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The joint design of spatial channel assignment and power allocation inMultiple Input Multiple Output (MIMO) systems capable of Simultaneous WirelessInformation and Power Transfer (SWIPT) is studied. Assuming availability ofchannel state information at both communications ends, we maximize theharvested energy at the multi-antenna receiver, while satisfying a minimuminformation rate requirement for the MIMO link. We first derive the globallyoptimal eigenchannel assignment and power allocation design, and then present apractically motivated tight closed-form approximation for the optimal designparameters. Selected numerical results verify the validity of the optimalsolution and provide useful insights on the proposed designs as well as thepareto-optimal rate-energy tradeoff.

Jointly Optimal Spatial Channel Assignment and Power Allocation for MIMO SWIPT Systems