Now showing items 1-8 of 8

    • A flexible protocol communications approach for a supervisory system 

      Valle Alarcón, Rafael; Serrat Fernández, Juan (Institute for Communication Technology Management (CTM), 1989)
      Conference report
      Open Access
      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)
      Conference report
      Open Access
      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)
      Conference report
      Open Access
      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)
      Conference report
      Open Access
      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)
      Conference report
      Open Access
      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
      Restricted access - publisher's policy
      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)
      Conference report
      Open Access
      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)
      Conference report
      Open Access
      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 ...