中文摘要：

克服了由多径效应引起的符号内和符号间干扰，并且尽可能获得多径能量，对传统的差分混沌键控（DCSK）系统加入了保护时间间隔，提出了一种改进的DCSK系统．利用TMS320C5402DSP实现了加性高斯噪声（AWGN）信道下、多径信道下DCSK系统仿真和多径信道下改进DCSK系统的仿真．和改进前相比，在多径信道下，改进的DCSK系统不仅可以克服多径效应，而且还可以获得和AWGN信道下相似的误码性能．

英文摘要：

In order to overcome intra - symbol and inter - symbol interferences induced by muhipath effect and capture more muhipath energy, some protecting time space was added to the traditional differential chaos shift keying （DCSK） model, and an improved DCSK system was proposed. By using TMS320C5402DSP, DCSK system simulations were made in Add White Gaussian Noise （AWGN） channel and muhipath channel model, and an improved DCSK system simulations were made in muhipath channel model. Analysis and simulation results show that compared to traditional DCSK system, the improved DCSK system can better overcome multipath effect in muhipath channel mode and obtain similar BER performance in AWGN channel model.