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应用科学学报 ›› 2011, Vol. 29 ›› Issue (6): 551-558.doi: 10.3969/j.issn.0255-8297.2011.06.001

• 通信工程 •    下一篇

原模图LDPC码的一种联合优化算法

方毅1， 王琳1， 陈平平2， 肖旻1   

  1. 1. 厦门大学通信工程系，福建厦门361005
    2. 厦门大学电子工程系，福建厦门361005
  • 收稿日期:2011-01-04 修回日期:2011-03-29 出版日期:2011-11-30 发布日期:2011-11-29
  • 通信作者: 方毅，博士生，研究方向：信道纠错编码与信息论，E-mail: fangyi1986812@163.com；王琳，教授，博导，研究方向：通信物理层算法设计分析与实现，E-mail: wanglin@xmu.edu.cn
  • 作者简介:方毅，博士生，研究方向：信道纠错编码与信息论，E-mail: fangyi1986812@163.com；王琳，教授，博导，研究方向：通信物理层算法设计分析与实现，E-mail: wanglin@xmu.edu.cn
  • 基金资助:

    基金项目：国家自然科学基金（No.60972053, No.61001073）资助

Joint Optimization Algorithm for Protograph LDPC Codes

FANG Yi1, WANG Lin1, CHEN Ping-ping2, XIAO Min1   

  1. 1. Department of Communication Engineering, Xiamen University, Xiamen 361005, Fujian Province, China
    2. Department of Electronic Engineering, Xiamen University, Xiamen 361005, Fujian Province, China
  • Received:2011-01-04 Revised:2011-03-29 Online:2011-11-30 Published:2011-11-29
  • About author:方毅，博士生，研究方向：信道纠错编码与信息论，E-mail: fangyi1986812@163.com；王琳，教授，博导，研究方向：通信物理层算法设计分析与实现，E-mail: wanglin@xmu.edu.cn

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被引次数

2

摘要：

根据深空通信的特点及需求，JPL实验室提出了性能比常规奇偶校验码更优的原模图低密度奇偶校验码，即原模图LDPC(low-density parity-check)码. 该文提出一种原模图LDPC码的联合优化算法，在不增加编译码复杂度的前提下能兼顾瀑布区性能，设计出地板区性能更好的码型. 理论分析和仿真结果表明，用该算法设计出的新型重复积累码与新型重复-积累-重复码与传统码型（重复积累码和AR4JA码）相比，可在高信噪比区域获得显著的编码增益，降低了错误地板.

关键词: 原模图LDPC码, 优化算法, 编码增益, 误码率, 错误地板

Abstract:

According to the requirements and characteristic of space communication, protograph low-density parity-check (LDPC) codes have been proposed by Jet Propulsion Laboratory (JPL), which have better performance than conventional LDPC codes. In this paper, we propose a joint optimization algorithm for protograph LDPC codes, aiming at lowering the error floor of protograph LDPC codes, while maintaining good perfor ance at waterfall region without increasing encoding and decoding complexity. Theoretical analysis and simulation indicate that the repeat accumulate (RA) and accumulate repeat accumulate (ARA) codes designed by using the proposed algorithm have a remarkable coding-gain, and a lower error floor, as compared with the conventional RA and accumulated repeat by-4-jagged accumulate (AR4JA) codes at the high SNR region.

Key words: protograph low-density parity-check codes, optimization algorithm, coding gain, bit error rate, error floor

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