基于多级反馈式喷泉码的深空传输协议研究

Multi-stage Feedback Fountain Code for Deep Space Transmission Scheme

针对深空环境中高误码率、长传输时延的通信特点,在传统喷泉码的基础上提出了一种基于多级反馈式喷泉码的深空通信传输协议。给出了基于多级反馈式喷泉码传输协议具体的编码结构和传输方案,从理论上分析了该传输协议与非反馈喷泉码传输协议的编码有效性和传输时间,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。实验结果表明,基于多级反馈式喷泉码的传输协议提高了编码有效性,减少了文件传输时延。

A transmission scheme of deep space communication based on multi-stage fountain code was proposed to cope with the high error rate and long propagation delay in deep space communications. In particular, the framework of co- ding and transmission were first presented, and then the coding efficiency and transmission time of this scheme were theo- retically evaluated comparing to the present transmission scheme without feedback. Additionally, the performance of these two schemes and the decoding forward transmission scheme at difference bit error rates and transmission distances were analyzed. The results show that the proposed transmission scheme improveed the coding efficiency and reduces the file propagation delay.