Results 21 to 30 of about 7,039 (276)

On the Position of Intelligent Reflecting Surfaces

2021 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit), 2021
We study the positional impact of an intelligent reflecting surface (IRS) on the achievable rate for single and multiple antenna systems. We show that in IRS-aided single antenna systems, it is always best to place the IRS as close as possible to the transmitter or receiver since the large-scale fading for IRS-reflected links is the main factor that ...
Emad Ibrahim, Rickard Nilsson, Jaap van de Beek   +2 more
openaire   +2 more sources

Multi-Functional Reconfigurable Intelligent Surfaces for Enhanced Sensing and Communication

Sensors, 2023
In this paper, we propose a reconfigurable intelligent surface (RIS) that can dynamically switch the transmission and reflection phase of incident electromagnetic waves in real time to realize the dual-beam or quad-beam and convert the polarization of ...
Khushboo Singh, Mondeep Saikia, Karthick Thiyagarajan, Dushmantha Thalakotuna, Karu Esselle, Sarath Kodagoda   +5 more
doaj   +1 more source

Simultaneously Transmitting and Reflecting Intelligent Omni-Surfaces: Modeling and Implementation [PDF]

, 2022
Given the rapid development of advanced electromagnetic (EM) manipulation technologies, researchers have turned their attention to the investigation of smart surfaces for enhancing radio coverage.
Liu, Y, Liu, Yuanwei, Xu, Jiaqi, Poor, H. Vincent, Mu, Xidong, Hanzo, Lajos, Mu, X, Song, L, Poor, HV, Zhou, JT, Xu, J, Tianyi Zhou, Joey, Zhou, Joey Tianyi, Hanzo, L, Song, Lingyang   +14 more
core   +1 more source

Revolutionizing Optical Wireless Communications via Smart Optics

IEEE Open Journal of the Communications Society, 2022
The heterogeneity of optical wireless networks (OWNs) has expanded over decades in terms of services, node densities, mobility requirements, bandwidth needs, responsiveness, and physical device profile.
Amr M. Abdelhady, Osama Amin, Mohamed-Slim Alouini, Basem Shihada   +3 more
doaj   +1 more source

Semi-Blind Channel Estimation for Intelligent Reflecting Surfaces in Massive MIMO Systems

IEEE Access, 2022
Intelligent reflecting surface (IRS) is considered as a promising technology for enhancing the transmission rate in cellular networks. Such improvement is attributed to considering a large IRS with high number of passive reflecting elements, optimized to
Ahmed S. Alwakeel, Ahmed Elzanaty
doaj   +1 more source

Intelligent Reflecting Surface Aided Vehicular Communications [PDF]

2020 IEEE Globecom Workshops (GC Wkshps, 2020
We investigate the use of an intelligent reflecting surface (IRS) in a millimeter-wave (mmWave) vehicular communication network. An intelligent reflecting surface consists of passive elements, which can reflect the incoming signals with adjustable phase shifts. By properly tuning the phase shifts we can improve link performance.
Dilin Dampahalage, K. B. Shashika Manosha, Nandana Rajatheva, Matti Latva-aho   +3 more
openaire   +3 more sources

Massive MIMO Communication With Intelligent Reflecting Surface

IEEE Transactions on Wireless Communications, 2023
This paper studies the feasibility of deploying intelligent reflecting surfaces (IRSs) in massive MIMO (multiple-input multiple-output) systems to improve the performance of users in the service dead zone. To reduce the channel training overhead, we advocate a novel protocol for the uplink communication in the IRS-assisted massive MIMO systems.
Zhaorui Wang 0001, Liang Liu 0003, Shuowen Zhang, Shuguang Cui   +3 more
openaire   +2 more sources

On IRS-Assisted Covert Communication with a Friendly UAV

Drones, 2023
Driven by the rapidly growing demand for information security, covert wireless communication has become an essential technology and attracted tremendous attention.
Xiaobei Xu, Linzi Hu, Sha Wei, Yuwen Qian, Shihao Yan, Feng Shu, Jun Li   +6 more
doaj   +1 more source

Federated Learning via Intelligent Reflecting Surface [PDF]

IEEE Transactions on Wireless Communications, 2022
Over-the-air computation (AirComp) based federated learning (FL) is capable of achieving fast model aggregation by exploiting the waveform superposition property of multiple access channels. However, the model aggregation performance is severely limited by the unfavorable wireless propagation channels.
Zhibin Wang 0003, Jiahang Qiu, Yong Zhou 0006, Yuanming Shi, Liqun Fu 0001, Wei Chen 0002, Khaled B. Letaief   +6 more
openaire   +3 more sources

Covert Transmission Assisted by Intelligent Reflecting Surface [PDF]

IEEE Transactions on Communications, 2021
Covert transmission is studied for an intelligent reflecting surface (IRS) aided communication system, where Alice aims to transmit messages to Bob without being detected by the warden Willie. Specifically, an IRS is used to increase the data rate at Bob under a covert constraint.
Jiangbo Si, Zan Li 0001, Yan Zhao, Julian Cheng, Lei Guan, Jia Shi 0001, Naofal Al-Dhahir   +6 more
openaire   +2 more sources