Optimal Energy Beamforming for Distributed Wireless Power Transfer Over Frequency-Selective Channels
Luo B, Yeoh PL, Schober R, Krongold BS (2019)
Publication Language: English
Publication Type: Conference contribution
Publication year: 2019
Event location: Shanghai
ISBN: 978-1-5386-8088-9
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 > 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 − 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.
Authors with CRIS profile
Phee Lep Yeoh
Lehrstuhl für Digitale Übertragung (IDC)
Robert Schober
Lehrstuhl für Digitale Übertragung (IDC)
Involved external institutions
Australia (AU)How to cite
APA:
Luo, B., Yeoh, P.L., Schober, R., & Krongold, B.S. (2019). Optimal Energy Beamforming for Distributed Wireless Power Transfer Over Frequency-Selective Channels. In IEEE (Eds.), Proceedings of the CC 2019 - 2019 IEEE International Conference on Communications (ICC). Shanghai, CN.
MLA:
Luo, Bing, et al. "Optimal Energy Beamforming for Distributed Wireless Power Transfer Over Frequency-Selective Channels." Proceedings of the CC 2019 - 2019 IEEE International Conference on Communications (ICC), Shanghai Ed. IEEE, 2019.
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