基于改进混沌扩频序列的多用户混沌扩频通信系统的研究与仿真

Research and simulation of multi-user chaotic spread spectrum communication based on modified chaotic sequence

提出一种改进混沌扩频序列,并将其应用在多用户混沌扩频通信系统中,给出了多用户混沌扩频通信系统的理论推导和SIMULINK仿真模型。对该系统进行了详细的性能分析,包括信噪比、用户数、改进混沌扩频序列的分形参数和初始值等各自对系统误码率的影响,并比较了改进混沌扩频序列与传统混沌扩频序列的系统误码率随信噪比和用户数的变化情况。结果表明改进混沌扩频序列要好于传统混沌扩频序列的系统误码率,具有较好的抗噪声和抗多址干扰的能力。

This paper constructed a multi-user chaotic spread spectrum communication system based on a modified chaotic sequence.And it gave the theory and SIMULINK simulation model of this system.It also detailelly illustrated the performance of the modified chaotic spread spectrum communication,including the fractal parameter and the initial value of the modified chao-tic sequence,the signal noise rate and the number of user.Simulations analyzed the bit error rate（BER） how it changes depending on the changes in the signal noise rate or the number of user in both the modified chaotic sequence and the traditional chaotic sequence.The results show that the performance of the modified chaotic sequence is much better than that of the traditional chaotic sequence,and the system has very good ability against noise and multiple access interference.