A novel method for constructing equideviate matrix-based QC-LDPC codes in optical communication systems

Huang Sheng; Tian Fangfang; Yuan Jianguo; Tian Kai

doi:10.13756/j.gtxyj.2014.03.008

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A novel method for constructing equideviate matrix-based QC-LDPC codes in optical communication systems

- A novel method for constructing equideviate matrix-based QC-LDPC codes in optical communication systems
- Study on Optical communication Issue 3, Pages: 24-26(2014)
- 作者机构：
  
  重庆邮电大学光纤通信技术重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2014.03.008
  CLC： TN929.1
- Published：2014，
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[1]黄胜,田方方,袁建国,田凯.光通信系统中基于等差矩阵的QC-LDPC码[J].光通信研究,2014(03):24-26.

Huang Sheng, Tian Fangfang, Yuan Jianguo, et al. A novel method for constructing equideviate matrix-based QC-LDPC codes in optical communication systems. [J]. (3):24-26(2014)
[1]黄胜,田方方,袁建国,田凯.光通信系统中基于等差矩阵的QC-LDPC码[J].光通信研究,2014(03):24-26. DOI： 10.13756/j.gtxyj.2014.03.008.

Huang Sheng, Tian Fangfang, Yuan Jianguo, et al. A novel method for constructing equideviate matrix-based QC-LDPC codes in optical communication systems. [J]. (3):24-26(2014) DOI： 10.13756/j.gtxyj.2014.03.008.

摘要

基于等差矩阵的性质特征

提出了一种QC-LDPC（准循环低密度奇偶校验）码的新颖构造方法。该构造方法易于有效编译码

具有良好的围长特性

可有效避免四环

使生成的码字不受短环的干扰

且在硬件实现方面可节省存储空间。仿真结果表明:当误码率达到10-7时

该构造方法造出的高码率QC-LDPC（3780

3542）码与ITU-T G.975中的RS（255

239）码相比

其净编码增益提高了约2.1dB

具有更好的纠错性能;与QC-LDPC（4221

3956）码相比

净编码增益提高了0.35dB。

Abstract

On the basis of the property and features of equideviate matrixes

a novel method for constructing Quasi-Cyclic LowDensity Parity-Check（QC-LDPC）codes is presented in this paper.The LDPC codes constructed in this method are easy for effective encoding and decoding

have good girth properties and can avoid the girth-4effectively

which prevents the generated codes from short cycle interference.Furthermore

it can save the storage space in terms of hardware implementation.The simulation results show that when the bit error rate reaches 10-7

the net coding gain of the high code-rate QC-LDPC（3780

3542）constructed this way is improved by about 2.1dB as compared with that of the RS（255

239）code in ITU-T G.975

proving that the code has a better error correcting performance

and by 0.35dB as compared with that of regular QC-LDPC（4221

3956）code.

关键词

等差矩阵准循环低密度奇偶校验码净编码增益

Keywords

equideviate matrixQC-LDPC codesnet coding gain

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