CN100566226C - In MIMO communication system, transmit the method and system of information - Google Patents
In MIMO communication system, transmit the method and system of information Download PDFInfo
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- CN100566226C CN100566226C CNB2006100087227A CN200610008722A CN100566226C CN 100566226 C CN100566226 C CN 100566226C CN B2006100087227 A CNB2006100087227 A CN B2006100087227A CN 200610008722 A CN200610008722 A CN 200610008722A CN 100566226 C CN100566226 C CN 100566226C
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Abstract
The invention discloses a kind of method and system that is used for the optional closed loop mechanism of realization employing Adaptive Modulation in multiple-input, multiple-output (MIMO) the wireless lan (wlan) system.Described system comprises receiver, for a plurality of spatial flows are selected modulation type and/or encoding rate.Described receiver transmits information by radio-frequency channel, and described information comprises a plurality of described modulation types and described encoding rate.Described receiver is configured to receive data subsequently based at least one the described modulation type selected and described encoding rate.On the other hand, described system comprises reflector, receives message by the RF channel, and described message comprises a plurality of modulation types of a plurality of spatial flows and/or the explanation of encoding rate.Described reflector is configured to send data subsequently based on described modulation type and/or encoding rate.
Description
Technical field
The present invention relates to radio communication, more specifically, the present invention relates to a kind of method and system that is used for the optional closed loop mechanism of realization employing Adaptive Modulation in multiple-input, multiple-output (MIMO) the wireless lan (wlan) system.
Background technology
Institute of Electrical and Electric Engineers (IEEE) has defined a plurality of standards that relate to wireless network in IEEE 802.11 resolutions (being called 802.11 again).Utilize existing 802.11 standards, as 802.11 (a) (b) (g), can support in 2.4GHz or the 5GHz frequency band the data transmission rate of the highest 54Mbps, ieee standard is set up and has been found a new 802.11n of seminar, to support to be higher than the data transmission rate of 100Mbps.The standard that wherein comes into question comprises that receiving the base station can be transmitted into the closed-loop feedback mechanism that receives signal of base station to help the transmitting base station adjustment by feedback information to transmitting base station.
In closed loop feedback system, transmitting base station can utilize the feedback information emission signal afterwards that receives the base station, is called wave beam forming (beamforming).Wave beam forming be a kind of order about signal to a certain specific direction so that receiver receives this signal more reliably, have lower noise and interference.In order to meet the demand of new features and performance, the various new feedback mechanism motions based on 802.11n have appearred, and to satisfy the demand of new features and performance, make mobile terminal receive can feed back relevant information and give the emission portable terminal.The feedback of relevant information can make the emission portable terminal adjust its emission mode based on the feedback information that mobile terminal receive provides.The main target of communication system is to make between emission mobile base station and mobile terminal receive to reach higher rate of information transmission, realizes lower Packet Error Ratio (PER) simultaneously.However, at present still do not have these shortcomings of suitable solution and satisfy in the WLAN method the demand of these new features and performance.
Relatively after the system of the present invention below in conjunction with the accompanying drawing introduction, the further limitation of existing and traditional method and shortcoming are clearly for a person skilled in the art.
Summary of the invention
The present invention has introduced a kind of system and/or method that is used for the optional closed loop mechanism of realization employing Adaptive Modulation in multiple-input, multiple-output (MIMO) the wireless lan (wlan) system in conjunction with the accompanying drawings and embodiments.
According to an aspect of the present invention, provide a kind of method that in MIMO communication system, transmits information, having comprised:
For a plurality of spatial flows that will launch select modulation types and encoding rate the two one of at least;
Transmit message by radio-frequency channel, described message comprises a plurality of described modulation types and described encoding rate;
According to described modulation type and described encoding rate the two one of at least, the configuration receiver is to receive data subsequently.
Preferably, described method also comprises by RF channel reception message.
Preferably, described method also comprises by RF channel reception message, described message is included in the described data of receiving subsequently, comprising having the two explanation one of at least of one described modulation type in a plurality of spatial data of receiving and described encoding rate.
Preferably, described modulation type and described encoding rate the two include one of at least to one in the described a plurality of spatial flows that will launch and to one explanation corresponding in a plurality of spatial flows that receive.
Preferably, described method also comprises pointing out whether to use wave beam forming to come to send the described data of receiving subsequently by message.
Preferably, described method also comprises whether point out to use channel feedback information when sending described subsequently data that receive by message.
Preferably, described method also comprise based at least one signal to noise ratio select described modulation type and described encoding rate the two one of at least.
According to an aspect of the present invention, provide a kind of method that in MIMO communication system, transmits information, having comprised:
Receive message by the RF channel, comprising having to a plurality of modulation types of a plurality of spatial flows that will launch and the explanation of encoding rate;
The two is configured reflector one of at least based on described modulation type and described encoding rate, with emission data subsequently.
Preferably, described method also comprises by described RF channel transmission message.
Preferably, described method also comprises by RF channel transmission message, described message is included in the data subsequently of described transmission, comprising having the two explanation one of at least of one described modulation type at least a portion of launching in a plurality of spatial flows and described encoding rate.
Preferably, described modulation type and described encoding rate the two include one of at least to one in a plurality of spatial flows that will launch and to one explanation corresponding at least a portion of launching described in described a plurality of spatial flows.
Preferably, described method also comprises pointing out whether to use wave beam forming to come to send the described data of receiving subsequently by message.
Preferably, described method also comprises whether point out to use channel feedback information when sending described subsequently data that receive by message.
Preferably, described method also comprise based at least one signal to noise ratio select described modulation type and described encoding rate the two one of at least.
According to an aspect of the present invention, provide a kind of system that in MIMO communication system, transmits information, having comprised:
Receiver, for a plurality of spatial flows that will launch select modulation types and encoding rate the two one of at least;
Described receiver transmits information by radio-frequency channel, and described information comprises a plurality of described modulation types and described encoding rate;
The two is configured to receive data subsequently one of at least described receiver based on described modulation type and described encoding rate.
Preferably, described receiver receives message by the RF channel.
Preferably, described receiver receives message by the RF channel, and described message is included in the described data of receiving subsequently, comprising having the two explanation one of at least of one described modulation type in a plurality of spatial data of receiving and described encoding rate.
Preferably, described modulation type and described encoding rate the two include one of at least to one in the described a plurality of spatial flows that will launch and to one explanation corresponding in a plurality of spatial flows that receive.
Preferably, whether described receiver receives and uses wave beam forming to come to send by message the indication of the described data of receiving subsequently.
Preferably, whether described receiver receives the indication of using channel feedback information when sending described subsequently data that receive by message.
Preferably, described receiver based at least one signal to noise ratio select described modulation type and described encoding rate the two one of at least.
According to an aspect of the present invention, provide a kind of system that in MIMO communication system, transmits information, having comprised:
Reflector receives message by the RF channel, and described message comprises a plurality of modulation types of a plurality of spatial flows that will launch and the explanation of encoding rate;
The two is configured to send data subsequently one of at least described reflector based on described modulation type and described encoding rate.
Preferably, described reflector sends message by described RF channel.
Preferably, described reflector sends message by the RF channel, described message is included in the data subsequently of described transmission, comprising having the two explanation one of at least of one described modulation type at least a portion of launching in a plurality of spatial flows and described encoding rate.
Preferably, described modulation type and described encoding rate the two include one of at least to one in a plurality of spatial flows that will launch and to one explanation corresponding at least a portion of launching described in described a plurality of spatial flows.
Preferably, whether described reflector points out to use wave beam forming to come to send the described data of receiving subsequently by message.
Preferably, whether described reflector points out to use channel feedback information when sending described subsequently data that receive by message.
Preferably, described reflector based at least one signal to noise ratio select described modulation type and described encoding rate the two one of at least.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the block diagram according to reflector in the one embodiment of the invention mimo system and receiver;
Fig. 2 is the block diagram that is used for the receiver of the reflector of employing Adaptive Modulation of mimo system and corresponding employing adaptive demodulation according to one embodiment of the invention;
Fig. 3 is the schematic diagram according to the information exchange in the one embodiment of the invention channel detection structure;
Fig. 4 is the schematic diagram that is used for the training sequence of Adaptive Modulation according to one embodiment of the invention;
Fig. 5 is the schematic diagram of the current configuration of SIG-N field according to an embodiment of the invention;
Fig. 6 a is the schematic diagram of the change according to an embodiment of the invention the SIG-N field done;
Fig. 6 b is the schematic diagram of the first of configuration field according to an embodiment of the invention;
Fig. 6 c is the schematic diagram of the second portion of configuration field according to an embodiment of the invention;
Fig. 7 is the flow chart of the step that adopted during by receiver request closed loop modulation type according to one embodiment of the invention;
Fig. 8 is the flow chart of the step that adopted when determining the closed loop modulation type from the channel feedback of receiver by reflector according to one embodiment of the invention;
Fig. 9 is the flow chart of the step that adopted when determining the open-loop modulation type according to one embodiment of the invention by reflector.
Embodiment
Specific embodiment of the present invention relates to a kind of method and system that is used for the optional closed loop mechanism of realization employing Adaptive Modulation in multiple-input, multiple-output (MIMO) the wireless lan (wlan) system, utilizes channel detection mechanism transmission information between reflector and receiver.
Various embodiments of the present invention are used a kind of new channel detection mechanism in the closed-loop system that can realize Adaptive Modulation and wave beam forming.Based on the scope of SNR value, can select modulation type and encoding rate for each stream adaptively.Reflector can be selected modulation type and encoding rate based on channel feedback information.
According to one embodiment of the present of invention, by channel information, but mimo system can be based on adherence to standard more efficient use channel.But in an example of adherence to standard, compare with the RF channel that has than low signal-to-noise ratio (SNR), the RF channel with higher SNR can be supported higher data transmission rate.Can support system's (or closed-loop system) of the feedback information exchange from the receiver to the reflector but use characteristic wave beam forming (Eigenbeamforming) or " wave beam forming " order about wave beam, make signal energy concentrate on the direction of expectation.Reflector transmit in the employed a plurality of RF channels of data to receiver any one be called " down channel ", and receiver transmits data to reflector and uses in a plurality of RF channels any one to be called " up channel ".
Adaptive modulation and coding rate technology can together be used with the wave beam forming technology, makes a plurality of signals or " stream " that comprise the different pieces of information amount to send simultaneously.Modulation and/or encoding rate can flow for unit to be selected effectively, and can be based on channel information to modulation and encoding rate or wherein any one is made amendment.
An object of the present invention is to select modulation and/or encoding scheme based on each stream, the total rate of information transmission maximization with the information that will transmit simultaneously by a plurality of RF channels minimizes Packet Error Ratio (PER) simultaneously.The SNR performance of each RF channel of this needs assessment, and be each RF channel adjustment modulation and/or encoding scheme based on SNR, and need to adopt data transfer rate maximization standard.The typical index of signal quality comprises for example SNR and PER.
Fig. 1 is the block diagram according to reflector in the one embodiment of the invention mimo system and receiver.Be illustrated in figure 1 as reflector 100 and receiver 101.Reflector 100 comprise coding module 102, shrink process (puncture) module 104, interleaver module 106, a plurality of mapper module 108a ..., 108n, a plurality of invert fast fourier transformation (IFFT) module 110a ..., 110n, wave beam forming V matrix module 112 and a plurality of digital-to-analogue conversion and antenna front-end module 114a ..., 114n.Receiver 101 comprise a plurality of antenna front ends and analog-to-digital conversion module 116a ..., 116n, wave beam forming U
*Matrix module 118, a plurality of fast Flourier (FFT) conversion module 120a ..., 120n, channel estimation block 122, equalizer module 124, a plurality of separate mapping block 126a ..., 126n, release of an interleave module 128, separate shrink process module 130 and Viterbi (Viterbi) decoder module 132.
Variable V in the wave beam forming module 112 and 118 and U
*Be respectively the matrix that adopts in the wave beam forming technology.The applying date is that the U.S. Patent application No.11/052389 (act on behalf of case number for 16307US02) on February 7th, 2005 provides the detailed description to the eigen beam figuration, quotes in full this application at this.
In reflector 100, the binary system input block that coding module 102 can adopt forward error correction (FEC) technology (for example, binary system convolutional encoding (BCC)) conversion to receive.Use FEC technology (being also referred to as " chnnel coding "), can improve the ability of successfully restoring the data of emission in receiver, this realizes by before data are by the RF channels transmit input data being added redundant information.The ratio of the bit number in the data block after bit number in the binary system input block and the conversion is encoding rate.This encoding rate can be write i
b/ t
b, t wherein
bRepresentative comprises total bit number of a set of coded bits, i
bRepresent this group bit t
bIn the quantity of the information bit that comprises.(t
b-i
b) individual bit is redundant digit, this redundant digit can make receiver 101 detect and correct the mistake of introducing in the emission process.The quantity that increases redundant digit can strengthen the ability that receiver detected and corrected the information bit mistake.The inconvenience that Error detection that this is extra and correction capability are brought is that it has reduced the rate of information transmission between reflector 100 and the receiver 101.The present invention is not limited only to BCC, can also use multiple coding techniques, for example Turbo coding or low-density checksum (LDPC) coding.
Shrink process module 104 can receive the binary system input block after the conversion from coding module 102, and changes encoding rate by removing redundant bit the binary system input block after the conversion that receives.For example, if the encoding rate that coding module 102 is carried out is 1/2, the data of 4 bits that receive from coding module 102 comprise 2 information bits and 2 redundant digits.By removing 1 redundant digit in these 4 bits, shrink process module 104 can be adjusted to 2/3 from 1/2 with encoding rate.Before passing through the RF channels transmit, interleaver module 106 can rearrange the bit in the adjusted data block of encoding rate that receives from shrink process module 104, to be reduced in by causing the possibility of data that can not error correction because of burst error in the process of RF channels transmit and to the influence of contiguous bits.The output of interleaver module 106 can also be divided into a plurality of data flow, and wherein each data flow comprises the non-overlapped part that the bit of data block after the adjustment of the encoding rate of reception is arranged.Therefore, for amount of bits b given in the data module after the encoding rate adjustment
Db, the given quantity data stream n of interleaver module 106 outputs
St, and the bit b that gives determined number that distributes to individual traffic i by interleaver module 106
St(i),
Before interlocking, for the coded-bit b that gives determined number
Db, each bit can be with an index k=0,1...b
Db-1 represents.Interleaver module 106 can be given first spatial flow, spatial flow 0, b with Bit Allocation in Discrete
St(0), wherein the bit index is k=0, n
St, 2*n
St..., b
Db-n
StBut interleaver module 106 allocation bit are given spatial flow 1, bs
t(1), the bit index is k=1, n
St+ 1,2*n
St+ 1 ..., b
Db-n
St1+1.But interleaver module 106 allocation bit are given spatial flow 2, bs
t(2), the bit index is k=2, n
St+ 2,2*n
St+ 2 ..., b
Db-n
St1+1.But interleaver module 106 allocation bit are given spatial flow n
St, bs
t(n
St), the bit index is n
St-1,2*n
St-1,3*n
St-1...b
Db-1.
A plurality of mapper module 108a ..., 108n comprises the mapper module that some is independent, its quantity equals the quantity of the individual traffic that interleaver module 106 generates.Each mapper module 108a ..., 108n can receive a plurality of bits from the individual traffic of correspondence, adopt described a plurality of bits switch to be become the signal level of conventional letter, thereby these bits be mapped as symbol based on the modulation technique of trooping.The expression of this symbol can be a complexor, comprises homophase (I) and quadrature (Q) component.The mapper module 108a that shines upon for data flow i ..., 108n can utilize modulation technique with a plurality of bit b
St(i) be mapped as symbol.
Wave beam forming V matrix module 112 the wave beam forming technology can be applied to a plurality of mapper module 108a ..., on the 108n a plurality of symbols or " spatial model " that generate.Wave beam forming V matrix module 112 can generate a plurality of signals, and wherein, the quantity that generates signal equals the quantity of transmitting antenna in the reflector 100.In a plurality of signals that wave beam forming V matrix module 112 generates each can comprise at least one from mapper module 108a ..., the weighted sum of the signal received of 108n.
A plurality of IFFT module 110a ..., 110n can receive a plurality of signals from wave beam forming module 112.Each IFFT module 110a ..., 110n can be subdivided into the bandwidth of RF channel a n sub-bands of frequencies to realize OFDM (OFDM), the symbol that equals number of sub-bands of a plurality of receptions of buffer memory.Each signal that is buffered can be by modulating based on the carrier signal of a sub-bands of frequencies.Then, each IFFT module 110a ..., 110n in the whole frequency subband separately corresponding cache with the modulation symbol carry out being carried out n point IFFT mutually separately, thereby generate compound ofdm signal.
A plurality of numbers (D) moulds (A) conversions and antenna front-end module 114a ..., 114n can receive a plurality of IFFT module 110a ..., a plurality of signals of 110n generation.Each IFFT module 110a from a plurality of ..., the digital form signal that receives of 110n can be exchanged into analog rf signal, and launches by antenna after amplification.A plurality of DA conversion and antenna front-end module 114a ..., 114n quantitatively equals the quantity of transmitting antenna in the reflector 100.DA conversion and antenna front-end module 114a ..., among the 114n each all can receive from a signal among wave beam forming V matrix module 112 a plurality of, and use antenna to pass through RF signal of RF channels transmit.
In receiver 101, a plurality of antenna front ends and analog-to-digital conversion module 116a ..., 116n receives analog rf signal by antenna, is base band frequency with this RF conversion of signals, and generates the digital equivalents of the analog baseband signal of described reception.This digital signal can be a complexor, comprises I and Q component.Antenna front end and analog-to-digital conversion module 116a ..., the quantity of 116n can be identical with the reception antenna quantity of receiver 101.
A plurality of FFT module 120a ..., 120n can from a plurality of antenna front ends and AD modular converter 116a ..., 116n receives a plurality of signals.Many days FFT module 120a ..., 120n quantitatively equal antenna front end and AD modular converter 116a ..., the quantity of 116n.Each FFT module 120a ..., 120n can from antenna front end and AD modular converter 116a ..., a received signal among the 116n, independently use n point FFT technology, and use a plurality of carrier signals based on n the sub-bands of frequencies of using in the reflector 100, this signal is carried out rectification.Signal after the demodulation can be on a subband frequency period by each FFT module 120a ..., 120n carries out the mathematics integration to it, to extract n the symbol that is included in each ofdm signal that receiver 101 receives.
Wave beam forming U
*Module 118 can to from a plurality of FFT module 120a ..., the signal application wave beam forming technology received of 120n.Wave beam forming U
*Module 118 can generate a plurality of signals, and wherein, the quantity that generates signal equals to be used for generating at reflector 100 quantity of the spatial flow of signal.Wave beam forming U
*Each signal that module 118 generates in a plurality of all comprise at least one from FFT module 120a ..., the weighted sum of the signal received of 120n.
A plurality of separate mapping block 126a ..., 126n can be from equalizer module 124 receiving symbols, and based on the modulation technique of using in the reflector 100 that is used to generate this symbol, use the rectification technology, oppositely shining upon each symbol is one or more binary bits.A plurality of separate mapping block 126a ..., 126n quantitatively equals in the reflector 100 quantity of stream.
Release of an interleave module 128 can from each separate mapping block 126a ..., 126n receives a plurality of bits, and described a plurality of bits resequenced.For example, the reverse sequence of the order that can use according to the interleaver in the reflector 100 106 of release of an interleave module 128 to a plurality of separate mapping block 126 ..., the bit that generates of 126n resequences.Separating shrink process module 130 inserts the room that removed by shrink process module 104 in the output block of release of an interleave module 128 receptions.Viterbi decoder module 132 adopts and the decoding technique that the binary data blocks that inputs to coding module 102 is restored can be decoded to the output block of separating shrink process.
Fig. 2 is the block diagram according to the receiver of the employing adaptive demodulation of reflector that adopts Adaptive Modulation in the one embodiment of the invention mimo system and correspondence.With reference to Figure 2 shows that reflector 200 and receiver 201.Reflector 200 comprises that emission modulation control module 236 reaches as a plurality of modules in the reflector among Fig. 1 100.Receiver 201 comprises a plurality of modules in the receiver 101 among receiving demodulation control module 234 and Fig. 1.The selection of the modulation technique that emission modulation control module 236 may command reflectors 200 use.The selection of the demodulation techniques that receiving demodulation control module 234 may command receivers 201 use.In the course of the work, emission modulation control module 236 can to each mapping block 108a ..., 108n controls based on the modulation technique that each data flow is used respectively.Receiving demodulation control module 234 can to each separate mapping block 126a ..., 126n controls based on the demodulation techniques that each data flow is used respectively.
In the course of the work, mapping block 108a ..., the amount of bits b of 108n based on the one or more data flow of control controllable sub dispensing of each data flow
St(i), to guarantee that total number of bits amount in a plurality of data flow equals the total amount of bits b in the adjusted data block of encoding rate
Db, shown in equation 1.
In one aspect of the invention, a kind of system that is used for the information of transmitting in the MIMO communication system can comprise the receiver that can be a plurality of spatial flows selection modulation types and/or encoding rate.This receiver can pass through RF channel transfer at least one message, wherein comprises a plurality of modulation types and/or encoding rate.This receiver also can be used for based at least one modulation type of choosing and/or encoding rate reception data subsequently.
The system that is used to the information that transmits in the MIMO communication system also can comprise the reflector that receives message by the RF channel on the other hand, and this message comprises the relevant a plurality of modulation types of a plurality of spatial flows and/or the explanation of encoding rate.This system also can be used for based at least one modulation type of receiving and/or encoding rate emission data subsequently.
Channel detection comprises several different methods, by channel detection, reflector for example reflector 200 can with receiver receiver 201 exchange message in closed-loop system for example.Reflector can use the information of exchange, and so, reflector just can be launched subsequently data based on a kind of modulation type and/or encoding rate.The information of exchange can be used for disposing receiver, makes it receive subsequently data based on a kind of modulation type and/or encoding rate.Channel detection makes reflector and receiver to transmit and receive data based on shared modulation type and/or encoding rate.
In mimo system, embodiments of the invention can so that reflector for example reflector 200 and receiver for example receiver 201 utilize channel detection mechanism to come exchange message, in this information, specified the modulation type and/or the encoding rate that are used for each a plurality of spatial flows.The information of exchange can be used for disposing reflector and launches subsequently data based on a kind of modulation type and/or encoding rate by the single spatial flow in a plurality of spatial flows.The information of exchange also can be used for disposing receiver and receives subsequently data based on a kind of modulation type and/or encoding rate by the single spatial flow in a plurality of spatial flows of receiving accordingly.Channel detection can be so that reflector be launched by single spatial flow based on shared modulation type and/or encoding rate, and receiver receives by corresponding single spatial flow based on this shared modulation type and/or encoding rate.
Fig. 3 is the schematic diagram of the information exchange in the channel detection structure according to an embodiment of the invention.Reflector 302, receiver 304, channel information request message 306, channel information response message 308, the modulation type that uses selection and/or transmission data 310, the acknowledge message 312 of encoding rate have been shown among Fig. 3.Reflector 302 can be to receiver 304 send channel information request messages 306.After receiving channel information request message 306, receiver 304 can be the RF channel or the reflector 302 of down direction communication use and estimates channel and interface level to the down channel of receiver 304.After receiving channel information request message 306, receiver 304 can be handled channel information request message 306, to calibrate.Information from receiver 304 can be used for by RF channels transmit channel response message 308, and this RF channel is used for the communication of up direction, or from receiver 304 to reflector 302 up channel.The channel information response message includes in a plurality of spatial flows of being received by down channel by receiver 304 the signal to noise ratio (snr) information of each.Channel information response message 308 also can include each modulation type of asking and/or encoding rate in a plurality of spatial flows of being received by down channel by receiver 304.Information in the channel information response message 308 can be launched device 302 and be used to select data transfer rate, uses specific encoding rate and/or modulation type based on the feedback channel information of receiving from receiver 304 for each spatial flow.Reflector 302 can be handled these channel information response messages 308, to calibrate.In the process of send channel information request message 306 or channel information response message 308, can not use wave beam forming.
The embodiment of channel information request message 306 can include but not limited to, MIMO mode request frame or mimo channel claim frame.The embodiment of channel information response message 308 can include but not limited to MIMO mode response frame or mimo channel response frame.Use the frame structure of the channel detection mechanism of MIMO mode request frame, mimo channel claim frame, MIMO mode response frame and mimo channel response frame in the applying date is the U.S. Patent application No.11/052353 on February 7th, 2005, to introduce, quote in full the content of this application at this.A piece of news can comprise one or more frames.
The data that reflector 302 can be launched subsequently are the modulation type of use selection and/or the transmission data or the transmission data-message 310 of encoding rate.Send data-message 310 and comprise SIGNAL-N (SIG-N) field, wherein comprise a plurality of modulation types of a plurality of spatial flows and/or the explanation of encoding rate type.In closed-loop MIMO system, a plurality of modulation types of appointment and/or in the encoding rate type each are based on the channel feedback that is included in the channel information request response 308 (for example MIMO mode response frame) in the signal SIG-N field.Be included in the data subsequently that send in the data-message 310 if receiver 304 can successfully receive, just send acknowledge message 312 by up channel.
In the open loop MIMO system, reflector 302 is channel information request message 306 not, does not also use the information channel information response message 308 from receiver 304.As an alternative, can to use " rollback (backoff) " method be that a plurality of spatial flows are selected modulation types and/or encoding rate to reflector.In an open cycle system, reflector can be selected modulation type and/or encoding rate used when the receiver emission sends data-message 310.Send data-message 310 if receiver successfully receives, will send acknowledge message 312.After receiving acknowledge message 312, modulation type and/or the encoding rate selected before reflector can be revised are to increase the data transfer rate of transmission data-message 310 subsequently.Send data-message 310 if receiver fails to receive, just can not send acknowledge message 312.If reflector is not received acknowledge message 312, modulation type and/or the encoding rate selected before reflector will be revised are to reduce the data transfer rate of transmission data-message 310 subsequently.
Fig. 4 is the schematic diagram that is used for the training sequence of Adaptive Modulation according to one embodiment of the invention.First antenna 400, second antenna 401 have been shown among Fig. 4.The PPDU that first antenna 400 sends includes short sequence field 402, training symbol protection interval (GI2) field 404, long sequence field 406, protection (GI) field 408, SIG-N field 410, a plurality of protection interval field 412a...412b and a plurality of data field 414a...414b at interval.The PPDU that second antenna 401 sends includes short sequence field 422, training symbol protection interval field 424, long sequence field 426, protection interval field 428, SIG-N field 430, a plurality of protection interval field 432a...432b and a plurality of data field 434a...434b.PPDU includes packet header and data load.Physical layer service data (PSDU) includes data load.The lead code of the PSDU that first antenna 400 sends comprises short sequence field 402 and long sequence field 406.The header part of the PPDU that first antenna 400 sends comprises SIG-N field 410.The data load of the PSDU that first antenna 400 sends comprises a plurality of data field 414a...414b.The lead code of the PPDU that second antenna 401 sends comprises short sequence field 422 and long sequence field 426.The header part of the PPDU that second antenna 401 sends comprises SIG-N field 430.The data load of the PSDU that second antenna 401 sends comprises a plurality of data field 434a...434b.
Training symbol protection interval field 404 comprises a time interval, and during this time every interior, first antenna 400 does not send data by the RF channel.The duration of training symbol protection interval field 404 comprises time interval of 1.6 μ s for example.Receiver for example receiver 304 can use training symbol protection interval field 404 to reduce the possibility that the intersymbol interference between last symbol (symbol that sends during for example short sequence field 402) and the successive character (symbol that sends during for example long sequence field 406) takes place.
Signal SIG-N field 410 comprises, for example a signal code.Each signal code can comprise the interval of definition time of message transmission, for example 3.2 μ s.The duration of signal code comprises duration of signal SIG-N field 410 and last protection interval field 408, is time interval of 4 μ s for example.Receiver for example receiver 304 can use signal SIG-N field 410 to set up and receive the relevant a plurality of configuration parameters of physical layer service data (PSDU) by the RF channel.
A data field among a plurality of data field 414a...414b comprises for example data symbol.Each data symbol comprises the interval of definition time of first antenna, 400 transmission information, for example 3.2 μ s.The duration of each data break, comprise duration of the last protection interval data field in the data field and a plurality of protection interval field 414a...414b among a plurality of data field 414a...414b being for example time interval of 4 μ s.Receiver for example receiver 304 uses a plurality of data field 414a...414b to receive information in the PSDU data load that receives by the RF channel.
Each data field among a plurality of data field 434a...434b can comprise for example data symbol.Each data symbol comprises the interval of definition time that second antenna 401 information of carrying out transmits, for example 3.2 μ s.The duration of each data break comprises the data field among a plurality of data field 434a...434b and the duration of the last protection interval field among a plurality of protection interval field 432a...432b, is time interval of 4 μ s for example.Receiver for example receiver 304 can use a plurality of data field 434a...434b to receive the information that is included in the PSDU data load of receiving by the RF channel.
In the course of the work, lacking sequence field 402 stipulates in IEEE scheme 802.11 with long sequence field 406.Short sequence field and long sequence field can be by for example first antenna, 400 transmissions of reflector 302 of reflector, by for example receiver 304 receptions of receiver.For example, receiver can compare the long sequence field received and known desired value, determines to occur in down channel the degree of transmission impairment.Channel estimation value can obtain from this down channel.This channel estimation value comprises SNR information, and comprises the information about the single spatial flow that transmits by down channel.
Known modulation type and encoding rate transmission can be used in lead code part and the header part of the PPDU that transmits by first antenna 400.Use known modulation type and encoding rate can make reflector for example reflector 302 and receiver for example receiver 304 communicate, exchange up to modulation type and encoding rate information.This modulation type comprises binary phase shift keying (BPSK).This encoding rate can be 1/2.This modulation type and encoding rate can be represented the lowest data rate that data send by spatial flow in the RF channel.Channel information request message 306 and channel information response message 308 can use the modulation type and the encoding rate of each emission space stream to send.The PSDU header part that comprises signal SIG-N field 410 and a plurality of data field 414a...414b of first antenna transmission includes physical layer service data (PSDU).
Wave beam forming (being also referred to as the eigen beam figuration) can be used for sending in the transport process of data-message 310, and promptly when long training sequence (LTS) began, its corresponding training symbol was protected beginning of 404 at interval.As selection, can also when beginning to receive data load, when just correspondence is protected the beginning of interval 412a, use wave beam forming.Receiver for example receiver 304 and reflector for example reflector 302 exchanged channel detection message (comprising for example channel information request message 306 and channel information response message 308) afterwards, receiver can determine that the PSDU that receives has used wave beam forming to send.Based on signal SIG-N field 410, receiver can determine that the frame of receiving has used Adaptive Modulation to handle.Adaptive Modulation comprises based on the channel feedback information in the closed-loop MIMO system revises at least one modulation type and/or encoding rate at least one emission space stream.
Lead code part and the header part of PPDU by the emission of second antenna 401 can use a kind of modulation type and encoding rate to send.The use of this modulation type and encoding rate can make reflector for example reflector 302 and receiver for example receiver 304 communicate, exchange up to modulation type and encoding rate information.This modulation type comprises binary phase shift keying (BPSK).This encoding rate can be 1/2.This modulation type and encoding rate can be represented the lowest data rate that data can send by spatial flow in the RF channel.Channel information request message 306 and channel information response message 308 can use the modulation type and the encoding rate of each emission space stream to send.The PSDU header part that comprises signal SIG-N field 430 and a plurality of data field 434a...434b of first antenna transmission can comprise physical layer service data (PSDU).
Wave beam forming (being also referred to as the eigen beam figuration) can be used for sending in the transport process of data-message 310, and promptly when long training sequence (LTS) began, its corresponding training symbol was protected beginning of 424 at interval.As selection, can also when beginning to receive data load, when just correspondence is protected the beginning of interval 432a, use wave beam forming.Receiver for example receiver 304 and reflector for example reflector 302 exchanged channel detection message (comprising for example channel information request message 306 and channel information response message 308) afterwards, receiver can determine that the PSDU that receives has used wave beam forming to send.Based on signal SIG-N field 430, receiver can determine that the frame of receiving has used Adaptive Modulation to handle.Adaptive Modulation comprises based on the channel feedback information in the closed-loop MIMO system revises at least one modulation type and/or encoding rate at least one emission space stream.
Fig. 5 is the schematic diagram of the current configuration of SIG-N field according to an embodiment of the invention.Figure 5 illustrates reserved field (RSVD) 502, configuration field 504, length (LEN) field 506), last PSDU indicating device (LPI) field 508, RSVD field 510, Cyclic Redundancy Check field 512 and tail field 514.Reserved field 502 comprises the binary message of 6 bits.Reserved field 510 comprises the binary message of 8 bits.The still unallocated purposes of reserved field 502 and 510.Configuration field 504 comprises the binary message of 16 bits.Configuration field 504 includes and passes through for example configuration information of the signal correction of antenna 400 transmissions of antenna.
Configuration field 504 includes to be used for indicating being used for transmitting and is included in the reflector for example 302 and information of the quantity of the spatial flow of the information of the message that for example transmits between 304 of receiver.Configuration field 504 includes to be used to indicate and is used between reflector and receiver transmitting for example information of antenna 400 and 401 quantity of information emission antenna.Configuration field 504 includes the information that is used to indicate employed bandwidth when being used for sending information between reflector and receiver.Configuration field 504 includes the information that is used to indicate by antenna employed encoding rate when for example antenna 400 sends information.Configuration field 504 includes the information that is used for indicating by the employed error correcting code type of antenna transmission information process.Configuration field 504 includes the information that is used for indicating by employed group type of antenna transmission information process or modulation type.
Length field 506 comprises the binary message of 13 bits.Length field 506 includes and is used for indicating by the antenna information of the binary system eight bit byte quantity of the data field 414a...414b data load information that sends of antenna 400 for example.Indicating device LPI field 508 comprises the binary message of 1 bit.Indicating device LPI field 508 includes and is used in reference to the registration lotus (for example a plurality of data field 414a...414b) of refusing to take a passenger and whether represents to be included in the information of the last information in the message.Cyclic redundancy check field 512 comprises the binary message of 4 bits.Cyclic redundancy check field 512 include by receiver for example receiver 304 be used for detecting and have wrong information among the PPDU (for example packet header SIG-N field 410) that receives.Tail field 514 comprises the binary message of 6 bits.Tail field 514 includes the information that is filled to desired length after the cyclic redundancy check field 512, with the SIG-N field that is attached to.
Fig. 6 a is the schematic diagram of the change the SIG-N field done according to one embodiment of the invention.Configuration field 602, closed loop (clsd) field 604, length field 608, indicating device LPI field 610, reserved field 612, cyclic redundancy check field 614 and tail field 616 have been shown among Fig. 6 a.Reserved field 612 comprises the binary message of 4 bits.The purposes of reserved field 612 is still unallocated.The effect of length field 606 such as length field 506.The effect of indicating device LPI field 610 such as indicating device LPI field 508.The effect of cyclic redundancy check field 614 such as cyclic redundancy check field 512.The effect of tail field 616 such as tail field 514.
With reference to figure 5 and comparison diagram 6a as can be known, reserved field 502 and 510 is total up to 14 bits in Fig. 5, and the reserved field 612 among Fig. 6 a is 4 bits.Therefore, the reserved field 612 in the signal SIG-N field among Fig. 6 a lacks 10 bits than total bit number of reserved field 502 in the signal SIG-N field among Fig. 5 and 510.In the SIG-N field shown in Fig. 6 a, comprise 9 extra bits, this be used in the configuration field 602 to by antenna for example each in a plurality of spatial flows of antenna 400 emissions the modulation type explanation is provided.Closed loop field 604 comprises the binary data of extra 1 bit.Therefore, signal SIG-N field shown in Figure 5 and the signal SIG-N field shown in Fig. 6 a binary bits that comprises same quantity.
Fig. 6 b is the schematic diagram of the first of configuration field according to an embodiment of the invention.Be depicted as a certain amount of spatial flow field 622, a certain amount of transmitting antenna field 624, bandwidth field 626, code rate field 628, error correcting code type field 630 and the first group type field 632 as Fig. 6 b.
Spatial flow field 622 comprises the binary data of 3 bits.Spatial flow field 622 can be indicated reflector for example 302 and the receiver quantity of the employed spatial flow of transmission information between 304 for example.In mimo system, the quantity of spatial flow can be represented a numeral, for example 1,2,3 or 4.Transmitting antenna field 624 comprises the binary data of 3 bits.The employed transmitting antenna quantity of antenna 400 for example when transmitting antenna field 624 can be indicated between reflector and the receiver information of transmission.In mimo system, the quantity of transmitting antenna can be represented a numeral, for example 1,2,3 or 4.Bandwidth field 626 comprises the binary data of 2 bits.Bandwidth field 626 can be indicated the employed bandwidth of transmission information between reflector and the receiver.In mimo system, the bandwidth field can be represented bandwidth, for example 20MHz or 40MHz.Code rate field 628 comprises the binary data of 3 bits.The encoding rate that uses when code rate field 628 can be indicated by antenna transmission physical layer service data (PSDU).In mimo system, encoding rate can be represented a numeral, for example 1/2,2/3,3/4 or 5/6.Error correcting code type field 630 comprises the binary data of 2 bits.Employed error correcting code type when error correcting code type field 630 can be indicated by antenna transmission information.In mimo system, the error correcting code type can be represented error correction/encoding method, for example binary system convolutional encoding (BCC) or low-density parity coding (LDPC).The first group type field 632 comprises the binary data of 3 bits.Employed group type or modulation type when the first group type field 632 can be indicated and be sent PSDU by antenna in first spatial flow.In mimo system, modulation type can represent to indicate the cluster of the quantity of the binary bits that is encoded to symbol, for example binary phase shift keying (BPSK), quaternary phase shift keying (QPSK), 16 quadrature amplitude modulations (16QAM), 64 QAM (64QAM) or 256 QAM (256QAM).
Fig. 6 c is the schematic diagram of the second portion of configuration field according to an embodiment of the invention.Be depicted as the second group type field 642, the 3rd group type field 644, the 4th group type field 646 as Fig. 6 c.The second group type field 642 comprises the binary data of 3 bits.The second group type field 642 can be indicated by antenna used group type or modulation type when for example antenna 400 transmits PSDU in second spatial flow.The 3rd group type field 644 comprises the binary data of 3 bits.Used group type or modulation type when the 3rd group type field 644 can be indicated and be transmitted PSDU by antenna in the 3rd spatial flow.The 4th group type field 646 comprises the binary data of 3 bits.Used group type or modulation type when the 4th group type field 646 can be indicated and be transmitted PSDU by antenna in the 4th spatial flow.
During work, in closed-loop MIMO system, receiver for example receiver 304 can use a plurality of fields that comprise the first group type field 632, the second group type field 642, the 3rd group type field 644 and the 4th group type field 646 to select at least one modulation type and/or encoding rate for a plurality of spatial flows.Receiver can be by antenna for example each spatial flow in a plurality of spatial flows of sending of antenna 400 select unique modulation type and/or encoding rate.Modulation type of selecting and encoding rate can be included in the channel information response message 308 by up channel and transmit.Reflector, for example reflector 302 can receive by RF channel the including of transmitting of the channel information response message 308 to the explanation of a plurality of modulation types of a plurality of spatial flows and/or encoding rate.Reflector can be configured to send data subsequently based at least one modulation type received from channel information response message 308 and/or encoding rate, for example includes the transmission data-message 310 of PSDU.
This modulation and/or encoding rate comprise one explanation in a plurality of spatial flows that receiver is received, and to the explanation of a spatial flow of the correspondence that sends as the part of at least a portion of a plurality of spatial flows by reflector.Reflector can receive a plurality of modulation types of a plurality of spatial flows and/or the explanation of encoding rate.Reflector can be specified a plurality of modulation types of a plurality of spatial flows and/or each in the encoding rate according to receiver then, uses a corresponding emission space stream in a plurality of emission space stream to send subsequently data.Reflector can receive a plurality of modulation types of a plurality of spatial flows and/or the explanation of encoding rate.Reflector can be according to the modulation type and/or the encoding rate of at least one appointment then, uses at least one spatial flow to transmit subsequently data.
In one embodiment of the invention, in closed-loop MIMO system, receiver for example receiver 304 can generate channel feedback information based at least one SNR of a plurality of spatial flows.The channel feedback information that generates can be included in the channel information response message 308 and transmit by up channel.Reflector for example reflector 302 can receive that to include based on receiver be the channel response message 308 of channel feedback information of at least one SNR of a plurality of spatial flow appointments.Reflector can be a plurality of spatial flows and selects corresponding a plurality of modulation type and/or encoding rate.Reflector can be configured based on the modulation type and/or the encoding rate (this modulation type and/or encoding rate are selected based on channel feedback information) of at least one selection, to send data subsequently, for example includes the transmission data-message 310 of PSDU.
In another embodiment of the present invention, in the open loop MIMO system, reflector for example reflector 302 can be a plurality of spatial flows and selects a plurality of modulation types and/or encoding rate.Reflector can be based upon modulation type that last emission data select and/or from showing of receiver the acknowledgement frame that has been successfully received of last transmission data be configured, to send data subsequently, for example send data-message 310.
No matter be in closed loop or open loop MIMO system, reflector for example reflector 302 can be to receiver receiver 304 transmission information for example, this information comprises the explanation to employed modulation type when the data that transmit by signal SIG-N message field (for example, be included among Fig. 6 a among the PSDU SIG-N field) subsequently and/or encoding rate type.The first group type field 632, the second group type field 642, the 3rd group type field 644 and the 4th group type field 646 include using by for example explanation of the modulation type in first spatial flow, second spatial flow, the 3rd spatial flow and the 4th spatial flow of the correspondence that sends of antenna 400 of transmitting antenna.Receiver can determine whether transmission data are subsequently arranged based on closed loop field 604 in closed loop or open cycle system.
If closed loop field 604clsd=0, and the quantity of the spatial flow (Nss) that spatial flow field 622 is represented approximates the quantity of the represented transmitting antenna (Ntx) of transmitting antenna field 624 greatly, perhaps lack one than it, this show reflector for example reflector 302 just do not using wave beam forming and using Space-division multiplexing (SDM) or space-time block code (STBC) to send data.If closed loop field 604clsd=1, and each group type field 632,642,644 comprises identical numerical value with 646, just show that the positive use characteristic wave beam forming of reflector sends data, but do not use stream to carry (streamloading), or use single Adaptive Modulation based on each stream.If do not use stream to carry, each spatial flow can use identical modulation type, and the data transfer rate of each spatial flow equates.If used stream to carry, some spatial flows can use different modulation types so, and the data transfer rate of some spatial flows also can be different from other spatial flows.Adaptive Modulation can make reflector revise the data transfer rate of spatial flow, increases or reduce data transfer rate based on channel feedback information.In one embodiment of the invention, can be each spatial flow and adopt modulation type and/or encoding rate separately.
Usually, 604clsd equals at 1 o'clock in the closed loop field, and expression has used wave beam forming to transmit.Reflector for example reflector 302 can receive message by up channel, and this message comprises a plurality of modulation types of a plurality of spatial flows and/or the explanation of encoding rate.Reflector can use the modulation type of at least one appointment and/or encoding rate to flow the data that transmit subsequently by at least one emission space, and uses wave beam forming.If each group type field 632,642,644 and 646 does not include equal numerical value, and closed loop field clsd=1, this just shows that a plurality of spatial flows do not use same modulation type.
As closed loop field 604clsd=0, and do not have the probe message exchange, receiver can determine that the reflector that sends data subsequently is arranged in open cycle system, and reflector does not use channel feedback information, wave beam forming or Adaptive Modulation in this open cycle system.
Fig. 7 is the flow chart of the step that adopted during receiver request closed loop modulation type according to an embodiment of the invention.As shown in Figure 7, in step 702, receiver is each spatial flow computational geometry average SNR.In step 704, based on detected SNR and target Packet Error Ratio (PER), receiver is selected modulation type for each spatial flow.In step 706, receiver will feed back to reflector for the modulation type that each spatial flow is selected.Step 708 can determine whether based on feedback information transmission data subsequently.If not, so in step 716, reflector is not using under the situation of wave beam forming to receiver transmission data subsequently.In step 718, reflector is pointed out the modulation type into a plurality of spatial flows selections, and is pointed out that the modulation type of this selection is not to select based on the feedback information from receiver to receiver transmission data subsequently.
If the definite data subsequently of step 708 are based on the feedback information transmission, used wave beam forming, then step 710 will determine whether Adaptive Modulation is available.If then in step 712, reflector will be based on sending subsequently data to receiver from the feedback information of receiver, and point out the modulation type that used wave beam forming and spatial flow to select.If determine not use wave beam forming in the step 710, so in step 714, reflector is pointed out not use wave beam forming, and is pointed out that receiver is the modulation type that a plurality of emission space streams are selected based on sending subsequently data from the feedback information of receiver to receiver.
Fig. 8 is the flow chart of the step that adopted when determining the closed loop modulation type from the channel feedback of receiver of reflector according to an embodiment of the invention.As shown in Figure 8, in step 802, reflector receives the feedback information of the geometric average SNR that comprises each spatial flow from receiver.In step 804, reflector is based on SNR feedback information and target P ER, for each spatial flow is selected modulation type.In step 806, reflector is based upon the modulation type that each spatial flow is selected, to receiver transmission data subsequently.Follow-up step is with identical to introducing of step 708.
Fig. 9 is the flow chart of the step taked when determining the open-loop modulation type according to the one embodiment of the invention reflector.As shown in Figure 9, in step 902, reflector determines whether to use wave beam forming to send data.Whether reflector can based on current is using wave beam forming to carry out above-mentionedly determining.Reflector also can carry out above-mentioned definite based on the state of successful acknowledgement frame in the receiver.If the use wave beam forming, so in step 904, reflector determines whether to be each spatial flow assigned modulation type.If so in step 908, reflector will send subsequently data to receiver, point out to have used wave beam forming, and point out the modulation type selected into each spatial flow.If use wave beam forming but be not each spatial flow assigned modulation type, so in step 910, reflector will send subsequently data to receiver, point out to have used wave beam forming, and point out a modulation type into a plurality of spatial flows selections.If after step 902, do not use wave beam forming, so in step 906, reflector will send subsequently data to receiver, point out a modulation type selecting into a plurality of spatial flows, and point out that this modulation type is not to select based on the feedback information from receiver.
Therefore, the present invention can be realized by the combination of hardware, software or hardware and software.The present invention can realize at least one computer system in a concentrated manner, perhaps realizes with the distributed way of distribution of different parts in the computer system of several mutual connections.The computer system of any kind of or other equipment that can realize method of the present invention all are suitable for.A typical combination of hardware, software and firmware is the general-purpose computing system with computer program, when this computer program is uploaded and carried out, controls this computer system so that realize method of the present invention.
The present invention also can embed in the computer program that includes the various features that can realize described method, can realize the described method of the application when this program is loaded in the computer system.Described herein computer program is meant, for example, one group of instruction with any language, code or symbolic representation, can directly make system carry out specific function, perhaps through making system carry out specific function after the following a kind of or various processing: a) convert another kind of language, code or symbol to information processing capability with information processing capability; B) duplicate with different materials.But the implementation method of those of ordinary skill in the art's other computer programs as can be known also can be used for the present invention.
Below invention has been described in conjunction with certain embodiment, and those of ordinary skill in the art can carry out various changes or be equal to replacing and not departing from the scope of the present invention as can be known to the present invention.In addition, the various modifications of carrying out according to instruction of the present invention to adapt to particular environment or material do not depart from the scope of the present invention yet.Therefore, the present invention is not limited to disclosed specific embodiment, the present invention includes all embodiment that fall in the claim scope.
It is the U.S. Provisional Patent Application No.60/650 on February 7th, 2005 that the application quotes in full and require the applying date, 941 priority.
The application also quotes in full following application:
U.S. Patent application No.11/061,567, the applying date is on February 18th, 2005;
U.S. Patent application No.11/052,389, the applying date is on February 7th, 2005;
U.S. Patent application No.11/052,353, the applying date is on February 7th, 2005.
Claims (10)
1, a kind of method that transmits information in MIMO communication system comprises:
For a plurality of spatial flows that will launch select modulation types and encoding rate the two one of at least;
Transmit message by radio-frequency channel, described message comprises a plurality of described modulation types and described encoding rate;
According to described modulation type and described encoding rate the two one of at least, the configuration receiver is to receive data subsequently; Wherein, receive the feedback information of the geometric average signal to noise ratio (snr) that comprises each spatial flow of receiver transmission; Based on SNR feedback information and target Packet Error Ratio, select modulation type for each spatial flow, be based upon the modulation type that each spatial flow is selected, use wave beam forming, send data to receiver;
And, point out whether to use wave beam forming to come to send the described data of receiving subsequently by message; Whether point out when sending described subsequently data that receive by message, to use channel feedback information.
2, method according to claim 1 is characterized in that, described method also comprises by RF channel reception message.
3, method according to claim 1, it is characterized in that, described method also comprises by RF channel reception message, described message is included in the described data of receiving subsequently, comprising having the two explanation one of at least of one described modulation type in a plurality of spatial data of receiving and described encoding rate.
4, method according to claim 3 is characterized in that, the two includes described modulation type and described encoding rate one of at least to one in the described a plurality of spatial flows that will launch and to one explanation corresponding in a plurality of spatial flows that receive.
5, a kind of method that transmits information in MIMO communication system comprises:
Receive message by the RF channel, comprising having to a plurality of modulation types of a plurality of spatial flows that will launch and the explanation of encoding rate;
The two is configured reflector one of at least based on described modulation type and described encoding rate, with emission data subsequently;
Wherein, the feedback information of the geometric average signal to noise ratio (snr) that comprises each spatial flow of transmitter receipt receiver transmission; Based on SNR feedback information and target Packet Error Ratio, select modulation type for each spatial flow, be based upon the modulation type that each spatial flow is selected, use wave beam forming, send data to receiver;
And, point out whether to use wave beam forming to come to send the described data of receiving subsequently by message; Whether point out when sending described subsequently data that receive by message, to use channel feedback information.
6, method according to claim 5 is characterized in that, described method also comprises by described RF channel transmission message.
7, a kind of system that transmits information in MIMO communication system comprises:
Receiver, for a plurality of spatial flows that will launch select modulation types and encoding rate the two one of at least;
Described receiver transmits information by radio-frequency channel, and described information comprises a plurality of described modulation types and described encoding rate;
The two is configured to receive data subsequently one of at least described receiver based on described modulation type and described encoding rate;
Wherein, the feedback information of the geometric average signal to noise ratio (snr) that comprises each spatial flow of transmitter receipt receiver transmission; Based on SNR feedback information and target Packet Error Ratio, select modulation type for each spatial flow, be based upon the modulation type that each spatial flow is selected, use wave beam forming, send data to receiver;
And, point out whether to use wave beam forming to come to send the described data of receiving subsequently by message; Whether point out when sending described subsequently data that receive by message, to use channel feedback information.
8, system according to claim 7 is characterized in that, described receiver receives message by the RF channel.
9, a kind of system that transmits information in MIMO communication system comprises:
Reflector receives message by the RF channel, and described message comprises a plurality of modulation types of a plurality of spatial flows that will launch and the explanation of encoding rate;
The two is configured to send data subsequently one of at least described reflector based on described modulation type and described encoding rate;
Wherein, the feedback information of the geometric average signal to noise ratio (snr) that comprises each spatial flow of transmitter receipt receiver transmission; Based on SNR feedback information and target Packet Error Ratio, select modulation type for each spatial flow, be based upon the modulation type that each spatial flow is selected, use wave beam forming, send data to receiver;
And, point out whether to use wave beam forming to come to send the described data of receiving subsequently by message; Whether point out when sending described subsequently data that receive by message, to use channel feedback information.
10, system according to claim 9 is characterized in that, described reflector sends message by described RF channel.
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| CN104702302A (en) * | 2013-12-04 | 2015-06-10 | 中国科学院上海高等研究院 | Intelligent antenna device and signal processing method based on IEEE802.11g protocol |
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