TY - JOUR
T1 - Sum-Rate Maximization for Intelligent Reflecting Surface Assisted Terahertz Communications
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 - http://www.scopus.com/inward/record.url?scp=85122866535&partnerID=8YFLogxK
U2 - 10.1109/TVT.2022.3140869
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 -