A doubly iterative space-time nonlinear receiver with hybrid time-frequency domain processing for single-carrier MIMO systems

In order to effectively detect multiple signals in severe time-dispersive channels for single-carrier multiple-input and multiple-output systems (SC-MIMO), this letter proposes a novel space-time nonlinear receiver structure with hybrid time-frequency domain processing. The proposed receiver consists of an internal and an outer iteration (i.e., doubly iterative) parts together they can efficiently eliminate the interferences (both the co-antenna interference (CAI) and inter-symbol interference (ISI)) and at the same time consistently renew the desired signal. To demonstrate the advantage of the proposed structure, a mean-square error (MSE) analysis of the proposed receiver is performed. Furthermore, simulation results show that the proposed receiver significantly outperforms conventional linear and nonlinear receivers, and after convergence, its performance is close to the ideal case which assumes perfect cancellation of CAI and ISI.