Energy-Saving Precoder Design for Narrowband and Wideband Massive MIMO

In this work, we study massive multiple-input multiple-output (MIMO) precoders optimizing power consumption while achieving the users’ rate requirements. We first characterize analytically solutions for narrowband and wideband systems minimizing amplifiers (PAs) in low system load, where per-antenna constraints are not binding. After, focus on asymptotic regime. The consumed by whole base station (BS) high-load scenario then also investigated. obtain simple solutions, optimal strategy case reduces to finding number of active antennas, relying known among antennas. Numerical results show that large savings achievable employing antenna selection, all antennas need be activated when considering only PAs consumption, implies lower savings. When overall BS a subcarriers, significant low-load regime using subset While optimization based transmit pushes activate activates proportional load.