Applications of quasi-cyclic LDPC codes in atmospheric laser communications

Zhou Jianguo1; Hao Shiqi1; Liu Jialin1; Chen Peng1

doi:10.13756/j.gtxyj.2013.03.010

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Applications of quasi-cyclic LDPC codes in atmospheric laser communications

- Applications of quasi-cyclic LDPC codes in atmospheric laser communications
- Study on Optical communication Issue 3, Pages: 18-21(2013)
- 作者机构：
  
  1. 电子工程学院脉冲功率激光技术国家重点实验室
  2. 安徽省电子制约技术重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2013.03.010
  CLC： TN911.2;TN929.12
- Published：2013，
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[1]周建国,郝士琦,刘加林,陈鹏.准循环LDPC码在大气激光通信中的应用研究[J].光通信研究,2013(03):18-21.

Zhou Jianguo1, Hao Shiqi1, Liu Jialin1, et al. Applications of quasi-cyclic LDPC codes in atmospheric laser communications. [J]. (3):18-21(2013)
[1]周建国,郝士琦,刘加林,陈鹏.准循环LDPC码在大气激光通信中的应用研究[J].光通信研究,2013(03):18-21. DOI： 10.13756/j.gtxyj.2013.03.010.

Zhou Jianguo1, Hao Shiqi1, Liu Jialin1, et al. Applications of quasi-cyclic LDPC codes in atmospheric laser communications. [J]. (3):18-21(2013) DOI： 10.13756/j.gtxyj.2013.03.010.

摘要

针对部分QC-LDPC（准循环低密度奇偶校验）码存在秩亏的问题

研究了一种满秩QC-LDPC码的构造方法

这种方法在降低编码复杂度的同时

还减少了短环数量。针对BP（置信传播）译码算法复杂度高的问题

提出了一种改进的BP译码算法

选择变量节点对数似然比值判决门限T=5.3和校验节点选择的边数q=3

在不同强度弱湍流条件下还能在一定程度上改善译码性能。研究表明

文章提出的LDPC码构造方法和译码算法在大气激光通信中具有一定的应用前景。

Abstract

In this paper

we study a method for constructing a full-rank Quasi-Cyclic Low Density Parity Check（QC-LDPC） code

which can reduce encoding complexity and improve the performance of Bite Error Rate（BER） while reducing the number of short cycles.Furthermore

we present an improved Belief Propagation（BP） decoding algorithm

in which by selecting the variables node logarithmic likelihood ratio decision threshold T=5.3 and the number of parity node edges q=3

we can improve the decoding performance to a certain extent under the conditions of weak turbulences with different intensity.Our studies show the construction method for LDPC code and the improved decoding algorithm presented in this paper have broad prospects in atmospheric laser communications.

关键词

大气激光通信准循环低密度奇偶校验码秩置信传播算法

Keywords

atmospheric laser communicationQC-LDPC coderankBP algorithm

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Automation & Information School,Xi’an University of Technology

Electronics and Information School,Xi’an Polytechnic University

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