83 citations · 210 across the 18 of their papers we have counts for
19 papers
Kernel Regression with Tensor Trains and Hadamard Overparameterization
Duc Thien Nguyen, Konstantinos Slavakis, Eleftherios Kofidis +1
Kernel regression with tensor trains and Hadamard overparameterization (KReTTaH) is introduced as a training-data-free, interpretable, and nonparametric framework for multi-way dat…
Beyond Tensor Probabilistic Independent Component Analysis -- Putting Block-Term Decomposition and Independent Vector Analysis Together
Eleftherios Kofidis
Tensor probabilistic independent component analysis (TPICA) is a popular approach to analyzing functional magnetic resonance imaging (fMRI) data, which draws its popularity from it…
Block-Term Decomposition Approach to Blind Multi-trial Functional Ultrasound Unmixing
Sofia-Eirini Kotti, Eleftherios Kofidis, Borbála Hunyadi
Functional ultrasound (fUS) has emerged as a powerful neuroimaging modality due to its high resolution in both space and time, low cost and potential portability. Nevertheless, fUS…
Kernel Regression of Multi-Way Data via Tensor Trains with Hadamard Overparametrization: The Dynamic Graph Flow Case
Duc Thien Nguyen, Konstantinos Slavakis, Eleftherios Kofidis +1
A regression-based framework for interpretable multi-way data imputation, termed Kernel Regression via Tensor Trains with Hadamard overparametrization (KReTTaH), is introduced. KRe…
Federated Learning Using Coupled Tensor Train Decomposition
Xiangtao Zhang, Eleftherios Kofidis, Ce Zhu +2
Coupled tensor decomposition (CTD) can extract joint features from multimodal data in various applications. It can be employed for federated learning networks with data confidentia…
Tensor-based Channel Tracking for RIS-Empowered Multi-User MIMO Wireless Systems
Jide Yuan, George C. Alexandropoulos, Eleftherios Kofidis +2
The accurate estimation of Channel State Information (CSI) is of crucial importance for the successful operation of Multiple-Input Multiple-Output (MIMO) communication systems, esp…
Online Rank-Revealing Block-Term Tensor Decomposition
Athanasios A. Rontogiannis, Eleftherios Kofidis, Paris V. Giampouras
The so-called block-term decomposition (BTD) tensor model, especially in its rank- version, has been recently receiving increasing attention due to its enhanced abilit…
Block-Term Tensor Decomposition Model Selection and Computation: The Bayesian Way
Paris V. Giampouras, Athanasios A. Rontogiannis, Eleftherios Kofidis
The so-called block-term decomposition (BTD) tensor model, especially in its rank- version, has been recently receiving increasing attention due to its enhanced abilit…
Early soft and flexible fusion of EEG and fMRI via tensor decompositions
Christos Chatzichristos, Eleftherios Kofidis, Lieven De Lathauwer +2
Data fusion refers to the joint analysis of multiple datasets which provide complementary views of the same task. In this preprint, the problem of jointly analyzing electroencephal…
Block-Term Tensor Decomposition: Model Selection and Computation
Athanasios A. Rontogiannis, Eleftherios Kofidis, Paris V. Giampouras
The so-called block-term decomposition (BTD) tensor model has been recently receiving increasing attention due to its enhanced ability of representing systems and signals that are…
A Tensor-based Approach to Joint Channel Estimation / Data Detection in Flexible Multicarrier MIMO Systems
Eleftherios Kofidis
Filter bank-based multicarrier (FBMC) systems have attracted increasing attention recently in view of their many advantages over the classical cyclic prefix (CP)-based orthogonal f…
Assisted Dictionary Learning for fMRI Data Analysis
Manuel Morante Moreno, Yannis Kopsinis, Eleftherios Kofidis +2
Extracting information from functional magnetic resonance (fMRI) images has been a major area of research for more than two decades. The goal of this work is to present a new metho…
Joint Channel Estimation / Data Detection in MIMO-FBMC/OQAM Systems - A Tensor-Based Approach
Eleftherios Kofidis, Christos Chatzichristos, Andre L. F. de Almeida
Filter bank-based multicarrier (FBMC) systems are currently being considered as a prevalent candidate for replacing the long established cyclic prefix (CP)-based orthogonal frequen…
Higher-Order Block Term Decomposition for Spatially Folded fMRI Data
Christos Chatzichristos, Eleftherios Kofidis, Giannis Kopsinis +1
The growing use of neuroimaging technologies generates a massive amount of biomedical data that exhibit high dimensionality. Tensor-based analysis of brain imaging data has been pr…
A Unified Multicarrier Modulation Framework
Konstantinos Maliatsos, Eleftherios Kofidis, Athanasios Kanatas
Orthogonal frequency division multiplexing (OFDM) has been recently recognized as inadequate to meet the increased requirements of the next generation of communication systems. A n…
Blind Source Separation: Fundamentals and Recent Advances (A Tutorial Overview Presented at SBrT-2001)
Eleftherios Kofidis
Blind source separation (BSS), i.e., the decoupling of unknown signals that have been mixed in an unknown way, has been a topic of great interest in the signal processing community…
Preamble-based Channel Estimation in FBMC/OQAM Systems: A Time-Domain Approach
Eleftherios Kofidis
Filter bank-based multicarrier (FBMC) systems based on offset QAM (FBMC/OQAM) have recently attracted increased interest in several applications due to their enhanced flexibility,…
Preamble-based Channel Estimation in OFDM/OQAM Systems: A Review
E. Kofidis, D. Katselis, A. Rontogiannis +1
Filter bank-based multicarrier communications (FBMC) have recently attracted increased interest in both wired (e.g., xDSL, PLC) and wireless (e.g., cognitive radio) applications, d…
Preamble-Based Channel Estimation for CP-OFDM and OFDM/OQAM Systems: A Comparative Study
Dimitris Katselis, Eleftherios Kofidis, Athanasios Rontogiannis +1
In this paper, preamble-based least squares (LS) channel estimation in OFDM systems of the QAM and offset QAM (OQAM) types is considered, in both the frequency and the time domains…