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Reconfiguring wireless environments via intelligent surfaces for 6G: reflection, modulation, and security

Science China(Information Sciences) 2023年第3期66卷 60-79页

作者： Jindan XU Chau YUEN Chongwen HUANG Naveed UL HASSAN George C.ALEXANDROPOULOS marco DI RENZO mérouane debbah Engineering Product Development Pillar Singapore University of Technology and Design College of Information Science and Electronic Engineering Zhejiang University Department of Electrical Engineering Lahore University of Management Sciences Department of Informatics and Telecommunications National and Kapodistrian University of Athens Technology Innovation Institute Université Paris-Saclay CNRS Centrale Supélec Laboratoire des Signaux et Systèmes

The reconfigurable intelligent surface(RIS) has been recognized as an essential enabling technology for sixth-generation(6G) mobile communication networks. An RIS comprises a large number of small and low-cost reflecting elements whose parameters can be dynamically adjusted with a programmable *** of these elements can effectively reflect a phase-shifted version of the incident electromagnetic wave. By configuring the wave phases in real time, the propagation environment of the information-bearing signals can be dynamically manipulated to enhance communication reliability, boost transmission rate, expand cellular coverage, and strengthen communication security. In this study, we provide an overview on RIS-assisted wireless communications. Specifically, we elaborate on the state-of-the-art enabling techniques for the RIS technology as well as their corresponding substantial benefits from the perspectives of RIS reflection and RIS modulation. With these benefits, we envision the integration of RISs into emerging applications for6G. In addition, communication security is of unprecedented importance in future 6G networks with ubiquitous wireless services in multifarious verticals and areas. We highlight potential contributions of RISs to physical-layer security, in terms of secrecy rate and secrecy outage probability, exemplified by a typical case study from both theoretical and numerical aspects. Finally, we discuss challenges and opportunities on the deployment of RISs in practice to motivate future research.

关键词： reconfigurable intelligent surface physical-layer security RIS-assisted wireless communications phase modulation 6G

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Wireless communications empowered by reconfigurable intelligent surfaces: model-based vs model-free channel estimation

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Journal of Information and Intelligence 2023年第3期1卷 253-266页

作者： Li Wei Chongwen Huang George C.Alexandropoulos Ahmet m.Elbir Zhaohui Yang Zhaoyang Zhang marco Di Renzo merouane debbah Chau Yuen Engineering Product Development Pillar Singapore University of Technology and DesignSingapore 487372Singapore College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China Department of Informatics and Telecommunications National and Kapodistrian University of Athens15784 AthensGreece Interdisciplinary Centre for Security Reliability and TrustUniversity of LuxembourgL-4365 Esch-sur-AlzetteLuxembourgand Duzce UniversityDuzce 81620Turkey Universite Paris-Saclay CNRSCentraleSupelecLaboratoire des Signaux et Systemes91192France Khalifa University of Science and Technology Abu DhabiUnited Arab Emirates School of Electrical and Electronics Engineering Nanyang Technological UniversitySingapore 639798Singapore

Reconfigurable intelligent surfaces(RISs)are lately being attractive for their great potential in future sixth generation wireless communications(6G),which is attributed to their affordable energy consumption and easy ***,the large numbers of low-cost reflecting elements comprising RISs impose challenges for channel acquisition in various RIS-based wireless applications,such as RIS-enhanced orthogonal frequency-division multiplexing and multi-user multipleinput multiple-output *** this article,we first overview the state-of-the-art RIS hardware architectures designed to assist channel estimation for RIS-empowered wireless communication *** also overview existing channel estimation approaches,which are categorized into model-based and model-free techniques,and discuss their advantages and limitations depending on the RIS *** challenges with RIS-empowered systems in terms of hardware and other parameter limitations are presented,together with future research directions for channel estimation in RIS-based wireless systems,such as RISs with extremely large numbers of elements,multi-hop communications with RISs,and frequency division duplexing for high mobility systems.

关键词： Reconfigurable intelligent surfaces Channel estimation model-based methods model-free methods

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mEASUREmENTS AND APPLICATIONS OF QoE FOR mULTImEDIA COmmUNICATIONS

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China Communications 2018年第10期15卷 I0002-I0004页

作者： Xiaoming Tao Jiajia Liu Shiwen mao merouane debbah Chunxiao Jiang the department of electronic engineering tsinghua university the school of cyber engineering xidian university the wireless engineering research and education center (werec) at auburn university the huawei france r&d center the mathematical and algorithmic sciences lab the huawei france r&d center tsinghua space center tsinghua university

With the rapid development of smart devices and mobile networks,multimedia services will dominate most of data traffic in 4G/5G *** -such as conversational videos,online multimedia sharing,remote education,*** gained ... 详细信息

关键词：多媒体通讯应用活动网络多媒体服务录像

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