Space-time coded CDMA: blind equalization and multiuser detection

The blind multiuser detection problem for asynchronous direct sequence code division multiple access (DS-CDMA) systems operating in a multipath environment using multiple transmit and receive antennas is considered. The Alamouti space-time block code (STBC) for two-transmit-antenna configuration is adopted. Using only the spreading code of the desired user, a blind minimum mean square error (MMSE) detector is obtained without explicit channel estimation. Corresponding batch and adaptive algorithms are developed. Simulations verify the effectiveness of the proposed method.