A complexity reduction method for decoding algorithm for LDPC codes in fiber-optic communications

Wang Wei; Xu Bo

doi:10.13756/j.gtxyj.2009.01.014

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A complexity reduction method for decoding algorithm for LDPC codes in fiber-optic communications

- A complexity reduction method for decoding algorithm for LDPC codes in fiber-optic communications
- Study on Optical communication Issue 1, Pages: 21-23(2009)
- 作者机构：
  
  电子科技大学通信与信息工程学院宽带光纤传输与通信网技术教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2009.01.014
  CLC： TN929.11
- Published：2009，
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[1]王伟,许渤.光纤通信中降低LDPC码译码复杂度的方法[J].光通信研究,2009(01):21-23.

Wang Wei, Xu Bo. A complexity reduction method for decoding algorithm for LDPC codes in fiber-optic communications. [J]. (1):21-23(2009)
[1]王伟,许渤.光纤通信中降低LDPC码译码复杂度的方法[J].光通信研究,2009(01):21-23. DOI： 10.13756/j.gtxyj.2009.01.014.

Wang Wei, Xu Bo. A complexity reduction method for decoding algorithm for LDPC codes in fiber-optic communications. [J]. (1):21-23(2009) DOI： 10.13756/j.gtxyj.2009.01.014.

摘要

伪循环（QC）低密度奇偶校验（LDPC）码可以给光纤通信系统带来更高的编码增益

但译码过程需要的对数似然比（LLR）的计算很复杂。为了降低LDPC译码器硬件设计的复杂度

文章提出一种光纤信道下简化的LLR的计算方法。仿真结果表明

该计算方法与原计算方法相比仅有0.05 dB的译码性能损失。

Abstract

Quasi-Cyclic Low-Density Parity-Check（QC-LDPC） code can bring about higher coding gain for fiber-optic communication systems

but the computation of Log-Likelihood Ratio（LLR） in the decoding process is very complicated.To reduce the complexity of the decoder hardware design

this paper introduces a simplified LLR algorithm in fiber channels.The simulation results show that this algorithm is subject to a decoding performance loss of only 0.05 dB compared with the original one.

关键词

光纤通信低密度奇偶校验迭代译码译码器

Keywords

fiber optic communicationLDPCiterative decodingdecoder

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Department of Electronic Engineering,Hubei University of Economics

CSIC No.722 Research and Development Institute

Naval Aeronautical and Astronautical University

Key Lab of Broadband Optical Transmission and Communication Network,UESTC

Department of Electric Science,Peking University

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