AMOUR-generalized multicarrier transceivers for blind CDMAregardless of multipath
Giannakis, G.B.; Wang, Z.; Scaglione, A.; Barbarossa, S.
Communications, IEEE Transactions on
Volume 48, Issue 12, Dec 2000 Page(s):2064 - 2076
Digital Object Identifier 10.1109/26.891217
Summary:Suppression of multiuser interference (MUI) and mitigation of
multipath effects constitute major challenges in the design of
third-generation wireless mobile systems. Most wide-band and
multicarrier uplink code-division multiple-access (CDMA) schemes
suppress MUI statistically in the presence of unknown multipath. For
fading resistance, they all rely on transmit- or receive-diversity 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
finite-impulse response channel nulls. Relying on block-symbol
spreading, we design a mutually-orthogonal usercode-receiver (AMOUR)
system for quasi-synchronous 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 single-user systems regardless of
multipath and guarantees identifiability of users' symbols without
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 and preliminary simulations reveal the generality,
flexibility, and superior performance of AMOUR over competing
alternatives
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