Parallel multiple candidate interference cancellation with distributed iterative multi-cell detection and base station cooperation

A novel cooperative interference mitigation strategy for an uplink cellular network with high frequency reuse factor is proposed in this paper. The cooperative base stations iteratively exchange their information among the neighbours while performing distributed signal processing. The base stations improve the estimate of the desired signal with each iteration and the exchanged information is used to regenerate the interference of the users from other cells. The interference is subsequently subtracted at the receiver resulting in an interference reduced signal. The exchange of soft information usually requires high communication bandwidth consumption of the network backhaul. In order to address this problem, we propose a strategy which exchanges only the hard information among the neighbours and a reliable hard interference cancellation procedure is introduced. The proposed algorithm is able to outperform the conventional soft cancellation based cooperation structure while requiring a reduced backhaul traffic.