多用户混沌扩频通信系统的设计与仿真  

Design and Simulation of Multi-user Chaotic Sequence Spread-Spectrum Communication System

作　　者：孙克辉[1] 周家令[1] 牟俊[1] 

机构地区：[1]中南大学物理科学与技术学院,湖南长沙410083

出　　处：《计算机仿真》2007年第8期112-115,共4页Computer Simulation

基　　金：湖南省自然科学基金项目资助(04JJ3077)

摘　　要：为了研究基于混沌扩频序列的多用户扩频通信系统性能,文章分析了多用户混沌扩频通信系统原理,在Matlab/Simulink平台上,建立了多用户混沌扩频通信系统动态可视化仿真模型,讨论了信号发生器、混沌序列发生器、积分器等主要模块的参数设置,研究了基于Chebyshev混沌映射扩频序列的扩频通信系统中用户数及信道噪声对扩频系统可靠性的影响,比较了混沌序列与m序列扩频通信系统性能。通过Simulink动态仿真结果表明,该系统具有较好的抗噪声和抗多址干扰的能力,且Chebyshev映射产生的混沌序列要明显好于m序列的系统性能。In this paper, the theory of multi - user chaotic sequence spread - spectrum communications system is analyzed in order to investigate the performance of multi - user chaotic sequence spread - spectrum communications system based on chaotic spread - spectrum sequence. The dynamic visual simulation model of multi - user chaotic sequence spread - spectrum communications system is established through the MATLAB＇s SIMUILINK platform. Based on this model, the parameter settings of signal generator, chaotic sequence generator, integrator are discussed. The performances of the system with different signal to noise ratio and the number of users are investigated. The performance of the spread - spectrum communications system between chaotic sequence and m sequence is compared. Simulation results show that the system has very good ability against noise and multiple access interference, and the performance of Chebyshev map is much better than that of m sequence.

关 键 词：混沌序列 直接序列扩频 动态仿真 

分 类 号：TN914[电子电信—通信与信息系统]