no code implementations • 16 Dec 2024 • Nour Jamoussi, Giuseppe Serra, Photios A. Stavrou, Marios Kountouris
In this work, we study the problem of aggregation in the context of Bayesian Federated Learning (BFL).
no code implementations • 19 Sep 2024 • Ioannis Pitsiorlas, George Arvanitakis, Marios Kountouris
This work introduces a novel method for enhancing confidence in anomaly detection in Intrusion Detection Systems (IDS) through the use of a Variational Autoencoder (VAE) architecture.
no code implementations • 27 Aug 2024 • Giuseppe Serra, Photios A. Stavrou, Marios Kountouris
We employ the developed solutions in an alternating minimization scheme, namely Optimal Alternating Minimization (OAM), for which we provide convergence guarantees.
no code implementations • 19 Jul 2024 • Pouya Agheli, Nikolaos Pappas, Petar Popovski, Marios Kountouris
This paper studies decision-making for goal-oriented effective communication.
no code implementations • 19 Jun 2024 • Eunjeong Jeong, Marios Kountouris
Recent developments and emerging use cases, such as smart Internet of Things (IoT) and Edge AI, have sparked considerable interest in the training of neural networks over fully decentralized (serverless) networks.
no code implementations • 12 Feb 2024 • Emilio Calvanese Strinati, Paolo Di Lorenzo, Vincenzo Sciancalepore, Adnan Aijaz, Marios Kountouris, Deniz Gündüz, Petar Popovski, Mohamed Sana, Photios A. Stavrou, Beatriz Soret, Nicola Cordeschi, Simone Scardapane, Mattia Merluzzi, Lanfranco Zanzi, Mauro Boldi Renato, Tony Quek, Nicola di Pietro, Olivier Forceville, Francesca Costanzo, Peizheng Li
Recent advances in AI technologies have notably expanded device intelligence, fostering federation and cooperation among distributed AI agents.
no code implementations • 30 Jan 2024 • Ioannis Pitsiorlas, Argyro Tsantalidou, George Arvanitakis, Marios Kountouris, Charalambos Kontoes
This study presents a new approach for estimating confidence in machine learning model predictions, specifically in regression tasks utilizing Earth Observation (EO) data, with a particular focus on mosquito abundance (MA) estimation.
no code implementations • 24 Jan 2024 • Yuchang Sun, Marios Kountouris, Jun Zhang
We show that the generalization performance of a client can be improved only by collaborating with other clients that have more training data and similar data distribution.
no code implementations • 15 Jan 2024 • Hyeon Seok Rou, Giuseppe Thadeu Freitas de Abreu, Junil Choi, David González G., Marios Kountouris, Yong Liang Guan, Osvaldo Gonsa
Next-generation wireless systems will offer integrated sensing and communications (ISAC) functionalities not only in order to enable new applications, but also as a means to mitigate challenges such as doubly-dispersive channels, which arise in high mobility scenarios and/or at millimeter-wave (mmWave) and Terahertz (THz) bands.
no code implementations • 15 Nov 2023 • Giuseppe Serra, Photios A. Stavrou, Marios Kountouris
In this paper, we study the computation of the rate-distortion-perception function (RDPF) for a multivariate Gaussian source under mean squared error (MSE) distortion and, respectively, Kullback-Leibler divergence, geometric Jensen-Shannon divergence, squared Hellinger distance, and squared Wasserstein-2 distance perception metrics.
no code implementations • 10 Sep 2023 • Hyeon Seok Rou, Giuseppe Thadeu Freitas de Abreu, Junil Choi, David González G., Osvaldo Gonsa, Yong Liang Guan, Marios Kountouris
**PLEASE FIND THE FULL EXTENDED ARTICLE "From OTFS to AFDM: A Comparative Study of Next-Generation Waveforms for ISAC in Doubly-Dispersive Channels" (Accepted for publication at the IEEE Signal Processing Magazine - Special Issue on Signal Processing for the Integrated Sensing and Communications Revolution)** This white paper aims to briefly describe a proposed article that will provide a thorough comparative study of waveforms designed to exploit the features of doubly-dispersive channels arising in heterogeneous high-mobility scenarios as expected in the beyond fifth generation (B5G) and sixth generation (6G), in relation to their suitability to integrated sensing and communications (ISAC) systems.
no code implementations • 21 Jun 2023 • Sajad Daei, Saeed Razavikia, Marios Kountouris, Mikael Skoglund, Gabor Fodor, Carlo Fischione
Resource allocation and multiple access schemes are instrumental for the success of communication networks, which facilitate seamless wireless connectivity among a growing population of uncoordinated and non-synchronized users.
no code implementations • 7 Mar 2023 • Davit Gogolashvili, Matteo Zecchin, Motonobu Kanagawa, Marios Kountouris, Maurizio Filippone
Classic results show that the IW correction is needed when the model is parametric and misspecified.
no code implementations • 23 Feb 2023 • Eunjeong Jeong, Marios Kountouris
To cope with this issue, we propose a personalized and fully decentralized FL algorithm, leveraging knowledge distillation techniques to empower each device so as to discern statistical distances between local models.
no code implementations • 10 Nov 2022 • Chao Zhang, Hang Zou, Samson Lasaulce, Walid Saad, Marios Kountouris, Mehdi Bennis
Internet of Things (IoT) devices will play an important role in emerging applications, since their sensing, actuation, processing, and wireless communication capabilities stimulate data collection, transmission and decision processes of smart applications.
no code implementations • 1 Jul 2022 • Matteo Zecchin, Sangwoo Park, Osvaldo Simeone, Marios Kountouris, David Gesbert
In this context, we explore the application of the framework of robust Bayesian learning.
no code implementations • 31 May 2022 • Matteo Zecchin, Marios Kountouris, David Gesbert
Decentralized learning algorithms empower interconnected devices to share data and computational resources to collaboratively train a machine learning model without the aid of a central coordinator.
no code implementations • 3 Mar 2022 • Matteo Zecchin, Sangwoo Park, Osvaldo Simeone, Marios Kountouris, David Gesbert
Standard Bayesian learning is known to have suboptimal generalization capabilities under misspecification and in the presence of outliers.
no code implementations • 2 Mar 2022 • Matteo Zecchin, David Gesbert, Marios Kountouris
Decentralized learning empowers wireless network devices to collaboratively train a machine learning (ML) model relying solely on device-to-device (D2D) communication.
1 code implementation • 10 Feb 2022 • Apostolos Avranas, Marios Kountouris
We propose a neural network architecture for classification, in which the information that is relevant to each class flows through specific paths.
no code implementations • 2 Feb 2022 • Eunjeong Jeong, Matteo Zecchin, Marios Kountouris
Decentralized learning enables edge users to collaboratively train models by exchanging information via device-to-device communication, yet prior works have been limited to wireless networks with fixed topologies and reliable workers.
1 code implementation • 29 Apr 2021 • Matteo Zecchin, Mahdi Boloursaz Mashhadi, Mikolaj Jankowski, Deniz Gunduz, Marios Kountouris, David Gesbert
Efficient millimeter wave (mmWave) beam selection in vehicle-to-infrastructure (V2I) communication is a crucial yet challenging task due to the narrow mmWave beamwidth and high user mobility.
no code implementations • 27 Nov 2020 • Apostolos Avranas, Marios Kountouris, Philippe Ciblat
The problem of resource constrained scheduling in a dynamic and heterogeneous wireless setting is considered here.
no code implementations • 28 Jul 2020 • Matteo Zecchin, David Gesbert, Marios Kountouris
In the context of wireless networking, it was recently shown that multiple DNNs can be jointly trained to offer a desired collaborative behaviour capable of coping with a broad range of sensing uncertainties.
1 code implementation • 9 Jul 2013 • Emil Björnson, Jakob Hoydis, Marios Kountouris, Mérouane Debbah
The use of large-scale antenna arrays can bring substantial improvements in energy and/or spectral efficiency to wireless systems due to the greatly improved spatial resolution and array gain.
Information Theory Information Theory
1 code implementation • 11 Jul 2012 • Emil Björnson, Marios Kountouris, Mats Bengtsson, Björn Ottersten
Analytic results are derived to show how user selection, spatial correlation, heterogeneous user conditions, and imperfect channel acquisition (quantization or estimation errors) affect the performance when sending the maximal number of streams or one stream per scheduled user---the two extremes in data stream allocation.
Information Theory Information Theory