Now showing items 1-16 of 16

  • 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
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    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
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    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
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    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 ...
  • Onboard beam generation for multibeam satellite systems 

    Joroughi, Vahid; Vazquez, Miguel Angel; Pérez Neira, Ana Isabel; Devillers, Bertrand (2017-06-01)
    Article
    Open Access
    This paper aims at designing an onboard beam generation process for a hybrid onboard on-ground multibeam satellite architecture. The proposed method offers a good tradeoff between total throughput and feeder link bandwidth ...
  • 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 ...