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In rural areas in Africa, the topographical conditions vary, including hilly areas or flat open areas with bushes, trees and vegetation. In some cases, road and infrastructure conditions are exceedingly poor, making it challenging and costly to provide necessary maintenance and support to communication networks. When a node goes offline the remaining nodes must be able to re-establish links with each...
Rateless erasure codes have recently attracted much attention in the communications research community. Luby transform codes being the most well known, were the first practical realisation of record-breaking sparse-graph codes, particularly for binary erasure channels. These codes have the advantage of not requiring a priori knowledge of specific channel conditions and lend itself to application in...
A joint project between the KU Leuven- and Stellenbosch Universities are currently underway to develop a space borne electronically beam steerable antenna and the associated ground-space segments. This paper covers the development of an Aircraft based Satellite Emulator to facilitate convenient aircraft based testing of an antenna array, intended for Low Earth Orbit satellite deployment. A flight...
This paper presents an implementation of analogue baseband beam steering and its digital counterpart as an attempt to compare between both methods for LEO satellite applications. Both methods are explained, implemented and compared in terms of different aspects such as power consumption, space qualification, flexibility, and speed of steering for a 1×2 prototype.
As more homes are becoming broadband enabled, a huge strain is placed on the underlying IP infrastructure. In being able to predict the types of traffic that nodes might generate, preference can be given to high priority, latency sensitive traffic. Traditionally, a home had a single computer utilizing a link to the Internet. In recent years this single computer was replaced by a multitude of smart...
This paper presents a comparison of several random number distributions for use in the back-off random variable, in a CSMA/CA protocol. These distributions are optimised for the specific case of a low earth orbit (LEO) satellite communicating with several ground stations, where the propagation time from satellite to different stations is diverse. The results of using these different distributions...
The rapid growth of vehicular traffic in many countries around the world has caused chronic congestion of traffic networks in many cities. To manage traffic networks more effectively intelligent transport systems (ITS) are required, but these systems require a communication infrastructure to operate. The availability of communication infrastructure is often a problem, especially in third world countries...
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