Exploració per autor "Riba Sagarra, Jaume"
Ara es mostren els items 49-68 de 77
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Minimum error entropy estimation under contaminated Gaussian noise
López Molina, Carlos Alejandro; Cabrera Estanyol, Ferran de; Riba Sagarra, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2023-10-12)
Article
Accés obertIt is shown that Rényi's entropy of a Gaussian mixture with entropic index α∈(1,∞] is upper-bounded by the cluster with minimum variance. This basic idea leads to a clean worst-case formulation of the minimum error entropy ... -
Multi-frequency GLRT spectrum sensing for wideband cognitive radio
Font Segura, Josep; Vázquez Grau, Gregorio; Riba Sagarra, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
Text en actes de congrés
Accés restringit per política de l'editorialThe problem of spectrum sensing in multi-frequency cognitive radio systems is addressed. We show that as the sensed bandwidth increases, the primary user detection is governed by a low signal-to-noise ratio (low-SNR) regime. ... -
Multi-satellite cycle-slip detection and exclusion using the noise subspace of residual dynamics
Riba Sagarra, Jaume; Cabrera Estanyol, Ferran de; Juan Zornoza, José Miguel (Institute of Electrical and Electronics Engineers (IEEE), 2018)
Text en actes de congrés
Accés obertReal-time detection of cycle-slips on undifferenced carrier-phase measurements is an important task to properly exclude wrong phase trackers from precise positioning algorithms. The detection is especially challenging in ... -
Near-far resistant CML propagation delay estimation and multi-user detection for asynchronous DS-CDMA systems
Rey Micolau, Francesc; Vázquez Grau, Gregorio; Riba Sagarra, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 1999)
Text en actes de congrés
Accés obertMulti-user receivers in asynchronous direct sequence code division multiple access (DS-CDMA) systems require the knowledge of several parameters such as timing delay between users. The goal of this work is to present a ... -
Noise enhancement and SNR equivalence in Bernoulli nonuniform sampling
Font Segura, Josep; Vázquez Grau, Gregorio; Riba Sagarra, Jaume (2011)
Text en actes de congrés
Accés restringit per política de l'editorialThis paper addresses the problem of nonuniform spectral analysis and spectrum sensing by means of Bernoulli sampling. The statistical treatment of sampling shows that nonuniformly sampling below the Nyquist rate produces ... -
Non-data-aided frequency offset and symbol timing estimation for binary CPM: performance bounds
Riba Sagarra, Jaume; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2000)
Text en actes de congrés
Accés obertThe use of (spectrally efficient) CPM modulations may lead to a serious performance degradation of the classical non-data-aided (NDA) frequency and timing estimators due to the presence of self noise. The actual performance ... -
Nonuniform sampling walls in wideband signal detection
Font Segura, Josep; Vázquez Grau, Gregorio; Riba Sagarra, Jaume (2014-01-01)
Article
Accés obertThis work shows the existence of sampling walls in detection of wideband signals from Bernoulli nonuniform sampling (BNS) in the presence of noise uncertainty. A sampling wall is defined as the sampling density below which ... -
Nota tècnica 1: projecte SETRAM
Sala Álvarez, José; Riba Sagarra, Jaume; Rey Micolau, Francesc; Villares Piera, Nemesio Javier; Vázquez Grau, Gregorio; Lamarca Orozco, M. Meritxell (2008-02-26)
Altres
Accés restringit per acord de confidencialitatUn dels aspectes més crítics per assolir una definició avançada i realista del sistema SETRAM és la identificació de les tecnologies més adequades per a la localització d’usuaris mòbils, des de les ja existents (aplicables ... -
Novel periodogram and Capon spectral analysis based on nonuniform sampling
Font Segura, Josep; Vázquez Grau, Gregorio; Riba Sagarra, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
Text en actes de congrés
Accés restringit per política de l'editorialThe spectrum analysis problem based on the periodogram and Capon estimates from a nonuniformly sampled signal is addressed. The nonuniform sampling process is cast as a linear projection matrix which encompasses several ... -
On infinite past predictability of cyclostationary signals
Riba Sagarra, Jaume; Vila Insa, Marc (Institute of Electrical and Electronics Engineers (IEEE), 2022)
Article
Accés obertThis paper explores the asymptotic spectral decomposition of periodically Toeplitz matrices with finite summable elements. As an alternative to polyphase decomposition and other approaches based on Gladyshev representation, ... -
On the estimation of Tsallis entropy and a novel information measure based on its properties
Martí Espelt, Aniol; Cabrera Estanyol, Ferran de; Riba Sagarra, Jaume (2023-06-30)
Article
Accés obertThis letter explores a plug-in estimator of second-order Tsallis entropy based on Kernel Density Estimation (KDE) and its implicit regularization process. First, it is shown that the expected value of the estimator corresponds ... -
Proyecto AVANT. Estudio de técnicas de sincronización para relaciones señal a ruido muy bajas. D11: Disseny del codificador i descodificador del turbo-codi de l'estàndard DVB-RCS
Lamarca Orozco, M. Meritxell; Ramírez Javega, Francisco; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio; Villares Piera, Nemesio Javier (2010-07-16)
Report de recerca
Accés restringit per acord de confidencialitatThis document contains the instructions for the design of the DVB-RCS turbo-code. Both the algorithmic and implementation issues are addressed in the document. -
Proyecto AVANT. Estudio de técnicas de sincronización para relaciones señal a ruido muy bajas. D12. Disseny i simulació dels algorismes de sincronització
Villares Piera, Nemesio Javier; Font Segura, Josep; Lamarca Orozco, M. Meritxell; Matas Navarro, David; Ramírez Javega, Francisco; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio (2010-07-16)
Report de recerca
Accés restringit per acord de confidencialitatIn this document, the synchronization algorithms developed during the project are presented and simulated. The studied algorithms are designed for a QS-CDMA system operating in the low SNR regime, i.e., at low Es/No values ... -
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 obertThis 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 obertThis 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 obertThe 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 obertThe 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 obertThe 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 obertA 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 ...