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Author

George C. Alexandropoulos

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Sep 2026

Diffusion-Based Semantic Communications with Scene Graph Enhancement

Semantic communication improves transmission efficiency under resource constraints by transmitting semantic information rather than raw data. However, under poor channel conditions, a recovered transmitted image is often blurred and loses fine texture. Although generative models offer a promising solution for semantic...

Hao Liu, Bo Yang, Zhi-Wen Yu et al. · 0 citations
Preprint Aug 2026

$Z^2$-ACT: End-to-End Verifiable Agentic Intent Control for Open 6G RAN

This work proposes zero-knowledge auditable control and zero-trust verifiable agentic intent architecture ($Z^2$-ACT), which integrates the aforementioned four primitives across the non-real-time and near-real-time RICs.

S. A. Khowaja, K. Dev, George C. Alexandropoulos · 0 citations
Preprint Aug 2026

Energy Efficient Multi-User Beamforming and 3D Position Optimization for SIM-Assisted UAVs

This paper studies energy-efficient downlink multi-user transmissions with unmanned aerial vehicle (UAV) communication systems equipped with stacked intelligent metasurfaces (SIM), enabling wave-domain analog beamforming through multiple cascaded metasurface layers, while low-dimensional digital precoding is carried ou...

Chandan Kumar Sheemar, Giovanni Iacovelli, Sourabh Solanki et al. · 1 citation

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