Now showing items 1-12 of 231

    • Asymmetrical clipping optical filter bank multi-carrier modulation scheme 

      Ibrahim Mohamed Badr, Asmaa; Prat Gomà, Josep Joan; Ismail, Tawfik (2021-05)
      Article
      Restricted access - publisher's policy
      Filter bank multi-carrier (FBMC) is considered a promising alternative to the Orthogonal Frequency Division Multiplexing (OFDM) scheme. It improves spectral efficiency by eliminating the need for cyclic prefix while ...
    • Machine learning assisted EDFA gain ripple modelling for accurate QoT estimation 

      Mahajan, Ankush; Christodoulopoulos, Konstantinos; Martínez Rivera, Ricardo Victor; Spadaro, Salvatore; Muñoz González, Raül (The Institution of Engineering and Technology, 2019)
      Conference report
      Open Access
      Wavelength dependent EDFA gain ripple has an impact on connection's OSNR performance. We propose a machine learning regression model to estimate the end to end gain ripple penalty and to increase QoT estimation accuracy.
    • Quality of transmission estimator retraining for dynamic optimization in optical networks 

      Mahajan, Ankush; Christodoulopoulos, Konstantinos; Martínez Rivera, Ricardo Victor; Muñoz González, Raül; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2021-04-01)
      Article
      Restricted access - publisher's policy
      Optical network optimization involves an algorithm and a physical layer model (PLM) to estimate the quality of transmission of connections while examining candidate optimization operations. In particular, the algorithm ...
    • Data plane elements for optical performance monitoring agnostic to the modulation format for disaggregated optical networks 

      Fàbrega Sánchez, Josep Maria; Locatelli, Fabiano; Nadal Reixats, Laia; Christodoulopoulos, Konstantinos; Svaluto Moreolo, Michela; Spadaro, Salvatore (2020)
      Conference report
      Open Access
      In this paper, data plane alternatives for optical performance monitoring are presented as enablers to address the key challenges in disaggregated optical networks. In fact, a key element of the disaggregated networks is ...
    • Spectral processing techniques for efficient monitoring in optical networks 

      Locatelli, Fabiano; Christodoulopoulos, Konstantinos; Svaluto Moreolo, Michela; Fàbrega Sánchez, Josep Maria; Nadal Reixats, Laia; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2021-07-01)
      Article
      Restricted access - publisher's policy
      Having ubiquitous optical monitors in dense wavelength-division multiplexing (DWDM) or flex-grid networks allows the estimation in real time of crucial parameters. Such monitoring would be even more important in disaggregated ...
    • Optical phase effects in reconfigurable microwave photonic filters with multiple wavelength input 

      Nuño Gómez, Daniel-Juan; Santos Blanco, M. Concepción (2021-11)
      Article
      Open Access
      Microwave photonic filters with a multiple wavelength input are analyzed. A comprehensive model assessing the impact of the phase characteristic of the optical stage is presented from which optimized design rules have been ...
    • Energy-efficient analog beamforming with short packets in millimeter-wave MIMO systems 

      Borràs Pino, Jordi; Molina Oliveras, Francesc; López Valcarce, Roberto; Sala Álvarez, José (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Open Access
      The energy-aware design of fully analog precoders and combiners is investigated in this paper. To that aim, we consider a millimeter-wave short-packet communication scenario where power consumption and hardware complexity ...
    • Gender bias in multilingual neural machine translation: The architecture matters 

      Ruiz Costa-Jussà, Marta; Escolano Peinado, Carlos; Basta, Christine Raouf Saad; Ferrando Monsonís, Javier; Batlle, Roser; Kharitonova, Ksenia (2020-12-24)
      External research report
      Open Access
      Multilingual Neural Machine Translation architectures mainly differ in the amount of sharing modules and parameters among languages. In this paper, and from an algorithmic perspective, we explore if the chosen architecture, ...
    • A novel RFI detection method for microwave radiometers using multilag correlators 

      Díez García, Raúl; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2021-02-10)
      Article
      Open Access
      Radio frequency interference (RFI) is an increasing problem in microwave radiometry, particularly for Earth observation, because the antennas are pointing toward the Earth. RFI has been observed at the L-band in European ...
    • Dataset reduction for neural network based digital predistorters under strong nonlinearities 

      López Bueno, David; Gilabert Pinal, Pere Lluís; Montoro López, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Conference report
      Open Access
      The artificial neural networks (ANN) are gaining momentum in the digital predistorters (DPD) thanks to their inherently good approximation capabilities. Under strong or complex power amplifier nonlinearities, the size of ...
    • Rate allocation in massive multiple access combining successive decoding with error control 

      Molina Oliveras, Francesc; Sala Álvarez, José (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Conference report
      Open Access
      The Gaussian multiple access channel under asymptotically many code-division-multiple-access users and successive interference cancellation (SIC) is investigated in this work. Users transmit n-symbol packets and select ...
    • On differential imaging using electromagnetic simulation for vehicular antenna signature analysis 

      Solano Pérez, José Antonio; Martinez Ingles, Maria Teresa; Molina García-Pardo, José María; Romeu Robert, Jordi; Jofre Roca, Lluís; Ballesteros Sánchez, Christian; Rodríguez Rodríguez, José Víctor; Mateo Aroca, Antonio; Guzmán Quirós, Raúl (Multidisciplinary Digital Publishing Institute (MDPI), 2021-05-30)
      Article
      Open Access
      The current trend in vehicles is to integrate a wide number of antennae and sensors operating at a variety of frequencies for sensing and communications. The integration of these antennae and sensors in the vehicle platform ...