Distribution Signals between the Transmitter and Antenna – Event B Model: Distribution TV Signal

Distribution Signals between the Transmitter and Antenna – Event B Model: Distribution TV Signal

Ivo Lazar, Said Krayem, Denisa Hrušecká
Copyright: © 2017 |Pages: 39
DOI: 10.4018/978-1-5225-0565-5.ch008
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Abstract

What we have solved: the possibility to receive DVB-T (Digital Video Broadcasting Terrestrial) with respect to local conditions for signal. We have deduced: variables that represent a set of so-called useful signal, i.e. the signal suitable for further processing – amplification and distribution. As a case study we have choosed few examples using Event B Method to show possibilty of solving komplex projects by this method. The resulting program can be proven to be correct as for its theoretical backgrounds. It is based on Zermelo-Fraenkel set theory with axion of choice, the concept of generalized substitution and structuring mechanismus (machine, refinement, implementation). B methods are accompanied by mathematical proofs that justify them. Abstract machine in this example connected with mathematical modelling solves an ability to receive DVB-T signal from the plurality of signals, both useful and useless for further processing.
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Background

Standard receiving equipment for digital broadcasting means:

  • 1.

    Revenue on fixed dish, receiver (digital TV, set-top box in conjunction with analog TV or PC) with a minimum of 30 μVdB sensitivity (-77 dBm) connected by coaxial cable to a fixed receiving antenna (Czech Telecommunications Office, 2008).

  • 2.

    The standard reception equipment for analog or digital television is also considered as a common TV antenna or cable television distribution group home, even if the receiving antenna array located outside the fed group home.

Measuring method:

  • •

    Measurement point instead of the measured reception of television signals, which are composed of one or more measuring points.

  • •

    Test kit for measuring the intensity of the electromagnetic field kit consisting of antenna, power and measuring device (spectrum analyzer).

The method used is based on empirical measurements of MERc (Modulation Error Ratio), Pre-BER (Bit Error Ratio before correction), Post-BER (Bit Error Ratio after correction), spectrum analyzer DREAMSKY TS-80 (Dreamsky, 2013).

Another method used for DVB-T is to create coverage maps by measuring the intensity of the electromagnetic field. The measuring point is determined by geographical coordinates in WGS84 system, or the address or description (DRAFT DECREE, 2008).

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The Choice Of An Antenna For Dvb-T Reception

From the point of view of the need for remote reception of transmitters in the area of Strážnicko-Veselsko (county of Hodonín) from Austria(Vienna-Kahlenberg), Brno (Kojál), Mikulov (Děvín), Zlín (Tlustá Hora), Nové Mesto nad Váhom (Javořina) it´s necessary to use antennae with the biggest gain possible for a sufficient quality of recorded signals. With respect to this, antennae of YAGI type are a logical choice. Antennae of this type get a gain proportional to the size and number of elements (directors).

From this reason the broadband antenna of Iskra UHF-91X (Řezáč, 2010), (Wolff, 2006) with a gain of 14–16 dBi has been chosen and used. The base of YAGI antena is formed by a boom where the particular elements are placed:

  • •

    Director,

  • •

    Radiator (dipole),

  • •

    Reflector.

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