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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。
LT code is a kind of realistic fountain code. Because of its own characteristics, fountain code can overcome the difficulty of feedback in deep space communication, distance and time delay. This paper introduces the distributed LT code suitable for deep space communication with relay transmission and the system LT code with lower complexity and lower system overhead than ordinary LT code. On this basis, a systematic encoding method of two source distributed LT codes is proposed, and its performance is verified through the simulation results, which provides a kind of excellent coding scheme and advice for the application of fountain codes in deep space communication.