IEEE TRANSACTIONS ON COMMUNICATIONS (SUBMITTED) All-Digital Uni cation and Equalization of Generalized Multi-Carrier CDMA through Frequency-Selective Uplink Channelsy

Relying on block-symbol spreading and judicious design of user codes, this paper builds on a recently proposed Generalized Multicarrier (GMC) quasi-synchronous CDMA system that is capable of multiuser interference (MUI) elimination and intersymbol interference (ISI) suppression with guaranteed symbol recovery, regardless of the wireless frequency selective channels. GMC-CDMA aaords an all-digital unifying framework which encompasses single-carrier and several multicarrier (MC) CDMA systems. Besides the unifying framework it is shown that GMC-CDMA ooers exibility not only in full load (maximum number of users allowed by the available bandwidth), but also in reduced load settings. A novel blind channel estimation algorithm is also derived. Analytic evaluation and simulations illustrate the superior performance and exibility of uncoded GMC-CDMA over competing MC CDMA alternatives especially in the presence of uplink multipath channels.