Now showing items 41-55 of 55

  • Simultaneous DOA estimation based on Kolmogorov's theorem 

    Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1993)
    Conference report
    Open Access
    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
    Restricted access - publisher's policy
    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)
    Conference report
    Open Access
    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)
    Conference lecture
    Restricted access - publisher's policy
    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
    Open Access
    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
    Open Access
    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)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • Spatial sparsity based direct positioning for IR-UWB in IEEE 802.15.4a channels 

    Lagunas Targarona, Eva; Navarro, Mònica; Closas Gómez, Pau; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Restricted access - publisher's policy
    In this paper, we focus on the application of Compressive Sensing (CS) techniques to Impulse Radio (IR) Ultra-WideBand (UWB) positioning systems under indoor propagation environments. Direct Position Estimation (DPE) ...
  • Spectral feature detection with Sub-Nyquist sampling for wideband spectrum sensing 

    Lagunas Targarona, Eva; Nájar Martón, Montserrat (2015-07-01)
    Article
    Open Access
    Compressive sensing (CS) has been successfully applied to alleviate the sampling bottleneck in wideband spectrum sensing leveraging the sparsity described by the low spectral occupancy of the licensed radios. However, the ...
  • Subset relay selection in wireless cooperative networks using sparsity-inducing norms 

    Blanco, Luis; Nájar Martón, Montserrat (2014)
    Conference report
    Restricted access - publisher's policy
    This paper addresses the problem of multiple relay selection in a two-hop wireless cooperative network. In particular, the proposed technique selects the best subset of relays, in a distributed beamforming scheme, which ...
  • The K-filter: a new architecture to model and design non-linear systems from Kolmogorov's theorem 

    Pagès Zamora, Alba Maria; Lagunas Hernandez, Miguel A.; Nájar Martón, Montserrat; Pérez Neira, Ana Isabel (1995-07)
    Article
    Open Access
    A new architecture to model and design nonlinear transfer functions is presented using a new formulation for nonlinear systems. This approach follows the guidelines of the mapping theorem due to A. Kolmogorov and it is ...
  • TOA Estimation in UWB: Comparison between time and frequency domain processing 

    Lagunas Targarona, Eva; Taponecco, Lorenzo; Nájar Martón, Montserrat; D'Amico, Antonio (2010)
    Conference report
    Open Access
    A comparison between time and frequency domain TOA estimators compliant with the 802.15.4a Standard has been made. The time domain estimator is done in two stages. One has the goal of identify the rst pulse in each symbol ...
  • 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
    Open Access
    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)
    Conference report
    Open Access
    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 ...
  • Wall mitigation techniques for indoor sensing within the compressive sensing framework 

    Lagunas Targarona, Eva; Amin, Moeness G.; Ahmad, Fauzia; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    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. However, the research work in this area thus ...