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.