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Browsing by Author "Johnson, DL"

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FSL based estimation of white space availability in UHF TV bands in Bergvliet, South Africa

Author: Lysko, Albert A ; Masonta, Moshe T ; Johnson, DL ; Venter, H Date: Sep 2012 The paper describes the predictions made for Bergvliet, South Africa in terms of the availability of the frequency spectrum occupied by analogue TV broadcast around that area. The focus is made on the availability of under-used TV channels ... Read more
Internet usage and performance analysis of a rural wireless network in Macha, Zambia

Author: Johnson, DL ; Belding, EM ; Almeroth, K ; Van Stam, G Date: Jun 2010 There have been a number of rural wireless networks providing Internet access over the last decade but little is known about how the Internet is being used, how these networks perform and whether they follow similar trends when compared with ... Read more
Kwaabana: File sharing for rural networks

Author: Johnson, DL ; Belding, EM ; Mudenda, C Date: Dec 2013 As usage of online social networks and social media continues to experience exponential growth, the amount of data being shared between users is increasing without bound. While this has revolutionized communication for many Internet users, ... Read more
Performance analysis of dual 5 GHz WiFi and UHF TV white space network links

Author: Lamola, MM ; Johnson, DL ; Lysko, Albert A ; Maliwatu, R ; Densmore, M Date: Aug 2019 Commonly used WiFi is known to be ill-suited for penetrating vegetation and buildings and non-line-of-sight conditions. Television white space (TVWS) operates in ultra-high frequency (UHF) bands that overcome many of the penetration and ... Read more
Significant performance improvement obtained in a wireless mesh network using a beamswitching antenna

Author: Lysko, Albert A ; Johnson, DL ; Mofolo, MOR Date: Sep 2012 The paper describes the performance enhancement obtained by adding an electronically controlled beamswitching antenna to a laboratory set up of a wireless mesh network. The antenna permits several modes offering several beam shapes and ... Read more
Simulation and channel assignment by Simulated Annealing of a wireless mesh network using Dynamic Spectrum Access

Author: Zlobinsky, N ; Mishra, AK ; Johnson, DL ; Lysko, Albert A Date: Nov 2021 This work tackles a new angle to the Channel Assignment (CA) problem, which has otherwise been fairly widely studied for allocating channels optimally to access points and ad-hoc network nodes. Wireless Mesh Networks (WMNs) using Dynamic ... Read more
Studying an inexpensive wire discone antenna as a candidate for TVWS spectrum monitoring / sensing

Author: Lysko, Albert A ; Lee, A ; Hart, A ; Johnson, DL Date: Oct 2014 Monitoring and sensing of spectrum are becoming more and more important, as the subject of using underused TV White Spaces (TVWS) spectrum by software defined radios (SDR) and cognitive radios is advanced forward towards practical applications. ... Read more
The television white space opportunity in Southern Africa: from field measurements to quantifying white spaces

Author: Lysko, Albert A ; Masonta, Moshe T ; Johnson, DL Date: 2015 The lack of sufficient fixed-line communication infrastructure in African rural areas has resulted in wireless communication being the only cost effective alternative solution for broadband connectivity. However, access to valuable ... Read more
Transmission probability-based dynamic power control for multi-radio mesh networks

Author: Olwal, TO ; Ntlatlapa, Ntsibane S ; Hamam, Y ; Aron, F ; Van Wyk, BJ ; Johnson, DL Date: Sep 2008 This paper presents an analytical model for the selection of the transmission power based on the bi-directional medium access information. Most of dynamic transmission power control algorithms are based on the single directional channel and ... Read more
VillageLink: A channel allocation technique for wide-area white space networks

Author: Pejovic, V ; Johnson, DL ; Zheleva, M ; Belding, EM ; Lysko, Albert A Date: 2015 Internet connectivity is available to merely 39% of the world’s population. Lack of internet access is primarily restricted to developing regions, however, many remote communities in the developed world are currently disconnected as well. The ... Read more
VillageLink: Wide-Area Wireless Coverage

Author: Pejovic, V ; Johnson, DL ; Zheleva, M ; Belding, EM ; Lysko, Albert A Date: Jan 2014 White spaces promise to revolutionize the way wireless connectivity is delivered over wide areas. However, large-scale white space networks face the problem of allocating channels to multiple contending users in the wide white space band. To ... Read more

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Browsing by Author "Johnson, DL"

Browsing by Author "Johnson, DL"

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