卫星数据广播分发系统中LT码的研究  

Research of LT code in satellite data broadcasting system

作　　者：朱宏鹏[1] 张更新[1] 李广侠[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《通信学报》2010年第7期122-127,135,共7页Journal on Communications

基　　金：国家自然科学基金资助项目(60472049)~~

摘　　要：提出了喷泉码中LT码的最优度分布算法,指出了其在实际应用中存在的问题,在此基础上提出了实用的次优度分布算法。仿真表明,在卫星数据广播分发系统中,采用基于次优度分布算法的改进型LT码,其信道利用率要优于基于健壮孤立子度分布算法的传统LT码,且远远好于采用RSE码和不采用分组级FEC技术时的信道利用率,研究结果对提高卫星数据广播分发系统的信道利用率具有重要的实用价值。The optimal degree distribution algorithm of LT code of fountain codes was proposed,and its drawbacks in realization were mentioned.On the basis of optimal degree distribution,a practical sub-optimal degree distribution algorithm was put forward.Through simulation,with respect to the channel efficiency in satellite data broadcasting system,advanced LT code based on sub-optimal degree distribution algorithm performs better than classical LT code based on Robust soliton degree distribution algorithm,RSE code and that without packet-level FEC technology.The conclusion of research is practically valuable in improving the channel efficiency of satellite data broadcasting system.

关 键 词：卫星通信 次优度分布 均值优化 LT码 喷泉码 

分 类 号：TN927.2[电子电信—通信与信息系统]