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Blind and group-blind multiuser detection in colored noise

The problem of adaptive suppression of both multiple-access interference (MAI) and intersymbol interference (ISI) in a dispersive CDMA channel is considered. A subspace-based group-blind technique for this purpose is developed, which blindly suppresses the interfering signals from other cells, while jointly detects the signals within the cell of interest. This technique is extended to the situation where the channel ambient noise is correlated. In this case, two antennas are needed at the receiver for channel estimation and signal separation.