%0 Journal Article
%T Switch degree distribution: an improved degree distribution for LT digital fountain code<br>开关度分布：一种改进的LT数字喷泉编码度分布
%A LEI Wei-jia
%A LIU Hui-feng
%A XIE Xian-zhong
%A <br>雷维嘉
%A 刘慧锋
%A 谢显中
%J 重庆邮电大学学报(自然科学版)
%D 2012
%I 
%X 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.
%K digital fountain codes
%K LT code
%K robust soliton degree distribution
%K binary exponential distribution
%K switch distribution<br>数字喷泉码
%K LT码
%K 鲁棒孤子度分布
%K 二进制指数度分布
%K 开关度分布
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=5C2694A2E5629ECD6B59D7B28C6937AD&aid=F1E2B134F3CCFA0812364EE80D66A20A&yid=99E9153A83D4CB11&vid=B91E8C6D6FE990DB&iid=CA4FD0336C81A37A&sid=339D79302DF62549&eid=16D8618C6164A3ED&journal_id=1673-825X&journal_name=重庆邮电大学学报(自然科学版)&referenced_num=0&reference_num=8