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Analysis and Optimization of an Intelligent Reflecting Surface-assisted System with Interference
[article]
2020
arXiv
pre-print
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In this paper, we study an intelligent reflecting surface (IRS)-assisted system where a multi-antenna base station (BS) serves a single-antenna user with the help of a multi-element IRS in the presence ...
We investigate two cases of CSI at the BSs, namely, the instantaneous CSI case and the statistical CSI case, and apply Maximum Ratio Transmission (MRT) based on the complete CSI and the CSI of the Line-of-sight ...
Index Terms-Intelligent reflecting surface, multi-antenna, interference, average rate, ergodic rate, phase shift optimization.
I. ...
arXiv:2002.00168v3
fatcat:ld33bay3kff33pftrgempidxzi
Intelligent Reflecting Surfaces and Next Generation Wireless Systems
[article]
2024
arXiv
pre-print
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, where the IRS is configured relatively infrequently based on statistical CSI (S-CSI) and the active beamformers and power allocation are updated based on quickly outdated instantaneous CSI (I-CSI) per ...
Intelligent reflecting surface (IRS) is a potential candidate for massive multiple-input multiple-output (MIMO) 2.0 technology due to its low cost, ease of deployment, energy efficiency and extended coverage ...
To reduce the channel training overhead, a two-timescale transmission protocol is proposed in [30] , where the sum-rate can be maximized by optimizing IRS and precoder with statistical CSI (S-CSI) and ...
arXiv:2402.16453v2
fatcat:jqqsoyj3c5g4ncvcizeyf3tjqu
Intelligent Reflecting Surface Enhanced Wireless Network: Two-timescale Beamforming Optimization
[article]
2020
arXiv
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Specifically, the passive IRS phase-shifts are first optimized based on the statistical CSI (S-CSI) of all links, which varies much slowly as compared to their I-CSI, while the transmit beamforming/precoding ...
Intelligent reflecting surface (IRS) has drawn a lot of attention recently as a promising new solution to achieve high spectral and energy efficiency for future wireless networks. ...
Recently, intelligent reflecting surface (IRS) (also known as reconfigurable intelligent surface (RIS) and so on) has been proposed as a new solution to achieve high spectral efficiency with low energy ...
arXiv:1912.01818v2
fatcat:m3zfsnt33rearbnlfcfse5fzbq
Intelligent Reflecting Surface-Assisted Cognitive Radio System
[article]
2019
arXiv
pre-print
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Meanwhile, intelligent reflecting surface (IRS), also known as reconfigurable intelligent surface (RIS), has been recently proposed as a promising approach to enhance energy efficiency (EE) of wireless ...
optimizing the beamforming at SU-TX and the reflecting coefficients at each IRS. ...
Index Terms-Intelligent reflecting surface (IRS), reconfigurable intelligent surface (RIS), cognitive radio, robust beamforming.
I. ...
arXiv:1912.10678v1
fatcat:tnnpditrkva2dgxyp62zlkmsdq
Learning to Reflect and to Beamform for Intelligent Reflecting Surface with Implicit Channel Estimation
[article]
2021
arXiv
pre-print
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2020 pre-print arXiv:2009.14404v2 fatcat:xdxv5nguibcnvb376jmnxiex2mOther Versions
Intelligent reflecting surface (IRS), which consists of a large number of tunable reflective elements, is capable of enhancing the wireless propagation environment in a cellular network by intelligently ...
the beamformers at the BS and the reflective coefficients at the IRS based on a system objective. ...
This paper investigates the design of reflective patterns for intelligent reflecting surfaces (IRS) composed of a large number of tunable reflective elements. ...
arXiv:2009.14404v4
fatcat:icl5rmox25dmtfcb7cpmvip3qu
Secure Cognitive Radio Communication via Intelligent Reflecting Surface
[article]
2021
arXiv
pre-print
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In this paper, an intelligent reflecting surface (IRS) assisted spectrum sharing underlay cognitive radio (CR) wiretap channel (WTC) is studied, and we aim at enhancing the secrecy rate of secondary user ...
Therefore, we propose new numerical solutions to optimize the secrecy rate of this channel under full primary, secondary users' channel state information (CSI) and three different cases of Eve's CSI: full ...
The authors are with the School of Information and Communications Engineering, and also with the Ministry of Education Key Lab for Intelligent Networks and Network Security, Xi'an Jiaotong University, ...
arXiv:2104.05012v1
fatcat:q2fgvndvrrbuhel4iqnyrfbhjy
Robust and Secure Wireless Communications via Intelligent Reflecting Surfaces
[article]
2020
arXiv
pre-print
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In this paper, intelligent reflecting surfaces (IRSs) are employed to enhance the physical layer security in a challenging radio environment. ...
To address the non-convexity of the optimization problem, an efficient algorithm is developed by capitalizing on alternating optimization, a penalty-based approach, successive convex approximation, and ...
Among various types of metasurfaces, intelligent reflecting surfaces (IRSs), a kind of passive metasurface, are particularly appealing and have been recently exploited for wireless communication system ...
arXiv:1912.01497v3
fatcat:4o2d2muq7vgsjbfh5ba24krada
Location Information Aided Multiple Intelligent Reflecting Surface Systems
[article]
2020
arXiv
pre-print
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This paper proposes a novel location information aided multiple intelligent reflecting surface (IRS) systems. ...
The analytical findings indicate that the achievable rate can be improved by increasing the number of base station (BS) antennas or reflecting elements. ...
Fig. 5 : 5 The impact of the number of reflecting elements on the sum rate. ...
arXiv:2008.09248v1
fatcat:qubb4ztthjftjj47zsw2tqscmm
Robust Joint Design for Intelligent Reflecting Surfaces Assisted Cell-Free Networks
[article]
2022
arXiv
pre-print
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Intelligent reflecting surfaces (IRSs) have emerged as a promising economical solution to implement cell-free networks. ...
However, the performance gains achieved by IRSs critically depend on smartly tuned passive beamforming based on the assumption that the accurate channel state information (CSI) knowledge is available, ...
uncertainties by maximizing the expectation of the sum-rate that depend on the CSI error. ...
arXiv:2201.09685v2
fatcat:o4payr4cerch3domkuulpt6fme
Intelligent Reflecting Surface Aided Wireless Energy and Information Transmission: An Overview
[article]
2021
arXiv
pre-print
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Intelligent reflecting surface (IRS) is a promising technology for achieving spectrum and energy efficient wireless networks cost-effectively. ...
In particular, we present state-of-the-art solutions to tackle the unique challenges in operating these systems, such as IRS passive reflection optimization, channel estimation and deployment. ...
certain performance loss as compared to their joint optimization based on AO with the perfect CSI. ...
arXiv:2106.07997v3
fatcat:nwipup4lc5frvbv4keopecqjrq
Intelligent Reflecting Surfaces Beamforming Optimization with Statistical Channel Knowledge
2022
Sensors
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Intelligent Reflecting Surfaces (IRSs) are emerging as an effective technology capable of improving the spectral and energy efficiency of future wireless networks. ...
To overcome this problem, a new approach is proposed in order to optimize beamforming at the BS and the phase shifts at the IRS without considering any knowledge of I-CSI but while only exploring the statistical ...
Introduction Intelligent reflecting surfaces (IRS), also called reconfigurable intelligent surfaces [1] , and software-controlled metasurfaces [2] , have recently attracted great interest. ...
doi:10.3390/s22062390
pmid:35336560
pmcid:PMC8948803
fatcat:wypfslo5rrforcati4z7thni6u
Intelligent Reflecting Surface Aided Multicasting with Random Passive Beamforming
[article]
2020
arXiv
pre-print
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In this letter, we consider a multicast system where a single-antenna transmitter sends a common message to multiple single-antenna users, aided by an intelligent reflecting surface (IRS) equipped with ...
For the proposed scheme, we first derive a closed-form approximation of the outage probability, based on which the optimal Q with best outage performance can be efficiently obtained. ...
Particularly, the existing works on IRS have mostly considered a "fully intelligent" reflecting surface with the availability of full channel state information (CSI) for all the IRS-associated links (see ...
arXiv:2009.00274v1
fatcat:mlc6twbumnfppbfwgkshrdfttu
Exploiting Amplitude Control in Intelligent Reflecting Surface Aided Wireless Communication with Imperfect CSI
[article]
2021
arXiv
pre-print
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2020 pre-print arXiv:2005.07002v2 fatcat:54msl2bmzneaxi2vbsnkdfxkjqOther Versions
to maximize the users' weighted sum-rate. ...
the IRS reflection coefficients for maximizing the achievable data transmission rate subjected to CSI errors; while for the multiuser case, a new penalty dual decomposition (PDD)-based algorithm is proposed ...
Index Terms Intelligent reflecting surface, channel estimation, imperfect CSI, reflection amplitude control, phaseshift control, rate maximization.
I. ...
arXiv:2005.07002v3
fatcat:qwlvwhnsznamxi2jlasunuhohm
Deep-Unfolding Beamforming for Intelligent Reflecting Surface assisted Full-Duplex Systems
[article]
2021
arXiv
pre-print
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In this paper, we investigate an intelligent reflecting surface (IRS) assisted multi-user multiple-input multiple-output (MIMO) full-duplex (FD) system. ...
Specifically, the high-dimensional passive beamforming matrix at the IRS is updated based on the channel statistics while the active beamforming matrices are optimized relied on the low-dimensional real-time ...
Lu, “Sum-rate optimization 9, pp. 4331-4340, Sep. 2011.
for two way communications with intelligent reflecting surface,” IEEE [47] B. Zheng, C. You, and R. ...
arXiv:2112.02305v1
fatcat:p52vk7fkazdena4ahojgkd722m
Intelligent-Reflecting-Surface-Assisted UAV Communications for 6G Networks
[article]
2023
arXiv
pre-print
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In 6th-Generation (6G) mobile networks, Intelligent Reflective Surfaces (IRSs) and Unmanned Aerial Vehicles (UAVs) have emerged as promising technologies to address the coverage difficulties and resource ...
In this article, we conduct a comprehensive survey on IRS-assisted UAV communications for 6G networks. ...
Therefore, most beamforming designs for IRSs are based on statistical/mixed CSI [88] , using statistical CSI of IRSs as a substitute for part of the instantaneous IRS to balance the channel estimation ...
arXiv:2310.20242v1
fatcat:favprbezjvgezlkyvvvhg3ofzy
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