短参多进制保密差分混沌键控系统

相对于传统差分混沌键控(differential chaos shift keying, DCSK)系统,短参考DCSK(short reference DCSK, SR-DCSK)系统在一定程度上提升了传输速率和能量利用率,但安全性能降低。针对该问题,提出了一种短参多进制保密DCSK(short-reference M-ary security DCSK, SRMS-DCSK)系统。该系统使用置乱矩阵和移位矩阵构造置乱矩阵组,使置乱矩阵在提高混沌信号保密性的同时还能携带多进制比特信息,这不仅能提高系统的安全性,同时也能进一步提升能量利用率。SRMS-DCSK系统的性能提升通过与同类型的系统进行对比得到验证。采用高斯近似法推导了不同信道下误比特率(bit error rate, BER)的解析表达式,并在仿真对比中得到验证。

Short-reference M-ary security differential chaos shift keying system

Compared with the traditional differential chaos shift keying (DCSK) system, the transmission rate and energy utilization rate is improved by the short reference DCSK (SR-DCSK) system to a certain extent, but which reduces its security performance. To solve this problem, the short reference M-ary security (SRMS-DCSK) system is proposed. In this scheme, a scrambling matrix group is constructed by the scrambling matrix and the shift matrix, so that the scrambling matrix can not only improve the security of the chaotic signals, but also carry the multi-level bit information, which can not only improve the security of the system, but also further improve the energy utilization. The performance improvement of the SRMS-DCSK is verified by comparing with the same type of system. The analytic expressions of bit error rate (BER) in different channels are derived by using the Gaussian approximation method, and which is verified by simulation.