Energy-efficient power control for MIMO time-varying channels

Fast rising data traffic in mobile communication entails an increase in its energy consumption, which may result in climate effects and high operation costs, unless measures are taken to enhance its energy efficiency (EE). As part of the endeavour towards higher EE, we present a power control policy that adapts to a time-varying channel for multiple antenna communication. We provide a power budget model that reflects the power expenditure of a base station, that even accounts for the power used for training which enables channel information at the transmitter. We apply the results to Rayleigh fading channels and compare them with a suboptimal power policy where a constant power allocation is applied at all times. The relationship between the EE and the antenna configuration is discussed.