CN101242247A - Mixed automatic retransfer system for decomposable code rate compatible to low density checkup code - Google Patents
Mixed automatic retransfer system for decomposable code rate compatible to low density checkup code Download PDFInfo
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Abstract
The invention discloses a hybrid retransfer system for decomposable code rate compatible with a low density check code in the wireless communication technology field, wherein: the channel coding module produces an initial check digit and a retransfer check digit, the channel coding module coding outputs the information source decision value and the soft information of information bit and check digit after cording update based on the initial channel information obtained by the channel coding module or a soft information recovered from a retransfer and soft information combination recover module which takes charge of response retransfer request, and, a soft information for coding a low density check code can be combined or recovered based on the soft information after the initial coding update of the channel coding module and the soft information after the first coding update after retransfer, and the module calculates the decision value of the initial information source check digit based on the decision value of two-time coding output after retransfer. The invention improves the error correcting capability of the system, increases the throughput of the system.
Description
Technical field
The present invention relates to a kind of system of wireless communication technology field, specifically, what relate to is a kind of mixed automatic retransfer system of decomposable code rate compatible to low density checkup code.
Background technology
Along with people are increasing to the demand of high-speed data service, people's attention is more and more received in the research that mixes automatic repeat requests (HARQ) as one of basic technology of high speed data transfer.The performance of the error correcting code that is adopted in the automatic re-transmission of mixing (HARQ system) has bigger influence to the performance of this system.Therefore select a kind of suitable error correcting code particularly important.
LDPC sign indicating number (loe-density parity-check code) is proposed in 1963 by Gallager, and it is a kind of error correction/detection technology that can be used as plurality of communication systems or information storage system.Because the LDPC sign indicating number has the performance of approaching the channel limit, it becomes one of hot technology of greatest concern over past ten years.The LDPC sign indicating number is compared with traditional chnnel coding has obvious superiority, compares with Turbo code commonly used, and decoding complexity had reduced many when performance was approaching.Recent years, the LDPC channel coding technology has been widely used in various broadband data communications application scenario from wired to wireless because of its remarkable performance: in cellular mobile communication, the LDPC sign indicating number has been chosen as the chnnel coding standard of digital television broadcasting DVB-T; Wideband satellite communication, wireless personal-area network (802.15), wireless mobile wideband access network (802.20) and other also have been considered as it one of chnnel coding standard as visit of data storage media device and communication systems such as wire line MODEM (Cable Modem), DSL.
Adopt the LDPC sign indicating number of cbr (constant bit rate) can obtain bigger coding gain.Therefore the HARQ scheme of LDPC sign indicating number has been subjected to paying close attention to widely in the past few years, particularly is based upon the II type HARQ on the LDPC sign indicating number basis of code-rate-compatible.For more effective realization retransmits, people begin to have constructed some and be very suitable for the LDPC sign indicating number of the code-rate-compatible of HARQ system from the structure of research LDPC sign indicating number.
Common ARQ system just obtains extra channel initial information by retransmitting, thereby increases the possibility of correct decoding.Automatic re-transmission can the code check of error correcting code be with the error-correcting performance of enhanced system in the reduction system when obtaining extra channel initial information and mix, and these two factors act on simultaneously and can further improve systematic function.Yet, at present in the code-rate-compatible LDPC codes that is adopted in the HARQ system high code check the performance of LDPC sign indicating number of compatible low code check all do not reach optimum, therefore reduced the performance of system.
Find through literature search prior art, Ming Jiang, Chunming Zhao, Zhanli Liu etc. are at ICCCAS, 2006, delivered " An Improved Construction of LDPC CodesBased on Data Punctured Hybrid ARQ " (telecommunication circuit and system's international conference on the 2:25-28,2006 the 2nd volumes, the 25-28 page or leaf, the improved LDPC sign indicating number structural scheme of a kind of data punching HARQ), the partial information of check information after the mixing retransmission system utilization of being adopted in the literary composition retransmits and transmission last time is combined into the LDPC sign indicating number of low code check and deciphers to upgrade the information of part of nodes, and then carry out secondary with the information after upgrading and decipher, can obtain bigger gain like this; Yet the code-rate-compatible LDPC codes that is adopted in this system the performance of LDPC sign indicating number of compatible low code check do not reach optimum, and the decoding employing second time after retransmitting is the LDPC sign indicating number of high code check, its error-correcting performance is not as the LDPC sign indicating number of low code check, so the performance of whole system is still waiting further raising.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of mixed automatic retransfer system of decomposable code rate compatible to low density checkup code is provided, with the performance of the LDPC that improves in the such scheme compatible low code check, the code check that reaches optimum performance and reduce decoding for the second time is to strengthen error-correcting performance.
The present invention is achieved by the following technical solutions, comprises channel coding module, channel decoding module, re-transmission and soft information combination recovery module.Channel coding module produces the check digit that initial check bit sum retransmits; The channel decoding module is deciphered the soft information after corresponding information source decision value of output and information bit and check digit are deciphered renewal according to the initial channel information of channel coding module acquisition or the soft information of recovering from re-transmission and soft information combination recovery module; Retransmit with soft information combination and recover the mainly responsible response repeat requests of module, soft information after upgrading according to channel decoding module Initial Decoding and retransmit after the decoding first time after upgrading soft information combination or recover the soft information that is used for low code rate LDPC code decoding, this module is responsible for calculating according to the decision value of the check digit of the twice decoding output after retransmitting the decision value of initial information source check digit simultaneously.
For the second time deciphering three submodules after described channel decoding module is deciphered for the first time, retransmitted by Initial Decoding, re-transmission back forms.Wherein the Initial Decoding submodule is responsible for utilizing the LDPC sign indicating number of high code check that the initial information that receives from channel is deciphered; Retransmitting the back deciphers the initial information of the LDPC sign indicating number of the low code check after the decomposition that the soft information combination of the check digit of the soft information of the information bit after submodule is responsible for upgrading according to Initial Decoding and re-transmission obtains for the first time and deciphers; Decipher for the second time submodule after retransmitting and be responsible for according to the soft information by the information bit after the Initial Decoding renewal, the initial information of the LDPC sign indicating number of another the low code check after the soft information resulting decomposition of the check digit after decipher for the first time the soft information of the check digit after Initial Decoding is upgraded and re-transmission back is deciphered.
The main feature of described channel coding module, channel decoding module is to have adopted decomposable code rate compatible to low density checkup code, and re-transmission then is to have adopted the HARQ method of decomposable code rate compatible to low density checkup code and utilized the relation of parity check to carry out the method that soft information is recovered with the main feature that soft information combination is recovered module.
The decomposable code rate compatible to low density checkup code that is adopted in the channel decoding module of the present invention has following feature: the check matrix of the subcode of each code check in the decomposable code-rate-compatible LDPC codes of 1. being constructed has identical full rank check block P; Each block of information S of 2. public check block P and expansion
i, the row of 1≤i≤n is rearranged the heavy λ that all is fixed as; 3. the degree of LDPC sign indicating number of compatible each code check distribute to all having passed through optimization, therefore each compatible code rate LDPC code have identical performance with the low code rate LDPC code of constructing separately.4. one is R by code check
nDecomposable code rate compatible LDPC codes can to resolve into a code check be R
N-1LDPC sign indicating number and code check be 1/2 LDPC sign indicating number, there is following relation in the check digit between them:
Wherein
The expression information source
Through the check digit behind the LDPC sign indicating number coding of 1/2 code check that decomposition;
The expression information source
Passing through the code check that is decomposed is R
N-1LDPC sign indicating number coding after check digit.The decomposable code rate compatible to low density checkup code that employing has an above-mentioned feature solved in the HARQ system error correcting code the optimization problem of performance under compatible each code check.
Described re-transmission and soft information combination are recovered module, when the Initial Decoding mistake, the check digit of one 1/2 code rate LDPC code after retransmit decomposing, the soft information after receiving end can be upgraded itself and Initial Decoding like this merge the LDPC sign indicating number of forming one 1/2 code check and retransmit the back and decipher the first time.
Described re-transmission and soft information combination are recovered module, retransmit the back code check of decoding for the second time in order to reduce, and this module utilizes code check to be R
1The LDPC sign indicating number and LDPC sign indicating number and code check of its one 1/2 code check decomposing out be R
N-1The check digit of LDPC sign indicating number between the parity check relation to recover code check be R
N-1The soft information of check digit of LDPC sign indicating number, and with its with retransmit the back decoding upgraded for the first time after the soft information of information bit merge, the employing code check is R
N-1The LDPC sign indicating number decipher.
Compared with prior art, in the system of the present invention the employing of decomposable code rate compatible to low density checkup code solved in the HARQ system error correcting code the optimization problem of performance under compatible each code check.Retransmitting the processing that recovers module with soft information combination makes the secondary decoding code check after retransmitting in the HARQ system be minimized.More than 2 technological improvements make the error correcting capability of the error correcting code in the system be improved, thereby further improved the performance of system.Simulation result shows, adopting about 2000 code length initial bit rate is this HARQ system and the gain of the about 2.0dB of specific energy acquisition mutually of common ARQ system that 2/3 error correcting code realizes, thereby can improve the throughput of system.Along with people further improve the requirement of data speed, this system will have and use prospect preferably.
Description of drawings
Fig. 1 is the structure chart of the HARQ system of the decomposable compatible code rate LDPC code invented.
Fig. 2 is the H matrix structure schematic diagram of the decomposable compatible code rate LDPC code that the present invention constructed.
The serve as reasons H matrix decomposition of high code check of Fig. 3 becomes the schematic diagram of two low code check matrixes.
Fig. 4 is the performance comparison curves of example code and sign indicating number that is decomposed and the sign indicating number that adopts the PEG algorithm construction
Fig. 5 is institute's invention scheme and other scheme frame error rate performance curve of example code for error correcting code.
Fig. 6 is the institute's invention scheme of example code and the comparison curves of other scheme throughput for error correcting code.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises three modules: channel coding module, channel decoding module, re-transmission and soft information combination are recovered module.Channel coding module produces the check digit that initial check bit sum retransmits, the channel decoding module is deciphered the soft information after corresponding information source decision value of output and information bit and check digit are deciphered renewal according to the initial channel information of channel coding module acquisition or the soft information of recovering from re-transmission and soft information combination recovery module.Retransmit with soft information combination and recover the mainly responsible response repeat requests of module, soft information after upgrading according to channel decoding module Initial Decoding and retransmit after the decoding first time after upgrading soft information combination or recover the soft information that is used for low code check loe-density parity-check code decoding, this module is responsible for calculating according to the decision value of the check digit of the twice decoding output after retransmitting the decision value of initial information source check digit simultaneously.
For the second time deciphering three submodules after described channel decoding module is deciphered for the first time, retransmitted by Initial Decoding, re-transmission back forms. wherein Initial Decoding submodule are responsible for utilizing the LDPC code of high code check that the initial information that receives from channel is deciphered; Decipher for the first time submodule after retransmitting and be responsible for the initial information of the LDPC code of the low code check after the decomposition that the soft information combination according to the check bit of the soft information of the information bit after being upgraded by Initial Decoding and re-transmission obtains and decipher, decipher the soft information of the information bit after submodule is responsible for upgrading according to Initial Decoding after retransmitting for the second time and upgrade from Initial Decoding after check bit soft information and retransmit after the initial information of LDPC code of another low code check after the decomposition that obtains of the soft information of check bit after for the first time decoding decipher.
In the present embodiment, the check matrix of the subcode of each code check in the decomposable code-rate-compatible LDPC codes that described channel coding module is constructed has identical full rank check block P; Each block of information S of public check block P and expansion
i, the row of 1≤i≤n is rearranged the heavy λ that all is fixed as; The degree of LDPC sign indicating number of compatible each code check distribute to all having passed through optimization, therefore each compatible code rate LDPC code have identical performance with the low code rate LDPC code of constructing separately.One is R by code check
nDecomposable code rate compatible LDPC codes can to resolve into a code check be R
N-1LDPC sign indicating number and code check be 1/2 LDPC sign indicating number.There is following relation in check digit between them:
Wherein
The expression information source
Through the check digit behind the LDPC sign indicating number coding of 1/2 code check that decomposition.
The expression information source
Passing through the code check that is decomposed is R
N-1LDPC sign indicating number coding after check digit.
As shown in Figure 2, the H matrix H of the decomposable code rate compatible LDPC codes that channel coding module adopts in the present embodiment
2By the check block P of a full rank with two row are heavy and column weight all is that the block of information of λ=3 is formed.
As shown in Figure 3, in the channel coding module, code check is R in the present embodiment
nThe H matrix H of=2/3 decomposable code rate compatible LDPC codes
2Can resolve into a code check is R
N-1The check matrix H of=1/2 LDPC sign indicating number
1With a code check be the check matrix H of 1/2 LDPC sign indicating number
1/2,2, and they have common check block P.So the relation between the check digit of above-mentioned three LDPC sign indicating numbers satisfies:
Wherein
Expression utilizes H
2To information source
The check digit of encoding and obtaining,
Expression utilizes H
1To information source
The check digit that obtains of encoding,
Expression utilizes H
1/2,2To information source
The check digit that obtains of encoding.
For the described check digit of Fig. 2 is the example code of 1024 bits, and modulation system, awgn channel, the LDPC decoding algorithm that adopts BPSK is that BP algorithm, maximum iteration time are that 100 model is to having carried out emulation to it.
Fig. 4 is the example code that adopted in the embodiment of the invention comparison curves with the frame error rate performance of the LDPC sign indicating number of the identical parameters that adopts common PEG algorithm construction.The performance of the pairing LDPC sign indicating number of each H matrix in the decomposable code-rate-compatible LDPC of as can be seen from the figure being constructed equates with the performance of the LDPC sign indicating number of the identical code length that adopts the PEG structure, same code rate, so this building method can not bring any performance loss.As seen this technology can make error correcting code in the HARQ system under compatible each code check the performance of LDPC sign indicating number all obtain optimization.
Retransmitting the information that retransmits with soft information combination recovery module is check digit
The decoding back utilizes for the first time
Soft information after the renewal
And the soft information after the Initial Decoding renewal
Recover the soft information that is verified as of the decoder of 1/2 code check that adopts for the second time
, the soft information after itself and Initial Decoding upgraded
Merge the LDPC sign indicating number that promptly can adopt 1/2 code check and carry out the decoding second time.This makes the code check of twice decoding after retransmitting all reduce to 1/2, has strengthened the error-correcting performance of system greatly.
Fig. 5 is that what invented is the HARQ system of error correcting code with the example code and the frame error rate performance comparison curves that does not adopt retransmission protocol and adopt common ARQ scheme.As can be seen from the figure: the frame error rate performance that adopts system of the present invention, do not adopt retransmission mechanism to compare, can obtain the gain of about 2dB, compare with common ARQ retransmission mechanism, be the performance improvement that also can obtain 1.5dB under 1/3 the situation of common ARQ data retransmission amount in the data volume that retransmits.
Fig. 6 is the throughput performance comparison curves of the pairing system of Fig. 5.As can be seen from the figure: the HARQ system of being invented can significantly improve the throughput of system in detail with common ARQ scheme when throughput is less than 0.5.
Claims (8)
1, a kind of mixed automatic retransfer system of decomposable code rate compatible to low density checkup code, it is characterized in that, comprise channel coding module, the channel decoding module, retransmit with soft information combination and recover module, described channel coding module produces the check digit that initial check bit sum retransmits, initial channel information or the soft information after the soft information that re-transmission and soft information combination recover to recover the module is deciphered the corresponding information source decision value of output and information bit and check digit decoding renewal that described channel decoding module obtains according to channel coding module, described re-transmission and soft information combination are recovered module and mainly are responsible for the response repeat requests, soft information after upgrading according to channel decoding module Initial Decoding and retransmit after the decoding first time after upgrading soft information combination or recover the soft information that is used for low code check loe-density parity-check code decoding, this module is responsible for calculating according to the decision value of the check digit of the twice decoding output after retransmitting the decision value of initial information source check digit simultaneously.
2, the mixed automatic retransfer system of decomposable code rate compatible to low density checkup code according to claim 1, it is characterized in that, described channel decoding module is by Initial Decoding, retransmit back decoding for the first time, retransmit the back and decipher three submodules compositions for the second time, wherein the Initial Decoding submodule is responsible for utilizing the loe-density parity-check code of high code check that the initial information that receives from channel is deciphered, retransmit the back and decipher the initial information of the loe-density parity-check code of the low code check after the decomposition that the soft information combination of the check digit of the soft information of the information bit after submodule is responsible for upgrading according to Initial Decoding and re-transmission obtains for the first time and decipher, retransmit that the back is deciphered the soft information of the information bit after submodule is responsible for upgrading according to Initial Decoding for the second time and upgrade from Initial Decoding after check digit soft information and retransmit back decoding for the first time after the decomposition that obtains of the soft information of check digit after the initial information of loe-density parity-check code of another low code check decipher.
3, the mixed automatic retransfer system of decomposable code rate compatible to low density checkup code according to claim 1, it is characterized in that, described channel decoding module, in its decomposable code rate compatible to low density checkup code that adopts, the check matrix of the subcode of each code check has identical full rank check block P.
4, according to the mixed automatic retransfer system of claim 1 or 3 described decomposable code rate compatible to low density checkup code, it is characterized in that, described channel decoding module, in the decomposable code rate compatible to low density checkup code that it adopted, each block of information S of public check block P and expansion
i, the row of 1≤i≤n is rearranged the heavy λ that all is fixed as.
5, according to the mixed automatic retransfer system of claim 1 or 3 described decomposable code rate compatible to low density checkup code, it is characterized in that, described channel decoding module, in the decomposable code rate compatible to low density checkup code that it adopted, compatible each code check loe-density parity-check code have identical performance with the low code check loe-density parity-check code of structure separately.
6, according to the mixed automatic retransfer system of claim 1 or 3 described decomposable code rate compatible to low density checkup code, it is characterized in that, described channel decoding module, in the decomposable code rate compatible to low density checkup code that it adopted, one is R by code check
nDecomposable code rate compatible to low density checkup code to resolve into a code check be R
N-1Loe-density parity-check code and code check be 1/2 loe-density parity-check code, there is following relation in the check digit between them:
Wherein
The expression information source
Through the check digit behind the low density check code of 1/2 code check that decomposition,
The expression information source
Passing through the code check that is decomposed is R
N-1Low density check code after check digit.
7, the mixed automatic retransfer system of decomposable code rate compatible to low density checkup code according to claim 1, it is characterized in that, described re-transmission and soft information combination are recovered module, when the Initial Decoding mistake, the check digit of one 1/2 code check loe-density parity-check code after retransmit decomposing, the soft information after receiving end can be upgraded itself and Initial Decoding like this merge the loe-density parity-check code of forming one 1/2 code check and retransmit the back and decipher the first time.
According to the mixed automatic retransfer system of claim 1 or 7 described decomposable code rate compatible to low density checkup code, it is characterized in that 8, described re-transmission and soft information combination are recovered module, utilize code check to be R
nLoe-density parity-check code and loe-density parity-check code and code check of its one 1/2 code check decomposing out be R
N-1The check digit of loe-density parity-check code between the parity check relation to recover code check be R
N-1The soft information of check digit of loe-density parity-check code, and with its with retransmit the back decoding upgraded for the first time after the soft information of information bit merge, the employing code check is R
N-1Loe-density parity-check code decipher.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102394726A (en) * | 2011-08-16 | 2012-03-28 | 上海交通大学 | Serial cascade coding and quasi-coherent iteration decoding method of GMSK signal |
| CN101621367B (en) * | 2009-06-09 | 2012-11-14 | 华中科技大学 | HARQ decoding method based on packet check information |
| WO2017214851A1 (en) * | 2016-06-14 | 2017-12-21 | 华为技术有限公司 | Signal transfer method, transmitting terminal, and receiving terminal |
| CN110268786A (en) * | 2017-02-07 | 2019-09-20 | 三星电子株式会社 | The method and apparatus of control and data information are sent in radio honeycomb communication system |
| CN114915380A (en) * | 2022-07-19 | 2022-08-16 | 中国科学院宁波材料技术与工程研究所 | CAN bus-based low-cost high-real-time automatic error correction communication system and method |
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| EP1677450A3 (en) * | 2004-12-31 | 2008-09-24 | Samsung Electronics Co., Ltd. | HARQ apparatus and method using an LDPC code |
| CN101034953B (en) * | 2006-03-06 | 2010-06-23 | 诺基亚西门子通信系统技术（北京）有限公司 | Method for carrying out data transmission using the low-density parity check code |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101621367B (en) * | 2009-06-09 | 2012-11-14 | 华中科技大学 | HARQ decoding method based on packet check information |
| CN102394726A (en) * | 2011-08-16 | 2012-03-28 | 上海交通大学 | Serial cascade coding and quasi-coherent iteration decoding method of GMSK signal |
| CN102394726B (en) * | 2011-08-16 | 2015-05-20 | 上海交通大学 | Serial cascade coding and quasi-coherent iteration decoding method of GMSK signal |
| WO2017214851A1 (en) * | 2016-06-14 | 2017-12-21 | 华为技术有限公司 | Signal transfer method, transmitting terminal, and receiving terminal |
| CN110268786A (en) * | 2017-02-07 | 2019-09-20 | 三星电子株式会社 | The method and apparatus of control and data information are sent in radio honeycomb communication system |
| CN110268786B (en) * | 2017-02-07 | 2023-05-12 | 三星电子株式会社 | Method and apparatus for transmitting control and data information in a wireless cellular communication system |
| US11924849B2 (en) | 2017-02-07 | 2024-03-05 | Samsung Electronics Co., Ltd | Method and apparatus for transmitting control and data information in wireless cellular communication system |
| CN114915380A (en) * | 2022-07-19 | 2022-08-16 | 中国科学院宁波材料技术与工程研究所 | CAN bus-based low-cost high-real-time automatic error correction communication system and method |
| CN114915380B (en) * | 2022-07-19 | 2022-09-30 | 中国科学院宁波材料技术与工程研究所 | CAN bus-based low-cost high-real-time automatic error correction communication system and method |
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