基于MIMO的IDCSK保密通信系统性能分析

Performance analysis of IDCSK secure communication in MIMO systems

给出了MIMO环境下改进型差分混沌相移键控(MIMO-IDCSK)通信系统的设计方案,并对系统性能进行了分析.传统的DCSK系统需要2个时间片分别发送混沌参考信号和数据承载信号,在IDCSK系统中,利用时间反转操作产生和数据承载信号正交的参考信号,然后对2路信号在1个时间片内进行求和、发送.改进方案把比特间隔缩短了一半,使得数据传输速率提高了1倍,并提高了频谱利用率.仿真结果显示:和传统DCSK通信系统相比,新型MIMO-IDCSK保密通信系统的性能更为优越,与理论分析相符.

This paper presents the design and performance analysis of an improved differential chaos shift keying(IDCSK)communications in a multiple-input multiple-output(MIMO)system.In conventional DCSK scheme,sending reference and data carrier signals need two time slices,in the IDCSK system,a time reversal operation is used to generate an orthogonal reference signal to the data carrier signal and then add up these two sequences into one time slice before transmission.This improved scheme reduces the bit duration to half,which doubles the data rate and improves spectral efficiency.The simulation results show that the performance of the novel MIMO-IDCSK secure communication system is greatly superior to that of the conventional DCSK communication system.The theoretical analysis and simulation results are well consistent.