新型正交降噪CDSK通信系统

针对置换相关键控(permutation correlated shift keying, PCSK)存在信号间干扰且误码率(bit error rate, BER)较高的问题, 对其进行改进并提出了新型正交降噪相关延迟移位键控(quadrature noise reduction correlation delay shift keying, QNR-CDSK)通信系统。通过设计一种新的正交混沌信号发生器, 产生两路严格正交的混沌信号, 将这两路信号分别作为参考信号和信息承载信号并复制P次后叠加传输, 从而消除信号间干扰。随后使用滑动平均滤波器对接收信号进行滤波处理, 降低系统BER。最后在加性高斯白噪声信道和瑞利衰落信道下推导了系统的BER, 并进行蒙特卡罗仿真验证其性能。结果表明, 与PCSK系统相比, 该系统具有更好的BER性能, 为混沌通信的实际应用提供了参考价值。

Novel quadrature denoising CDSK communication system

In view of the drawbacks of inter signal interference and high bit error rate (BER) in permutation correlated shift keying(PCSK), quadrature noise reduction correlation delay shift keying (QNR-CDSK) communication scheme is proposed. In this scheme, a new orthogonal chaotic signal generator is designed to generate two strictly orthogonal chaotic signals as reference signals and information bearing signals, which are duplicated P times and then superimposed and transmitted, so as to eliminate the interference between signals. At the receiver, a moving average filter is used to filter the received signal, which reduces the BER of the system. The BER of the system is derived in the additive white Gaussian noise channel and Rayleigh fading channel, and Monte Carlo simulation is carried out to verify the performance. The results show that the system has better BER performance than PCSK system, which is conducive to the application of chaotic communication in practical engineering.