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Phase Shifters Versus Switches: An Energy Efficiency Perspective on Hybrid Beamforming

Payami, S; Balasubramanya, NM; Masouros, C; Sellathurai, M; (2018) Phase Shifters Versus Switches: An Energy Efficiency Perspective on Hybrid Beamforming. IEEE Wireless Communications Letters , 8 (1) pp. 13-16. 10.1109/LWC.2018.2846221. Green open access

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Abstract

Hybrid beamforming architectures provide promising solutions to harness the benefits of massive multi-input multi-output systems by incorporating phase shifters, switches, or their combinations. This letter addresses the design of such architectures from an energy efficiency (EE) perspective. We provide closed-form expressions to compare several promising hybrid beamforming architectures, and also derive optimal numbers of antennas required for maximizing the EE. Our results indicate that the asymptotic closed-forms provide a good approximation even for a relatively small number of antennas. Moreover, the combination of phase shifters and switches offers significantly higher EE versus conventional phase shifter-only architectures, while nearly preserving spectral efficiency.

Type: Article
Title: Phase Shifters Versus Switches: An Energy Efficiency Perspective on Hybrid Beamforming
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/LWC.2018.2846221
Publisher version: https://doi.org/10.1109/LWC.2018.2846221
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Phase shifters, Radio frequency, Antennas, Array signal processing, Fading channels, MIMO communication, Power demand
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10058935
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