AMOUR-generalized multicarrier transceivers for blind CDMA regardless of multipath

Suppression of multiuser interference (MUI) and mitigation of multipath effects constitute major challenges in the design of thirdgeneration wireless mobile systems. Most wideband and multicarrier uplink CDMA schemes suppress MUI statistically in the presence of unknown multipath. For fading resistance, they all rely on transmitor receivediversity and multichannel equalization based on bandwidth-consuming training sequences, or, self-recovering techniques at the receiver end. Either way, they impose restrictive and difficult to check conditions on the FIR channel nulls. Relying on block-symbol spreading, we design A MutuallyOrthogonal Usercode-Receiver (AMOUR) system for quasi-synchronous (QS) blind CDMA that eliminates MUI deterministically and mitigates fading regardless of the unknown multipath and the adopted signal constellation. AMOUR converts a multiuser CDMA system into parallel singleuser systems regardless of multipath and guarantees identifiability of users’ symbols without restrictive conditions on channel nulls in both blind and non-blind setups. An alternative AMOUR design called Vandermonde Lagrange (VL) AMOUR is derived to add flexibility in the code assignment procedure. Analytic evaluation and preliminary simulations reveal the generality, flexibility, and superior performance of AMOUR over competing alternatives. Keywords— Multi-Carrier CDMA, multipath fading channels, blind equalization, multiple rates