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Intelligent reflecting surfaces (IRSs) have emerged as a cost-effective technology for terahertz (THz) communications by enabling programmable control of the wireless environment. This paper provides a comprehensive overview of IRSs-aided…

Signal Processing · Electrical Eng. & Systems 2025-06-23 Qingqing Wu , Yanze Zhu , Qiaoyan Peng , Wanming Hao , Yanzhao Hou , Fengyuan Yang , Wencai Yan , Guoning Wang , Wen Chen , Chi Qiu

By moving from massive antennas to antenna surfaces for software-defined wireless systems, the reconfigurable intelligent surfaces (RISs) rely on arrays of unit cells to control the scattering and reflection profiles of signals, mitigating…

Signal Processing · Electrical Eng. & Systems 2021-12-22 Brian Kim , Tugba Erpek , Yalin E. Sagduyu , Sennur Ulukus

This paper presents a literature review on recent applications and design aspects of the intelligent reflecting surface (IRS) in the future wireless networks. Conventionally, the network optimization has been limited to transmission control…

Information Theory · Computer Science 2020-07-28 Shimin Gong , Xiao Lu , Dinh Thai Hoang , Dusit Niyato , Lei Shu , Dong In Kim , Ying-Chang Liang

The use of automotive radars is gaining popularity as a means to enhance a vehicle's sensing capabilities. However, these radars can suffer from interference caused by transmissions from other radars mounted on nearby vehicles. To address…

Signal Processing · Electrical Eng. & Systems 2024-04-26 Shree Prasad Maruthi , Karrthik G. K. , Vijaya Krishna A. , Mahbub Hassan , Jinhong Yuan

Free-space optical (FSO) systems are able to offer the high data-rate, secure, and cost-efficient communication links required for applications such as wireless front- and backhauling for 5G and 6G communication networks. Despite the…

Signal Processing · Electrical Eng. & Systems 2021-05-28 Vahid Jamali , Hedieh Ajam , Marzieh Najafi , Bernhard Schmauss , Robert Schober , H. Vincent Poor

This paper investigates the physical layer security of a Reconfigurable Intelligent Surface (RIS)-aided wireless network in the presence of full-duplex active eavesdropping. In this scenario, the RIS cooperates with the Base Station (BS) to…

Information Theory · Computer Science 2024-11-28 Atefeh Zakeri , S. Mohammad Razavizadeh

In this paper, we investigate how an illegitimate user can use a reconfigurable intelligent surface (RIS) to maximally degrade the secrecy performance of the legitimate system. We first consider the case when the illegitimate user performs…

Information Theory · Computer Science 2023-04-21 Xinwu Chen , Shuai Han , Hai Jiang

Reconfigurable Intelligent Surface (RIS) draws great attentions in academic and industry due to its passive and low power consumption nature, and has currently been used in physical layer security to enhance the secure transmission.…

Information Theory · Computer Science 2021-12-21 Limeng Dong , Hui-Ming Wang , Jiale Bai

Intelligent reflecting surface (IRS) has emerged as a promising technique to enhance wireless communication performance cost effectively. The existing literature has mainly considered IRS being deployed near user terminals to improve their…

Information Theory · Computer Science 2022-05-27 Yuwei Huang , Weidong Mei , Rui Zhang

Reconfigurable Intelligent Surface (RIS) assisted physical layer key generation has shown great potential to secure wireless communications by smartly controlling signals such as phase and amplitude. However, previous studies mainly focus…

Signal Processing · Electrical Eng. & Systems 2023-10-17 Ningya Xu , Guoshun Nan , Xiaofeng Tao

The performance of wireless communication systems is fundamentally constrained by the random and uncontrollable wireless channel. By leveraging the recent advance in digitally-controlled metasurface, intelligent reflecting surface (IRS) has…

Information Theory · Computer Science 2022-04-06 Changsheng You , Beixiong Zheng , Weidong Mei , Rui Zhang

We propose and analyze secret key generation using intelligent reflecting surface (IRS) assisted wireless communication networks. To this end, we first formulate the minimum achievable secret key capacity for an IRS acting as a passive…

Signal Processing · Electrical Eng. & Systems 2021-03-10 Zijie Ji , Phee Lep Yeoh , Deyou Zhang , Gaojie Chen , Yan Zhang , Zunwen He , Hao Yin , Yonghui Li

Intelligent reflecting surface (IRS) has recently been emerging as an enabler for smart radio environment in which passive antenna arrays can be used to actively tailor/control the radio propagation. With multiple IRSs being launched to…

Signal Processing · Electrical Eng. & Systems 2021-12-09 Tu V. Nguyen , Diep N. Nguyen

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. This chapter investigates the…

Signal Processing · Electrical Eng. & Systems 2026-02-24 Yashuai Cao , Hetong Wang , Tiejun Lv , Wei Ni

Reconfigurable Intelligent Surfaces (RIS) have emerged as a transformative technology capable of reshaping wireless environments through dynamic manipulation of electromagnetic waves. While extensive research has explored their theoretical…

Cryptography and Security · Computer Science 2025-12-19 Ziyu Chen , Yitong Shen , Jingzhe Zhang , Yao Zheng , Yili Ren , Xuyu Wang , Shiwen Mao , Hanqing Guo

One of the great potentials to improve the confidentiality in mmWave/THz at the physical layer of technical communication, measured by the secrecy rate, lies in the use of reconfigurable intelligent surfaces (RISs). However, an important…

Signal Processing · Electrical Eng. & Systems 2024-01-30 Chu Li , Stefan Roth , Aydin Sezgin

In this article, we overview intelligent reflecting surface (IRS)-empowered wireless communication systems. We first present the fundamentals of IRS-assisted wireless transmission. On this basis, we explore the integration of IRS with…

Information Theory · Computer Science 2021-01-20 Ming Zeng , Ebrahim Bedeer , Xingwang Li , Quoc-Viet Pham , Octavia A. Dobre , Paul Fortier , Leslie A. Rusch

Reconfigurable intelligent surfaces (RISs) are recognized with great potential to strengthen wireless security, yet the performance gain largely depends on the deployment location of RISs in the network topology. In this paper, we consider…

Signal Processing · Electrical Eng. & Systems 2023-03-01 Xiao Tang , Hongliang He , Limeng Dong , Lixin Li , Qinghe Du , Zhu Han

Wireless communications empowered by Reconfigurable Intelligent (meta)Surfaces (RISs) are recently gaining remarkable research attention due to the increased system design flexibility offered by RISs for diverse functionalities. In this…

Information Theory · Computer Science 2020-11-03 George C. Alexandropoulos , Konstantinos Katsanos , Miaowen Wen , Daniel B. da Costa

Intelligent reflecting surface (IRS) has recently emerged as a new solution to enhance wireless communication performance via passive signal reflection. In this letter, we unlock the potential of IRS controller in relaying information and…

Information Theory · Computer Science 2021-06-24 Beixiong Zheng , Rui Zhang