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利用时间连续的混沌系统进行保密通信时 ,信道中传输的是宽带的混沌信号 ,由于实际的信道总是带限的 ,这就大大的限制了混沌在通信中的应用。一种改进的方法是在发射端用滤波器滤去混沌信号的高频部分 ,只传输低频部分。而在接收端用本地产生的混沌信号的高频部分来补偿接收到的信号作为接收端混沌系统的驱动信号。文中提出的方法是在发射端对要发射的混沌信号进行采样 ,只传输这些时间离散的采样值。在接收端则用本地产生的采样时间以外的混沌信号来补偿收到的采样值。由于采样信号可以通过数字调制成为带限信号 ,因此可以在有限带宽内进行传输。仿真结果证明 ,这种方法可以保证混沌同步 ,从而可以用于保密通信。
The use of chaotic time continuous communication system for confidential communications, the channel is transmitted broadband chaotic signal, the actual channel is always band-limited, which greatly limits the application of chaos in communications. An improved method is to filter out the high-frequency part of the chaotic signal by the filter at the transmitting end, and only transmit the low-frequency part. While the receiving end compensates the received signal as the driving signal of the chaotic system on the receiving end by using the locally generated high frequency part of the chaotic signal. The proposed method is to sample the chaotic signal to be transmitted at the transmitting end and only transmit the discrete samples at these times. The receiving end compensates for the received sample with a chaotic signal outside the locally generated sample time. Because sampled signals can be digitally modulated into band-limited signals, they can be transmitted over a limited bandwidth. Simulation results show that this method can ensure the synchronization of chaos, and thus can be used for secure communication.