Adaptive Channel Estimation and Tracking for URA-Based Massive MIMO Systems

In this paper, an adaptive channel estimation and tracking method is proposed for the null uniform rectangular array null (URA) based null massive multiple-input and multiple-output null (M-MIMO) systems. To decrease the computational complexity while tracking the change on the null channel state information null (CSI) in time, a null principal subspace analysis null (PSA) based scheme is proposed to estimate and track the signal subspace based...