采用反馈式多级喷泉码的深空中继协作传输协议研究

Cooperative Transmission Scheme Using Feedback-based Multi-stage Fountain Coding for Deep Space Communications

针对深空长时延、高误码率等通信特点,在传输过程中引入反馈信道,研究了在深空中继协作通信模型中如何有效地利用有限的反馈信号,提出了基于反馈式多级喷泉码的深空中继协作传输协议.阐明了基于反馈式多级喷泉码的中继协作传输协议具体的编码结构和传输方案,从理论上分析了所提出的传输协议与非反馈喷泉码传输协议的传输性能,并通过实验比较了上述两种传输协议以及基于喷泉码的译码转发中继协作传输协议在不同误码率和传输距离的深空通信环境下的传输性能.仿真结果表明,采用多级反馈式喷泉码中继协作传输协议提高了编码有效性,降低了传输时延.

A cooperative transmission scheme based on the feedback-based multi-stage fountain coding is proposed to cope with thelong propagation delay and high rate error though effectively utilizing limited feedback signals for deep space communications. In par-ticular, we fwst present the framework of coding and transmission, and then theoretically evaluated the coding efficiency and transmis-sion delay of the proposed scheme, which are compared with the present cooperative transmission schemes without feedbacks. Simu-lation results show that the proposed transmission scheme can improve the coding efficiency and reduce the transmission delay.