Domain Decomposition Based PIC Detectors for Massive MIMO

Abstract

In this work, we investigate the use of domain decomposition techniques in developing novel block-wise PIC detectors for communication systems. Specifically, we consider the cancellation of inter-antenna-interference in the uplink of massive MIMO systems and develop a new block-wise PIC detector based on additive Schwarz method. Up to our knowledge, this is the first time domain decomposition techniques are applied within the wireless communication field. Careful inspection of the channel cross-correlation matrix reveals the fact that the latter has a special structure which supports the use of block iterative methods. We exploit this fact and develop a block-wise PIC detector that is suitable for implementation on parallel processors. Convergence analysis and the impact of various parameters such as the level of overlap and the number of blocks on the convergence behavior of the novel PIC detector are considered. Simulation results show important improvement in convergence speed compared to the conventional linear PIC detector.