On the Uplink Detection Performance in Large Scale MU-MIMO Systems with Different Scenarios

Abstract

In this paper, a very large-scale antenna Multiple input multiple output (MIMO) system to accommodate multi users is considered in a single cell uplink scenario. Each user has a single antenna and all the users are uniformly distributed in the cell. Maximum Ratio Combining (MRC) and Zero forcing (ZF) linear detectors are considered at the base station (BS). Uplink achievable rate performance over Rayleigh fading channel has been evaluated considering both the channel certainty and channel uncertainty conditions. The effect of the power scaling on the achievable rate performance of the two linear receivers has also been investigated. The comparative analyses on the uplink achievable rate of MRC detector with ZF detector have been discussed. Simulation results show that the increase in the number of users will result in increasing the gap between the two detectors performance. Performance in terms of Average Bit Error rate (ABER) of the linear detectors in large-scale MIMO has been also evaluated by considering only the channel certainty condition. The effect of increasing the antenna count and average transmit power on the ABER in the uplink scenario have been considered, as well.