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Equalisers can provide significant improvement in the performance of CDMA-based systems such as UMTS. Naturally, the level of improvement introduced depends on the employed equalisation technique. Reported are the results of an investigation into the performance of a Kalman-based channel-estimator/equaliser for use in high speed downlink packet access (HSDPA) receivers. Also, the performances of the Kalman and the sliding window chip rate equaliser (SWCE) algorithms are compared.