Exploració per autor "Nájar Martón, Montserrat"Més informacióMés informació

Ara es mostren els items 38-57 de 66

    • 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
      Accés obert
      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 ...

    • Source reference in CIR beamforming 

      Lagunas Hernandez, Miguel A.; Nájar Martón, Montserrat (1992-01)
      Article
      Accés restringit per política de l'editorial
      This paper presents a procedure for CIR beamforming that avoids SVD-like proceduresm and is derived from the classic CINR solution. The resulting nulls along the direction of the impinging interferers are of the same degree ...

    • Source separation based on coupled single DOA estimation processors 

      Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 1993)
      Text en actes de congrés
      Accés obert
      The separation of sources from an array of sensors is addressed. Based on Kolmogorov's theorem, an adaptive algorithm is proposed to separate simultaneously all the unknown impinging sources on an aperture of sensors. This ...

    • Space-time-frequency candidate methods for spectrum sensing 

      Lagunas Targarona, Eva; Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A. (2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The basic idea behind Cognitive Radio (CR) is to allow unlicensed users to utilize licensed frequency bands when they do not interfere to the primary (licensed) users. Thus, an important requirement of CR systems is to ...

    • Sparse correlation matching-based spectrum sensing for open spectrum communications 

      Lagunas Targarona, Eva; Nájar Martón, Montserrat (2012-02)
      Article
      Accés obert
      To deal with the current spectrum scarcity problem and exploiting the fact that exclusive access through tightly regulated licensing leads to idle spectrum, cognitive radio has been proposed as a way to reuse this ...

    • Sparse multiple relay selection for network beamforming with individual power constraints using semidefinite relaxation 

      Blanco, Luis; Nájar Martón, Montserrat (2016-02)
      Article
      Accés obert
      This paper deals with the multiple relay selection problem in two-hop wireless cooperative networks with individual power constraints at the relays. In particular, it addresses the problem of selecting the best subset of ...

    • Sparsity-based radar imaging of building structures 

      Lagunas, Eva; Amin, Moeness; Ahmad, Fauzia; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper, we address imaging of the interior structure of a building using a reduced number of measurements in through-the-wall imaging and urban sensing applications. Unlike majority of the feature detection methods ...