Now showing items 1-15 of 15

    • Design of a hybrid ground/space architecture based on individual on-board feed power optimization for the forward link of a multi-beam broadband satellite system 

      Joroughi, Vahid; Vazquez, Miguel Angel; Devillers, Bertrand; Pérez Neira, Ana Isabel (American Institute of Aeronautics and Astronautics (AIAA), 2013)
      Conference report
      Restricted access - publisher's policy
      The multi-beam broadband satellite systems have been deployed to provide broadband services to their under-served geo-graphical area. In one hand, with assuming full frequency reuse among beams the resulting interference ...
    • Design of an hybrid ground-space architecture based on individual on-board antenna power optimization for the forward link of a multi-beam broadband satellite system 

      Joroughi, Vahid; Vazquez, Miguel Angel; Devillers, Bertrand; Pérez Neira, Ana Isabel (2013)
      Conference report
      Restricted access - publisher's policy
      The multi-beam broadband satellite systems have been deployed to provide broadband services to their under-served geo-graphical area. In one hand, with assuming full frequency reuse among beams the resulting interference ...
    • Design of an on-board beam generation process for the forward link of a multibeam broadband satellite system 

      Joroughi, Vahid; Devillers, Bertrand; Vazquez, Miguel Angel; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      The multi-beam broadband satellite systems have been deployed to provide broadband services to their under-served geo-graphical area. In one hand, with assuming full frequency reuse among beams the resulting interference ...
    • Design of pre-coding and combining in hybrid analog-digital massive MIMO with phase noise 

      Corvaja, Roberto; García Armada, Ana; Vazquez, Miguel Angel; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - confidentiality agreement
      The design of massive MIMO, especially at millimeter waves, requires a trade-off between cost and power consumption, balancing the complexity and the performance in terms of achievable rate. A recent trend in the design ...
    • Evaluation of wave loads on a new type of perforated caisson 

      Vazquez, Miguel Angel; Negro, Vicente; Lopez-Gutierrez, Jose Santos; Monso de Prat, José Luis (2016-09)
      Article
      Open Access
      A new type of perforated breakwater has been tested combining the advantages of cylindrical geometry with stepped wave energy dissipation. Thus, the new type of caisson implies a significant reduction of maximum wave forces, ...
    • Forward link interference mitigation in mobile interactive satellite systems 

      Henarejos Hernández, Pol; Vazquez, Miguel Angel; Cocco, Giuseppe; Pérez Neira, Ana Isabel (American Institute of Aeronautics and Astronautics (AIAA), 2013)
      Conference report
      Restricted access - publisher's policy
      We present the results of the performance evaluation of polarization-time coding and soft interference cancellation in multi-beam satellite systems a ected by co-channel interference in realistic setups. The standard of ...
    • Hybrid analog-digital transmit beamforming for spectrum sharing satellite-terrestrial systems 

      Vazquez, Miguel Angel; Blanco, Luis; Artiga Campos, Xavier; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference report
      Restricted access - publisher's policy
      This paper deals with the problem of hybrid analog-digital transmit beamforming under spectrum sharing constraints. Hybrid multiantenna architectures are ideal for high throughput wireless links, where full-digital solutions ...
    • Low-cost hybrid analog-digital beamformer evaluation in spectrum sharing systems 

      Vazquez, Miguel Angel; Artiga Campos, Xavier; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      This paper evaluates different analog-digital beam-forming solutions for future spectrum sharing mm-wave scenarios. In contrast to sub-6 GHz multiantenna schemes where all-digital solutions provide an excellent performance-cost ...
    • Multibeam joint precoding: frame-based design 

      Christopoulos, Dimitrios; Chatzinotas, Symeon; Taricco, Giorgio; Vazquez, Miguel Angel; Pérez Neira, Ana Isabel; Arapoglou, Pantelis-Daniel; Ginesi, Alberto (Academic Press, 2015-05-11)
      Part of book or chapter of book
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      Cooperative and Cognitive Satellite Systems provides a solid overview of the current research in the field of cooperative and cognitive satellite systems, helping users understand how to incorporate state-of-the-art ...
    • Multiple gateway precoding with per feed power constraints for multibeam satellite systems 

      Joroughi, Vahid; Vazquez, Miguel Angel; Pérez Neira, Ana Isabel (VDE Conference Publications, 2010)
      Conference report
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      Multibeam satellite systems have been recently studied in order to provide broadband services to their coverage area by employing fractional frequency reuse pattern. Towards a more spectrally efficient system, the designer ...
    • Multiuser downlink hybrid analog-digital beamforming with individual SINR constraints 

      Vazquez, Miguel Angel; Blanco, Luis; Pérez Neira, Ana Isabel (VDE-Verlag, 2011)
      Conference report
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      This paper deals with the problem of multiuser transmit hybrid analog-digital beamforming. Precisely, we tackle the problem of transmit power minimization under minimum signal-to-noise-plus-interference ratio (SINR) ...
    • Non-convex consensus ADMM for satellite precoder design 

      Vazquez, Miguel Angel; Konar, Aritra; Blanco, Luis; Sidiropoulos, Nicholas D.; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      Owing to the rapidly increasing traffic demands on satellite connectivity, the current exclusive frequency allocation is becoming obsolete. Instead, aggressive frequency reuse and interference mitigation techniques are ...
    • Precoding in multibeam satellite communications: present and future challenges 

      Vazquez, Miguel Angel; Pérez Neira, Ana Isabel; Christopoulos, Dimitrios; Chatzinotas, Symeon; Ottersten, Björn; Arapoglou, Pantelis-Daniel; Ginesi, Alberto; Tarocco, Giorgio (2016-12-01)
      Article
      Open Access
      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 ...
    • Precoding in multigateway multibeam satellite systems 

      Joroughi, Vahid; Vazquez, Miguel Angel; Pérez Neira, Ana Isabel (2016-07)
      Article
      Open Access
      This paper considers a multigateway multibeam satellite system with multiple feeds per beam. In these systems, each gateway serves a set of beams (cluster) so that the overall data traffic is generated at different ...
    • Scheduling and precoding in hybrid analog-digital multiantenna spectrum sharing systems 

      Vazquez, Miguel Angel; Pérez Neira, Ana Isabel; Corvaja, Roberto; García Armada, Ana; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      This paper investigates scheduling and precoding techniques via hybrid analog-digital transmitters in mm-wave frequency bands. As in spectrum sharing sub-6GHz scenarios, the presence of non-intended receivers limits the ...