一种差分混沌键控通信方案的研究

Study of an improved scheme of DCSK

为了提高效率及传输中的安全性,提出改进的DCSK方案.利用已有的transmitted reference(TR)通信方式将差分混沌键控(DCSK)中的参考信号和信息信号通过不同的线路信道或不同的频带信道传输,在接收端通过相关接收解调二进制数字信号,这一方案回避了延时结构和切换结构,且发送端可以连续工作.改进方案中参考信号和信息信号不在同一频带或线路信道中提高了信号在传输中的安全性.并对方案性能进行了仿真分析,仿真分析表明改进方案具有与DCSK相似的噪声特性,在混沌信号源带宽和信息信号长度相同的条件下,改进系统有更快的信息传输速率.仿真结果说明了该算法有效可靠.

In order to improve efficiency and safety,this paper presents an improved DCSK scheme,which transmits the reference chip and information-bearing chip of the differential chaos shift keying (DCSK) through respective channels (line or bandwidth),and then demodulates the binary digital signal using correlator in the receiver.This scheme avoids delay and switch construct and it can transmit continuously.Because the reference chip and information-bearing chip are transmitted through respective channels,its signals are more difficult to intercept during transmission.The performance of this scheme is simulated and analyzed,indicating that the noise performance of the enhanced scheme is similar with DCSK.It can transmit the signals more quickly than DCSK when they have the same chaotic signal bandwidth and information-bearing chip length.The result of the simulation proves the effect and reliability of the scheme.