Results 21 to 30 of about 1,981,914 (281)

On Half-Power Beamwidth of Intelligent Reflecting Surface [PDF]

IEEE Communications Letters, 2021
Half-power beamwidth (HPBW) is a key parameter to measure the performance of antenna array and the newly proposed intelligent reflecting surface (IRS) systems. In this paper, we first establish a system model for IRS in uniform linear array (ULA) and uniform rectangular array (URA) configurations, then the IRS HPBW in both cases are derived under the ...
Han Han, Yihong Liu 0003, Lei Zhang 0035
openaire   +1 more source

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   +3 more sources

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

Integration of NOMA with Reflecting Intelligent Surfaces: A Multi-cell Optimization with SIC Decoding Errors [PDF]

, 2023
Reflecting intelligent surfaces (RIS) has gained significant attention due to its high energy and spectral efficiency in next-generation wireless networks.
Khan, Wali Ullah, Symeon Chatzinotas, Wali Ullah Khan, Asif, Muhammad, Mahmood, Asad, Lagunas, Eva, Ali, Zain, Ottersten, Björn, Muhammad Asif, CHATZINOTAS, Symeon, Chatzinotas, Muhammad Asif Symeon, Zain Ali, Björn Ottersten, Eva Lagunas, Asad Mahmood   +14 more
core   +1 more source

Downlink Throughput of Cell-Free Massive MIMO Systems Assisted by Hybrid Relay-Reflecting Intelligent Surfaces [PDF]

, 2022
We consider in this work a cell-free (CF) massive multiple-input-multiple-output (mMIMO) system where multiple hybrid relay-reflecting intelligent surfaces (HR-RIS) are deployed to assist communication between access points and users.
Nguyen, Nhan T., Chatzinotas, Symeon, Nguyen, V.-Dinh, Juntti, Markku, Ngo, Hien Q., Nguyen, Hieu V.   +5 more
core   +3 more sources

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   +4 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

Time vs. Unit Cell Splitting for Autonomous Reconfigurable Intelligent Surfaces [PDF]

, 2022
In this work, we propose a time- and a unit cell-splitting protocol for supplying the energy needs of reconfigurable intelligent surfaces (RISs) through wireless energy harvesting (EH) from information signals. We first compute the RIS energy consumption
Abadal Cavallé, Sergi, Boulogeorgos, Alexandros-Apostolos A., Mesodiakaki, Agapi, Abadal, Sergi, NTONTIN, Konstantinos, CHATZINOTAS, Symeon, Chatzinotas, Simeon, ABDULLAH, Zaid, Boulogeorgos, Alexandros Apostolos A.   +8 more
core   +1 more source