A Wireless Power Transfer System with Beamforming Based on Beam-Steered Pilots

Kang, Gil-Mo; Shin, Oh‐Soon

doi:10.5573/ieie.2020.57.8.28

Cited by 1 publication

(4 citation statements)

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“…The receiver is assumed to be equipped with a single antenna. In the following subsections, we present the signal model for WPT and provide a brief review of the beam scanning scheme proposed in [22].…”

Section: System Modelmentioning

confidence: 99%

“…Recently, a simple but effective beam scanning method was proposed to realize beamforming in a WPT system [22]. The beam space was partitioned into several subspaces, and the transmitter transmitted a pilot signal steered in the AoD corresponding to each subspace.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, the receiver provides the optimal AoD information to the transmitter via a dedicated feedback channel. The accuracy of the beam-scanning scheme is determined by the resolution of the pilot signals in the space and time domains, as the pilot signals are intermittently transmitted for a finite number of quantized beam subspaces [22]. A direct solution for improving the accuracy in the space domain is to increase the number of beam subspaces.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the proposed technique is expected to improve the accuracy of beamforming in both space and time domains. Numerical results are presented to demonstrate the The remainder of this paper is organized as follows: Section II describes the signal model for a WPT system and briefly reviews the beam scanning method proposed in [22]. In Section III, the spatio-temporal interpolation technique proposed herein for improving the accuracy of beam scanning in space and time domains is described.…”

Section: Introductionmentioning

confidence: 99%

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Fine Beam Tracking Using Spatio–Temporal Interpolation in Wireless Power Transfer Systems

et al. 2023

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The use of transmit beamforming in a radio-frequency wireless power transfer (WPT) system can improve the energy transmission efficiency by concentrating the transmit power in the angle of departure (AoD). Optimal beamforming requires information regarding the AoD or the channel between the transmitter and receiver. A previously proposed WPT system continually estimates the optimal AoD using custom-designed pilot signals, which are known as beam-steered pilot signals and are transmitted periodically at every frame. Herein, we propose a spatio-temporal interpolation technique to improve the accuracy of beam tracking for such a WPT system. Specifically, thin-plate spline interpolation is adopted in the space domain to overcome the limited angular resolution of the beam-steered pilot signals in a threedimensional channel. In the time domain, polynomial interpolation is performed to track the changing AoD during consecutive frames. Numerical results show that the proposed technique can improve the WPT efficiency as well as the mean square error performance of the beamforming weight vector.INDEX TERMS Beamforming, pilot signals, spatio-temporal interpolation, wireless power transfer (WPT).

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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