多用户正交多级差分混沌键控通信系统

针对传统差分混沌键控(differential chaos shift keying, DCSK)采用多电平方式传输多进制信息导致误比特率(bit error rate, BER)高的缺点,提出一种多用户正交多级DCSK(multi-user orthogonal multi-level DCSK, MOM-DCSK)通信系统。该系统将传输的多进制信息映射为不同的传输系数,多个传输系数分别乘以对应的Walsh码后调制在信息承载信号上,并且通过不同的延时传输多用户信息。在加性高斯白噪声(additive white Gaussian noise, AWGN)信道和多径Rayleigh衰落信道中推导了系统的理论BER公式并进行了仿真分析。结果显示，该系统在传输多进制信息时拥有较好的误码性能,并且在多用户传输领域中有较好的实际应用价值。

Multi-user orthogonal multi-level differential chaos shift keying communication system

Aiming at the shortcomings of high bit error rate (BER) caused by the multi-level mode transmission of multi-ary information in the traditional differential chaos shift keying (DCSK) system, a multi-user orthogonal multi-level differential chaos shift keying (MOM-DCSK) communication system is proposed. The system maps the transmitted multi-ary information into different transmission coefficients, and the multiple transmission coefficients are multiplied by the corresponding Walsh code and modulated on the information bearing signal, which can transmite multi-user information through different delays. The BER formula of the system in the additive white Gaussian noise (AWGN) channel and the multi-path Rayleigh fading channel is derived, and the simulation analysis is carried out. The results show that the system has better bit error performance when the multi-ary information is transmitted, and has a good practical application value in the field of the multi-user transmission.