基于混沌的扩频通信

Chaosbased Spread Spectrum Communication

针对混沌信号具有的随机性、宽带性、似噪声以及对初始条件的极端敏感性的特点，本文用混沌序列取代扩频通信系统中的伪随机码，在提出并实现一种混沌网络同步化法的基础上，实现了语音、文字和图像的码分多址的扩频通信。用Ｌｏｒｅｎｚ混沌系统对同步和通信的仿真结果表明了本文所述方法的有效性和可靠性。进一步指出了这种通信方式具有简便性和自然的保密性的优点。

Based on the randomness,broadband frequency spectrum,noiselike and extreme sensitivity to initial conditions of chaotic signal,pseudo random codes in spread spectrum communication systems are replaced with chaotic sequences in this paper.After a chaotic network synchronization scheme is proposed and realized,the spread spectrum communications with code division multiple access (CDMA) are realized with speech,characters and image.The synchronizations and communications' simulation results with Lorenz chaotic systems demonstrate that the proposed approaches are of effectiveness and reliability.Further,it is pointed out that the methods are of the merits of convenience and natural security.