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- Guido, Rodrigo Capobianco (author), Adali, Tulay (author), Bjornson, Emil (author), Blanc-Feraud, Laure (author), Braga-Neto, Ulisses (author), Ghoraani, Behnaz (author), Jutten, Christian (author), van der Veen, A.J. (author), Zhao, Hong Vicky (author), Zhu, Xiaoxing (author) contribution to periodical 2023
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- Guido, Rodrigo Capobianco (author), Adali, Tulay (author), Bjornson, Emil (author), Blanc-Feraud, Laure (author), Braga-Neto, Ulisses (author), Ghoraani, Behnaz (author), Jutten, Christian (author), van der Veen, A.J. (author), Zhao, Hong Vicky (author), Zhu, Xiaoxing (author) contribution to periodical 2023
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de Groot, N.M.S. (author), Shah, Dipen (author), Boyle, Patrick M. (author), Anter, Elad (author), Clifford, Gari D. (author), Deisenhofer, Isabel (author), van Dessel, Pascal (author), Dilaveris, Polychronis (author), van der Veen, A.J. (author)We aim to provide a critical appraisal of basic concepts underlying signal recording and processing technologies applied for (i) atrial fibrillation (AF) mapping to unravel AF mechanisms and/or identifying target sites for AF therapy and (ii) AF detection, to optimize usage of technologies, stimulate research aimed at closing knowledge gaps,...journal article 2022
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Moghaddasi, Hanie (author), Hunyadi, Borbala (author), van der Veen, A.J. (author), de Groot, N.M.S. (author), Hendriks, R.C. (author)Atrial Fibrillation (AF) is the most sustained arrhythmia in the heart. On the surface electrocardiogram (ECG), AF is characterised by the irregular RR intervals and by fibrillatory waves or the absence of a P wave. Since AF is a progressive disease, timely and correct detection is crucial for AF treatment. Detailed insight into the areas of...conference paper 2022
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Moghaddasi, Hanie (author), Hendriks, R.C. (author), van der Veen, A.J. (author), de Groot, N.M.S. (author), Hunyadi, Borbala (author)Atrial fibrillation (AF) is the most sustained arrhythmia in the heart and also the most common complication developed after cardiac surgery. Due to its progressive nature, timely detection of AF is important. Currently, physicians use a surface electrocardiogram (ECG) for AF diagnosis. However, when the patient develops AF, its various...journal article 2022
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Kazaz, T. (author), Janssen, G.J.M. (author), Romme, J.P.A. (author), van der Veen, A.J. (author)In wireless networks, an essential step for precise range-based localization is the high-resolution estimation of multipath channel delays. The resolution of traditional delay estimation algorithms is inversely proportional to the bandwidth of the training signals used for channel probing. Considering that typical training signals have...journal article 2022
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Mercuri, Marco (author), Lu, Yiting (author), Polito, Salvatore (author), Wieringa, Fokko (author), van der Veen, A.J. (author), Van Hoof, Chris (author), Torfs, Tom (author)Objective: Over the last two decades, radar-based contactless monitoring of vital signs (heartbeat and respiration rate) has raised increasing interest as an emerging and added value to health care. However, until now, the flaws caused by indoor multipath propagation formed a fundamental hurdle for the adoption of such technology in practical...journal article 2021
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Kazaz, T. (author), Romme, J.P.A. (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)The presence of rich scattering in indoor and urban radio propagation scenarios may cause a high arrival density of multipath components (MPCs). Often the MPCs arrive in clusters at the receiver, where MPCs within one cluster have similar angles and delays. The MPCs arriving within a single cluster are typically unresolvable in the delay domain....conference paper 2021
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Moghaddasi, Hanie (author), van der Veen, A.J. (author), de Groot, N.M.S. (author), Hunyadi, Borbala (author)Atrial fibrillation (AF) is the most common arrhythmia in the heart. Two main types of AF are defined as paroxysmal and persistent. In this paper, we present a method to discriminate between the characteristics of paroxysmal and persistent using tensor decompositions of a multi-channel electrocardiogram (ECG) signal. For this purpose, ECG...conference paper 2020
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van der Veen, A.J. (author), Romme, J.P.A. (author), Cui, Ye (author)In Principal Component Analysis (PCA), the dimension of the signal subspace is detected by counting the number of eigenvalues of a covariance matrix that are above a threshold. Random matrix theory provides accurate estimates for this threshold if the underlying data matrix has independent identically distributed columns. However, in time series...conference paper 2020
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Kazaz, T. (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)The multipath radio channel is considered to have a non-bandlimited channel impulse response. Therefore, it is challenging to achieve high resolution time-delay (TD) estimation of multipath components (MPCs) from bandlimited observations of communication signals. It this paper, we consider the problem of multiband channel sampling and TD...conference paper 2020
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Bermudez, Jose C.M. (author), Bugallo, Monica F. (author), van der Veen, A.J. (author)Reports on the activities of the Signal Processing Theory and Methods Technical Committee.journal article 2020
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Kazaz, T. (author), Coutino, Mario (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)In this paper, we focus on the problem of blind joint calibration of multiband transceivers and time-delay (TD) estimation of multipath channels. We show that this problem can be formulated as a particular case of covariance matching. Although this problem is severely ill-posed, prior information about radio-frequency chain distortions and...conference paper 2020
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Bentum, M. J. (author), Verma, M. K. (author), Rajan, R.T. (author), Boonstra, A. J. (author), Verhoeven, C.J.M. (author), Gill, E.K.A. (author), van der Veen, A.J. (author), Falcke, H. (author), Gurvits, L. (author)The past two decades have witnessed a renewed interest in low frequency radio astronomy, with a particular focus on frequencies above 30 MHz e.g., LOFAR (LOw Frequency ARray) in the Netherlands and its European extension ILT, the International LOFAR Telescope. However, at frequencies below 30 MHz, Earth-based observations are limited due to a...journal article 2020
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Abdi, Bahareh (author), Hendriks, R.C. (author), van der Veen, A.J. (author), de Groot, N.M.S. (author)Background: Local activation time (LAT) annotation in unipolar electrograms is complicated by interference from nonlocal atrial activities of neighboring tissue. This happens due to the spatial blurring that is inherent to electrogram recordings. In this study, we aim to exploit multi-electrode electrogram recordings to amplify the local...journal article 2020
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Rajan, R.T. (author), Leus, G.J.T. (author), van der Veen, A.J. (author)The estimation of the coordinates of nodes their proximity (or distance) measurements, is a principal challenge in numerous fields. Conventionally, when localizing a static network of immobile nodes, non-linear dimensionality reduction techniques are applied on the measured distances to obtain the relative coordinates up to a rotation and...journal article 2019
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Abdi, Bahareh (author), van der Veen, A.J. (author), de Groot, N.M.S. (author), Hendriks, R.C. (author)In this study, we propose a novel approach for estimation of local activation times (LATs) in fractionated electrograms. Using an electrophysiological tissue model, we first formulate the electrogram array as a convolution of transmembrane currents with a distance kernel. These currents are more local activities and less affected by the...conference paper 2019
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Abdi, Bahareh (author), Hendriks, R.C. (author), van der Veen, A.J. (author), de Groot, Natasja M.S. (author)Finding the hidden parameters of the cardiac electrophysiological model would help to gain more insight on the mechanisms underlying atrial fibrillation, and subsequently, facilitate the diagnosis and treatment of the disease in later stages. In this work, we aim to estimate tissue conductivity from recorded electrograms as an indication of...journal article 2019
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Abdi, Bahareh (author), Hendriks, R.C. (author), van der Veen, A.J. (author), de Groot, N.M.S. (author)Diagnosis and treatment of atrial fibrillation can benefit from various signal processing approaches employed on atrial electrograms. However, the performance and interpretation of these approaches get highly degraded by far-field ventricular activities (VAs) that distort the morphology of the pure atrial activities (AAs). In this study, we...conference paper 2019
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Kazaz, T. (author), Coutino, Mario (author), Janssen, G.J.M. (author), Leus, G.J.T. (author), van der Veen, A.J. (author)Synchronization and ranging in internet of things (IoT) networks are challenging due to the narrowband nature of signals used for communication between IoT nodes. Recently, several estimators for range estimation using phase difference of arrival (PDoA) measurements of narrowband signals have been proposed. However, these estimators are based...conference paper 2019