Detection Techniques for Direct Sequence & MulticarrierVariable Rate Broadband

| Multicarrier CDMA and direct sequence CDMA have been suggested for both narrowband and broadband multiple access systems. A series of concepts have further been proposed for variable rate broadband multimedia transmission within a CDMA system. These principally diierent techniques exhibit certain common characteristics that can be exploited. In this paper we propose a generalised unifying discrete-time model for describing both MC-CDMA, DS-CDMA and hybrid DS-MC-CDMA narrowband and variable rate broadband schemes. The model leads to a system description which is similar to the matrix algebraic formulation of a traditional DS-CDMA system. Performance enhancing multiuser detection techniques based on matrix algebra are suggested.