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Themistoklis Charalambous

2 papers indexed

arxiveess.SP2026-07-22

Lightweight Gated Recurrent Unit Variants for Real-Time Channel Prediction

Kyriakos Christodoulides, Kyriakos M. Deliparaschos, Risto Wichman, Themistoklis Charalambous

Machine-learning-based channel predictors must operate under stringent latency, memory, and computational constraints while remaining robust to noisy and time-varying observations. This paper develops a causal channel-prediction framework based on three single-layer gated recurre…

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arxiveess.SY2026-07-01

Reachability Analysis With Probabilistic Zonotopes: Learning Realized Disturbances and Refining Aleatory Uncertainty

Amir Modares, Zhen Zhang, Themistoklis Charalambous, Amr Alanwar, Hamidreza Modares

This paper develops a data-driven reachability framework for linear systems whose disturbances are modeled by probabilistic zonotopes (PZs), combining bounded deterministic and Gaussian stochastic components. In contrast to methods that require a precisely known disturbance model…

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