多用户多级降噪相关延迟移位键控通信系统

Multi-user multi-level noise reduction correlation delay shift keying communication system

提出了一种多用户多级降噪相关延迟移位键控(multi-user multi-level noise reduction correlation delay shift keying, MUM-NR-CDSK)通信系统.该系统将各个用户的多进制信息映射为不同传输系数,再通过不同载波携带经过Walsh码调制后的信息承载信号.在接收端加入滑动平均滤波器降低系统误码率,解决了多用户多进制调频差分混沌移位键控(MAMA-FM-DCSK)通信系统采用多电平方式传输多进制信息时存在的系统误码率较高及传输效率低等问题.仿真结果表明,与其他系统相比,MUM-NR-CDSK系统传输速率提高了8倍,误码性能提升了近9 dB,因此在实际应用中具有更大的价值.

A multi-user multi-level noise reduction correlation delay shift keying(MUM-NR-CDSK) communication system is proposed. The system maps the M-ary information of each user to different transmission coefficients, and then carries the message bearing signals modulated by Walsh code through different carriers. A moving average filter is added to the receiver to reduce the bit error rate of the system, which solves the problems of high bit error rate and low transmission efficiency when multiple-access M-ary frequency modulated differential chaos shift keying(MAMA-FM-DCSK) communication system adopts multiple electrical level mode to transmit M-ary information. Simulation results show that compared with other systems, the transmission rate of the MUM-NR-CDSK system is increased by 8 times, and the bit error performance is improved by nearly 9 dB, so it has greater value in practical application.