Thesis Open Access

INVESTIGATION OF TV WHITE SPACE FOR BROADBAND INTERNET IN ETHIOPIA

TESSEMA TARIKU TEREFE

Thesis supervisor(s)

SULTAN FEISSO (Ph.D.); HABIB MOHAMMED (Ph.D. Candidate)

In this bandwidth demanding era of the world, there is a growing need for cognitive radio
technologies to utilize the under-utilized spectrum. The under-utilized spectral includes the
one dedicated for terrestrial Television transmission. It includes the very high frequency
and ultra-high frequency range. Utilizing this for secondary use solves the bandwidth
shortage problem. But the incumbent system should not be interfered by the secondary
device. This thesis mainly focuses on finding ways to avail the free channels for secondary
use. It is tried to compare different propagation models in order to model the incumbent
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
range. The interference is mitigated by placing the secondary device at a certain distance
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
distance. In this thesis a very large contiguous band width, where more than 80% of free
channels generate at least 440MHz, is found by considering secondary device placement
at the primary transmitter, which is the worst-case scenario. For a specific point of
secondary device location also, it is found that the keep out distance is significantly affected
by antenna height than the frequency variation. Finally, it is found a throughput of
55.81Mbps generated by using TV white space. The investigation results indicate that the
use of this secondary system in Ethiopia has a great contribution in providing additional
bandwidth to the current scarcity in bandwidth for broadband internet, without interfering
the incumbent system.
 

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