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In this paper, the authors study a multiuser Multiple-Input Single-Output (MISO) broadcast system for Simultaneous Wireless Information and Power Transfer (SWIPT), where a multi-antenna Access Point (AP) sends information and energy simultaneously via beam-forming to multiple single-antenna receivers. They maximize the weighted sum-power transferred to Energy Harvesting (EH) receivers subject to a set of minimum Signal-to-Interference-and-Noise Ratio (SINR) constraints at Information Decoding (ID) receivers. In particular, they consider two types of ID receivers, namely Type I and Type II receivers, without and with the capability of cancelling the interference from energy signals, respectively.
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