Enviaments recents

  • Emulador de canales radio para sistemas de comunicaciones móviles 

    Umbert Juliana, Anna; Díaz Romero, M. del Pilar (2000)
    Text en actes de congrés
    Accés obert
  • Red de acceso radio para el sistema de comunicaciones móviles de tercera generación (UMTS) 

    Umbert Juliana, Anna; Díaz Romero, M. del Pilar (ETSETB UPC, 2000)
    Text en actes de congrés
    Accés obert
    Una de las principales actividades que actualmente se están realizando en el mundo de las telecomunicaciones es la estandarización del sistema de comunicaciones móviles de tercera generación. Puesto que el futuro sistema ...
  • Up-link performance of the DQRUMA MAC protocol in a realistic indoor environment for W-ATM networks 

    Verikoukis, Christos; Olmos Bonafé, Juan José (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    This paper evaluates by simulation the performance of the distributed queuing request update multiple access (DQRUMA) MAC protocol in a realistic indoor environment. This protocol has been simulated in conjunction with a ...
  • Alternativas en el desarrollo de aplicaciones para móviles 

    Valenzuela González, José Luis; Sallent Roig, José Oriol; Bodas, J; Fernández, Victor (ETSETB UPC, 2000)
    Text en actes de congrés
    Accés obert
    Cuando se alcanza la etapa de madurez del mercado GSM, como sería el caso de España, se impulsan nuevos servicios y aplicaciones para móviles, cuyo desarrollo puede fundamentarse en diversas tecnologías. En esta comunicación ...
  • A radio channel emulator for WCDMA, based on the hidden Markov model (HMM) 

    Umbert Juliana, Anna; Díaz Romero, M. del Pilar (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    One of the main development and research subjects within the telecommunications area activity is the 3G mobile systems standardisation. The radio access is, of course, the main trouble in mobile systems, so it is important ...
  • On the performance of the DQRUMA with different scheduling algorithms for multimedia traffic in an indoor environment for W-ATM networks 

    Verikoukis, Christos; Olmos Bonafé, Juan José (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    The performance of the DQRUMA MAC protocol for multimedia traffic in a realistic indoor environment using the guarantee bandwidth minimising delay (GBMD) scheduling policy is evaluated by simulations. The efficiency of the ...
  • A generic radio channel emulator to evaluate higher layer protocols in a CDMA system 

    Umbert Juliana, Anna; Díaz Romero, M. del Pilar (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    Currently, we are involved in the standardisation process to specify the next mobile system generation. A wideband code division multiple access (WCDMA) system is considered in most of the region versions. It would be very ...
  • Chip level simulation of the downlink in UTRA-FDD 

    Olmos Bonafé, Juan José; Ruiz Boqué, Sílvia (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    The specifications of UMTS Terrestrial Radio Access (UTRA) for the physical layer of the downlink make use of orthogonal variable spreading factor (OVSF) codes to preserve the orthogonality between downlink channels of ...
  • A combined polling and ISMA-DS/CDMA protocol to provide QoS in packet mobile communications systems 

    Pérez Romero, Jordi; Agustí Comes, Ramon; Sallent Roig, José Oriol (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    This paper presents a new mechanism that combines the flexibility of an access protocol such as ISMA-DS/CDMA with the ability of a polling mechanism to provide a specific bound for the access delay. This protocol is proposed ...
  • An implementation of UTRAN for WINEGLASS access network emulator 

    Badini, F; SCARRONE, E; Kuehn, E; Casadevall Palacio, Fernando José; Agustí Comes, Ramon (European Commission, 2000)
    Text en actes de congrés
    Accés obert
    3G systems are designed for support of a brand new set of services (like location based services) thus, the capability to evaluate their provision in the laboratory is mandatory for their deployment. The IST WINEGLASS ...

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