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深空通信时延长、误码率和丢包率大、上下行链路带宽不对称和链路易中断等特点,决定了编译码技术成为深空通信中的一个难点问题。介绍了喷泉码的基本概念和特点,分析了喷泉码的全选问题、阶的分布问题和译码算法以及LDPC译码算法的性能等问题,提出了在深空通信中采用内码为LDPC码、外码为喷泉码的级联码方式,分析了该级联码的性能。结果表明,该码具有较好的性能以及与码长成线性关系的译码复杂度,能够满足深空通信对于信息传输可靠性的要求,满足通信质量要求,在深空通信中有很大的应用潜力。
Deep space communication, extended, bit error rate and packet loss rate, the uplink and downlink bandwidth asymmetry and easy to interrupt the link, etc., determines the codec technology to become a difficult issue in deep space communications. The basic concepts and characteristics of fountain codes are introduced. The problems of fountain code selection, order distribution and decoding algorithms as well as the performance of LDPC decoding algorithms are analyzed. It is proposed that the inner code is LDPC code , The outer code is fountain code cascade code way, analyzes the performance of the cascade code. The results show that the code has good performance and decoding complexity linearly with the code length, can meet the requirements of deep space communication for the reliability of information transmission, meet the requirements of communication quality, and has a great Application potential.