Ara es mostren els items 41-60 de 77

    • Implementació en una FPGA d'un generador de senyals modulades M-QAM 

      Pulido Escruela, Enric (Universitat Politècnica de Catalunya, 2009-04-28)
      Projecte/Treball Final de Carrera
      Accés obert
    • Interleaved operation of three-level neutral point clamped converter legs and reduction of circulating currents under SHE-PWM 

      Capellá Frau, Gabriel José; Pou Félix, Josep; Konstantinou, Georgios (Institute of Electrical and Electronics Engineers (IEEE), 2016-06)
      Article
      Accés obert
      Interleaving of voltage-source converter (VSC) legs enables higher output currents per phase, effectively increasing the power rating without increasing semiconductor ratings. However, the interleaved operation results ...
    • Interleaved selective harmonic elimination PWM for single-phase rectifiers in traction applications 

      Konstantinou, Georgios; Agelidis, Vassilios; Pou Félix, Josep (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Interleaved four-quadrant, single-phase rectifiers are widely used in traction applications as part of an AC-DC-AC conversion system. This paper presents selective harmonic elimination pulse-width modulation (SHE-PWM) ...
    • Investigation on Nyquist Modulation and Multiplexing for Fiber-Optic Communications 

      Jubany Ticó, Marc (Universitat Politècnica de Catalunya, 2016-02)
      Treball Final de Grau
      Accés obert
      Nowadays, the society in which we live, the need to communicate increases every day; therefore, there is a need to improve both spectral efficiency and methods of transmitting data faster. This thesis analyses a new ...
    • Joint temporal-spatial reference beamforming: EIG beamforming 

      Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel; Vázquez, Miguel Ángel (2010)
      Text en actes de congrés
      Accés obert
      Traditional methods for beamforming can be grouped in two families, the time reference beamformer and the spatial reference beamforming. Nevertheless, the increasing demand on receivers for location systems and high bandwidth ...
    • LCD displays performance comparison by MTF measurement using the white noise stimulus method 

      Mitja, Carles; Escofet Soteras, Jaume (2011-01-24)
      Article
      Accés restringit per política de l'editorial
    • Localized IR communications with Thymio II 

      Soldevila Vilarrasa, Josep (Universitat Politècnica de Catalunya / École polytechnique fédérale de Lausanne, 2014-02-10)
      Projecte/Treball Final de Carrera
      Accés obert
      [ANGLÈS] The goal of this master project is to develop an IR communication protocol for the robot Thymio II in order to use the seven IR proximity sensors existing in the robot, used to detect obstacles around it) to ...
    • Modulador óptico cuasiestático en la banda del infrarrojo basado en la ritf 

      Ortega Redondo, Juan Antonio (Universitat Politècnica de Catalunya, 1997-12-19)
      Tesi
      Accés obert
      Esta tesis doctoral contribuye a la búsqueda de alternativas para la sustitución de la técnica clásica demodulación de la radiación infrarroja, basada en unarueda "chopper". Esta técnica de modulación óptica, seutiliza en ...
    • Modulation Format Conversion in Future Optical Networks 

      Cano Adalid, Javier (Universitat Politècnica de Catalunya, 2009-03)
      Projecte/Treball Final de Carrera
      Accés obert
      The signal generation and receiver schemes of different modulation formats such as on off keying (OOK) in either non‐return to zero (NRZ) or return to zero (RZ), correlative coding and phase‐shift keying (PSK) are described ...
    • On improving phase-shifted PWM for flying capacitor multilevel converters 

      Ghias, Amer M.Y.M.; Pou Félix, Josep; Capellá Frau, Gabriel José; Acuna, Pablo; Agelidis, Vassilios (2016-08-01)
      Article
      Accés restringit per política de l'editorial
      This letter proposes a phase-shifted pulse-width modulation (PS-PWM) technique for the flying capacitor (FC) multilevel converter that improves the quality of the line-to-line voltages. In traditional PS-PWM, the line-to-line ...
    • Optimal current reference calculation for MMCs considering converter limitations 

      Westerman Spier, Daniel; Prieto-Araujo, E.; López Mestre, Joaquim; Gomis Bellmunt, Oriol (Institute of Electrical and Electronics Engineers (IEEE), 2020-08-31)
      Article
      Accés obert
      The paper addresses an optimization-based reference calculation method for Modular Multilevel Converters (MMC) operating in normal and constrained situations (when the converter needs to prioritize its quantities as it has ...
    • Optimal pilot design and power control in correlated MISO links 

      Pastore, Adriano; Rodríguez Fonollosa, Javier (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We study the maximization of an achievable ergodic rate expression of a multiple-input single-output (MISO) channel where both ends are cognizant of the same erroneous estimate of the current fading state, yet they have ...
    • Parallel-connected legs in a grid-tied inverter system for distributed generation 

      Capellá Frau, Gabriel José; Pou Félix, Josep; Zaragoza Bertomeu, Jordi; Ceballos Recio, Salvador; Gabiola, Igor; Robles Sestafe, Eider (2011)
      Comunicació de congrés
      Accés obert
      Grid-connected high-power inverters are often used in distributed generation and power quality systems. Those inverters have to handle high currents in order to achieve high power values without resorting to higher ...
    • Performance evaluation of a five-level flying capacitor converter with reduced DC bus capacitance under two different modulation schemes 

      Ghias, Amer M.Y.M.; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages ...
    • Phase contrast and operation regimes in multifrequency atomic force microscopy 

      Santos Hernández, Sergio (2014-04-07)
      Article
      Accés obert
      In amplitude modulation atomic force microscopy the attractive and the repulsive force regimes induce phase shifts above and below 90°, respectively. In the more recent multifrequency approach, however, multiple operation ...
    • Physical Layer Design for Wireless Galvanic Coupled Body Sensors 

      Pujol Roig, Joan Sebastià (Universitat Politècnica de Catalunya, 2014-12-07)
      Projecte/Treball Final de Carrera
      Accés obert
      Realitzat a/amb:   Northeastern University
      [ANGLÈS] Rapid advances in miniaturization and automated health control point to the widespread use of implanted micro-scale sensors in the near future, which will measure physiological conditions and report back data ...
    • Probing power laws in multifrequency AFM 

      Santos, Sergio; Gadelrab, Karim Raafat; Olukan, Tuza; Font Teixidó, Josep; Barcons Xixons, Víctor; Chiesa, Matteo (2023-02-17)
      Article
      Accés obert
      Quantification of conservative forces in multifrequency atomic force microscopy requires solving the general equations of the theory expressed in terms of the virials of interaction. Power law expressions are commonly ...
    • Pulsewidth modulations for the comprehensive capacitor voltage balance of diode-clamped multilevel converters 

      Busquets Monge, Sergio; Alepuz Menéndez, Salvador; Rocabert Delgado, Joan; Bordonau Farrerons, José (2009)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      In the previous literature, the introduction of the virtual space vector concept for the three-level three-leg neutral-point-clamped converter has led to the definition of pulsewidth modulation (PWM) strategies guaranteeing ...
    • PWM algorithm with adaptive offset for three-level multi-phase neutral-point-clamped converters 

      López, Iraide; Ceballos Recio, Salvador; Andreu, Jon; Kortabarria, Iñigo; Pou Félix, Josep (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper proposes a PWM based modulation strategy particularly useful for three-level multi-phase Neutral-Point-Clamped Converters. It achieves similar results to those obtained with the space vector modulation but ...
    • Rail-to-Rail Timer-Based Demodulator for AM Sensor Signals 

      Reverter Cubarsí, Ferran (2019-01-01)
      Article
      Accés obert
      This paper proposes a novel timer-based demodulator for low-frequency amplitude-modulated (AM) sensor signals with a rail-to-rail operating range. The demodulator extracts the amplitude of the AM signal by measuring the ...