非正则LDPC码在AWGN信道中的性能研究  

Performance Study on Irregular Low-density Parity-check Codes on AWGN Channel

作　　者：胡维钢[1] 赵振纲[1] 徐晶晶[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《无线电工程》2008年第3期25-27,36,共4页Radio Engineering

摘　　要：简单介绍了非正则低密度奇偶校验(Low Density Parity Check,LDPC)码的结构。研究了其对数域概率译码的和积算法(Sum Product Algorithm,SPA),并对该算法的主要公式进行了推导,给出了其迭代核心部分的C语言实现伪码。对一种基于802.16e直接编码法生成的非正则LDPC码在高斯信道下进行了仿真分析,表明中短码长的非正则LDPC码已经具有优异的纠错性能。The irregular LDPC （Low Density Parity Check） codes structure is briefly introduced first in this paper.Then the SPA （SumProduct Mgorithm） in the LOG-Likelihood domain are studied. The main formulas of SPA of irregular LDPC codes are deduced and the implementation of initial part of SPA under AWGN channel by using pseudo C codes is also presented. One kind of irregular LDPC codes which generates by using direct encoding method which is proposed by IEEE 802.16e standard is simulated and analyzed under AWGN channel.The result shows that the irregular LDPC codes have excellent error correction capability at moderate or short length.

关 键 词：非正则LDPC码 BP算法 和积算法 误比特率 

分 类 号：TN911.22[电子电信—通信与信息系统]