Results 31 to 40 of about 25,974 (287)
Performance of Large Intelligent Surfaces in Multiuser Millimeter Wave MIMO-NOMA Systems
IEEE Access, 2023 Large Intelligent Surfaces (LIS) are considered a candidate technology for 6G networks due to its simple deployment and relatively low cost. Recently, Millimeter Wave (mmWave) communication has attracted much attention due to its huge spectrum resources (
Nouran Arafat +3 more
doaj +1 more source
Holographic MIMO Communications Exploiting the Orbital Angular Momentum
IEEE Open Journal of the Communications Society, 2023 This study delves into the potential of harnessing the orbital angular momentum (OAM) property of electromagnetic waves in near-field and line-of-sight scenarios by utilizing large intelligent surfaces, in the context of holographic multiple-input ...
Giulia Torcolacci +2 more
doaj +1 more source
Near- and Far-Field Communications with Large Intelligent Surfaces [PDF]
2020 54th Asilomar Conference on Signals, Systems, and Computers, 2020 This paper studies the uplink spectral efficiency (SE) achieved by two single-antenna user equipments (UEs) communicating with a Large Intelligent Surface (LIS), defined as a planar array consisting of $N$ antennas that each has area $A$. The analysis is carried out with a deterministic line-of-sight propagation channel model that captures key ...
Andrea de Jesus Torres +2 more
openaire +3 more sources
Secrecy Analysis and Error Probability of LIS-Aided Communication Systems under Nakagami-m Fading
Entropy, 2021 Large intelligent surfaces (LIS) are a new trend to achieve higher spectral efficiency and signal-to-noise ratio in mobile communications. For this reason, this paper proposes metrics to analyze the performance of systems with multiple antennas aided by ...
Ricardo Coelho Ferreira +4 more
doaj +1 more source
OnRMap: An Online Radio Mapping Approach for Large Intelligent Surfaces [PDF]
2023 IEEE International Conference on Communications Workshops (ICC Workshops), 2023 6 pages, 8 figures, conference ...
Herman Lucas dos Santos +4 more
openaire +2 more sources
Localization and Discrete Beamforming with a Large Reconfigurable Intelligent Surface
CoRR, 2023 In millimeter-wave (mmWave) cellular systems, reconfigurable intelligent surfaces (RISs) are foreseeably deployed with a large number of reflecting elements to achieve high beamforming gains. The large-sized RIS will make radio links fall in the near-field localization regime with spatial non-stationarity issues.
Baojia Luo +6 more
openaire +2 more sources
IEEE Access, 2021 Despite many studies already published on large intelligent surfaces (LIS), there are still some gaps in mathematical models in the face of possible scenarios.
Felipe A. P. de Figueiredo +6 more
doaj +1 more source
Design of Near-Field Beamforming for Large Intelligent Surfaces
IEEE Transactions on Wireless Communications, 2022 In this paper, we propose a novel three-dimensional (3D) near-field beamforming (BF) design for Large Intelligent Surface (LIS). We firstly investigate the definitions of near-field and far-field of LIS, and derive the Fresnel near-field region where amplitudes variations are negligible and only phase variations worsen the harvested array-gains.
Sha Hu 0001 +2 more
openaire +1 more source
Bit Error Probability for Large Intelligent Surfaces Under Double-Nakagami Fading Channels
IEEE Open Journal of the Communications Society, 2020 In this work, we investigate the probability distribution function of the channel fading between a base station, an array of intelligent reflecting elements, known as large intelligent surfaces (LIS), and a single-antenna user. We assume that both fading
Ricardo Coelho Ferreira +4 more
doaj +1 more source
Wireless Localization With Reconfigurable Intelligent Surfaces [PDF]
, 2023 This chapter considers the design of localization algorithms for reconfigurable intelligent surface (RIS)-aided models under different practical channel model settings.
Rinchi, Omar +2 more
core +1 more source