Exploració per autor "Villares Piera, Nemesio Javier"
Ara es mostren els items 1-20 de 65
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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, ... -
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. -
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)
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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
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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
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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
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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
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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
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Asymptotic and finite user PER analysis of successive interference cancellation in DS-CDMA
Sala Álvarez, José; Villares Piera, Nemesio Javier; Rey Micolau, Francesc (2011-11)
Article
Accés obertAn expression is derived for the average Packet Error Rate (PER) of a Successive Interference Canceller (SIC) for DS-CDMA when the number of users asymptotically tends to infinity. The asymptotic probability density function ... -
Asymptotically optimum energy profile for successive interference cancellation in DS-CDMA under a power unbalance constraint
Sala Álvarez, José; Rey Micolau, Francesc; Villares Piera, Nemesio Javier (2012-02)
Article
Accés obertA new Ordinary Differential Equation (ODE) governing the SNIR evolution of a Successive Interference Canceller (SIC) for DS-CDMA is derived when the number of users tends to infinity and all users share the same channel ... -
Binary graphs and message passing strategies for compressed sensing in the noiseless setting
Ramírez Javega, Francisco; Lamarca Orozco, M. Meritxell; Villares Piera, Nemesio Javier (Institute of Electrical and Electronics Engineers (IEEE), 2012)
Text en actes de congrés
Accés restringit per política de l'editorialWe propose a scheme for Compressed Sensing in the noiseless setting that reconstructs the original signal operating on a binary graph where the samples are obtained sequentially. The proposed scheme has an affordable ... -
Channel-aware energy allocation for throughput maximization in massive low-rate multiple access
Molina Oliveras, Francesc; Sala Álvarez, José; Rey Micolau, Francesc; Villares Piera, Nemesio Javier (Institute of Electrical and Electronics Engineers (IEEE), 2019)
Text en actes de congrés
Accés obertA multiple access (MA) optimization technique for massive low-rate direct-sequence spread spectrum communications is analyzed in this work. A dense network of users transmitting at the same rate to a common central node ... -
Cramer-Rao bounds for SNR estimation of oversampled linearly modulated signals
López Valcarce, Roberto; Villares Piera, Nemesio Javier; Riba Sagarra, Jaume; Gappmair, Wilfried; Mosquera Nartallo, Carlos (2015-04-01)
Article
Accés obertMost signal-to-noise ratio (SNR) estimators use the receiver matched filter output sampled at the symbol rate, an approach which does not preserve all information in the analog waveform due to aliasing. Thus, it is relevant ... -
D1. Estudio de códigos PN para mejorar el ensanchado y la eficiencia espectral del sistema CDMA síncrono y asíncrono
Lamarca Orozco, M. Meritxell; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio; Villares Piera, Nemesio Javier (2008-11-10)
Report de recerca
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D2. Estructuras de detector multiusuario para CDMA síncrono y asíncrono
Lamarca Orozco, M. Meritxell; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio; Villares Piera, Nemesio Javier (2008-11-10)
Report de recerca
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D3. Sincronización robusta de frecuencia y fase para M-PSK sobre CDMA
Lamarca Orozco, M. Meritxell; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio; Villares Piera, Nemesio Javier (2008-11-10)
Report de recerca
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DA-GLRT burst detection and synchronization based on a chirp-like preamble
Rodríguez, E; Lamarca Orozco, M. Meritxell; López Salcedo, José Antonio; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio; Villares Piera, Nemesio Javier; Jalón, A (2008)
Text en actes de congrés
Accés restringit per política de l'editorialA specific preamble for the tasks of signal detection and synchronization in burst digital communications is presented. The preamble resembles a chirp signal used in RADAR applications. Its main benefit is that it allows ...