Sum-Rate Maximization for Intelligent Reflecting Surface Assisted Terahertz Communications

Yijin Pan; Kezhi Wang; Cunhua Pan; Huiling Zhu; Jiangzhou Wang

doi:10.1109/TVT.2022.3140869

Sum-Rate Maximization for Intelligent Reflecting Surface Assisted Terahertz Communications

Yijin Pan, Kezhi Wang^*, Cunhua Pan^*, Huiling Zhu, Jiangzhou Wang

^*Corresponding author for this work

School of Computer Science

Research output: Contribution to journal › Article › peer-review

77 Citations (Scopus)

26 Downloads (Pure)

Abstract

In this paper, an intelligent reflecting surface (IRS) is deployed to assist the terahertz (THz) communications. The sum-rate of user equipments (UEs) is maximized while guaranteeing the rate requirement of each UE. A block coordinate searching (BCS) algorithm is proposed to jointly optimize the IRS's coordinates, phase shifts, THz sub-bands allocation and power control. Specifically, the relaxation with penalties based (RPB) algorithm is developed to guarantee the feasibility of obtained IRS's coordinates and the monotonicity of objective value. In addition, to optimize the IRS's phase shifts, the sub-gradient descent (SGD) algorithm is proposed, where the IRS phase shifts are formulated as closed-form expressions with introduced pricing factors. Simulation results show that the proposed scheme can significantly enhance system performance.

Original language	English
Pages (from-to)	3320-3325
Number of pages	6
Journal	IEEE Transactions on Vehicular Technology
Volume	71
Issue number	3
Early online date	6 Jan 2022
DOIs	https://doi.org/10.1109/TVT.2022.3140869
Publication status	Published - 15 Mar 2022

Keywords

Absorption
Bandwidth
Intelligent reflecting surface (IRS)
Propagation losses
Reconfigurable intelligent surface (RIS)
Reflection
Resource management
Scattering
Terahertz (THz) communication
Wireless communication

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title = "Sum-Rate Maximization for Intelligent Reflecting Surface Assisted Terahertz Communications",

abstract = "In this paper, an intelligent reflecting surface (IRS) is deployed to assist the terahertz (THz) communications. The sum-rate of user equipments (UEs) is maximized while guaranteeing the rate requirement of each UE. A block coordinate searching (BCS) algorithm is proposed to jointly optimize the IRS's coordinates, phase shifts, THz sub-bands allocation and power control. Specifically, the relaxation with penalties based (RPB) algorithm is developed to guarantee the feasibility of obtained IRS's coordinates and the monotonicity of objective value. In addition, to optimize the IRS's phase shifts, the sub-gradient descent (SGD) algorithm is proposed, where the IRS phase shifts are formulated as closed-form expressions with introduced pricing factors. Simulation results show that the proposed scheme can significantly enhance system performance. ",

keywords = "Absorption, Bandwidth, Intelligent reflecting surface (IRS), Propagation losses, Reconfigurable intelligent surface (RIS), Reflection, Resource management, Scattering, Terahertz (THz) communication, Wireless communication",

author = "Yijin Pan and Kezhi Wang and Cunhua Pan and Huiling Zhu and Jiangzhou Wang",

note = "Funding information: This work was supported in part by the National Natural Science Foundation of China under Grants 62001107, No. 61971129, No. 61960206005, No. 61871128, Basic Research Project of Jiangsu Provincial Department of Science and Technology under Grant No. BK20190339, No. Bk20192002.",

year = "2022",

month = mar,

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doi = "10.1109/TVT.2022.3140869",

language = "English",

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AU - Pan, Yijin

AU - Wang, Kezhi

AU - Pan, Cunhua

AU - Zhu, Huiling

AU - Wang, Jiangzhou

N1 - Funding information: This work was supported in part by the National Natural Science Foundation of China under Grants 62001107, No. 61971129, No. 61960206005, No. 61871128, Basic Research Project of Jiangsu Provincial Department of Science and Technology under Grant No. BK20190339, No. Bk20192002.

PY - 2022/3/15

Y1 - 2022/3/15

N2 - In this paper, an intelligent reflecting surface (IRS) is deployed to assist the terahertz (THz) communications. The sum-rate of user equipments (UEs) is maximized while guaranteeing the rate requirement of each UE. A block coordinate searching (BCS) algorithm is proposed to jointly optimize the IRS's coordinates, phase shifts, THz sub-bands allocation and power control. Specifically, the relaxation with penalties based (RPB) algorithm is developed to guarantee the feasibility of obtained IRS's coordinates and the monotonicity of objective value. In addition, to optimize the IRS's phase shifts, the sub-gradient descent (SGD) algorithm is proposed, where the IRS phase shifts are formulated as closed-form expressions with introduced pricing factors. Simulation results show that the proposed scheme can significantly enhance system performance.

AB - In this paper, an intelligent reflecting surface (IRS) is deployed to assist the terahertz (THz) communications. The sum-rate of user equipments (UEs) is maximized while guaranteeing the rate requirement of each UE. A block coordinate searching (BCS) algorithm is proposed to jointly optimize the IRS's coordinates, phase shifts, THz sub-bands allocation and power control. Specifically, the relaxation with penalties based (RPB) algorithm is developed to guarantee the feasibility of obtained IRS's coordinates and the monotonicity of objective value. In addition, to optimize the IRS's phase shifts, the sub-gradient descent (SGD) algorithm is proposed, where the IRS phase shifts are formulated as closed-form expressions with introduced pricing factors. Simulation results show that the proposed scheme can significantly enhance system performance.

KW - Absorption

KW - Bandwidth

KW - Intelligent reflecting surface (IRS)

KW - Propagation losses

KW - Reconfigurable intelligent surface (RIS)

KW - Reflection

KW - Resource management

KW - Scattering

KW - Terahertz (THz) communication

KW - Wireless communication

UR - https://www.scopus.com/pages/publications/85122866535

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DO - 10.1109/TVT.2022.3140869

M3 - Article

SN - 0018-9545

VL - 71

SP - 3320

EP - 3325

JO - IEEE Transactions on Vehicular Technology

JF - IEEE Transactions on Vehicular Technology

IS - 3

ER -

Sum-Rate Maximization for Intelligent Reflecting Surface Assisted Terahertz Communications

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