基于整数运算的LDPC码改进分层译码算法  

Improved layered decoding algorithm for LDPC codes based on integer operation

作　　者：张嵩[1] 马林华[1] 唐红[1] 田雨[1] 马汇淼[1] 

机构地区：[1]空军工程大学航空航天工程学院,陕西西安710038

出　　处：《系统工程与电子技术》2013年第3期638-642,共5页Systems Engineering and Electronics

基　　金：陕西省"电子信息系统综合集成"重点实验室重点基金(2011.ZD01;2011.02Y02)资助课题

摘　　要：对低密度奇偶校验(low-density parity-check,LDPC)码在高斯信道下的分层译码算法进行深入研究,提出了一种基于整数运算的LDPC码改进分层译码算法。该算法中所有变量都用整数表示,因此非常便于硬件实现;同时将修正因子引入到分层译码算法中,使其译码性能有进一步地提高。在加性高斯白噪声信道下的仿真结果表明,改进分层译码算法有效地降低了计算复杂度,加速了译码收敛,并且具有更低的错误平层。Based on the investigation of the low density parity check （LDPC） codes’ layered decoding algorithm in additive white Gaussian noise （AWGN） channel, an improved layered decoding algorithm based on integer operation is proposed for decoding LDPC codes. All the variables are indicated as integers in the proposed algorithm, so it is very convenient for implementation in hardware. At the same time, a modified factor is introduced to improve the layered decoding algorithm. With this modified factor, its decoding performance is improved greatly. Simulation results in AWGN channel show that the improved layered decoding algorithm can not only reduce the computation complexity and accelerate the convergence rate, but also have a lower error floor.

关 键 词：低密度奇偶校验码 分层译码算法 整数运算 修正因子 

分 类 号：TN911.22[电子电信—通信与信息系统]