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Browsing by Author "Van Wyk, MA"

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Discrete polyphase matched filtering-based soft timing estimation for mobile wireless systems

Author: Olwal, TO ; Van Wyk, MA ; Van Wyk, BJ Date: 2009 In this paper the authors present a soft timing phase estimation (STPE) method for wireless mobile receivers operating in low signal to noise ratios (SNRs). Discrete Polyphase Matched (DPM) filters, a Log-maximum a posterior probability (MAP) ... Read more
Efficient generation of random signals with prescribed probability distribution and spectral bandwidth via ergodic transformations

Author: McDonald, Andre M ; Van Wyk, MA Date: Sep 2018 A novel random signal generator design that accommodates the specification of both the sample probability distribution as well as the signal bandwidth is presented in this paper. The generator achieves a high degree of computational efficiency ... Read more
Global image feature extraction using slope pattern spectra

Author: Toudjeu, IT ; Van Wyk, BJ ; Van Wyk, MA ; Van Den Bergh, F Date: Jun 2008 Traditionally, granulometries are obtained using a series of openings or closings with convex structuring elements of increasing size. Granulometries constitute a useful tool for texture and image analysis since they are used to characterize ... Read more
Human detection for underground autonomous mine vehicles using thermal imaging

Author: Dickens, JS ; Green, JJ ; Van Wyk, MA Date: Jul 2011 Underground mine automation has the potential to increase safety, productivity and allow the mining of lower-grade resources. In a mining environment with both autonomous robots and humans, it is essential that the robots are able to detect ... Read more
Improved timing recovery in wireless mobile receivers

Author: Olwal, TO ; Van Wyk, MA ; Van Wyk, BJ ; Odhiambo, M ; Chatelain, D Date: Jun 2007 This paper presents a decentralised cross layer dynamic power control (DDPC) scheme for Wireless Mesh Networks (WMNs). A general cross-layer occupation measure (COM) based on transmission scheduling probability (TSP) and power control policy ... Read more
Note on difference spectra for fast extraction of global image information.

Author: Van Wyk, BJ ; Van Wyk, MA ; Van Den Bergh, F Date: Jun 2007 The concept of an Image Difference Spectrum, a novel tool for the extraction of global image information, is introduced. It is shown that Image Difference Spectra are fast alternatives to granulometric curves, also referred to as pattern ... Read more
Pedestrian detection for underground mine vehicles using thermal images

Author: Dickens, JS ; Van Wyk, MA ; Green, JJ Date: Sep 2011 Mine vehicles are a leading cause of mining fatalities. A reliable anti-collision system is needed to prevent vehicle-personnel collisions. The proposed collision detection system uses the fusion of a three-dimensional (3D) sensor and thermal ... Read more
Robust fitting of diurnal brightness temperature cycle

Author: Udahemuka, G ; Van Den Bergh, F ; Van Wyk, BJ ; Van Wyk, MA Date: Nov 2007 Land surface temperatures (LSTs) can be approximated from brightness temperatures observed from satellites. Estimation errors between observed brightness temperatures and a brightness temperature model of a given pixel would provide information ... Read more

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Browsing by Author "Van Wyk, MA"

Browsing by Author "Van Wyk, MA"

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