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Browsing by Author "Johnson, David"

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DNS Lame delegations: A case-study of public reverse DNS records in the African Region

Author: Phokeer, A ; Aina, A ; Johnson, David Date: Dec 2016 The DNS, as one of the oldest components of the modern Internet, has been studied multiple times. It is a known fact that operational issues such as mis-configured name servers affect the responsiveness of the DNS service which could lead to ... Read more
Exploring RSSI Dependency on Height in UHF for throughput optimisation

Author: Maliwatu, R ; Lysko, Albert A ; Johnson, David Date: Nov 2016 This paper considers exploiting the unique outdoor propagation characteristics of the Ultra High Frequency (UHF) band to optimise wireless network deployments. The relationship existing between signal strength and antenna height in UHF band ... Read more
A first look at mobile internet use in township communities in South Africa

Author: Phokeer, A ; Johnson, David ; Densmore, M ; Feamster, N Date: Nov 2016 This paper presents a study of mobile data usage in South African townships. In contrast to previous studies, which have studied mobile data usage in developing regions (including South Africa), we focus our study on two townships in South ... Read more
Head to head battle of TV white space and WiFi for connecting developing regions

Author: Johnson, David ; Zlobinsky, Natasha ; Lysko, Albert A ; Lamola, Magdeline ; Hadzic, S ; Maliwatu, R ; Densmore, M Date: Dec 2016 TV White Space networks are gaining momentum worldwide as an important addition to the suite of wireless protocols available for connecting de-veloping regions. However, there has been no thorough investigation of scenarios where TV White ... Read more
Open and regionalised spectrum repositories for emerging countries

Author: Arcia-Moret, A ; Sathiaseelan, A ; Zennaro, M ; Rondón, F ; Pietrosemoli, E ; Johnson, David Date: Aug 2016 TV White Spaces have recently been proposed as an alternative to alleviate the spectrum crunch, characterised by the need to reallocate frequency bands to accommodate the ever-growing demand for wireless communications. In this paper, we ... Read more
TVWS devices spectrum mask test and analysis

Author: Lamola, MM ; Johnson, David ; Lysko, Albert A ; Zlobisnky, Natasha Date: Sep 2016 Dynamic Spectrum Access (DSA) plays a vital role in opportunistic access to spectrum. A key component of DSA is preventing interference to the incumbent (primary) user from the secondary user. We present the results of an experiment to analyze ... Read more
Work in progress: a channel selection algorithm for a TVWS mesh network

Author: Zlobinsky, Natasha ; Johnson, David Date: Sep 2016 The concept behind this work is to build mesh net-works in the TVWS band for developing regions to improve internet access opportunities. The purpose is to solve a pertinent problem within the context, namely to find an optimal or almost ... Read more

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Browsing by Author "Johnson, David"

Browsing by Author "Johnson, David"

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