39 papers
Certified coherent, informative, and non-entanglement-breaking fixed points of future-referential quantum feedback
Eran Kopel
We study quantum processes in which information extracted from a forward simulation is returned as input to an earlier internal time of the simulated dynamics: externally the proto…
Task-Oriented Sensing and Covert Transmissions for Collaborative Multi-AUV Systems
Xueyao Zhang, Chenyang Yan, Bo Yang +6
The paper proposes a multi‑agent reinforcement learning framework that quantifies the value of sensed information to enable collaborative, covert operations among autonomous underw…
RIS Beamforming under Element-Level Variations: Statistical Characterization and Robust Design
Dimitris Kompostiotis, Dimitris Vordonis, Vassilis Paliouras +1
The paper proposes a statistical model for element‑level variations in reconfigurable intelligent surfaces and uses it to design low‑complexity, robust beamforming configurations t…
TenSIM: Tensor-Based Channel Estimation for MIMO Systems with Stacked Intelligent Metasurfaces
André L. F. de Almeida, George C. Alexandropoulos
Stacked intelligent metasurfaces (SIMs) are emerging as a promising architecture for sixth-generation (6G) and beyond wireless systems, enabling richer electromagnetic-wave manipul…
Learning to Distributedly Estimate under Partially Known Dynamics: A Covariance-Agnostic Neural Kalman Consensus Filter
George Stamatelis, Kyriakos Stylianopoulos, George C. Alexandropoulos
Online latent state estimation constitutes a fundamental challenge within the artificial intelligence field, serving as a foundational tool for diverse applications, including sequ…
Robust Beamforming for Cell-Free Systems with Parallel-Plate-Waveguided Dynamic Metasurfaces
Konstantinos D. Katsanos, Panagiotis Gavriilidis, George C. Alexandropoulos
Dynamic Metasurface Antennas (DMAs) constitute a promising solution for extremely large antenna arrays, requiring lower power consumption and reduced hardware cost as compared to c…