Exploració per autor "Font Segura, Josep"
Ara es mostren els items 1-20 de 23
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ANTARES Project (Bridging Phase). Payload carrier synchronization : algorithms and simulations
Font Segura, Josep; Matas Navarro, David; Ramírez Javega, Francisco; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio; Villares Piera, Nemesio Javier (2011-11-23)
Report de recerca
Accés restringit per acord de confidencialitatInforme final Bridging Phase. Versió 3.2 -
ANTARES Project (Phase B). Multiple acces scheme definition. Diverse trade-offs analysis for TDMA and CDMA
Villares Piera, Nemesio Javier; Font Segura, Josep; Matas Navarro, David; Ramírez Javega, Francisco; Lamarca Orozco, M. Meritxell; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio (2010-03-01)
Report de recerca
Accés restringit per acord de confidencialitat -
ANTARES Project (Phase B). Multiple acces scheme definition. Spectral efficiency analysis of the MAC techniques considered for the Antares forward and return links
Villares Piera, Nemesio Javier; Font Segura, Josep; Matas Navarro, David; Ramírez Javega, Francisco; Lamarca Orozco, M. Meritxell; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio (2010-07-01)
Report de recerca
Accés restringit per acord de confidencialitat -
ANTARES Project (Phase B). Multiple acces scheme definition. Successive interference cancellation for A-CDMA
Villares Piera, Nemesio Javier; Font Segura, Josep; Matas Navarro, David; Ramírez Javega, Francisco; Lamarca Orozco, M. Meritxell; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio (2010-05-01)
Report de recerca
Accés restringit per acord de confidencialitat -
ANTARES Project (Phase B). Multiple access scheme definition. Impact of the aeronautical channel on the MAC techniques considered for the Antares forward and return links
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 (2010-03-01)
Report de recerca
Accés restringit per acord de confidencialitat -
ANTARES Project (Phase B). Physical layer definition. Equalization detailed design
Villares Piera, Nemesio Javier; Font Segura, Josep; Matas Navarro, David; Ramírez Javega, Francisco; Lamarca Orozco, M. Meritxell; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio (2010-08-01)
Report de recerca
Accés restringit per acord de confidencialitat -
ANTARES Project (Phase B). Physical layer definition. Payload carrier synchronization for the Antares TDMA return link
Villares Piera, Nemesio Javier; Font Segura, Josep; Matas Navarro, David; Ramírez Javega, Francisco; Lamarca Orozco, M. Meritxell; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio (2010-08-01)
Report de recerca
Accés restringit per acord de confidencialitat -
Asymptotic error exponents in energy-detector and estimator-correlator signal detection
Font Segura, Josep; Vázquez Grau, Gregorio; Riba Sagarra, Jaume (IEEE Computational Intelligence Society, 2012)
Text en actes de congrés
Accés restringit per política de l'editorialThe performance in signal detection is evaluated by the error (false-alarm and missed-detection) probabilities. However, calculating these probabilities is a difficult task in practice. This paper studies the asymptotic ... -
Compressed correlation-matching for spectrum sensing in sparse wideband regimes
Font Segura, Josep; Vázquez Grau, Gregorio; Riba Sagarra, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
Comunicació de congrés
Accés restringit per política de l'editorialIn this paper, we consider a novel compressed correlation-matching (CCM) approach for spectrum sensing of wideband sparse signals. We derive a general closed-form estimate of the wideband sparse signal level from compressed ... -
Dimension spreading for coherent opportunistic communications
Borràs Pino, Jordi; Font Segura, Josep; Riba Sagarra, Jaume; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2018)
Text en actes de congrés
Accés obertThe waveform optimization problem for opportunistic communications is addressed, based on sensing the second-order statistics of the existing transmissions. We propose a minimum-norm waveform optimization that exhibits ... -
Frequency-domain GLR detection of a second-order cyclostationary signal over fading channels
Riba Sagarra, Jaume; Font Segura, Josep; Villares Piera, Nemesio Javier; Vázquez Grau, Gregorio (2014-04-01)
Article
Accés obertCyclostationary processes exhibit a form of frequency diversity. Based on that, we show that a digital waveform with symbol period T can be asymptotically represented as a rank-1 frequency-domain vector process which ... -
Frequency-domain GLR detection of cyclostationary signals in frequency-selective channels
Font Segura, Josep; Riba Sagarra, Jaume; Villares Piera, Nemesio Javier; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2014)
Text en actes de congrés
Accés obertThe frequency diversity exhibited by cyclostationary signals is exploited in this paper. A novel rank-1 frequency-domain representation of a digital waveform is proposed to address the generalized likelihood ratio (GLR) ... -
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. ... -
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 ... -
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 ... -
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 ... -
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 ... -
Robust non-linear precoding for downlink multiuser multiple-input multiple-output orthogonal frequency-division multiplexing systems with limited feedback
Font Segura, Josep; Su, Y.; Wang, Xiaodong (2012-08-14)
Article
Accés restringit per política de l'editorialThe authors consider the robust Tomlinson–Harashima precoding (THP) for downlink multiuser multiple-input multiple-output orthogonal frequency-division multiplexing systems with quantised feedback. The authors discuss ... -
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'editorialIn 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 ...