• A flexible protocol communications approach for a supervisory system 

      Valle Alarcón, Rafael; Serrat Fernández, Juan (Institute for Communication Technology Management (CTM), 1989)
      Text en actes de congrés
      Accés obert
      This paper deals with the communication protocol intended to control up to 1016 devices of a new supervisory system. It has been conceived in two complementary phases. The first one (Cycle-A) is intended to inform the ...
    • Algoritmo para optimizacion de la transferencia de datos libres de errores en canales H.F 

      Valle Alarcón, Rafael; Dalmau Royo, Jordi (1991)
      Text en actes de congrés
      Accés obert
      We present a research on error-free data transmission in H.F. radio communications. In concrete, a study on the C.C.I.T.T. recomendation V.42 and a evaluation of the optimal frame length vs. average b.e.r. of th H. F . ...
    • An in-band frequency agility modem imlemented with a DSP device 

      Dalmau, J; Delgado, J; Serrat Fernández, Juan; Valle Alarcón, Rafael (Institute of Electrical and Electronics Engineers (IEEE), 1989)
      Text en actes de congrés
      Accés obert
      The authors present a modem with in-band frequency agility that has been implemented with the TMS 32010 signal processor. A strategy based on embedded real-time channel estimation (RTCE) has been adopted to manage the ...
    • DSP based platform for an enhanced HF channel simulator 

      Serrat Fernández, Juan; Valle Alarcón, Rafael (IEE Pubs, 1997)
      Text en actes de congrés
      Accés obert
      With the aim of improving existing tools for testing new HF transmission systems, this article describes a modification of the basic Watterson (1970) model which can be implemented without any extra added complexity with ...
    • Estudio de la congestion en subcanales HF en un enlace entre Madrid y Barcelona 

      Valle Alarcón, Rafael; Serrat Fernández, Juan; Delgado Penin, José Antonio (1991)
      Text en actes de congrés
      Accés obert
      We have presented here the result of an investigation done during a year measuring the
    • Hf modem with multilevel parallel transmission using coding and rice 

      Valle Alarcón, Rafael; Delgado Penin, José Antonio (1989-12)
      Article
      Accés restringit per política de l'editorial
      We present a parallel modem for 2400 b.p.s. data transmission over high-frequency (h.f.) ionospheric channels. Time-redundancy (convolutional coding) and frequency diversity (parallel transmission with pre-encoding) are ...
    • Monitoring of a virtual infrastructure testbed 

      Magana, Edgar; Astorga Rivera, José Antonio; Serrat Fernández, Juan; Valle Alarcón, Rafael (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-11-11)
      Text en actes de congrés
      Accés obert
      This paper presents a SNMP-based Monitoring Agents for Multi-Constrain Resource Scheduling in Grids (SBLOMARS) as an effective solution for resource usage monitoring in virtual network environments. SBLOMARS is different ...
    • Transmission systems engineering teaching-a computer-aid approach 

      Delgado Penin, José Antonio; Serrat Fernández, Juan; Valle Alarcón, Rafael (1989)
      Text en actes de congrés
      Accés obert
      The authors discuss a training methodology in telecommunications transmission systems engineering based on a computer-aid approach. They begin with a justification of the uses of digital simulation and highlight its ...