| Behavior of the chaos system may be not the foresight, and is the intrinsic randomness for the initial value sensitivity, which can be used to hide signal in the security communication. Communication based on chaos has strong time and secrecy higher. However, the research on chaos communication system is still few.At present, there are many subjects to improve and to study further. Simultaneously, the realization of chaos synchronized has provided the rationale for the chaos security communication.This thesis, at the beginning, introduces the basic theory of chaos and Mathematical model. Then we analyze the modulation manner of Chaos Shift Keying system. We analyze the Differential Chaos Shift Keying(DCSK), propose a novel scheme of DCSK. Using new scheme, the Bit Error Rate of DCSK was improved in some decent. Secondly, we analyze the Quadrature Chaos Shift Keying (QCSK), then introduces the jamming into the channel, we analyze the anti-jamming performance of QCSK and propose a scheme of multiply access QCSK. The simulation result is consistent to that of the theory analysis. Finally, the definition of chaotic synchronization and the current situations of the chaotic synchronization are introduced. The methods of chaotic synchronization and their characteristic are analyzed. Based on this, the sufficient conditions for global exponential synchronization of a class of chaotic neural networks are proposed, analyzed this chaos system synchronization stability. Finally, some chaotic neural networks with time-varying delays are given as examples for illustration. |
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