A Two-Stage Receiver with Soft Interference Cancellation for Space-Time Block Code and Spatial Multiplexing Combined Systems

This paper presents a new space-time two-stage receiver with the assistance of soft information for the Alamouti space-time block code (STBC) and spatially multiplexing (SM) combined systems. The first stage of the receiver consists of a set of soft generalized sidelobe canceller (GSC)-based detectors, each for every STBC group and is intended to yield a more precise initial estimate of the transmitted symbols. In the second stage, the groupwise detection is conducted successively using the matched filters (MF) with the removal of the soft interferences in between. Conducted simulations show that the developed receiver, with modest computational load, can provide superior performance compared with pervious works, especially in multiple user (MU)downlink MIMO scenarios.