Expected Error Based MMSE Detection Ordering for Iterative Detection-Decoding MIMO Systems

In multiple-input multiple-output (MIMO) systems, iterative receiver with turbo processing between detection and decoding can achieve near-capacity performance. This paper introduces detection ordering into conventional soft interference cancellation minimum mean square error (SoIC-MMSE) detector which cancels the interference and detect signals in a 'parallel' manner. With soft information feedback, a novel expected error based (EEB) ordering algorithm is proposed and applied to quadrature amplitude modulation (QAM) signaling. Simulation results show that with a little complexity increase in one turbo iteration compared to the conventional SoIC-MMSE detection, our algorithm needs less iteration to achieve better performance.