An interference suppression scheme with joint channel-data estimation

This paper describes an adaptive space-time receiver with joint channel-dat a estimation (JCDE) to combat time-varying (TV) multipath channels in the p resence of undesired cochannel interference (CCI), The receiver uses a colo red Gaussian metric for sequence detection in order to suppress the CCI, Th e proposed scheme also uses the knowledge of the transmit filter for improv ed channel estimation to enhance performance, The algorithm is derived as a quasi-Newton scheme on a chosen cost criterion and is also locally converg ent. The performance of this class of interference cancellers is examined t hrough the pairwise error probability (PEP). Through these expressions we g ain insight into the properties of the canceller. The effect of channel dyn amics and identification mismatch on the PEP is also examined. To reduce im plementational complexity, a hybrid delayed-decision feedback and JCDE sche me is also proposed, The performance is illustrated using numerical results in realistic transmission environments.