Exploració per autor "Sala Álvarez, José"Més informacióMés informació

Ara es mostren els items 84-103 de 109

    • Joint energy and rate allocation for successive interference cancellation in the finite blocklength regime 

      Molina Oliveras, Francesc; Sala Álvarez, José; Villares Piera, Nemesio Javier; Rey Micolau, Francesc (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Comunicació de congrés
      Accés obert
      This work addresses the optimization of the network spectral efficiency (SE) under successive interference cancellation (SIC) at a given blocklength n. We adopt a proof-of-concept satellite scenario where network users can ...

    • LAVICAD: LAboratori VIrtual de Comunicacions Analògiques i Digitals 

      Cabrera-Bean, Margarita; Giró Nieto, Xavier; Rey Micolau, Francesc; Gasull Llampallas, Antoni; Casas, Josep; Villares Piera, Nemesio Javier; Fernández Rubio, Juan Antonio; Sala Álvarez, José; Espinosa Fricke, Pedro; Fernández, Carlos Marcos; Cortes, Silvia; Muntanyola, Mireia; Farré, Miquel Angel (2009-02-12T09:27:53Z)
      Comunicació de congrés / Text en actes de congrés
      Accés obert
      Mitjançant el present ajut s’ha ampliat l’aplicació en xarxa LAVICAD (LAboratori VIrtual de COmunicacions Analògiques i Digitals) que s’ofereix de forma integrada dins de la plataforma d’e-learning COM@WEB. LAVICAD és ...

    • Low-rank data matrix recovery with missing values and faulty sensors 

      Lopez Valcarce, Roberto; Sala Álvarez, José (2019)
      Comunicació de congrés
      Accés obert
      In practice, data gathered by wireless sensor networks often belongs in a low-dimensional subspace, but it can present missing as well as corrupted values due to sensor malfunctioning and/or malicious attacks. We study the ...

    • Minimum PER user-energy profile for massive SIC receivers under an average energy constraint 

      Sala Álvarez, José; Rey Micolau, Francesc; Villares Piera, Nemesio Javier; Molina Oliveras, Francesc (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Comunicació de congrés
      Accés obert
      Interference may pose a severe limitation to massive wireless multiple access unless the central receiver is endowed with strong multipacket reception capabilities. In that respect, Interference Cancellation (IC) has been ...

    • Multiantenna GLR detection of a gaussian signal in spatially uncorrelated noise 

      Sala Álvarez, José (2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The exact all-SNR Generalized Log-likelihood Ratio Test (GLRT) of a Gaussian rank-one signal impinging on an 𝑀- antenna receiver in unknown spatially uncorrelated white noise is derived and compared with some previous ...

    • Multiantenna GLR detection of rank-one signals with known power spectral shape under spatially uncorrelated noise 

      Sala Álvarez, José; Vázquez Vilar, Gonzalo; López Valcarce, Roberto; Sedighi, Saeid; Taherpour, Abbas (2016-12-01)
      Article
      Accés obert
      We establish the generalized likelihood ratio (GLR) test for a Gaussian signal of known power spectral shape and unknown rank-one spatial signature in additive white Gaussian noise with an unknown diagonal spatial ...

    • Multiantenna GLR detection of rank-one signals with known power spectrum in white noise with unknown spatial correlation 

      Sala Álvarez, José; Vázquez Vilar, Gonzalo; López Valcarce, Roberto (2012-06)
      Article
      Accés restringit per política de l'editorial
      Multiple-antenna detection of a Gaussian signal with spatial rank one in temporally white Gaussian noise with arbitrary and unknown spatial covariance is considered. This is motivated by spectrum sensing problems in the ...

    • Multiantenna spectrum sensing exploiting spectral a priori information 

      Vázquez Vilar, Gonzalo; López Valcarce, Roberto; Sala Álvarez, José (2011-12)
      Article
      Accés restringit per política de l'editorial
      Dynamic Spectrum Access (DSA) is receiving considerable interest as a means to improve spectral usage in licensed bands. In order to avoid interference to licensed users, spectrum sensing has emerged as an enabling technology ...

    • Multiantenna spectrum sensing for cognitive radio: overcoming noise uncertainty 

      López Valcarce, Roberto; Vázquez Vilar, Gonzalo; Sala Álvarez, José (2010)
      Text en actes de congrés
      Accés obert
      Spectrum sensing is a key ingredient of the dynamic spectrum access paradigm, but it needs powerful detectors operating at SNRs well below the decodability levels of primary signals. Noise uncertainty poses a significant ...

    • 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 confidencialitat
      Un 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 ...

    • On the performance of Hadamard ratio detector-based spectrum sensing for cognitive radios 

      Sedighi, Saeid; Taherpour, Abbas; Sala Álvarez, José; Khattab, Tamer (2015-07-15)
      Article
      Accés obert
      We consider the problem of multiantenna spectrum sensing (SS) in cognitive radios (CRs) when the receivers are assumed to be uncalibrated across the antennas. The performance of the Hadamard Ratio Detector (HRD) is analyzed ...

    • Optimal power control law for equal-rate DS-CDMA networks governed by a successive soft interference cancellation scheme 

      Molina Oliveras, Francesc; Sala Álvarez, José; Villares Piera, Nemesio Javier; Rey Micolau, Francesc (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés obert
      This paper studies the throughput maximization of a dense multiple access network of low-rate subscribers that share the same practical Forward Error Correction (FEC) code and modulation scheme, and transmit to a central ...

    • Optimum energy allocation for massive spread-spectrum multiple access in networks of uncoordinated energy-limited terminals 

      Villares Piera, Nemesio Javier; Rey Micolau, Francesc; Sala Álvarez, José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés obert
      This paper derives the energy allocation policy that maximizes the aggregate spectral efficiency of an uncoordinated spread-spectrum multiple access network operating in the large-user regime and subject to a longterm ...

    • 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 confidencialitat
      This 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 confidencialitat
      In 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 ...

    • Pulsar navigation 

      Sala Álvarez, José; Urruela Planas, Andreu; Villares Piera, Nemesio Javier; Romeu Robert, Jordi; Blanch Boris, Sebastián; Estalella Boadella, Robert; Paredes, J. M. (European Space Agency (ESA), 2008-12-31)
      Article
      Accés restringit per política de l'editorial
      This paper evaluates the fundamental performance bounds, signal processing and technological complexity associated with the synchronization to radio and X-ray pulsars as well as its impact on the positioning accuracy of ...

    • Rate allocation in massive multiple access combining successive decoding with error control 

      Molina Oliveras, Francesc; Sala Álvarez, José (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
      Accés obert
      The Gaussian multiple access channel under asymptotically many code-division-multiple-access users and successive interference cancellation (SIC) is investigated in this work. Users transmit n-symbol packets and select ...

    • Regions de decisió i cota de la unió 

      Sala Álvarez, José (2018-10-01)
      Report de recerca
      Accés obert
      Aquest document presenta de forma gràfica: - La determinació de la regió de decisió R associada a un símbol complexe s = I + jQ . - La determinació de la seva probabilitat d’error i la d’una cot a superior (Cota de la ...

    • SENYALS I SISTEMES (Examen 2n Quadr.) 

      Sala Álvarez, José (Universitat Politècnica de Catalunya, 2002-04-01)
      Examen
      Accés restringit a la comunitat UPC

    • SENYALS I SISTEMES (Examen 2n Quadr.) 

      Sala Álvarez, José (Universitat Politècnica de Catalunya, 2002-06-01)
      Examen
      Accés restringit a la comunitat UPC