基于分段线性混沌映射的Turbo喷泉实现

Implementation of Turbo-fountain based on piecewise linear chaotic map

为了提高Turbo喷泉码在噪声信道上的性能,提出了一种基于分段线性混沌映射(PLCM)的Turbo喷泉实现方法.在Turbo喷泉预编码单元中采用PLCM方法实现混沌交织器的设计,同时使用相同的初始值、相同结构的PLCM来设计生成无限长序列的分支序列生成器,最大程度置乱信息序列.在AWGN信道和Rayleigh衰落信道下,采用提出的方法与随机交织方法进行了仿真.实验结果表明,该方法与使用随机交织方法相比,能够有效提高Turbo喷泉码的性能,使其更接近Shannon限,且具有灵活易控的特点.

An implementation method based on piecewise linear chaotic map（PLCM） was put forward to improve the performance of Turbo-fountain code on noisy channels.In Turbo-fountain precoding unit,the PLCM method was employed to design the chaotic interleaving,and the PLCM with the same initial value and structure was applied to design the branch sequence generators for infinite sequence,which would make the scrambling degree of information sequence as large as possible.The proposed method and random interleaving method were adopted to perform the simulation on both AWGN channel and Rayleigh fading channel.The simulation results show that the proposed method can effectively improve the performance of Turbo-fountain code compared with the random interleaving method,and make it much closer to the Shannon limit.The proposed method is also flexible and easy to control.