Blind multiuser detection for frequency-selective fading CDMA channels

Linear multiuser detectors for frequency-selective fading CDMA channels are examined within the context of multidimensional adaptive filtering. A blind adaptive multiuser detector, which can suppress multiple-access interference and achieve multipath diversity gain simultaneously, is then proposed. A channel estimator (carrier recovery) for a coherent diversity combining is also presented. The only information required by the proposed detector is the signature and timing of the user of interest. It is shown that the proposed detector outperforms the decorrelating solution and is comparable to the minimum mean-squared-error solution even though the later two require more information.