面向深空通信的分布式系统Raptor码传输机制  

Distributed Systematic Raptor Coding Scheme in Deep Space Communications

作　　者：焦健[1] 聂胜贤 杨轶[1] 顾术实[1] 吴绍华[1] 张钦宇[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院,深圳518055

出　　处：《宇航学报》2016年第10期1232-1238,共7页Journal of Astronautics

基　　金：国家自然科学基金(61201144;61371102);国家高技术研究发展计划(863计划)(2014AA01A704);哈工大创新基金项目(HIT.NSRIF.2017051);深圳市基础研究项目(JCYJ20150930150304185;JCYJ20160328163327348)

摘　　要：为缓解深空探测器与地面站之间的超远距离和星体遮挡,而导致巨大的信号衰减以及链路频繁中断的问题,基于容迟/容断网络(DTN)协议框架,利用轨道器进行多跳中继组网传输,设计了多个探测器经过轨道器向地面传输场景下的分布式系统Raptor编码传输方案(DSRC)。提出了联合译码简化方案,理论分析推导了DSRC方案及改进方案的性能参数,并与现有分布式无速率纠删方案进行仿真比较,在译码冗余为5%时达到了0.01的译码失败率。In Mars exploration missions, due to the long propagation distance and planet occultation in rovers-to-Earth direct link, data transmission suffers a huge loss and frequent interruptions in connectivity. Based on delay tolerant network （DTN） framework, a distributed systematic Raptor coding （DSRC） scheme is proposed for the multi-hop relay transmission data through an orbiter to Earth communications scenario. A simplified joint decoding scheme is designed, and the asymptotic performance of DSRC scheme is analyzed. Moreover, the improved DSRC scheme is optimized for the finite code-length. Simulation results show that the DSRC scheme can achieve a decoding failure rate of 0.01 with a decoding overhead of 5% , which outperforms the existing distributed rateless erasure codes.

关 键 词：深空通信 分布式网络 系统Raptor码 网络编码 

分 类 号：V443.1[航空宇航科学与技术—飞行器设计]