Exploració per tema "Time-frequency analysis"

Ara es mostren els items 9-17 de 17

    • Cooperative dual Leo satellite transmission in multi-user OTFS systems 

      Caus López, Màrius; Shaat, Musbah; Pérez Neira, Ana Isabel; Schellmann, Malte; Cao, Hanwen (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      This paper explores multi-satellite transmission schemes. The focus is on the multi-user downlink scenario, where two low Earth orbit satellites transmit data cooperatively, which are then combined at each of the ground ...

    • Degradation detection and severity estimation by exploiting an optical time and frequency digital twin 

      Devigili, Mariano; Ruiz Ramírez, Marc; Barzegar, Sima; Costa, Nelson; Napoli, Antonio; Pedro, João; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      We exploit the intrinsic advantages of a time and frequency domain digital twin to detect degradations and to estimate their severity. Noticeable performance shown for filter failures confirms the usefulness of this approach.

    • EMI model of an AC/AC power converter 

      Espina Masramon, Jorge; Balcells Sendra, Josep; Arias Pujol, Antoni; Ortega García, Carlos; Berbel Artal, Néstor (2010)
      Text en actes de congrés
      Accés obert
      This paper deals with the validation of an EMI model to predict electromagnetic interferences (EMI) produced by power converters. A direct AC to AC matrix converter (MC) has been selected as experimental setup for the ...

    • Low entropy map of brain oscillatory activity identifies spatially localized events: A new method for automated epilepsy focus prediction 

      Principe, Alessandro; Tauste Campo, Adrián Francisco; Vila Vidal, Manel; Rocamora, Rodrigo; Deco, Gustavo; Pérez Enríquez, Carmen (2020-03)
      Article
      Accés obert
      The spatial mapping of localized events in brain activity critically depends on the correct identification of the pattern signatures associated with those events. For instance, in the context of epilepsy research, a number ...

    • Positive time-frequency distributions based on joint marginal constraints 

      Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1996-08-01)
      Article
      Accés obert
      This correspondence studies the formulation of members of the Cohen-Posch class of positive time-frequency energy distributions. Minimization of cross-entropy measures with respect to different priors and the case of ...

    • Relationship between sleep stages and HRV response in obstructive sleep apnea patients 

      Romero Pérez, Daniel; Jané Campos, Raimon (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
      Accés obert
      Patients suffering from obstructive sleep apnea (OSA) usually present an increased sympathetic activity caused by the intermittent hypoxia effect on autonomic control. This study evaluated the relationship between sleep ...

    • Reliability oriented OTFS-based LEO satellites joint transmission scheme 

      Caus López, Màrius; Shaat, Musbah; Pérez Neira, Ana Isabel; Schellmann, Malte; Ca, Hanwen (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Text en actes de congrés
      Accés obert
      This paper investigates a dual satellite transmission scheme with coherent reception. The receiver has a single synchronization circuit and is locked to only one of the satellites. Beam-centric pre-compensation techniques ...

    • Sex differences in autonomic response to exercise testing in patients with Brugada syndrome 

      Calvo González, Mireia; Le Rolle, Virginie; Romero Pérez, Daniel; Béhar, Nathalie; Gomis Román, Pedro; Mabo, Philippe; Hernández, Alfredo I. (Springer, 2018-07-12)
      Capítol de llibre
      Accés restringit per política de l'editorial
      Ventricular arrhythmias in Brugada syndrome (BS) typically occur at rest and especially during sleep, suggesting that changes in the autonomic modulation may play an important role in arrhythmogenesis. The autonomic response ...

    • Wigner higher-order spectra: definition, properties, computation and application to transient signal analysis 

      Rodríguez Fonollosa, Javier; Nikias, Chrysostomos L. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-01-31)
      Article
      Accés obert
      The Wigner higher order moment spectra (WHOS) are defined as extensions of the Wigner-Ville distribution (WD) to higher order moment spectra domains. A general class of time-frequency higher order moment spectra is also ...