时间反转短参考正交双倍速DCSK调制方案

Research on Time-reversal Short Reference Orthogonal Double Speed DCSK Scheme

为解决传统差分混沌移位键控(differential chaotic shift keying,DCSK)通信系统传输数据速率低以及安全性差的问题,提出一种时间反转短参考正交双倍速差分混沌移位键控通信系统(time-reversal short reference orthogonal double speed DCSK,TR-SR-ODBR-DCSK)。该方案利用Walsh函数产生两路正交的混沌信号调制两位数据信息,在同一个时隙内同时传输两个比特信息,信息传输速率提高了一倍,同时提高了通信系统的能量利用率;在此基础上将系统中传输的参考信号进行时间反转,消除同一时隙信号间的相关性,提高系统安全性及信号保密性。利用通用软件无线电外设(universal software radio peripheral,USRP)和LabVIEW仿真软件搭建半实物的仿真平台,仿真结果验证了混沌通信系统的可行性和有效性。

To address the issues of low information transmission rate and poor security of traditional differential chaotic shift keying communication system(DCSK),a time-reversed short reference orthogonal double speed differential chaotic shift keying(TR-SR-ODBR-DCSK)communication system scheme is proposed.The scheme uses Walsh function to generate two orthogonal chaotic signals to modulate two bit data information,and transmits two bits of information in the same time slot at the same time,which doubles the information transmission rate,and at the same time improves the energy utilization rate of the communication system.On this basis,the reference signal transmitted in the system is time reversed,which eliminates the correlation between the signals in the same time slot,and improves the system security and signal confidentiality.The feasibility and effectiveness of the chaotic communication system are verified by using universal software radio peripheral(USRP)and LabVIEW simulation software to build a semi-physical simulation platform.