Joint channel-data estimation with interference suppression

Abstract

This paper describes an adaptive space-time receiver with joint channel and data estimation (JCD) to combat time-varying multipath channels in the presence of undesired co-channel interference (CCI). The receiver uses a colored Gaussian metric in the sequence detection to suppress the CCI. The proposed scheme also uses the knowledge of the transmit filter for improved channel estimation to enhance the performance. We gain insight into the interference suppression scheme through pairwise error-probability analysis. To reduce implementational complexity, a hybrid delayed-decision feedback and JCD scheme is also proposed. The performance is illustrated using numerical results in realistic transmission environments.