Energy-Efficient SWIPT in Distributed Antenna Systems

In this paper, we propose a scheme to maximize energy efficiency (EE) of simultaneous wireless information and power transfer (SWIPT) in distributed antenna systems (DAS), where power splitting (PS) based receiver is applied at a user who has the minimum harvested power constraint. By deriving some useful properties based on Karush-Kuhn-Tucker (KKT) conditions, we can find the optimal solution very efficiently, which is different from the conventional EE maximization schemes needing numerical iterations. Simulation results verify that our proposed scheme achieves better EE compared to other benchmark schemes.

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