CN104363192A - Receiving method and device of MIMO (multiple-input multiple-output) communication system compatible to multiple frame formats - Google Patents

Receiving method and device of MIMO (multiple-input multiple-output) communication system compatible to multiple frame formats Download PDF

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CN104363192A
CN104363192A CN201410564348.3A CN201410564348A CN104363192A CN 104363192 A CN104363192 A CN 104363192A CN 201410564348 A CN201410564348 A CN 201410564348A CN 104363192 A CN104363192 A CN 104363192A
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sig
ppdu
mimo
field
ofdm
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CN104363192B (en
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何世文
吴波
王海明
黄永明
张军
洪伟
江华
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Nanjing etaco Communication Technology Co.,Ltd.
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In Jiangsu Emerging Micro-Communication Ceases Science And Technology Ltd
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Abstract

The invention discloses a receiving method and device of an MIMO (multiple-input multiple-output) communication system compatible to multiple frame formats and belongs to the technical field of wireless communication. In a millimeter-wave wireless communication system, stations working in the same basic service set are likely to receive three different types of PPDUs (physical layer protocol data units), namely a single-carrier MIMO PPDU, an OFDM (orthogonal frequency division multiplexing) MIMO PPDU and an OFDM MU-MIMO (multi-user multiple-input multiple-output) PPDU. Preambles of the three frame formats are identical to signaling fields A in format and sent in a single-carrier mode. The receiving method includes that a receiver demodulates the signaling fields A with the single-carrier mode, a receiving process is configured on the basis of the signaling fields A and signaling fields B, and the various PPDUs are demodulated. Compared with the prior art, the receiving method and device have the advantage that reliability and compatibility of the system are improved effectively.

Description

The method of reseptance of the MIMO communication system of the multiple frame format of a kind of compatibility and device
Technical field
The present invention relates to method for processing received signal and device that one is applied to WLAN (wireless local area network) multiple-input and multiple-output (MIMO:Multiple-Input Multiple-Output) mixed carrier mechanism communication system, multiple physical layers protocol Data Unit (PPDU:Physical Layer Protocol Data Unit) can be processed, receiver configures based on signaling field A and signaling field B and receives flow process, the reliability of effective raising system and compatibility, belong to wireless communication technology field.
Background technology
Due to the growing tension of radio spectrum resources, millimetre-wave attenuator technology is paid close attention to widely, becomes one of the most promising communication technology.The millimetre-wave attenuator technology of high-throughput becomes one of field that wireless communication technology enlivens the most.At millimeter wave frequency band, in the urgent need to reducing the peak-to-average force ratio of baseband signal, to alleviate the design difficulty of power amplifier.Relative to OFDM (OFDM:Orthogonal Frequency Division Multiplexing) system, while single-carrier modulated mode has low peak average ratio advantage, still there is the Receiver Complexity similar to OFDM and communication system performance.Therefore, single-carrier system is widely adopted in millimetre-wave attenuator.But the complexity that single-carrier system realizes precoding and multi-user is higher, ofdm system then can carry out Precoding Design with lower complexity, and carries out pre-encode operation to transmission data, and then strengthens reliability and the throughput of system.Therefore, single-carrier modulated and OFDM modulation conbined usage are one of technology of the key of millimetre-wave attenuator.
IEEE 802.11ad and IEEE 802.11aj two kinds of WLAN standard support carrier way to send all simultaneously and OFDM mode sends.IEEE 802.11ad standard uses directional antenna to send data, can only support a data flow.IEEE 802.11aj standard supports multiple-input and multiple-output (MIMO:Multiple-Input Multiple-Output) technology and multi-user's multiple-input and multiple-output (MU-MIMO:Multi-User Multiple-Input Multiple-Output) technology.In order to support to receive SC MIMO PPDU, the PPDU that OFDM MIMO PPDU and OFDM MU-MIMO PPDU tri-kinds is dissimilar, IEEE 802.11aj standard provides three kinds of different frame formats.
Based on above-mentioned discovery, a receiver realizing IEEE 802.11aj standard should possess the processing module receiving above-mentioned three kinds of frames.The invention provides a kind of receiver processing method and the device that are applied to MIMO communication system, multiple physical layers protocol Data Unit can be processed, receiver configures based on signaling field A and signaling field B and receives flow process, the reliability of effective raising system and compatibility.
Summary of the invention
Goal of the invention: the object of the invention is receiver processing method and the device of the MIMO communication system providing the multiple PPDU frame format of a kind of compatibility, receiver configures based on signaling field A and receives flow process, effectively raises reliability and the compatibility of system.
Technical scheme: technical scheme for a better understanding of the present invention, to the inventive method based on PPDU frame format and send mode be described below:
The PPDU frame structure of the MIMO communication system of process of the present invention comprises: single carrier (SC:Single Carrier) MIMO PPDU frame structure, and it comprises single carrier lead code (SC synchronously trains field and SC channel estimating training field), SC signaling field A (SIG-A) and SC data field; OFDM MIMO PPDU frame structure, it comprises SC lead code, SC SIG-A, multicarrier training field and OFDM data field; OFDM MU-MIMO PPDU frame structure, it comprises SC lead code, SIG-A, multicarrier training field, signaling field B (SIG-B) and OFDM data field.
In order to compatible two kinds of carrier wave mechanism, the lead code in above-mentioned three kinds of structures, SIG-A all send in SC mode, and data field then can send with different carrier systems, as SC mode or OFDM mode.The send mode of these PPDU is briefly described below: (1) SC MIMO PPDU: lead code, SIG-A and data field all adopt SC mode to send, concrete operations mode can referenced patent application number be 201410431695.9 patent; (2) OFDM MIMO PPDU and OFDM MU-MIMO PPDU is then that mixed carrier mode sends, the visible number of patent application of its detailed send mode is the patent of 201410431695.9, simplified summary is described below: 1) lead code of OFDM MIMO PPDU and OFDM MU-MIMO PPDU and SIG-A are that SC mode sends, and rises after sampling the sample rate of OFDM and sends; 2) the multicarrier training field of OFDM MIMO PPDU and OFDM MU-MIMO PPDU and the SIG-B of data field and OFDM MU-MIMO adopt OFDM mode to send.
In order to realize foregoing invention object, the present invention adopts following technical scheme:
A method of reseptance for the MIMO communication system of compatible SC MIMO, OFDM MIMO and OFDM MU-MIMO tri-kinds of frame formats, comprises the steps:
(1) website operated under certain Basic Service Set, when not accessing channel, is placed in accepting state by radio frequency link, and duplicate detection frame, until the arrival of a frame detected, enters step (2);
(2) receiver uses lead code to complete the estimation of carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients;
(3) after process being received to SIG-A based on the time domain channel coefficients obtained in step (2), cyclic redundancy check (CRC) (CRC:Cyclic Redundancy Check) is done to SIG-A, if check unsuccessfully, then return step (1), if verification succeeds, then enter step (4);
(4) information of each son field in SIG-A is resolved, the frame format type drawing PPDU is judged according to the SC/OFDM son field in SIG-A and GroupID son field, the relevant parameter needed for demodulation PPDU is calculated for concrete frame format type, if the Modulation and Coding Scheme that receiver does not support SIG-A to indicate (MCS:modulation and coding scheme), after then waiting for certain time length, return step (1), otherwise, enter step (5);
Above-mentioned relevant parameter is specially:
1) if PPDU is SC MIMO PPDU, parameter comprises the code word number N of data field cWwith SC symbolic blocks number N bLK;
N cWcomputing formula as follows:
(formula 1)
In formula 1, Length is the son field that SIG-A represents this PPDU data load, and unit is byte, L cWcode length and the code check of low-density parity test code (LDPC:Low Density Parity Check) code word is represented respectively with R;
N bLKcomputing formula as follows:
(formula 2)
In formula 2, N cBPBbe the number of coded bits of each symbolic blocks of data field, the coded modulation scheme that value is indicated by SIG-A and spatial flow number determine jointly, when this PPDU is non-STBC transmission, and m sTBC=1, when this PPDU be STBC mode send time, m sTBC=2, when this PPDU be as the criterion orthogonal STBC mode send time, m sTBC=4.
2) if PPDU is OFDM MIMO PPDU, parameter comprises the OFDM symbol number N of data field sym;
N symcomputing formula as follows:
(formula 3)
In formula 3, N cBPSrepresent number of coded bits in each OFDM symbol, N cBPSvalue depends on the coded modulation scheme that SIG-A indicates and spatial flow number, and lcm{} represents and gets least common multiple, and the instruction according to the NSTS/PAID son field of SIG-A obtains spatial stream number N sTS.
3) if PPDU is OFDM MU-MIMO PPDU, parameter is fluxion and corresponding position when to comprise corresponding to this website empty; Computational methods for: first determine the user index number corresponding to this website according to the value of the son field GroupID in SIG-A, fluxion N when then to determine corresponding to this website empty according to NSTS/PAID sTS, uand corresponding position, u represents user index number and value is an integer between 0 ~ 3.As u=0, the 1st to N sTS, 0individual empty time stream for being sent to user 0 empty time stream, when u ≠ 0, the individual to individual empty time stream stream when to be user u empty, wherein, N sTS, iflow amount during user i corresponding empty for the instruction of MU in SIG-A [i] NSTS son field.
(5) judge that whether this PPDU is relevant with this website according to the information of the son field in SIG-A, if this PPDU and this website have nothing to do, then receiver does not process this PPDU, wait for certain time length, return step (1), otherwise, enter step (6); Concrete determination methods is: if meet any one condition following, then represent that this PPDU and this website have nothing to do, otherwise relevant with this website:
1) (SC MIMO PPDU and OFDM MIMO PPDU is comprised) as GroupID=0 or 63, recipient's non-website of PAID son field instruction in SIG-A;
2) when the assignment of GroupID is certain number between 1 ~ 62, this website does not belong to the Website Hosting corresponding to packet number of GroupID son field instruction in SIG-A;
3) when the assignment of GroupID is certain number between 1 ~ 62, this website belongs to the Website Hosting corresponding to packet number of GroupID son field instruction in SIG-A, but the value of MU [u] NSTS son field is 0 in SIG-A, namely the data of this website are not comprised in the PPDU sent, the user index number of u corresponding to this website.
(6) according to PPDU frame format type determination demodulation mode, if this PPDU is SC MIMO PPDU, then step (7) is performed, if this PPDU is OFDM MIMO PPDU, then perform step (8), otherwise, perform step (9);
(7) with the further part of this PPDU of mode demodulation of SC MIMO;
(8) with the further part of this PPDU of mode demodulation of OFDM SU MIMO;
(9) with the further part of this PPDU of mode demodulation of OFDM MU-MIMO.
The concrete steps of described step (7) comprising:
(7.1) if the power of data field signal is lower than the treatable threshold value of receiver, wait for certain time length, return step (1), otherwise, receive and treatment S C symbolic blocks, its process comprises protects interval, equilibrium, solution constellation mapping to conciliate stream and resolve;
(7.2) N bLK:=N bLK-1, by N bLKvalue subtract 1 and be assigned to N bLKif, N bLKvalue be greater than 1, then return step (7.1), otherwise, enter step (7.3);
(7.3) N is retained according to the result of calculation of step (4) cW× L cWthe data of individual bit, after ldpc decoder decoding and descrambling, remove the zero padding bit of code word zero padding, namely to fetch data the data of Length byte before stream according to the instruction of the Length son field of SIG-A, obtain the data sent, terminate the receiving course of PPDU, accepting state is arranged to do not have mistake, then wait for certain time length, return step (1).
The concrete steps of described step (8) comprising:
(8.1) utilize multicarrier to train field to estimate MIMO-OFDM equivalent channel matrix, obtain the channel matrix on each subcarrier respectively, the equivalent channel matrix H on subcarrier k ksize be N rXrow N sTSrow, N rXrepresent the reception antenna number of this website;
(8.2) if the power of data field signal is lower than the treatable threshold value of receiver, wait for certain time length, return step (1), otherwise, based on step (8.1) gained equivalent channel matrix receive OFDM symbol, its process comprise protection interval, equilibrium, solution LDPC subcarrier map, separate constellation mapping conciliate stream resolve and by separate stream parse operation after data stored in buffering area;
(8.3) N sym:=N sym-1, by N symvalue subtract 1 and be assigned to N symif, N sym=0, then enter step (8.4), otherwise, return step (8.2);
(8.4) to the sequence LDPC decoding of step (8.2) gained, after descrambling operation, go zero padding namely to fetch data the data of Length byte before stream according to the instruction of the Length son field of SIG-A, obtain transmission data, wait for certain time length, return step (1).
The concrete steps of described step (9) comprising:
(9.1) during this website obtained based on step (4) empty stream position and empty time flow amount, multicarrier is utilized to train field to estimate MIMO-OFDM equivalent channel matrix, obtain the channel matrix on each subcarrier respectively, the equivalent channel matrix H on subcarrier k ksize be N rXrow N sTS, urow;
(9.2) based on step (9.1), receiver estimates that the equivalent channel matrix obtained receives and demodulation SIG-B, is CRC to SIG-B, if CRC check failure, then wait for certain time length, return step (1), otherwise, enter step (9.3);
(9.3) if receiver can treatment S IG-B instruction MCS, then enter step (9.4), otherwise, wait for certain time length, return step (1);
(9.4) configuration receives relevant parameter to this PPDU, comprises the data field OFDM symbol number N that length (data field byte number) and receiver need demodulation sym, N symcomputational methods as follows:
(formula 4)
In formula 4, N cBPS, uvalue by MU MCS son field in the SIG-B of u user and SIG-A MU [u] NSTS son field determine, Length uvalue equal the value of Length field in the SIG-B of u user;
(9.5) if the power of data field signal is lower than the treatable threshold value of receiver, wait for certain time length, return step (1), otherwise, equivalent channel matrix based on step (9.1) gained receives an OFDM symbol, and its process comprises protects interval, equilibrium, solution LDPC subcarrier to map, separate constellation mapping reconciliation stream parsing and will separate the data of stream parsing stored in buffering area;
(9.6) N sym:=N sym-1, by N symvalue subtract 1 and be assigned to N symif, N sym=0, then enter step (9.7), otherwise, return step (9.5);
(9.7) instruction of the Length son field of the SIG-B received according to this website goes zero padding namely to fetch data Length before stream uthe data of individual byte, obtain sending data, wait for certain time length, return step (1).
Adopt a receiving system for the MIMO communication system of the multiple frame format of the compatibility of as above method, comprising: frame detection module, lead code processing module, SIG-A processing module, SIG-A field parsing module, website judge module, demodulation select module, SC MIMO demodulation module, OFDM SU MIMO demodulation module and OFDM MU-MIMO demodulation module; Wherein,
Frame detection module, for website when not accessing channel, is placed in accepting state by radio frequency link, and duplicate detection frame, until the arrival of a frame detected, exports frame data to lead code processing module;
Lead code processing module, for the frame data that received frame detection module exports, uses lead code to complete carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients and estimates;
SIG-A processing module, for receiving process according to time domain channel coefficients to SIG-A, and does cyclic redundancy check (CRC) to SIG-A;
SIG-A field parsing module, for resolving the information of each son field in SIG-A, and calculates the relevant parameter needed for demodulation PPDU;
Website judge module, the sub-domain information for obtaining according to SIG-A field parsing module judges that whether the PPDU received is relevant with this website;
Module is selected in demodulation, for selecting the mode of concrete demodulation PPDU according to frame format type;
SC MIMO demodulation module, for the relevant parameter that obtains according to SIG-A field parsing module with the SC data field of the mode demodulation PPDU of SC MIMO;
OFDM SU MIMO demodulation module, trains field and OFDM data field for the relevant parameter obtained according to SIG-A field parsing module with the multicarrier of the mode demodulation PPDU of OFDM SU MIMO;
And,
OFDM MU-MIMO demodulation module, trains field, SIG-B and OFDM data field for the relevant parameter obtained according to SIG-A field parsing module with the multicarrier of this PPDU of mode demodulation of OFDM MU-MIMO.
Accompanying drawing explanation
Fig. 1 is the overview flow chart of the embodiment of the present invention;
Fig. 2 is the schematic diagram of the SIG-A part field of the embodiment of the present invention;
Fig. 3 is the schematic diagram of the SIG-B part field of the embodiment of the present invention.
Embodiment
Technology of the present invention may be used for various system of broadband wireless communication, and the radio node of realization can comprise access point or access terminal, and the example of this communication system comprises millimeter wave wireless MIMO communication systems etc.
Below for millimeter wave WLAN (wireless local area network) (IEEE 802.11aj) 540MHz bandwidth, be described in further detail the method for reseptance of MIMO communication system of the multiple frame format of a kind of compatibility of the present invention and the embodiment of device by reference to the accompanying drawings, wherein frame format comprises following three types:
SC MIMO frame structure, i.e. SC lead code (referred to as SC Preamble), the structure of SC SIG-A and SC data field, it can comprise SC and synchronously train field (referred to as SC STF), SC channel estimating training field (referred to as SC CTF), SC SIG-A, SC data field.
Single User MIMO frame structure, i.e. SC lead code (referred to as SC Preamble), the structure of SC SIG-A and OFDM field, it can comprise SC and synchronously train field (referred to as SC STF), SC channel estimating training field (referred to as SC CTF), SC SIG-A, OFDM long training field (referred to as OFDM-LTF) and OFDM data field.
Multiuser MIMO frame structure, i.e. SC lead code (referred to as SC Preamble), the structure of SC SIG-A and OFDM field, it can comprise SC and synchronously train field (referred to as SC STF), SC channel estimating training field (referred to as SC CTF), SC SIG-A, OFDM long training field (referred to as OFDM-LTF), SIG-B and data field.
In millimeter wave WLAN (wireless local area network) (IEEE 802.11aj) standard, define the parameter that system is relevant, as shown in table 1, directly use these parameters in discussion below.
Table 1 millimeter wave WLAN (wireless local area network) relevant parameter
In the embodiment of the present invention, receiver is configured with 2 antennas, and the MCS value that SC MIMO PPDU adopts is 3, namely modulation system is pi/2-16-QAM, code check be 1/2 mode send, single PSDU length is 4000 bytes, the spatial data fluxion adopted is 2, sends in the mode of non-STBC; The MCS value that OFDM MIMO PPDU adopts is 3, and namely modulation system is 16-QAM, and code check is 1/2, and single PSDU length is 4000 bytes, and the spatial data fluxion of employing is 2, sends in the mode of non-STBC; In the embodiment of OFDM MU-MIMO PPDU, PSDU length is respectively 4000 bytes and 6000 bytes, and the spatial data fluxion of employing is respectively 2 and 1, receiver is the 0th user of this PPDU, the MCS value of the 0th user is 3, and namely modulation system is 16-QAM, and code check is 1/2.The present embodiment illustrates the processing procedure of receiver.Support that the example that the scene of different bandwidth, different spaces data fluxion and different modulating mode can be revised in the present embodiment obtains.
Fig. 1 is the overview flow chart of the method for reseptance of the MIMO communication system of the multiple frame format of compatibility of the embodiment of the present invention, below respectively to receive the concrete operation step that a SC MIMO PPDU, OFDM MIMO PPDU and OFDM MU-MIMO PPDU tri-examples describe the inventive method embodiment in detail.
Example 1: receive a SC MIMO PPDU
(A1) one operates in the website under certain Basic Service Set, and when not accessing channel, radio frequency link is placed in accepting state, duplicate detection frame, until the arrival of a frame detected, enters step (A2);
(A2) receiver uses lead code to complete the estimation of carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients;
(A3) after process being received to SIG-A based on the time domain channel coefficients obtained in step (A2), the concrete structure of SIG-A is shown in Fig. 2, cyclic redundancy check (CRC) is done to SIG-A, if check unsuccessfully, then return step (A1), if verification succeeds, then enter step (A4);
(A4) resolve the information of each son field in SIG-A, due in this example, the PPDU received is SC MIMO PPDU, so the value of SC/OFDM son field is 0 in SIG-A, calculates the relevant parameter needed for this PPDU of demodulation, the code word number N of data field cWwith SC symbolic blocks number N bLK, calculation procedure is as follows:
1) the code word number N of calculated data field cW:
L is known by parameter configuration in embodiment cW=672, indicated by son field Length in SIG-A and know Length=4000, know that the modulation system of this PPDU is pi/2-16-QAM by the instruction of son field SU MCS in SIG-A, code check is 1/2, calculates according to formula 1:
(formula 5)
2) calculated data field symbols block number N bLK:
M is known by parameter configuration in embodiment sTBC=1, N cBPB=2048, calculate according to formula 2:
(formula 6)
If the MCS that SIG-A indicates do not supported by receiver, then, after waiting for certain time length, return step (A1), otherwise, enter step (A5);
(A5) receiver is according to the instruction of son field NSTS/PAID in SIG-A, judge whether this PPDU is with relevant with this website, if recipient's non-website of PAID son field instruction in SIG-A, represent that this PPDU and this website have nothing to do, then receiver does not process this PPDU, waits for certain time length, returns step (A1), otherwise, enter step (A6);
(A6) if the power of data field signal is lower than the treatable threshold value of receiver, wait for certain time length, return step (A1), otherwise, receive and treatment S C symbolic blocks, its process comprises protects interval, equilibrium, solution constellation mapping to conciliate stream and resolve;
(A7) N bLK:=N bLK-1, by N bLKvalue subtract 1 and be assigned to N bLKif, N bLKvalue be greater than 1, then return step (A6), otherwise, enter step (A8);
(A8) data of 64512 bits are retained according to the result of calculation of step (A4), after ldpc decoder decoding and descrambling, remove the zero padding bit of code word zero padding, namely to fetch data the data of Length byte before stream according to the instruction of the Length son field of SIG-A, obtain the data sent, terminate the receiving course of PPDU, accepting state is arranged to do not have mistake, then wait for certain time length, return step (A1).
Example 2: receive an OFDM MIMO PPDU
(B1) one operates in the website under certain Basic Service Set, and when not accessing channel, radio frequency link is placed in accepting state, duplicate detection frame, until the arrival of a frame detected, enters step (B2);
(B2) receiver uses lead code to complete the estimation of carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients;
(B3) after process being received to SIG-A based on the time domain channel coefficients obtained in step (B2), cyclic redundancy check (CRC) is done to SIG-A, if check unsuccessfully, then returns step (B1), if verification succeeds, then enter step (B4);
(B4) resolve the information of each son field in SIG-A, calculate the relevant parameter needed for this PPDU of demodulation, the OFDM symbol number N of data field symcomputational process as follows:
L is known by the parameter configuration in embodiment cW=672, indicated by son field Length in SIG-A and know Length=4000, know that the modulation system of this PPDU is 16-QAM by the instruction of son field SU MCS in SIG-A, code check is 1/2, knows N by the instruction of son field SU NSTS in SIG-A sTS=2, so N cBPS=1344, calculate according to formula 3:
(formula 7)
If the MCS that SIG-A indicates do not supported by receiver, then, after waiting for certain time length, return step (B1), otherwise, enter step (B5);
(B5) receiver is according to the instruction of son field NSTS/PAID in SIG-A, judge whether this PPDU is with relevant with this website, if recipient's non-website of PAID son field instruction in SIG-A, represent that this PPDU and this website have nothing to do, then receiver does not process this PPDU, waits for certain time length, returns step (B1), otherwise, enter step (B6);
(B6) utilize multicarrier to train field to estimate MIMO-OFDM equivalent channel matrix, obtain the channel matrix on each subcarrier respectively, the equivalent channel matrix H on subcarrier k ksize be that 2 row 2 arrange;
(B7) if the power of data field signal is lower than the treatable threshold value of receiver, wait for certain time length, return step (B1), otherwise, based on step (B6) gained equivalent channel matrix receive OFDM symbol, its process comprise protection interval, equilibrium, solution LDPC subcarrier map, separate constellation mapping conciliate stream resolve and by separate stream parse operation after data stored in buffering area;
(B8) N sym:=N sym-1, by N symvalue subtract 1 and be assigned to N symif, N sym=0, then enter step (B9), otherwise, return step (B7);
(B9) to the sequence LDPC decoding of step (B7) gained, after descrambling operation, go zero padding namely to fetch data the data of front 4000 bytes of stream according to the instruction of the Length son field of SIG-A, obtain sending data, wait for certain time length, return step (B1).
Example 3: receive an OFDM MU-MIMO PPDU
(C1) one operates in the website under certain Basic Service Set, and when not accessing channel, radio frequency link is placed in accepting state, duplicate detection frame, until the arrival of a frame detected, enters step (C2);
(C2) receiver uses lead code to complete the estimation of carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients;
(C3) after process being received to SIG-A based on the time domain channel coefficients obtained in step (C2), cyclic redundancy check (CRC) is done to SIG-A, if check unsuccessfully, then returns step (C1), if verification succeeds, then enter step (C4);
(C4) information of each son field in SIG-A is resolved, the son field SC/OFDM=1 of SIG-A in this example and the assignment of son field GroupID are certain number between 1 ~ 62, determine that this website is the 0th user of OFDM MU-MIMO PPDU according to the value of the son field GroupID in SIG-A, then when according to NSTS/PAID, to determine corresponding to this website empty, fluxion is 2,1 is flowed to stream 2 time empty when position is sky, if the MCS that SIG-A indicates do not supported by receiver, after then waiting for certain time length, return step (C1), otherwise, enter step (C5);
(C5) receiver is according to the instruction of the son field GroupID in SIG-A and son field NSTS/PAID two son fields, judges whether this PPDU is with relevant with this website, meets any one condition following:
1) this website does not belong to the Website Hosting corresponding to packet number of GroupID son field instruction in SIG-A;
2) if this website belongs to the Website Hosting corresponding to packet number of GroupID son field instruction in SIG-A, but in SIG-A, the value of MU [0] NSTS son field is 0, does not comprise the data of this website in the PPDU namely sent.
Represent that this PPDU and this website have nothing to do, then receiver does not process this PPDU, waits for certain time length, returns step (C1), otherwise, enter step (C6), do not meet above-mentioned condition in this example and namely enter step (C6);
(C6) during this website obtained based on step (C4) empty stream position and empty time flow amount, multicarrier is utilized to train field to estimate MIMO-OFDM equivalent channel matrix, obtain the channel matrix on each subcarrier respectively, the equivalent channel matrix H on subcarrier k ksize be that 2 row 2 arrange;
(C7) based on step (C6), receiver estimates that the equivalent channel matrix obtained receives and demodulation SIG-B, the concrete structure of SIG-B is shown in Fig. 3, CRC is done to SIG-B, if CRC check failure, then wait for certain time length, return step (C1), otherwise, enter step (C8);
(C8) if receiver can treatment S IG-B instruction MCS, then enter step (C9), otherwise, wait for certain time length, return step (C1);
(C9) configuration receives relevant parameter to this PPDU, comprises the data field OFDM symbol number N that length (data field byte number) and receiver need demodulation sym, N symcomputational methods as follows:
L is known by the parameter configuration in embodiment cW=672, indicated by son field Length in SIG-B and know Length 0=4000, know that the modulation system of this PPDU is 16-QAM by the instruction of son field MCS in SIG-B, code check is 1/2, knows N by the instruction of son field MU in SIG-A [0] NSTS sTS=2, so N cBPS, 0=1344, calculate according to formula 4:
(formula 8)
(C10) if the power of data field signal is lower than the treatable threshold value of receiver, wait for certain time length, return step (C1), otherwise, equivalent channel matrix based on step (C6) gained receives an OFDM symbol, and its process comprises protects interval, equilibrium, solution LDPC subcarrier to map, separate constellation mapping reconciliation stream parsing and will separate the data of stream parsing stored in buffering area;
(C11) N sym:=N sym-1, by N symvalue subtract 1 and be assigned to N symif, N sym=0, then enter step (C12), otherwise, return step (C10);
(C12) instruction of the Length son field of the SIG-B received according to this website goes zero padding namely to fetch data the data of front 4000 bytes of stream, obtains sending data, waits for certain time length, return step (C1).
The embodiment of the present invention additionally provides a kind of receiving system adopting the MIMO communication system of the multiple frame format of the compatibility of as above method, comprising: frame detection module, lead code processing module, SIG-A processing module, SIG-A field parsing module, website judge module, demodulation select module, SC MIMO demodulation module, OFDM SU MIMO demodulation module and OFDM MU-MIMO demodulation module; Wherein,
Frame detection module, for website when not accessing channel, is placed in accepting state by radio frequency link, and duplicate detection frame, until the arrival of a frame detected, exports frame data to lead code processing module;
Lead code processing module, for the frame data that received frame detection module exports, uses lead code to complete carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients and estimates;
SIG-A processing module, for receiving process according to time domain channel coefficients to SIG-A, and does cyclic redundancy check (CRC) to SIG-A;
SIG-A field parsing module, for resolving the information of each son field in SIG-A, and calculates the relevant parameter needed for demodulation PPDU;
Website judge module, the sub-domain information for obtaining according to SIG-A field parsing module judges that whether the PPDU received is relevant with this website;
Module is selected in demodulation, for selecting the mode of concrete demodulation PPDU according to frame format type;
SC MIMO demodulation module, for the relevant parameter that obtains according to SIG-A field parsing module with the SC data field of the mode demodulation PPDU of SC MIMO;
OFDM SU MIMO demodulation module, trains field and OFDM data field for the relevant parameter obtained according to SIG-A field parsing module with the multicarrier of the mode demodulation PPDU of OFDM SU MIMO;
And,
OFDM MU-MIMO demodulation module, trains field, SIG-B and OFDM data field for the relevant parameter obtained according to SIG-A field parsing module with the multicarrier of this PPDU of mode demodulation of OFDM MU-MIMO.

Claims (9)

1. a method of reseptance for multiple-input and multiple-output (MIMO) communication system of the multiple frame format of compatibility, the frame structure of the physical layer protocol data unit (PPDU) of described MIMO communication system comprises:
Single carrier (SC) MIMO PPDU frame structure, comprises SC lead code, SC signaling field A (SIG-A) and SC data field;
OFDM (OFDM) MIMO PPDU frame structure, comprises SC lead code, SC SIG-A, multicarrier training field and OFDM data field; And,
OFDM MU-MIMO PPDU frame structure, comprises SC lead code, SC SIG-A, multicarrier training field, signaling field B (SIG-B) and OFDM data field;
It is characterized in that, described method of reseptance comprises the steps:
(1) website operated under certain Basic Service Set, when not accessing channel, is placed in accepting state by radio frequency link, and duplicate detection frame, until the arrival of a frame detected, enters step (2);
(2) receiver uses lead code to complete the estimation of carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients;
(3) after process being received to SIG-A based on the time domain channel coefficients obtained in step (2), cyclic redundancy check (CRC) (CRC) is done to SIG-A, if check unsuccessfully, then returns step (1), if verification succeeds, then enter step (4);
(4) information of each son field in SIG-A is resolved, the frame format type drawing PPDU is judged according to the SC/OFDM son field in SIG-A and GroupID son field, the relevant parameter needed for demodulation PPDU is calculated for concrete frame format type, if the Modulation and Coding Scheme (MCS) that receiver does not support SIG-A to indicate, after then waiting for certain time length, return step (1), otherwise, enter step (5);
Described relevant parameter is specially:
If PPDU is SC MIMO PPDU, comprise the code word number N of data field cWwith SC symbolic blocks number N bLK;
If PPDU is OFDM MIMO PPDU, comprise the OFDM symbol number N of data field sym;
If PPDU is OFDM MU-MIMO PPDU, fluxion and corresponding position when to comprise corresponding to this website empty;
(5) judge that whether this PPDU is relevant with this website according to the information of the son field in SIG-A, if this PPDU and this website have nothing to do, then receiver does not process this PPDU, wait for certain time length, return step (1), otherwise, enter step (6);
(6) according to PPDU frame format type determination demodulation mode, if this PPDU is SC MIMO PPDU, then step (7) is performed, if this PPDU is OFDM MIMO PPDU, then perform step (8), otherwise, perform step (9);
(7) with the further part of this PPDU of mode demodulation of SC MIMO;
(8) with the further part of this PPDU of mode demodulation of OFDM SU MIMO;
(9) with the further part of this PPDU of mode demodulation of OFDM MU-MIMO.
2. the method for reseptance of the MIMO communication system of the multiple frame format of compatibility according to claim 1, is characterized in that:
The code word number N of described data field cWcomputing formula be:
In formula 1, Length is the son field that SIG-A represents this PPDU data load, and unit is byte, L cWcode length and the code check of low-density parity test code code word is represented respectively with R;
Described SC symbolic blocks number N bLKcomputing formula be:
In formula 2, N cBPBbe the number of coded bits of each symbolic blocks of data field, the coded modulation scheme that value is indicated by SIG-A and spatial flow number determine jointly, when this PPDU is non-STBC transmission, and m sTBC=1, when this PPDU be STBC mode send time, m sTBC=2, when this PPDU be as the criterion orthogonal STBC mode send time, m sTBC=4.
3. the method for reseptance of the MIMO communication system of the multiple frame format of compatibility according to claim 1, is characterized in that:
The OFDM symbol number N of described data field symcomputing formula be:
In formula 3, N cBPSrepresent number of coded bits in each OFDM symbol, N cBPSvalue depends on the coded modulation scheme that SIG-A indicates and spatial flow number, and lcm{} represents and gets least common multiple, and the instruction according to the NSTS/PAID son field of SIG-A obtains spatial stream number N sTS, L cWcode length and the code check of low-density parity test code code word is represented respectively with R, when this PPDU is non-STBC transmission, m sTBC=1, when this PPDU be STBC mode send time, m sTBC=2, when this PPDU be as the criterion orthogonal STBC mode send time, m sTBC=4.
4. the method for reseptance of the MIMO communication system of the multiple frame format of compatibility according to claim 1, is characterized in that:
During empty corresponding to described website fluxion and corresponding position computational methods for: first determine the user index number corresponding to this website according to the value of the son field GroupID in SIG-A, fluxion N when then to determine corresponding to this website empty according to NSTS/PAID sTS, uand corresponding position, u represents user index number; As u=0, the 1st to N sTS, 0individual empty time stream for being sent to user 0 empty time stream, when u ≠ 0, the individual to individual empty time stream stream when to be user u empty, wherein, N sTS, iflow amount during user i corresponding empty for the instruction of MU in SIG-A [i] NSTS son field.
5. the method for reseptance of the MIMO communication system of the multiple frame format of compatibility according to claim 1, it is characterized in that, judge that whether relevant with this website concrete determination methods of this PPDU is according to the information of the son field in SIG-A in described step (5): if meet any one condition following, then represent that this PPDU and this website have nothing to do, otherwise relevant with this website:
Receiver, according to the instruction of the son field GroupID in SIG-A and son field NSTS/PAID, judges whether this PPDU is with relevant with this website, meets any one condition following:
As GroupID=0 or 63, recipient's non-website of PAID son field instruction in SIG-A;
When the assignment of GroupID is certain number between 1 ~ 62, this website does not belong to the Website Hosting corresponding to packet number of GroupID son field instruction in SIG-A;
When the assignment of GroupID is certain number between 1 ~ 62, this website belongs to the Website Hosting corresponding to packet number of GroupID son field instruction in SIG-A, but the value of MU [u] NSTS son field is the call number of the user of 0, u corresponding to this website in SIG-A.
6. the method for reseptance of the MIMO communication system of the multiple frame format of compatibility according to claim 1, is characterized in that, the concrete steps of described step (7) comprising:
(7.1) if the power of data field signal is lower than the treatable threshold value of receiver, wait for certain time length, return step (1), otherwise, receive and treatment S C symbolic blocks, its process comprises protects interval, equilibrium, solution constellation mapping to conciliate stream and resolve;
(7.2) by N bLKvalue subtract 1 and be assigned to N bLKif, N bLKvalue be greater than 1, then return step (7.1), otherwise, enter step (7.3);
(7.3) N is retained according to the result of calculation of step (4) cW× L cWthe data of individual bit, after ldpc decoder decoding and descrambling, remove the zero padding bit of code word zero padding, obtain the data sent, terminate the receiving course of PPDU, accepting state is arranged to do not have mistake, then wait for certain time length, return step (1).
7. the method for reseptance of the MIMO communication system of the multiple frame format of compatibility according to claim 1, is characterized in that, the concrete steps of described step (8) comprising:
(8.1) utilize multicarrier to train field to estimate MIMO-OFDM equivalent channel matrix, obtain the channel matrix on each subcarrier respectively, the equivalent channel matrix H on subcarrier k ksize be N rXrow N sTSrow, N rXrepresent the reception antenna number of this website;
(8.2) if the power of data field signal is lower than the treatable threshold value of receiver, wait for certain time length, return step (1), otherwise, based on step (8.1) gained equivalent channel matrix receive OFDM symbol, its process comprise protection interval, equilibrium, solution LDPC subcarrier map, separate constellation mapping conciliate stream resolve and by separate stream parse operation after data stored in buffering area;
(8.3) by N symvalue subtract 1 and be assigned to N symif, N sym=0, then enter step (8.4), otherwise, return step (8.2);
(8.4) to the sequence LDPC decoding of step (8.2) gained, after descrambling operation, zero padding is gone in the instruction according to the Length son field of SIG-A, obtains sending data, waits for certain time length, returns step (1).
8. the method for reseptance of the MIMO communication system of the multiple frame format of compatibility according to claim 1, is characterized in that, the concrete steps of described step (9) comprising:
(9.1) during this website obtained based on step (4) empty stream position and empty time flow amount, multicarrier is utilized to train field to estimate MIMO-OFDM equivalent channel matrix, obtain the channel matrix on each subcarrier respectively, the equivalent channel matrix H on subcarrier k ksize be N rXrow N sTS, urow;
(9.2) based on step (9.1), receiver estimates that the equivalent channel matrix obtained receives and demodulation SIG-B, is CRC to SIG-B, if CRC check failure, then wait for certain time length, return step (1), otherwise, enter step (9.3);
(9.3) if receiver can treatment S IG-B instruction MCS, then enter step (9.4), otherwise, wait for certain time length, return step (1);
(9.4) configuration receives relevant parameter to this PPDU, comprises the data field OFDM symbol number N that data field byte number and receiver need demodulation sym, N symcomputational methods as follows:
In formula 4, N cBPS, uvalue by MU MCS son field in the SIG-B of u user and SIG-A MU [u] NSTS son field determine, Length uvalue equal the value of Length field in the SIG-B of u user;
(9.5) if the power of data field signal is lower than the treatable threshold value of receiver, wait for certain time length, return step (1), otherwise, equivalent channel matrix based on step (9.1) gained receives an OFDM symbol, and its process comprises protects interval, equilibrium, solution LDPC subcarrier to map, separate constellation mapping reconciliation stream parsing and will separate the data of stream parsing stored in buffering area;
(9.6) by N symvalue subtract 1 and be assigned to N symif, N sym=0, then enter step (9.7), otherwise, return step (9.5);
(9.7) zero padding is gone in the instruction of the Length son field of the SIG-B received according to this website, obtains sending data, waits for certain time length, returns step (1).
9. one kind adopts the receiving system of the MIMO communication system of the multiple frame format of compatibility of the method for reseptance of the MIMO communication system of the compatible multiple frame format of any one according to claim 1-8, it is characterized in that, comprising: frame detection module, lead code processing module, SIG-A processing module, SIG-A field parsing module, website judge module, demodulation select module, SC MIMO demodulation module, OFDM SU MIMO demodulation module and OFDM MU-MIMO demodulation module; Wherein,
Frame detection module, for website when not accessing channel, is placed in accepting state by radio frequency link, and duplicate detection frame, until the arrival of a frame detected, exports frame data to lead code processing module;
Lead code processing module, for the frame data that received frame detection module exports, uses lead code to complete carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients and estimates;
SIG-A processing module, for receiving process according to time domain channel coefficients to SIG-A, and does cyclic redundancy check (CRC) to SIG-A;
SIG-A field parsing module, for resolving the information of each son field in SIG-A, and calculates the relevant parameter needed for demodulation PPDU;
Website judge module, the sub-domain information for obtaining according to SIG-A field parsing module judges that whether the PPDU received is relevant with this website;
Module is selected in demodulation, for selecting the mode of concrete demodulation PPDU according to frame format type;
SC MIMO demodulation module, for the relevant parameter that obtains according to SIG-A field parsing module with the SC data field of the mode demodulation PPDU of SC MIMO;
OFDM SU MIMO demodulation module, trains field and OFDM data field for the relevant parameter obtained according to SIG-A field parsing module with the multicarrier of the mode demodulation PPDU of OFDM SU MIMO;
And,
OFDM MU-MIMO demodulation module, trains field, SIG-B and OFDM data field for the relevant parameter obtained according to SIG-A field parsing module with the multicarrier of this PPDU of mode demodulation of OFDM MU-MIMO.
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