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LDPC码编码的DP-HARQ协议多层译码算法及性能分析

王 芳1， 程时昕1， 陈 明1，王海峰2   

  1. 1 东南大学移动通信国家重点实验室，江苏 南京 210096；
    2 TP Oulu, NOKIA, Oulu, Finland 90570
  • 收稿日期:2006-10-13 修回日期:2007-04-29 出版日期:2007-07-30 发布日期:2007-07-30

Multi-level Decoding of DP-HARQ Proticol with LDPC Coding and Performance Evaluation

WANG Fang1, CHENG Shi-xin1,CHEN Ming,WANG Hai-feng2

  

  1. 1.National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China;

    2.TP Oulu,NOKIA,Oulu 90570,Finland

  • Received:2006-10-13 Revised:2007-04-29 Online:2007-07-30 Published:2007-07-30

摘要： 针对数据打孔的II型HARQ协议提出了一种多层译码算法。与传统的两层译码算法相比，多层译码算法充分利用了重传码字的纠错能力，能够提高系统吞吐量。该文描述了如何利用密度演进算法分析LDPC编码的、采用多层译码算法的DP-HARQ协议的性能，分析和数值仿真结果表明，如果选择恰当的打孔率，在低信噪比范围内，多层译码算法可以明显提高系统的吞吐量。

关键词: 数据打孔的混合自动重传请求协议, 低密度奇偶校验码, 多层译码, 密度演进

Abstract: A novel decoding algorithm, multi-level decoding, for data puncturing type-II hybrid-ARQ protocol is proposed in this paper. Compared to the conventional two-level decoding, the proposed algorithm makes full use of error-correcting capability of each punctured codeword to improve the system performance. Performance evaluation for the multi-level decoding algorithm with density evolution is made. Analysis and numerical simulation results show that, if a proper puncturing rate is chosen, the multi-level decoding algorithm can improve the throughput performance by a few tenths of a decibel at lower SNR.

Key words: DP-HARQ, LDPC codes, multi-level decoding, density evolution