Browsing by Author "Tiblets, Kinfe"
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Item Coverage Planning of Digital Terrestrial Television Broadcasting in Case of Addis Ababa(Addis Ababa University, 2018-05) Tiblets, Kinfe; Dereje, Hailemariam (PhD)Digital Terrestrial Television (DTT) is a technological evolution of broadcast television and an advancement over analog television. The analog television system has been in existence in Ethiopia over the years but now Ethiopian Broadcasting Corporation (EBC) is ongoing to deploy DTT transmitter. As technology growth and introduction of different services increases, analog television system encounters with the problems of frequency scarcity, adjacent channel and co-channel interference. DTT broadcasting system is supplying technique of Single Frequency Network (SFN), in which SFN allotments allow network coverage to be progressively modified adding further transmitters without the need for re-planning frequency use as long as the constraints of the frequency plan are respected. This increases spectrum efficiency. This thesis focuses on coverage planning of digital terrestrial television broadcasting in case of Addis Ababa city. Propagation models are used to calculate path loss at certain distance from the transmitter by using the digital terrain map of Addis Ababa city. In which two types of propagation models are used, that is from the city models, COST-231 Hata model is used for estimating number of transmitters to cover Addis Ababa city, and ITU-R P1546-5 is used to select the optimum transmitter site using digital terrain map of Addis Ababa city. Hence, a single transmitter with 53 dBm output power and 90 meter transmitter antenna height is used to cover Addis Ababa city. Simulation results of this thesis work shows that 96.7% of Addis Ababa city can be covered by adding a repeater with 30 dBm output power and 30 meter antenna height around Hana Mariam. This can be considered as good coverage since more than 95% of the sub-area is served.