Now showing items 21-40 of 55

  • High resolution adaptive arrays based on random processing techniques: frequency hopping modulation 

    Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1995)
    Conference report
    Open Access
    A new architecture for adaptive arrays using frequency hopping modulation is addressed. The resolution of the array and the interference rejection increase substantially applying random processing to the carrier frequency ...
  • Innovative signal processing techniques for wireless positioning 

    Dardari, Davide; Di Dio, Mario; Emmanuele, Andrea; Fontanella, Diana; Gezici, Sinan; Gholami, Mohammad Reza; Kieffer, Michel; Lagunas Targarona, Eva; Louveaux, Jérôme; Mallat, Achraf; Nájar Martón, Montserrat; Navarro, Monica; Nicoli, Monica; Reggiani, Luca; Rydström, Mats; Ström, Erik G.; Vandendorpe, Luc; Zanier, Francesca (Elsevier, 2011-10)
    Part of book or chapter of book
    Restricted access - publisher's policy
  • 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)
    Conference report
    Open Access
    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)
    Conference report
    Open Access
    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
    Restricted access - publisher's policy
    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 (Universitat Politècnica de València, 1993)
    Conference report
    Open Access
  • 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)
    Conference report
    Open Access
  • Multi-TOA based position estimation for IR-UWB 

    Floriach, Genís; Nájar Martón, Montserrat; Navarro, Monica (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference lecture
    Restricted access - publisher's policy
    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)
    Conference report
    Restricted access - publisher's policy
    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
    Restricted access - publisher's policy
    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)
    Conference report
    Open Access
  • Performance of a filterBank multiCarrier (FBMC) physical layer in the WiMAX context 

    Ringset, Vidar; Rustad, Helge; Schaich, Frank; Vandermont, Jurgen; Nájar Martón, Montserrat (2010)
    Conference report
    Open Access
    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)
    Conference report
    Open Access
    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)
    Part of book or chapter of book
    Restricted access - publisher's policy
    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, J.; Henarejos Hernández, Pol; Grunenberger, Yan; Nájar Martón, Montserrat (2011)
    Conference lecture
    Open Access
    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
    Open Access
    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 ...
  • 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)
    Conference report
    Open Access
    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)
    Conference report
    Restricted access - publisher's policy
    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
    Restricted access - publisher's policy
    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)
    Part of book or chapter of book
    Restricted access - publisher's policy
    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 ...