Performance of quadrature spatial modulation with imperfect channel information over correlated α-μ fading channels

In this paper, we analyze multiple-input multiple-output quadrature spatial modulation (QSM-MIMO) systems that operate under imperfect channel information over correlated α-μ fading channels. A simple and closed-form expression for the pairwise error probability (PEP) is provided. Based on the obtained PEP, a closed-form upper bound expression for the average bit error probability (BEP) is obtained. The obtained results clearly show the effect of the fading parameters on the average BEP. In case of the α-μ fading channels, increasing a has larger negative impact on the average BEP compared to increasing μ. In addition, the results demonstrate that the correlation coefficient of the transmit-antennas significantly deteriorates the average BEP when compared to the correlation coefficient of the receive-antennas.