A Robust Study of Spectral Efficiency for Space Constrained Massive Mimo System

Spectral efficiency (SE) of massive multiple-input multiple output (MIMO) systems with a very large number of antennas at the base station (BS) considering for space constraint antennas are investigated in this paper. In literature, fixed spacing inter-element were considered, the number of antennas increases with a fixed total distance in a practical topology an inversely proportional to inter antennas spacing decreases. In this paper, we attain exact and approximate values of lower and upper limits for the SE of massive MIMO system with linear receiver such as MRC, ZF and MMSE. Simulation results show that the SE increasing as the number of antennas increases at BS using ZF and MMSE where as MRC is sub optimal for space limit in massive MIMO. Numerical results conclude that the effect of the large number of antennas, the number of users and the total space of the antenna array on the sum SE performance.