Asymptotic Max-Min SINR Analysis of Reconfigurable Intelligent Surface Assisted MISO Systems

This work focuses on the downlink of a single-cell multi-user system in which a base station (BS) equipped with M antennas communicates with K single-antenna users through a reconfigurable intelligent surface (RIS) installed in the line-of-sight (LoS) of the BS. RIS is envisioned to offer unprec...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2020-12, Vol.19 (12), p.7748-7764
Main Authors: Nadeem, Qurrat-Ul-Ain, Kammoun, Abla, Chaaban, Anas, Debbah, Merouane, Alouini, Mohamed-Slim
Format: Article
Language:English
Subjects:
Antenna arrays
Antennas
asymptotic analysis
Asymptotic properties
Downlink
Electromagnetic radiation
Interference
Line of sight
MIMO communication
MISO (control systems)
MISO communication
multiple-input single-output (MISO) system
Noise propagation
Optimization
projected gradient ascent
random matrix theory (RMT)
Reconfigurable intelligent surface (RIS)
Reconfigurable intelligent surfaces
Signal to noise ratio
Wave propagation
Wireless communication
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Summary:This work focuses on the downlink of a single-cell multi-user system in which a base station (BS) equipped with M antennas communicates with K single-antenna users through a reconfigurable intelligent surface (RIS) installed in the line-of-sight (LoS) of the BS. RIS is envisioned to offer unprecedented spectral efficiency gains by utilizing N passive reflecting elements that induce phase shifts on the impinging electromagnetic waves to smartly reconfigure the signal propagation environment. We study the minimum signal-to-interference-plus-noise ratio (SINR) achieved by the optimal linear precoder (OLP), that maximizes the minimum SINR subject to a given power constraint for any given RIS phase matrix, for the cases where the LoS channel matrix between the BS and the RIS is of rank-one and of full-rank. In the former scenario, the minimum SINR achieved by the RIS-assisted link is bounded by a quantity that goes to zero with K . For the high-rank scenario, we develop accurate deterministic approximations for the parameters of the asymptotically OLP, which are then utilized to optimize the RIS phase matrix. Simulation results show that RISs can outperform half-duplex relays with a small number of passive reflecting elements while large RISs are needed to outperform full-duplex relays.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2020.2986438