CN1738301A - Pilot symbol transmission for multiple-transmit communication systems - Google Patents
Pilot symbol transmission for multiple-transmit communication systems Download PDFInfo
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- CN1738301A CN1738301A CN 200510088315 CN200510088315A CN1738301A CN 1738301 A CN1738301 A CN 1738301A CN 200510088315 CN200510088315 CN 200510088315 CN 200510088315 A CN200510088315 A CN 200510088315A CN 1738301 A CN1738301 A CN 1738301A
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Abstract
Disclosed is a network device for transmitting a set of known pilot symbols in a communications system utilizing a plurality of transmit sources. The network device includes generating means for generating the set of known pilot symbols to be transmitted for each of the plurality of transmit sources and inserting means for inserting pilot symbols for each of the plurality of transmit sources. The network device also includes creating means for creating a near to full orthogonal matrix over time and frequency using the fewest number of pilot symbols. The pilot symbols are used for at least one of channel, frequency, and phase tracking at a receiving station.
Description
Technical field
The present invention relates to emission source identification and correlation detection in multiple-transmit communication systems.
Background technology
Wireless communication system can be realized polytype communication.A kind of radio communication between single transmit machine and single-receiver is that known singly go out singly (SISO) communicates by letter.Transmitter comprises an antenna that is used to launch radio frequency (RF) signal, and one or more antenna that this radiofrequency signal is received machine receives.When receiver comprised two or more antennas, receiver selected one of them to receive the radiofrequency signal that enters.Another radio communication is multiple-input, multiple-output (MIMO) communications.In mimo wireless communication, transmitter and receiver all contains mulitpath.In such communication, transmitter utilizes space-time code mechanism parallel processing data, to produce two or more data flow.Transmitter comprises a plurality of transmission paths, each data flow is converted to a plurality of RF signals.Receiver receives a plurality of RF signals by the multi-receiver path, utilizes space-time decoding mechanism to catch data flow again.The data flow of catching is again merged, and handles subsequently to revert to initial data.
Different radio equipment in the wireless communication system can be followed the different editions of various criterion or identical standard.For example, IEEE 802.11a, the extended version of IEEE 802.11 provides transmission rate up to 54Mbps in the 5GHz frequency range.IEEE 802.11g, another extended version of IEEE 802.11 provides transmission rate above 20Mbps in the 2.4GHz frequency range.The equipment of following IEEE 802.11a and IEEE802.11g standard simultaneously adopts OFDM (OFDM) encoding scheme.OFDM is a kind of frequency division multiplexing modulation technique, is used at the radio wave transferring large number of data.OFDM is by decomposing individual traffic work on the subcarrier frequency range, and each subcarrier is by parallel emission.In IEEE 802.11a that in following ieee standard, defines and the equipment of IEEE 802.11g, have only 52 to be used in 64 active sub-carriers.It is the pilot subcarriers that comprise known pilot symbols that 4 active subcarriers are arranged, and utilizes these frequency pilot sign receiving stations to follow the trail of channel, frequency and/or phase place.Remaining 48 subcarrier is for providing the wireless path of many separation with parallel mode transmission information.
Current frequency pilot sign emission is used for the single transmit chain.In order to realize that frequency pilot sign is applied in a plurality of channels, identical frequency pilot sign should be applied on all transmission paths.Therefore, frequency pilot sign need be launched by a plurality of emission sources or transmitter.
Summary of the invention
According to an aspect of the present invention, provide a kind of network equipment that is used in one group of known pilot symbols of communication system emission.The described network equipment comprises that each that be used in the multichannel emission source generates one group of known generating apparatus that will the pilot transmitted symbol; Be used in the multichannel emission source each that frequency pilot sign is inserted into insertion device in the subcarrier; The generation device that is used to approximate full orthogonal matrix (near to full orthogonal matrix) on the time that is created in and the frequency; One of below wherein, receiving station is applied to described frequency pilot sign at least: channel, frequency and phase tracking.
According to a further aspect in the invention, also provide a kind of method that is used in one group of known pilot symbols of communication system emission.This method be included as in the multichannel emission source each generate one group known will the pilot transmitted symbol and frequency pilot sign is inserted into step in the subcarrier in the multichannel emission source each.One of described method is further comprising the steps of: utilize the frequency pilot sign of minimum number to be created in approximate full orthogonal matrix on time and the frequency, below receiving station is applied to described frequency pilot sign at least: channel, frequency and phase tracking.
According to the present invention, a kind of network equipment that is used in one group of known pilot symbols of communication system emission is provided, comprising:
Be used in the multichannel emission source each to generate one group of known generating apparatus that will the pilot transmitted symbol;
Be used in the multichannel emission source each that frequency pilot sign is inserted into insertion device in the subcarrier;
The generation device that is used to approximate full orthogonal matrix on the time that is created in and the frequency;
One of below wherein, receiving station is applied to described frequency pilot sign at least: channel, frequency and phase tracking.
As preferably, each that described insertion device is the multichannel emission source is inserted the frequency pilot sign of weighting.
As preferably, when described multichannel emission source comprises two emission sources and two known pilot symbols of each emission source emission, when n was integer, for symbol 2n-1, value among the last vector p1 of described multichannel emission source pilot symbol transmitted collection # 1 and set of pilot symbols #2 went up the value among the vector p2; For symbol 2n, value among the last vector p2 of multichannel emission source emission set of pilot symbols # 1 and set of pilot symbols #2 go up the value among the vector p1;
Wherein p1 equal+1 ,+1 and p2 equal+1 ,-1.
As preferably, when described multichannel emission source comprised three emission sources and two known pilot symbols of each emission source emission, when n was integer, for symbol 2n-1, the emission of multichannel emission source: if n is an even number, set of pilot symbols # 1 went up the value among the vector p1; If n is an odd number, set of pilot symbols # 1 goes up the value among the vector p2; If n is an odd number, set of pilot symbols #2 goes up the value among the vector p2; If n is an even number, set of pilot symbols #2 goes up the value among the vector p1; For symbol 2n, the emission of multichannel emission source: if n is an odd number, set of pilot symbols # 1 goes up the value among the vector p3; If n is an even number, set of pilot symbols # 1 goes up the value among the vector p4; If n is an odd number, the value among the vector p4 of set of pilot symbols #2; If n is an even number, set of pilot symbols #2 goes up the value among the vector p3;
Wherein p1 equal+1 ,+1 ,-1; P2 equals+and 1 ,-1 ,+1; P3 equals-1 ,+1 ,+1; P4 equals-1 ,-1 ,-1.
As preferably, when described multichannel emission source comprised four emission sources and two known pilot symbols of each emission source emission, when n was integer, for symbol 2n-1, if n is an odd number, multichannel emission source emission set of pilot symbols # 1 went up the value among the vector p1; If n is an even number, set of pilot symbols # 1 goes up the value among the vector p2; If n is an odd number, set of pilot symbols #2 goes up the value among the vector p2; If n is an even number, set of pilot symbols #2 goes up the value among the vector p1; For symbol 2n, if n is an odd number, multichannel emission source emission set of pilot symbols # 1 goes up the value among the vector p3; If n is an even number, set of pilot symbols # 1 goes up the value among the vector p4; If n is an odd number, set of pilot symbols #2 goes up the value among the vector p4; If n is an even number, set of pilot symbols #2 goes up the value among the vector p3;
Wherein p1 equal+1 ,+1 ,+1 ,-1; P2 equals+and 1 ,+1 ,-1 ,+1; P3 equals+and 1 ,-1 ,+1 ,+1; P4 equals-1 ,+1 ,+1 ,+1.
As preferably, above-mentioned generating apparatus be configured to in the multichannel emission source each generate four known to the frequency pilot sign that is launched, wherein, four known frequency pilot signs are launched in the section at one time.
As preferably, the polarity of known frequency pilot sign is changed, so that the emission source of correct each known pilot symbols of sign of different emission functions.
As preferably, the described network equipment also comprises when number of pilot symbols is less than transmitter quantity, in time with the dispensing device of subclass mode pilot symbol transmitted.
As preferably, the described network equipment can be configured, to use any subclass of the frequency pilot sign that generates.
As preferably, launch one group of 8 frequency pilot sign in the multichannel emission source each, wherein in order to keep multi channel robustness, set of pilot symbols recycles symbol.
As preferably, section is by intersecting the frequency pilot sign index in time, in the multichannel emission source each rotated (the set of pilot symbols for each of the pluralityof transmit sources is rotated across a pilot index over a period oftime) to set of pilot symbols.
As preferably, when multichannel emission source quantity equaled two, set of pilot symbols was by every symbol exchange, to keep the robustness of channel.
As preferably, when multichannel emission source quantity equaled three or four, set of pilot symbols was by every pair of symbol exchange, to keep the robustness of channel.
As preferably, for a given number of pilot symbols, set of pilot symbols can comprise weighting at the most, and its polarity is opposite with other set of pilot symbols.
As preferably, described insertion device is that in the multichannel emission source each is inserted the frequency pilot sign (the inserting means inserts scaled pilot symbols for eachof the plurality of transmit sources) through convergent-divergent (scaled).
As preferably, described insertion device reorders at least to frequency pilot sign or changes the operation of sequence by intersecting a plurality of emission sources and the pilot tone index that intersects.
As preferably, insert device and be in the multichannel emission source each and insert frequency pilot sign through convergent-divergent, wherein, the frequency pilot sign that described each frequency pilot sign is concentrated carries out convergent-divergent by a time dependent complex value
As preferably, insert device and be in the multichannel emission source each and insert frequency pilot sign through convergent-divergent, wherein, the frequency pilot sign that described each frequency pilot sign is concentrated carries out convergent-divergent by time dependent different complex values.
According to an aspect of the present invention, provide a kind of method that is used in one group of known pilot symbols of communication system emission, comprise the steps:
For in the multichannel emission source each generate one group known will the pilot transmitted symbol;
For in the multichannel emission source each is inserted into frequency pilot sign in the subcarrier;
Utilize the frequency pilot sign of minimum number to be created in approximate full orthogonal matrix on time and the frequency;
One of below receiving station is applied to described frequency pilot sign at least: channel, frequency and phase tracking.
As selection, described inserting step is included as the frequency pilot sign of each the insertion weighting in the multichannel emission source.
As selection, described inserting step is included as in the multichannel emission source each and inserts frequency pilot sign through convergent-divergent.
As preferably, described inserting step comprises by intersecting a plurality of transmitters and the pilot tone index that intersects and frequency pilot sign is reordered at least or changes the operation of sequence.
As preferably, described inserting step is included as in the multichannel emission source each and inserts frequency pilot sign through convergent-divergent, and wherein, the frequency pilot sign that described each frequency pilot sign is concentrated carries out convergent-divergent by a time dependent complex value.
Description of drawings
In order further to deepen the understanding of the present invention, by embodiment principle of the present invention is described in further details below in conjunction with accompanying drawing.
Shown in Figure 1 is the schematic diagram of communication system, wherein comprises a plurality of base stations, a plurality of Wireless Telecom Equipments and network hardware component;
Be to have two transmitters and each transmitter to send under the situation of two pilot signals two transmitter frequency pilot sign standard specification shown in Fig. 2 a) example;
Be to have three transmitters and each transmitter to send under the situation of two pilot signals the example of three transmitter frequency pilot sign standards (specification) shown in Fig. 2 b;
Be to have four transmitters and each transmitter to send under the situation of two pilot signals the example of four transmitter frequency pilot sign standards (specification) shown in Fig. 2 c;
Fig. 3 a is depicted as the situation of 4 frequency pilot signs of 1 transmitter emission;
Fig. 3 b is depicted as the situation of 4 frequency pilot signs of 2 transmitter emissions;
Fig. 3 c is depicted as the situation of 4 frequency pilot signs of 3 transmitter emissions;
Fig. 3 d is depicted as the situation of 4 frequency pilot signs of 4 transmitter emissions;
Fig. 4 a is depicted as the situation of 8 frequency pilot signs of 1 transmitter emission;
Fig. 4 b is depicted as the situation of 8 frequency pilot signs of 2 transmitter emissions;
Fig. 4 c is depicted as the situation of 8 frequency pilot signs of 3 transmitter emissions;
Fig. 4 d is depicted as the situation of 8 frequency pilot signs of 4 transmitter emissions;
Fig. 5 a is depicted as under the situation of two transmitters, be to keep robustness (robustness), the matrix example that every pair of symbol of set of pilot symbols is exchanged
Fig. 5 b is depicted as under the situation of three transmitters, be to keep robustness (robustness), the matrix example that every pair of symbol of set of pilot symbols is exchanged;
Fig. 5 c is depicted as under the situation of four transmitters, be to keep robustness (robustness), the matrix example that every pair of symbol of set of pilot symbols is exchanged.
Embodiment
Below preferred embodiments more of the present invention are introduced, wherein each example is all shown in the drawings.
Figure 1 shows that the schematic diagram of communication system 10, comprise a plurality of base stations and/or access point 12-16 in the system 10, a plurality of Wireless Telecom Equipment 18-32 and a network hardware component 34.Wireless Telecom Equipment 18-32 can be notebook computer 18 and 26, personal digital assistant main frame 20 and 30, PC 24 and 32 and/or cell phone 22 and 28.Base station or access point 12-16 are operably connected to the network hardware 34 by local area network (LAN).The network hardware 34, for example router, switch, bridge, modulator-demodulator or system controller are for communication system 10 provides the wide area network connection.Each base station or access point 12-16 have the antenna or the antenna array of an association, in order to communicate by letter with other Wireless Telecom Equipments in its coverage.Usually, Wireless Telecom Equipment is in a specific base stations or the registration of access point 12-14 place, to receive the service from communication system 10.Each Wireless Telecom Equipment comprises built-in radio receiver-transmitter or is connected to related radio receiver-transmitter.Radio receiver-transmitter comprises at least one radio frequency (RF) transmitter and at least one radio-frequency transmitter.
Each Wireless Telecom Equipment that participates in radio communication comprises a built-in wireless set (Receiver And Transmitter just) or is connected to related wireless set.As is known to the person skilled in the art, transmitter generally all comprises data-modulated level, one or more intermediater-frequency stage and power amplifier.The data-modulated level is converted to baseband signal according to specific wireless communication standard with initial data.Intermediater-frequency stage is carried out mixing to produce radiofrequency signal with baseband signal and one or more oscillation signals according.Before signal was launched by antenna, power amplifier amplified this radiofrequency signal.
Receiver generally links to each other with antenna, and comprises low noise amplifier, one or more intermediater-frequency stage, filtering stage and data recovery level.Low noise amplifier receives the radiofrequency signal enter the station by antenna and with its amplification.Intermediater-frequency stage is carried out mixing by the RF signal that will amplify and the oscillator signal of one or more machines, radiofrequency signal is converted to baseband signal or intermediate frequency (IF) signal.Filtering stage is carried out filtering to weaken useless out of band signal to baseband signal or intermediate frequency (IF) signal, produces filtering signal.Data are recovered level and are recovered initial data according to specific wireless communication standard from filtering signal.
According to one embodiment of present invention, utilize one group of known frequency pilot sign to discern a plurality of emission sources.Known pilot signal/symbol or a plurality of known signal can be inserted in the data flow.Thereby, the present invention relates to use the transmission of the frequency pilot sign in the communication system of many emission sources or multi-transmitter, and utilize known frequency pilot sign to identify the method for a plurality of emission sources.Frequency pilot sign is used in the communication of multiple jet, and be used for receiving station to channel, frequency and or/phase tracking.Therefore, in one embodiment of the invention, select for use frequency pilot sign so that outstanding performance to be provided in dissimilar channels.
In one embodiment of the present of invention, be created in the approximate full orthogonal matrix on time and the frequency.The uncorrelated phase noise (uncorrelated phasenoise) that the present invention has related in transmitter and the signal is equally revised.As described below, when number of pilot symbols was less than transmitter quantity, frequency pilot sign can send in the subclass mode in time.When having multiple transmitter, the embodiments of the invention utilization is inserted the method for weighted pilot symbols and is discerned each transmitter.For example, signal can comprise the polarity relevant with the change of transmitter or other configurations and transform, with the source of a signal specific of correct sign.
Under two transmitter pilot tone standards (specification) situation, when at 2 frequency pilot signs of each transmitter emission, at n=1,2 ... for symbol 2n-1, transmitter 1-2 sends the value among the vector p1 on the set of pilot symbols # 1 shown in Fig. 2 a in subcarrier #-21; In subcarrier #21, send simultaneously the value among the vector p2 on the set of pilot symbols #2.Work as n=1,2 ..., for symbol 2n, transmitter 1-2 sends the value among the vector p2 on the set of pilot symbols # 1 in subcarrier #-21, and sends the value among the vector p1 on the set of pilot symbols #2 in subcarrier #21.According to this embodiment, the phase noise correction of two transmitters (phase noise correction) bandwidth remains on 1/Tsym.Intersymbol phase error can be incoherent.Fig. 2 a shows two transmitter 202-204 and each transmitter sends under the situation of 2 frequency pilot signs, the example of two transmitter pilot tone standards.Shown in Fig. 2 a, transmitter 202 in a period of time, emission value [+1+1] in a symbol; Transmitter 204 in a period of time, emission value [+1-1] in a symbol.
Under three transmitter frequency pilot sign standard situations, when 2 frequency pilot signs of each transmitter emission, at n=1,2 ... for symbol 2n-1, if n is an odd number, transmitter 1-3 sends the value among the vector p1 on the set of pilot symbols #1 shown in Fig. 2 b in subcarrier #-21; If n is an even number, in subcarrier #-21, send the value among the vector p2 on the set of pilot symbols #1.If n is an odd number, in subcarrier #+21, send the value among the vector p2 on the set of pilot symbols #2; If n is an even number, in subcarrier #+21, send the value among the vector p1 on the set of pilot symbols #2.Work as n=1,2 ..., for symbol 2n, if n is an odd number, transmitter 1-3 sends the value among the vector p3 on the set of pilot symbols #1 shown in Fig. 2 b in subcarrier #-21; If n is an even number, in subcarrier #-21, send the value among the vector p4 on the set of pilot symbols #1.If n is an odd number, in subcarrier #+21, send the value among the vector p4 on the set of pilot symbols #2; If n is an even number, in subcarrier #+21, send the value among the vector p3 on the set of pilot symbols #2.Fig. 2 b shows 3 transmitter 206-210 and each transmitter sends in each time period under the situation of 2 frequency pilot signs, the example of three transmitter pilot tone standards.Shown in Fig. 2 b, transmitter 206 is in very first time section, emission value [+1+1] in first symbol, and in second time period, emission value [1-1] in second symbol.Similar, transmitter 208 is in very first time section, emission value [+1-1] in first symbol, and in second time period, emission value [+1-1] in second symbol.Transmitter 210 is in very first time section, emission value [1+1] in first symbol, and in second time period, emission value [+1-1] in second symbol.
Under four transmitter frequency pilot sign standard situations, when 2 frequency pilot signs of each transmitter emission, at n=1,2 ... for symbol 2n-1, if n is an odd number, transmitter 1-4 sends the value among the vector p1 on the set of pilot symbols #1 shown in Fig. 2 c in subcarrier #-21; If n is an even number, in subcarrier #-21, send the value among the vector p2 on the set of pilot symbols #1.If n is an odd number, in subcarrier #+21, send the value among the vector p2 on the set of pilot symbols #2; If n is an even number, in subcarrier #+21, send the value among the vector p1 on the set of pilot symbols #2.Work as n=1,2 ..., for symbol 2n, if n is an odd number, transmitter 1-4 sends the value among the vector p3 on the set of pilot symbols #1 in subcarrier #-21; If n is an even number, in subcarrier #-21, send the value among the vector p4 on the set of pilot symbols #1.If n is an odd number, in subcarrier #+21, send the value among the vector p4 on the set of pilot symbols #2; If n is an even number, in subcarrier #+21, send the value among the vector p3 on the set of pilot symbols #2.Fig. 2 c shows 4 transmitter 212-218 and each transmitter sends under the situation of 2 frequency pilot signs, the example of 4 transmitter pilot tone standards.Shown in Fig. 2 c, transmitter 212 is in very first time section, emission value [+1+1] in first symbol, and in second time period, emission value [+1-1] in second symbol.Similar, transmitter 214 is in very first time section, emission value [+1+1] in first symbol, and in second time period, emission value [1+1] in second symbol.Transmitter 216 is in very first time section, emission value [+1-1] in first symbol, and in second time period, emission value [+1+1] in second symbol.Transmitter 218 is in very first time section, emission value [1+1] in first symbol, and in second time period, emission value [+1+1] in second symbol.
According to the embodiment shown in Fig. 2 b and the 2c, the phase noise correction bandwidth of three and four transmitters drops to has only 1/2Tsym.
According to one embodiment of present invention, each antenna can be launched nearly 4 frequency pilot signs.Fig. 3 a is depicted as the situation of 4 frequency pilot signs of a transmitter 302 emissions.Fig. 3 b is depicted as the situation of 4 frequency pilot signs of 2 transmitter 304-306 emissions.Fig. 3 c is depicted as the situation of 4 frequency pilot signs of 3 transmitter 308-312 emissions.Fig. 3 d is depicted as the situation of 4 frequency pilot signs of 4 transmitter 314-320 emissions.According to Fig. 3 a to 3d,, in a period of time, in a symbol, launch from the set of pilot symbols of each transmitter 302-320.Like this, the matrix among Fig. 3 a-3d is at an isolated sign.In addition, shown in Fig. 3 a and 3d, the row in these matrixes can be in the symbol cocycle, with the maintenance robustness under the multichannel situation.
According to one embodiment of present invention, each antenna can be launched nearly 8 frequency pilot signs.Fig. 4 a is depicted as the situation of 8 frequency pilot signs of a transmitter 402 emissions.Fig. 4 b is depicted as the situation of 8 frequency pilot signs of 2 transmitter 404-406 emissions.Fig. 4 c is depicted as the situation of 8 frequency pilot signs of 3 transmitter 408-412 emissions.Fig. 4 d is depicted as the situation of 8 frequency pilot signs of 4 transmitter 414-420 emissions.According to Fig. 4 a to 4d,, in a period of time, in a symbol, launch from the set of pilot symbols of each transmitter 402-420.Like this, the matrix among Fig. 4 a-4d is at an isolated sign.In addition, shown in Fig. 4 a and 4d, the row in these matrixes can be in the symbol cocycle, to keep robustness under the multichannel situation.
As described below, to each transmitter, set of pilot symbols can be rotated (rotated across the pilot indices over time) by intersecting the frequency pilot sign index in time.Fig. 5 a-5c is depicted as the matrix example, and wherein set of pilot symbols is exchanged, to keep robustness in multichannel.At multichannel, in order to keep robustness, for 2 transmitters, set of pilot symbols can exchange by each symbol, or for 3-4 transmitter, set of pilot symbols can exchange by every pair of symbol.
Fig. 5 a shows at 2 transmitters, and the matrix that the set of pilot symbols shown in Fig. 2 a is changed by each symbol is to keep robustness.Like this, transmitter 202 in a time period in second symbol emission value [+1+1], transmitter 204 in a time period in second symbol emission value [1+1].
Fig. 5 b shows at 3 transmitters, and the matrix that the set of pilot symbols shown in Fig. 2 b is changed by every pair of symbol is to keep robustness.Therefore, transmitter 206 is emission value [+1+1] in three symbols of very first time Duan Zaidi, in second time period emission value [1-1] in the 4th symbol.Similar, transmitter 208 is emission value [1+1] in three symbols of very first time Duan Zaidi, in second time period emission value [1+1] in the 4th symbol.Transmitter 210 is emission value [+1-1] in three symbols of very first time Duan Zaidi, in second time period emission value [1+1] in the 4th symbol.
Fig. 5 c shows at 4 transmitters, and the matrix that the set of pilot symbols shown in Fig. 2 c is changed by every pair of symbol is to keep robustness.In Fig. 5 c, transmitter 212 is emission value [+1+1] in three symbols of very first time Duan Zaidi, in second time period emission value [1+1] in the 4th symbol.Similar, transmitter 214 is emission value [+1+1] in three symbols of very first time Duan Zaidi, in second time period emission value [+1-1] in the 4th symbol.Transmitter 216 is emission value [1+1] in three symbols of very first time Duan Zaidi, in second time period emission value [+1+1] in the 4th symbol.Transmitter 218 is emission value [+1-1] in three symbols of very first time Duan Zaidi, in second time period emission value [+1+1] in the 4th symbol.
In addition, utilize in different time situation (time instances) to different frequency pilot signs by turns, transmitter can correctly be discerned various frequency pilot signs.For explaining the problem of rotating about set of pilot symbols or frequency pilot sign, an important content is exactly: for any amount of transmitter and any amount of frequency pilot sign, set of pilot symbols is rotated (rotated acrossthe pilot indices) by intersection frequency pilot sign index; Therefore, first set of pilot symbols can become second set of pilot symbols, and second set of pilot symbols can become the 3rd set of pilot symbols or the like.Launch under the situation of all set of pilot symbols in a plurality of time situations of needs (timeinstances), after set of pilot symbols occurs in each group time situation (time instances) by turns.For example, 2 time situations (timeinstances) are launched a set of pilot symbols if desired, and per 2 the time situations of set of pilot symbols (timeinstances) by turns once so.
It should be noted that in an example of the present invention, for given number of pilot symbols, set of pilot symbols can comprise a weighting at most, its polarity is opposite with other.When transmitter quantity is a lot, for example, under four situation, can use this technology.Set of pilot symbols can be considered to be in the one deck on this method of weighting by turns, is applied to transmitter quantity too more for a long time, for example, and under four situation.Therefore, the present invention makes that also pilot signal can be in more efficient utilization in the multi-transmitter configuration, for the coherent detection of error provides extra flexibility.The inventive method of penetrating emission frequency pilot sign on the path at pilosity makes receiver can use frequency pilot sign to follow the trail of channel variation, frequency change and/or phase change (as previously mentioned).On all transmission paths, use identical frequency pilot sign to eliminate this additional flexibility.By using structure or specific set of pilot symbols, the present invention can penetrate channel, frequency and/or the phase tracking of signal with respect to pilosity.
More than disclosed structure and/or weighting, in conjunction with time-based set of pilot symbols by turns, realize multiple penetrate path tracing in, the traceable correlation between frequency pilot sign is provided.Except weighting discussed above, the set of pilot symbols of appointment can be passed through complex value (complex value) proportional convergent-divergent (scaled).The set of pilot symbols of appointment also can reorder and/or changes sequence by intersecting (across) transmitter and intersection (across) frequency pilot sign.In addition, the set of pilot symbols of appointment can be carried out convergent-divergent (scaled) by a complex value that changes in time and/or repeat (complex value).And each frequency pilot sign that frequency pilot sign is concentrated can carry out convergent-divergent by possible different complex values (complexvalue), and this convergent-divergent (scaling) can change in time.Should be noted that, the invention provides application any subclass of set of pilot symbols among Fig. 2-5.For example, relate to 8 frequency pilot signs and 4 transmitters among Fig. 4 d, if 6 frequency pilot signs are used for 3 transmitters, use 414,416,418 row of matrix, first and second, four, five, seven row, can produce a set of pilot symbols matrix, 3 * 6 wherein final matrixes will be:
Describe with IEEETM802.11a and 802.11g although those skilled in the art will realize that example of the present invention, the method for introducing in the invention also can be used in the equipment of any realization OFDM coding.Aforesaid explanation directly applies to specific embodiment of the present invention.Obviously, can change and revise described embodiment, with the advantage that realizes that it is part or all of.Therefore, the target of claim is to cover this all class that belongs within connotation of the present invention and the scope to change and modification.
It is 60/591,096 that the application requires application number, and the applying date is the priority of the U.S. Provisional Patent Application on July 27th, 2004, and the present specification reference also combines its content.
Claims (10)
1, a kind of network equipment that is used in one group of known pilot symbols of communication system emission comprises:
Be used in the multichannel emission source each to generate one group of known generating apparatus that will the pilot transmitted symbol;
Be used in the multichannel emission source each that frequency pilot sign is inserted into insertion device in the subcarrier;
The generation device that is used to approximate full orthogonal matrix on the time that is created in and the frequency;
One of below wherein, receiving station is applied to described frequency pilot sign at least: channel, frequency and phase tracking.
2, the network equipment that is used in one group of known pilot symbols of communication system emission according to claim 1, wherein, described insertion device is the frequency pilot sign of each the insertion weighting in the multichannel emission source.
3, the network equipment that is used in one group of known pilot symbols of communication system emission according to claim 2, wherein, when described multichannel emission source comprises two emission sources and two known pilot symbols of each emission source emission, when n is integer, for symbol 2n-1, value among the last vector p1 of described multichannel emission source pilot symbol transmitted collection #1 and set of pilot symbols #2 go up the value among the vector p2; For symbol 2n, value among the last vector p2 of multichannel emission source emission set of pilot symbols #1 and set of pilot symbols #2 go up the value among the vector p1;
Wherein p1 equal+1 ,+1 and p2 equal+1 ,-1.
4, according to claim 2 being used in the network equipment of one group of known pilot symbols of communication system emission, wherein, when described multichannel emission source comprises three emission sources and two known pilot symbols of each emission source emission, when n is integer, for symbol 2n-1, if n is an even number, multichannel emission source emission set of pilot symbols #1 goes up the value among the vector p1; If n is an odd number, set of pilot symbols #1 goes up the value among the vector p2; If n is an odd number, set of pilot symbols #2 goes up the value among the vector p2; If n is an even number, set of pilot symbols #2 goes up the value among the vector p1; For symbol 2n, the emission of multichannel emission source: if n is an odd number, set of pilot symbols #1 goes up the value among the vector p3; If n is an even number, set of pilot symbols #1 goes up the value among the vector p4; If n is an odd number, the value among the vector p4 of set of pilot symbols #2; If n is an even number, set of pilot symbols #2 goes up the value among the vector p3;
Wherein p1 equal+1 ,+1 ,-1; P2 equals+and 1 ,-1 ,+1; P3 equals-1 ,+1 ,+1; P4 equals-1 ,-1 ,-1.
5, according to claim 2 being used in the network equipment of one group of known pilot symbols of communication system emission, wherein, when described multichannel emission source comprises four emission sources and two known pilot symbols of each emission source emission, when n is integer, for symbol 2n-1, if n is an odd number, multichannel emission source emission set of pilot symbols #1 goes up the value among the vector p1; If n is an even number, set of pilot symbols #1 goes up the value among the vector p2; If n is an odd number, set of pilot symbols #2 goes up the value among the vector p2; If n is an even number, set of pilot symbols #2 goes up the value among the vector p1; For symbol 2n, if n is an odd number, multichannel emission source emission set of pilot symbols #1 goes up the value among the vector p3; If n is an even number, set of pilot symbols #1 goes up the value among the vector p4; If n is an odd number, set of pilot symbols #2 goes up the value among the vector p4; If n is an even number, set of pilot symbols #2 goes up the value among the vector p3;
Wherein p1 equal+1 ,+1 ,+1 ,-1; P2 equals+and 1 ,+1 ,-1 ,+1; P3 equals+and 1 ,-1 ,+1 ,+1; P4 equals-1 ,+1 ,+1 ,+1.
6, a kind of method that is used in one group of known pilot symbols of communication system emission comprises the steps:
For in the multichannel emission source each generate one group known will the pilot transmitted symbol;
For in the multichannel emission source each is inserted into frequency pilot sign in the subcarrier;
Utilize the frequency pilot sign of minimum number to be created in approximate full orthogonal matrix on time and the frequency;
One of below receiving station is applied to described frequency pilot sign at least: channel, frequency and phase tracking.
7, a kind of method that is used in one group of known pilot symbols of communication system emission according to claim 6, wherein, described inserting step is included as the frequency pilot sign of each the insertion weighting in the multichannel emission source.
8, a kind of method that is used in one group of known pilot symbols of communication system emission according to claim 6, wherein, described inserting step is included as in the multichannel emission source each and inserts frequency pilot sign through convergent-divergent.
9 a kind of methods that are used in one group of known pilot symbols of communication system emission according to claim 6, wherein, described inserting step comprises by intersecting a plurality of transmitters and the pilot tone index that intersects and frequency pilot sign is reordered at least or changes the operation of sequence.
10, a kind of method that is used in one group of known pilot symbols of communication system emission according to claim 6, wherein, described inserting step is included as in the multichannel emission source each and inserts frequency pilot sign through convergent-divergent, wherein, the concentrated frequency pilot sign of described each frequency pilot sign carries out convergent-divergent by a time dependent complex value.
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| US59109604P | 2004-07-27 | 2004-07-27 | |
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| US60/634,101 | 2004-12-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101141428B (en) * | 2006-09-06 | 2011-05-04 | 上海贝尔阿尔卡特股份有限公司 | Pilot encoding method and device for orthogonal frequency division multiplexing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101141428B (en) * | 2006-09-06 | 2011-05-04 | 上海贝尔阿尔卡特股份有限公司 | Pilot encoding method and device for orthogonal frequency division multiplexing system |
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