论文部分内容阅读
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。
LT code is a type of fountain code. Due to the fact that deep space communication can not realize the feedback, long distance and variable delay transmission characteristics, the LT code is suitable for deep space communication. Because traditional single-source communication can not meet the current communication Demand, multi-source multi-relay communication system has become the focus of research. The communication models of short and long distributed two and four sources are introduced, and their degree distributions are also introduced. Several cases with short code length and small deletion probability are selected to verify their performance through simulation. Simulation results show that two or four source distributed LT codes have better performance than LT codes.