Spectral Efficiency Maximization of Single Cell Massive Multiuser MIMO Systems via Optimal Power Control with ZF Receiver

This paper investigates the spectral efficiency of multiuser multiple-input multiple-output systems with a large number of antennas at the base station that serves single-antenna users in one cell. It is assumed that the base station estimates the channel with the help of uplink training and then employs the zero-forcing technique to detect the data signals transmitted by the various users. An optimal power control scheme over pilot and data power based on large-scale fading is proposed to maximize the sum spectral efficiency for a given total energy budget in a coherence interval. Simulation results show that the spectral efficiency of the proposed method is superior to that of other existing methods. It is also shown that, in order to maximize the sum spectral efficiency, more power should be allocated to the data signal power at high signal-to-noise ratios and less power at low signal-to-noise ratios.