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Class Radio Wave Communications

  • Presentation

    Presentation

    The scope of this unit encompasses the study of Microwave Radio Links, as a fundamental element of Telecommunications Networks. Technical elements are addressed, namely, attenuation, reflection, dispersion and fading, as well as the strategies to mitigate them, in a normative ITU-R context. Moreover, the design component arises as an element that links the physical phenomena with the normative context and the concepts of service quality, reliability, and cost benefit analysis. The pertinence of this unit is the clear: (i) Microwave Links are still widely used in Telecommunications Networks, in both temporary and permanent connections, namely, when the latter are placed in difficult access terrain, areas with low client density, or unstable geopolitical scenarios. (ii) The physical challenges of Microwave links are in all similar to those of Satellite Links.

  • Code

    Code

    ULHT2531-16931
  • Syllabus

    Syllabus

    Content description

    1. Introduction to Microwave Radio Links
      1. Motivation and objectives;
    2. Propagation:
      1. Physical mechanisms propagation and attenuation of links;
    3. Fading:
      1. Causes and models for the description of this phenomenon
    4. Passive and Active Relay Stations
      1. Framing and application;
    5. Diversity, combination and equalization
      1. Strategies for mitigating the effects of fading;
    6. Digital Modulations
      1. Modulations commonly applied in microwave links, and their respective error rate analysis;
    7. Design of a Microwave Link
      1. Analysis of the technical constrains;
      2. Cost/benefit analysis;
  • Objectives

    Objectives

    It is intended that the student acquires the technical skills to, in an autonomous way, be able to plan a microwave radio link, analogic or digital, accounting for the different design aspects. The student will be able to account for the effects of attenuation, in its multiple forms, i.e., reflections, dispersion and fading. Finally, the student will be able to estimate installations and exploration costs and return rates. The main skills developed throughout the course are:

    1. Familiarization with the basic concepts for the analysis and planning of microwave radio links;

    2. Familiarization with the specific constrains and ITU-R norms for microwave radio links;

    3. Familiarization with software tools for project support, namely "Google Earth" for station positioning; "Mathematica", "Matlab" and "Excel" for the calculation of operating margins;

    4. Familiarization with the concepts of quality of service, reliability, user, and cost/performance ratio of a communications system;

  • Teaching methodologies and assessment

    Teaching methodologies and assessment

    Supply of a set of study material, in digital form, namely, slides and exercices. Use of simulation software.

  • References

    References

    • Salema, Carlos - Feixes Hertzianos. 3ª edição. Lisboa :IST Press, 2011. Capa Mole. 978-972-8469-21-4.
    • Smith, David R. - Digital Transmission Systems. 3rd edition, US: Springer, 2004. Capa Dura.  978-1-4419-8933-8.

     

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