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Cognitive radio (CR) is an effective solution to improve the spectral efficiency (SE) of wireless communications by allowing the secondary users (SUs) to share spectrum with primary users. Meanwhile, intelligent reflecting surface (IRS),…

Signal Processing · Electrical Eng. & Systems 2019-12-24 Jie Yuan , Ying-Chang Liang , Jingon Joung , Gang Feng , Erik G. Larsson

The next generation of wireless systems will take the concept of communications and networking to another level through the seamless integration of terrestrial, aerial, satellite, maritime and underwater communication systems.…

Networking and Internet Architecture · Computer Science 2022-08-02 Parisa Ramezani , Bin Lyu , Abbas Jamalipour

Reconfigurable intelligent surfaces (RISs) are rapidly gaining prominence in the realm of fifth generation (5G)-Advanced, and predominantly, sixth generation (6G) mobile networks, offering a revolutionary approach to optimizing wireless…

Information Theory · Computer Science 2024-06-17 Ertugrul Basar , George C. Alexandropoulos , Yuanwei Liu , Qingqing Wu , Shi Jin , Chau Yuen , Octavia A. Dobre , Robert Schober

Intelligent reflecting surface (IRS), which is capable to adjust propagation conditions by controlling phase shifts of the reflected waves that impinge on the surface, has been widely analyzed for enhancing the performance of wireless…

Systems and Control · Electrical Eng. & Systems 2021-06-29 Shuhang Zhang , Hongliang Zhang , Boya Di , Yunhua Tan , Marco Di Renzo , Zhu Han , H. Vincent Poor , Lingyang Song

Intelligent reflecting/refracting surface (IRS) is envisioned as a promising technology to reconfigure wireless propagation environment for enhancing the communication performance, by smartly controlling the signal reflection/refraction…

Information Theory · Computer Science 2023-10-18 Zixuan Huang , Lipeng Zhu , Rui Zhang

Reconfigurable Intelligent Surfaces (RISs) have emerged as a promising technology to enhance wireless communication systems by enabling dynamic control over the propagation environment. However, practical experiments are crucial towards the…

Information Theory · Computer Science 2025-02-18 Dimitris Vordonis , Dimitris Kompostiotis , Vassilis Paliouras , George C. Alexandropoulos , Florin Grec

This paper proposes a wearable-controlled mobile manipulator system for intelligent smart home assistance, integrating MEMS capacitive microphones, IMU sensors, vibration motors, and pressure feedback to enhance human-robot interaction. The…

Robotics · Computer Science 2025-04-21 Xiao Jin , Bo Xiao , Huijiang Wang , Wendong Wang , Zhenhua Yu

This paper presents a sophisticated reconfigurable metasurface architecture that introduces an advanced concept of flexible full-array space-time wavefront manipulation with enhanced dynamic capabilities. The practical 2-bit phase-shifting…

Signal Processing · Electrical Eng. & Systems 2024-07-30 Yufei Zhao , Yuan Feng , Afkar Mohamed Ismail , Ziyue Wang , Yong Liang Guan , Yongxin Guo , Chau Yuen

Recently, intermittent computing (IC) has received tremendous attention due to its high potential in perpetual sensing for Internet-of-Things (IoT). By harvesting ambient energy, battery-free devices can perform sensing intermittently…

Networking and Internet Architecture · Computer Science 2023-08-17 Gaosheng Liu , Lin Wang

Reconfigurable intelligent surfaces (RISs) have emerged as a key technology for shaping smart wireless environments in next-generation wireless communication systems. To support the large-scale deployment of RISs, a reliable and efficient…

Reconfigurable Intelligent Surfaces (RISs) are announced as a truly transformative technology, capable of smartly shaping wireless environments to optimize next-generation communication networks. Among their numerous foreseen applications,…

Signal Processing · Electrical Eng. & Systems 2023-06-21 Moustafa Rahal , Benoit Denis , Taghrid Mazloum , Frederic Munoz , Raffaele D Errico

The technology of Reconfigurable Intelligent Surfaces (RISs) is lately being considered as a boosting component for various indoor wireless applications, enabling wave propagation control and coverage extension. However, the incorporation…

Information Theory · Computer Science 2025-01-23 Fabio Cardoso , Sérgio Matos , Luís M. Pessoa , George C. Alexandropoulos

In opportunistic cognitive radio networks, when the primary signal is very weak compared to the background noise, the secondary user requires long sensing time to achieve a reliable spectrum sensing performance, leading to little remaining…

Information Theory · Computer Science 2024-04-29 Jungang Ge , Ying-Chang Liang , Sumei Sun , Yonghong Zeng , Zhidong Bai

Fluid reconfigurable intelligent surfaces (FRIS) extend conventional reconfigurable intelligent surfaces (RIS) by adding spatial reconfigurability through switchable apertures, pattern-reconfigurable units, fluidic conductive materials, or…

Information Theory · Computer Science 2026-05-22 Xusheng Zhu , Kai-Kit Wong , Sai Xu , Hao Xu , Wen Chen , Hyundong Shin

To enhance wireless communication in IoT systems using reconfigurable intelligent surfaces (RISs), efficient control of programmable passive and active elements is essential. However, increasing RIS elements requires more microcontrollers,…

Information Theory · Computer Science 2025-02-14 Shakil Ahmed , Ahmed E. Kamal , Mohamed Y. Selim

With the advancement of sensing technologies over the years, it has become critical to ensure the seamless connectivity of the Internet of Things (IoT) gadgets. With the advancement of communication technology, cellular networks are…

Signal Processing · Electrical Eng. & Systems 2022-07-19 Mobasshir Mahbub , Raed M. Shubair

Intelligent reflection surface (IRS) is emerging as a promising technique for future wireless communications. Considering its excellent capability in customizing the channel conditions via energy-focusing and energy-nulling, it is an ideal…

Information Theory · Computer Science 2021-08-31 Shihao Yan , Xiaobo Zhou , Derrick Wing Kwan Ng , Jinhong Yuan , Naofal Al-Dhahir

The idea of using a Reconfigurable Intelligent Surface (RIS) consisting of a large array of passive scattering elements to assist wireless communication systems has recently attracted much attention from academia and industry. A central…

Information Theory · Computer Science 2021-05-14 Zipeng Wang , Li Tan , Haifan Yin , Kai Wang , Xilong Pei , David Gesbert

In this paper, we propose a multi-RIS-aided wireless imaging framework in 3D facing the distributed placement of multi-sensor networks. The system creates a randomized reflection pattern by adjusting the RIS phase shift, enabling the…

Image and Video Processing · Electrical Eng. & Systems 2023-11-21 Fuhai Wang , Chun Wang , Rujing Xiong , Zhengyu Wang , Tiebin Mi , Robert Caiming Qiu

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. In this paper,…

Information Theory · Computer Science 2020-01-22 S. Mohammad Razavizadeh , Tommy Svensson