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Ara es mostren els items 1-20 de 66

    • A survey of 5G-based positioning for industry 4.0: state of the art and enhanced techniques 

      Muthineni, Karthik; Artemenko, Alexander; Vidal Manzano, José; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      The fifth generation (5G) mobile communication technology integrates communication, positioning, and mapping functionalities as an in-built feature. This has drawn significant attention from industries owing to the capability ...

    • Adaptive array beamforming for frequency hopping modulation 

      Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A. (1996)
      Text en actes de congrés
      Accés obert
      A new architecture for Array Processing using Frequency Hopping (FH) modulation is addressed in this paper which takes advantage of the knowledge of the frequency sequence at the receiver, requiring neither temporal nor ...

    • 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
      Accés obert
      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 ...

    • Assessment of direct positioning for IR-UWB in IEEE 802.15.4a channels 

      Navarro, Mònica; Closas, Pau; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper assesses the problem of localization in IR-UWB under realistic channel models for Direct Position Estimation (DPE) approaches. DPE schemes have been proposed for positioning and localization for well developed ...

    • Asymptotically optimal linear shrinkage of sample LMMSE and MVDR filters 

      Serra, Jordi; Nájar Martón, Montserrat (2014-07-15)
      Article
      Accés restringit per política de l'editorial
      Conventional implementations of the linearminimum mean-square (LMMSE) and minimum variance distortionless response (MVDR) estimators rely on the sample matrix inversion (SMI) technique, i.e., on the sample covariance matrix ...

    • Blind wideband source separation 

      Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A.; Bonet, I (1994)
      Text en actes de congrés
      Accés obert
      This paper deals with the general problem of separating two independent wideband sources when they are mixed by unknown filters. In order to solve this problem, a backward framework is proposed which is composed of two ...

    • Casting signal processing to reall-world data 

      Closas Gómez, Pau; Conti, Andrea; Dardari, Davide; Decarli, Nicoló; Falletti, Emanuela; Fernández Prades, Carlos; Gholami, Mohammad Reza; Nájar Martón, Montserrat; Lagunas Targarona, Eva; Pini, Marco; Rydström, Mats; Sottile, Francesco; Ström, Erik G. (Elsevier, 2011-10)
      Capítol de llibre
      Accés restringit per política de l'editorial
      This chapter presents the results of a testing and validation activity carried out to analyze the performance of signal-processing techniques related to positioning and navigation. The steps included the setup of a measurement ...

    • Compressed spectrum sensing in the presence of interference: comparison of sparse recovery strategies 

      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
      Existing approaches to Compressive Sensing (CS) of sparse spectrum has thus far assumed models contaminated with noise (either bounded noise or Gaussian with known power). In practical Cognitive Radio (CR) networks, primary ...

    • Compressive sensing for through wall radar imaging of stationary scenes using arbitrary data measurements 

      Lagunas Targarona, Eva; Amin, Moeness G.; Ahmad, Fauzia; Nájar Martón, Montserrat (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper, we deal with removal of wall EM reflections prior to image reconstruction using step-frequency radars. The goal is to enable behind-the-wall target detection and localization from reduced data measurements. ...

    • Compressive spectrum sensing based on spectral shape feature detection 

      Lagunas, Eva; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper, we address sparsity-based spectrum sensing for Cognitive Radio (CR) applications. Motivated by the sparsity described by the low spectral occupancy of the licensed radios, the proposed approach utilizes the ...

    • Conformador de haz de referencia por código de dos etapas: aplicación a la recepción de señales con modulación de saltos frecuenciales 

      Nájar Martón, Montserrat (Universitat Politècnica de Catalunya, 1996-10-25)
      Tesi
      Accés obert
      La tesis propone un nuevo conformador de haz para la recepción de señales con modulación de saltos frecuenciales "frequency hopping" (FH) basado en el conocimiento de la secuencia de frecuencias utilizada en la modulación ...

    • Cramer-rao bound for time-delay estimation in the frequency domain 

      Serra, Jordi; Blanco, Luis; Nájar Martón, Montserrat (European Association for Signal Processing (EURASIP), 2009)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper a measure of performance of time delay estimators arising from a frequency model of the received signal is presented. The aim is to derive theoretical analysis of the Cramer-Rao bound (CRB) for time delay ...

    • Determining building interior structures using compressive sensing 

      Lagunas Targarona, Eva; Amin, Moeness; Ahmad, Fauzia; Nájar Martón, Montserrat (2013-01-22)
      Article
      Accés obert
      We consider imaging of the building interior structures using Compressive Sensing (CS) with applications to through-the-wall imaging and urban sensing. We consider a monostatic synthetic aperture radar imaging system ...

    • Double shrinkage correction in sample LMMSE estimation 

      Serra, Jordi; Nájar Martón, Montserrat (European Association for Signal Processing (EURASIP), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The sample linear minimum mean square error (LMMSE) es- timator undergoes high performance degradation in the small sample size regime. Herein a double shrinkage correction is proposed to alleviate this problem. First, ...

    • Energy efficiency communications over the AWGN relay channel 

      Gómez Vilardebó, Jesús; Pérez Neira, Ana Isabel; Nájar Martón, Montserrat (2010)
      Article
      Accés restringit per política de l'editorial
      This paper addresses the energy efficiency analysis of the relay channel under additive white Gaussian noise. We consider the rate bounds given by decode and forward and the cut set bound and assume that resources are ...

    • Energy efficient communications over the AWGN relay channel 

      Gómez Vilardebó, Jesús; Pérez Neira, Ana Isabel; Nájar Martón, Montserrat (2010-01-08)
      Article
      Accés obert
      This paper addresses the energy efficiency analysis of the relay channel under additive white Gaussian noise. We consider the rate bounds given by decode and forward and the cut set bound and assume that resources are ...

    • Examen Final 

      Nájar Martón, Montserrat; Pascual Iserte, Antonio; Villares Piera, Nemesio Javier (Universitat Politècnica de Catalunya, 2023-06-01)
      Examen
      Accés restringit a la comunitat UPC

    • Examen Final 

      Nájar Martón, Montserrat; Pagès Zamora, Alba Maria; Riba Sagarra, Jaume (Universitat Politècnica de Catalunya, 2019-01-21)
      Examen
      Accés restringit a la comunitat UPC

    • Examen Final 

      Fernández Rubio, Juan Antonio; Nájar Martón, Montserrat; Pagès Zamora, Alba Maria (Universitat Politècnica de Catalunya, 2021-01-18)
      Examen
      Accés restringit a la comunitat UPC

    • Examen Final 

      Nájar Martón, Montserrat; Pagès Zamora, Alba Maria; Fernández Rubio, Juan Antonio (Universitat Politècnica de Catalunya, 2018-01-18)
      Examen
      Accés restringit a la comunitat UPC