基于Simulink的微弱BPSK信号混沌解调仿真研究  

Simulation studies on chaos demodulation of weak BPSK signal based on Simulink tools

作　　者：高清山[1] 张天骐[1] 黄铫[1] 虞路勤[1] 

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《计算机应用》2009年第12期3211-3214,共4页journal of Computer Applications

基　　金：NSAF联合基金资助项目(10776040);国家自然科学基金资助项目(60602057);重庆市科委信号与信息处理重庆市市级重点实验室建设项目(CSTC;2009CA2003);重庆市科委项目(CSTC;2009BB2287);重庆市教委基金(K1060509;KJ080517)

摘　　要：针对微弱二进制相移键控(BPSK)信号的解调问题,对基于混沌系统的解调方法进行了研究。介绍了混沌系统微弱信号检测的原理,结合混沌系统产生相变的相位条件和BPSK信号的调制方式,给出了利用Duffing系统进行强噪声背景中BPSK信号解调的方法和步骤,并提出了利用功率谱熵对系统不同状态复杂度进行判别的新方法。在理论分析的基础上,建立了Matlab/Simulink仿真模型。仿真结果表明,利用混沌振子和功率谱熵解调微弱BPSK信号的性能优于传统的相干解调方法。Concerning the problem of demodulating the weak Binary Phase Shift Keying （BPSK） signal, the demodulation method based on chaotic system was researched.. The basic principle of the chaotic system weak signal detection was introduced. By combining with the phase condition of the phase change happening and the modulation method of BPSK signal, the methods and steps of using Duffing system to demodulate the BPSK signal in strong noisy background were given. And a new method was presented for power spectrum entropy to judge the complexity of the different system state. Based on theoretical analysis, the simulation model based on Matlab/Simulink was built. The digital simulation results show that the performance of demodulating the weak BPSK signal using chaotic oscillator and power spectrum entropy is better than that of traditional coherent demodulation method.

关 键 词：DUFFING振子 BPSK信号 功率谱熵 解调 SIMULINK模型 

分 类 号：TN911.72[电子电信—通信与信息系统]