Now showing items 21-40 of 43

    • Detectores duales de frecuencia dependientes de los datos en comunicaciones digitales 

      Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (Universidad de Málaga, 1992)
      Conference report
      Open Access
    • Diversity in mobile communications for blind detection of block-coded modulations 

      Vázquez Grau, Gregorio; Rey Micolau, Francesc; Lamarca Orozco, M. Meritxell; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Conference report
      Open Access
      Spatial, temporal, and frequency diversity structures are analyzed to address the blind equalization problem in the presence of time-variant frequency selective channels. The aim of the paper is to present equalization ...
    • Diversity techniques for blind channel equalization in mobile communications 

      Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 1997)
      Conference report
      Open Access
      A blind algorithm for channel distortion compensation is presented which can be employed in spatial or temporal diversity receivers. The proposed technique can be used in frequency selective and frequency flat fading mobile ...
    • Diversity techniques for blind equalization in mobile communications 

      Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (1997)
      Conference report
      Open Access
      This paper deals with blind equalization of mobile channels, which are either frequency-selective or multiplicative. The proposed algorithm can be used for channel distortion compensation in diversity systems subject ...
    • Estimacio de frequencia en comunicacions via satel.lit amb dfd's adaptatius 

      Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (1994-06)
      Article
      Open Access
      Senyal i comunicacions digitals per satèl·lit. Mètodes de descomposició en valors singulars, per estimació conjunta de freqüència i sincronisme de bit SENYAL I COMUNICACIONS DIGI
    • Examen Final 

      Lamarca Orozco, M. Meritxell (Universitat Politècnica de Catalunya, 2013-01-16)
      Exam
      Restricted access to the UPC academic community
    • 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 ...
    • Linear precoding for mutual information maximization in MIMO systems 

      Lamarca Orozco, M. Meritxell (2010)
      Conference report
      Open Access
      We study the design of linear precoders for maximization of the mutual information in MIMO systems with arbitrary constellations and with perfect channel state information at the transmitter. We derive the structure of ...
    • List message passing algorithm for noiseless compressed sensing 

      Ramírez Javega, Francisco; Lamarca Orozco, M. Meritxell (2015)
      Conference report
      Open Access
      We propose a verification-based algorithm for noiseless Compressed Sensing that reconstructs the original signal operating on a sparse graph. The proposed scheme has affordable computational complexity and its performance ...
    • MMSE decoding for analog joint source channel coding using Monte Carlo importance sampling 

      Hu, Yichuan; García Frías, Javier; Lamarca Orozco, M. Meritxell (2009)
      Conference report
      Open Access
      We investigate the performance of a discrete-time all-analog-processing joint source-channel coding system for the transmission of i.i.d. Gaussian sources over additive white Gaussian noise (AWGN) channels. At the encoder, ...
    • Multichannel receivers from ofdm and tdma in mobile communications 

      Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (IEEE IEEE, 1997)
      Conference report
      Open Access
      This paper addresses the use of multichannel receivers for blind equalization in TDMA under frequency selective channels and OFDM systems in frequency flat fading channels. A new criteria is proposed for blind equalization ...
    • Non-linear graph-based codes for joint source-channel coding 

      Matas Navarro, David; Lamarca Orozco, M. Meritxell; García Frías, Javier (2010)
      Conference report
      Open Access
      We study the behavior of a new family of nonlinear graph-based codes, previously introduced for compression of asymmetric binary memoryless sources, for the joint source-channel coding scenario in which the codewords are ...
    • Non-linear graph-based codes for source coding 

      Matas Navarro, David; Lamarca Orozco, M. Meritxell; García Frías, Javier (2009)
      Conference report
      Open Access
      We introduce a new family of graph-based source codes that can be regarded as a nonlinear generalization of LDPC codes, and apply them to the compression of asymmetric binary memoryless sources. Simulation results and the ...
    • 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 ...
    • Optimum power allocation and bit loading for BICM systems 

      Matas Navarro, David; Lamarca Orozco, M. Meritxell (2010-07-01)
      Article
      Open Access
      This paper introduces a joint bit loading and power allocation algorithm for systems combining bit-interleaved coded modulation (BICM) with multicarrier transmission. The proposed algorithm maximizes the mutual information, ...
    • Optimum power allocation and bit loading with code rate constraints 

      Matas Navarro, David; Lamarca Orozco, M. Meritxell (2009)
      Conference report
      Open Access
      In this paper, a new power allocation and bit loading policy is defined for those systems working with a preselected binary channel code and specific bit error rate (BER) requirements. It consists on the maximization of ...
    • Progressive encoding with non-linear source codes for compression of low-entropy sources 

      Ramírez Javega, Francisco; Lamarca Orozco, M. Meritxell; García Frías, Javier (2010)
      Conference report
      Open Access
      We propose a novel scheme for source coding of non-uniform memoryless binary sources based on progressively encoding the input sequence with non-linear encoders. At each stage, a number of source bits is perfectly recovered, ...
    • 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.
    • 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)
      External research report
      Restricted access - confidentiality agreement
      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 ...