• Adaptive s-aloha cdma as an alternative way of integrating services in mobile environments 

    Sallent Roig, José Oriol; Agustí Comes, Ramon (2000-05)
    Article
    Accés obert
    Code-division multiple-access (CDMA) schemes appear to be very promising access techniques for coping with the requirements of third-generation mobile systems, mainly because of their flexibility. This paper proposes an ...
  • An efficient data transmission policy in an integrated voice-data ds-cdma network 

    Sallent Roig, José Oriol; Agustí Comes, Ramon (IEEE Vehicular Technology Society, 1998)
    Text en actes de congrés
    Accés obert
    CDMA schemes appear to be promising access techniques for coping with the requirements of third-generation mobile systems, mainly because of their flexibility. This paper proposes an adaptive S-ALOHA DS-CDMA access scheme ...
  • Blind channel estimation and data detection using hidden Markov models theory 

    Antón Haro, Carles; Rodríguez Fonollosa, José Adrián; Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997-01-01)
    Article
    Accés obert
    In this correspondence, we propose applying the hidden Markov models (HMM) theory to the problem of blind channel estimation and data detection. The Baum–Welch (BW) algorithm, which is able to estimate all the parameters ...
  • 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)
    Text en actes de congrés
    Accés obert
    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 ...
  • 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 ...