Distributed Wireless Power Transfer for Multiuser Multi-Antenna Systems Using Hybrid Feedback 


Vol. 45,  No. 9, pp. 1508-1516, Sep.  2020
10.7840/kics.2020.45.9.1508


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  Abstract

In this paper, we propose a new hybrid feedback method composed of one-bit feedback and power-level feedback to remotely charge multiple users using a multi-antenna access point (AP), and also propose an energy beamformer update method for the AP based on the proposed feedback scheme. When wireless charging is conducted in the downlink and information transfer is performed in the uplink, it is possible to estimate the power level of receive signals but difficult to estimate the channel state information (CSI) in the downlink. For this reason, it is hard to implement energy beamforming based on the CSI when the uplink and downlink channels are asymmetric. To solve this problem, the proposed method determines the user priority for energy beamforming using the power-level feedback information. Moreover, the beamforming vector is updated with a variable step-size using the one-bit feedback information in order to increase the receive power of the high-priority user. Through numerical simulations, the proposed energy beamforming method is compared to a random beamforming and the theoretical optimal beamforming in terms of the average power transfer, and the efficacy of the proposed scheme is verified.

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  Cite this article

[IEEE Style]

S. Kim and J. Choi, "Distributed Wireless Power Transfer for Multiuser Multi-Antenna Systems Using Hybrid Feedback," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 9, pp. 1508-1516, 2020. DOI: 10.7840/kics.2020.45.9.1508.

[ACM Style]

Seonyeong Kim and Jihoon Choi. 2020. Distributed Wireless Power Transfer for Multiuser Multi-Antenna Systems Using Hybrid Feedback. The Journal of Korean Institute of Communications and Information Sciences, 45, 9, (2020), 1508-1516. DOI: 10.7840/kics.2020.45.9.1508.

[KICS Style]

Seonyeong Kim and Jihoon Choi, "Distributed Wireless Power Transfer for Multiuser Multi-Antenna Systems Using Hybrid Feedback," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 9, pp. 1508-1516, 9. 2020. (https://doi.org/10.7840/kics.2020.45.9.1508)

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pISSN : 1226 - 4717
eISSN : 2287 - 3880