Enviaments recents

  • Average block error probability in the reverse link of a packet ds/cdma system under rayleigh fading channel conditions 

    Pérez Romero, Jordi; Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon (2000-04)
    Article
    Accés obert
    Analytic expressions have been derived for the probability density functions of the total signal-to-interference ratio when considering mixed-type interference sources in the reverse link of a DS/CDMA packet radio system ...
  • 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 ...
  • Software radio reconfigurable hardware system (share) 

    Revés Ballesté, Xavier; Gelonch Bosch, Antonio José; Casadevall Palacio, Fernando José; Garcia, José L. (2000-08)
    Article
    Accés restringit per política de l'editorial
    Recent requirements and evolution of personal communications systems will tend to increase the number of applications that will run over the same hardware/software. While an option is providing this platform with all the ...
  • A near-optimum mac protocol based on the distributed queueing random access protocol (dqrap) for a cdma mobile communication system 

    Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon; Sallent Roig, José Oriol (2000-09)
    Article
    Accés obert
    This paper presents and analyses a new near– optimum random access protocol. The proposed access scheme is suitable for a CDMA environment and minimises the total number of spreading codes needed to achieve a certain ...
  • Design and implementation of a wide-band real-time mobile channel emulator 

    Olmos Bonafé, Juan José; Gelonch Bosch, Antonio José; Casadevall Palacio, Fernando José; Femenias Nadal, Guillem (1999-05)
    Article
    Accés obert
    A new wide-band mobile channel emulator for the CODIT project is designed and implemented. The UMTS code-division testbed (CODIT R2020) is a research project within the European RACE-II program set up by the Commission of ...
  • Software tool for optimising indoor/outdoor coverage in a construction site 

    Ruiz Boqué, Sílvia; Samper, Y; Pérez Romero, Jordi; Agustí Comes, Ramon; Olmos Bonafé, Juan José (Institution of Electrical Engineers, 1998-10)
    Article
    Accés obert
    A system architecture, an empirical propagation model, and a software combined with a CAD tool, have been designed to offer mobile communication services to construction sites. Results have been validated by measurements.
  • A novel ekf-based recovery in ds scheme for ds/cdma systems tracking code delay 

    Díaz Romero, M. del Pilar; Agustí Comes, Ramon (1997-04)
    Article
    Accés restringit per política de l'editorial
    Classical delay-lock loops (DLL) have beenwidely considered for code synchronization purposes inDS/CDMA systems, although they have not been devised foroperation when channel fading is present. This paper describes a new ...
  • Performance of Blind Equalization with Higher Order Statistics in Indoor Radio Environments 

    Valenzuela González, José Luis; Valdominos Bardají, Antonio; Casadevall Palacio, Fernando José (1997-05)
    Article
    Accés obert
    This paper analyzes the performance of blind equalization using the complex cepstrum of third-order moments applied to 4-QAM time division multiple access (TDMA) indoor radio communication systems. In particular, we have ...
  • Equalization and space diversity techniques in mobile environments 

    Valdominos Bardají, Antonio; Casadevall Palacio, Fernando José (1994-04)
    Article
    Accés obert
    The development of high-quality digital mobile radio systems has become a major goal in the field of digital communications. The possibility of providing speech and data services free of wire constrictions in different ...
  • Performance analysis of qam modulations applied to the linc transmitter 

    Casadevall Palacio, Fernando José; Valdominos Bardají, Antonio (1993-11)
    Article
    Accés obert
    Future mobile radiocommunications systems will use linear modulations because they show a higher spectrum efficiency than classical FM modulations. Furthermore, in order to use these modulations in hand-portable equipment, ...

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