MISO System with Intelligent Reflecting Surface-Assisted Cellular Networks

• Published in: Electronics (Basel) Vol. 12; no. 11; p. 2370
• Main Authors: Kassem, Mona, Al Haj Hassan, Hussein, Nasser, Abbass, Mansour, Ali, Yao, Koffi-Clément
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.06.2023; MDPI
• Subjects: Algorithms; Antennas; Antennas (Electronics); Cellular communication; Communication; Complexity; Computer architecture; Energy consumption; Engineering Sciences; Fading channels; Heuristic methods; Internet of Things; Line of sight; Mathematical optimization; MISO (control systems); Optimization; Performance enhancement; Reconfigurable intelligent surfaces; Signal and Image processing; Transmitters; User satisfaction; France; Intelligent Reflecting Surfaces; resource allocation; MISO; beyond 5G (B5G); cellular networks; SNR
• ISSN: 2079-9292; 2079-9292
• DOI: 10.3390/electronics12112370

This paper proposes an architecture based on Intelligent Reflecting Surfaces (IRSs) to improve the performance of future cellular networks. Specifically, we investigate the use of IRSs in combination with statistical Channel State Information (CSI) to enhance the coverage of Base Stations (BSs) in Multiple-Input Single-Output (MISO) systems. Furthermore, we exploit IRSs to reduce the complexity of the proposed architecture, and therefore the total cost, by reducing the number of required antennas at the transmitters (i.e., BSs). At first, we consider a Rayleigh fading channel between the transmitter and the receiver, and we assume the existence of a Line of Sight (LoS) between the BS and the IRS, as well as between the IRS and the destination. In the second part, we investigate the case of a Single-User Multiple-Input Single-Output (SU-MISO) system, where we study the benefits of IRSs in terms of coverage of the BS; then, we formulate a problem for a Multi-User Multiple-Input Single-Output (MU-MISO) system where the IRS is considered as a block of resources that can assist a certain number of users. The problem of managing the IRS resources is formulated as a nonlinear integer problem. We solve the optimization problem using an exhaustive search and propose two low-complexity heuristic algorithms. The performance of the system is evaluated with respect to a variable number of users, the position of the IRS, the required SNR, and the size of the cell. Simulation results corroborate the proposed approach and show that the introduction of the IRS in the network architecture enhances the overall performance of the network, extends the coverage area, enhances users’ satisfaction, and improves the SNR value, while optimizing the required number of antennas at the BS.