Abstract: In this paper, a diversity reception and inverting demodulation scheme for DCSK in Rayleigh multipath fading channels is proposed. In the scheme, transmitting signals are delayed appropriately to generate multi-channel signals, and then addition and reverse operation are performed on them. And the receiver end makes decisions according to the operation results. Theoretical analysis and simulation results show that DCSK communication system based on the diversity reception and inverting demodulation scheme makes some improvement, compared with the classical DCSK communication system. Also, it can effectively suppress noise.

Key words: Differential Chaos Shift Keying（DCSK） communication system, chaos communication, diversity reception, inverting demodulation, noise

摘要： 提出一种瑞利多径衰落信道下DCSK通信系统的分集接收及反相解调的方案。该方案将发射信号做适当延时以形成多路信号，将各路信号相加后进行反相相关运算，接收端以运算后的结果作为门限做出判决。理论分析和仿真结果表明，和原DCSK通信系统相比，使用了分集接收反相解调方案的DCSK通信系统有所改善。此外，该系统可有效抑制噪声的影响。

关键词: 差分混沌相移键控（DCSK）通信系统, 混沌通信, 分集接收, 反相解调, 噪声