Master Dissertations

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Browsing Master Dissertations by Subject "Arusha"

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    Comparative analysis on reception of digital video broadcast-terrestrial: A case study of Arusha city
    (The University of Dodoma, 2014) Iddi, Ibrahim
    Tanzania has been among the earliest countries in Africa to employ Digital Video Broadcast-Terrestrial (DVB-T) System. The deadline for Analogue Switch Off (ASO) was set to be in 2015, but Tanzania decided to have phased switch off since 2010. DVB-T is a new system in Tanzania and hence the extent of quality of the signal needs to be established. This research compares the reception of DVB-T second generation spatial signal strength as offered by Star Media Limited, Agape Associates Limited and Basic Transmission Limited multiplexing companies in five locations of the Arusha City. The research involved two phases, first was field measurement of DVB-T signals using four different antennas and a spectrum analyzer, and secondly, customers perception on quality of the signal they receive was established using a guided interview. Measurements have shown that overall DVB-T signal strength was quiet strong in Arusha city centre, which allows spectrum analyzer to have a set point of - 10 dBm. In other areas, overall DVB-T signal strength was weak which forced to have the spectrum analyzer set point lowered to -30 dBm. The research also found all of the Digitek and Agape decoder customers were satisfied with the quality of DVBT signal they were receiving. 9 out of 10 customers of Continental decoders and 4 out of 5 Tanzania Broadcast Corporation (TBC) decoders were also satisfied with quality of signal as offered by their MUXs. Research results recommend to Multiplexers to either increase power of their existing towers in allowable ranges or to increase number of towers to strengthen signal reception in remote areas and areas in low altitude. Gap filler can be employed in town to those areas obstructed by high rise structures.
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    Performance analysis of free space optical communication under the effect of scintillation in Mwanza and Arusha regions of Tanzania
    (The University of Dodoma, 2019) Joseph, Edson
    Free Space Optics communications (FSO) has drawn a bunch of attention for a range of applications in telecommunications field. The unregulated bandwidth which is up to 200THz, security, higher speed, unlimited data rate, low deployment cost, and shortest installation time frame are the few reasons to employ FSO system. However, weather attenuation has a massive impact on the FSO transmission channel. In this study, the effect of scintillation on the performance and FSO link availability evaluation is analyzed in terms of eye diagrams, Bit Error Rate (BER) and Q-factor, the examination of signal to noise ratio (SNR) was also considered. Two prediction models Submarine Laser Communication (SLC) II and Hufnagel Valley (HV) day were compared to attain the finest prediction model performance for selected data regarding particular meteorological conditions of Mwanza and Arusha regions. HV day model had the best performance for predicting scintillation intensity for the scintillation data taken from January 2015 to December 2018 which totals up to a 48 months period. The simulation shows, the FSO transmission for below 6km distance produce the better quality signal than transmission for 8km and above distance where at 8km distance, the BER value is 10-7 which produce the bad quality signals at receiver for both two regions. However, the FSO link availability decreases with increase in transmission path, FSO link is feasible in both Arusha and Mwanza regions for about 6km range and therefore is recommended for adoption for both regions.