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Low Correlation Zone Sequences

It is well known that low correlation zone sequences have been adopted as spreading sequences in the quasi-synchronous code division multiple access (QS-CDMA) systems of wireless communication systems, where time delay among different users is allowed to be within a few chips. In this paper, numerical analysis shows that the QS-CDMA systems using low correlation zone (LCZ) sequences outperform the conventional code division multiple access (CDMA) systems. Also, several LCZ sequences are revisited and a new extension method for the construction of LCZ sequences is proposed.