中文摘要：

为了解决扩频通信系统的同步问题,并研究混沌扩频通信系统的性能,介绍了混沌同步扩频通信系统的原理,采用混沌系统实现扩频通信系统接收端与发送端的同步,同时应用该系统产生扩频序列和解扩序列。然后利用SIMULINK仿真平台建立多用户混沌同步扩频通信系统仿真模型。最后研究了噪声对系统误码率的影响。仿真结果表明：信噪比大于-3 d B时,所有用户的误码率都能保持在10~（-3）以下,证明该系统有较好的抗噪声能力。

英文摘要：

In order to solve the synchronization problem of spread spectrum communication system and study the performance of chaotic spread spectrum communication system,the principle of chaotic synchronization spread spectrum communication system was proposed firstly. Chaotic systems is used to achieve synchronization of the spread spectrum communication system＇s receiver and sender. At the same time,this system could also generate spreading and despreading sequences. Next,the simulation model of multiuser chaotic synchronization spread spectrum communication system was built by SIMULINK simulation platform. Finally,the effect of noise on the bit error rate（ BER） was studied. The simulation results show that BER for all users can be maintained at 10~（- 3）in the condition of signal to noise ratio（ SNR） is larger than- 3 d B,which proves that the system has good noise immunity.