系统分布式LT码的构造

LT码是一类可现实的喷泉码,喷泉码由于其本身的特性可以克服深空通信中反馈难以实现,距离远,变时延的困难。依次介绍了在有中继传输的深空通信中适用的分布式LT码编码以及相对普通LT码编译码复杂度更低,系统开销更小的系统LT码。在此基础上提出系统的两信源分布式LT码的编码方法,并通过仿真结果验证其性能,为喷泉码在深空通信中的应用提供了一类性能优良的编码方案和建议。

Construction of Systematic Distributed LT Codes

LT code,as a fountain code and for its own feature,is applied to deep space communications and could solve the problems including hard feedback,long distance,variable delay and other propagation characteristics.This paper mainly describes distributed LT code suitable for deep space communications with relay transmission,including encoding and decoding methods of the systematic LT code with comparatively low complexity and overhead.Then based on this,the construction method of systematic two-source distributed LT code is presented.Simulations proves that this method is effective,and the study on fountain code could provide some excellent coding schemes suitable for deep space communications.