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Träfflista för sökning "WFRF:(Fisseha T) "

Sökning: WFRF:(Fisseha T)

  • Resultat 1-5 av 5
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1.
  • Bravo, L, et al. (författare)
  • 2021
  • swepub:Mat__t
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2.
  • Tabiri, S, et al. (författare)
  • 2021
  • swepub:Mat__t
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3.
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4.
  • Lysko, Albert A., et al. (författare)
  • First Large TV White Spaces Trial in South Africa : A Brief Overview
  • 2014
  • Ingår i: 2014 6th International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT). - : Institute of Electrical and Electronics Engineers (IEEE). - 9781479952915 ; , s. 407-414
  • Konferensbidrag (refereegranskat)abstract
    • The paper overviews African first of the really large scale trials of television (TV) white space (TVWS) technology and white space devices (WSDs) designed to co-use the frequency spectrum allocated to TV broadcasting. The WSD obtains information about availability of the spectrum in a particular area for a particular period of time from a geolocation spectrum database (GLSD). The GLSD bases its estimations about the availability on stored information about primary users/transmitters in the area, propagation prediction algorithms and local spectrum management regulations. As the overall system is fairly complex and new, extensive testing and trials are required to prove its functionality and compatibility with existing users of the spectrum. Some of the experiences, specifically those from the largest in Africa TVWS trial providing Internet to 10 large schools, held in Tygerberg, South Africa, and conclusions on testing of WSD and use of white space are overviewed.
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5.
  • Masonta, Moshe T., et al. (författare)
  • Adaptive Spectrum Decision Framework for Heterogeneous Dynamic Spectrum Access Networks
  • 2015
  • Ingår i: Proceedings of the 2015 12th IEEE International Conference on Green Innovation for Africon Renaissance (AFRICON). - : Institute of Electrical and Electronics Engineers (IEEE). - 9781479974986
  • Konferensbidrag (refereegranskat)abstract
    • Spectrum decision is the ability of a cognitive radio (CR) system to select the best available spectrum band to satisfy dynamic spectrum access network (DSAN) users' quality of service (QoS) requirements without causing harmful interference to primary users. In order to have reliable spectrum decision, CR nodes or secondary users (SUs) should identify available spectrum bands and from these candidate spectrum, a SU can select channels which are suitable to meet user QoS requirements. This paper proposes an adaptive spectrum decision framework (ASDF) which is a channel allocation scheme that selects suitable channels from a list of available channels based on SU preferred options. The scheme relies on a geo-location spectrum database for identification of available chanels. Key parameters (i.e. available channel bandwidth, time, and power) are extracted from each available spectrum and tagged according to their level in order to build a matrix of available channels. Our ASDF then maps channels with SUs based on channel properties and SU preferred options. Simulation results show that our ASDF is reliable and consistent when it comes to channel selection. Furthermore, our scheme provides efficient bandwidth utilization when compared to the first come first serve channel allocation scheme.
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  • Resultat 1-5 av 5

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