Performance evaluation of sparse channel estimation for massive MIMO in LOS and NLOS environments

Abstract

Recently, a channel estimation method using channel sparsity in beam space has been studied. This method, which is called beam space channel estimation (BSCE), is effective for massive multiple-input multiple-output (MIMO) systems because a larger number of antennas makes channel responses in beam space sparser. However, each of previous studies has used a specific channel model for evaluating the performance of BSCE although the channel model affects the performance. In this paper, we compare the performance of BSCE between line-of-site (LOS) and non-LOS (NLOS) environments and clarify the effect of the difference in the channel sparsity on the performance.