LDPC码的改进译码算法  

Improved decoding algorithm of Low-Density Parity-Check codes

作　　者：林雪红[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《电路与系统学报》2007年第3期128-130,共3页Journal of Circuits and Systems

基　　金：国家自然科学基金项目(60272052)

摘　　要：由于短帧长LDPC码存在很多环路,其译码性能不具有最优性。本文首先推导了有环路LDPC码的概率译码算法,然后在传统的概率译码算法引入了修正系数,从而减小了环路对译码性能的影响。仿真结果表明,采用改进的译码算法可以提高译码性能。LDPC codes with short blocks deviate from the predicted performance, the most likely reason is that they contain quite a few cycles. This paper deduces the probability decoding algorithm of LDPC codes with cycles, and proposes a new algorithm that introduces a correction coefficient to mitigate the impact of cycles on decoding performance. From the simulation results, the new algorithm can improve the decoding performance.

关 键 词：LDPC码 概率译码算法 因子图 周长 

分 类 号：TN919.22[电子电信—通信与信息系统]