Ara es mostren els items 87-106 de 111

    • Radio environmental maps: information models and reference model. Document number D4.1 

      Casadevall Palacio, Fernando José; Agustí Comes, Ramon; Pérez Romero, Jordi; López Benítez, Miguel; Grimoud, Sebastien; Sayrac, Berna; Dagres, Ioannis; Polydoros, Andreas; Riihijärvi, Janne; Nasreddine, Jad Nayef; Mähönen, Petri; Gavrilovska, Liljana; Atanasovski, Vladimir; van de Beek, Jaap (2011-04-30)
      Report de recerca
      Accés obert
      We describe herein the envisioned improvements of the REMs due to advanced sensing and processing. In relation to that, we also discuss the underlying modelling assumptions. Finally, we comment on how REMs can be of use ...
    • Radio-communications systems in indoor environments: performances of the channel equalization 

      Casadevall Palacio, Fernando José (. IEEE, 1991)
      Text en actes de congrés
      Accés obert
      The performance of the diversity and equalization techniques in an indoor radio environment is analyzed. Four and 16 QAM have been considered. Based on experimental results, it is concluded that a system without protection ...
    • Radioenlaces digitales de gran capacidad: comportamiento del lazo recuperador de portadora en presencia de desvanecimientos selectivos 

      Olmos Bonafé, Juan José; Agustí Comes, Ramon; Casadevall Palacio, Fernando José (Consejo Superior de Investigaciones Científicas (CSIC), 1986)
      Text en actes de congrés
      Accés obert
      It's a known fact that in high capacity digital radio links the main cause for outage is selective fading due to multipath propagation. In this paper we present the performance of a 16QAM system which includes a high quality ...
    • RAN slicing for multi-tenancy support in a WLAN scenario 

      Koutlia, Katerina; Umbert Juliana, Anna; García Escriche, Sergio; Casadevall Palacio, Fernando José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Radio Access Network (RAN) slicing is a key technology, based on Software Defined Networks (SDN) and Network Function Virtualization (NFV), which aims at providing a more efficient utilization of the available network ...
    • Rate adaptive resource allocation with fairness control for OFDMA networks 

      Bezerra Rodrigues, Emanuel; Casadevall Palacio, Fernando José (Deutsche Verlag-Anstalt, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The use of opportunistic radio resource allocation techniques in order to efficiently manage the resources generates a low fairness among the users in a cellular system due to uneven Quality of Service (QoS) distribution. ...
    • Reduced cluster search ML decoding for QO-STBC M-QAM MIMO systems 

      Abrao, Taufik; Suzuki, Isaque; Angelico, Bruno A.; Ciriaco, Fernando; Jeszensky, Paul Jean E.; Casadevall Palacio, Fernando José (2011)
      Article
      Accés restringit per política de l'editorial
      Since the maximum likelihood (ML) decoding for quasi-orthogonal space-time block codes (QO-STBC) with inner and outer codes multipleinputmultiple- output (MIMO) antenna systems results too complex when the modulation ...
    • REM-based real time testbed: a proof of concept on the benefits of using REM for improving radio resource management capabilities 

      Casadevall Palacio, Fernando José; Umbert Juliana, Anna (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The knowledge of the statistical characterization of the primary user activity can make more efficient the spectrum selection techniques, which are a key technology to improve the Cognitive Radio (CR) systems performance. ...
    • Signal uncertainty in spectrum sensing for cognitive radio 

      Lopez Benitez, Miguel; Casadevall Palacio, Fernando José (2013-05)
      Article
      Accés restringit per política de l'editorial
      The inability to perfectly know the system noise properties to infinite precision, referred to as noise uncertainty, results in noise power calibration errors that have been proven to impose fundamental limitations on the ...
    • Simulador de sistemas GPRS para Telefónica : guía de los modelos de tráfico 

      Umbert Juliana, Anna; Casadevall Palacio, Fernando José (2003-07)
      Report de recerca
      Accés restringit per acord de confidencialitat
    • Simulador de sistemas GPRS para Telefónica : manual de usuario 

      Umbert Juliana, Anna; Casadevall Palacio, Fernando José (2003-07)
      Report de recerca
      Accés restringit per acord de confidencialitat
    • Sistema de medida para caracterización estadística del canal móvil interior (indoor) 

      Barba, Xavier; Casadevall Palacio, Fernando José (1990)
      Text en actes de congrés
      Accés obert
    • Smart spectrum technologies for mobile information systems 

      López Benítez, Miguel; Lehtomaki, Janne; Umebayashi, Kenta; Casadevall Palacio, Fernando José (2016-07-31)
      Article
      Accés obert
    • Software radio reconfigurable hardware system (share) 

      Revés Ballesté, Xavier; Gelonch Bosch, Antonio José; Casadevall Palacio, Fernando José; Garcia, José L. (2000-08)
      Article
      Accés restringit per política de l'editorial
      Recent requirements and evolution of personal communications systems will tend to increase the number of applications that will run over the same hardware/software. While an option is providing this platform with all the ...
    • Space-dimension models of spectrum usage for cognitive radio networks 

      López Benítez, Miguel; Casadevall Palacio, Fernando José (2017-01-01)
      Article
      Accés obert
      The dynamic spectrum access (DSA) principle, relying on the cognitive radio (CR) paradigm, allows users to access spectrum over time intervals or spatial areas where it remains unused. Due to the opportunistic nature of ...
    • Spatial duty cycle model for cognitive radio 

      López Benítez, Miguel; Casadevall Palacio, Fernando José (2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Spectrum occupancy modeling in the context of Dynamic Spectrum Access/Cognitive Radio (DSA/CR) constitutes a rather unexplored research area that still requires much more effort. This paper addresses the problem of modeling ...
    • Spectrum occupancy in big cities - comparative study: measurement campaigns in Barcelona and Poznan 

      Kliks, Adrian; Kryszkiewicz, Pawel; Pérez Romero, Jordi; Umbert Juliana, Anna; Casadevall Palacio, Fernando José (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper a comparative study of two measurement campaigns carried out in Barcelona, Spain, and Pozna, Poland, to identify spectrum occupancy in different bands, is presented. In both cases the measurement setup ...
    • Spectrum occupancy in realistic scenarios and duty cycle model for cognitive radio 

      López Benítez, Miguel; Casadevall Palacio, Fernando José (2010-04)
      Article
      Accés obert
      Most of the spectrum occupancy measurement campaigns performed to the date in the context of cognitive radio are based on measurements in outdoor high points such as building roofs, balconies and towers. Although these ...
    • Spectrum usage in cognitive radio networks: from field measurements to empirical models 

      López Benítez, Miguel; Casadevall Palacio, Fernando José (2014-02)
      Article
      Accés restringit per política de l'editorial
      Cognitive Radio (CR) is aimed at increasing the e ffi ciency of spectrum utilization by allowing unlicensed users to access, in an op- portunistic and non-interfering manner, some licensed bands temporarily and / or ...
    • Spectrum usage models for the analysis, design and simulation of cognitive radio networks 

      López Benítez, Miguel; Casadevall Palacio, Fernando José (Springer, 2012-05-01)
      Capítol de llibre
      Accés restringit per política de l'editorial
      This chapter presents a comprehensive set of spectrum occupancy models specifically envisaged for the analysis, design and simulation of cognitive radio systems. The presented models have been proven to accurately capture ...
    • Statistical prediction of spectrum occupancy perception in dynamic spectrum access networks 

      Casadevall Palacio, Fernando José; López Benítez, Miguel (2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Cognitive radio nodes of a dynamic spectrum access network monitor the spectrum around them in order to detect and opportunistically exploit temporarily unoccupied spectrum gaps. The overall behavior of the whole network ...