短长度分布式喷泉码的性能分析

Performance of Short-Length Distributed LT Code

LT码是喷泉码的一种,由于深空通信不能实现反馈,距离远,变时延的传输特性,LT码适合用于深空通信中,由于传统的单信源通信已经不能满足当前的通信需求,多信源多中继通信系统成为了研究的重点。介绍了短长度分布式二、四信源的通信模型,以及各自的度分布,并选取了码长较短、删除概率较小这几种情形通过仿真验证了各自的性能。仿真结果表明,二、四信源分布式LT码比LT码有更好的性能。

For the deep space communications could not realize feedback,long distance,variable delay and other propagation characteristics,LT code,as a fountain code,is suitable for deep space communications.As the traditional single-source communications can no longer meet today’s communication needs,the multiple-source and multiple-relay communication system become the focus of research.This paper mainly describes the short-length distributed LT code channel models and their respective degree distributions.Short-length and low erasure-probability distributed LT codes are selected,and their performance verfifations done simulation indicates that the distributed LT codes with two or four source could yield better performance compared with LT codes.