Performance comparison of full-dimension MIMO systems with different base station places

Abstract

Studies on a massive Multiple-Input Multiple-Output (MIMO) system have been studied in recent years. In a massive MIMO system, antenna elements are arranged not in one dimension but in two dimensions because very large number of antenna elements are used, and the system is called a full-dimension MIMO. In this paper, we generate channel matrices between a transmitter at a base station and user equipments by using a ray tracing technique and evaluate the channel capacity with different places of a transmit antenna array in an indoor environment. In addition, we introduce block SNR maximization and compare the performance with that of block diagonalization. Sum capacity in the case when the BS is placed at the ceiling is larger than one in the case of placing at the wall.