Enviaments recents

  • Generalized multicast multibeam precoding for satellite communications 

    Joroughi, Vahid; Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel (2017-02-01)
    Article
    Accés obert
    This paper deals with the problem of precoding in multibeam satellite systems. In contrast to general multiuser multiple-input-multiple-output cellular schemes, multibeam satellite architectures suffer from different ...
  • SDN/NFV-enabled satellite communications networks: opportunities, scenarios and challenges 

    Ferrús Ferré, Ramón Antonio; Koumaras, Harilaos; Sallent Roig, José Oriol; Agapiou, George; Rasheed, Tinku; Boustie, Christelle; Gélard, Patrick; Ahmed, Toufik (Elsevier, 2016-03-01)
    Article
    Accés restringit per política de l'editorial
    In the context of next generation 5G networks, the satellite industry is clearly committed to revisit and revamp the role of satellite communications. As major drivers in the evolution of (terrestrial) fixed and mobile ...
  • Provisión de banda ancha móvil para seguridad pública y emergencias 

    Agustí Comes, Ramon; Sallent Roig, José Oriol; Ferrús Ferré, Ramón Antonio (2013-06-01)
    Article
    Accés obert
    El acceso de banda ancha móvil es fundamental para mejorar la eficiencia y efectividad de las comunicaciones de seguridad pública y emergencias. En este artículo se identifican y argumentan los tres pilares básicos sobre ...
  • Selection of correction candidates for the normalization of Spanish user generated content 

    Melero, Maite; Ruiz Costa-Jussà, Marta; Lambert, Patrik; Quixal, Martí (2016-01-01)
    Article
    Accés obert
    We present research aiming to build tools for the normalization of User-Generated Content (UGC). We argue that processing this type of text requires the revisiting of the initial steps of Natural Language Processing, since ...
  • On the trade-off between electrical power consumption and flight performance in fixed-wing UAV autopilots 

    Bertran Albertí, Eduardo; Sanchez Cerda, Alex (2016-11-01)
    Article
    Accés obert
    This paper sets out a study of the autopilot design for fixed wing Unmanned Aerial Vehicles (UAVs) taking into account the aircraft stability, as well as the power consumption as a function of the selected control strategy. ...
  • Enhancing satellite & terrestrial networks integration through NFV/SDN technologies 

    Ferrús Ferré, Ramón Antonio; Sallent Roig, José Oriol; Rasheed, Tinku; Morelli, Arianna; Koumaras, Harilaos; Agapiou, George; Boustie, Christelle; Gélard, Patrick; Mestari, Rachid; Makis, Haritos; Masson, Thierry (2015-07-01)
    Article
    Accés obert
    NFV and SDN technologies can become key facilitators for the combination of terrestrial and satellite networks. Enabling NFV into the SatCom domain will provide operators with appropriate tools and interfaces in order to ...
  • Alternativas de despliegue y asignación de espectro para las redes radio de emergencia de banda ancha 

    Cerrato, Javier Alonso; Ferrús Ferré, Ramón Antonio; Sallent Roig, José Oriol (2015-07-01)
    Article
    Accés obert
    La definición e implementación de una solución de banda ancha móvil que satisfaga las necesidades operativas de los cuerpos de seguridad pública y de emergencias (PPDR – Public Protection and Disaster Relief) es esencial ...
  • Precoding in multibeam satellite communications: present and future challenges 

    Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Christopoulos, Dimitrios; Chatzinotas, Symeon; Ottersten, Bjorn; Arapoglou, Pantelis-Daniel; Ginesi, Alberto; Tarocco, Giorgio (2016-12-01)
    Article
    Accés obert
    Whenever multibeam satellite systems target very aggressive frequency reuse in their coverage area, inter-beam interference becomes the major obstacle for increasing the overall system throughput. As a matter of fact, users ...
  • Ultrafast wavelength jumping and wavelength adjustment with low current using monolithically integrated FML for long-reach UDWDM-PON 

    Chu, Guang Yong; Prat Gomà, Josep Joan (2016-12-07)
    Article
    Accés obert
    Ultrafast wavelength jumping at optical network units (ONUs) for an access network with frequency modulated lasers (FMLs) is demonstrated. This FML consists of an intracavity tunable phase section and filtering gain section. ...
  • Assessment of the effect of the financial crisis on agents’ expectations through symbolic regression 

    Claveria, Oscar; Monte Moreno, Enrique; Torra Porras, Salvador (2016-12-16)
    Article
    Accés restringit per política de l'editorial
    Agents’ perceptions on the state of the economy can be affected during economic crises. Tendency surveys are the main source of agents’ expectations. The main objective of this study is to assess the impact of the 2008 ...

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