PLDPC码的相关信源联合译码系统设计与分析  

Design and analysis of joint decoding of correlated sources systems based on PLDPC codes

作　　者：肖旻 高天 XIAO Min;GAO Tian(School of OPTO-Electronic and Communication Engineering,Xiamen University of Technology,Xiamen 361005,P.R.China)

机构地区：[1]厦门理工学院光电与通信工程学院,厦门361005

出　　处：《重庆邮电大学学报（自然科学版）》2022年第1期51-58,共8页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：福建省自然科学基金(2018J01569)。

摘　　要：为了在保证纠错性能的情况下提高相关信源联合译码(joint decoding of correlated sources,JDCS)系统的可实现性,将具有结构化特性、易于实现的原模图LDPC(protograph-based LDPC,PLDPC)码引入JDCS系统。针对传统基于原模图的外部信息转移(protograph-based extrinsic information transfer,PEXIT)算法无法直接分析JDCS系统中子译码器之间所传递的外信息这一问题,提出了一种适合JDCS系统的性能分析算法——JDCS-PEXIT算法,利用该算法对采用不同PLDPC码的JDCS系统进行了性能分析,并进一步分析比较了不同信源相关度情况下JDCS系统的门限值。性能仿真结果显示,当引入两类常用的原模图LDPC码——AR3A码和AR4JA码后,相关信源联合译码系统的性能均优于传统置信度传播(belief propagation,BP)译码,且随着信源相关度的提升,相关信源联合译码系统的性能也会不断增强。仿真结果与JDCS-PEXIT算法的分析结果相匹配。In order to improve the realizability of joint decoding of correlated sources(JDCS)systems while ensuring their error correction performances,protograph-based LDPC(PLDPC)codes with structed coding that permits easy implement are introduced into the JDCS systems.In this paper,aiming at solving the problem that the traditional protograph-based extrinsic information transfer(PEXIT)algorithm cannot analyze the extrinsic information transmitted between sub-decoders in the JDCS system,a performance analysis algorithm——JDCS-PEXIT algorithm is proposed which is suitable for JDCS systems.The JDCS-PEXIT algorithm is used to analyze the performances of JDCS systems with different PLDPC codes,and further to analyze the thresholds of JDCS systems under different source correlation coefficients.The simulation results show that with two classes of widely-used PLDPC codes——AR3A and AR4JA codes,the performances of JDCS systems are much better than those of the traditional systems under the BP algorithm.With the increasing of source correlation coefficients,the performances of JDCS systems will be enhanced correspondingly.The simulation results match the analysis results of the JDCS-PEXIT algorithm.

关 键 词：相关信源 原模图LDPC码 联合译码 门限值 

分 类 号：TN911.22[电子电信—通信与信息系统]