TY - JOUR
T1 - Opportunistic Beamforming Using an Intelligent Reflecting Surface Without Instantaneous CSI
AU - Nadeem, Qurrat-Ul-Ain
AU - Chaaban, Anas
AU - Debbah, Merouane
N1 - KAUST Repository Item: Exported on 2021-02-09
Acknowledged KAUST grant number(s): OSR-2018-CRG7-3734.
Acknowledgements: This work was supported by the King Abdullah University of Science andTechnology (KAUST) under Award OSR-2018-CRG7-3734.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2021/1
Y1 - 2021/1
N2 - While intelligent reflecting surface (IRS) assisted wireless communication has emerged as an important research paradigm, channel state information (CSI) acquisition remains a critical challenge to design the IRS phase-shifts and yield the promised coherent beamforming gains. In this letter, we propose an IRS-assisted opportunistic beamforming (OBF) scheme under proportional fair scheduling, which does not require instantaneous CSI to design the IRS parameters. In a slow-fading environment, we show that with only random rotations at the IRS, the proposed scheme can capitalize on the multi-user (MU)-diversity effect to approach the performance of coherent beamforming as the number of users grows large. Next we study the sum-rate scaling of IRS-assisted OBF in the correlated Rayleigh fast fading environment under a deterministic beamforming scheme that results in a considerable sum-rate improvement.
AB - While intelligent reflecting surface (IRS) assisted wireless communication has emerged as an important research paradigm, channel state information (CSI) acquisition remains a critical challenge to design the IRS phase-shifts and yield the promised coherent beamforming gains. In this letter, we propose an IRS-assisted opportunistic beamforming (OBF) scheme under proportional fair scheduling, which does not require instantaneous CSI to design the IRS parameters. In a slow-fading environment, we show that with only random rotations at the IRS, the proposed scheme can capitalize on the multi-user (MU)-diversity effect to approach the performance of coherent beamforming as the number of users grows large. Next we study the sum-rate scaling of IRS-assisted OBF in the correlated Rayleigh fast fading environment under a deterministic beamforming scheme that results in a considerable sum-rate improvement.
UR - http://hdl.handle.net/10754/667265
UR - https://ieeexplore.ieee.org/document/9194749/
UR - http://www.scopus.com/inward/record.url?scp=85099518322&partnerID=8YFLogxK
U2 - 10.1109/lwc.2020.3023399
DO - 10.1109/lwc.2020.3023399
M3 - Article
SN - 2162-2337
VL - 10
SP - 146
EP - 150
JO - IEEE Wireless Communications Letters
JF - IEEE Wireless Communications Letters
IS - 1
ER -