METHOD AND APPARATUS FOR SHORT SPREADING IN A CODE DIVISION MULTIPLE ACCESS COMMUNICATION SYSTEM

摘要

The invention describes a method and apparatus for hopping the short spreading code assigned to each user in a Direct-Sequence Spread-Spectrum (DS-SS) Code Division Multiple Access (CDMA) communications system. The sequence of short spreading codes employed by each user is determined by a pseudo-random hashing function (310). The set of short spreading codes (304) available to each user is drawn from one of (possibly) several disjoint sets of short spreading codes made available to a cellular communication system. The sequence of short spreading codes employed by each is ensured unique by assignment of a user-specific hashing function key (11).