Study on Number of Selected Antennas for BD Based Massive MIMO Considering K-Factor

Massive multi-user multiple input multiple output (MU-MIMO) improves the system channel capacity by facilitating transmissions between a base station and multiple user terminals (UT). Block diagonalization (BD) has been proposed to realize MU-MIMO in the downlink. An antenna selection method has been proposed that improve the characteristics of the BD algorithm by reducing the number of antennas used by the user (BD-AS). In this paper, the optimal number of selected antennas in the proposed method is investigated when K-factor is given in Nakagami-Rice fading environment.