CN104363192B - A kind of method of reseptance and device of the MIMO communication system of compatible a variety of frame formats - Google Patents
A kind of method of reseptance and device of the MIMO communication system of compatible a variety of frame formats Download PDFInfo
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Abstract
The present invention discloses a kind of multiple-input and multiple-output of compatible a variety of frame formats（MIMO）The method of reseptance and device of communication system, belong to wireless communication technology field.In Millimeter-wave Wireless Communication System, the website that same basic service is concentrated is operated in, three kinds of different types of physical layer protocol data units are likely to be received（PPDU）, it is single carrier MIMO PPDU, OFDM respectively（OFDM）MIMO PPDU, OFDM multi-user's multiple-input and multiple-output（MU‑MIMO）PPDU.The lead code of above-mentioned three kinds of frame formats is identical with signaling field A forms and is sent using carrier way, and the method for reseptance is：Receiver demodulates signaling field A with carrier way, and receives flow based on signaling field A and signaling field B configurations, demodulates various types of PPDU.Compared with prior art, the method for reseptance and device of the MIMO communication system for compatible a variety of frame formats that the present invention is provided effectively improve the reliability and compatibility of system.
Description
Technical field
WLAN multiple-input and multiple-output (MIMO is applied to the present invention relates to one kind：Multiple-Input
Multiple-Output) method for processing received signal and device of mixed carrier mechanism communication system, can handle a variety of physics
Layer protocol data cell (PPDU:Physical Layer Protocol Data Unit), receiver be based on signaling field A and
Signaling field B configurations receive flow, and the effective reliability and compatibility for improving system belongs to wireless communication technology field.
Background technology
Due to the growing tension of radio spectrum resources, millimetre-wave attenuator technology is widely paid close attention to, as most there is prospect
One of the communication technology.The millimetre-wave attenuator technology of high-throughput turns into one of wireless communication technology the most active field.
Millimeter wave frequency band, the peak-to-average force ratio in the urgent need to reducing baseband signal, to mitigate the design difficulty of power amplifier.Relative to orthogonal
Frequency division multiplexing (OFDM：Orthogonal Frequency Division Multiplexing) system, single-carrier modulated mode
While with low peak average ratio advantage, still with the Receiver Complexity and communication system performance similar to OFDM.Therefore, it is single
Carrier system is widely adopted in millimetre-wave attenuator.But, single-carrier system realizes precoding and the complexity ratio of multi-user
It is higher, and ofdm system can then carry out Precoding Design with relatively low complexity, and pre-encode operation is carried out to sending data, enter
And the reliability and throughput of strengthening system.Therefore, single-carrier modulated and OFDM modulation be used in combination be millimetre-wave attenuator pass
One of technology of key.
Two kinds of WLAN standards of IEEE 802.11ad and IEEE 802.11aj support carrier way hair simultaneously
Send and sent with OFDM modes.IEEE 802.11ad standards send data using directional aerial, can only support a data flow.
IEEE 802.11aj standards support 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.For
Support to receive SC MIMO PPDU, OFDM MIMO PPDU and OFDM MU-MIMO tri- kinds of different types of PPDU of PPDU,
IEEE 802.11aj standards provide three kinds of different frame formats.
Based on above-mentioned discovery, a receiver for realizing IEEE 802.11aj standards, which should possess, receives above-mentioned three kinds of frames
Processing module.The invention provides a kind of receiver processing method and device applied to MIMO communication system, it can handle many
Physical layer protocol data unit is planted, receiver is based on signaling field A and signaling field B configurations and receives flow, effective raising system
The reliability and compatibility of system.
The content of the invention
Goal of the invention：Present invention aims at provide a kind of reception of the MIMO communication system of compatible a variety of PPDU frame formats
Machine treating method and apparatus, receiver is based on signaling field A configurations and receives flow, effectively raises the reliability of system and simultaneous
Capacitive.
Technical scheme：In order to be better understood from technical scheme, to the inventive method based on PPDU frame formats
And sending method is described below：
The PPDU frame structures for the MIMO communication system that the present invention is handled include：Single carrier (SC：Single Carrier)
MIMO PPDU frame structures, it includes single carrier lead code (SC synchronization training fields and SC channel estimations training field), SC signalings
Field A (SIG-A) and SC data fields；OFDM MIMO PPDU frame structures, it includes SC lead codes, SC SIG-A, multicarrier
Training field and OFDM data field；OFDM MU-MIMO PPDU frame structures, it includes SC lead codes, SIG-A, multicarrier instruction
Practise handwriting section, signaling field B (SIG-B) and OFDM data field.
For compatible two kinds of carrier wave mechanism, lead code, SIG-A in above-mentioned three kinds of structures are sent in SC modes, data
Field can then be sent with different carrier systems, such as SC modes or OFDM modes.These PPDU sending method is briefly retouched
State as follows：(1)SC MIMO PPDU：Lead code, SIG-A and data field are all sent using SC modes, and concrete operations mode can
Referenced patent application number is 201410431695.9 patent；(2) OFDM MIMO PPDU and OFDM MU-MIMO PPDU are then
Mixed carrier mode is sent, and its detailed visible number of patent application of sending method is 201410431695.9 patent, simplified summary
It is described as follows:1) OFDM MIMO PPDU and OFDM MU-MIMO PPDU lead code and SIG-A is all that SC modes are sent, and is risen
Sample and sent after OFDM sample rate；2) OFDM MIMO PPDU and OFDM MU-MIMO PPDU multicarrier training field
Sent with data field and OFDM MU-MIMO SIG-B using OFDM modes.
In order to realize foregoing invention purpose, the present invention is adopted the following technical scheme that：
A kind of reception of the MIMO communication system of compatible SC MIMO, OFDM MIMO and tri- kinds of frame formats of OFDM MU-MIMO
Method, comprises the following steps：
(1) website operated under some Basic Service Set, when not accessing channel, reception is placed in by radio frequency link
State, repeats arrival of the detection frame until detecting a frame, into step (2)；
(2) receiver is estimated using lead code completion carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients
Meter；
(3) after being based on the time domain channel coefficients of acquisition in step (2) to SIG-A reception processings, cyclic redundancy is done to SIG-A
Verify (CRC:Cyclic Redundancy Check), if examining failure, return to step (1), if verified successfully,
Into step (4)；
(4) information of each subfield in SIG-A is parsed, SC/OFDM subfields and GroupID in SIG-A
Field judgement draws PPDU frame format type, the relevant parameter needed for demodulation PPDU is calculated for specific frame format type, such as
Fruit receiver does not support the Modulation and Coding Scheme (MCS that SIG-A is indicated:Modulation and coding scheme), then etc.
After treating certain time length, return to step (1), otherwise, into step (5)；
Above-mentioned relevant parameter is specially：
If 1) PPDU is SC MIMO PPDU, parameter includes the code word number N of data fieldCWWith SC symbol block numbers NBLK；
NCWCalculation formula it is as follows：
(formula 1)
In formula 1, Length is the subfield that SIG-A represents the PPDU data loads, and unit is byte, LCWWith R difference
Represent low-density parity test code (LDPC:Low Density Parity Check) code word code length and code check；
NBLKCalculation formula it is as follows：
(formula 2)
In formula 2, NCBPBIt is the number of coded bits of each symbolic blocks of data field, value is adjusted by the SIG-A codings indicated
Scheme processed and spatial flow number are together decided on, when the PPDU is that non-STBC is sent, mSTBC=1, when the PPDU is STBC modes
During transmission, mSTBC=2, when the PPDU be defined orthogonal STBC modes send when, mSTBC=4.
If 2) PPDU is OFDM MIMO PPDU, parameter includes the OFDM symbol number N of data fieldsym；
NsymCalculation formula it is as follows：
(formula 3)
In formula 3, NCBPSRepresent number of coded bits in each OFDM symbol, NCBPSValue depends on the coding tune that SIG-A is indicated
Scheme processed and spatial flow number, lcm { } represent to take least common multiple, according to indicating for SIG-A NSTS/PAID subfields
To spatial stream number NSTS。
If 3) PPDU is OFDM MU-MIMO PPDU, parameter includes the space-time fluxion and corresponding position corresponding to this website
Put；Computational methods are：The value of subfield GroupID first in SIG-A determines the user index corresponding to this website
Number, the then space-time fluxion N according to corresponding to NSTS/PAID determines this websiteSTS,uAnd corresponding position, u represents user index
Number and value be 0~3 between an integer.As u=0, the 1st to NSTS,0Individual empty time stream is the sky for being sent to user 0
Shi Liu, as u ≠ 0,It is individual toIndividual empty time stream is user u empty time stream, wherein, NSTS,iFor
The corresponding space-time flow amounts of user i that MU [i] NSTS subfields are indicated in SIG-A.
(5) information of the subfield in SIG-A judges whether the PPDU is relevant with this website, if the PPDU and our station
Point is unrelated, then receiver does not handle the PPDU, waits certain time length, return to step (1), otherwise, into step (6)；Specifically sentence
Disconnected method is：If meeting any one following condition, then it represents that the PPDU is unrelated with this website, otherwise relevant with this website：
1) PAID in (including SC MIMO PPDU and OFDM MIMO PPDU), SIG-A as GroupID=0 or 63
Non- website of recipient that subfield is indicated；
2) when GroupID certain number being entered as between 1~62, this website is not belonging to the sub- words of GroupID in SIG-A
The Website Hosting corresponding to packet number that section is indicated；
3) when GroupID certain number being entered as between 1~62, this website belongs to GroupID subfields in SIG-A
Website Hosting corresponding to the packet number of instruction, but the value of MU [u] NSTS subfields is 0 in SIG-A, that is, in the PPDU sent
Data not comprising this website, u is the user index number corresponding to this website.
(6) demodulation mode is determined according to PPDU frame format types, if the PPDU is SC MIMO PPDU, performs step
(7), if the PPDU is OFDM MIMO PPDU, step (8) is performed, otherwise, step (9) is performed；
(7) further part of the PPDU is demodulated in the way of SC MIMO；
(8) further part of the PPDU is demodulated in the way of OFDM SU MIMO；
(9) further part of the PPDU is demodulated in the way of OFDM MU-MIMO.
The specific steps of the step (7) include：
(7.1) if the power of data field signal is less than the treatable threshold value of receiver, certain time length, return to step are waited
(1), otherwise, receive and handle SC symbolic blocks, its process includes deprotection interval, balanced, solution constellation mapping and conciliates stream parsing；
(7.2)NBLK:=NBLK- 1, i.e., by NBLKValue subtract 1 and be assigned to NBLKIf, NBLKValue be more than 1, then return to step
(7.1), otherwise, into step (7.3)；
(7.3) N is retained according to the result of calculation of step (4)CW×LCWThe data of individual bit, are decoded by ldpc decoder
After descrambling, the zero padding bit of code word zero padding is removed, i.e., is taken according to the instruction of SIG-A Length subfields before data flow
The data of Length byte, the data sent terminate PPDU reception process, reception state are configured without into mistake
By mistake, then certain time length, return to step (1) are waited.
The specific steps of the step (8) include：
(8.1) estimate MIMO-OFDM equivalent channel matrix using multicarrier training field, respectively obtain on each subcarrier
Equivalent channel matrix H on channel matrix, subcarrier kkSize be NRXRow NSTSRow, NRXRepresent the reception antenna number of this website；
(8.2) if the power of data field signal is less than the treatable threshold value of receiver, certain time length, return to step are waited
(1) OFDM symbol, otherwise, is received based on the equivalent channel matrix obtained by step (8.1), its process includes deprotection and is spaced,
Weighing apparatus, solution LDPC subcarrier maps, solution constellation mapping, which are conciliate, to flow parsing and the data solved after stream parsing is operated is stored in into buffering area；
(8.3)Nsym:=Nsym- 1, i.e., by NsymValue subtract 1 and be assigned to NsymIf, Nsym=0, then it is no into step (8.4)
Then, return to step (8.2)；
(8.4) the sequence LDPC obtained by step (8.2) is decoded, after descrambling operation, according to the sub- words of SIG-A Length
Section instructions go zero padding take data flow preceding Length byte data, obtain send data, wait certain time length, return
Step (1).
The specific steps of the step (9) include：
(9.1) empty time stream position and space-time flow amount of this website obtained based on step (4), are trained using multicarrier
Field estimates MIMO-OFDM equivalent channel matrix, respectively obtains the equivalent letter on the channel matrix on each subcarrier, subcarrier k
Road matrix HkSize be NRXRow NSTS,uRow；
(9.2) receiver estimates that obtained equivalent channel matrix receives and demodulates SIG-B based on step (9.1), to SIG-B
CRC is, if CRC check fails, certain time length, return to step (1), otherwise, into step (9.3) is waited；
(9.3) if receiver can handle the MCS of SIG-B instructions, into step (9.4), otherwise, a timing is waited
It is long, return to step (1)；
(9.4) parameter related to PPDU receptions, including length (data field byte number) and receiver are configured
Need the data field OFDM symbol number N of demodulationsym, NsymComputational methods it is as follows：
(formula 4)
In formula 4, NCBPS,uValue in MU MCS subfields in the SIG-B of u-th of user and SIG-A MU [u] NSTS
Subfield decision, LengthuValue be equal to the values of Length fields in the SIG-B of u-th user；
(9.5) if the power of data field signal is less than the treatable threshold value of receiver, certain time length, return to step are waited
(1) OFDM symbol, otherwise, is received based on the equivalent channel matrix obtained by step (9.1), its process is included between deprotection
Every, balanced, solution LDPC subcarrier maps, solution constellation mapping conciliate stream parsing and will solve the data of stream parsing and be stored in buffering area；
(9.6)Nsym:=Nsym- 1, i.e., by NsymValue subtract 1 and be assigned to NsymIf, Nsym=0, then it is no into step (9.7)
Then, return to step (9.5)；
(9.7) instruction of the SIG-B received according to this website Length subfields goes zero padding to take before data flow
LengthuThe data of individual byte, obtain sending data, wait certain time length, return to step (1).
A kind of reception device using the as above MIMO communication system of compatible a variety of frame formats of method, including：Frame is detected
Module, lead code processing module, SIG-A processing modules, SIG-A fields parsing module, website judge module, demodulation selection mould
Block, SC MIMO demodulation modules, OFDM SU MIMO demodulation modules and OFDM MU-MIMO demodulation modules；Wherein,
Frame detection module, for website in no access channel, is placed in reception state by radio frequency link, repeats detection frame
Arrival until detecting a frame, a frame data are exported to lead code processing module；
Lead code processing module, the frame data exported for receiving frame detection module complete carrier frequency using lead code
Rate is synchronous, time synchronized and SC MIMO time domain channel coefficients are estimated；
SIG-A processing modules, for doing cyclic redundancy to SIG-A reception processings, and to SIG-A according to time domain channel coefficients
Verification；
SIG-A field parsing modules, for parsing the information of each subfield in SIG-A, and calculate demodulation PPDU institutes
The relevant parameter needed；
Website judge module, the sub-domain information for being obtained according to SIG-A field parsing modules judges what is received
Whether PPDU is relevant with this website；
Selecting module is demodulated, the mode for selecting specific demodulation PPDU according to frame format type；
SC MIMO demodulation modules, for the relevant parameter that is obtained according to SIG-A field parsing modules with SC MIMO side
Formula demodulates PPDU SC data fields；
OFDM SU MIMO demodulation modules, for the relevant parameter that is obtained according to SIG-A field parsing modules with OFDM SU
MIMO mode demodulates PPDU multicarrier training field and OFDM data field；
And,
OFDM MU-MIMO demodulation modules, for the relevant parameter that is obtained according to SIG-A field parsing modules with OFDM
MU-MIMO mode demodulates multicarrier training field, SIG-B and the OFDM data field of the PPDU.
Brief description of the drawings
Fig. 1 is the overview flow chart of the embodiment of the present invention；
Fig. 2 is the schematic diagram of the SIG-A parts field of the embodiment of the present invention；
Fig. 3 is the schematic diagram of the SIG-B parts field of the embodiment of the present invention.
Embodiment
The technology of the present invention can be used for various system of broadband wireless communication, and the radio node of realization can include access point
Or access terminal, the example of this communication system includes millimeter wave wireless MIMO communication systems etc..
Below by taking millimeter wave WLAN (IEEE 802.11aj) 540MHz bandwidth as an example, with reference to accompanying drawing to the present invention
A kind of method of reseptance of MIMO communication system of compatible a variety of frame formats and the embodiment of device are made further specifically
Bright, wherein frame format includes following three types：
SC MIMO frame structures, i.e. SC lead codes (referred to as SC Preamble), the knot of SC SIG-A and SC data fields
Structure, it can include the synchronous training fields of SC (referred to as SC STF), SC channel estimations training field (referred to as SC CTF), SC
SIG-A, SC data field.
Single User MIMO frame structure, i.e. SC lead codes (referred to as SC Preamble), the knot of SC SIG-A and OFDM fields
Structure, it can include the synchronous training fields of SC (referred to as SC STF), SC channel estimations 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 codes (referred to as SC Preamble), the knot of SC SIG-A and OFDM fields
Structure, it can include the synchronous training fields of SC (referred to as SC STF), SC channel estimations 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 (IEEE 802.11aj) standard, the related parameter of system is defined, such as the institute of table 1
Show, these parameters are directly used in discussion below.
The millimeter wave WLAN relevant parameter of table 1
In the embodiment of the present invention, receiver is configured with 2 antennas, and the MCS value that SC MIMO PPDU are used is 3, that is, is modulated
Mode is pi/2-16-QAM, and code check sends for 1/2 mode, and single PSDU length is 4000 bytes, the spatial data fluxion of use
For 2, sent in the way of non-STBC；The MCS value that OFDM MIMO PPDU are used is 3, i.e., modulation system is 16-QAM, and code check is
1/2, single PSDU length is 4000 bytes, and the spatial data fluxion used is sent for 2 in the way of non-STBC；In OFDM MU-
In MIMO PPDU embodiment, PSDU length is respectively 4000 bytes and 6000 bytes, and the spatial data fluxion of use is respectively
2 and 1, receiver is the 0th user of the PPDU, and the MCS value of the 0th user is 3, i.e., modulation system is 16-QAM, and code check is
1/2.This example demonstrates that the processing procedure of receiver.Support different bandwidth, different spaces data fluxion and different modulating mode
The example that can change in the present embodiment of scene obtain.
Fig. 1 is the overall procedure of the method for reseptance of the MIMO communication system of compatible a variety of frame formats of the embodiment of the present invention
Figure, it is detailed to receive SC MIMO PPDU, OFDM MIMO PPDU and OFDM MU-MIMO tri- examples of PPDU separately below
The concrete operation step of thin description the inventive method embodiment.
Example 1：Receive a SC MIMO PPDU
(A1) website that operates under some Basic Service Set, when not accessing channel, radio frequency link is placed in and connect
Receipts state, repeats arrival of the detection frame until detecting a frame, into step (A2)；
(A2) receiver is estimated using lead code completion carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients
Meter；
(A3) after being based on the time domain channel coefficients of acquisition in step (A2) to SIG-A reception processings, SIG-A concrete structure
See Fig. 2, CRC is done to SIG-A, if examining failure, return to step (A1), if verified successfully, enter step
Suddenly (A4)；
(A4) information of each subfield in SIG-A is parsed, because the PPDU in this example, received is SC MIMO
PPDU, so the value of SC/OFDM subfields is 0 in SIG-A, calculates the relevant parameter demodulated needed for the PPDU, data field
Code word number NCWWith SC symbol block numbers NBLK, calculation procedure is as follows:
1) the code word number N of data field is calculatedCW:
Parameter configuration knows L in embodimentCW=672, subfield Length indicates to know Length=4000 in SIG-A,
Subfield SU MCS instruction knows that the modulation system of the PPDU is pi/2-16-QAM in SIG-A, and code check is 1/2, according to formula 1
Calculating is obtained：
(formula 5)
2) data field symbols block number N is calculatedBLK:
Parameter configuration knows m in embodimentSTBC=1, NCBPB=2048, calculated and obtained according to formula 2：
(formula 6)
If receiver do not support SIG-A indicate MCS, wait certain time length after, return to step (A1), otherwise,
Into step (A5)；
(A5) whether receiver judges the PPDU with having with this website according to the instruction of subfield NSTS/PAID in SIG-A
Close, if non-website of recipient that PAID subfields are indicated in SIG-A, represents that the PPDU is unrelated with this website, then receiver
The PPDU is not handled, waits certain time length, return to step (A1), otherwise, into step (A6)；
(A6) if the power of data field signal is less than the treatable threshold value of receiver, certain time length is waited, step is returned
Suddenly (A1), otherwise, receive and handle SC symbolic blocks, its process includes deprotection interval, balanced, solution constellation mapping and conciliates stream solution
Analysis；
(A7)NBLK:=NBLK- 1, i.e., by NBLKValue subtract 1 and be assigned to NBLKIf, NBLKValue be more than 1, then return to step
(A6), otherwise, into step (A8)；
(A8) according to the result of calculation of step (A4) retain 64512 bits data, by ldpc decoder decoding and
After descrambling, the zero padding bit of code word zero padding is removed, i.e., is taken according to the instruction of SIG-A Length subfields before data flow
The data of Length byte, the data sent terminate PPDU reception process, reception state are configured without into mistake
By mistake, then certain time length, return to step (A1) are waited.
Example 2：Receive an OFDM MIMO PPDU
(B1) website that operates under some Basic Service Set, when not accessing channel, radio frequency link is placed in and connect
Receipts state, repeats arrival of the detection frame until detecting a frame, into step (B2)；
(B2) receiver is estimated using lead code completion carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients
Meter；
(B3) after being based on the time domain channel coefficients of acquisition in step (B2) to SIG-A reception processings, circulation is done to SIG-A superfluous
Remaining verification, if examining failure, return to step (B1), if verified successfully, into step (B4)；
(B4) information of each subfield in SIG-A is parsed, the relevant parameter demodulated needed for the PPDU, data field is calculated
OFDM symbol number NsymCalculating process it is as follows：
L is known by the parameter configuration in embodimentCW=672, subfield Length indicates to know Length=in SIG-A
4000, subfield SU MCS instruction knows that the modulation system of the PPDU is 16-QAM in SIG-A, and code check is 1/2, by SIG-A
N is known in middle subfield SU NSTS instructionSTS=2, so NCBPS=1344, calculated and obtained according to formula 3：
(formula 7)
If receiver do not support SIG-A indicate MCS, wait certain time length after, return to step (B1), otherwise,
Into step (B5)；
(B5) whether receiver judges the PPDU with having with this website according to the instruction of subfield NSTS/PAID in SIG-A
Close, if non-website of recipient that PAID subfields are indicated in SIG-A, represents that the PPDU is unrelated with this website, then receiver
The PPDU is not handled, waits certain time length, return to step (B1), otherwise, into step (B6)；
(B6) estimate MIMO-OFDM equivalent channel matrix using multicarrier training field, respectively obtain on each subcarrier
Equivalent channel matrix H on channel matrix, subcarrier kkSize arrange for 2 rows 2；
(B7) if the power of data field signal is less than the treatable threshold value of receiver, certain time length is waited, step is returned
Suddenly (B1), otherwise, based on obtained by step (B6) equivalent channel matrix receive OFDM symbol, its process include deprotection interval,
Balanced, solution LDPC subcarrier maps, solution constellation mapping, which conciliate to flow parsing and be stored in the data solved after stream parsing is operated, to be buffered
Area；
(B8)Nsym:=Nsym- 1, i.e., by NsymValue subtract 1 and be assigned to NsymIf, Nsym=0, then into step (B9), otherwise,
Return to step (B7)；
(B9) the sequence LDPC obtained by step (B7) is decoded, after descrambling operation, according to SIG-A Length subfields
Instruction go zero padding take data flow preceding 4000 bytes data, obtain send data, wait certain time length, return to step
(B1)。
Example 3：Receive an OFDM MU-MIMO PPDU
(C1) website that operates under some Basic Service Set, when not accessing channel, radio frequency link is placed in and connect
Receipts state, repeats arrival of the detection frame until detecting a frame, into step (C2)；
(C2) receiver is estimated using lead code completion carrier frequency synchronization, time synchronized and SC MIMO time domain channel coefficients
Meter；
(C3) after being based on the time domain channel coefficients of acquisition in step (C2) to SIG-A reception processings, circulation is done to SIG-A superfluous
Remaining verification, if examining failure, return to step (C1), if verified successfully, into step (C4)；
(C4) the subfield SC/OFDM=1 and sub- word of SIG-A in the information of each subfield in SIG-A, this example is parsed
Section GroupID certain number being entered as between 1~62, the value of the subfield GroupID in SIG-A determines this website
It is OFDM MU-MIMO PPDU the 0th user, then the space-time fluxion according to corresponding to NSTS/PAID determines this website is
2, position is that empty time stream 1 arrives empty time stream 2, if receiver does not support the MCS that SIG-A is indicated, waits after certain time length, returns
Step (C1) is returned, otherwise, into step (C5)；
(C5) subfield GroupID of the receiver in SIG-A and the finger of two subfields of subfield NSTS/PAID
Show, judge the PPDU and whether relevant with this website, any one following condition of satisfaction：
1) this website is not belonging to the Website Hosting corresponding to the packet number that GroupID subfields are indicated in SIG-A；
If 2) this website belongs to the Website Hosting corresponding to the packet number that GroupID subfields are indicated in SIG-A, still
The value of MU [0] NSTS subfields is the data not comprising this website in 0, that is, the PPDU sent in SIG-A.
Represent that the PPDU is unrelated with this website, then receiver does not handle the PPDU, wait certain time length, return to step
(C1), otherwise, into step (C6), above-mentioned condition is unsatisfactory in this example and enters step (C6)；
(C6) empty time stream position and space-time flow amount of this website obtained based on step (C4), are trained using multicarrier
Field estimates MIMO-OFDM equivalent channel matrix, respectively obtains the equivalent letter on the channel matrix on each subcarrier, subcarrier k
Road matrix HkSize arrange for 2 rows 2；
(C7) receiver estimates that obtained equivalent channel matrix receives and demodulates SIG-B based on step (C6), SIG-B tool
Body structure is shown in Fig. 3, and CRC is to SIG-B, if CRC check fails, waits certain time length, return to step (C1) otherwise, is entered
Enter step (C8)；
(C8) if receiver can handle the MCS of SIG-B instructions, into step (C9), otherwise, a timing is waited
It is long, return to step (C1)；
(C9) parameter related to PPDU receptions is configured, including length (data field byte number) and receiver are needed
The data field OFDM symbol number N to be demodulatedsym, NsymComputational methods it is as follows：
L is known by the parameter configuration in embodimentCW=672, subfield Length indicates to know Length in SIG-B0=
4000, subfield MCS instruction knows that the modulation system of the PPDU is 16-QAM in SIG-B, and code check is 1/2, by SIG-A neutrons
N is known in field MU [0] NSTS instructionSTS=2, so NCBPS,0=1344, calculated and obtained according to formula 4：
(formula 8)
(C10) if the power of data field signal is less than the treatable threshold value of receiver, certain time length is waited, step is returned
Suddenly (C1), otherwise, an OFDM symbol is received based on the equivalent channel matrix obtained by step (C6), its process is included between deprotection
Every, balanced, solution LDPC subcarrier maps, solution constellation mapping conciliate stream parsing and will solve the data of stream parsing and be stored in buffering area；
(C11)Nsym:=Nsym- 1, i.e., by NsymValue subtract 1 and be assigned to NsymIf, Nsym=0, then it is no into step (C12)
Then, return to step (C10)；
(C12) instruction of the SIG-B received according to this website Length subfields goes zero padding to take before data flow
The data of 4000 bytes, obtain sending data, wait certain time length, return to step (C1).
The embodiment of the present invention additionally provides a kind of using the as above MIMO communication system of compatible a variety of frame formats of method
Reception device, including：Frame detection module, lead code processing module, SIG-A processing modules, SIG-A fields parsing module, website
Judge module, demodulation selecting module, SC MIMO demodulation modules, OFDM SU MIMO demodulation modules and OFDM MU-MIMO solutions
Mode transfer block；Wherein,
Frame detection module, for website in no access channel, is placed in reception state by radio frequency link, repeats detection frame
Arrival until detecting a frame, a frame data are exported to lead code processing module；
Lead code processing module, the frame data exported for receiving frame detection module complete carrier frequency using lead code
Rate is synchronous, time synchronized and SC MIMO time domain channel coefficients are estimated；
SIG-A processing modules, for doing cyclic redundancy to SIG-A reception processings, and to SIG-A according to time domain channel coefficients
Verification；
SIG-A field parsing modules, for parsing the information of each subfield in SIG-A, and calculate demodulation PPDU institutes
The relevant parameter needed；
Website judge module, the sub-domain information for being obtained according to SIG-A field parsing modules judges what is received
Whether PPDU is relevant with this website；
Selecting module is demodulated, the mode for selecting specific demodulation PPDU according to frame format type；
SC MIMO demodulation modules, for the relevant parameter that is obtained according to SIG-A field parsing modules with SC MIMO side
Formula demodulates PPDU SC data fields；
OFDM SU MIMO demodulation modules, for the relevant parameter that is obtained according to SIG-A field parsing modules with OFDM SU
MIMO mode demodulates PPDU multicarrier training field and OFDM data field；
And,
OFDM MU-MIMO demodulation modules, for the relevant parameter that is obtained according to SIG-A field parsing modules with OFDM
MU-MIMO mode demodulates multicarrier training field, SIG-B and the OFDM data field of the PPDU.
Claims (9)
1. a kind of method of reseptance of multiple-input and multiple-output (MIMO) communication system of compatible a variety of frame formats, the MIMO communication systems
The frame structure of the physical layer protocol data unit (PPDU) of system includes：
Single carrier (SC) MIMO PPDU frame structures, include SC lead codes, SC signaling fields A (SIG-A) and SC data fields；
OFDM (OFDM) MIMO PPDU frame structures, comprising SC lead codes, SC SIG-A, multicarrier training field and
OFDM data field；And,
OFDM MU-MIMO PPDU frame structures, include SC lead codes, SC SIG-A, multicarrier training field, signaling field B
And OFDM data field (SIG-B)；
Characterized in that, the method for reseptance comprises the following steps：
(1) website operated under some Basic Service Set, when not accessing channel, reception shape is placed in by radio frequency link
State, repeats arrival of the detection frame until detecting a frame, into step (2)；
(2) receiver completes carrier frequency synchronization, time synchronized and the estimation of SC MIMO time domain channel coefficients using lead code；
(3) after being based on the time domain channel coefficients of acquisition in step (2) to SIG-A reception processings, CRC is done to SIG-A
(CRC), if examining failure, return to step (1), if verified successfully, into step (4)；
(4) information of each subfield in SIG-A, SC/OFDM subfields and GroupID subfields in SIG-A are parsed
Judgement draws PPDU frame format type, the relevant parameter needed for demodulation PPDU is calculated for specific frame format type, if connect
Receipts machine does not support the Modulation and Coding Scheme (MCS) that SIG-A is indicated, then waits after certain time length, return to step (1) otherwise, is entered
Enter step (5)；
The relevant parameter is specially：
If PPDU is SC MIMO PPDU, include the code word number N of data fieldCWWith SC symbol block numbers NBLK；
If PPDU is OFDM MIMO PPDU, include the OFDM symbol number N of data fieldsym；
If PPDU is OFDM MU-MIMO PPDU, including the space-time fluxion corresponding to this website and corresponding position；
(5) information of the subfield in SIG-A judges whether the PPDU relevant with this website, if the PPDU and this website without
Close, then receiver does not handle the PPDU, wait certain time length, return to step (1), otherwise, into step (6)；
(6) demodulation mode is determined according to PPDU frame format types, if the PPDU is SC MIMO PPDU, performs step (7), if
The PPDU is OFDM MIMO PPDU, then performs step (8), otherwise, performs step (9)；
(7) further part of the PPDU is demodulated in the way of SC MIMO；
(8) further part of the PPDU is demodulated in the way of OFDM SU MIMO；
(9) further part of the PPDU is demodulated in the way of OFDM MU-MIMO.
2. the method for reseptance of the MIMO communication system of compatible a variety of frame formats according to claim 1, it is characterised in that：
The code word number N of the data fieldCWCalculation formula be：
In formula 1, Length is the subfield that SIG-A represents the PPDU data loads, and unit is byte, LCWRepresented respectively with R
The code length and code check of low-density parity test code code word；
The SC symbols block number NBLKCalculation formula be：
In formula 2, NCBPBIt is the number of coded bits of each symbolic blocks of data field, the coded modulation scheme that value is indicated by SIG-A
Together decided on spatial flow number, when the PPDU is that non-STBC is sent, mSTBC=1, when the PPDU is that STBC modes are sent,
mSTBC=2, when the PPDU be defined orthogonal STBC modes send when, mSTBC=4.
3. the method for reseptance of the MIMO communication system of compatible a variety of frame formats according to claim 1, it is characterised in that：
The OFDM symbol number N of the data fieldsymCalculation formula be：
In formula 3, Length is the subfield that SIG-A represents the PPDU data loads, and unit is byte, NCBPSRepresent each
Number of coded bits in OFDM symbol, NCBPSValue depends on coded modulation scheme and the spatial flow number that SIG-A is indicated, lcm { }
Expression takes least common multiple, and spatial stream number N is obtained according to the instruction of SIG-A NSTS/PAID subfieldsSTS, LCWDistinguish table with R
Show the code length and code check of low-density parity test code code word, when the PPDU is that non-STBC is sent, mSTBC=1, as the PPDU
When being sent for STBC modes, mSTBC=2, when the PPDU be defined orthogonal STBC modes send when, mSTBC=4.
4. the method for reseptance of the MIMO communication system of compatible a variety of frame formats according to claim 1, it is characterised in that：
The computational methods of space-time fluxion and corresponding position corresponding to described website are：Sub- word first in SIG-A
Section GroupID value determines the user index number corresponding to this website, then according to corresponding to NSTS/PAID determines this website
Space-time fluxion NSTS,uAnd corresponding position, u represents user index number；As u=0, the 1st to NSTS,0Individual empty time stream is
The empty time stream of user 0 is sent to, as u ≠ 0,It is individual toIndividual empty time stream is user u empty time stream,
Wherein, NSTS,iThe corresponding space-time flow amounts of user i indicated for [i] NSTS of MU in SIG-A subfields.
5. the method for reseptance of the MIMO communication system of compatible a variety of frame formats according to claim 1, it is characterised in that institute
The information for stating the subfield in step (5) in SIG-A judges the PPDU specific determination methods whether relevant with this website
For：
Subfield GroupID of the receiver in SIG-A and subfield NSTS/PAID instruction, judge the PPDU with whether
It is relevant with this website, if meeting any one following condition, then it represents that the PPDU is unrelated with this website, otherwise has with this website
Close：
As GroupID=0 or 63, non-website of recipient that PAID subfields are indicated in SIG-A；
When GroupID certain number being entered as between 1~62, this website is not belonging to GroupID subfields in SIG-A and indicated
Packet number corresponding to Website Hosting；
When GroupID certain number being entered as between 1~62, this website belongs to what GroupID subfields in SIG-A were indicated
Website Hosting corresponding to packet number, but the value of MU [u] NSTS subfields is that 0, u is use corresponding to this website in SIG-A
The call number at family.
6. the method for reseptance of the MIMO communication system of compatible a variety of frame formats according to claim 1, it is characterised in that institute
Stating the specific steps of step (7) includes：
(7.1) if the power of data field signal be less than the treatable threshold value of receiver, wait certain time length, return to step (1),
Otherwise, receive and handle SC symbolic blocks, its process includes deprotection interval, balanced, solution constellation mapping and conciliates stream parsing；
(7.2) by NBLKValue subtract 1 and be assigned to NBLKIf, NBLKValue be more than 1, then return to step (7.1), otherwise, into step
(7.3)；
(7.3) N is retained according to the result of calculation of step (4)CW×LCWThe data of individual bit, decode and descramble by ldpc decoder
Afterwards, the zero padding bit of code word zero padding is removed, the data sent terminate PPDU reception process, reception state is set
Into no mistake, then certain time length, return to step (1), L are waitedCWRepresent the code length of low-density parity test code code word.
7. the method for reseptance of the MIMO communication system of compatible a variety of frame formats according to claim 1, it is characterised in that institute
Stating the specific steps of step (8) includes：
(8.1) estimate MIMO-OFDM equivalent channel matrix using multicarrier training field, respectively obtain the channel on each subcarrier
Equivalent channel matrix H on matrix, subcarrier kkSize be NRXRow NSTSRow, NRXRepresent the reception antenna number of this website, NSTS
Represent the spatial stream number obtained according to the instruction of SIG-A NSTS/PAID subfields；
(8.2) if the power of data field signal be less than the treatable threshold value of receiver, wait certain time length, return to step (1),
Otherwise, OFDM symbol is received based on the equivalent channel matrix obtained by step (8.1), its process includes deprotection interval, balanced, solution
LDPC subcarrier maps, solution constellation mapping conciliate stream parsing and the data after solution stream parsing operation are stored in into buffering area；
(8.3) by NsymValue subtract 1 and be assigned to NsymIf, Nsym=0, then into step (8.4), otherwise, return to step (8.2)；
(8.4) the sequence LDPC obtained by step (8.2) is decoded, after descrambling operation, according to SIG-A Length subfields
Zero padding is gone in instruction, is obtained sending data, is waited certain time length, return to step (1).
8. the method for reseptance of the MIMO communication system of compatible a variety of frame formats according to claim 1, it is characterised in that institute
Stating the specific steps of step (9) includes：
(9.1) empty time stream position and space-time flow amount of this website obtained based on step (4), utilize multicarrier training field
Estimate MIMO-OFDM equivalent channel matrix, respectively obtain the equivalent channel square on the channel matrix on each subcarrier, subcarrier k
Battle array HkSize be NRXRow NSTS,uRow, NRXRepresent the reception antenna number of this website, NSTS,uRepresent the sub- words of MU [u] NSTS in SIG-A
The corresponding space-time flow amounts of user u that section is indicated；
(9.2) receiver estimates that obtained equivalent channel matrix receives and demodulates SIG-B based on step (9.1), and SIG-B is done
CRC, if CRC check fails, waits certain time length, return to step (1), otherwise, into step (9.3)；
(9.3) if receiver can handle the MCS of SIG-B instructions, into step (9.4), otherwise, certain time length is waited,
Return to step (1)；
(9.4) parameter related to PPDU receptions is configured, including data field byte number and receiver need what is demodulated
Data field OFDM symbol number Nsym, NsymComputational methods it is as follows：
In formula 4, NCBPS,uValue in MU MCS subfields in the SIG-B of u-th of user and SIG-A the words of MU [u] NSTS
Section decision, LengthuValue be equal to the values of Length fields in the SIG-B of u-th user, lcm { } represents to take minimum public affairs
Multiple, LCWRepresent the code length and code check of low-density parity test code code word respectively with R；
(9.5) if the power of data field signal be less than the treatable threshold value of receiver, wait certain time length, return to step (1),
Otherwise, an OFDM symbol is received based on the equivalent channel matrix obtained by step (9.1), its process includes deprotection and is spaced,
Weighing apparatus, solution LDPC subcarrier maps, solution constellation mapping, which are conciliate, to flow parsing and will solve the data deposit buffering area for flowing parsing；
(9.6) by NsymValue subtract 1 and be assigned to NsymIf, Nsym=0, then into step (9.7), otherwise, return to step (9.5)；
(9.7) zero padding is gone in the instruction of the SIG-B received according to this website Length subfields, is obtained sending data, is waited
Certain time length, return to step (1).
9. a kind of recipient of the MIMO communication system of compatible a variety of frame formats of any one using according to claim 1-8
The reception device of the MIMO communication system of compatible a variety of frame formats of method, it is characterised in that including：Frame detection module, lead code
Processing module, SIG-A processing modules, SIG-A fields parsing module, website judge module, demodulation selecting module, SC MIMO solutions
Mode transfer block, OFDM SU MIMO demodulation modules and OFDM MU-MIMO demodulation modules；Wherein,
Frame detection module, for website in no access channel, reception state is placed in by radio frequency link, repeat detection frame until
The arrival of a frame is detected, a frame data are exported to lead code processing module；
Lead code processing module, the frame data exported for receiving frame detection module complete carrier frequency same using lead code
Step, time synchronized and the estimation of SC MIMO time domain channel coefficients；
SIG-A processing modules, for, to SIG-A reception processings, and doing cyclic redundancy school to SIG-A according to time domain channel coefficients
Test；
SIG-A field parsing modules, for parsing the information of each subfield in SIG-A, and calculate demodulation PPDU needed for
Relevant parameter；
Website judge module, the sub-domain information for being obtained according to SIG-A field parsing modules judges that the PPDU received is
It is no relevant with this website；
Selecting module is demodulated, the mode for selecting specific demodulation PPDU according to frame format type；
SC MIMO demodulation modules, for the relevant parameter that is obtained according to SIG-A field parsing modules in the way of SC MIMO solution
Adjust PPDU SC data fields；
OFDM SU MIMO demodulation modules, for the relevant parameter that is obtained according to SIG-A field parsing modules with OFDM SU
MIMO mode demodulates PPDU multicarrier training field and OFDM data field；
And,
OFDM MU-MIMO demodulation modules, for the relevant parameter that is obtained according to SIG-A field parsing modules with OFDM MU-
MIMO mode demodulates multicarrier training field, SIG-B and the OFDM data field of the PPDU.
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