Exploració per autor "Mestre Pons, Francesc X."

Ara es mostren els items 1-15 de 15

    • Adaptive Beamforming for High Bit Rate Services in the FDD Mode of UTRA 

      Mestre Pons, Francesc X.; Nájar Martón, Montserrat; Antón Haro, Carles; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Text en actes de congrés
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      Most time-reference beamforming algorithms suffer from severe beampattern distortion effects when applied to high bit rate services in WCDMA, causing serious performance degradation in terms of output BER, especially at ...

    • Capacity of MIMO Channels: asymptotic evaluation under correlated fading 

      Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier; Pagès Zamora, Alba Maria (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-06-30)
      Article
      Accés obert
      This paper investigates the asymptotic uniform power allocation capacity of frequency nonselective multiple-input multiple-output channels with fading correlation at either the transmitter or the receiver. We consider ...

    • Characterization of the distortion of OFDM/OQAM modulations under frequency selective channels 

      Mestre Pons, Francesc X.; Sánchez Fernández, Matilde; Pascual Iserte, Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Filterbank based multicarrier modulations are well known to perform poorly in frequency selective channels when single tap carrier-by-carrier equalization is used. This degradation is cased by the inherent distortion ...

    • Joint beamforming and channel estimation for pilot-aided WCDMA systems 

      Mestre Pons, Francesc X.; Nájar Martón, Montserrat; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2000)
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      The problem of joint beamforming and channel estimation for multi-rate multi-code systems is addressed. Usual schemes perform this filtering/estimation operation making use of a training sequence time-multiplexed with the ...

    • ML approaches to channel estimation for pilot-aided multi-rate DS/CDMA systems 

      Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-03-31)
      Article
      Accés obert
      This paper analyzes the asymptotic performance of maximum likelihood (ML) channel estimation algorithms in wideband code division multiple access (WCDMA) scenarios. We concentrate on systems with periodic spreading sequences ...

    • Nonlinear system inversion applied to random variable generation 

      Pagès Zamora, Alba Maria; Lagunas Hernandez, Miguel A.; Mestre Pons, Francesc X. (Institute of Electrical and Electronics Engineers (IEEE), 2000)
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      A method to design random variable (RV) generators with the same probability density function (PDF) as a given RV record is presented. The resulting RV generator is a nonlinear system that when driven by a uniformly ...

    • Pilot-aided ML schemes for joint beamforming and channel estimation in WCDMA systems 

      Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2000)
      Text en actes de congrés
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      This paper proposes semi-blind channel estimation and interference cancellation schemes for the reception of pilot-aided signals in WCDMA systems. It is shown that the performance of classical training-based schemes is ...

    • Single input multiple output techniques for Hiperlan/ 2 

      Pérez Neira, Ana Isabel; Bartolomé Calvo, Diego; Mestre Pons, Francesc X. (2001)
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      In this paper, the use of adaptive antennas for Orthogonal Frequency Division Multiplexing (OFDM) is studied. More in concrete the paper is devoted to possible standard-jiendly techniques for Hiperlan/2 (HL/2). First, the ...

    • Smart antennas in software radio base stations 

      Pérez Neira, Ana Isabel; Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-02-28)
      Article
      Accés obert
      The application of adaptive antenna techniques to fixed-architecture base stations has been shown to offer wide-ranging benefits, including interference rejection capabilities or increased coverage and spectral ...

    • Software Radio para antenas inteligentes en comunicaciones personales multistandard 

      Vidal Manzano, José; Cabrera-Bean, Margarita; Fonollosa, Javier R; Lagunas Hernandez, Miguel A.; Mestre, Xavier; Mestre Pons, Francesc X.; Pérez Neira, Ana Isabel (Patrocinadores: Alcatel, Indra, Amper y otros, 1998)
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    • Spatial filtering for pilot-aided WCDMA systems: a semi-blind subspace approach 

      Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-10-31)
      Article
      Accés obert
      This paper proposes a spatial filtering technique for the reception of pilot-aided multirate multicode direct-sequence code division multiple access (DS/CDMA) systems such as wideband CDMA (WCDMA). These systems introduce ...

    • The IST METRA Project 

      Rodríguez Fonollosa, Javier; Heikkilä, Markku; Kermoal, Jean Philippe; Mestre Pons, Francesc X.; Pagès Zamora, Alba Maria; Pollard, Adam; Schumacher, Laurent; Ylitalo, Juha; Gaspa Maynou, Roger (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-07-31)
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      Accés obert
      This article summarizes the main achievements of the Multi-Element Transmit and Receive Antennas (METRA) Project, an IST research and technological development project carried out between January 2000 and June 2001 by ...

    • Two-stage code reference beamformer for the reception of frequency hopping modulated signals 

      Nájar Martón, Montserrat; Mestre Pons, Francesc X.; Lagunas Hernandez, Miguel A. (2000-12)
      Article
      Accés obert
      This paper presents a beamforming technique for the reception of frequency hopping (FH) modulated signals, which takes advantage of their inherent frequency diversity. This technique, based on a code reference beamformer, ...

    • Two-stage code reference beamformer in mobile communications 

      Mestre Pons, Francesc X.; Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A. (1998)
      Text en actes de congrés
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      This paper addresses a new architecture for blind adaptive beamforming when dealing with frequency hopping (FH) modulation in cellular mobile communications systems. The proposed code reference beamformer (CRB) takes ...

    • Uplink beamforming for the FDD mode of UTRA 

      Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Text en actes de congrés
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      This paper presents some link level simulation results for the evaluation of adaptive antennas in the uplink of the FDD mode of UTRA (UMTS terrestrial radio access). Two families of algorithms were initially considered, ...