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开关度分布:一种改进的LT数字喷泉编码度分布
引用本文:雷维嘉,刘慧锋,谢显中.开关度分布:一种改进的LT数字喷泉编码度分布[J].重庆邮电大学学报(自然科学版),2012,24(1):34-38.
作者姓名:雷维嘉  刘慧锋  谢显中
作者单位:重庆邮电大学个人通信研究所,重庆,400065
基金项目:国家自然科学基金(60872037);重庆市自然科学基金(CSTC,2011jjA40006);重庆邮电大学博士启动基金(A2011-03)
摘    要:LT数字喷泉编码所采用的度分布是影响译码效率的关键因素。给出了一种改进的LT数字喷泉编码的度分布,即开关度分布,它结合鲁棒孤子分布和二进制指数分布的优点,可以产生足够多的度很小的编码数据包,减少了译码器启动译码过程所需要的编码数据包的数量,而且减少了译码器成功译码时所需要的编码数据包的总数量。通过仿真给出了最佳的开关点参数。仿真显示,与鲁棒孤子度分布和二进制指数度分布相比,采用开关度分布,明显改善了译码效率。

关 键 词:数字喷泉码  LT码  鲁棒孤子度分布  二进制指数度分布  开关度分布
收稿时间:6/2/2011 12:00:00 AM

Switch degree distribution: an improved degree distribution for LT digital fountain code
LEI Wei-ji,LIU Hui-feng,XIE Xian-zhong.Switch degree distribution: an improved degree distribution for LT digital fountain code[J].Journal of Chongqing University of Posts and Telecommunications,2012,24(1):34-38.
Authors:LEI Wei-ji  LIU Hui-feng  XIE Xian-zhong
Affiliation:Institute of Personal Communication, Chongqing University of Posts and Telecommunications, Chongqing 400065, P.R.China
Abstract:The degree distribution applied in the LT digital fountain code encoder is a key factor to the decoding efficiency. This paper presents an improved degree distribution which is called Switch Distribution. It combines the advantages of binary exponential distribution and robust soliton degree distribution. When the degree of the coded packets is chosen from Switch Distribution, it can generate enough encoded packets with small degrees. This distribution decreases the number of encoded packets when the decoding process firstly starts and decreases the number of source transmitted packets for recovering the source information successfully at the distination. We obtain the best switch point by simulation. Compared with using Robust Soliton Distribution and Binary Exponential Distribution, using Switch Distribution can greatly increase the decoding efficiency.
Keywords:digital fountain codes  LT code  robust soliton degree distribution  binary exponential distribution  switch distribution
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