Thesis Open Access

INVESTIGATION OF TV WHITE SPACE FOR BROADBAND INTERNET IN ETHIOPIA

TESSEMA TARIKU TEREFE


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    <subfield code="a">Digital Terrestrial TV  Geolocational Database Pathloss  Models, White Space Device</subfield>
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    <subfield code="a">SULTAN FEISSO (Ph.D.)</subfield>
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    <subfield code="a">HABIB MOHAMMED (Ph.D. Candidate)</subfield>
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    <subfield code="a">&lt;p&gt;In this bandwidth demanding era of the world, there is a growing need for cognitive radio&lt;br&gt;
technologies to utilize the under-utilized spectrum. The under-utilized spectral includes the&lt;br&gt;
one dedicated for terrestrial Television transmission. It includes the very high frequency&lt;br&gt;
and ultra-high frequency range. Utilizing this for secondary use solves the bandwidth&lt;br&gt;
shortage problem. But the incumbent system should not be interfered by the secondary&lt;br&gt;
device. This thesis mainly focuses on finding ways to avail the free channels for secondary&lt;br&gt;
use. It is tried to compare different propagation models in order to model the incumbent&lt;br&gt;
signal where it has great effect on the coverage and on the interference range in turn. ITUR P.1546-5 is found to be the best model in modeling the signals in a given frequency&lt;br&gt;
range. The interference is mitigated by placing the secondary device at a certain distance&lt;br&gt;
away from the incumbent coverage distance, known as keep out distance. For stable coexistence of the two systems, the white space device must be kept at a minimum of this&lt;br&gt;
distance. In this thesis a very large contiguous band width, where more than 80% of free&lt;br&gt;
channels generate at least 440MHz, is found by considering secondary device placement&lt;br&gt;
at the primary transmitter, which is the worst-case scenario. For a specific point of&lt;br&gt;
secondary device location also, it is found that the keep out distance is significantly affected&lt;br&gt;
by antenna height than the frequency variation. Finally, it is found a throughput of&lt;br&gt;
55.81Mbps generated by using TV white space. The investigation results indicate that the&lt;br&gt;
use of this secondary system in Ethiopia has a great contribution in providing additional&lt;br&gt;
bandwidth to the current scarcity in bandwidth for broadband internet, without interfering&lt;br&gt;
the incumbent system.&lt;br&gt;
&amp;nbsp;&lt;/p&gt;</subfield>
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