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.