可分解的RC-LDPC码以及HARQ的设计

沈进旗; 徐友云; 俞晖; 甘小莺

doi:10.3724/SP.J.1146.2008.00047

可分解的RC-LDPC码以及HARQ的设计

doi: 10.3724/SP.J.1146.2008.00047

基金项目:

国家自然科学基金重点项目(60332030)，国家863计划项目(2007AA01Z237)和上海市科学技术委员会(05DZ22102)资助课题

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出版历程
- 收稿日期: 2008-01-11
- 修回日期: 2008-06-10
- 刊出日期: 2009-04-19

Design of Decomposable-Rate-Compatible LDPC Codes and HARQ Scheme

摘要

摘要: 该文提出了一种可分解的码率兼容LDPC码的构造方法, 该方法构造所得到的一个高码率LDPC码的校验矩阵中包含有若干低码率LDPC码的校验矩阵，而且一个高码率的LDPC码又可以分解成多个性能优异的低码率的LDPC码进行编译码；结合该特性设计了一种基于可分解的码率兼容LDPC码的混合自动重传方案。与普通的ARQ方案相比，该重传方案不单能够通过重传获得更多的信息，而且能够通过降低纠错码的码率来提高纠错码的性能。仿真结果表明，当所采用LDPC码的码长为2000左右，码率为1/2和2/3时，与一般的ARQ相比，该方案的误帧率以及吞吐量(小于0.5的时候)均能获得近1.5dB的增益。
- 低密度校验码;可分解;可变码率;边增长;混合自动重传
Abstract: A novel method is proposed to construct Decomposable-Rate-Compatible LDPC (D-RC-LDPC) codes. The H matrix of a high rate LDPC codes constructed by this method contains a series of LDPC codes with low rate. The low rate codes can be encoded and decoded respectively which make the system more flexible. A new HARQ scheme based on D-RC-LDPC is also proposed, which is called DB-HARQ (D-RC-LDPC Based HARQ). It can transmit more information through re-transmit scheme and improve the performance of Error Correction Code (ECC) by lowering rate of the ECC. The scheme can improve the FER and throughput performance with 1.5 dB compared with normal ARQ scheme when the code length of is about 2000 and the code rate is 1/2 to 2/3.

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参考文献(1)

Tian T, Jones C, and Villasenor J D. Rate-compatiblelow-density parity-check code. International Symposium onInformation Theory, Chicago, 2004: 152.[2]Yoichi I, Tomonori S, and Tomoaki O. Reliability-BasedHybrid ARQ (RB-HARQ) schemes using Low-Density Parity-Check (LDPC) codes. Global Telecommunications Conference,GLOBECOM '06. IEEE, San Francisco, 2006: 1-5.[3]Cao Y, Gu J, and Qi L, et al.. Degree distribution based HARQfor irregular LDPC[J].Electronics Letters.2006, 42(6):363-364[4]Jia Minli, He Zunwen, and Kuang Jingming. EnhancedHARQ schemes based on LDPC coded irregular modulation.Microwave, Antenna, Propagation and EMC Technologiesfor Wireless Communications, 2007 International Symposiumon, Hangzhou, 2007: 1088-1092.[5]Bi D and Perez L C. Rate-compatible low-densityparity-check codes with rate-compatible degree profiles.Electronics Letters, 2006, 42(1): 41-43.[6]Gao Zhenyuan, Fei Zesong, and Kuang Jingming, et al..Rate-compatible schemes for link adapted LDPC codes inIEEE 802.16e standard. Vehicular Technology Conference,2007. VTC2007-Spring. Dublin, 2007: 3155-3159.[7]Shi Zhiping and Zhou Liang. A combining decoding methodof LDPC codes for HARQ. Future GenerationCommunication and Networking, Jeju, 2007: 248-251.[8]Jiang Ming, Zhao Chunming, and Liu Zhanli, et al.. AnImproved Construction of LDPC Codes Based on DataPunctured Hybrid ARQ. ICCCAS, Guilin, 2006: 25-28.[9]Hu XiaoYu, Eleftheriou E, and Arnold D M. Progressiveedge-growth Tanner graphs. GLOBECOM '01. IEEE, SanAntonio, 2001: 995-1001.

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