Enviaments recents

  • Estudio comparativo de las matrices de correlación clásica y cíclica en arrays de banda estrecha 

    Cerquides Bueno, José Ramón; Muñoz Medina, Olga; Fernández Rubio, Juan Antonio (1993)
    Text en actes de congrés
    Accés obert
    The aim of this communication is to study the differences and similarities between the classic and cyclic correlation matrices of the data snapshots sensed by an array. We will focus our study in the comparison of ...
  • Analytic performance evaluation of cumulant-based arma system identification methods 

    Rodríguez Fonollosa, José Adrián; Vidal Manzano, José (IEEE IEEE PRESS, 1993)
    Text en actes de congrés
    Accés obert
    The authors perform an analytic study of some cumulant-based methods for estimating the AR parameters of ARMA processes. The analysis includes new AR identifiability results for pure AR process and the analytic performance ...
  • Blind multiuser detection with probabilistic algorithms - application to underwater communications 

    Antón Haro, Carles; Rodríguez Fonollosa, José Adrián; Zvonar, Zaran; Rodríguez Fonollosa, Javier (IEEE IEEE, 1997)
    Text en actes de congrés
    Accés obert
    In this paper, two probabilistic adaptive algorithms for jointly detecting active users in a DS-CDMA system are compared. The first one, which is based on the theory of hidden Markov models (HMM) is proposed within the ...
  • Multichannel receivers from ofdm and tdma in mobile communications 

    Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (IEEE IEEE, 1997)
    Text en actes de congrés
    Accés obert
    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 ...
  • Blind multiuser identification and detection in cdma systems 

    Rodríguez Fonollosa, Javier; Rodríguez Fonollosa, José Adrián; Zvonar, Z; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 1995)
    Text en actes de congrés
    Accés obert
    Multiuser detection in code division multiple access systems usually requires either knowledge of the transmitted signature sequences and channel state information or use of a known training sequence for adaptation. We ...
  • New hos-based parameter estimation methods for speech recognition in noisy environments 

    Moreno Bilbao, M. Asunción; Tortola, S; Vidal Manzano, José; Rodríguez Fonollosa, José Adrián (. S.N., 1995)
    Text en actes de congrés
    Accés obert
    The problem of recognition in noisy environments is addressed. Often, a recognition system is used in a noisy environment and there is no possibility of training it with noisy samples. Classical speech analysis techniques ...
  • Adaptive blind equalization using weighted cumulant slices 

    Vidal Manzano, José; Rodríguez Fonollosa, José Adrián (Institute of Electrical and Electronics Engineers (IEEE), 1994)
    Text en actes de congrés
    Accés obert
    Many linear methods have been proposed in the literature to blindly estimate the ARMA parameters of a time series using HOS. Nevertheless, they are mainly off-line and not much has been done in the adaptive case. The method ...
  • Optimum energy allocation for massive spread-spectrum multiple access in networks of uncoordinated energy-limited terminals 

    Villares Piera, Nemesio J.; Rey Micolau, Francesc; Sala Álvarez, José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    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 ...
  • Retrospective interference alignment for the MIMO interference broadcast channel 

    Torrellas, Marc; Agustín de Dios, Adrián; Vidal, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Retrospective Interference Alignment is a linear precoding strategy that seizes delayed channel state information at the transmitters (CSIT), improving the degrees of freedom (DoF) that can be achieved without CSIT for ...
  • Estimation of the modulation index of cpm signals using hos 

    Rodríguez Fonollosa, Javier; Rodríguez Fonollosa, José Adrián (Institute of Electrical and Electronics Engineers (IEEE), 1993)
    Text en actes de congrés
    Accés obert
    Three simple methods are proposed for the estimation of the modulation index of continuous phase modulated signals in noise. These methods employ the estimated autocorrelation and fourth-order cumulant sequences of the ...

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