2002•Chinese Journal of Radio ScienceRequires access

The optimization of quaternary chaotic spreading sequences and system simulation

Qi Zhang

Abstract

In terms of characteristics of asynchronous CDMA system with complex processing and quaternary data modulation, this paper summarizes the property analysis criteria of quaternary spreading sequences, based on which the optimization of chaotic sequences is presented. The size of optimized chaotic sequences set is large and each element's weight is balanced. Monte Carlo simulations in A CDMA system with complex processing and quaternary data modulation are carried out on AWGN channel, where chaotic sequences and one kind of quasi optimum quaternary sequences are employed to spread spectrum respectively. The simulation results show that the optimized chaotic sequences' ability to restrain multiple access interference is close to that of the quasi optimum quaternary sequences, and the ability to restrain intersymbol interference is much better.

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Key concepts: Chaotic, Interference (communication), Quaternary, Algorithm, Computer science, Modulation (music), Asynchronous communication, Set (abstract data type)