LT码截短度分布对译码性能影响的研究  

Influence of the chopped degree distribution on the decoding performance in LT codes

作　　者：周琳凯[1] 刁鸣[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2013年第2期15-17,21,共4页Applied Science and Technology

摘　　要：为了提高喷泉码的编译码性能,以LT码为基础,研究度分布对译码性能的影响.设计了一种基于RSD分布的截短度分布,并分析了这种截短度分布的译码性能.通过与其他截短度分布进行比较,新的截短度分布在保证译码成功时所需的开销更少,并且发现影响截短度分布性能的因素为最大度值及其概率密度,最大度值的选取与输入符号数有关.In order to improve the performance of the encoding and decoding of fountain codes, this paper studied the influence of the degree distribution on the coding performance of the LT codes. This paper introduced a new chopped degree distribution based on the RSD distribution. Then the decoding performance of the new distribution was analyzed. By comparing with other chopped degree distributions, the new degree distribution needs less overhead for successfully decoding than the others. And we find the factors influencing the performance of chopped degree distribution are the maximum degree in distribution and its probability density. The selection of maximum degree is related with the input symbols.

关 键 词：LT码 RSD分布 截短度分布 CRS分布 译码性能 

分 类 号：TN919.3[电子电信—通信与信息系统]