On the beneficial roles of fading and transmit diversity in wireless power transfer with nonlinear energy harvesting

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Title: On the beneficial roles of fading and transmit diversity in wireless power transfer with nonlinear energy harvesting
Author(s): Clerckx, B
Kim, J
Item Type: Journal Article
Abstract: We study the effect of channel fading in Wireless Power Transfer (WPT) and show that fading enhances the RF- to-DC conversion efficiency of nonlinear RF energy harvesters. We then develop a new form of signal design for WPT, denoted as Transmit Diversity, that relies on multiple dumb antennas at the transmitter to induce fast fluctuations of the wireless channel. Those fluctuations boost the RF-to-DC conversion efficiency thanks to the energy harvester nonlinearity. In contrast with (energy) beamforming, Transmit Diversity does not rely on Channel State Information at the Transmitter (CSIT) and does not increase the average power at the energy harvester input, though it still enhances the overall end-to-end power transfer efficiency. Transmit Diversity is also combined with recently developed (energy) waveform and modulation to provide further enhancements. The efficacy of the scheme is analyzed using physics-based and curve fitting-based nonlinear models of the en- ergy harvester and demonstrated using circuit simulations, pro- totyping and experimentation. Measurements with two transmit antennas reveal gains of 50% in harvested DC power over a single transmit antenna setup. The work (again) highlights the crucial role played by the harvester nonlinearity and demonstrates that multiple transmit antennas can be beneficial to WPT even in the absence of CSIT.
Publication Date: 1-Nov-2018
Date of Acceptance: 1-Sep-2018
URI: http://hdl.handle.net/10044/1/64074
DOI: https://dx.doi.org/10.1109/TWC.2018.2870377
ISSN: 1536-1276
Publisher: Institute of Electrical and Electronics Engineers
Start Page: 7731
End Page: 7743
Journal / Book Title: IEEE Transactions on Wireless Communications
Volume: 17
Issue: 11
Copyright Statement: © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Keywords: Science & Technology
Engineering, Electrical & Electronic
transmit diversity
energy modulation
energy waveform
energy beamforming
nonlinear energy harvesting
wireless power transfer
0906 Electrical And Electronic Engineering
1005 Communications Technologies
0805 Distributed Computing
Networking & Telecommunications
Publication Status: Published
Online Publication Date: 2018-09-24
Appears in Collections:Faculty of Engineering
Electrical and Electronic Engineering

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