The Synchronization Research And Application On Hyper Chaos System

Chaotic synchronization is the key issue of chaotic communications,which is one of the leading domains in modern communication technologies.Topics which have been studied include research of the chaos resource, chaotic modulation for transmission of information, chaotic spreading codes for multi-user access in spreading spectrum system, chaotic encryption for security. More specifically, this dissertation focuses mainly on the former two topics.In chaotic modulation scheme, chaotic signals are used to substitute the sine carrier basis functions and they have a few advantages over traditional approaches. Chaotic signals have continuous wide-band spectra and are non-periodic and more difficult to predict, reconstruct and characterize than periodic carriers. On the other hand, since the hyperchaos system is characterized by more complicated kinetic behaviors, the super dimension hyperchaos system which implies many Liyaprov index, makes chaotic modulated signals more robust to interference, more difficult to interrupt and decode.In this dissertation, we summarize various chaotic modulation modes and analyze the possibility of highly improvements for the time, coupling coefficient of synchronization and key synchronization which are required when we feedback one variable to two equations by utilizing the linearity feedback method.The key reason why the chaos synchronization research becomes one hotspot nowadays is that this research is the sticking point of the hyper chaotic communication. Chaos synchronization is the foundation stone of chaotic communication, and with every new method putting forward, we are able to get original revelations in our research. We also give some definitions for analyzing and describing some characters of chaotic mapping and mathematical tools in the letterpress.Most of the researches of chaotic synchronization at present aim at time chaos (three-dimensional chaotic system), which is a low dimensional chaotic system with a up-zero Liyaprov index. In the letterpress, the linearity feedback method is discussed under the condition it is synchronously applied in hyper chaotic dynamics in communication with many up-zero Liyaprov index. According to the effect of imitation, it will be much faster when the multi variable feedback method is taken to realize the synchronization of both sides in hyper chaotic dynamics in communication...