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Browsing by Author "Olwal, TO"

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Achievable capacity design for irregular and clustered high performance mesh networks

Author: Olwal, TO ; Masonta, Moshe T Date: Nov 2012 This study has presented the End to End (E2E) upper bound capacity limits for high performance mesh nodes that can be deployed in rural and remote areas. The achievable capacity limits for both irregular and clustered placements of nodes ... Read more
Analysis of achievable capacity in irregularly-placed high performance mesh nodes

Author: Olwal, TO Date: Sep 2012 Research has shown that the capacity of the wireless mesh network improves with the increase of number of radio interfaces per node and the multiplicity of the non-overlapping frequency channels. Recently, such high performance nodes (HPNs) ... Read more
Antenna research directions for 6G: A brief overview through sampling literature

Author: Olwal, TO ; Chuku, PN ; Lysko, Albert A Date: Mar 2021 Antennas are a critical component in any wireless link. The significance of their role continues to grow, together with the rise of machine-to-machine (M2M) communications and telecommunications starting to move from the fourth generation ... Read more
Antenna research directions for 6G: A brief overview through sampling literature

Author: Olwal, TO ; Chuku, PN ; Lysko, Albert A Date: Mar 2021 Antennas are a critical component in any wireless link. The significance of their role continues to grow, together with the rise of machine-to-machine (M2M) communications and telecommunications starting to move from the fourth generation ... Read more
Autonomous transmission power adaptation for multi-radio multi-channel wireless mesh networks

Author: Olwal, TO ; Van Wyk, BJ ; Djouani, K ; Hamam, Y ; Siarry, P ; Ntlatlapa, Ntsibane S Date: Sep 2008 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 as a secondary ... Read more
Autonomous transmission power adaptation for multi-radio multi-channel wireless mesh networks

Author: Olwal, TO ; Van Wyk, BJ ; Djouani, K ; Hamam, Y ; Siarry, P ; Ntlatlapa, Ntsibane S Date: Sep 2009 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 treated as a secondary ... Read more
Beam steering for circular switched parasitic arrays using a combinational approach

Author: Mofolo, ROM ; Lysko, Albert A ; Olwal, TO ; Clarke, WA Date: Sep 2011 In this paper, the authors present a method of electronic beam steering for circular switched parasitic array (SPA) antennas. In circular SPA antennas, one achieves azimuth beam steering by open-circuiting and short-circuiting different ... Read more
Bio-inspired energy and channel management in distributed wireless multi-radio networks

Author: Olwal, TO ; Masonta, Moshe T ; Mekuria, Fisseha Date: Jun 2014 In the recent past, research in the next generation wireless heterogeneous broadband networks has favoured the design of multi-radio interface over the single radio interface architectures in order to support desirable features such as a ... Read more
Cognitive radio-based transmission energy management in Wi-Fi nodes

Author: Olwal, TO ; Montsi, L Date: Oct 2012 The CSIR has developed a cognitive radio-based transmission energy management algorithm that can be used to manage the energy consumption of Wi-Fi networks in rural and remote communities in South Africa. The project demonstrates the ... Read more
Decentralized power control for multi-radio multi-channel wireless mesh networks

Author: Olwal, TO ; Van Wyk, BJ ; Djouani, K ; Hamam, Y ; Siarry, P ; Ntlatlapa, Ntsibane S Date: Sep 2010 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 while studying ... Read more
Design strategies of an off-grid solar PV plant for office buildings: A case study of Johannesburg

Author: Phasha, TC ; Aderemi, BA ; Chowdhury, SP ; Olwal, TO ; Abu-Mahfouz, Adnan MI Date: Jun 2018 Renewable energy systems based on solar resources are steering the way in grid-connected applications to meet present energy demands. This research work tends to investigate the design and feasibility of RE systems using solar resources to ... Read more
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
Distributed topology control algorithm to conserve energy in heterogeneous wireless mesh networks

Author: Aron, FO ; Olwal, TO ; Kurien, A ; Odhiambo, MO Date: Jul 2008 A considerable amount of energy is consumed during transmission and reception of messages in a wireless mesh network (WMN). Reducing per-node transmission power would greatly increase the network lifetime via power conservation in addition ... Read more
Dynamic power control for wireless backbone mesh networks: a survey

Author: Olwal, TO ; Van Wyk, BJ ; Ntlatlapa, Ntsibane S ; Djouani, K ; Siarry, P ; Hamam, Y Date: 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 are hybrid networks ... Read more
The eCOMBAT: Energy consumption monitoring tool for battery powered communication device

Author: Olwal, TO ; Montsi, L ; Mofolo, M ; Mekuria, Fisseha Date: Sep 2013 The ever rising demand for energy all over the world, following the dwindling of the fossil fuel resources and adverse effects on the climate change, has compelled the need to save energy and lower the cost of energy utilization in the wireless ... Read more
Effects of variations in structural parameters on performance of switched parasitic arrays

Author: Mofolo, MRO ; Lysko, Albert A ; Clarke, WA ; Olwal, TO Date: Sep 2011 Influences of variations in the structural parameters (or antenna dimensions) of the five elements circular switched parasitic array (SPA) antenna at 2.4 GHz are investigated in this paper. Variations in the structural parameters are assumed ... Read more
Efficient two stage spectrum sensing for cognitive radios

Author: Wasonga, F ; Olwal, TO ; Abu-Mahfouz, Adnan MI Date: Jun 2018 The growth of wireless communication in recent years has resulted to spectrum scarcity and increase in the number mobile users. However, the major concern in wireless communication is spectrum scarcity on fixed spectrum. Technologies such as ... Read more
Energy efficient topology control algorithm for wireless mesh networks

Author: Aron, FO ; Olwal, TO ; Kurien, A ; Odhiambo, MO Date: Aug 2008 The control of the topology of a network makes it possible for the network nodes to reduce their power of transmission while ensuring that network connectivity is preserved. This paper explains the need for energy consumption control in ... Read more
Energy optimization based path selection algorithm for IEEE 802.11s wireless mesh networks

Author: Mhlanga, Martin M ; Olwal, TO ; Mutanga, MB ; Adigun, MO Date: Sep 2011 It is everyone’s dream to have network connectivity anywhere at all times. This dream can only be realized provided there are feasible solutions that are put in place for the next generation of wireless works. Wireless Mesh Networks (WMNs) ... Read more
Energy-aware path selection metric for IEEE 802.11s wireless mesh networking

Author: Mhlanga, Martin M ; Nyandeni, TC ; Olwal, TO ; Ntlatlapa, Ntsibane S ; Adigun, MO Date: Aug 2009 The IEEE 802.11s working group has commenced activities, which would lead to the development of a standard for wireless mesh networks (WMNs). The draft of 802.11s introduces a new path selection metric called airtime link metric. However, ... Read more

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