Barnes, Simon DanielJansen van Vuuren, P.A.Maharaj, Bodhaswar Tikanath Jugpershad2013-10-152013-10-152013Barnes, SD, Jansen Van Vuuren, PA & Maharaj, BTJ 2013, 'Spectrum occupancy investigation : measurements in South Africa', Measurement, vol. 46, no. 9, pp. 3098-3112.0263-2241 (print)1873-412X (online)10.1016/j.measurement.2013.06.010http://hdl.handle.net/2263/32064Regulatory bodies have predicted an impending shortage in commercial radio frequency spectrum in the near future. However, due to outdated regulatory practices, many of these bands are in fact inefficiently underutilised. Spectrum measurement campaigns have be carried out around the world to determine the extent to which this is true. However, there still seems to be a lack of knowledge regarding spectrum occupancy in South Africa. A spectrum measurement system was thus designed and employed to measure the spectrum occupancy of the ultra-high frequency (UHF), global system for mobile communications (GSM) 900 MHz and GSM 1800 MHz bands through a measurement campaign in the Hatfield area of Pretoria, South Africa. A method for determining spectrum occupancy, from raw spectrum measurements, has been described and used to calculate the average spectrum occupancy of these bands. Occupancy in the UHF band was found to be fairly constant at approximately only 20%. While the maximum occupancy of the GSM 900 MHz band was calculated to be much higher at approximately 92% and that of the GSM 1800 band to be approximately 40%. However, the GSM 900 MHz and 1800 MHz bands did exhibit fluctuations in occupancy of between 10% and 20% respectively according to the time of day. Slight variations in occupancy of between 1% and 3% were also evident over the days of the week. These results are placed into context by a comparison with the findings of various other measurement campaigns from around the world. When compared, occupancy was generally found to be lower in the UHF bands but higher in the mobile bands.en© 2013 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Measurement changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Measurement, vol. 46, no. 9, 2013, doi : 10.1016/j.measurement.2013.06.010Noise floorSpectrum measurementsSpectrum occupancyThreshold detectionCognitive radio networks -- South AfricaShortwave radio -- South AfricaGlobal system for mobile communications -- South AfricaRadio frequencyRadiofrequency spectroscopyPostprint Article