Approximate Message Passing Detector for Phase-Shifter-Aided Spatial Multiplexing.

Phase-shifter-aided spatial multiplexing (PSSM) is a low-complexity multiple-input multiple-output (MIMO) technique with the assistance of extra phase shifters. Following the basic structure of the PSSM transmitter, in this contribution, a message passing detector tailored for PSSM systems is developed, and is further simplified according to the paradigm of approximate message passing (AMP). Analytical and simulation results confirm that the proposed detector significantly outperforms the linear detectors and strikes a good balance between system performance and computational complexity, compared to its maximal likelihood (ML) counterpart.