A Multiuser Noise Reduction Differential Chaos Shift Keying System

One of the major drawbacks of the conventional Multiuser Differential Chaos Shift Keying is the poor Bit Error Rate (BER), a MultiUser Noise Reduction Differential Chaos Shift Keying (MU-NRDCSK) system is proposed. At the transmitter, M/P chaotic samples are transmitted and then duplicated P times as a reference signal, all users share the same reference signal, and information signals are delayed by different times to distinguish different users. At the receiver, the received signal is averaged by a moving average filter, and then the resultant filtered signal is correlated to different time-delated replica. The scheme can enhance the performance of BER by reducing the variance of noise terms in the system. The theoretical BER formula of this new scheme is derived in Additive White Gaussian Noise (AWGN) channel and Rayleigh channel. Theoretical analysis and the simulation results show that the theoretical formula and the simulation result are in good agreement. The MU-NRDCSK scheme can enhance the performance of BER better and has good development prospects and research value in the chaotic communication field.