CN100502376C

CN100502376C - Apparatus and method and for generating an orthogonal frequency division multiplexing (OFDM) frame for wireless communications

Info

Publication number: CN100502376C
Application number: CNB2004100695740A
Authority: CN
Inventors: 克里斯多佛·哈森; 特伯·慕塔; 贾森·切思戈
Original assignee: Zyray Wireless Inc
Current assignee: Broadcom Corp; Zyray Wireless Inc
Priority date: 2003-07-18
Filing date: 2004-07-19
Publication date: 2009-06-17
Anticipated expiration: 2024-07-19
Also published as: TWI261429B; TW200531465A; CN1625163A

Abstract

A method for generating an orthogonal frequency division multiplexing (OFDM) frame for wireless communications begins by generating a preamble of the OFDM frame, wherein the preamble includes training information and signal information. The method continues by generating a plurality of data fields of the OFDM frame, wherein each of the plurality of data fields includes a plurality of subcarriers, wherein at least some of the plurality of data fields includes, at most, three of the plurality of subcarriers allocated for a pilot signal.

Description

Produce the equipment and the method for OFDM frames in the wireless telecommunications

Technical field

The present invention relates to wireless telecommunication system, particularly the different-format between wireless telecommunications system branch and wireless telecommunication system.

Background technology

The mechanics of communication that is connected with in the network of electronic equipment is known.The object lesson of communication network comprises wired packet data network, wireless packet data networks, wired telephone network, wireless telephony network and satellite communication network etc.Usually these communication networks are included as the network architecture that a plurality of customer equipments provide service.Public switch telephone network (PSTN) may be the example of the communication network known the most, and it has occurred a lot of years.The Internet (Internet) is the example of another communication network of knowing, and it also occurs for many years.These communication networks can make customer equipment communicate with one another in the world.Cable LAN (LAN) is also very common as Ethernet, and it can support the network computer in the coverage and the communication of other equipment.Local area network (LAN) usually also with wide area network and Internet connection.In these networks each is considered to the network of " wired " usually, even some network as PSTN, may comprise the transmission channel that can be used for wireless connections.

Compare with cable network, it is many that the time that wireless network occurs will lack relatively, as mobile telephone network, WLAN (wireless local area network) (WLANs), satellite communications net etc.WLAN (wireless local area network) is set up according to one or more standards usually, and as IEEE802.11 .11 (a) .11 (b) .11 (g) etc., these standards can be referred to as " IEEE802.11 net ".In typical IEEE802.11 net, (Access Points APs) interconnects a plurality of WAP (wireless access point), and each point all can support the wireless telecommunications system computer of compatible wave point (as comprise) to carry out wireless telecommunications.APs provides the ability of the network of visit WLAN (wireless local area network) outside for wireless telecommunications system.

When using the mobile devices such as equipment of mobile computer, mobile data terminal and other revocable usually, also addressable cable LAN connections, WLAN (wireless local area network) has significant advantage.Yet, to compare with cable LAN such as IEEE802.3 net, WLAN (wireless local area network) provides relatively low data transfer rate.The cable network of configuration can provide the bandwidth that reaches 1 gigabit (Gigabit)/second at present, and very fast wireless network just can provide the 10GB/ bandwidth of second.Yet because the advantage aspect the service mobile device, WLAN (wireless local area network) has usually covered the coverage of cable network.In the said equipment, the equipment that is connected with cable LAN is mainly fixed, as desktop computer; And the equipment that is connected with WLAN (wireless local area network) mainly moves, as mobile computer.And mobile computer also can have cable LAN to connect, and makes it can obtain the service of higher bandwidth when not mobile.

The relative higher data rate of new wireless network standards support.For example, the data transfer rate of IEEE802.11 (a) standard support reaches 54,000,000 (Mega Bits) per second, and IEEE802.11 (g) has also reached above-mentioned data transfer rate.IEEE802.11 (a) has used OFDM, and (OrthogonalFrequency Division Multiplexing, OFDM) physical layer is to support above-mentioned data transfer rate.By the OFDM physical layer, available carrier wave is many subcarriers or passage (subcarriers or tones) by differential, and each subcarrier transmits the part of multiple signals data flow.IEEE802.11 (a) OFDM physical layer comprises 48 bit data transmission channels and 4 control signal passages, and space/bandwidth is 0.3125MHz.As shown in Figure 1, does not use subcarrier 0, subcarrier 27～32 and subcarrier-27～-31.Subcarrier+/-7, subcarrier+/-21 are as 4 control signal passages or signal.48 data transmission channels that are used to transmit data have been formed in subcarrier 1～6, subcarrier 8～20, subcarrier 22～26, subcarrier-1～-6, subcarrier-8～-20 and subcarrier-22～-26.

When the sub-carrier allocation standardization with Fig. 1, and the WLAN (wireless local area network) of supporting broad to change also exists the WLAN (wireless local area network) of some inapplicable above-mentioned sub-carrier allocation to use when using.For example, if bandwidth chahnel is narrower or when being used for going into many places (MIMO) wireless telecommunications, the sub-carrier allocation of Fig. 1 may not be optimal and/or attainable more.

Therefore, need to occur a kind of OFDM frames and generate Apparatus and method for, narrow passage is used and/or MIMO uses to be used for.

Summary of the invention

The form of OFDM frames of the present invention meets above-mentioned and other requirement fully.In one embodiment, a kind of method that is used for the generation OFDM frames of radio communication at first produces the header of described OFDM frames, and wherein said header comprises training information and signal message.Described method then produces a plurality of data fields of described OFDM frames, wherein each described a plurality of data field comprises a plurality of subcarrier frequencies, wherein comprise to the described a plurality of data fields of small part, at the most three described a plurality of subcarrier frequencies of being assigned control signals.

In another embodiment, a kind of method that is used for the generation OFDM frames of MIMO radio communication, at first changing a data flow is a plurality of data flow.It is a plurality of OFDM frames that described method is then changed described a plurality of data flow, wherein each described a plurality of OFDM frames comprises the header with training information and signal message, wherein each described a plurality of OFDM frames comprises a plurality of data fields, wherein the described a plurality of data fields of each of each described a plurality of OFDM frames comprise a plurality of subcarrier frequencies, wherein comprising to the described a plurality of data fields of small part of at least one described a plurality of OFDM frames, three described a plurality of subcarrier frequencies of being assigned control signals at the most.

In an embodiment again, a kind of method that is used for the reception OFDM frames of radio communication at first receives the header of described OFDM frames, and wherein said header comprises training information and signal message.Described method then receives a plurality of data fields of described OFDM frames, wherein each described a plurality of data field comprises a plurality of subcarrier frequencies, the wherein indication by signal message, comprise to the described a plurality of data fields of small part, at the most three described a plurality of subcarrier frequencies of being assigned control signals.Described method is then changed described a plurality of data field and is the input data.

In a further embodiment, one or more such methods can be a radiofrequency launcher and/or a radio frequency receiver.

Description of drawings

Fig. 1 is the schematic diagram of the sub-carrier allocation of existing OFDM frame;

Fig. 2 is the structure calcspar of the wireless telecommunication system of the Apparatus and method for of generation OFDM frames in the wireless telecommunications of the present invention;

Fig. 3 is the structure calcspar of the wireless telecommunications system of the Apparatus and method for of generation OFDM frames in the wireless telecommunications of the present invention;

Fig. 4 is the schematic diagram of the wireless telecommunications of the Apparatus and method for of generation OFDM frames in the wireless telecommunications of the present invention;

Fig. 5 is the schematic diagram of the OFDM frame sub-carrier allocation of the Apparatus and method for of generation OFDM frames in the wireless telecommunications of the present invention;

Fig. 6 is the schematic diagram of another OFDM frame sub-carrier allocation of the Apparatus and method for of generation OFDM frames in the wireless telecommunications of the present invention;

Fig. 7 is the table of comparisons that 802.11a and narrow passage of the present invention are used;

Fig. 8 produces the OFDM baseband signal of Apparatus and method for of OFDM frames and the schematic diagram of corresponding direct current notch filter in the wireless telecommunications of the present invention;

Fig. 9 is the schematic diagram of the ODFM frame sub-carrier allocation that is used for narrow passage of the Apparatus and method for of generation OFDM frames in the wireless telecommunications of the present invention;

Figure 10 is the structure calcspar of the multiple-input, multiple-output wireless telecommunication system of the Apparatus and method for of generation OFDM frames in the wireless telecommunications of the present invention;

Figure 11 is the structure calcspar of the wireless telecommunications system of the Apparatus and method for of generation OFDM frames in the wireless telecommunications of the present invention.

Embodiment

Fig. 2 shows the principle assumption diagram of a communication system 10, comprising a plurality of base stations and/or access point 12-16, and a plurality of Wireless Telecom Equipment 18-32, and a network hardware component 34.Wireless Telecom Equipment 18-32 wherein can be kneetop computer main frame 18 and 26, personal digital assistant main frame 20 and 30, personal computer main frame 24 and 32 and/or mobile telephone main unit 22 and 28.The back will be in conjunction with the accompanying drawings 3 be described in more detail these Wireless Telecom Equipments.

Base station or access point 12-16 operationally are connected with the network hardware 34 with 40 by local area network (LAN) 36,38.The network hardware 34 can be router, transducer, bridge, modulator-demodulator, system controller etc., and it can be communication system 10 provides a wide area network to connect 42.Each base station or access point 12-16 have the antenna or the aerial array of an association, with realize with its region in Wireless Telecom Equipment between communicate by letter.Usually, Wireless Telecom Equipment can be registered to a specific base stations or access point 12-16 to receive service from communication system 10.For direct connection (being point-to-point communication), can be between the Wireless Telecom Equipment by the passage direct communication of an appointment.

Usually, the base station is used for mobile telephone system and similar system, and access point then is used for the wireless network in family or the building.The particular type of ignoring communication system includes a built-in wireless transceiver and/or is connected to a wireless transceiver in each Wireless Telecom Equipment.It should be noted that one or more access points and attached Wireless Telecom Equipment thereof may be in the same building things.

Fig. 3 shows the principle assumption diagram of a Wireless Telecom Equipment, comprising the related wireless transceiver 60 with of main process equipment 18-32.For mobile telephone main unit, this wireless transceiver 60 is its built-in parts.For personal digital assistant main frame, kneetop computer main frame and/or personal host computer, this wireless transceiver 60 can be the The built-in parts, also can be its external link.

As can be seen from the figure, comprise a processing module 50, memory 52, wireless transceiver interface 54, an input interface 58 and an output interface 56 among the main process equipment 18-32.Processing module 50 and memory 52 are carried out the correspondence instruction of being finished by main process equipment usually.For example, for mobile telephone main unit equipment, processing module 50 can be carried out corresponding communication function according to a specific mobile phone standard.

Wireless transceiver interface 54 be used to realize and wireless transceiver 60 between Data Receiving and transmission.For the data (being inbound data) that receive from wireless transceiver 60, wireless transceiver interface 54 can offer processing module 50 to be for further processing and/or to be sent to output interface 56 with these data.Output interface 56 provide with output display unit between be connected, for example display, monitor, loud speaker etc., thus the data that receive can be revealed.Wireless transceiver interface 54 also can provide data to wireless transceiver 60 from processing module 50.Processing module 50 can receive the outbound data that input equipments such as keyboard, keypad, microphone transmit by input interface 58, or oneself generates these data.For the data that receive by input interface 58, processing module 50 can be carried out the host function of a correspondence and/or by wireless transceiver interface 54 these data is sent to wireless transceiver 60 these data.

Comprise a host interface 62 in the wireless transceiver 60, digit receiver processing module 64,66, one filtering/gain modules 68 of an analog-digital converter, an IF mixes down-conversion block 70, a receiver filter 71, a low noise amplifier (LNA) 72, a transmission/reception change over switch 73, a local oscillating module 74, memory 75, a digit emitter processing module 76, a D-A converter 78, a filtering/gain module 80, an IF mixes up-conversion module 82, a power amplifier 84, a receiver filter module 85, and antenna 86.Described antenna 86 can be under the control of transmission/reception change over switch 73 by sending and the shared single antenna of RX path, perhaps be respectively equipped with different antennas at transmit path and RX path.The enforcement of antenna will depend on the specific criteria that Wireless Telecom Equipment adapts to.

Digit receiver processing module 64 and digit emitter processing module 76 combine with the memory 75 that has operational order, respectively combine digital receiver function and digit emitter function.The digit receiver function includes but not limited to: mapping, decoding and/or deciphering are separated in digital intermediate frequency to baseband-converted, demodulation, combination.The digit emitter function includes but not limited to: encrypt, coding, combination mapping, modulation and/or digital baseband change to IF.Realize digit receiver and transmitter processing module 64 and 76, can use a shared processing equipment, use a treatment facility or use a plurality of treatment facilities respectively.Described treatment facility can be microprocessor, microcontroller, digital signal processor, microcomputer, CPU, field programmable gate array, programmable logic device, state machine, logical circuit, analog circuit, digital circuit and/or anyly can come the equipment of operation signal (simulation and/or numeral) based on operational order.Memory 75 can be single memory device or a plurality of memory device.But described memory device can be the equipment of read-only memory, random access memory, volatile memory, nonvolatile storage, static memory, dynamic memory, flash memory and/or any storing digital information.It should be noted, when processing module 64 and/or 76 realizes its one or more function by state machine, analog circuit, digital circuit and/or logical circuit, the memory that stores the corresponding operating instruction will be embedded in the circuit that includes described state machine, analog circuit, digital circuit and/or logical circuit.

During work, wireless transceiver 60 receives one group of outbound data 94 by host interface 62.Host interface 62 is sent to digit emitter processing module 76 with data, by the specific wireless communication standard of The latter (for example IEEE802.11, bluetooth etc.) described outbound data is handled, and is generated departures baseband signal 96.Departures include the OFDM frame in the baseband signal 96, and it can be a digital baseband signal (0IF is for example arranged) or the low IF signal of numeral, the frequency range of described low IF usually at 100KHz between several million Hz.

To set off baseband signal 96 of D-A converter 78 is transformed into analog domain from numeric field.Filtering/gain module 80 is used for analog signal being sent to before IF mixes up-conversion module 82, and this analog signal is carried out filtering and/or adjusted the gain of this analog signal.IF mixes up-conversion module 82 based on the transmitter local oscillated signal 83 that is provided by local oscillating module 74, and described Analog Baseband or low IF conversion of signals are become the RF signal.Power amplifier 84 amplifies this RF signal again, with generation departures RF signal 98, and delivers to receiver filter module 85 and carries out filtering.86 on the antenna RF signal 98 that should set off sends to target device, for example base station, access point and/or another Wireless Telecom Equipment.

Wireless transceiver 60 also receives the inbound RF signal of being sent by base station, access point or another Wireless Telecom Equipment 88 by antenna 86.Antenna 86 should offer receiver filter module 71 by inbound RF signal 88 by transmission/reception change over switch 73, and 71 pairs of described inbound RF signals of described receiver filter module carry out bandpass filtering.Receiver filter module 71 offers low noise amplifier 72 with filtered RF signal, and the latter amplifies to generate the inbound RF signal of an amplification signal 88.Inbound RF signal after low noise amplifier 72 will amplify again offers IF and mixes down-conversion block 70, the latter becomes inbound low IF signal or baseband signal based on the receiver local oscillated signal 81 that is provided by local oscillating module 74 with the RF conversion of signals after the described amplification.IF mixes down-conversion block 70 described inbound low IF signal or baseband signal is offered filtering/gain module 68.Carry out filtering and/or adjust its gain by 68 pairs of inbound low IF signals of filtering/gain module or baseband signal then.

Analog-digital converter 66 is transformed into numeric field with filtered check-in signal from analog domain, to generate an inbound baseband signal 90, contain the OFDM frame in the described inbound baseband signal 90, it can be digital baseband signal or the low IF signal of numeral, the frequency range of the low IF of described numeral usually at 100KHz between several million Hz.Mapping and/or demodulation are decoded, decipher, separated to 64 pairs of inbound baseband signals 90 of digit receiver processing module, to recover one group of inbound data 92 according to the particular wireless communication standards that is adopted by wireless transceiver 60.Host interface 62 offers main process equipment 18-32 by wireless transceiver interface 54 with the inbound data 92 that is recovered.

What those having ordinary skill in the art will appreciate that is that the Wireless Telecom Equipment shown in Fig. 3 can use one or more integrated circuits to realize.For example, main process equipment can be realized on an integrated circuit, digit receiver processing module 64, digit emitter processing module 76 and memory 75 can realize on one second integrated circuit that the remaining part of wireless transceiver 60 (except the antenna 86) can be realized on one the 3rd integrated circuit.In another example, wireless transceiver 60 can be realized on single integrated circuit.In another example, the processing module 50 of main process equipment can be a common process equipment of realizing on single integrated circuit with digit receiver and transmitter processing module 64 and 76.In addition, memory 52 and 75 can realize on the single integrated circuit and/or with the common process module at processing module 50, digit receiver and the transmitter processing module 64 of main process equipment and 76 places on same integrated circuit.

Fig. 4 is two radio communication schematic diagrames between the Wireless Telecom Equipment.As can be seen from the figure, have in first Wireless Telecom Equipment in transmitter 100, the second Wireless Telecom Equipments receiver 102 is arranged.Each Wireless Telecom Equipment can be realized by structure chart shown in Figure 3 with reference to the description of front.

As can be seen from the figure, receiver 100 receives one group of outbound data 94, and converts thereof into departures RF signal 98.The RF signal 98 that includes OFDM frame 104 is sent to receiver 102 from transmitter 100.Receiver 102 is received as inbound RF signal 88 with the OFDM frame, and converts them to one group of inbound data 92.

In OFDM frame 104, comprise a header portion 106 and a data part 108.Comprise training information 110 and signal message 112 in the described header portion 106.Use or other 802.11 are applied as example with 802.11a, can comprise a short training sequence, a plurality of guard interval and a plurality of long training sequence in the training information 110.Signal message part 112 can be and a consistent signal field of 802.11a or other 802.11 rules, and it provides and relevant information such as the length of OFDM frame 104, data transfer rate.In addition, may contain an indication in the signal message 112, to point out which can be as control signal or passage in a plurality of subcarriers of the data division of OFDM frame.

Comprise a plurality of guard intervals (GI) and a plurality of data field 114-118 in the data division 108.The data that contain in each data field are positioned at 64 subcarriers of OFDM frame.As shown in Figure 4, in one embodiment, containing 64 RF frequencies with RF signal 98 in the data field 116 is the subcarrier at center.For the passage of a 20MHz, the spacing between the subcarrier is 312.5Hz, and is represented by each arrow among Fig. 4.

It can also be seen that from figure some subcarrier is not used.Specifically being subcarrier 0, subcarrier 27 to 32, subcarrier-27 is not used to-31.Only use two control signals in this example, and be positioned at subcarrier 21 and subcarrier-21.In the present embodiment, subcarrier 7 and-7 is used to carry data, and they are used as guiding channel in the rule of 802.11a.So, just can transmit data, also transmit control signal, make a specific data field can represent more multidata by using than multi sub-carrier with less subcarrier.

Fig. 5 shows the another kind of allocation plan of the subcarrier in the OFDM frame.Wherein, control signal is positioned at subcarrier 7 and-7 positions, and subcarrier 21 and-21 is used to carry data.It should be noted that between the data field and data field of OFDM frame, the configuration of subcarrier can be by some predetermined pattern, one becomes state shown in Figure 5 from state shown in Figure 4 with distinguishing, or is fixed as Fig. 4 or configuration status shown in Figure 5.

Fig. 6 shows the another kind of allocation plan of the subcarrier in the OFDM frame.Wherein,

subcarrier

0,27 to 32 and-27 to-32 is not used.Subcarrier 1 to 6,8 to 20,22 to 26 ,-1 to-,-8 to-20 and-22 to-26 be used to carry data.In the present embodiment, subcarrier+/-7 and subcarrier+/-21 can be used to carry data or control signal.Equally, 0 to 4 in subcarrier+/-7 and subcarrier+/-21 can be used to carry guiding channel.

Fig. 7 shows the characteristic by a physical layer of one embodiment of the present of invention operation.Among the present invention, this physical layer resides at the passage of a 10MHz, and based on OFDM.The physical layer of it and 802.11 (a) has a lot of similitudes that some differences are also arranged.Fig. 3 compares the physical layer of 10MHz OFDM physical layer of the present invention and IEEE802.11 (a).10MHz OFDM physical layer of the present invention can run on multiple frequency band, comprises 4.9-5.0GHz frequency band and 5.03-5.091GHz frequency band.During the operation of this physical layer, has the maximum non-permission transmitting power of maximum permission transmitting power, 2500mw EIRP and 100mw of maximum magnitude, the 250mw of 3Km.

The path loss of this physical layer (obstacle passage) model can be by formula: L (d)=L (d ₀)+10nlog ₁₀(d/d ₀)+X σ describes, wherein, representative value 500m, 116dB+/-during 9.3dB, d ₀=1, L (d ₀)=46.6dB, n=2.58, σ=9.31.The mean value of the delay spread of this physical layer is 275.9ns, and the standard deviation of a 352ns is arranged.The delay spread of leading because of this physics is greater than the delay spread (50ns delay spread passage) of IEEE802.11 (a) physical layer, so need a guard interval (Cyclic Prefix).And the path loss of leading because of this physics is greater than the path loss of IEEE802.11 (a) physical layer, and the receiver that supports this physical layer should have higher sensitivity.

With the contrast of IEEE802.11 (a) physical layer, when the bandwidth of receiver was reduced by a factor 2, the SNR of this physical layer can improve 3dB.The length of guard interval (Cyclic Prefix) can be double to 1.6ms.Symbol lengths is doubled to keep the guard interval expense identical with IEEE802.11 (a).As IEEE802.11 (a) physical layer, also can use one 64 point quick Fourier conversion (FFT) in this physical layer

Fig. 8 is according to the embodiment of the invention, describes the control mode of physical layer channel.Because the bandwidth of physical layer reduces (for the bandwidth of IEEE802.11 (a) physical layer), central passage, DC is more approached in passage-1 and passage+1.At the DC place, many receivers connect notch filter.Support between the portable terminal the normal frequency compensation effectively with groove away from the DC place.At the interval near passage, frequency compensated effect is harsh more.Under maximum critical operation condition, frequency compensation can be deleted the part of passage-1 or passage+1 because of notch filter.

Therefore, according to the present invention, inner two data subcarriers (passage-1 and passage+1) are removed/are not used further to the regulating frequency compensation.Utilize the data of IEEE802.11 (a) physical layer designated bearing on passage-1 and+1 to move to carrying control signal passage-12, on-7,7 and 21 the subcarrier.After the correction, physical layer comprises the dead band bandwidth of a 407.28KHz+ receiver groove bandwidth.

In a kind of utilization, physical layer is used alternatingly passage according to k=notation index mould 6 (from the zero-signal sign-on):

K=0; Passage 21, the data k=1 the on-7}; 21,7}

k＝2；{-21，21} k＝3；{-7，7}

k＝4；{-7，21} k＝5；{7，21}

This scheme has kept the diversity of the frequency of control signal.And, except the time cycle that is used for IFFT increases because of the factor 2, produce short and long training symbol with IEEE802.11 (a) part 17.3.3 the same manner.Support PHY grade 3,4.5,6,9,12,18,25,27Mbps.

The symbol time of these lengthenings and air borne time need the MAC time to change (for IEEE802.11 (a) physical layer).These times variations are summarized as follows:

ACCATime is increased to 8 microseconds from 4

AAirPropagationTime is increased to 2 microseconds from being far smaller than 1 microsecond

The aSlotTIME=14 microsecond

ASIFTIME=16 microsecond (no change)

PIFS=30 microsecond (SIF+SLOT)

DIFS=44 microsecond (SIF+2 ^*SLOT)

Fig. 9 is a sub-carrier allocation figure who is used for the OFDM frame of narrow passage.Narrow passage can have a bandwidth less than 20MHz, can be 10MHz in one embodiment.In this example, with reference to the accompanying drawings 8, subcarrier 0 and+1 and-1 does not use.In addition, subcarrier 27 to 32 and-27 does not use to 32 yet.In this example, be to substitute the loss passage of subcarrier-1 and+1, use subcarrier+7 and-7 or+21 and-21 be used to transmit data, and use another that subcarrier is transmitted control signal.In this example, subcarrier+1 and-1 is used to transmit empty data.

Figure 10 is the wireless telecommunications structural representation of multiple-input, multiple-output wireless (MIMO).In this example, the reflector 120 of wireless telecommunications system receives the data flow 124 of departures, and converts thereof into a plurality of RF signals, and each RF signal includes a plurality of OFDM frames 126.Receiver 122 receives described a plurality of RF signals, and converts thereof into inbound data stream 128.Reflector 120 and receiver 122 will be further combined with the wireless telecommunications system explanations of Figure 11.

In the accompanying drawings, each OFDM frame 126 can be a sub-carrier allocation mode shown in Figure 6.And from being routed to path, the sub-carrier allocation mode can be different.For example, if there are four wireless telecommunications paths to be present between reflector 120 and the receiver 122, each path in four can have different sub-carrier allocation modes.For example, a radio path can not have the control signal passage, and another can have four control signal passages, and remaining two one of them can be+7 and-7, another+21 and-21.Those skilled in the art as can be known, because the many communication channels between reflector 120 and receiver 122, the control signal passage that sends from a path can be used to synchronously and/or point to another path, and perhaps they can be used for associated synchronisation and/or point to multipath.

Figure 11 is the structural representation that comprises the main process equipment 18-32 and the wireless telecommunications system of related wireless transceiver 160.In mobile phone, wireless transceiver 160 is built-in assemblies.For personal digital assistant main frame, kneetop computer main frame, and/or personal host computer, wireless transceiver 160 can be built-in or external coupling unit.

As shown in the figure, main process equipment 18-32 comprises processing module 50, memory 52, wireless transceiver interface 54, input interface 58 and output interface 56.Processing module 50 and memory 52 are carried out those communication instructions of finishing usually on main process equipment.For example, mobile telephone main unit, processing module 50 is finished the communication function according to concrete mobile phone standard.

Wireless transceiver interface 54 is realized reception and the transmission of data from wireless transceiver 160.Wireless transceiver interface 54 is delivered to processing module 50 with these data that receive from wireless transceiver 160 and is used for further handling and/or sending to output interface 56.Output interface 56 connects the output display unit of display, monitor, loud speaker etc. to show the data that receive.Wireless transceiver interface 54 also provides data for processing module 50 to wireless transceiver 160.Processing module 50 can receive by data or the generation data itself of input interface 58 from for example input equipment of keyboard, keypad, microphone etc.For the data that receive by input interface 58, processing module 50 can provide the corresponding host function of data aspect and/or data are sent to wireless transceiver 160 by wireless transceiver interface 54.

Wireless transceiver 160 comprises host interface 162, baseband processing module 164, memory 166, a plurality of wireless frequency (RF) reflector 168-172, emission/reception (T/R) module 174, a plurality of antenna 182-186, a plurality of RF receiver 176-180 and local oscillating module 200.The baseband processing module 164 that combines with the operational order that is stored in memory 166, combine digital receiver function and digit emitter function respectively.The digit receiver function includes but not limited to: digital intermediate frequency to conversion, demodulation, the combination of base band separate mapping, decode, go intersection, the decoding and/or the normalization (descrambling) of fast Fourier transform, preposition removal of cycle (cyclic prefix removal), spatial domain and time-domain.The digit emitter function includes but not limited to: the coding of preposition, spatial domain of randomization (scrambling), coding, intersection, combination mapping, modulation, anti-fast Fourier transform, cycle and time-domain, and/or digital baseband is to the conversion of digital intermediate frequency.Baseband processing module 164 can be realized by one or more treatment facilities.This treatment facility can be microprocessor, microcontroller, digital signal processor, microcomputer, CPU, programmable gate array, programmable logic device, state machine, logical circuit, analog circuit, digital circuit, and/or arbitrarily can be based on the device of operational order processing signals (simulation and/or numeral).Memory 166 can be single memory or multi-memory.Sort memory can be a read-only memory, random access memory, volatile memory, nonvolatile storage, static memory, dynamic memory, flash memory, and/or the equipment that has the storing digital information function arbitrarily.Notice that when processing module 64 is carried out one or more function by static machine, analog circuit, digital circuit and/or logical circuit the memory of storing communication operational order is embedded in the circuit that comprises static machine, analog circuit, digital circuit and/or logical circuit.

Be in operation, wireless transceiver 160 receives outbound data stream 188 by host interface 162 from main frame.Baseband processing module 164 receives outbound data stream 188, and produces one or more departures symbols streams 190 based on mode select signal 202, and each departures symbols streams comprises the OFDM frame.The concrete pattern of mode select signal 202 expressions specifies in the model selection table, sees this paper end for details.For example mode select signal 202, can be 2.4GHz, bandwidth chahnel 20 or 22MHz and Maximum Bit Rate 54 megabit per seconds with reference to the frequency band shown in the table 1.In common type, mode select signal shows that also a concrete frequency range is from 1,000,000 per seconds to 54, million per seconds.In addition, mode select signal shows the particular type of modulation, includes but not limited to Barker code modulation, BPSK, QPSK, CCK, 16QAM and/or 64QAM.As table 1, give encoding rate: the susceptibility of the maximum reception capacity of the error vector magnitude (EVM) in each width of cloth carrier wave encoding ratio paricular value (NBPSC), each OFDM symbolic coding bit value (NCBPS), each OFDM symbol data bit value (NDBPS), the decibel, expression requirement acquisition target data packet error rate (for example, be 10% in IEEE802.11a), adjacency channel rejection (ACR), and alternately adjacency channel rejection (AACR).

Mode select signal 202 also shows the mode of concrete channelizing, and to be used for communication pattern, this communication pattern that is used for the information of table 1 has illustrated in table 2.As table, comprise the number of channel and message center frequency in the table 2.Mode select signal can also show the power spectral density shielding code value that is used for table 1 shown in the table 3.The rate value with 5GHz frequency band, 20MHz channel width and Maximum Bit Rate 54 megabit per seconds of mode select signal 202 in can expression table 4.If concrete model selection is fixed, then table 5 shows the selection of its carrier wave.Can also select, as shown in Figure 6, mode select signal 102 can be represented the rate value of 2.4GHz frequency band, 20MHz channel width and Maximum Bit Rate 192 megabit per seconds.A large amount of antennas can be used to obtain more high bandwidth in Fig. 6.In this example, model selection also shows the quantity of used antenna.Table 7 explanation is used for the selection of the carrier wave of table 6.Table 8 explanation another preference pattern under the situation of 2.4GHz frequency band, 20MHz channel width and Maximum Bit Rate 192 megabit per seconds.Corresponding table 8 comprises the various bit rates of space time coding counting rate meter scope from 12 megabit per seconds to 216 megabit per seconds that use the 2-4 antenna and represent in table.Table 9 expression is used for the selection of the carrier wave of table 8.Mode select signal 202 can also be represented the concrete operations pattern shown in the table 10, and corresponding to the 5GHz frequency band, it has 40MHz frequency band, 40MHz channel width and Maximum Bit Rate 486,000,000 per seconds.As shown in table 10, utilize 1-4 antenna and corresponding communication space time encoding rate, the bit rate variation scope can be from 13.5 megabit per seconds to 486 megabit per seconds.Table 10 also shows specific coding configuration codes rate and NBPSC value.Table 11 has provided the power spectral density shielding code value that is used for table 10, and table 12 provides the selection of the carrier wave of table 10.

Based on the baseband processing module 164 of mode select signal 202, from outbound data 188, produce one or more departures symbols streams 190, this departures symbols streams 190 comprises OFDM frame as described herein.For example, be used for the concrete pattern of having selected if mode select signal 202 shows the single transmit antenna, then baseband processing module 164 will produce single departures symbols streams 190.Selectable, if mode select signal is represented 2,3 or 4 antennas, baseband processing module 164 will be from 2, the 3 or 4 departures symbols streams 190 of outbound data 188 generations corresponding to antenna number.

According to the quantity of the departures symbols streams 190 that is produced by baseband processing module 164, the RF reflector 168-172 of respective numbers can be used for converting departures symbols streams 190 to departures RF signal 192.Transmit/receive module 174 receives departures RF signals 192, and provides communication antenna 182-186 for departures RF signal.

When wireless transceiver 160 during at the receptive pattern state, transmit/receive module 174 receives one or more inbound RF signals by antenna 182-186.Transmit/receive module 174 provides inbound RF signal 194 for one or more RF receiver 176-180.RF receiver 176-180 converts input rf signal 194 to the corresponding communication data that comprises the check-in signal stream 196 of the OFDM frame described in the literary composition.The quantity of check-in signal stream 196 is corresponding to the concrete pattern (this pattern can be any one pattern that table 1-12 represents) of Data Receiving.Baseband processing module 164 reception of inbound symbols streams 190 also convert thereof into inbound data stream 198, and this data flow offers main frame 18-32 by host interface 162.

Just as is known to the person skilled in the art, the wireless telecommunications system among Figure 11 can utilize one or more integrated circuits to realize.For example, main process equipment can realize on an integrated circuit that baseband processing module 164 and memory 166 can realize that residue can realize except the assembly of the wireless transceiver 160 of antenna 182-186 at second integrated circuit on the 3rd integrated circuit.In another embodiment, wireless transceiver 160 can be realized on single integrated circuit.Another example, the processing module 150 of main process equipment and baseband processing module 164 can be shared treatment facilities on single integrated circuit.And memory 152 and memory 166 can realized on single integrated circuit and/or on the same integrated circuit of the common treatment module of processing module 150 and baseband processing module 164.

Known to persons skilled in the art, employed in the literary composition, term " fully " or " approx ", provide the correlation between a kind of industrial compatible communications term that allows and/or the term.The compatible scope that this industry allows is from being lower than 1% to 20%, and corresponding but be not limited to, components values, integrated circuit processing variation, variations in temperature, rising and reduction number of times, and/or thermal noise.The difference of correlation between this term from less percentage difference to big numbers of poles.Persons skilled in the art also as can be known, employed in the literary composition, term " exercisable connection ", comprise by other assemblies, element, circuit or module and directly connect and be connected indirectly, yet connection indirectly, interactive component, element, circuit or module are not revised signal message but are needed to regulate current class, electric pressure and/or energy grade.Known to persons skilled in the art, the connection that can know by inference (just an element is connected to another element by interface) is included in directly and indirectly to connect between the element and in the same way just " can be operatively connected ".Persons skilled in the art as can be known, and are employed in the literary composition, and the comparison of two or more elements, term, signal or the like represented in term " effective ratio ", and a predictable contact is provided.For example, can predict contact is that signal 1 has the bigger order of magnitude than signal 2, just, when the order of magnitude of signal 1 is bigger than the order of magnitude of signal 2 or under the little situation of the order of magnitude than signal 1 of signal 2, can obtain effective ratio.

Above-mentioned discussion discloses the various method and apparatus that are used to produce and receive the OFDM frame.Persons skilled in the art can obtain other embodiment by the professor of institute method of the present invention as can be known under the situation that does not exceed the claim scope.

The model selection table:

Table 1:2.4GHz, 20/22MHz bandwidth chahnel, 54Mbps Maximum Bit Rate

Than modulating-coding NBPSC NCBPS NDBPSEVM spirit ACR AACR

Special rate is quick

The rate degree

Barker

1 BPSK

Barker

2 QPSK

5.5?CCK

6 BPSK 0.5 1 48 24 -5 -82 16 32

9 BPSK 0.75 1 48 36 -8 -81 15 31

11 CCK

12 QPSK 0.5 2 96 48 -10 -79 13 29

18 QPSK 0.75 2 96 72 -13 -77 11 27

24 16-QAM 0.5 4 192 96 -16 -74 8 24

36 16-QAM 0.75 4 192 144 -19 -70 4 20

48 64-QAM 0.666 6 288 192 -22 -66 0 16

54 64-QAM 0.75 6 288 216 -25 -65 -1 15

Table 2: the selection of the carrier wave of table 1

Channel frequence (MHz)

1 2412

2 2417

3 2422

4 2427

5 2432

6 2437

7 2442

8 2447

9 2452

10 2457

11 2462

12 2467

Table 3: the power spectral density mask off code of table 1

Power spectral density mask off code frequency shift (FS) 1dBr

-9MHz～9MHz 0

+/-11MHz -20

+/-20MHz -28

The 30MHz of+/-and bigger by-50

Table 4:5GHz, 20MHz bandwidth chahnel, 54Mbps Maximum Bit Rate

Than modulating-coding NBPSC NCBPS NDBPS EVM spirit ACR AACR

Special rate is quick

The rate degree

6 BPSK 0.5 1 48 24 -5 -82 16 32

9 BPSK 0.75 1 48 36 -8 -81 15 31

12 QPSK 0.5 2 96 48 -10 -79 13 29

18 QPSK 0.75 2 96 72 -13 -77 11 27

24 16-QAM 0.5 4 192 96 -16 -74 8 24

36 16-QAM 0.75 4 192 144 -19 -70 4 20

48 64-QAM 0.666 6 288 192 -22 -66 0 16

54 64-QAM 0.75 6 288 216 -25 -65 -1 15

Table 5: the selection of the carrier wave of table 4

The national channel frequence of channel frequence (MHz) (MHz) country

240 4920 Japan

244 4940 Japan

248 4960 Japan

252 4980 Japan

8 5040 Japan

12 5060 Japan

16 5080 Japan

36 5180 USA/Europe 34 5170 Japan

40 5200 USA/Europe 38 5190 Japan

44 5220 USA/Europe 42 5210 Japan

48 5240 USA/Europe 46 5230 Japan

52 5260 USA/Europe

56 5280 USA/Europe

60 5300 USA/Europe

64 5320 USA/Europe

100 5500 USA/Europe

104 5520 USA/Europe

108 5540 USA/Europe

112 5560 USA/Europe

116 5580 USA/Europe

120 5600 USA/Europe

124 5620 USA/Europe

128 5640 USA/Europe

132 5660 USA/Europe

136 5680 USA/Europe

140 5700 USA/Europe

149 5745 USA

153 5765 USA

157 5785 USA

161 5805 USA

165 5825 USA

Table 6:2.4GHz, 20MHz bandwidth chahnel, 192Mbps Maximum Bit Rate

TX ST

Bit-rate modulation encoding rate NBPSC NCBPS NDBPS

The antenna encoding rate

12 2 1 BPSK 0.5 1 48 24

24 2 1 QPSK 0.5 2 96 48

48 2 1 16-QAM 0.5 4 192 96

96 2 1 64-QAM 0.666 6 288 192

108 2 1 64-QAM 0.75 6 288 216

18 3 1 BPSK 0.5 1 48 24

36 3 1 QPSK 0.5 2 96 48

72 3 1 16-QAM 0.5 4 192 96

144 3 1 64-QAM 0.666 6 288 192

162 3 1 64-QAM 0.75 6 288 216

24 4 1 BPSK 0.5 1 48 24

48 4 1 QPSK 0.5 2 96 48

96 4 1 16-QAM 0.5 4 192 96

192 4 1 64-QAM 0.666 6 288 192

216 4 1 64-QAM 0.75 6 288 216

Table 7: the selection of the carrier wave of table 6

Channel frequence (MHz)

1 2412

2 2417

3 2422

4 2427

5 2432

6 2437

7 2442

8 2447

9 2452

10 2457

11 2462

12 2467

Table 8:5GHz, 20MHz bandwidth chahnel, 192Mbps Maximum Bit Rate

TX ST

Bit rate antenna encoding rate modulating-coding rate NBPSC NCBPS NDBPS

12 2 1 BPSK 0.5 1 48 24

24 2 1 QPSK 0.5 2 96 48

48 2 1 16-QAM 0.5 4 192 96

96 2 1 64-QAM 0.666 6 288 192

108 2 1 64-QAM 0.75 6 288 216

18 3 1 BPSK 0.5 1 48 24

36 3 1 QPSK 0.5 2 96 48

72 3 1 16-QAM 0.5 4 192 96

144 3 1 64-QAM 0.666 6 288 192

162 3 1 64-QAM 0.75 6 288 216

24 4 1 BPSK 0.5 1 48 24

48 4 1 QPSK 0.5 2 96 48

96 4 1 16-QAM 0.5 4 192 96

192 4 1 64-QAM 0.666 6 288 192

2164 1 64-QAM 0.75 6 288 216

Table 9: the selection of the carrier wave of table 8

The national channel frequence of channel frequence (MHz) (MHz) country

240 4920 Japan

244 4940 Japan

248 4960 Japan

252 4980 Japan

8 5040 Japan

12 5060 Japan

16 5080 Japan

36 5180 USA/Europe 34 5170 Japan

40 5200 USA/Europe 38 5190 Japan

44 5220 USA/Europe 42 5210 Japan

48 5240 USA/Europe 46 5230 Japan

52 5260 USA/Europe

56 5280 USA/Europe

60 5300 USA/Europe

64 5320 USA/Europe

100 5500 USA/Europe

104 5520 USA/Europe

108 5540 USA/Europe

112 5560 USA/Europe

116 5580 USA/Europe

120 5600 USA/Europe

124 5620 USA/Europe

128 5640 USA/Europe

132 5660 USA/Europe

136 5680 USA/Europe

140 5700 USA/Europe

149 5745 USA

153 5765 USA

157 5785 USA

161 5805 USA

165 5825 USA

Table 10:5GHz and 40MHz passage and 486Mbps maximum baud rate

TX ST

Bit rate antenna encoding rate modulating-coding rate NBPSC

13.5Mbps 1 1 BPSK 0.5 1

27Mbps 1 1 QPSK 0.5 2

54Mbps 1 1 16-QAM 0.5 4

108Mbps 1 1 64-QAM 0.666 6

121.5Mbps 1 1 64-QAM 0.75 6

27Mbps 2 1 BPSK 0.5 1

54Mbps 2 1 QPSK 0.5 2

108Mbps 2 1 16-QAM 0.5 4

216Mbps 2 1 64-QAM 0.666 6

243Mbps 2 1 64-QAM 0.75 6

40.5Mbps 3 1 BPSK 0.5 1

81Mbps 3 1 QPSK 0.5 2

162Mbps 3 1 16-QAM 0.5 4

324Mbps 3 1 64-QAM 0.666 6

365.5Mbps 3 1 64-QAM 0.75 6

54Mbps 4 1 BPSK 0.5 1

108Mbps 4 1 QPSK 0.5 2

216Mbps 4 1 16-QAM 0.5 4

432Mbps 4 1 64-QAM 0.666 6

486Mbps 4 1 64-QAM 0.75 6

Table 11: the power spectral density mask off code of table 10

Power spectral density mask off code frequency shift (FS) 2dBr

-9MHz～9MHz 0

+/-21MHz -20

+/-30MHz -28

The 40MHz of+/-and bigger by-50

Table 12: the selection of the carrier wave of table 10

The national channel frequence of channel frequence (MHz) (MHz) country

242 4930 Japan

250 4970 Japan

12 5060 Japan

38 5190 USA/Europe 36 5180 Japan

46 5230 USA/Europe 44 5520 Japan

54 5270 USA/Europe

62 5310 USA/Europe

102 5510 USA/Europe

110 5550 USA/Europe

118 5590 USA/Europe

126 5630 USA/Europe

134 5670 USA/Europe

151 5755 USA

159 5795 USA

Claims

1, a kind of method that is used for the generation OFDM frames of radio communication is characterized in that, may further comprise the steps:

Produce the header of OFDM frames, wherein said header comprises training information and signal message; With

Produce the data field of a plurality of OFDM frames, wherein each data field comprises a plurality of subcarriers, and wherein the partial data territory comprises that maximum three are divided the subcarrier of sending out control signal at least;

Transmit described OFDM frames at a narrow channel, wherein said narrow channel has the channel width less than 20 megahertzes.

2, method according to claim 1 is characterized in that, a plurality of data field steps of wherein said generation comprise:

Utilize subcarrier+7 and-7 in each described partial data at least territory to come Data transmission and to subcarrier+1 and-1 zeroing in each described partial data at least territory.

3, method according to claim 1 is characterized in that, a plurality of data field steps of wherein said generation comprise:

Utilize subcarrier+21 and-21 in each described partial data at least territory come Data transmission and

Subcarrier+1 and-1 zeroing to each described partial data at least territory.

4, method according to claim 1 is characterized in that, a plurality of data field steps of wherein said generation comprise:

To each subcarrier+1 and-1 zeroing to the described a plurality of data fields of small part;

To at least one described partial data at least territory, utilize subcarrier+7 and-7 to come Data transmission; With

To another described partial data at least territory at least, utilize subcarrier+21 and-21 to come Data transmission.

5, method according to claim 1 is characterized in that, wherein produces the header step and comprises:

Produce signal message and will assign control signal to indicate which described a plurality of subcarrier frequency.

6, a kind of method that is used for the generation OFDM frames of MIMO radio communication is characterized in that described method comprises:

Changing a data flow is a plurality of data flow; With

Described a plurality of data flow are converted to a plurality of OFDM frames, wherein each described OFDM frames comprises the header with training information and signal message, each described OFDM frames comprises a plurality of data fields, each described OFDM frames data field comprises a plurality of subcarrier frequencies, and wherein the territory of partial data at least of OFDM frames comprises three subcarrier frequencies of being assigned control signal at the most.

7, method according to claim 6 is characterized in that, wherein said OFDM frames comprises in the partial data territory at least:

Data are transmitted in subcarrier+7 and-7 and control signal is transmitted in each subcarrier+21 and-21.

8, method according to claim 6 is characterized in that, wherein the described partial data at least of OFDM frames territory comprises:

Subcarrier+21 and-21 transmit data and control signal is transmitted with-7 in each subcarrier+7.

9, method according to claim 6 is characterized in that, wherein the described partial data at least of OFDM frames territory comprises:

To at least one described partial data at least territory, utilize subcarrier+7 and-7 transmit data and

To another described partial data at least territory at least, utilize subcarrier+21 and-21 to transmit data.

10, method according to claim 6 is characterized in that, further comprises:

11, method according to claim 6 is characterized in that, wherein described a plurality of data flow is converted to a plurality of OFDM frames steps and comprises:

Produce first OFDM frames, described first OFDM frames comprise data field with four control signals and

Produce remaining OFDM frames, described remaining OFDM frames comprises a plurality of data fields that are less than four control signals.

12, a kind of method that is used for the reception OFDM frames of radio communication is characterized in that described method comprises:

Receive the header of described OFDM frames, described header comprises training information and signal message;

Receive a plurality of data fields of described OFDM frames, wherein each described data field comprises a plurality of subcarriers, and wherein, the partial data territory comprises three subcarrier frequencies that indicate by signal message, that assigned control signal at most at least; With

Described a plurality of data fields are converted to internal data.

13, method according to claim 12 is characterized in that, further comprises:

Receive described OFDM frames by a narrow bandwidth passage, wherein said narrow bandwidth passage has the channel width less than 20 megahertzes.

14, method according to claim 12 is characterized in that, wherein receives described a plurality of data field step and also comprises:

Subcarrier+7 and-7 restore data from each described partial data at least territory; With

Recover remainder certificate from subcarrier+1 and-1 in each described partial data at least territory.

15, method according to claim 12 is characterized in that, the described a plurality of data fields of wherein said reception comprise:

Subcarrier+21 and-21 restore data from each described partial data at least territory; With

16, method according to claim 12 is characterized in that, the described data field step of described reception comprises:

Recover remainder certificate from subcarrier+1 and-1 in each described partial data at least territory;

To at least one described partial data at least territory, from subcarrier+7 and-7 restore data; With

To another described partial data at least territory at least, from subcarrier+21 and-21 restore data.

17, a kind of method that is used for the reception OFDM frames of MIMO radio communication is characterized in that described method comprises:

Receive a plurality of OFDM frames, wherein each OFDM frames comprises the header with training information and signal message, each OFDM frames comprises a plurality of data fields, each described OFDM frames data field comprises a plurality of subcarrier frequencies, and wherein at least one described OFDM frames data field comprises three described a plurality of subcarrier frequencies that indicate by signal message, that assigned control signal at most;

Described a plurality of OFDM frames are converted to a plurality of data flow; With

Described a plurality of data flow are converted to a data flow.

18, method according to claim 17 is characterized in that, the described of wherein said at least one described a plurality of OFDM frames comprises to the described a plurality of data fields of small part:

19, method according to claim 17 is characterized in that, the described of wherein said at least one described a plurality of OFDM frames comprises to the described a plurality of data fields of small part:

Data are transmitted in subcarrier+21 and-21 and control signal is transmitted in each subcarrier+7 and-7.

20, method according to claim 17 is characterized in that, the described of wherein said at least one described a plurality of OFDM frames comprises to the described a plurality of data fields of small part:

Described at least one to the described a plurality of data fields of small part, from pair carry+7 and-7 restore data; With

To another is described to the described a plurality of data fields of small part at least, from subcarrier+21 and-21 restore data.

21, method according to claim 17 is characterized in that, wherein said a plurality of OFDM frames comprise:

First OFDM frames comprises the described a plurality of data fields with four control signals; With

Residual quadrature frequency division multiplexing frame comprises having the described a plurality of data fields that are less than four control signals.

22, a kind of radiofrequency launcher is characterized in that, comprising:

Baseband processing module can connect and be used to produce OFDM frames, by:

Produce the header of described OFDM frames, wherein said header comprise training information and signal message and

Produce a plurality of data fields of described OFDM frames, wherein each described a plurality of data field comprises a plurality of subcarriers, and wherein the partial data territory comprises three described a plurality of subcarrier frequencies of being assigned control signal at the most at least; With

The radio frequency translator unit can connect and is used for described OFDM frames is converted to output RF signal.

23, radiofrequency launcher according to claim 22 is characterized in that, further comprises:

Generation is used to transmit the narrow bandwidth passage of described OFDM frames, and wherein said narrow bandwidth passage has the channel width less than 20 megahertzes.

24, radiofrequency launcher according to claim 23 is characterized in that, the described a plurality of data fields of described generation comprise:

Utilize each described subcarrier+7 and-7 to transmit data to the described a plurality of data fields of small part; With

Each described subcarrier+1 and-1 zeroing to the described a plurality of data fields of small part.

25, radiofrequency launcher according to claim 23 is characterized in that, the described a plurality of data fields of described generation comprise:

Utilize each described subcarrier+21 and-21 to transmit data to the described a plurality of data fields of small part; With

Each described pair to the described a plurality of data fields of small part is carried+1 and-1 zeroing.

26, radiofrequency launcher according to claim 23 is characterized in that, the described a plurality of data fields of wherein said generation comprise:

Each described subcarrier+1 and-1 zeroing to the described a plurality of data fields of small part;

Described at least one to the described a plurality of data fields of small part, utilize subcarrier+7 and-7 to transmit data; With

To another is described to the described a plurality of data fields of small part at least, utilize subcarrier+21 and-21 to transmit data.

27, radiofrequency launcher according to claim 24 is characterized in that, the described header of wherein said generation comprises:

Which described a plurality of subcarrier frequency produces described signal message indicates and will assign control signal.

28, a kind of radiofrequency launcher is characterized in that, comprising:

Baseband processing module can connect and be used to produce the OFDM frames that is used for MIMO radio communication, by:

With a data flow be converted to a plurality of data flow and

Described a plurality of data flow are converted to a plurality of OFDM frames, wherein each OFDM frames comprises the header with training information and signal message, each OFDM frames comprises a plurality of data fields, wherein the described a plurality of data fields of each of each described a plurality of OFDM frames comprise a plurality of subcarrier frequencies, and wherein the territory of partial data at least of at least one described a plurality of OFDM frames comprises three described a plurality of subcarrier frequencies of being assigned a control signal at the most; With

The radio frequency translator unit, can connect and be used to change described a plurality of OFDM frames is a plurality of output RF signals.

29, radiofrequency launcher according to claim 28 is characterized in that, wherein said at least one described a plurality of OFDM frames described to the described a plurality of data fields of small part comprises:

Subcarrier+7 and-7 transmit data and control signal is transmitted in each subcarrier+21 and-21.

30, radiofrequency launcher according to claim 28 is characterized in that, wherein said at least one described a plurality of OFDM frames described to the described a plurality of data fields of small part comprises:

Subcarrier+21 and-21 transmit data and control signal is transmitted in each subcarrier+7 and-7.

31, radiofrequency launcher according to claim 28 is characterized in that, wherein said at least one described a plurality of OFDM frames described to the described a plurality of data fields of small part comprises:

32, radiofrequency launcher according to claim 28 is characterized in that, wherein said baseband processing module further has following function:

33, radiofrequency launcher according to claim 28 is characterized in that, the described a plurality of data flow of wherein said conversion are that a plurality of OFDM frames comprise:

Produce first OFDM frames, comprise described a plurality of data fields with four control signals; With

Produce residual quadrature frequency division multiplexing frame, comprise having the described a plurality of data fields that are less than four control signals.

34, a kind of radio frequency receiver is characterized in that, comprising:

The radio frequency receiving unit, can connect and be used for conversion output RF signal is OFDM frames; With

Baseband processing module can connect and is used for:

Receive the header of described OFDM frames, wherein said header comprises training information and signal message; With

Receive a plurality of data fields of described OFDM frames, wherein each described a plurality of data field comprises a plurality of subcarrier frequencies, wherein, by the appointment of signal message, the partial data territory comprises three described a plurality of subcarrier frequencies of being assigned a control signal at most at least; With

Described a plurality of data fields are converted to the input data.

35, radio frequency receiver according to claim 34 is characterized in that, the described a plurality of data fields of wherein said reception comprise:

Come restore data by each described subcarrier+7 and-7 to the described a plurality of data fields of small part; With

Recover remainder certificate by each described subcarrier+1 and-1 to the described a plurality of data fields of small part.

36, radio frequency receiver according to claim 34 is characterized in that, described receiver also is used for: receive OFDM frames by a narrow passage, wherein said narrow passage bandwidth is less than 20MHz.

37, radio frequency receiver according to claim 34 is characterized in that, the described a plurality of data fields of wherein said reception comprise:

From each described subcarrier+21 and-21 restore data to the described a plurality of data fields of small part; With

Recover remainder certificate from each described subcarrier+1 and-1 to the described a plurality of data fields of small part.

38, radio frequency receiver according to claim 34 is characterized in that, the described a plurality of data fields of wherein said reception comprise:

Recover remainder certificate from each described subcarrier+1 and-1 to the described a plurality of data fields of small part;

Described at least one to the described a plurality of data fields of small part, from subcarrier+7 and-7 restore data; With

39, a kind of radiofrequency launcher is characterized in that, comprising:

The RF receiving unit that is used for MIMO radio communication, can connect and be used to change input rf signal is a plurality of OFDM frames; With

Baseband processing module can connect and is used for:

Receive described a plurality of OFDM frames, wherein each OFDM frames comprises the header with training information and signal message, wherein each described a plurality of OFDM frames comprises a plurality of data fields, wherein the described data field of each of each described a plurality of OFDM frames comprises a plurality of subcarrier frequencies, wherein, by the appointment of signal message, the territory of partial data at least of at least one described a plurality of OFDM frames comprises three described a plurality of subcarrier frequencies of being assigned a control signal at the most;

Described a plurality of data flow are converted to a data flow.

According to the described radiofrequency launcher of claim 39, it is characterized in that 40, the described of wherein said at least one described a plurality of OFDM frames comprises to the described data field of small part:

According to the described radiofrequency launcher of claim 39, it is characterized in that 41, the described of wherein said at least one described a plurality of OFDM frames comprises to the described data field of small part:

According to the described radiofrequency launcher of claim 39, it is characterized in that 42, the described of wherein said at least one described a plurality of OFDM frames comprises to the described data field of small part:

According to the described radiofrequency launcher of claim 39, it is characterized in that 43, wherein said a plurality of OFDM frames comprise: