Enviaments recents

  • Impact of noisy annotators’ reliability in a crowdsourcing system performance 

    Cabrera Beán, Margarita Asuncion; Diaz Vilor, Carles; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Crowdsourcing is a powerful tool to harness citizen assessments in some complex decision tasks. When multiple annotators provide their individual labels a more reliable collective decision is obtained if the individual ...
  • Equalization of non-minimum phase channels with a non-linear architecture 

    Pagès Zamora, Alba Maria; Lagunas Hernandez, Miguel A. (1994)
    Text en actes de congrés
    Accés obert
    The equalization of non-minimum phase channels by means of a transversal filter becomes quite complicated when the real conditions are different from the ideal ones. The optimum delay that must be applied to the reference ...
  • Asymptotic MAP upper bounds for LDPC codes 

    Matas Navarro, David; Lamarca Orozco, M. Meritxell (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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    This paper aims at computing tight upper bounds for the maximum a posteriori threshold of low-density parity check codes in the asymptotic blocklength regime for the transmission over binary-input memoryless symmetricoutput ...
  • Optimum watermark detection in color images 

    Sayrol Clols, Elisa; Vidal Manzano, José; Cabanillas, Silvia; Santamaria, Sonia (Institute of Electrical and Electronics Engineers (IEEE), 1999)
    Text en actes de congrés
    Accés obert
    This work concentrates on the problem of watermarking embedding and optimum detection in color images through the use of spread spectrum techniques both in space (Direct Sequence Spread Spectrum or DSSS) and frequency ...
  • Uplink beamforming for the FDD mode of UTRA 

    Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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    Accés obert
    This paper presents some link level simulation results for the evaluation of adaptive antennas in the uplink of the FDD mode of UTRA (UMTS terrestrial radio access). Two families of algorithms were initially considered, ...
  • Blind channel equalization using weighted subspace methods 

    Ruiz Feliu, Rafael; Cabrera Beán, Margarita Asuncion (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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    Accés obert
    This paper addresses the problems of blind channel estimation and symbol detection with second order statistics methods from the received data. It can be shown that this problem is similar to direction of arrival (DOA) ...
  • Sphericity minimum description length: asymptotic performance under unknown noise variance 

    Font Segura, Josep; Riba Sagarra, Jaume; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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    This paper revisits the model order selection problem in the context of second-order spectrum sensing in cognitive radio. Taking advantage of the recent interest on the generalized likelihood ratio (GLR), the asymptotic ...
  • Distributed multivariate regression with unknown noise covariance in the presence of outliers: an MDL approach 

    López Valcarce, Roberto; Romero Gonzalez, Daniel; Sala Álvarez, José; Pagès Zamora, Alba Maria (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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    We consider the problem of estimating the coefficients in a multivariable linear model by means of a wireless sensor network which may be affected by anomalous measurements. The noise covariance matrices at the different ...
  • Distributed AOA-based source positioning in NLOS with sensor networks 

    Giménez Febrer, Pedro Juan; Pagès Zamora, Alba Maria; Silva Pereira, Silvana; López Valcarce, Roberto (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Comunicació de congrés
    Accés obert
    This paper focuses on the problem of positioning a source using angle-of-arrival measurements taken by a wireless sensor network in which some of the nodes experience non lineof-sight (LOS) propagation conditions. In ...
  • Analysis of LDPC code syndrome entropy based on subgraphs 

    Matas Navarro, David; Lamarca Orozco, M. Meritxell (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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    We propose a method to bound the syndrome entropy of linear block codes from their factor graph representation. It is specially suited for sparse graphs such as those of low density parity check codes. It is based on the ...

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