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Reconfigurable Intelligent Surfaces: Three Myths and Two Critical Questions
[article]
2020
arXiv
pre-print
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One option is reconfigurable intelligent surfaces (RIS), which can collect wireless signals from a transmitter and passively beamform them towards the receiver. ...
; 2) How can we estimate channels and control an RIS in real time? ...
RIS have also been called software-controlled metasurfaces [3] and intelligent reflecting surfaces [4] . ...
arXiv:2006.03377v2
fatcat:mscnhobkffczbfpgtnn64yepza
Optimization-driven Machine Learning for Intelligent Reflecting Surfaces Assisted Wireless Networks
[article]
2020
arXiv
pre-print
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Intelligent reflecting surface (IRS) has been recently employed to reshape the wireless channels by controlling individual scattering elements' phase shifts, namely, passive beamforming. ...
These observations motivate us to design a novel optimization-driven ML framework for IRS-assisted wireless networks, which takes both advantages of the efficiency in model-based optimization and the robustness ...
receiver
Intelligent Reflecting Surface (IRS)
IRS controller
Active beamforming
Passive beamforming
x0
y0
z0
x1
y1
Passive
scattering element
Inter-cell communications
IRS controller ...
arXiv:2008.12938v1
fatcat:ysrvjwwgufe4za46ryr3vhpisa
Immersive Mixed Media Augmented Reality Applications and Technology
[chapter]
2009
Lecture Notes in Computer Science
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It operates in non real-time, by employing 360º video recording instead of a live camera feed and it uses immersive projection technology, a 180º dome surface as a display environment. ...
is situated in the iDome environment, but uses a spherical mirror as reflection surface to fill the dome. ...
It utilizes a three meter fiberglass dome as the surface for 180° projection made possible by a High Definition projector and a spherical mirror as reflection surface [1, 2, 3] . ...
doi:10.1007/978-3-642-10467-1_109
fatcat:kqe6m3nhrja5foeg36tjapwdsi
Wireless Communications Through Reconfigurable Intelligent Surfaces
2019
IEEE Access
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INDEX TERMS 6G, large intelligent surfaces, meta-surfaces, reconfigurable intelligent surfaces, smart reflect-arrays, software-defined surfaces, wireless communications, wireless networks. ...
The recent advent of reconfigurable intelligent surfaces in wireless communications enables, on the other hand, network operators to control the scattering, reflection, and refraction characteristics of ...
In particular, different authors have used different terms to denote the RISs, which include: reconfigurable intelligent surfaces, large intelligent surfaces, smart reflect-arrays, intelligent reflecting ...
doi:10.1109/access.2019.2935192
fatcat:6pjbpzbisnduxfykkelv42suhi
Reconfigurable Intelligent Surfaces: Principles and Opportunities
[article]
2021
arXiv
pre-print
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2020 pre-print arXiv:2007.03435v1 fatcat:yydpj3habne3to7oeaaesco5gqOther Versions
Reconfigurable intelligent surfaces (RISs), also known as intelligent reflecting surfaces (IRSs), or large intelligent surfaces (LISs), have received significant attention for their potential to enhance ...
Furthermore, we survey existing research contributions that apply machine learning for tackling challenges in dynamic scenarios, such as random fluctuations of wireless channels and user mobility in RIS-enhanced ...
Reconfigurable intelligent surfaces (RISs), also called intelligent reflecting surfaces (IRSs) [3] , [4] or large intelligent surfaces (LISs) [5] , [6] , comprise an array of reflecting elements for ...
arXiv:2007.03435v3
fatcat:pynhymbavfhgrmqnhzjndxnthq
Wireless Communications Through Reconfigurable Intelligent Surfaces
[article]
2019
arXiv
pre-print
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The recent advent of reconfigurable intelligent surfaces in wireless communications enables, on the other hand, network operators to control the scattering, reflection, and refraction characteristics of ...
intelligent surfaces in 6G and beyond wireless networks. ...
RECONFIGURABLE INTELLIGENT SURFACES: HOW DOTHEY WORK?
Fig. 4 . 4 Reconfigurable reflect-arrays with tunable resonators. ...
arXiv:1906.09490v2
fatcat:g37e2e7lnbgz7lhubkb3xk3wnu
Active Sensing for Communications by Learning
[article]
2022
arXiv
pre-print
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In particular, we consider the adaptive beamforming problem for mmWave beam alignment and the adaptive reconfigurable intelligent surface sensing problem for reflection alignment. ...
To tackle such a challenging problem in which the dimension of historical observations increases over time, we propose to use a long short-term memory (LSTM) network to exploit the temporal correlations ...
coefficients of an intelligent surface can be configured in order to maximize some system objective, e.g., the beamforming gain. ...
arXiv:2112.04075v3
fatcat:wyl4fn7ohvefzm6wjwlbmvaqmm
Deep Learning-Based Optimal RIS Interaction Exploiting Previously Sampled Channel Correlations
[article]
2020
arXiv
pre-print
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Earlier works used estimated channel information with deep learning algorithms to design RIS reflection matrices. ...
One of the main challenges is the configuration of reflecting coefficients without the need for beam training overhead or massive channel estimation. ...
Reconfigurable intelligent surfaces (RISs) [3] , [4] have been proposed as a means of improving the coverage and efficiency of mMIMO systems. ...
arXiv:2010.10087v1
fatcat:fymqekvoyvf6fnwa4ogwymqpea
Smart Radio Environments Empowered by Reconfigurable Intelligent Surfaces: How it Works, State of Research, and Road Ahead
[article]
2020
arXiv
pre-print
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What is a reconfigurable intelligent surface? What is a smart radio environment? What is a metasurface? How do metasurfaces work and how to model them? ...
Shannon's mathematical theory of communication with G. Green's and J. C. ...
However, each unit element may have a complete RF chain and an independent baseband unit. • Intelligent reflecting surfaces (IRSs). ...
arXiv:2004.09352v1
fatcat:ncsxqispbrcdrcpyrqvja3ie3m
Reconfigurable Intelligent Surface aided Massive MIMO Systems with Low-Resolution DACs
[article]
2021
arXiv
pre-print
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We investigate a reconfigurable intelligent surface (RIS)-aided multi-user massive multiple-input multi-output (MIMO) system where low-resolution digital-analog converters (DACs) are configured at the ...
Simulation results show that the downlink sum achievable rate tends to a constant with the increase of the number of quantization bits of DACs, and four quantization bits are enough to capture a large ...
INTRODUCTION Recently, a reconfigurable intelligent surface (RIS), which can configure the wireless propagation environment, has attracted extensive research interests [1] - [3] . ...
arXiv:2103.08871v2
fatcat:bgaechjmibagxkf7uibw7vnaea
Airport Taxi Time Prediction and Alerting: A Convolutional Neural Network Approach
[article]
2021
arXiv
pre-print
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(e.g., runway configuration, the state of aircraft in the taxiing process) is inferred implicitly and automatically by Artificial Intelligence (AI). ...
Learning directly from surface radar information with minimal processing, a computer vision-based model is proposed that incorporates airport surface data in such a way that adaptation-specific information ...
information (e.g., runway configuration, the state of aircraft in the taxiing process) is inferred implicitly and automatically by Artificial Intelligence (AI). ...
arXiv:2111.09139v1
fatcat:hltcceqb7rg2nhpuucps5caqhe
Smart Radio Environments
[article]
2021
arXiv
pre-print
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Meta-surface modelling and design methods are reviewed along with physical realisation techniques. ...
This Roadmap takes the reader on a journey through the research in electromagnetic wave propagation control via reconfigurable intelligent surfaces. ...
Intelligent reflecting surfaces (IRS) can be considered a distinct form of metasurface type apertures. ...
arXiv:2111.08676v1
fatcat:osgcjeksmnfavolkajrr67qo6q
THE IMPACT OF LAND FORM ON URBAN IDENTITY; EL SHAMIYA PROJECT, MAKKAH, SAUDI ARABIA
2016
JES. Journal of Engineering Sciences
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This area is undergoing development that affects its landform configuration. ...
The metric for intelligibility is developed by correlating of global measure spatial configuration with a local measure. ...
The geomorphology has determined the unique urban pattern of the Makkah metropolitan city, which has sprawled in radial direction on the confined surface areas of the complex silt channels. ...
doi:10.21608/jesaun.2016.117604
fatcat:jc3gv3abjveefcv5rrknlpdcye
Performance Analysis of Intelligent Reflecting Surface Assisted Opportunistic Communications
[article]
2022
arXiv
pre-print
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2022 pre-print arXiv:2203.06313v1 fatcat:yw56gc7e2ba5dfqjwn6s77xplq
Intelligent reflecting surfaces (IRSs) are a promising technology for enhancing coverage and spectral efficiency, especially in the millimeter wave (mmWave) bands. ...
Existing approaches to leverage the benefits of IRS involve the use of a resource-intensive channel estimation step followed by a computationally expensive algorithm to optimize the reflection coefficients ...
INTRODUCTION Intelligent Reflecting Surfaces (IRSs) have become a topic of active research for enhancing the performance of next generation wireless communication systems, especially in the millimeter ...
arXiv:2203.06313v2
fatcat:6ehzud2s5nftrem2q2iwybmlta
Intelligent Reflective Surfaces for Wireless Networks: An Overview of Applications, Approached Issues, and Open Problems
2021
Electronics
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An intelligent reflective surface (IRS) is a novel and revolutionizing communication technology destined to enable the control of the radio environment. ...
This technology introduces the notion of a smart propagation environment with the aim of improving the system performance. ...
In particular, two ML algorithms have been proposed, which learn the statistical CSI from the historical channel observations. ...
doi:10.3390/electronics10192345
fatcat:n24ysswfrbe4vlu5kfhc5yopby
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