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 <inline-formula> <tex-math notation="LaTeX">M </tex-math></inline-formula> antennas communicates with <inline-formula> <tex-math notation="L...

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Published inIEEE transactions on wireless communications Vol. 19; no. 12; pp. 7748 - 7764
Main Authors Nadeem, Qurrat-Ul-Ain, Kammoun, Abla, Chaaban, Anas, Debbah, Merouane, Alouini, Mohamed-Slim
Format Journal Article
LanguageEnglish
Published New York IEEE 01.12.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Online AccessGet full text
ISSN1536-1276
1558-2248
DOI10.1109/TWC.2020.2986438

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Abstract This work focuses on the downlink of a single-cell multi-user system in which a base station (BS) equipped with <inline-formula> <tex-math notation="LaTeX">M </tex-math></inline-formula> antennas communicates with <inline-formula> <tex-math notation="LaTeX">K </tex-math></inline-formula> 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 <inline-formula> <tex-math notation="LaTeX">N </tex-math></inline-formula> 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 <inline-formula> <tex-math notation="LaTeX">K </tex-math></inline-formula>. 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.
AbstractList This work focuses on the downlink of a single-cell multi-user system in which a base station (BS) equipped with [Formula Omitted] antennas communicates with [Formula Omitted] 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 [Formula Omitted] 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 [Formula Omitted]. 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.
This work focuses on the downlink of a single-cell multi-user system in which a base station (BS) equipped with <inline-formula> <tex-math notation="LaTeX">M </tex-math></inline-formula> antennas communicates with <inline-formula> <tex-math notation="LaTeX">K </tex-math></inline-formula> 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 <inline-formula> <tex-math notation="LaTeX">N </tex-math></inline-formula> 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 <inline-formula> <tex-math notation="LaTeX">K </tex-math></inline-formula>. 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.
Author Alouini, Mohamed-Slim
Nadeem, Qurrat-Ul-Ain
Debbah, Merouane
Kammoun, Abla
Chaaban, Anas
Author_xml – sequence: 1
  givenname: Qurrat-Ul-Ain
  orcidid: 0000-0001-8423-3482
  surname: Nadeem
  fullname: Nadeem, Qurrat-Ul-Ain
  email: qurrat.nadeem@ubc.ca
  organization: School of Engineering, The University of British Columbia, Kelowna, Canada
– sequence: 2
  givenname: Abla
  orcidid: 0000-0002-0195-3159
  surname: Kammoun
  fullname: Kammoun, Abla
  email: abla.kammoun@kaust.edu.sa
  organization: Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
– sequence: 3
  givenname: Anas
  orcidid: 0000-0002-8713-5084
  surname: Chaaban
  fullname: Chaaban, Anas
  email: anas.chaaban@ubc.ca
  organization: School of Engineering, The University of British Columbia, Kelowna, Canada
– sequence: 4
  givenname: Merouane
  surname: Debbah
  fullname: Debbah, Merouane
  email: merouane.debbah@centralesupelec.fr
  organization: CentraleSupélec, Gif-sur-Yvette, France
– sequence: 5
  givenname: Mohamed-Slim
  orcidid: 0000-0003-4827-1793
  surname: Alouini
  fullname: Alouini, Mohamed-Slim
  email: slim.alouini@kaust.edu.sa
  organization: Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
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CODEN ITWCAX
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SubjectTerms 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
Title Asymptotic Max-Min SINR Analysis of Reconfigurable Intelligent Surface Assisted MISO Systems
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