Rex van Olst
University of the Witwatersrand
24 Papers
85 Citations
Rex van Olst is an academic researcher from University of the Witwatersrand. The author has contributed to research in topics: Cognitive radio & Wireless. The author has an hindex of 6, co-authored 24 publications.
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Papers
Application of neural network for sensing primary radio signals in a cognitive radio environment
Jide Julius Popoola,Rex van Olst +1 more
- 10 Nov 2011
TL;DR: Different sensing methods for detecting primary users' signals are reviewed before proposing automatic modulation classification detection's method for sensing the presence/absence of licensed users, which promises better performance than other detection methods.
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Effect of training algorithms on performance of a developed automatic modulation classification using artificial neural network
Jide Julius Popoola,Rex van Olst +1 more
- 01 Sep 2013
TL;DR: The overall performance evaluation of the classifier using the two training algorithms shows that the developed classifier could successfully classify the eight modulated schemes considered with an average success rate above 97.0% irrespective of the signal-to-noise value.
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Effect of tunnel geometry and antenna parameters on through-the-air communication systems in underground mines: Survey and open research areas
TL;DR: The effect of tunnel geometry and antenna parameters on TTA communication system performance in underground mines is surveyed and a comprehensive review of measurement campaigns that have been published to date by systematic organization of literature is provided.
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Automatic classification of combined analog and digital modulation schemes using feedforward neural network
Jide Julius Popoola,Rex van Olst +1 more
- 10 Nov 2011
TL;DR: An artificial neural network based automatic modulation classifier system which can be used to classify combined analog and digital modulation schemes and is accurate and sensitive to classification of the nine modulation schemes considered with an average success rate above 99.0%.
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Narrowband PLC channel modeling using USRP and PSK modulations
Ayokunle Damilola Familua,K. Ogunyanda,Theo G. Swart,Hendrik C. Ferreira,Rex van Olst,Ling Cheng +5 more
- 12 May 2014
TL;DR: A First-order Markov modeling of NB-PLC channel noise is reported, based on experimental measurements, which are useful for improving the robustness of the above modulation schemes as well as designing forward error correction techniques for mitigating the effect of noise impairments.
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