一种性能优于Turbo码的LDPC规则码  

Research on Performance of Regular LDPC Codes better than Turbo Codes'

作　　者：贺琛[1] 韩建兵[2] 贺鹤云[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]河北科技大学,河北石家庄050018

出　　处：《无线电工程》2008年第5期21-23,共3页Radio Engineering

摘　　要：介绍一种LDPC规则码,其性能优于Turbo码且更接近实用香农极限(1.2dB)。对于LDPC码来讲,稀疏校验矩阵的构造是关键的一步,它影响着码字的性能,这里采用对角线法构造近似下三角形的稀疏校验矩阵,根据此法构造出(n,3,6)的矩阵,满足每行非零元素的个数及分布随机性。译码采用置信传播算法,对此提出矢量化的方法,从而缩减迭代译码时间。A kind of regular LDPC codes is introduced. Its error correcting capability is better than Turbo codes＇ and approaches to Shannon limit （1.2 dB）. The construction of the sparse parity matrix is important, which affects the LDPC codes＇ error correcting capability. In this paper,the diagonal method is adopted to construct sparse check matrix of （n,3,6） in approximate lower triangle,which meets the numbers of and distribution randomicity of nonzero elements. The belief propagation algorithm is used in decoding simulation, and the vectorization method is proposed to reduce the iteration decoding time.

关 键 词：LDPC码 置信传播算法 对角线构造 

分 类 号：TN914[电子电信—通信与信息系统]