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Application of Zero Correlation Zone Sequences in Quasi-synchronous CDMA Systems

Qi Li

Abstract

In a quasi-synchronous code division multiple access(QS-CDMA) system, the correlation functions around the origin influence the system performance and odd functions are as important as the even functions. Three kinds of zero correlation zone(ZCZ) sequences are used to analyze and compare the correlation functions. Binary phase shift keying(BPSK) simulations of QS-CDMA system with the three kinds of QS sequences as spreading codes on additive white Gaussian noise(AWGN) channel show that these sequences are quasi-orthogonal, so they are suitable for QS-CDMA system. The correlation between the system performance and the zero correlation zone of the sequence is also proved.

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Key concepts: Code division multiple access, Additive white Gaussian noise, Phase-shift keying, Algorithm, Synchronous CDMA, Correlation function (quantum field theory), Correlation, Chip