摘要
多用户和多进制差分混沌移位键控因可有效提高通信速率而得到广泛研究,但传统的多用户多进制差分混沌移位键控采用多电平实现多进制通信,存在误码率高的缺陷,因此提出了一种基于相移键控的多用户多进制差分混沌移位键控方案。利用星座点上的相位来代表多进制信息,星座点对应的两路分量分别调制正交的混沌载波序列,并采用沃尔什码区分不同的用户。推导了该方案在高斯白噪声信道下的理论误码率并进行了蒙特卡洛仿真。仿真结果表明,仿真值和理论上推导的误码率一致,当传输数据量小且保证同样的传输速率下,误码率要求为10-4时,本方案所需的比特信噪比比现有的保密系统少6 dB。因此,该方案可明显降低误码率,在混沌保密通信领域具有很好的应用前景。
Multi-user and M-ary differential chaos shift keying can effectively improve the communication rate and have been widely studied. However, the traditional multi-user M-ary DCSK uses multilevel to implement M-ary communication, which has the defect of high bit error rate. A multi-user M-ary differential chaos shift keying scheme based on phase shift keying is proposed. The phases of the constellation points are used to represent M-ary information. The corresponding two-way components of the constellation point respectively modulate the orthogonal chaotic carrier sequence and Walsh codes are used to distinguish different users. The theoretical bit error rate of the scheme under Gaussian white noise channel is derived and Monte Carlo simulation is performed. The simulation results show that the simulation values are consistent with theoretical values and the bit signal to noise ratio required by this scheme is 6 dB less than that of the existing security system when the amount of transmitted data is small and the bit error rate requirement is 10-4 at the same data transmission rate of the senders. Therefore, this scheme can significantly reduce the bit error rate and has a good application prospect in the field of chaotic secure communication.
作者
李志伟
田茂
谢桂辉
Li Zhiwei;Tian Mao;Xie Guihui(Electronic Information School,Wuhan University,Wuhan 430072,China;College of Automation,China University of Geosclences (Wuhan),Wuhan 430074,China;Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems,Wuhan 430074,China)
出处
《电子测量技术》
2018年第23期18-22,共5页
Electronic Measurement Technology
基金
中国地质大学(武汉)中央高校基本科研业务费专项资金项目(CUG160834)资助
关键词
多用户
多相
差分混沌移位键控
误码率
multi-user
multi-phase
differential chaos shift keying
bit error rate
