一种基于短LT码的级联编译码算法  

Concatenated Coding Algorithm Based on LT Codes with Small Message Length

作　　者：黄晓可[1] 刘洛琨[1] 郭虹[1] 

机构地区：[1]解放军信息工程大学信息系统工程学院,郑州450002

出　　处：《数据采集与处理》2014年第3期445-450,共6页Journal of Data Acquisition and Processing

基　　金：国家高技术研究发展计划("八六三"计划)(2009AA011205)资助项目

摘　　要：针对实时无线通信对短纠删码的需求,提出一种短码长LT码与传统纠错码的级联方案。在综合考虑算法复杂度与纠错性能的情况下,选取RS码和卷积码的级联(Reed solomon convolution coding,RS-CC码)以构造等效删除信道,并采用实时性高的短LT码实现纠删功能。设计了一种适合短LT码的译码算法,同时给出了编码度分布的选取方法。仿真结果表明,与已有短喷泉码相比,文中短LT码成功译码时所需编码冗余更少,应用到级联方案后的数据传输可靠性明显提高。A concatenated scheme combining short length Luby transform（LT） codes with traditional error correcting codes is proposed for the requirement of short erasure correcting codes in real-time communication. Considering the complexity and overhead of the scheme, Reed solomon-convolution coding（RS-CC） is used to construct equivalent erasure channels, and the short LT codes are concatenated to correct erasure errors. A decoding algorithm is proposed for the short LT codes, and the degree distribution selection method is presented for small message length. Simulation results demonstrate that compared with the existing codes, the reliability of the concatenated scheme is enhanced with less overhead.

关 键 词：前向纠错 短LT码 级联码 删除信道 

分 类 号：TN911.7[电子电信—通信与信息系统]