无信号内干扰的MAMU-CDSK混沌通信系统

MAMU-CDSK chaotic communication system with no intra-signal interference

针对相关延迟键控(correlation delay shift keying,CDSK)系统误码性能差的缺点,提出无信号内干扰的多进制多用户CDSK(multiple ary multiple user CDSK with no intra-signal interference,NISI-MAMU-CDSK)混沌通信系统。该系统能够传输多个用户的数据信息,并将各个用户的数据信息由二进制码元经分组后映射为多进制码元,同时通过编码一组相互正交的Walsh码序列来代替CDSK系统的延迟结构,使得解调时能够消除信号内干扰。推导了在加性高斯白噪声信道和Rayleigh衰落信道中的误码率公式并进行了蒙特卡罗仿真实验。理论分析与仿真结果表明:NISI-MAMU-CDSK系统有效提高了误码性能和传输速率,在混沌通信领域有很好的实际应用价值。

For existing defects of poor error performance in correlation delay shift keying(CDSK),a chaotic communication scheme named multiple ary multiple user CDSK with no intra-signal interference(NISI-MAMUCDSK)is proposed.According to the multiple users’ data information in transmission,the scheme makes each user’s binary data symbol grouping and mapping for multiple ary symbol.At the same time,the delay structure of the CDSK system is replaced by encoding a set of mutually orthogonal Walsh code sequences to eliminate the intra-signal interference during the demodulation.The bit error rate(BER)formula over additive white Gaussian noise(AWGN)channel and Rayleigh fading channel is derived and Monte-Carlo simulation experiments are worked.Theoretical analysis and simulation results show that the new scheme proposed can effectively improve bit error rate performance and transmission rate,which indicates good practical application feasibility in the chaotic communication field.