Exploració per autor "Riba Sagarra, Jaume"Més informacióMés informació

Ara es mostren els items 62-77 de 77

    • Quadratic sphericity test for blind detection over time-varying frequency-selective fading channels 

      Font Segura, Josep; Riba Sagarra, Jaume; Villares Piera, Nemesio Javier; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Comunicació de congrés
      Accés obert
      This paper addresses the problem of blind detection of a wide-sense stationary (WSS) signal over fading channels. We propose a test statistic which is optimal from a correlation-matching perspective that shows invariance ...

    • 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

    • Regularized estimation of information via canonical correlation analysis on a finite-dimensional feature space 

      Cabrera Estanyol, Ferran de; Riba Sagarra, Jaume (2023-08)
      Article
      Accés obert
      This paper aims to estimate the information between two random phenomena by using consolidated second-order statistics tools. The squared-loss mutual information, a surrogate of the Shannon mutual information, is chosen ...

    • Robust beamforming for interference rejection in mobile communications 

      Riba Sagarra, Jaume; Goldberg, Jason; Vázquez Grau, Gregorio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997-01-01)
      Article
      Accés obert
      The problem of robust beamformer design for mobile communications applications in the presence of moving co-channel sources is addressed. A generalization of the optimum beamformer based on a statistical model accounting ...

    • Robust beamforming for interference rejection in mobile communications 

      Riba Sagarra, Jaume; Goldberg, J; Vázquez Grau, Gregorio (1996)
      Text en actes de congrés
      Accés obert
      The problem of robust beamformer design in the presence of moving sources is considered. A new technique based on a generalization of the constrained minimum variance beamformer is proposed. The method explicitly takes ...

    • Robust data detection in asynchronous DS-CDMA in the presence of timing uncertainty 

      Riba Sagarra, Jaume; Goldberg, J; Vázquez Grau, Gregorio (IEEE, 1996)
      Text en actes de congrés
      Accés obert
      The decorrelating and minimum mean squared error data detectors for direct sequence code division multiple access (DS-CDMA) communications systems are known to exhibit low vulnerability to the near-far problem. Nevertheless, ...

    • Robust estimation of the magnitude squared coherence based on Kernel signal processing 

      Cabrera Estanyol, Ferran de; Riba Sagarra, Jaume; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Comunicació de congrés
      Accés obert
      A new outlier-robust approach to estimate the magnitude squared coherence of a random vector sequence, a common task required in a variety of estimation and detection problems, is proposed. The proposed estimator is based ...

    • Sampling walls in signal detection of Bernoulli nonuniformly sampled signals 

      Font Segura, Josep; Vázquez Grau, Gregorio; Riba Sagarra, Jaume (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work, we show the existence of sampling walls in signal detection of nonuniformly sampling wideband signals in the presence of noise uncertainty. A sampling wall is the sampling rate below which the target error ...

    • Signal selective doa tracking for multiple moving targets 

      Riba Sagarra, Jaume; Goldberg, J; Vázquez Grau, Gregorio; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1996)
      Text en actes de congrés
      Accés obert
      A new algorithm for signal selective tracking of the directions-of-arrival (DOAs) of multiple moving targets with an array of passive sensors is presented. A new method based on the principles of maximum likelihood estimation ...

    • Single and multi-frequency wideband spectrum sensing with side-information 

      Font Segura, Josep; Vázquez Grau, Gregorio; Riba Sagarra, Jaume (2014-10-01)
      Article
      Accés obert
      This study addresses the optimal spectrum sensing detection based on the complete or partial side-information on the signal and noise statistics. The use of the generalised-likelihood ratio test (GLRT) involves maximum-likelihood ...

    • Sparse-aware approach for covariance conversion in FDD systems 

      López Molina, Carlos Alejandro; Riba Sagarra, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Text en actes de congrés
      Accés obert
      This paper proposes a practical way to solve the Uplink-Downlink Covariance Conversion (UDCC) problem in a Frequency Division Duplex (FDD) communication system. The UDCC problem consists in the estimation of the Downlink ...

    • 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)
      Text en actes de congrés
      Accés obert
      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 ...

    • Squared-loss mutual information via high-dimension coherence matrix estimation 

      Cabrera Estanyol, Ferran de; Riba Sagarra, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Comunicació de congrés
      Accés obert
      Squared-loss mutual information (SMI) is a surro- gate of Shannon mutual information that is more advantageous for estimation. On the other hand, the coherence matrix of a pair of random vectors, a power-normalized version ...

    • Tema 2: Tx Digital Canales AWGN 

      Cabrera-Bean, Margarita; Fernández Rubio, Juan Antonio; Riba Sagarra, Jaume (Universitat Politècnica de Catalunya, 2011)
      Problema, exercici
      Accés obert

    • Tema 5: Modulaciones avanzadas 

      Rodríguez Fonollosa, Javier; Cabrera-Bean, Margarita; Riba Sagarra, Jaume (Universitat Politècnica de Catalunya, 2011)
      Apunts
      Accés obert

    • Tema 5: Modulaciones avanzadas 

      Cabrera-Bean, Margarita; Fernández Rubio, Juan Antonio; Riba Sagarra, Jaume (Universitat Politècnica de Catalunya, 2008)
      Problema, exercici
      Accés obert