Energy-Efficient Analog Beamforming for RF-WET With Charging Time Constraint

Internet of Things (IoT) sustainability may hinge on radio frequency wireless energy transfer (RF-WET). However, energy-efficient charging strategies are still needed, motivating our work. Specifically, this letter proposes a time division scheme to efficiently charge low-power devices in an IoT net...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2024-08, Vol.73 (8), p.12160-12165
Main Authors: Rosabal, Osmel Martinez, Lopez, Onel L. Alcaraz, Alves, Hirley
Format: Article
Language:English
Subjects:
Analog beamforming
Array signal processing
Energy consumption
energy efficiency
Internet of Things
Lead
low-complexity WET
Optimization
Radio frequency
Rectennas
sustainability
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Summary:Internet of Things (IoT) sustainability may hinge on radio frequency wireless energy transfer (RF-WET). However, energy-efficient charging strategies are still needed, motivating our work. Specifically, this letter proposes a time division scheme to efficiently charge low-power devices in an IoT network. For this, a multi-antenna power beacon (PB) drives the devices' energy harvesting circuit to the highest power conversion efficiency point via energy beamforming, thus achieving minimum energy consumption. Herein, we adopt the analog multi-antenna architecture due to its low complexity, cost, and energy consumption. The proposal includes a simple yet accurate model for the transfer characteristic of the energy harvesting circuit, enabling the optimization framework. The results evince the effectiveness of our RF-WET strategy over a benchmark scheme where the PB charges all the IoT devices simultaneously. Furthermore, the performance increases with the number of PB antennas.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2024.3372703