光通信系统中QC-LDPC码的新颖构造方法

doi:10.13190/jbupt.201303.21.yuanjg

北京邮电大学学报 ›› 2013, Vol. 36 ›› Issue (3): 20-24.doi: 10.13190/jbupt.201303.21.yuanjg

光通信系统中QC-LDPC码的新颖构造方法

袁建国, 刘文龙, 黄胜, 王永

重庆邮电大学光纤通信技术重点实验室, 重庆 400065

收稿日期:2012-07-20 出版日期:2013-06-30 发布日期:2013-06-30
作者简介:袁建国(1968—), 男, 教授, 博士, E-mail:yuanjg@cqupt.edu.cn.
基金资助:
国家自然科学基金项目(61071117, 61003256); 重庆市自然科学基金项目(2010BB2409); 重庆市教委项目(KJ110519)

Construction Method of QC-LDPC Codes in Optical Communication Systems

YUAN Jian-guo, LIU Wen-long, HUANG Sheng, WANG Yong

Key Laboratory of Optical Fiber Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Received:2012-07-20 Online:2013-06-30 Published:2013-06-30

摘要/Abstract

摘要：

基于Richardson-Urbanke算法校验矩阵的结构,提出了一种适合光通信系统的具有更低编码复杂度的准循环低密度奇偶校验(QC-LDPC)码的构造方法,构造出码率高达93.7%的QC-LDPC(4288,4020)码. 仿真结果表明,在误码率为10^-7时,与广泛应用于光通信系统中的经典RS(255,239)码相比,QC-LDPC码可获得约1.7 dB的净编码增益,并比SCG-LDPC(3969,3720)码的净编码增益提高了约0.3 dB,距离香农限约1.3 dB,并低于随机构造的列重为3的LDPC(4288,4020)码的错误平层.

关键词: 光通信系统, 准循环低密度奇偶校验码, 误码率, 净编码增益

Abstract:

To meet the increasing requirement on the transmission characteristics of optical communication systems, based on the structure of parity-check matrix of Richardson-Urbanke algorithm, a lower-complexity constructing method is proposed for the quasi-cyclic low-density parity-check (QC-LDPC) codes in the optical communication systems, and a QC-LDPC(4288,4020) code with 93.7% higher code-rate is also constructed. Simulation shows that the constructed QC-LDPC(4288,4020) code has net coding gain of about 1.7 dB over the classic RS(255,239) code which has been widely used for optical communication systems and 0.3 dB more than that of SCG-LDPC(3969,3720) code with the same 93.7% higher code-rate, and the NCG of the QC-LDPC(4288,4020) code is about 1.3 dB away from the Shannon limit at bit error rate BER of 10^-7; furthermore, the error floor of QC-LDPC(4288,4020) code is lower than that of the randomly constructed LDPC(4288,4020) with the column weight of 3.

Key words: optical communication system, quasi-cyclic low-density parity-check code, bit error rate, net coding gain

中图分类号:

TN929.53

袁建国, 刘文龙, 黄胜, 王永. 光通信系统中QC-LDPC码的新颖构造方法[J]. 北京邮电大学学报, 2013, 36(3): 20-24.

YUAN Jian-guo, LIU Wen-long, HUANG Sheng, WANG Yong. Construction Method of QC-LDPC Codes in Optical Communication Systems[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2013, 36(3): 20-24.

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光通信系统中QC-LDPC码的新颖构造方法

Construction Method of QC-LDPC Codes in Optical Communication Systems

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