基于抛物线映射的混沌LT编码算法

Chaotic LT Encoding Algorithm Based on Parabolic Map

该文提出一种基于抛物线映射和混沌置乱方法的LT编码算法。首先用混沌初始值作为密钥,采用抛物线映射产生混沌序列并转换为类均匀分布序列,再通过位置置乱算法生成LT码的度分布和度邻接数据序列,较传统的重要抽样方法具有更高的灵敏度,保留了理论分布的结构。实验结果表明,该算法具有实现结构简单、分组头部开销小、保密性好及高于传统重要抽样方法的性能。

A Luby Transform （LT） encoding algorithm based on parabolic map by using chaotic scrambling method is proposed. Firstly, chaotic sequences are produced by using parabolic map and then transformed into uniform-like sequences. The degree distribution and data set of neighbors of LT codes are generated by using position scrambling algorithm which is more sensitive than traditional importance sampling method keeping the construction of theoretical distribution. Experimental results show that the algorithm has more simple construction, smaller header costs of the packets, better encryption effect and hlrthermore is outperformed the traditional importance sampling method.