基于双同步结构的混沌键控调制方法

Chaos Shift-Keying Modulation Method based on Dual Synchronization Structure

针对现有的混沌键控通信系统结构复杂、相图泄密等问题,提出了一种结构简单的新型混沌键控通信系统。在Lü系统的基础上,改造了一个新的混沌信号发生模型作为发射端的驱动系统,在接收端构造基于双同步结构的响应系统。将模拟信号转换为脉冲信号,并将其与混沌信号相乘后的信号发送给响应系统,利用双同步响应系统的误差信号进行判决以实现信号的解调。实验仿真表明,该系统有效消除了混沌信号在相图中分叉的现象,同时实现了语音信号的保密传输,证明了该系统在保密通信中的可实现性和高安全性。

For the existing complicated structure and weak system confidentiality of chaos keying communication systems,a novel chaos shift keying communication system with simple structure is proposed.Based on Lü chaos system as the drive system,a new chaotic generation model is modified as the drive system at the launch side,while the response system based on double synchronization structure constructed at the receiver.The analog signal is converted into the pulse signal,and then the pulse signal multiplied by the chaotic signal and sent to the response system,and finally demodulated by the error signal of the double synchronous response system.The simulation results indicate that the system can effectively eliminate the bifurcation of chaotic signal in phase diagrams,and realize the secure transmission of speech signal,and that this proposed system is feasible and secure in secure communication.