| Chaos is a convinced and random course that appears in the nonlinear system. It is also a nonperiodic and irregular course. It is not convergence but have a bound, while it is sensitive to its initial value. For all these special performance, chaos has an excellent outlook in the field of spread spectrum communication and secure communication.First of all, the paper has a deep discuss about chaos theory and analyses its basic concept and property, next, which simply introduces the application of chaos in the communication technology.In the second chapter, the paper expatiates to some typical chaotic sequences and two kinds of advanced chaotic sequences that mostly are their defines and statistic properties .in the last of the chapter, which gives the scheme of chaotic sequence about excellent choice.According to the notion of serial sequence, the paper brings forward a new chaotic sequence in the third chapter and gives its spectrum, correlation property, and then which has a test for its statistic property when parameters change using monte carlo method. Finally, it compares the pseudorandom property with other chaotic sequences, and gets a satisfying outcome.In the fourth chapter, the paper studies chaotic sequences on the MATLAB's simulink platform, mostly analyses bit error rate of different kinds of chaotic spread spectrum sequence in MAI environment. The feasibility of chaotic spread spectrum technology used to DS-CDMA has been greatly proved.Chaotic synchronization technology has important meaning for chaotic spread spectrum and secure communication, the fifth chapter pays attention to introduce it. At the beginning, it introduces some typical chaotic synchronization methods, which includes their rationales and simulation examples, then has a comparison to them. In the end, the paper mostly analyses and researches two kinds of advanced Chaotic synchronization methods.In the last, we summarize all the paper and forecast the next work. |
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