9 papers
A Family of Hybrid Beyond-Diagonal RIS Architectures: Design and Performance Analysis
Konstantinos Ntougias, Ioannis Krikidis
Beyond-diagonal reconfigurable intelligent surfaces (BD-RISs) extend conventional diagonal RISs by allowing inter-element coupling, thereby enlarging the set of attainable scatteri…
Secure and Robust Beamforming Design for STAR-RIS-aided MU-MIMO ISAC Systems
Rakesh Ranjan, Anshu Mukherjee, Manjesh K. Hanawal +2
Simultaneous transmitting and reflecting reconfigurable intelligent surfaces (STAR-RIS) offer a transformative approach for integrated sensing and communication (ISAC) systems, par…
Improving Reliability of Hybrid Bit-Semantic Communications for Cellular Networks
Nikos G. Evgenidis, Sotiris A. Tegos, Panagiotis D. Diamantoulakis +2
Semantic communications (SemComs) have been considered as a promising solution to reduce the amount of transmitted information, thus paving the way for more energy-and spectrum-eff…
Joint Power Allocation and Reflecting-Element Activation for Energy Efficiency Maximization in IRS-Aided Communications Under CSI Uncertainty
Christos N. Efrem, Ioannis Krikidis
We study the joint power allocation and reflecting element (RE) activation to maximize the energy efficiency (EE) in communication systems assisted by an intelligent reflecting sur…
Quantum Optimization in Wireless Communication Systems: Principles and Applications
Ioannis Krikidis, Valentin Gilbert
Quantum optimization is poised to play a transformative role in the design of next-generation wireless communication systems by addressing key computational and technological chall…
Asymmetric Modulation Design for Fluid-Antenna SWIPT Systems
Ahsan Mehmood, Ioannis Krikidis, Ghassan M. Kraidy
In this work, we propose the design of modulation schemes that improve the rate-energy region of fluid antenna-assisted simultaneous wireless information and power transfer (SWIPT)…