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中文摘要：
差分混沌键控（DCSK）的输出信号具有固有的抗噪声以及宽频特性，由于其采用非相干解调技术，不必在收发两端建立同步，相比传统通信系统有很多优势。但其传输速率较低、保密性差。针对上述问题，提出一种改进型DCSK保密通信系统。该系统将信息分散于两个正交信道中传输，不仅保证了传输速率而且提高了安全性。理论分析和仿真结果证明，改进型DCSK保密通信系统较原系统性能有极大的提高。
英文摘要：
The output signals of differential chaos shift keying have the inherent anti-noise and broadband characteristics. DCSK has many advantages compared with the traditional communication systems because it adopts incoherent demodulation technology and there is no need to establish synchroniza- tion at both sides. It has, however, low transmission rate and poor security. An improved DCSK secure communication system is proposed in this paper for the above problems. In the new system, the information is dispersed in two orthogonal channels and transmitted. Therefore not only the transmission rate is raised but also the security is improved. Theoretical analysis and simulation results indicate that the performance of the improved DCSK secure communication system greatly improved compared with the previous system.
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