AMOUR - Generalized multicarrier transceivers for blind CDMA regardless ofmultipath

Suppression of multiuser interference (MUI) and mitigation of multipath eff ects constitute major challenges in the design of third-generation wireless mobile systems. Most nide-band and multicarrier uplink code-division multi ple-access (CDMA) schemes suppress MUI statistically in the presence of unk nown multipath. For fading resistance, they all rely on transmit- or receiv e-diversity and multichannel equalization based on bandmidth-consuming trai ning sequences or self-recovering techniques at the receiver end. Either wa y, they impose restrictive and difficult to check conditions on the finite- impulse response channel nulls. Relying on block-symbol spreading, we desig n a mutually-orthogonal usercode-receiver (AMOUR) system for quasi-synchron ous blind CDMA that eliminates MUI deterministically and mitigates fading r egardless of the unknown multipath and the adopted signal constellation. AM OUR converts a multiuser CDMA system into parallel single-user systems rega rdless of multipath and guarantees identifiability of users' symbols withou t restrictive conditions on channel nulls in both blind and nonblind setups . An alternative AMOUR design called Vandermonde-Lagrange AMOUR is derived, to add flexibility in the code assignment procedure. Analytic evaluation an d preliminary simulations reveal the generality, flexibility and superior p erformance of AMOUR over competing alternatives.