提高卫星通信系统吞吐量的复数域网络编码算法

Research on the Complex Field Network Coding for the Throughput Improving of Satellite Communication Systems

针对传统卫星通信系统吞吐量不高的问题,本文提出了一种基于复数域网络编码(CFNC)的卫星通信系统方案。该方案在发送前对信号进行符号级的CFNC编码,在不增加终端发射功率的情况下提供比传统卫星通信系统更高的吞吐量,并适用于多用户网络。该方案同时适用于基于处理转发器和透明转发器的卫星平台。特别是在双向卫星通信系统中,与基于伽罗瓦域网络编码(GFNC)的系统相比,本文提出的方案不仅具有更高的吞吐量而且更具有普适性。

In order to improve the throughput of traditional satellite communication systems,a new satellite communication system was proposed based on the complex field network coding （CFNC）in this paper.By encoding signals of every user-end with CFNC before transmitting,the proposed scheme exhibited desirable throughput compared with traditional satellite communication systems.Considering that there were different types of communication satellite platforms,this scheme was suited for both processing transponder based communication satellites and transparent transponder based communication satellites.What’s more,this scheme supported symbol-level signals to be encoded and multiple end-users networks without increasing the transmit-power.We analyzed the throughput and symbol error probability （SEP）of the proposed scheme,and it was proved that this scheme increased the system throughput without much loss of SEP performance.Specially,performance of the proposed scheme was compared with that of the Galois field network coded （GFNC）scheme in the two-way satellite communication system,and it was demonstrated that the proposed scheme had advantages of higher throughput and more general implementation circumstances.Finally,analytical results were supported and validated by numerical simulations.