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Ara es mostren els items 32-51 de 66

    • 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)
      Text en actes de congrés
      Accés obert
      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 ...

    • Joint TOA and DOA estimation compliant with IEEE 802.15.4a standard 

      Lagunas Targarona, Eva; Nájar Martón, Montserrat; Navarro, Monica (2010)
      Text en actes de congrés
      Accés obert
      Ultra-WideBand (UWB) technology offers the potential of achieving high ranging accuracy through signal Time-Of-Arrival (TOA) measurements, even in harsh enviroments due to its ability to resolve multipath and penetrate ...

    • Joint wall mitigation and compressive sensing for indoor image reconstruction 

      Lagunas Targarona, Eva; Amin, Moeness; Ahmad, Fauzia; Nájar Martón, Montserrat (IEEE Press. Institute of Electrical and Electronics Engineers, 2012)
      Article
      Accés restringit per política de l'editorial
      Compressive sensing (CS) for urban operations and through-the-wall radar imaging has been shown to be successful in fast data acquisition and moving target localizations. The research in this area thus far has assumed ...

    • Muestreo aleatorio en frecuencia aplicado a la identificación de sistemas no lineales 

      Pagès Zamora, Alba Maria; Nájar Martón, Montserrat; Pérez Neira, Ana Isabel (Universidad de Valencia, 1994)
      Text en actes de congrés
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    • Muestreo aleatorio en frecuencia aplicado a la identificación de sistemas no lineales 

      Pagès Zamora, Alba Maria; Nájar Martón, Montserrat; Pérez Neira, Ana Isabel (Universitat Politècnica de València, 1993)
      Text en actes de congrés
      Accés obert

    • Multi-TOA based position estimation for IR-UWB 

      Floriach, Genís; Nájar Martón, Montserrat; Navarro, Monica (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The problem of localizing an IR-UWB transmitter from the signals received at several anchors is considered. The positioning problem is typically solved in a two-step approach where in the first step the Time of Arrival ...

    • Optimal linear correction in LMMSE estimation using moments of the complex inverse Wishart distribution 

      Serra, Jordi; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The conventional linear minimum mean square error esti- mator (LMMSE) suffers a severe performance degradation whenever the sample size is comparable to the observation dimension. In order to tackle this problem, we ...

    • Pattern matching for building feature extraction 

      Lagunas Targarona, Eva; Amin, Moeness G.; Ahmad, Fauzia; Nájar Martón, Montserrat (2014-12-01)
      Article
      Accés restringit per política de l'editorial
      We address the problem of detecting building dominant scatterers using a reduced number of measurements with applications to through-the-wall radar (TWR) and urban sensing. We consider oblique illumination, which specially ...

    • Performance comparison between FBMC and OFDM in MIMO systems under channel uncertainty 

      Payaró Llisterri, Miquel; Pascual Iserte, Antonio; Nájar Martón, Montserrat (2010)
      Text en actes de congrés
      Accés obert

    • Performance of a filterBank multiCarrier (FBMC) physical layer in the WiMAX context 

      Ringset, Vidar; Rustad, Helge; Schaich, Frank; Vandermont, Jurgen; Nájar Martón, Montserrat (2010)
      Text en actes de congrés
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      This paper describes some of the outcome of the FP7 project PHYDYAS, whose main objective was to propose a new physical layer that will enable introduction of cognitive radios and dynamic access spectrum management. ...

    • Pointing correction in an adaptive array for communications 

      Lagunas Hernandez, Miguel A.; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 1991)
      Text en actes de congrés
      Accés obert
      The authors discuss DSP procedures for pointing correction in adaptive arrays which uses a spatial reference to form the optimum beam (generalized sidelobe canceller, GSLC). The problem of adequate pointing arises from ...

    • Position estimation for IR-UWB systems: DPE, Multi-TOA approach, and their compressive sensing-based modeling 

      Lagunas, Eva; Navarro, Monica; Closas, Pau; Nájar Martón, Montserrat; Garcia-Gutierrez, Ricardo; Floriach, Genís (2018-01-01)
      Capítol de llibre
      Accés restringit per política de l'editorial
      The limitations of satellites create a large gap in assistive directional technologies, especially indoors. The methods and advances in alternate directional technologies is allowing for new systems to fill the gaps caused ...

    • Prototyping with SDR: a quick way to play with next-gen communications systems 

      Baranda Hortigüela, Jorge; Henarejos Hernández, Pol; Grunenberger, Yan; Nájar Martón, Montserrat (2011)
      Comunicació de congrés
      Accés obert
      Abstract—In this paper we present our approach regarding the implementation of new wireless radio receiver exploiting filterbank techniques, using a software-development driven approach. Since most of the common radio ...

    • Radio context awareness and applications 

      Reggiani, Luca; Fiorina, Jocelyn; Gezici, Sinan; Morosi, Simone; Nájar Martón, Montserrat (2013)
      Article
      Accés obert
      The context refers to “any information that can be used to characterize the situation of an entity, where an entity can be a person, place, or physical object.” Radio context awareness is defined as the ability of detecting ...

    • REAVALUACIÓ 

      Nájar Martón, Montserrat; Pagès Zamora, Alba Maria; Riba Sagarra, Jaume; Vázquez Grau, Gregorio (Universitat Politècnica de Catalunya, 2022-07-05)
      Examen
      Accés restringit a la comunitat UPC

    • Relay subset selection in cognitive networks with imperfect CSI and individual power constraints 

      Nájar Martón, Montserrat; Blanco, Luis (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés obert
      This paper considers the relay subset selection problem in an underlay cognitive network in which two secondary users communicate assisted by a set of N potential relays. More specifically, this paper deals with the joint ...

    • Robust primary user identification using compressive sampling for cognitive radios 

      Lagunas Targarona, Eva; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In cognitive radio (CR), the problem of limited spectral resources is solved by enabling unlicensed systems to opportunistically utilize the unused licensed bands. Compressive Sensing (CS) has been successfully applied to ...

    • Self-reference spatial diversity processing for spread spectrum communications 

      Pérez Palomar, Daniel; Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A. (2000-09)
      Article
      Accés restringit per política de l'editorial
      n this paper, the application of three blind (or selfreference) spatial diversity signal processing methods to Spread Spectrum (SS) communications is described. These methods do not require any kind of side information ...

    • Signal processing for hybridization 

      Caceres Duran, Mauricio A.; Closas Gómez, Pau; Falletti, Emanuela; Fernández Prades, Carlos; Nájar Martón, Montserrat; Sottile, Francesco (Elsevier, 2011-10)
      Capítol de llibre
      Accés restringit per política de l'editorial
      This chapter presents several signal processing strategies to combine together, in a seamless estimation process, position-related measurements coming from different technologies and/or systems (e.g., TOA and TDOA measurements ...

    • Simultaneous DOA estimation based on Kolmogorov's theorem 

      Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1993)
      Text en actes de congrés
      Accés obert
      The design of a new architecture for signal processing, based on the Kolmogorov's theorem (1957), is addressed. This architecture is applied to solve the problem of source separation. Particularly, an adaptive algorithm ...