Abstract
AbstractIn this article, we review some polyphase sequences and investigate their correlation properties and corresponding applications to cellular direct sequence code division multiple access (DS/CDMA) systems. We first consider several polyphase sequences which have perfect even autocorrelation properties and thus can be used as the long spreading sequences in intercell synchronous cellular DS/CDMA systems. We then consider some polyphase sequences possessing (near) optimum even correlation functions. These (near) optimum sequences are appropriate as the long spreading sequences in intercell asynchronous cellular DS/CDMA systems. Description of the polyphase sequences are given next which have perfect even crosscorrelation properties and thus are useful as the short signature (channelization) sequences in cellular DS/CDMA systems, followed by a brief consideration of other polyphase sequences.
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