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Energy-saving UAV-Assisted Multiuser Communications with Massive MIMO Hybrid Beamforming

Research output: Contribution to journalArticle

Jingbo Du, Wei Xu, Yansha Deng, Arumugam Nallanathan, Luc Vandendorpe

Original languageEnglish
JournalIEEE COMMUNICATIONS LETTERS
Published27 Jan 2020

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    FINAL_VERSION.pdf, 478 KB, application/pdf

    Uploaded date:09 Feb 2020

    Version:Accepted author manuscript

    Licence:CC BY

King's Authors

Abstract

In this paper, we consider hybrid beamforming for unmanned aerial vehicle (UAV)-assisted communications with massive multiple-input multiple-output (MIMO). Using a hybrid beamforming design, we derive an approximate closed-form
expression of rate and provide a power allocation design under the line-of-sight (LoS) channels. It is revealed that the total transmit power should be inversely proportional to the number of antennas of UAV in order to satisfy the rate requirement of each user. Furthermore, we propose the optimal location design
of the UAV. For the special case the pathloss exponent is 2, the optimal location is the weighted average location of all users where the weights are signal to interference plus noise ratio (SINR) requirements of all users. It is shown that the weighted average location could be an approximate method to design the UAV location with little performance gap to the optimal location even when path loss exponent is not 2.

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