Exploració per autor "Vázquez Grau, Gregorio"
Ara es mostren els items 1-20 de 134
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A non-data-aided SNR estimation technique for multilevel modulations exploiting signal cyclostationarity
Riba Sagarra, Jaume; Villares Piera, Nemesio Javier; Vázquez Grau, Gregorio (2010-11-01)
Article
Accés restringit per política de l'editorialSignal-to-noise ratio (SNR) estimators of linear modulation schemes usually operate at one sample per symbol at the matched filter output. In this paper we propose a new method for estimating the SNR in the complex ... -
A nondata-aided SNR estimation technique for multilevel modulations exploiting signal cyclostationarity
Riba Sagarra, Jaume; Villares Piera, Nemesio Javier; Vázquez Grau, Gregorio (2010-11-01)
Article
Accés obertSignal-to-noise ratio (SNR) estimators of linear modulation schemes usually operate at one sample per symbol at the matched filter output. In this paper we propose a new method for estimating the SNR in the complex additive ... -
A rain and scintillation Ka-band channel simulator
Rodríguez, E; Sala Álvarez, José; Lamarca Orozco, M. Meritxell; López, J. A.; Rey Micolau, Francesc; Riba Sagarra, Jaume; Vázquez Grau, Gregorio; Villares Piera, Nemesio Javier; Jalón, A (ESA, 2008)
Text en actes de congrés
Accés obertThis paper describes the implementation of a Ka-band satellite channel simulator with emphasis on the synthesis of scintillation processes. The problem becomes one of generating a given probability density function, ... -
A statistical reference criterion for adaptive filtering
Sala Álvarez, José; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 1996)
Text en actes de congrés
Accés obertA cost function for adaptive filtering is proposed, based on the statistical reference criterion. The purpose of this criterion is to enforce a given probability density function at the output of a system. The only ... -
A statistical reference criterion for adaptive filtering
Sala Álvarez, José; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 1996)
Text en actes de congrés
Accés obertA cost function for adaptive filtering is proposed, based on the statistical reference criterion. The purpose of this criterion is to enforce a given probability density function at the output of a system. The only ... -
Adaptive blind equalization and demodulation without channel and signal parameter extraction
Sala Álvarez, José; Vázquez Grau, Gregorio (1994)
Text en actes de congrés
Accés obertThe problem of filtering a source of known statistics in noise and/or interference of unknown statistics is addressed in this paper. In a general framework, the optimum estimation (detection) of the desired signal requires ... -
Adaptive filter solution for processing lidar returns: optical parameter estimation
Rocadenbosch Burillo, Francisco; Vázquez Grau, Gregorio; Comerón Tejero, Adolfo (1998-10)
Article
Accés restringit per política de l'editorialJoint estimation of extinction and backscatter simulated profiles from elastic-backscatter lidar return signals is tackled by means of an extended Kalman filter (EKF). First, we introduced the issue from a theoretical point ... -
Adaptive Filter Solution For Processing Lidar Returns: Optical Parameter Estimation
Rocadenbosch Burillo, Francisco; Vázquez Grau, Gregorio; Comerón Tejero, Adolfo (OPTICAL SOC AMER, 1998-01-31)
Article
Accés obertJoint estimation of extinction and backscatter simulated profiles from elastic-backscatter lidar return signals is tackled by means of an extended Kalman filter (EKF). First, we introduced the issue from a theoretical point ... -
Adaptive spectrum estimation with linear constrains
Vázquez Grau, Gregorio; Vallverdú Bayés, Sisco (1988)
Text en actes de congrés
Accés obertA general constrained adaptive metbod is developed to be applied to the spectral estimation problem. The method presented can be used in a wide range of situatious, this is, we can get different estimators wíth it. The ... -
ADC Quantization Requirements
Riba Sagarra, Jaume; Lamarca Orozco, M. Meritxell; Rey Micolau, Francesc; Sala Álvarez, José; Vázquez Grau, Gregorio; Villares Piera, Nemesio Javier (2000-06)
Report de recerca
Accés obertIn this document, we analyze the impact of the quantization at the input of the demultiplexer. The required number of bits of the Analog-to-Digital-Converter (ADC) is obtained, along with the corresponding quantization losses. -
Analizador de espectro digital de 2.048 muestras de tipo captura
Vázquez Grau, Gregorio (Fundación Universidad-Empresa, 1986)
Text en actes de congrés
Accés obertEn muchas aplicaciones, tales como geofísica, análisis de voz, calibración de instrumentos, medidas acústicas, etc. es útil el procesado digital de señal. En el presente trabajo se presenta el diseño de un procesador ... -
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 -
Array-geometry invariant signaling for MISO feedforward opportunistic communications
Borràs Pino, Jordi; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2020)
Text en actes de congrés
Accés obertThe impact of antenna array geometry on scenario- aware invariant signaling is studied in the context of feedforward opportunistic communications. Invariance plays an elemental role to guarantee the detectability in ... -
Asymptotic equivalence between the unconditional maximum likelihood and the square-law nonlinearity symbol timing estimation
López Salcedo, José Antonio; Vázquez Grau, Gregorio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-01-31)
Article
Accés obertThis paper provides a systematic approach to the problem of nondata aided symbol-timing estimation for linear modulations. The study is performed under the unconditional maximum likelihood framework where the ...