减少振荡的改进多进制LDPC码译码方法  

A Modified Q-LDPC Decoding for Reducing Oscillation

作　　者：周伟[1] 门爱东[1] 陈昕[1] 全子一[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《北京邮电大学学报》2008年第1期45-47,51,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：高等学校优秀青年教师科研奖励计划项目

摘　　要：基于多进制低密度奇偶校验码(Q-LDPC)译码过程中的振荡现象,提出了一种改进译码方法.在每一次译码迭代过程中,使每个发生振荡的变量节点处输出的信息包含上次信息和当前迭代后得到的信息,从而减小振荡影响.该算法计算复杂度低,仿真表明可有效降低中短码长的Q-LDPC码的误码率和误块率.Based on the oscillation phenomenon in the decoding of Q-LDPC （q-ary low-density paritycheck） codes, a modified decoding algorithm was proposed. In each iteration, for oscillating variable nodes, the previous posteriori probabilities are added to the current posteriori probabilities to reduce effects of oscillating in decoding. The computer simulation shows that the modified decoding algorithm can reduce bit error rate and block error rate for short and middle length Q-LDPC codes with low complexity.

关 键 词：多进制低密度奇偶校验码 置信传播 振荡 

分 类 号：TN911[电子电信—通信与信息系统]