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Browsing by Author "Van Wyk, BJ"

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  • Olwal, TO; Van Wyk, BJ; Djouani, K; Hamam, Y; Siarry, P; Ntlatlapa, N (ADHOC-NOW Networks & Wireless 2008, 2008-09)
    Multi-Radio Multi-Channel (MRMC) systems are key to power control problems in WMNs. Previous studies have emphasized throughput maximization in such systems as the main design challenge and transmission power control treated ...
  • Olwal, TO; Van Wyk, BJ; Djouani, K; Hamam, Y; Siarry, P; Ntlatlapa, N (2009-09)
    Multi-Radio Multi-Channel (MRMC) systems are key to power control problems in WMNs. Previous studies have emphasized through- put maximization in such systems as the main design challenge and transmission power control ...
  • Van den Bergh, F; Van Wyk, MA; Van Wyk, BJ (2006)
    This paper presents two new schemes for interpolating missing samples in satellite diurnal temperature cycles (DTCs). The first scheme, referred to here as the cosine model, is an improvement of the model proposed in [2] ...
  • Olwal, TO; Van Wyk, BJ; Djouani, K; Hamam, Y; Siarry, P; Ntlatlapa, N (SATNAC 2010, 2010-09)
    Multi-Radio Multi-Channel (MRMC) WMNs result in power control problems including interference, un-scalable connectivity and energy consumption. Several previous studies have focused on the single radio wireless configurations ...
  • Olwal, TO; Van Wyk, MA; Van Wyk, BJ (World Academy of Science, Engineering and Technology, 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 ...
  • Olwal, TO; Van Wyk, BJ; Ntlatlapa, N; Djouani, K; Siarry, P; Hamam, Y (Macrothink Institute, 2010)
    With the tremendous growth of wireless networks into the next generation to provide better services, Wireless Mesh Networks (WMNs) have emerged to offer ubiquitous communication and seamless broadband applications. WMNs ...
  • Olwal, TO; Van Wyk, BJ; Kogeda, PO; Mekuria, F (CRC Press, 2013-11)
    Autonomous foraging radio resource allocation (AFRRA) protocol; autonomous foraging radio resource allocation message (AFRRAM); energy management; FIREMAN; foraginginspired; green multi-radio networksThe tremendously rapid ...
  • Toudjeu, IT; Van Wyk, BJ; Van Wyk, MA; Van Den Bergh, F (Springer-Verlag Berlin Heidelberg, 2008-06)
    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 ...
  • Luhandjula, T; Djouani, K; Hamam, Y; Van Wyk, BJ; Williams, Q (2010-05)
    This paper describes an algorithm for a visual human-machine interface that infers a person’s intention from the motion of the hand. Work in progress shows a proof of concept tested on static images. The context for which ...
  • Olwal, TO; Van Wyk, MA; Van Wyk, BJ; Odhiambo, M; Chatelain, D (African Network for Scientific and Technological Institutions ( ANSTI), 2007-06)
    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 ...
  • Olwal, TO; Van Wyk, BJ; Djouani, K; Hamam, Y; Siarry, P; Ntlatlapa, N (Institute of Electrical and Electronics Engineering (IEEE), 2009-09)
    Multi-Radio Multi-Channel (MRMC) systems are key to power control problems in WMNs. In this paper, we present a dynamic power control for MRMC WMNs. First, WMN is represented as a set of disjoint Unified Channel Graphs ...
  • Olwal, TO; Djouani, K; Kogeda, OP; Van Wyk, BJ (De Gruyter, 2012-09)
    Wireless Backbone Networks (WBNs) equipped with Multi-Radio Multi-Channel (MRMC) configurations do experience power control problems such as inter-channel and co-channel interference, high energy consumption at the multiple ...
  • Van Wyk, BJ; Van Wyk, MA; Van Den Bergh, F (South African Institute of Electrical engineers, 2007-06)
    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 ...
  • Olwal, TO; Djouani, K; Van Wyk, BJ; Hamam, Y; Siarry, P (InTech Publishers, 2011-01)
    This chapter proposes a scalable singularly perturbed weakly-coupled TPM which is supported at the LL of the network protocol stack. Firstly, the WMN is divided into sets of unified channel graphs (UCGs). A UCG consists ...
  • Van Den Bergh, F; Udahemuka, G; Van Wyk, BJ (IEEE, 2009-07)
    A new active fire event detection algorithm for data collected with the Spinning Enhanced Visible and Infrared Imager (SEVIRI) sensor, based on the extended Kalman filter, is introduced. Instead of using the observed ...
  • Olwal, TO; Van Wyk, BJ; Djouani, K; Hamam, Y; Siarry, P; Ntlatlapa, N (2009-08)
    Multi-Radio Multi-Channel (MRMC) systems are key to power control problems in Wireless Mesh Networks (WMNs). In this paper, researchers present a range based dynamic power control for MRMC WMNs. First, WMN is represented ...
  • Udahemuka, G; Van Den Bergh, F; Van Wyk, BJ; Van Wyk, MA (18th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), 2007-11)
    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 ...
  • Olwal, TO; Van Wyk, BJ; Hamam, Y; Ntlatlapa, N (IEEE, 2009)
    This paper addresses the problem of a scalable dynamic power control (SDPC) for wireless mesh networks (WMNs) based on IEEE 802.11 standards. An SDPC model that accounts for architectural complexities witnessed in multiple ...
  • Olwal, TO; Ntlatlapa, N; Hamam, Y; Aron, F; Van Wyk, BJ; Johnson, DL (2008-09)
    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 ...