Joint Optimization in UAV-ground Communications Empowered by Multiple Aerial RISs

Jingyi Li, Jiadai Wang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Being capable of controlling the radio environment well, the contemporary advanced technique, namely reconfigurable intelligent surface (RIS), has been expected to facilitate unmanned aerial vehicle (UAV) communications. The existing studies mainly focus on terrestrial RIS to realize communication performance improvement, which can achieve only half-space reflection and may experience serious signal attenuation brought by several reflections. Motivated by this reason, this paper proposes to install multiple aerial RISs on the balloons to cooperatively boost the received signal power at ground users. Based on this architecture, we jointly optimize UAV trajectory, active beamforming, and passive beamforming, so as to maximize the average system sum rate. Considering that the composite channel gain becomes a complex function of UAV trajectory in the presence of multiple RISs, the block coordinate descent method is developed to address the formulated optimization problem. The mathematical treatment involves three stages, which can be executed by an iterative algorithm. Finally, numerical results verify the competitive superiorities of multiple aerial RISs and the excellence of joint optimization design compared with other benchmark ones.

Original languageEnglish
Title of host publication2022 IEEE 23rd International Conference on High Performance Switching and Routing, HPSR 2022
PublisherIEEE Computer Society
Pages101-106
Number of pages6
ISBN (Electronic)9781665406079
DOIs
StatePublished - 2022
Event23rd IEEE International Conference on High Performance Switching and Routing, HPSR 2022 - Taicang, Jiangsu, China
Duration: 6 Jun 20228 Jun 2022

Publication series

NameIEEE International Conference on High Performance Switching and Routing, HPSR
Volume2022-June
ISSN (Print)2325-5595
ISSN (Electronic)2325-5609

Conference

Conference23rd IEEE International Conference on High Performance Switching and Routing, HPSR 2022
Country/TerritoryChina
CityTaicang, Jiangsu
Period6/06/228/06/22

Keywords

  • Unmanned aerial vehicle (UAV)
  • block coordinate descent
  • joint optimization
  • multiple aerial RISs

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