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• W2956294500 abstract "This paper analyzes the optimal transmission strategy and power allocation for a distributed wireless power transfer (WPT) system operating over frequency-selective fading channels. We consider K coordinated energy transmitters (CETs) coherently transmitting energy to a single user over N &#62; K subchannels with individual power constraints. To maximize the total harvested energy, we derive the optimal co-phasing power allocation rule which has the following properties: 1) For any given subchannel, if the optimal power allocation of one CET is zero, then the power allocated by all the other K &#x2212; 1 CETs to that subchannel is also zero (i.e., the subchannel is inactive); 2) For the non-zero power subchannels, the optimal power allocation obeys a proportionality principle that establishes a relationship between the powers allocated by all K CETs to all active subchannels. Based on this property, we prove that the optimal distributed WPT strategy is for all CETs to select no more than K subchannels. This is in sharp contrast to wireless information transmission where more than K subchannels may be used for capacity maximization. Numerical examples verify our theoretical results and show the performance gains of our proposed scheme compared to two benchmark schemes." @default.
• W2956294500 created "2019-07-23" @default.
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• W2956294500 date "2019-05-01" @default.
• W2956294500 modified "2023-10-15" @default.
• W2956294500 title "Optimal Energy Beamforming for Distributed Wireless Power Transfer Over Frequency-Selective Channels" @default.
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• W2956294500 doi "https://doi.org/10.1109/icc.2019.8761405" @default.
• W2956294500 hasPublicationYear "2019" @default.
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