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Reconfigurable Intelligent Surfaces in 6G: Reflective, Transmissive, or Both? [article]

Shuhao Zeng, Hongliang Zhang, Boya Di, Yunhua Tan, Zhu Han, H. Vincent Poor, Lingyang Song
2021 arXiv   pre-print
Reconfigurable intelligent surfaces (RISs) have attracted wide interest from industry and academia since they can shape the wireless environment into a desirable form with a low cost.  ...  In practice, RISs have three types of implementations: 1) reflective, where signals can be reflected to the users on the same side of the base station (BS), 2) transmissive, where signals can penetrate  ...  Reconfigurable Intelligent Surfaces An RIS is composed of M × N sub-wavelength elements, each with the size of l M × l N .  ... 
arXiv:2102.06910v1 fatcat:tlud7jzjonb47a4t52tcd5y6v4

Applications and challenges of Reconfigurable Intelligent Surface for 6G networks (Original published in Chinese) [article]

Yajun Zhao, Mengnan Jian
2021 arXiv   pre-print
Reconfigurable intelligent surface has attracted the attention of academia and industry as soon as it appears because it can flexibly manipulate the electromagnetic characteristics of wireless channel.  ...  Especially in the past one or two years, RIS has been developing rapidly in academic research and industry promotion and is one of the key candidate technologies for 5G-Advanced and 6G networks.  ...  In recent years, reconfigurable intelligent surface (RIS) has attracted extensive attention in the academic and industry since it can flexibly manipulate the electromagnetic characteristics in the channel  ... 
arXiv:2108.13164v1 fatcat:bzzsd4lhmzdgthp7lren2boywi

Modeling and Analysis of Reconfigurable Intelligent Surfaces for Indoor and Outdoor Applications in Future Wireless Networks [article]

I. Yildirim, A. Uyrus, E. Basar
2020 arXiv   pre-print
Reconfigurable intelligent surface (RIS)-empowered communication is one of the promising 6G technologies that allows the conversion of the wireless channel into an intelligent transmit entity by manipulating  ...  the impinging waves using man-made surfaces.  ...  Most of the promising methods for next-generation wireless networks are mainly based on the intelligence or reconfigurability of the building blocks of communication systems.  ... 
arXiv:1912.07350v4 fatcat:gne6mmkvxjendgji7crvsi4hdq

Reconfigurable Intelligent Surfaces for Future Wireless Networks: A Channel Modeling Perspective [article]

E. Basar, I. Yildirim
2021 arXiv   pre-print
While the researchers have set their sights on future wireless networks of 2030, communications through reconfigurable intelligent surfaces (RISs) appears as one of the potential enabling technologies  ...  for 6G wireless networking.  ...  RECONFIGURABLE INTELLIGENT SURFACES: HOW DO THEY WORK?  ... 
arXiv:2008.01448v4 fatcat:q2wei5j6njh2tcjmqj37wk6wwe

The Interplay of Reconfigurable Intelligent Surfaces and Mobile Edge Computing in Future Wireless Networks: A Win-Win Strategy to 6G [article]

Mithun Mukherjee and Vikas Kumar and Mian Guo and Daniel Benevides da Costa and Ertugrul Basar and Zhiguo Ding
2021 arXiv   pre-print
Reconfigurable intelligent surface (RIS)-empowered communication is being considered as an enabling technology for sixth generation (6G) wireless networks.  ...  Finally, the key research trends in the RIS-assisted MEC are discussed.  ...  RIS Reconfigurable Intelligent Surfaces (RISs): Fundamentals The advancement in programmable meta-materials has sparked an emerging technology, reconfigurable intelligent surfaces (RISs)-assisted communication  ... 
arXiv:2106.11784v1 fatcat:hhyhdeijtvcofma3vz2nnzvnza

Reconfigurable Intelligent Surfaces in Action for Non-Terrestrial Networks [article]

Kürşat Tekbıyık, Güneş Karabulut Kurt, Ali Rıza Ekti, Halim Yanikomeroglu
2022 arXiv   pre-print
In this regard, we propose the use of reconfigurable intelligent surfaces (RIS) to improve coordination between these networks given that RIS perfectly match the size, weight, and power restrictions of  ...  operating in space.  ...  Open issues for the realization of RIS-assisted NTNs and DSNs are highlighted in Section V. Section VI concludes the study. II. WHY RECONFIGURABLE INTELLIGENT SURFACE?  ... 
arXiv:2012.00968v4 fatcat:fiw4zvotavbctbpawjjwfz2coe

Reconfigurable Intelligent Surface-Aided Joint Radar and Covert Communications: Fundamentals, Optimization, and Challenges [article]

Hongyang Du, Jiawen Kang, Dusit Niyato, Jiayi Zhang, Dong In Kim
2022 arXiv   pre-print
Fortunately, reconfigurable intelligent surfaces (RISs) can change the signal propagation smartly to improve the networks performance with low cost.  ...  In the JRCC system, an existence of sensitive data transmission is hidden from a maliciously observant warden.  ...  Index Terms-Covert communication, game theory, joint radar and communication, reconfigurable intelligent surface I.  ... 
arXiv:2203.02704v2 fatcat:up6joozy3bg5viwd32lqq3hld4

Capacity Improvement in Reconfigurable Intelligent Surface Assisted MIMO Communications

Jun Yang, Yijian Chen, Mengnan Jian, Jianwu Dou, Min Fang
2021 IEEE Access  
INTRODUCTION R ECONFIGURABLE intelligent surface (RIS), also known as intelligent reflecting surface (IRS) [1] , large intelligent surface (LIS) [2] , among others [3] , [4] , has become a hot topic  ...  These elements form a low-profile 2D reflecting or transmission array, which is able to manipulate the phase, amplitude, polarization or frequency of the incident electromagnetic waves.  ... 
doi:10.1109/access.2021.3113917 fatcat:2arhmz35zjb57a4yp3s7qdmfga

3D Beamforming in Reconfigurable Intelligent Surfaces-assisted Wireless Communication Networks [article]

S. Mohammad Razavizadeh, Tommy Svensson
2020 arXiv   pre-print
Reconfigurable Intelligent Surfaces (RIS) or Intelligent Reflecting Surfaces (IRS) are metasurfaces that can be deployed in various places in wireless environments to make these environments controllable  ...  and reconfigurable.  ...  However, recent studies show that by proper placement of Reconfigurable Intelligent Surfaces (RISs); a.k.a., intelligent reflecting surfaces (IRSs), smart surfaces and large intelligent metasurfaces (LIMs  ... 
arXiv:2001.06653v1 fatcat:vtjezgzg7bfxbjfluramefg63e

Reconfigurable Intelligent Surfaces for Doppler Effect and Multipath Fading Mitigation

Ertugrul Basar
2021 Frontiers in Communications and Networks  
Within this respective, reconfigurable intelligent surface (RIS)-empowered communication appears as a potential candidate to overcome the inherent drawbacks of legacy wireless systems.  ...  The feasibility of eliminating or mitigating the multipath fading effect stemming from the movement of mobile receivers is also investigated by utilizing RISs.  ...  In recent years, reconfigurable intelligent surfaces (RISs) have been brought to the attention of the wireless research community to enable the control of wireless environments Di Renzo, 2019) .  ... 
doi:10.3389/frcmn.2021.672857 fatcat:aqlp6dtbpbfghjw5jddz6zhpsm

A Comprehensive Study of Reconfigurable Intelligent Surfaces in Generalized Fading [article]

Imène Trigui, Wessam Ajib, Wei-Ping Zhu
2020 arXiv   pre-print
Leveraging on the reconfigurable intelligent surface (RIS) paradigm for enabling the next Internet of Things (IoT) and 6G era, this paper develops a comprehensive theoretical framework characterizing the  ...  We show that there is a great potential to improve the outage performance and thereby the capacity when fewer RISs are deployed each with more reflecting elements.  ...  Among these emerging technologies, reconfigurable intelligent surfaces (RISs) [2] , [3] , have been introduced with an overarching vision of artificially controlling the wireless environment as to increase  ... 
arXiv:2004.02922v2 fatcat:wxaiqxc27vasdp4deiwmyik74y

Spectral Efficiency vs Complexity in Downlink Algorithms for Reconfigurable Intelligent Surfaces [article]

Pooja Nuti, Brian L. Evans
2020 arXiv   pre-print
Reconfigurable Intelligent Surfaces (RIS) are an emerging technology that can be used to reconfigure the propagation environment to improve cellular communication link rates.  ...  The downlink narrowband transmission uses sub-6 GHz frequency bands, and the user equipment has a single antenna.  ...  Reconfigurable Intelligent Surfaces (RISs) or large intelligent surfaces (LISs) are an emerging technology expected for 6G which can reconfigure the propagation environment [3] - [7] .  ... 
arXiv:2011.04859v1 fatcat:jzy6xla5drd3ndsgl74n2is7um

Indoor and Outdoor Physical Channel Modeling and Efficient Positioning for Reconfigurable Intelligent Surfaces in mmWave Bands [article]

E. Basar, I. Yildirim, F. Kilinc
2021 arXiv   pre-print
Reconfigurable intelligent surface (RIS)-assisted communication appears as one of the potential enablers for sixth generation (6G) wireless networks by providing a new degree of freedom in the system design  ...  The scenarios in which the use of an RIS makes a big difference or might not have a big impact on the communication system performance, are revealed.  ...  intelligent surfaces (RISs), cell-free networks, and integrated space and terrestrial networks.  ... 
arXiv:2006.02240v3 fatcat:gown5do3rfehxm2ov2kwjd3adm

Double-Sided Beamforming in OWC Systems Using Omni-Digital Reconfigurable Intelligent Surfaces [article]

Alain R. Ndjiongue, Telex M. N. Ngatched, Octavia A. Dobre, Harald Haas
2022 arXiv   pre-print
In this paper, we introduce a variant of reconfigurable intelligent surfaces (RISs) called omni-digital-RISs (DRISs), which allow multiple physical processes, with application to optical wireless communications  ...  The proposed omni-DRIS contains both reflectors and refractive elements, as well as elements that perform both simultaneously.  ...  INTRODUCTION The advantages of reconfigurable intelligent surfaces (RISs) extend beyond solving the skip zone problem in wireless communication systems.  ... 
arXiv:2203.03781v1 fatcat:k2vbldai5ndipafdyns36mb2t4

Joint Beamforming and Phase Optimization in a Multi-user Communication System Composed of Dual Reconfigurable Intelligent Surfaces [article]

RuiTianYi Lu
2021 arXiv   pre-print
Reconfigurable Intelligent Surface (RIS) has becoming a useful tool in future wireless communication systems for close-distance communication network.  ...  Based on the electromagnetic property of Reconfigurable Intelligent Surface (RIS), like two mirrors that are opposite each other, setting two Reconfigurable Intelligent Surface (RIS) attached to the city  ...  The appearance of intelligent reflective surface satisfies the characteristic of 6G short wave length and has the practicability of being used in high-rise buildings.  ... 
arXiv:2102.00767v1 fatcat:x5ywrm5wyzgllj2kpqy7oioyay
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