利用移动键控和耦合超混沌系统实现异步十六进制数字保密通信系统

为提高混沌移动键控方案的通信效率，提出基于移动键控和耦合超混沌系统的异步保密通信方案。在发送端，将十六进制信号嵌入到增益后的混沌状态变量中，利用转换器控制模块实现多个状态变量交替变换掩盖信号，经添加高斯噪声后发送出去。在接收端通过检测噪声强度动态调整检测阈值，可成功提取出发送的信号。数值模拟验证了该系统在含噪声信道环境下，双方通过自适应调整混沌信号增益实现保密通信，随着信噪比（SNR）的增加，比特误码率（BER）呈平滑降低趋势，确保了系统的稳定性。

Asynchronous hexadecimal digital secure communication system based on shift keying of coupled hyperchaotic systems

To improve the communication efficiency of shift keying, an asynchronous secure communication scheme was proposed based on shift keying and coupled hyperchaotic systems. In the sender, hexadecimal digital signal was embedded into gained state variables, and the original signal was masked alternately through converter control module, then was sent out after adding Gaussian noise. In the receiver, the signal could be extracted successfully through adjusting the threshold dynamically. Numerical simulation verifies that under the condition of channel with noise, the sender and the receiver can securely communicate successfully, the Bit Error Ratio (BER) reduces smoothly with the increase of Signal-to-Noise Ratio (SNR), through adjusting the gain of chaotic signals adaptively, which ensures the stability of the proposed communication system.