CN100574127C - A kind of BLAST receive-transmit system - Google Patents
A kind of BLAST receive-transmit system Download PDFInfo
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- CN100574127C CN100574127C CNB200710018095XA CN200710018095A CN100574127C CN 100574127 C CN100574127 C CN 100574127C CN B200710018095X A CNB200710018095X A CN B200710018095XA CN 200710018095 A CN200710018095 A CN 200710018095A CN 100574127 C CN100574127 C CN 100574127C
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Abstract
The invention discloses a kind of BLAST receive-transmit system.This system's transmitting terminal comprises encoder, interleaver, parallel-to-serial converter, modulator, converter when empty, and receiving terminal comprises soft inputting and soft output detector, decoder, interleaver, deinterleaver, parallel-to-serial converter, converter when empty, inverse transformer when empty.Sequence after this transmitting terminal Unified coding is mapped to when empty carries out on the different antennae launching behind the absolute coding again, and with similar Turbo coded system cascade Unified coding device and branch road encoder; This receiving terminal is to the received signal after soft output detects, demultiplexing is the code word prior information of each branch road decoder and the check bit prior information of unified decoder respectively, the branch road decoder to each branched sequence soft decoding after, output information bit external information, behind parallel serial conversion, carry out soft decoding again, conclusive judgement output as the information bit prior information of unified decoder.The present invention has the low and advantage flexibly of encoding of the error rate, can be used for MIMO wireless high-speed transport communication system.
Description
Technical field
The invention belongs to communication technical field, relate to receive-transmit system, specifically be used for the BLAST receive-transmit system of many antennas mimo wireless communication.
System.
Background technology
In recent years,, make mobile communication, radio communication, MMS (Multimedia Message Service) and internet, carry out the information interaction of any kind of at any time and any place, convenience is provided for realizing anyone along with developing rapidly of ICT (information and communication technology) and application system thereof.But existing 3-G (Generation Three mobile communication system) has been difficult to satisfy future mobile communications two-forty, multi-service, high-quality communication and transfer of data demand, people have proposed the notion of super 3G or 4G again for this reason, and a plurality of International Standards Organization and forum are also actively developing the research of future mobile communications.For example, International Telecommunications Union-ITU-R of radio communication portion goes out in the document to the future development of the global standards IMT-2000 of third generation radio communication and super IMT-2000 system: the ability of IMT-2000 land wave point will expand to nearly 30Mbps about 2005; Imagination under high-speed mobile condition, will support the peak rate of about 100Mbps in the new system of super IMT-2000 about 2010, under the low speed mobile condition, will support the peak rate of about 1Gbps.
The big key problem in technology that the support future mobile communications two-forty of current extensive approval requires is the multiple-input and multiple-output mimo system, and the MIMO technology can improve the channel capacity of wireless channel exponentially under the prerequisite that does not increase system bandwidth and through-put power.According to information theory, if different send-receive antennas between channel fading separate, under identical transmitting power and bandwidth, the channel capacity that mimo system that has M transmitting antenna and a N reception antenna can reach is the min (M of existing a single aerial system, N) doubly, thus provide the unrivaled capacity of current other technology to promote potentiality.Use MIMO can obtain two kinds of gains usually: diversity gain and spatial multiplexing gain.In order to realize the transmission of high-speed data, need to obtain big as far as possible spatial multiplexing gain.The BLAST system that is proposed by Bell Laboratory adopts the different sub data flow of different transmit antennas emission the earliest, has obtained maximum spatial multiplexing gain.
At present, the basic system that centers on the BLAST system has derived multiple emission system structure, for example adopts the D-BLAST of diagonal angle layered space-time architecture, adopts the T-BLAST of spiral layered space-time architecture etc.; There are the vertical coding BLAST V-BLAST of system, the level code BLAST H-BLAST of system in the system that realizes in conjunction with encoding scheme.Appearance along with Turbo code, iterative technique is paid close attention to by people gradually, the corresponding generation of various BLAST system of making a start and combining with the Turbo coding, and effectively realize detecting and decoding by iterative manner because of its receiving terminal, not only reduced complexity but also improved systematic function greatly and become the focus of research.Particularly the TurboBLAST system of level code structure and vertical coding structure is easy to realize becoming the generally object of research because of it is simple in structure.With reference to Fig. 1, traditional Turbo coding V-BLAST system at first carries out the Turbo coding to signal, this Turbo coding comprises two component convolution coders, signal to be sent is through first component coder, 1 coding, signal to be sent after interweaving is through second component encoder 2 codings, code word behind the coding is a data flow through deleting surplus back parallel serial conversion, and conversion is diverted on the transmitting antenna of M road during by sky.The Turbo BLAST employing of vertical stratification is unified Turbo earlier and is encoded serial to parallel conversion to each antenna again, can obtain maximum diversity gain, as shown in Figure 4.The Turbo BLAST system of this vertical stratification receives structure, receiving terminal is after exporting the SISO detector through soft inputting and soft, inverse transformation obtains the soft information of the data flow of serial during by sky, deciphers and feeds back to detector afterwards by typical Turbo decoding unit and form iteration.This reception structure is because the processing mode of each antenna is identical so receiving terminal is difficult for the mode that the employing layering is handled when detecting, and difficult the detection.
With reference to Fig. 2, conversion was diverted on each antenna of M road when the existing level code structure Turbo BLAST H-BLAST of system carried out sky with data earlier, carried out the Turbo coding respectively at each antenna again, and is shown in Figure 5.This tradition H-BLAST system receives structure, behind the receiving terminal process SISO detector, at first the data flow that per minute is propped up is carried out the Turbo iterative decoding, the external information of decoding output feeds back to front end SISO detector in the iterative process, and inverse transformation becomes final demodulated information sequence when M way tool being flowed through sky after iteration is finished again.Because each antenna adopts absolute coding, the signal of receiving terminal is easy to the mode that adopts layering to detect, implements simple and flexible, but can not obtain maximum diversity gain, and systematic function depends on the performance of poor one deck.Overall performance is poorer than the Turbo BLAST system of vertical stratification.
Mostly existing lot of documents is to focus on and how to adopt lower complexity to realize iteration at receiving terminal studying based on existing level or vertical coding structure.The research of the relevant structure Design of making a start is fewer, so if can design the structure of making a start preferably, and cooperate corresponding iteration to receive structure, pass through co-design, advantage in conjunction with several existing systems then can improve the entire system performance, and makes that the scope of using is more extensive.
The content of invention
The objective of the invention is to overcome the deficiency of prior art, a kind of improved BLAST receive-transmit system is provided, the mode of handling with layering obtains maximum diversity gain, realizes the high speed data transfer of mimo wireless communication system.
The technical thought that realizes the object of the invention is: the advantage of H-BLAST system and V-BLAST system is combined; thought so as to the Turbo coding; promptly with reference to a kind of improved BLAST of the structural design of Turbo coding system; carry out absolute coding by Unified coding with on each antenna branch; to obtain bigger diversity gain and encoding scheme more flexibly, data on the different antennae are realized the protection of different brackets.
The present invention has its independent corresponding emission system structure and receiving system structure for the receive-transmit system that a M transmitting antenna N reception antenna arranged.
Described BLAST emission system, converter when comprising encoder, interleaver, parallel-to-serial converter, modulator, sky, wherein:
Transmitter carries out Unified coding x=encoder{u} by the Unified coding device with data u to be sent, and Unified coding also comprises information bit sequence x through the road codeword sequence x that deletes after surplus
sWith check bit sequence x
p
This one road codeword sequence x=encoder{u} during by sky converter be divided into the M group, every group comprises { x
S_i, x
P_i, i=1,2...M;
Every group information bit sequence x
S_iBy the code word c that exports after the branch road encoder encodes separately
iCheck bit sequence x with every group
P_iEnter parallel-to-serial converter simultaneously, be combined into one tunnel code word w
iOutput is transmitted into antenna by interleaver, modulator.Here the branch road encoder can be identical with the Unified coding device separately, also can be different, and the branch road encoder can be different mutually separately, carry out absolute coding.
Described BLAST receiving system, comprise soft inputting and soft output detector, decoder, interleaver, deinterleaver, parallel-to-serial converter, converter when empty, inverse transformer when empty, the soft inputting and soft output detector is divided into the signal that receives the bit external information of M road codeword sequence correspondence, be input to each road deinterleaver, export the bit branch road external information sequence L on each road
e M[w
i] i=1,2...M, wherein:
The branch road external information sequence L on every road
e M[w
i] tell the M road first external information sequence L through serial to parallel conversion
e M[x
P_i] and the second external information L
e M[c
i], this L
e M[x
P_i] be M road corresponding check bit sequence x
P_iThe external information sequence, L
e M[c
i] be the corresponding codeword sequence c in M road
iThe external information sequence;
The first external information sequence L on M road
e M[x
P_i] be combined into one road integrity checking bit external information sequence L after the inverse transformation when process is empty
e M[x
p] as total code word prior information of unifying decoder for decoding;
The second external information sequence L on M road
e M[c
i] and the prior information sequence L of each branch road
a D[x
S_i] input to each self-corresponding decoder simultaneously and carry out soft decoding;
Every road decoder output branch road decoding information bit external information L
e D[x
S_i] and branch road decoding check bit external information L
e D[c
i] two information, this L
e D[c
i] be transported to soft inputting and soft output detector, this L
e D[x
S_i] information during by sky inverse transformer become one tunnel total information bit prior information L
a D[u] is transported to unified decoder;
Unified decoder receives total code word prior information L
e M[x
p] and total information bit prior information L
a D[u] exports total feedback information bits external information L by soft decoding
e D[x
s] and total feedback code external information L
e D[x] information is more respectively with described L
e D[x
s] information and L
e D[x] feedback information arrives the input and the output of each branch road decoder, after the feedback number of times feedback of setting, and final output information bit soft information L
D[x
s], and the data sequence u that obtains estimating by judgement.
Above-mentioned receiving system, the wherein said second external information sequence L
e M[c
i] as the code word prior information of every road decoder for decoding, input to each self-corresponding decoder and carry out soft decoding.
Above-mentioned receiving system, the prior information sequence L of wherein said each branch road
a D[x
S_i] be total feedback information bits external information sequence L by unified decoder soft decoding output
e D[x
s] branch road prior information sequence when empty after the conversion.
Above-mentioned receiving system, wherein said branch road decoding check bit external information L
e D[c
i] be input to the soft inputting and soft output detector, be with this branch road decoding check bit external information L
e D[c
i] and the back grade check bit external information L of branch after the conversion when sky that unified decoder feeds back
e D[x
P_i], by being combined into one tunnel external information sequence L behind the parallel serial conversion
e D[w
i], feed back to the code word prior information of front end soft inputting and soft output detector through behind this branch road interleaver again as detector.
Above-mentioned receiving system, wherein said unified decoder is by total feedback code external information L of soft decoding output
e D[x] comprises total feedback check bit external information L
e D[x
p] and code word in the information bit external information L that obtains
e D[x
S_w], with total feedback check bit external information L
e D[x
p], conversion is divided into the check bit external information L of M road branch during by sky
e D[x
P_i], feed back to the output of each branch road decoder respectively.
Above-mentioned receiving system, total feedback information bits external information L of wherein said unified decoder output
e D[x
s], conversion is divided into M road branch road prior information sequence L during by sky
a D[x
S_i], feed back to the input of each branch road decoder.
The present invention has following advantage compared with prior art:
(1) the present invention owing to adopt combines existing V-BLAST system with the H-BLAST system, carries out Unified coding in Unified coding, thereby can have V-BLAST concurrently and obtain maximum diversity gain and H-BLAST realization flexible characteristic; Because adopting, the present invention on each antenna branch, carries out absolute coding simultaneously, so can make the detection of receiving terminal use the layering detection algorithm;
(2) the present invention compares the shortcoming that has overcome the low and receiving terminal iteration complexity of code check with existing simple Mixed cascading BLAST system, make the iterative manner of receiving terminal more flexible, promptly can under the good situation of channel condition, reduce the operand of iteration to taking different iterative manner between soft output detector and parallel independent decoder group and the unified decoder;
(3) emission system of the present invention has versatility, can combine with the combination of MIMO technology for self-adaptively transmitting and with existing MIMO-OFDM or MIMO-MC-CDMA system, realizes high speed data transfer.
Description of drawings
Fig. 1 is traditional V-BLAST emitting structural block diagram;
Fig. 2 is traditional H-BLAST emitting structural block diagram;
Fig. 3 is an emitting structural block diagram of the present invention;
Fig. 4 is traditional V-BLAST receiving system structured flowchart;
Fig. 5 is traditional H-BLAST receiving system structured flowchart;
Fig. 6 is a receiving system structured flowchart of the present invention;
Fig. 7 is that the present invention adopts BPSK when modulation and traditional B LAST receiver performance emulation comparison diagram;
Embodiment
Followingly technical scheme of the present invention is described in further detail with reference to accompanying drawing.
For convenience, present embodiment is set 8 transmitting antennas and 8 reception antennas, encoder is divided into 1 Unified coding device and 8 branch road encoders, this Unified coding device and branch road encoder can use grid codes such as convolution code or use Turbo code, the simplest systematic convolutional code that is to use in the convolution code.The iterations that receiving system detects decoding is set at 3.Real system can be selected different antenna number and iterations as required.
With reference to Fig. 3, it is x=encoder{u} that transmitter of the present invention at first carries out Unified coding by the Unified coding device to data u to be sent, this output code word x: comprise information bit x
sWith check bit x '
pThe code word that check bit is deleted after surplus is c, and this code word comprises { x
s, x
p.Code word conversion when empty of deleting after surplus is multiplexed on 8 antenna branch, to information bit sequence x
sWith check bit sequence x
pConversion when carrying out sky respectively, information bit sequence after the conversion and check bit sequence are expressed as x respectively
S_iAnd x
P_i, i=1,2..8.For each antenna branch i, information bit sequence x
S_iEncode output codeword sequence c by the branch road encoder
i, with this codeword sequence c
iWith check bit sequence x
S_iCarry out serial to parallel conversion, be combined into one road codeword sequence w
i, again by interweave and encode the mapping after finally launch from each antenna; The i.e. information bit sequence x of first antenna
S_1Encode output codeword sequence c by the first branch road encoder 1
1, with this codeword sequence c
1With check bit sequence x
P_1Carry out parallel serial conversion, be combined into one road codeword sequence w
1, successively by behind first interleaver and first modulator, launch again from first antenna; The information bit sequence x of second antenna
S_2Encode output codeword sequence c by the second branch road encoder 2
2, with this codeword sequence c
2With check bit sequence x
P_2Carry out parallel serial conversion, be combined into one road codeword sequence w
2, successively by behind second interleaver and second modulator, launch again from second antenna; The information bit sequence x of the 3rd antenna
S_3Encode output codeword sequence c by the 3rd branch road encoder 3
3, with this codeword sequence c
3With check bit sequence x
P_3Carry out parallel serial conversion, be combined into one road codeword sequence w
3, successively by behind the 3rd interleaver and the 3rd modulator, launch again from the 3rd antenna; The information bit sequence x of the 4th antenna
S_4Encode output codeword sequence c by the 4th branch road encoder 4
4, with this codeword sequence c
4With check bit sequence x
P_4Carry out parallel serial conversion, be combined into one road codeword sequence w
4, successively by behind the 4th interleaver and the 4th modulator, launch again from the 4th antenna; The information bit sequence x of the 5th antenna
S_5Encode output codeword sequence c by the 5th branch road encoder 5
5, with this codeword sequence c
5With check bit sequence x
P_5Carry out parallel serial conversion, be combined into one road codeword sequence w
5, successively by behind the 5th interleaver and the 5th modulator, launch again from the 5th antenna; The information bit sequence x of six roots of sensation antenna
S_6Encode output codeword sequence c by the 6th branch road encoder 6
6, with this codeword sequence c
6With check bit sequence x
P_6Carry out parallel serial conversion, be combined into one road codeword sequence w
6, successively by behind the 6th interleaver and the 6th modulator, launch again from six roots of sensation antenna; The information bit sequence x of the 7th antenna
S_7Encode output codeword sequence c by the 7th branch road encoder 7
7, with this codeword sequence c
7With check bit sequence x
P_7Carry out parallel serial conversion, be combined into one road codeword sequence w
7, successively by behind the 7th interleaver and the 7th modulator, launch again from the 7th antenna; The information bit sequence x of the 8th antenna
S_8Encode output codeword sequence c by the 8th branch road encoder 8
8, with this codeword sequence c
8With check bit sequence x
P_8Carry out parallel serial conversion, be combined into one road codeword sequence w
8, successively by behind the 8th interleaver and the 8th modulator, launch again from the 8th antenna.
With reference to Fig. 6, the structure of reception of the present invention is different from traditional V-BLAST and H-BLAST system.Need the multiplexing conversion of process earlier to the received signal, deliver to different cell processing through the multiplexing signal that separates.Be example with 8 reception antennas still, detailed process is:
(1) 8 tunnel external informations of front end SISO detector output are L
e M[w
i], i=1,2..8, each road external information sequence L
e M[w
i], at first the process serial to parallel conversion is divided into the second external information sequence L of corresponding branch road encoder
e M[c
i] and the first external information sequence L
e M[x
P_i], each road first external information sequence L
e M[x
P_i] more successively by deinterleaving and when empty inverse transformation merge into one road check bit external information sequence L
a D[x
p p], as total code word prior information of unified decoder.
(2) the second external information sequence L that exports by the front end parallel serial conversion on each branch road
e M[c
i] after deinterleaving, as the code word prior information L of branch road decoder soft decoding
a M[c
i].Branch road decoder on each branch road carries out soft decoding also needs information bit prior information L
a D[x
S_i], this prior information is by the total information bit external information sequence L of the unified decoder output of back level
e D[u] process is transformed to branch road external information sequence L when empty
a D[x
S_i] feed back to branch road decoder input.
External information sequence by feedback between (3) 8 branch road decoders and the unified decoder constitutes the iteration loop.When first iteration,, therefore think that initially branch road external information sequence is 0, specifically can be expressed as because unified decoder does not have feedback branch external information sequence:
The branch road decoder calculates the external information of corresponding bit according to coding structure:
In the formula: x
S_i, k, c
I, kRepresent sequence x respectively
S_iAnd c
iIn k bit, L
D[x
S_i, kC
I, k] the soft information of every bit in the sequence calculated for decoder, L
a D[x
S_i, k] be every bit prior information in the branch road information bit sequence, L
a D[c
I, k] be prior information by every bit in the code word external information sequence of prime SISO detector acquisition.
(4) each branch road decoder output branch road code word external information sequence L
e D[c
i] and branch road information bit external information sequence L
e D[x
S_i], this branch road code word external information sequence L
e D[c
i] and the back grade branch road code word prior information L that unified decoder feeds back after the conversion when sky
a D[x
P_i] through parallel serial conversion, again by behind the interleaver of this branch road as detector prior information sequence L
a M[w
i], feed back to front end SISO detector and form the iteration loop; The information bit external information L of 8 branch roads
e D[x
S_i] when empty conversion as the total information bit prior information sequence L of the unified decoder of back level
a D[u] promptly:
Conversion when T represents sky is an example with the simplest parallel serial conversion only here.
(5) unify decoder output total information bit external information L
e D[u] and total code word external information L
e D[x
p p], conversion is respectively with sequence L during through sky
e D[u] and L
e D[x
p p] become 8 the tunnel by one the tunnel after, feed back to branch road decoder input and branch road decoder output, respectively as the branch road information bit prior information sequence L of branch road decoder input
a D[x
S_i] and the branch road check bit prior information L of branch road decoder output
a D[x
P_i], form the iteration loop.
(6) according to upper type, corresponding external information can at first be transmitted between branch road decoder group and unified decoder, after the iteration 1 time the external information that obtains is fed back to front-end detector, constitutes another grade iteration loop, after the iteration 3 times to unified decoder output information bit soft information:
Through the final sequence u that detects of judgement output.
Technique effect of the present invention can describe in further detail by following emulation.
With reference to Fig. 7, the present invention to one 8 the 8 traditional mimo systems of receiving, adopts under the BPSK modulation and carries out emulation on the flat Rayleigh fading channel.The signal of receiving terminal can be expressed as,
Y＝HS+N
Wherein each element in the channel matrix H is separate multiple Gaussian random variable, S represents the signal phasor launched on 8 transmitting antennas, N is a noise vector, and wherein each element is separate multiple Gaussian random variable, and Y is the signal phasor that receiving terminal receives.Every of the system signal that antenna transmission is separate sends signal frame by frame in the emulation, 512 symbols of every frame.Iterations is set at 1 time between the decoder, and the iterations between decoder and the detector is set at 3 times.Average signal-to-noise ratio on every reception antenna changes to 3dB from-2dB, with the object as a comparison of the system's bit error rate under the different signal to noise ratios.Shown respectively among Fig. 7 that traditional V-BLAST system, H-BLAST system and system of the present invention are 1 time, 2 times, the 3 times errored bit performances under the situation at iterations between decoder and the detector, abscissa is represented signal to noise ratio snr, and ordinate is represented bit error rate BER.The curve of system of the present invention is represented with abbreviation TLBLAST in Fig. 7.Along with the raising of signal to noise ratio, the bit error rate of system diminishes as can be seen, and systematic function improves.The bit error rate curve of each system when carrying out 1 iteration in the comparison diagram 7, and 2 iteration, the bit error rate curve of each system during 3 iteration, also reaching under the situation of identical bit error rate as can be seen, signal to noise ratio required for the present invention will be lower than the required signal to noise ratio of traditional B LAST system, so the performance after the each iteration of the present invention is better than traditional B LAST system.Because the coding on each antenna of making a start in the emulation adopts identical coded system, therefore the performance of system of the present invention will further improve when the known channel information of making a start adopts adaptive coding.
English abbreviated expression explanation
The MIMO multiple-input and multiple-output
The output of SISO soft inputting and soft
Structure during the BLAST dblast
D-BLAST is to corner structure BLAST
T-BLAST helical structure BLAST
V-BLAST vertical stratification BLAST
H-BLAST horizontal structure BLAST
TLBLAST class Turbo structure BLAST
MIMO-OFDM multiple-input and multiple-output frequency division orthogonal multiplex
MIMO-MC-CDMA multiple input multiple output multicarrier code division multiple access
Claims (1)
1. BLAST receiving system, comprise soft inputting and soft output detector, decoder, interleaver, deinterleaver, deserializer, converter and inverse transformer when empty when empty, the soft inputting and soft output detector is divided into the signal that receives the bit external information of M road codeword sequence correspondence, be input to each road deinterleaver, export the bit branch road external information sequence L on each road
e M[w
i], i=1,2...M is characterized in that:
The branch road external information sequence on every road
Tell the first external information sequence respectively through serial to parallel conversion
With second external information
Should
Be the corresponding check bit sequence in M road
The external information sequence, L
e M[c
i] be the corresponding codeword sequence c in M road
iThe external information sequence;
The first external information sequence on M road
Be combined into one road integrity checking bit external information sequence after the inverse transformation during through sky
Total code word prior information as unified decoder for decoding;
The second external information sequence L on M road
e M[c
i] and the prior information sequence of each branch road
Input to each self-corresponding decoder simultaneously and carry out soft decoding, the prior information sequence of this each branch road
Be total feedback information bits external information sequence L by unified decoder soft decoding output
e D[x
s] branch road prior information sequence when empty after the conversion;
Every road decoder output branch road decoding information bit external information
With branch road decoding check bit external information
Two information, this branch road decoding check bit external information L
e D[c
i] and the back grade check bit external information L of branch after the conversion when sky that unified decoder feeds back
e D[x
P_i], by being combined into one tunnel external information sequence L behind the parallel serial conversion
e D[w
i], feed back to the code word prior information of front end soft inputting and soft output detector through behind this branch road interleaver again as detector, should
Information during by sky inverse transformer become one tunnel total information bit prior information
Be transported to unified decoder;
Unified decoder receives total code word prior information L
e M[x
p] and total information bit prior information L
a D[u], this unifies the total feedback code external information of decoder by soft decoding output
Comprise total feedback check bit external information L
e D[x
p] and code word in the information bit external information L that obtains
e D[x
S_w], with total feedback check bit external information
Conversion is divided into the check bit external information L of M road branch during by sky
e D[x
P_i], feed back to the output of each branch road decoder respectively;
Total feedback information bits external information L of unified decoder output
e D[x
s], conversion is divided into M road branch road prior information sequence L during by sky
a D[x
S_i], feed back to the input of each branch road decoder;
After the feedback number of times feedback of setting, final output information bit soft information L
D[x
s], and the data sequence that obtains estimating by judgement
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| CN101442389B (en) * | 2007-11-23 | 2013-02-13 | 华为技术有限公司 | Method and apparatus for sending and receiving multi-aerial system data |
| CN101764634A (en) * | 2008-11-04 | 2010-06-30 | 西安新邮通信设备有限公司 | Method and system for coding multi-system network Turbo code |
| CN102394722A (en) * | 2011-10-27 | 2012-03-28 | 优能通信科技（杭州）有限公司 | Soft decoding method of visual block product turbo code (VBPTC) in data management routine (DMR) under 4-frequency shift key (4FSK) modulation mode |
| CN103647623A (en) * | 2013-12-25 | 2014-03-19 | 南京航空航天大学 | Turbo-BLAST bi-iteration detection method |
| CN103944637A (en) * | 2014-05-13 | 2014-07-23 | 江苏理工学院 | Visible light communication transmission system and method |
| WO2023155116A1 (en) * | 2022-02-18 | 2023-08-24 | 华为技术有限公司 | Signal sending method and apparatus |
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Non-Patent Citations (2)
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| MIMO***中分层结构的空时分组码. 朱瑜，张海林，刘耀宇.山西电子技术，第1期. 2007 |
| MIMO***中分层结构的空时分组码. 朱瑜，张海林，刘耀宇.山西电子技术，第1期. 2007 * |
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