A Novel SCA-Based Method for Beamforming Optimization in IRS/RIS-Assisted MU-MISO Downlink

In this letter, we consider the fundamental problem of jointly designing the transmit beamformers and the phase-shifts of the intelligent reflecting surface (IRS) / reconfigurable intelligent surface (RIS) to minimize the transmit power, subject to quality-of-service constraints at individual users...

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Published in:	IEEE wireless communications letters Vol. 12; no. 2; p. 1
Main Authors:	Kumar, Vaibhav, Zhang, Rui, Renzo, Marco Di, Tran, Le-Nam
Format:	Journal Article
Language:	English
Published:	Piscataway IEEE 01.02.2023 The Institute of Electrical and Electronics Engineers, Inc. (IEEE) IEEE comsoc
Subjects:	Beamforming Benchmark testing Benchmarks Communications systems Complexity theory Downlink Downlinking Engineering Sciences Intelligent reflecting surface Interference Iterative methods MISO (control systems) MU-MISO Optimization Quality of service reconfigurable intelligent surfaces second-order cone programming Signal and Image processing Signal to noise ratio successive convex approximation second-order cone programming reconfigurable intelligent surfaces Intelligent reflecting surface MU-MISO successive convex approximation
ISSN:	2162-2337, 2162-2345
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Abstract	In this letter, we consider the fundamental problem of jointly designing the transmit beamformers and the phase-shifts of the intelligent reflecting surface (IRS) / reconfigurable intelligent surface (RIS) to minimize the transmit power, subject to quality-of-service constraints at individual users in an IRS-assisted multiuser multiple-input single-output downlink communication system. In particular, we propose a new successive convex approximation based second-order cone programming approach in which all the optimization variables are simultaneously updated in each iteration. Our proposed scheme achieves superior performance compared to state-of-the-art benchmark solutions. In addition, the complexity of the proposed scheme is O(Ns3.5), while that of state-of-the-art benchmark schemes is O(Ns7), where Ns denotes the number of reflecting elements at the IRS.
AbstractList	In this letter, we consider the fundamental problem of jointly designing the transmit beamformers and the phase-shifts of the intelligent reflecting surface (IRS) / reconfigurable intelligent surface (RIS) to minimize the transmit power, subject to quality-of-service constraints at individual users in an IRS-assisted multiuser multiple-input single-output downlink communication system. In particular, we propose a new successive convex approximation based second-order cone programming approach in which all the optimization variables are simultaneously updated in each iteration. Our proposed scheme achieves superior performance compared to state-of-the-art benchmark solutions. In addition, the complexity of the proposed scheme is O(Ns3.5), while that of state-of-the-art benchmark schemes is O(Ns7), where Ns denotes the number of reflecting elements at the IRS. In this letter, we consider the fundamental problem of jointly designing the transmit beamformers and the phaseshifts of the intelligent reflecting surface (IRS)/reconfigurable intelligent surface (RIS) to minimize the transmit power, subject to quality-of-service constraints at individual users in an IRS-assisted multiuser multiple-input single-output downlink communication system. In particular, we propose a new successive convex approximation based second-order cone programming approach in which all the optimization variables are simultaneously updated in each iteration. Our proposed scheme achieves superior performance compared to state-of-the-art benchmark solutions. In addition, the complexity of the proposed scheme is O(N 3.5 s), while that of state-of-the-art benchmark schemes is O(N 7 s), where N s denotes the number of reflecting elements at the IRS. In this letter, we consider the fundamental problem of jointly designing the transmit beamformers and the phase-shifts of the intelligent reflecting surface (IRS)/reconfigurable intelligent surface (RIS) to minimize the transmit power, subject to quality-of-service constraints at individual users in an IRS-assisted multiuser multiple-input single-output downlink communication system. In particular, we propose a new successive convex approximation based second-order cone programming approach in which all the optimization variables are simultaneously updated in each iteration. Our proposed scheme achieves superior performance compared to state-of-the-art benchmark solutions. In addition, the complexity of the proposed scheme is [Formula Omitted], while that of state-of-the-art benchmark schemes is [Formula Omitted], where [Formula Omitted] denotes the number of reflecting elements at the IRS.
Author	Tran, Le-Nam Zhang, Rui Renzo, Marco Di Kumar, Vaibhav
Author_xml	– sequence: 1 givenname: Vaibhav orcidid: 0000-0002-2374-1317 surname: Kumar fullname: Kumar, Vaibhav organization: School of Electrical and Electronic Engineering, University College Dublin, Dublin, Ireland – sequence: 2 givenname: Rui orcidid: 0000-0002-8729-8393 surname: Zhang fullname: Zhang, Rui organization: The Chinese University of Hong Kong, Shenzhen, and Shenzhen Research Institute of Big Data, Shenzhen, China – sequence: 3 givenname: Marco Di orcidid: 0000-0003-0772-8793 surname: Renzo fullname: Renzo, Marco Di organization: CNRS, CentraleSupélec, Laboratoire des Signaux et Systèmes, 3 Rue Joliot-Curie, Université Paris-Saclay, Gif-sur-Yvette, France – sequence: 4 givenname: Le-Nam orcidid: 0000-0002-9317-9980 surname: Tran fullname: Tran, Le-Nam organization: School of Electrical and Electronic Engineering, University College Dublin, Dublin, Ireland
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Snippet	In this letter, we consider the fundamental problem of jointly designing the transmit beamformers and the phase-shifts of the intelligent reflecting surface... In this letter, we consider the fundamental problem of jointly designing the transmit beamformers and the phaseshifts of the intelligent reflecting surface...
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SubjectTerms	Beamforming Benchmark testing Benchmarks Communications systems Complexity theory Downlink Downlinking Engineering Sciences Intelligent reflecting surface Interference Iterative methods MISO (control systems) MU-MISO Optimization Quality of service reconfigurable intelligent surfaces second-order cone programming Signal and Image processing Signal to noise ratio successive convex approximation
Title	A Novel SCA-Based Method for Beamforming Optimization in IRS/RIS-Assisted MU-MISO Downlink
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