Now showing items 1-12 of 5586

    • An UWB Tapered Slot Vivaldi Antenna (TSA) with improved characterestics 

      Akazzim, Youness; Kanjaa, Mohammed; El Mrabet, Otman; Jofre Roca, Lluís; Essaaidi, Mohamed (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference lecture
      Restricted access - publisher's policy
      In this paper, an UWB Tapered Slot Vivaldi Antenna (TSA) is presented. The proposed TSA is optimized in order to increase the bandwidth and ensure a good impedance matching at low and bandwidth frequencies while respecting ...
    • The flexible microwave payload -2: design, implementation, and optimization of a GNSS-R and radiometry processor for cubesat-based earth observation missions 

      Muñoz Martin, Joan Francesc; Fernandez Capon, Lara Pilar; Ruiz De Azúa Ortega, Juan Adrián; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Restricted access - publisher's policy
      The Flexible Microwave Payload 2 (FMPL-2) is a Remote Sensing payload carried on board 3 Cat-5/A, one of the two 6-unit CubeSats of the FSSCat mission. FMPL-2 is a payload based on a Software Defined Radio (SDR), integrating ...
    • Precise orbit observation techniques for geosynchronous synthetic aperture radar (GEOSAR) 

      Nicolás Álvarez, Jorge; Broquetas Ibars, Antoni; Aguasca Solé, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Restricted access - publisher's policy
      The orbit accuracy requirements for a Geosynchronous Synthetic Aperture Radar (GEOSAR) are studied. Compared to telecommunication GEO satellites' station keeping needs, focusing the GEOSAR synthetic aperture demands a more ...
    • Refining the methodology to correct the faraday rotation angle from SMOS measurements 

      Rubino, Roselena; Duffo Ubeda, Núria; González Gambau, Verónica; Corbella Sanahuja, Ignasi; Durán Martínez, Israel; Torres Torres, Francisco; Martín Neira, Manuel
      Conference report
      Restricted access - publisher's policy
      In this work, a refined methodology to correct the Faraday Rotation angle (FRA) for the SMOS mission is proposed. The method is based on calculating the FRA using the SMOS full-pol radiometric data to obtain VTEC maps ...
    • SDN-enabled reconfigurable optical data center network with automatic network slicing to provision dynamic QoS 

      Xue, Xuwei; Pan, Bitao; Agraz Bujan, Fernando; Pagès Cruz, Albert; Guo, Xiaotao; Yan, Fulong; Spadaro, Salvatore; Calabretta, Nicola (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Restricted access - publisher's policy
      An SDN-controlled optical DCN enabling automatic QoS-driven network-slice provisioning, reconfiguration and flow-priority updating is demonstrated for the first-time. Network-slice reconfigurations with guaranteed QoS based ...
    • Unsupervised learning for detection of mobility related anomalies in commercial LTE networks 

      Moysen, Jessica; Ahmed, Furqan; García Lozano, Mario; Niëmela, Jarno (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Restricted access - publisher's policy
      We propose an unsupervised learning based anomaly detection framework for identifying cells experiencing performance degradation due to mobility problems, in LTE networks. Handover failure rate is used as a performance ...
    • Polar electron content from GPS data-based global ionospheric maps: assessment, case studies, and climatology 

      Lyu, Haixia; Hernández Pajares, Manuel; Aragón Ángel, Maria Angeles; Monte Moreno, Enrique; An, Jiachun; Liu, Jingbin (2020-04-22)
      Article
      Open Access
      The electron content distribution of the north and south polar ionosphere from 2001 to the beginning of 2019 is analyzed by using the UQRG global ionospheric map (GIM) of vertical total electron content (VTEC), computed ...
    • Big data-driven automated anomaly detection and performance forecasting in mobile networks 

      Moysen Cortes, Jessica; Ahmed, Furqan; García Lozano, Mario; Niëmela, Jarno (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Restricted access - publisher's policy
      The massive amount of data available in operational mobile networks offers an invaluable opportunity for operators to detect and analyze possible anomalies and predict network performance. In particular, application of ...
    • Acceleration of Born series by change of variables 

      López Menchón, Héctor; Rius Casals, Juan Manuel; Heldring, Alexander; Úbeda Farré, Eduard (2021-02-26)
      Article
      Open Access
      In this work, we propose a method to enhance the convergence of the Born series. The Born series is widely used in scattering theory, but its convergence is only guaranteed under certain restrictive conditions which limit ...
    • Reversible self-replication of spatiotemporal Kerr cavity patterns 

      Benadouda Ivars, Salim; Kartashov, Yaroslav V.; Torner Sabata, Lluís; Conejero Casares, José Alberto; Milian Enrique, Carles (American Institute of Physics (AIP), 2021-02-12)
      Article
      Open Access
      We uncover a novel and robust phenomenon that causes the gradual self-replication of spatiotemporal Kerr cavity patterns in cylindrical microresonators. These patterns are inherently synchronized multifrequency combs. Under ...
    • Quantum-inspired Fredkin gate based on spatial modes of light 

      Urrego González, Daniel Fernando; López Mago, Dorilian; Vicuña Hernández, Verónica; Pérez Torres, Juan (2020-04-27)
      Article
      Open Access
      Insights gained from quantum physics can inspire novel classical technologies. These quantum-inspired technologies are protocols that aim at mimicking particular features of quantum algorithms. They are generally easier ...
    • Optical coherence tomography with a nonlinear interferometer in the high parametric gain regime 

      Jiménez Machado, Gerard; Frascella, Gaetano; Pérez Torres, Juan; Chekhova, Maria (2020-08-31)
      Article
      Open Access
      We demonstrate optical coherence tomography based on an SU(1,1) nonlinear interferometer with high-gain parametric down-conversion. For imaging and sensing applications, this scheme promises to outperform previous experiments ...