A Low-Complexity Beamforming Design for Multiuser Wireless Energy Transfer

Wireless energy transfer (WET) is a green enabler of low-power Internet of Things (IoT). Therein, traditional optimization schemes relying on full channel state information (CSI) are often too costly to implement due to excessive energy consumption and high processing complexity. This letter proposes a simple, yet effective, energy beamforming scheme that allows a multi-antenna power beacon (PB) to fairly power a set of IoT devices by only relying on the first-order statistics of the channels. In addition to low complexity, the proposed scheme performs favorably as compared to benchmarking schemes and its performance improves as the number of PB’s antennas increases. Finally, it is shown that further performance improvement can be achieved through proper angular rotations of the PB.

Authors:
López Onel L. A., Monteiro Francisco A., Alves Hirley, Zhang Rui, Latva-aho Matti

Publication type:
A1 Journal article – refereed

Place of publication:

Keywords:
antenna rotation, energy beamforming, first-order statistics, IoT, statistical CSI, WET

Published:
1 September 2020

Full citation:
O. L. A. López, F. A. Monteiro, H. Alves, R. Zhang and M. Latva-Aho, “A Low-Complexity Beamforming Design for Multiuser Wireless Energy Transfer,” in IEEE Wireless Communications Letters, vol. 10, no. 1, pp. 58-62, Jan. 2021, doi: 10.1109/LWC.2020.3020576

DOI:
https://doi.org/10.1109/LWC.2020.3020576

Read the publication here:
http://urn.fi/urn:nbn:fi-fe202103258333