11 papers
RIS-Enabled Spoofing Against Adversary Sensing: CRB-Maximizing Design and Decoying Analysis
Ioannis Gavras, Giuseppe Thadeu Freitas de Abreu, George C. Alexandropoulos
This paper studies the capability of a Reconfigurable Intelligent Surface (RIS), when transparently covering a User Equipment (UE), to deceive an adversary monostatic radar system.…
RIS-Enabled Smart Wireless Environments: Fundamentals and Distributed Optimization
George C. Alexandropoulos, Kostantinos D. Katsanos, George Stamatelis +1
This chapter overviews the concept of Smart Wireless Environments (SWEs) motivated by the emerging technology of Reconfigurable Intelligent Surfaces (RISs). The operating principle…
2D Waveguide-Fed Metasurface Antenna Arrays: Modeling and Optimization for Bistatic Sensing
Ioannis Gavras, Panagiotis Gavriilidis, George C. Alexandropoulos
This paper presents a physics-consistent framework for bistatic sensing incorporating a 2-Dimensional (2D) waveguide-fed metasurface antenna array capable of realizing eXtremely-La…
Hybrid RISs for Simultaneous Tunable Reflections and Sensing
George C. Alexandropoulos, Nir Shlezinger, Ioannis Gavras +1
The concept of smart wireless environments envisions dynamic programmable propagation of information-bearing signals through the deployment of Reconfigurable Intelligent Surfaces (…
Communications-Centric Secure ISAC with Hybrid Reconfigurable Intelligent Surfaces
Ioannis Gavras, George C. Alexandropoulos
Hybrid reconfigurable intelligent surfaces (HRISs) constitute an emerging paradigm of metasurfaces that empowers the concept of smart wireless environments, inherently supporting s…
Tracking-Aided Multi-User MIMO Communications with Hybrid Reconfigurable Intelligent Surfaces
Ioannis Gavras, George C. Alexandropoulos
Hybrid Reconfigurable Intelligent Surfaces (HRISs) constitute a new paradigm that redefines smart metasurfaces, not only offering tunable reflections of incoming signals, but also…