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

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 zeroforcing (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.