on one side and turn to ranks; Output on one side is by the MIMO-LTS of a plurality of array configuration, so can obtain the information of the data transmission rate in the wireless device of communication object and according to the information of the newly-generated data transmission rate of MIMO-LTS, improve the precision of information.In addition, with the various burst format of representing among the embodiment 1 and after turning to ranks to multiply each other, the various burst format that can from a plurality of antenna transmission embodiment 1, represent.In addition, the data number is during less than a plurality of antenna number, also can through multiply by turn to ranks after, from a plurality of antenna transmission data.In addition, the data number is during less than a plurality of antenna number, also can through multiply by turn to ranks after, obtain and from the same effect of a plurality of antenna transmission data.
(embodiment 4)
Embodiment 4 relates to embodiment 1～embodiment 3 adaptable burst format.Here, burst format can be used as by the burst signal of antenna output and stipulates as embodiment 1, perhaps as embodiment 2 and 3, can be used as the burst signal that is generated by control part and lead code appendix and stipulates.In addition; The burst format that embodiment 4 relates to is used in the burst signal when sending training signal, but the moment of sending the burst signal of this burst format; Can as embodiment 1, be after having received the train request signal, to have reached to send when the train request signal.
The wireless device that embodiment 4 relates to is identical with the 1st wireless device 10a model of Fig. 6.Tell about 3 kinds of burst format here.Each of 3 kinds of burst format is subdivided into as embodiment 1, when stipulating as the burst signal of being exported by antenna, perhaps as embodiment 2 and 3, when stipulating as the burst signal that is generated by control part and lead code appendix.In addition, also according to the moment segmentation of sending burst signal.Mainly tell about burst format itself here.In addition, for the enforcement of the specifics of sectionalization, carry out according to the record of embodiment 1～3.
3 kinds of burst format, be equivalent to send MIMO-LTS antenna 12 quantity than the quantity of the antenna 12 that should send data for a long time, the quantity of series that perhaps disposes MIMO-LTS is than the quantity variation for a long time of the series of configuration data.It also can be described as the variation of Fig. 3 (b), Figure 19 (a)-(b), Figure 21 (a)-(d), Figure 26 (a).
Tell about the 1st variation.Here, Yi Bian use Figure 19 (a), Yi Bian tell about the 1st variation.In Figure 19 (a), dispose MIMO-LTS accordingly with the 1st antenna 12a～the 3rd antenna 12c, and with the 1st antenna 12a and the 2nd antenna 12b configuration data accordingly.Variation; In the quantity of the antenna that should send MIMO-LTS 12 (following the whole of this antenna 12 or are called " LTS is with antenna 12 ") for a long time, relate to the selection of data with antenna 12 than the quantity of the antenna 12 that should send data (following the whole of this antenna 12 or are called " data are with antenna 12 ").The problem corresponding with this variation is following.In the antenna that does not send data 12, do not send MIMO-LTS yet.Therefore, if the recipient, the signal strength signal intensity of the MIMO-LTS that sends from this antenna 12 when bigger than the change of the signal strength signal intensity of the MIMO-LTS that sends from other antenna 12, just is easy to generate distortion in the MIMO-LTS that receives.Therefore, in data, occur mistake easily, communication quality worsens easily.
The wireless device 10 that variation relates to shown in the step 64 of Figure 11, as unit, is measured the intensity of the signal that receives from the wireless device 10 of communication object with each of a plurality of antennas 12.Here, the mensuration of signal strength signal intensity is not limited to MIMO-STS and the part of MIMO-LTS in the burst signal, can carry out in the part arbitrarily of burst signal.In addition, wireless device 10 is selected in order to send at least one antenna 12 of data from a plurality of antennas 12 according to the intensity of the signal of measuring.The antenna of selecting 12 is equivalent to data with antenna 12.For example, selective reception intensity become the antenna 12 of the 1st and the 2nd big signal.In particular, wireless device 10 is measured the intensity of the signal of the 1st antenna 12a～the 3rd antenna 12c reception.Wireless device 10 is selected the 1st antenna 12a and the 2nd antenna 12b according to the size of measured signal intensity.And then generation and the 1st antenna 12a and the 2nd antenna 12b be the burst signal of configuration data accordingly.Here.Utilize the symmetry of transmit leg and recipient's wireless transmission link
In addition, the 1st variation can be carried out following combination.The antenna of selecting in order to send data 12, the antenna 12 that in embodiment 1, also can be selected in order to send MIMO-LTS comprises.Therefore, also can be adopted by Figure 11, Figure 12.In addition, have the training signal of the burst format of variation,, can after having received the train request signal and when sending the transfer rate request signal, send as embodiment 1.Therefore, also can be adopted by Fig. 4, Fig. 5, Fig. 9～Figure 16.And then the burst format of distortion can also not stipulated with antenna 12 accordingly, and as embodiment 2 and 3, in the burst signal of control part 30 and 316 generations of lead code appendix, stipulates.At this moment, the sending function in the wireless device 10 can be identical model with the dispensing device 300 of Figure 25.In addition, shown in the dispensing device 300 of Figure 25, also can use and turn to ranks.
Below, tell about the 2nd variation.This variation relates to LTS with the quantity of antenna 12 during more than the quantity of antenna 12, the MIMO-LTS that the data in the antenna of being used by LTS 12 are sent with the antenna beyond the antenna 12 12.In addition, the problem for the 2nd variation, also and the problem for the 1st variation explain equally.During Figure 19 (a), so-called " data in the antenna 12 that LTS uses are with the antenna 12 beyond the antenna 12 " is equivalent to the 3rd antenna 12c.
In variation, the amplitude of the 3MIMO-LTS that is sent by the 3rd antenna 12c stipulate than by the 1st antenna 12a and the 1MIMO-LTS of the 1st antenna 12b transmission and the little value of amplitude of 2MIMO-LTS.This is equivalent to 1/2 o'clock of amplitude that the amplitude of 3MIMO-LTS for example becomes 1MIMO-LTS and 2MIMO-LTS.In addition, the 1st antenna 12a and the 1st antenna 12b are equivalent to data with antenna 12.In variation, the amplitude of the 3MIMO-LTS that is sent by the 3rd antenna 12c is diminished after, the signal strength signal intensity of 3MIMO-LTS is diminished.In addition, after the signal strength signal intensity of 3MIMO-LTS diminishes,, the distortion of MIMO-LTS also is not easy to produce even do not give 3MIMO-LTS additional MIMO-STS.In addition, the recipient, after the signal strength signal intensity of the MIMO-LTS that correction diminishes, can infer correct transmission line.
In addition, in the 2nd variation, also can adopt and the 1st the same combination of variation.In other words, for Fig. 3 (b), Figure 19 (a)-(b), Figure 21 (a)-(d), reduce the amplitude of a part of MIMO-LTS after, very effective.In addition, for Figure 26 (a), also can use the 2nd variation.Specifically, for the 2nd variation, also can use and turn to ranks.For example,, use the 2nd variation, use then and turn to ranks if in the burst format of Figure 19 (a), burst format at this moment, just shown in figure 27.
Below, tell about the 3rd variation.The 3rd variation and the 2nd variation are same, relate to LTS with the quantity of antenna 12 during more than the quantity of antenna 12, the MIMO-LTS that the data in the antenna of being used by LTS 12 are sent with the antenna beyond the antenna 12 12.In addition, the problem for the 3rd variation, also and the problem for the 1st variation explain equally.During Figure 19 (a), so-called " data in the antenna 12 that LTS uses are with the antenna 12 beyond the antenna 12 " is equivalent to the 3rd antenna 12c.In variation, the quantity of the subcarrier that uses among the 3MIMO-LTS that will be sent by the 3rd antenna 12c is specified to the little value of quantity than the subcarrier of 1MIMO-LTS that is sent by the 1st antenna 12a and the 1st antenna 12b and 2MIMO-LTS.
This is equivalent in 1MIMO-LTS and 2MIMO-LTS to use " 52 subcarrier " and the situation of in 3MIMO-LTS, using " 26 subcarrier ".In addition, the 1st antenna 12a and the 1st antenna 12b are equivalent to data with antenna 12.In variation, reduce the quantity of the subcarrier that uses among the 3MIMO-LTS after, can reduce the signal strength signal intensity of 3MIMO-LTS.In addition, after the signal strength signal intensity of 3MIMO-LTS diminishes,, the distortion of MIMO-LTS also is not easy to produce even do not give 3MIMO-LTS additional MIMO-STS.In addition, though do not use a part of subcarrier,, after interpolation fills the transmission line of inferring in carrying out through the subcarrier to regulation, but can infer transmission line to all subcarriers the recipient at transmit leg.
In addition, in the 3rd variation, also can adopt and the 1st the same combination of variation.In other words, for Fig. 3 (b), Figure 19 (a)-(b), Figure 21 (a)-(d), do not use a part of subcarrier after, very effective.In addition, for Figure 26 (a), also can use the 3rd variation.Specifically, for the 3rd variation, also can use and turn to ranks.For example,, use the 3rd variation, use then and turn to ranks if in the burst format of Figure 19 (a), burst format at this moment, just shown in figure 27.
After adopting embodiments of the invention; Because when decision should be sent the antenna of MIMO-STS and data; The preferential big antenna of intensity that uses the signal that receives is so during the wireless device received pulse string signal of communication object, the signal strength signal intensity of MIMO-STS can arrive certain degree greatly.Therefore,, the gain of AGC lowly sets to a certain degree, so can reduce the probability of happening of the MIMO-LTS distortion that AGC causes because being become.In addition, because can reduce the probability of happening of the distortion for MIMO-LTS, so can suppress the deterioration of the error rate of data.In addition, because can prevent the deterioration of error rate, so can suppress the deterioration of communication quality.In addition, can correctly carry out inferring of transmission line.In addition, can improve the efficiency of transmission of data.
In addition, littler than other the amplitude of MIMO-LTS because from the amplitude of data with the MIMO-LTS of the antenna transmission beyond the antenna, so, can reduce the probability of happening of the distortion for MIMO-LTS the recipient.In addition, because from the quantity of data, lack than other the quantity of subcarrier of MIMO-LTS, so, can reduce the probability of happening of the distortion for MIMO-LTS the recipient with the subcarrier of the MIMO-LTS of the antenna transmission beyond the antenna.Also can use when in addition, use turns to ranks.
More than, according to embodiment, told about the present invention.This embodiment is example, in their combination of each inscape and each treatment process, various variation can be arranged, and these variation also belong to scope of the present invention.To this, those skilled in the art can admit surely.
In embodiments of the invention 1, select the big antenna 12 of intensity of the signal of quality award from the ministry elder generation selective reception.But be not limited thereto, for example can also derive the delay gap, the preferential little antenna 12 of delay gap of selecting with antenna 12 units.After adopting present embodiment, can preferentially select to postpone the little antenna 12 of influence of ripple.In other words, as long as can preferentially select the good antenna of radio quality 12.
In embodiments of the invention 1, the radical of the antenna 12 that should use when radical that the 1st wireless device 10a sends the antenna 12 that should use when the training signal and the reception training signal is controlled identically.But be not limited thereto, they are controlled differently.In other words, handling part 22 is through the training signal of a plurality of antennas 12 from the 2nd wireless device 10b reception usefulness, at least one antenna 12 that should send training signal that selection portion 28 is selected in a plurality of antennas 12.At this moment, selection portion 28 is according to the training signal of the reception usefulness that receives, and derives each the corresponding radio quality with a plurality of antennas 12, preferentially selects the good antenna of radio quality 12.After adopting present embodiment, can independently set the radical of antenna 12 of radical and the reception of the antenna 12 that sends usefulness.
Make the embodiment of combination of the present invention, also very effective.For example, in an embodiment, from the quantity of the final a plurality of series of sending of radio section 20, according to the record of embodiment 1, quantity that can ratio antenna 12 is few.After adopting this variation, can obtain to make up the effect behind embodiment 1 and the embodiment 2.
Combination arbitrarily for embodiments of the invention 1～4, also very effective.After adopting this variation, can obtain to make up their effect.
After adopting the present invention, can improve the precision of the control when the transmission data.

Claims (11)

1. wireless device is characterized in that possessing:
Generation portion; This generation portion generates the burst signal that comprises MIMO-STS, MIMO-LTS and data; Said MIMO-STS is configured at least one in a plurality of antennas; Said MIMO-LTS is after MIMO-STS and be configured in each in said a plurality of antenna, and said data are after MIMO-LTS and be configured in the antenna that disposes MIMO-STS; With
Sending part, this sending part be through said a plurality of antennas, sends the burst signal that said generation portion generates,
Said generation portion makes the antenna amount that disposes MIMO-STS be less than the antenna amount that disposes MIMO-LTS.
2. wireless device as claimed in claim 1 is characterized in that: also have the configuration part, this configuration part is according to the signal of said a plurality of antennas from the wireless device reception of communication object, and setting is used to send at least one antenna of data,
Said generation portion, at least one antenna that uses said configuration part to set is as at least one antenna of answering configuration data.
3. wireless device as claimed in claim 1; It is characterized in that: in said generation portion; Compare with the signal amplitude of the corresponding part of antenna among the MIMO-LTS, that dispose MIMO-STS; The signal amplitude of the corresponding part of antenna beyond the antenna among the MIMO-LTS, that dispose MIMO-STS is defined as less value.
4. wireless device as claimed in claim 1; It is characterized in that: in said generation portion; Compare with the number of subcarriers that the corresponding part of antenna among the MIMO-LTS, that dispose MIMO-STS is used; The number of subcarriers that the corresponding part of antenna beyond the antenna among the MIMO-LTS, that dispose MIMO-STS is used is defined as less value.
5. a sending method is characterized in that, sends the burst signal that comprises MIMO-STS, MIMO-LTS and data,
Said MIMO-STS is configured at least one in a plurality of antennas, and said MIMO-LTS is after MIMO-STS and be configured in each in said a plurality of antenna, and said data are after MIMO-LTS and be configured in the antenna that disposes MIMO-STS,
Make the antenna amount that disposes MIMO-STS be less than the antenna amount that disposes MIMO-LTS.
6. wireless device is characterized in that possessing:
Generation portion; This generation portion generates the burst signal that comprises MIMO-STS, MIMO-LTS and data; Said MIMO-STS is configured at least one in a plurality of series; Said MIMO-LTS is after MIMO-STS and be configured in each in a plurality of series, said data after MIMO-LTS and with the same array configuration of MIMO-STS; With
Efferent, the burst signal that the output of this efferent generates in said generation portion,
Said generation portion makes the number of series that disposes MIMO-STS be less than the number of series that disposes MIMO-LTS.
7. wireless device as claimed in claim 6 is characterized in that: said generation portion, and make the wireless device of communication object that MIMO-STS is used for AGC, MIMO-LTS is used for transmission line infers.
8. like claim 6 or 7 described wireless devices; It is characterized in that: also have the configuration part; This configuration part is according to the signal of said a plurality of antennas from the wireless device reception of communication object, and setting is used to send at least one antenna of data, each of a plurality of series of said efferent output; Corresponding with each of a plurality of antennas
Said generation portion, the corresponding series of at least one antenna of using said configuration part to set is as at least one series of answering configuration data.
9. like claim 6 or 7 described wireless devices; It is characterized in that: in said generation portion; Compare with signal amplitude among the MIMO-LTS, that be configured in the serial corresponding part that disposes MIMO-STS; Signal amplitude among the MIMO-LTS, that be configured in the serial corresponding part beyond the series that disposes MIMO-STS is defined as less value.
10. like claim 6 or 7 described wireless devices; It is characterized in that: in said generation portion; Compare with the number of subcarriers that part among the MIMO-LTS, that be configured in the series that disposes MIMO-STS is used; The number of subcarriers that part among the MIMO-LTS, that be configured in the series beyond the series that disposes MIMO-STS is used is defined as less value.
11. sending method; It is characterized in that: send the burst signal that comprises MIMO-STS, MIMO-LTS and data; Said MIMO-STS is configured at least one in a plurality of series; Said MIMO-LTS is after MIMO-STS and be configured in each in a plurality of series, said data after MIMO-LTS and be configured in MIMO-STS with in a series of
Make the number of series that disposes MIMO-STS be less than the number of series that disposes MIMO-LTS.
CN200580033853.4A 2004-11-12 2005-11-10 Transmitting and receiving method, and radio apparatus utilizing the same Active CN101036334B (en)

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