CHEMP receiver for large-scale multiuser MIMO systems using spatial modulation

In spatial modulation (SM), information bits are conveyed through the index of the active transmit antenna in addition to the information bits conveyed through conventional modulation symbols. In this paper, we propose a receiver for large-scale multiuser spatial modulation MIMO (SM-MIMO) systems. The proposed receiver exploits the channel hardening phenomenon observed in large-dimensional MIMO channels. It works with a matched filtered system model. On this system model, it obtains an estimate of the matched filtered channel matrix (rather than the channel matrix itself) and uses this estimate for detecting the data. The data detection is done using an approximate message passing algorithm. The proposed receiver, referred to as the channel hardening-exploiting message passing receiver for SM(CHEMP-SM), is shown to achieve very good performance at low complexity.