Now showing items 21-40 of 56

  • Decentralized random energy allocation for massive non-orthogonal code-division multiple access 

    Molina Oliveras, Francesc; Villares Piera, Nemesio Javier; Rey Micolau, Francesc; Sala Álvarez, José (2019-10-07)
    Article
    Open Access
    This work studies the spectral efficiency achievable when a very large number of terminals are connected simultaneously to a central node (uplink) through independent and identically-distributed flat-fading channels. ...
  • Examen Final 

    Villares Piera, Nemesio Javier; Ruiz Mirones, Javier; Mariño, J.; Monte Moreno, Enrique (Universitat Politècnica de Catalunya, 2014-01-15)
    Exam
    Restricted access to the UPC academic community
  • Examen Final 

    Hernando, J.; Mariño, J.; Monte Moreno, Enrique; Villares Piera, Nemesio Javier (Universitat Politècnica de Catalunya, 2014-01-08)
    Exam
    Restricted access to the UPC academic community
  • Examen Final 

    Hernando, J.; Mariño Acebal, José Bernardo; Oliveras Vergés, Albert; Villares Piera, Nemesio Javier (Universitat Politècnica de Catalunya, 2015-06-16)
    Exam
    Restricted access to the UPC academic community
  • Examen Final 

    Oliveras Vergés, Albert; Mariño Acebal, José Bernardo; Hernando Pericás, Francisco Javier; Villares Piera, Nemesio Javier (Universitat Politècnica de Catalunya, 2014-06-10)
    Exam
    Restricted access to the UPC academic community
  • Feasibility study for a spacecraft navigation system relying on pulsar timing information 

    Sala Álvarez, José; Urruela Planas, Andreu; Villares Piera, Nemesio Javier; Estalella, R; Paredes, J M (2004-06)
    External research report
    Open Access
    Estudi de fiabilitat per un sistema de navegacio d'espai profund basat en referencies de radio-estrelles pulsants (pulsar).
  • 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
    Restricted access - publisher's policy
    Cyclostationary 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)
    Conference report
    Open Access
    The 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) ...
  • Informe final. Demostrador de serveis Galileo per Catalunya 

    Villares Piera, Nemesio Javier; Calvo Muntaner, Eduard; Carlavilla Márquez, Màxim; Lamarca Orozco, M. Meritxell; López Salcedo, José Antonio; Rey Micolau, Francesc; Riba Sagarra, Jaume; Sala Álvarez, José; Vázquez Grau, Gregorio (2007-09-25)
    External research report
    Restricted access - confidentiality agreement
  • Informe Número 1: Projecte SETRAM 

    Sala Álvarez, José; Rey Micolau, Francesc; Riba Sagarra, Jaume; Villares Piera, Nemesio Javier; Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (2008-10-01)
    External research report
    Restricted access - confidentiality agreement
    L’objectiu del projecte SETRAM és l’especificació d’algorismes de classificació no supervisada d’informació de mobilitat d’usuaris a partir de dades de posició proporcionades per la xarxa mòbil i/o satèl.lit. En el projecte ...
  • Interference power recycling in two-scale ad hoc wireless networks 

    Villares Piera, Nemesio Javier; Sala Álvarez, José; Rey Micolau, Francesc (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Open Access
    A two-scale ad hoc wireless network is envisaged in which the interference power generated in long-range connections is recycled by the surrounding wireless nodes in order to support their own short-range communications. ...
  • 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)
    Conference lecture
    Open Access
    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)
    Conference lecture / Conference report
    Open Access
    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 ...
  • 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)
    Conference lecture
    Restricted access - publisher's policy
    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 ...
  • Multipolling and OFDMA Reservation Protocol for IEEE 802.11 Networks 

    Pérez Díaz de Cerio, David; Valenzuela González, José Luis; Villares Piera, Nemesio Javier (Institute of Electrical and Electronic Engineers, 2009)
    Conference report
    Open Access
    This paper presents an efficient multipolling scheme that improves the IEEE 802.11 MAC protocol efficiency and does not suffer from the hidden terminal problem or inefficient channel usage problems. To design an efficient ...
  • 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)
    Other
    Restricted access - confidentiality agreement
    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 ...
  • 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)
    Conference report
    Open Access
    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)
    Conference report
    Open Access
    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 ...
  • Projecte COM@WEB: plataforma web d'aprenentatge intel•ligent de processament del Senyal i Comunicacions. 

    Cabrera-Bean, Margarita; Fernández Rubio, Juan Antonio; Giró, Xavier; Closas, Pau; Rey Micolau, Francesc; Fernández Prades, Carlos; Sala, Josep; Villares Piera, Nemesio Javier; Gasull Llampallas, Antoni; Casas Pla, Josep Ramon (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2007-06-28)
    Conference report
    Open Access
    La plataforma d’e-learning: comweb.upc.edu és una eina multimèdia de suport a l’estudi, l’experimentació i l’adquisició de tècniques d’auto-aprenentatge. COM@WEB s’ofereix com a punt de trobada entre estudiants, professors ...
  • 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)
    External research report
    Restricted access - confidentiality agreement
    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.