User Selection Scheme Based on the Projection Matrix

Abstract

Key Words : user selection, MU-MIMO, projection matrix, Frobenius norm, sum rate. ABSTRACTIn this paper, we describe a greedy user selection scheme for multiuser multiple-input multiple-output ( MIMO) systems. We propose a new metric which has significantly improved performance compared to the Frobenius norm metric. The approximation of projection matrix is applied to increase the accuracy of Frobenius norm of effective channel matrix. We analyze the computational complexity of two metrics by using flop counts, and also verify the achievable sum rate through numerical simulation. Our simulation result shows that the proposed metric can achieve the improved sum rate as the number of user antenna increases.