Planificación de frecuencias de Televisión Digital Terrestre (TDT) con áreas de adjudicación en el ecuador.

Abstract

The digital terrestrial television (DTT) respecting to the analog television broadcast, provides greater soundness to the signal against noise and interference. In addition, it allows the transmission of several television channels by the same radio channel and optimizes the use of the radio electric spectrum by using single frequency networks (SFN) allowing the release of certain frequency bands usually assigned to broadcasting. For the process of transition from analog to digital television, the simulcast is carried out, where analog and digital signals coexist. Therefore, the objective was to determine a frequency planning for the country, where, it must be taken into account coordination areas, location of transmitters and protection distances for the deployment of the DTT network with the assigned frequencies. First of all, the network of transmitters of the television channel of Ecuador TV was deployed, which has 96 transmitters in the different provinces of the country. The technical study details the different parameters of the ISDB-TB standard and technical elements that constitute the proposal. In addition, the appropriate mode for the transmission and coverage of the radiated signal was determined based on the international recommendation of the International Telecommunication Union (ITU) and the technical standard established by the telecommunications control and regulation agency (ARCOTEL). The optimal distance for the reuse of the frequency was determined, the delays were modified to optimize the SFN network and minimize the interference inherent to the network. It was determined that mode 3 is the recommended one with a guard interval of a quarter, since the maximum distance between transmitters does not exceed the distance of the mode, the modulation of 64-QAM for the transmission. Once the DTT network was optimized, a sequential coloring algorithm was used to determine appropriate allocation zones and establish the number of frequencies to be used. Finally, the recommendations for the planning of frequencies that constitute a useful manual for the deployment of DTT networks in Ecuador are presented.