基于Kent映射的数字喷泉编解码方法研究  

RESEARCH ON THE DIGITAL FOUNTAIN CODES AND DECODES ALGORITHM BASED UPON KENT MAPPING

作　　者：陈增强[1] 周茜[1] 袁著祉[1] 

机构地区：[1]南开大学自动化系,天津300071

出　　处：《系统科学与数学》2011年第6期731-741,共11页Journal of Systems Science and Mathematical Sciences

基　　金：教育部博士点基金(20090031110029);国家自然科学基金(60774088)资助课题

摘　　要：将混沌方法应用于网络传输应用层的数字喷泉编码技术中,提出了基于Kent混沌映射的LT码的编解码算法.在LT码编码过程中,利用混沌序列的随机性和遍历性的特性来满足对随机的要求,为每个编码包选择了度值和邻居.把以这种方式实现的LT码的性能和用C语言的标准随机数发生器实现的LT码的性能作了比较,仿真结果表明利用混沌随机性实现的LT码的性能具有优越性.This paper applies chaos method in the digital fountain codes, which is in the transport and application layer of communication network. An encoding and decoding algorithm of LT codes based on Kent chaotic map is proposed. In the encoding process, the authors use the randomness and ergodic properties of chaotic sequence to determine degree value and neighbors of each encoding packet. The performance of LT codes based on chaos is compared with that of LT codes implemented with standard pseudorandom number generator in C programming language. It is found that LT codes based on chaos have better performance.

关 键 词：数字喷泉码 编码与解码算法 LT码 Kent映射 度分布 

分 类 号：TN911.22[电子电信—通信与信息系统]