TY - GEN
T1 - Multivariable Extremum Seeking Controllers for Multi-Beam Steering using Reconfigurable Metasurfaces
AU - Masood, Abdullah Bin
AU - Vassiliou, Vasos
AU - Pitsillides, Andreas
AU - Liaskos, Christos
AU - Lestas, Marios
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - Intelligent Reflecting Metasurfaces constitute a revolutionary technology that can alleviate the blockage problem in mm-Wave communications. In this paper, we consider a metasurface coding that can realize beam splitting of an incident beam in multiple directions and we address the problem of feedback-based adaptive reconfiguration of the metasurface controller states so that the reflected beams are guided towards two intended receivers. As the receiver locations are unknown and to counter system uncertainties, we employ feedback to maximize the received power at both receivers, aiming for standalone operation of the metasurface. Changes in both the elevation and azimuth angles of the transmitted beams are considered, thus necessitating a design beyond standard extremum-seeking controllers, which have proved to be ineffective. Our approach involves online parameter identification techniques for gradient estimation, coupled with the method of steepest ascent. The effectiveness of the method in guiding the beams towards the reference values is shown through simulations.
AB - Intelligent Reflecting Metasurfaces constitute a revolutionary technology that can alleviate the blockage problem in mm-Wave communications. In this paper, we consider a metasurface coding that can realize beam splitting of an incident beam in multiple directions and we address the problem of feedback-based adaptive reconfiguration of the metasurface controller states so that the reflected beams are guided towards two intended receivers. As the receiver locations are unknown and to counter system uncertainties, we employ feedback to maximize the received power at both receivers, aiming for standalone operation of the metasurface. Changes in both the elevation and azimuth angles of the transmitted beams are considered, thus necessitating a design beyond standard extremum-seeking controllers, which have proved to be ineffective. Our approach involves online parameter identification techniques for gradient estimation, coupled with the method of steepest ascent. The effectiveness of the method in guiding the beams towards the reference values is shown through simulations.
UR - http://www.scopus.com/inward/record.url?scp=85146879337&partnerID=8YFLogxK
U2 - 10.1109/GCWkshps56602.2022.10008600
DO - 10.1109/GCWkshps56602.2022.10008600
M3 - Conference contribution
AN - SCOPUS:85146879337
T3 - 2022 IEEE GLOBECOM Workshops, GC Wkshps 2022 - Proceedings
SP - 49
EP - 54
BT - 2022 IEEE GLOBECOM Workshops, GC Wkshps 2022 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE GLOBECOM Workshops, GC Wkshps 2022
Y2 - 4 December 2022 through 8 December 2022
ER -