摘要
与传统的喷泉码相比,基于反馈信息的喷泉码可以有效降低译码开销,其编码所采用度分布则是喷泉码设计的关键,本文提出一种适用于反馈喷泉码的基于部分信息度分布构造方法.该方法首先提出具有较小译码开销的最佳单项式度分布函数,并将其与传统的SRSD度分布相结合,然后通过参数调整可以获得修正后的ISRSD度分布函数.仿真结果表明在已知部分信息的喷泉码中,与传统的SRSD度分布函数相比,采用ISRSD度分布函数进行编码使其性能得到明显的提高.
Compared with traditional fountain codes,fountain codes with feedbacks can decrease the decoding overhead effectively. The degree distribution has a very important influence on the decoding efficiency of fountain codes. This paper proposes a newscheme of degree distribution under partial information and we use it in fountain codes with feedback. In the first place,we present an optimum monomial degree distribution with less decoding overhead,and then we combine it with shifted robust soliton distribution（ SRSD）. At last,we get the improved SRSD（ ISRSD） through parameter adjustment. Simulations verify the encoding performance of fountain codes under parity information using ISRSD is greatly improved compared with traditional SRSD.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2016年第2期295-300,共6页
Acta Electronica Sinica
基金
国家自然科学基金(No.61172058)
锦州市科学计划项目(No.12BID13)
关键词
喷泉码
LT码
BP译码
SRSD
fountain codes
LT codes
belief propagation decoder
shifted robust soliton distribution
