Spectral Efficiency of Very Large Multiuser MIMO Systems for Time-Selective Fading

Abstract

This paper investigates the uplink asymptotic performance of single-cell multiuser multiple-input multiple-output(MU-MIMO) system with a very large antenna array for time-selective fading channels, resulting from user mobility. To exploit the temporal correlation of the channel, the Kalman filter (KF) is developed for channel estimation, followed by its asymptotic performance analysis. A lower bound on the uplink achievable rate is obtained in the asymptotic limit of a large number of time slots and a finite number of base station (BS) antennas for linear receivers, such as the maximum ratio combiner (MRC) and zero-forcing (ZF) receiver. In addition the pertinent power scaling law is also derived for a large number of antennas. Finally, simulation results are presented to validate the analytical results.