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This letter considers robust precoding for improving the energy efficiency (EE) in a multiple-input multiple-output (MIMO) channel when only imperfect or partial channel state information (CSI) is available at the transmitter. From the perspective of worst case robustness, we aim to maximize the worst case EE subject to additive or multiplicative bounded CSI uncertainties and under total power constraint...
This paper investigates robust energy efficient beam-forming for multi-cell downlink transmissions. A bounded uncertainty region is considered to model the impairments of channel state information (CSI) available at the base station (BS). We formulate the problem of beamforming optimization by maximizing the worst case energy efficiency (EE) under CSI uncertainties. Due to the non-convex nature of...
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