November 21, 2019 Thesis Open Access

TESSEMA TARIKU TEREFE

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        "affiliation": "ADDIS ABABA SCIENCE AND TECHNOLOGY UNIVERSITY", 
        "name": "TESSEMA TARIKU TEREFE"
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    "description": "<p>In this bandwidth demanding era of the world, there is a growing need for cognitive radio<br>\ntechnologies to utilize the under-utilized spectrum. The under-utilized spectral includes the<br>\none dedicated for terrestrial Television transmission. It includes the very high frequency<br>\nand ultra-high frequency range. Utilizing this for secondary use solves the bandwidth<br>\nshortage problem. But the incumbent system should not be interfered by the secondary<br>\ndevice. This thesis mainly focuses on finding ways to avail the free channels for secondary<br>\nuse. It is tried to compare different propagation models in order to model the incumbent<br>\nsignal 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<br>\nrange. The interference is mitigated by placing the secondary device at a certain distance<br>\naway 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<br>\ndistance. In this thesis a very large contiguous band width, where more than 80% of free<br>\nchannels generate at least 440MHz, is found by considering secondary device placement<br>\nat the primary transmitter, which is the worst-case scenario. For a specific point of<br>\nsecondary device location also, it is found that the keep out distance is significantly affected<br>\nby antenna height than the frequency variation. Finally, it is found a throughput of<br>\n55.81Mbps generated by using TV white space. The investigation results indicate that the<br>\nuse of this secondary system in Ethiopia has a great contribution in providing additional<br>\nbandwidth to the current scarcity in bandwidth for broadband internet, without interfering<br>\nthe incumbent system.<br>\n&nbsp;</p>", 
    "doi": "10.20372/nadre/4438", 
    "keywords": [
      "Digital Terrestrial TV  Geolocational Database Pathloss  Models, White Space Device"
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    "language": "eng", 
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          "affiliation": "ADDIS ABABA SCIENCE AND TECHNOLOGY UNIVERSITY", 
          "name": "SULTAN FEISSO (Ph.D.)"
        }, 
        {
          "affiliation": "ADDIS ABABA SCIENCE AND TECHNOLOGY UNIVERSITY", 
          "name": "HABIB MOHAMMED (Ph.D. Candidate)"
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      "university": "ADDIS ABABA SCIENCE AND TECHNOLOGY UNIVERSITY"
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    "title": "INVESTIGATION OF TV WHITE SPACE FOR BROADBAND INTERNET IN ETHIOPIA"
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