Reconfigurable Surface Assisted Multi-User Opportunistic Beamforming

Qurrat Ul Ain Nadeem, Anas Chaaban, Merouane Debbah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


Multi-user (MU) diversity yields sum-rate gains by scheduling a user for transmission at times when its channel is near its peak. These gains are limited in environments with line- of-sight (LoS) channel components and/or spatial correlation. To remedy this, previous works have proposed opportunistic beamforming (OBF) using multiple antennas at the BS to transmit the same signal, modulated by time-varying gains, to the best user at each time slot. In this paper, we propose reconfigurable surface (RS)-assisted OBF to increase the range of channel fluctuations in a single-antenna broadcast channel (BC), where opportunistic scheduling (OS) strategy achieves the sum-rate capacity. The RS is abstracted as an array of passive reflecting elements that only induce random phase shifts onto the impinging electromagnetic waves. We develop the sum-rate scaling laws under Rayleigh, Rician and correlated Rayleigh fading and show that RS-assisted OBF with a single-antenna BS can outperform multi-antenna BS- assisted OBF using a moderate number of elements.
Original languageEnglish (US)
Title of host publication2020 IEEE International Symposium on Information Theory (ISIT)
Number of pages6
ISBN (Print)9781728164328
StatePublished - Aug 24 2020
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-06-30
Acknowledged KAUST grant number(s): OSR-2018-CRG7-3734
Acknowledgements: This work is supported by the King Abdullah University of Science and Technology (KAUST) under Award No. OSR-2018-CRG7-3734.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.


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