一种基于正交调制的新型降噪差分混沌键控系统

A Novel Noise Reduction Differential Chaos Shift Keying System Based on Quadrature Modulation

针对降噪差分混沌键控(NR-DCSK)传输速率低的缺点,该文提出一种基于正交调制的新型降噪差分混沌键控(QM-NRDCSK)系统。发生器产生两路混沌序列,每一路的参考信号是信息承载信号的P次重复,不同用户信息通过不同时隙区分,两路信号使用正交调制在相同频带上传输。接收端通过滑动平均滤波器对每一路的参考信号进行P次平均后与信息信号进行非相干解调。通过在AWGN和多径Rayleigh衰落信道下的仿真,验证了理论推导的正确性,并表明该系统在具有较高频谱利用率的同时,能有效提高传输速率且拥有较好的误码性能。

To overcome the shortcomings of low transmission rate of Noise Reduction Differential Chaos Shift Keying(NR-DCSK),a novel Noise Reduction Differential Chaos Shift Keying system based on Quadrature Modulation(QM-NRDCSK)is proposed.The generator generates two chaotic sequences,the reference signal of each channel is P-time repetition of the information-bearing signal.The information of different users is distinguished by different time slots,and the two signals are transmitted on the same frequency band by using quadrature modulation.The reference signal of each channel is averaged P times by the moving average filter at the receiving end,and then non-coherently demodulated with the information signal.The correctness of the theoretical derivation is verified by simulations in AWGN and multi-path Rayleigh fading channels,and it shows that the system can effectively improve the transmission rate and has better bit error performance while having high spectrum utilization.