Title: Directional and cooperative spectrum occupancy measurements in the 2.4 GHz ISM band

Authors: Marja Matinmikko; Miia Mustonen; Marko Höyhtyä; Tapio Rauma; Heli Sarvanko; Aarne Mämmelä

Addresses: VTT Technical Research Centre of Finland, Kaitoväylä 1, P.O. Box 1100, FI-90571 Oulu, Finland ' VTT Technical Research Centre of Finland, Kaitoväylä 1, P.O. Box 1100, FI-90571 Oulu, Finland ' VTT Technical Research Centre of Finland, Kaitoväylä 1, P.O. Box 1100, FI-90571 Oulu, Finland ' VTT Technical Research Centre of Finland, Kaitoväylä 1, P.O. Box 1100, FI-90571 Oulu, Finland ' VTT Technical Research Centre of Finland, Kaitoväylä 1, P.O. Box 1100, FI-90571 Oulu, Finland ' VTT Technical Research Centre of Finland, Kaitoväylä 1, P.O. Box 1100, FI-90571 Oulu, Finland

Abstract: This paper presents directional and cooperative spectrum occupancy measurements in the 2.4 GHz industrial, scientific and medical band. Spectrum occupancy characterises the efficiency of spectrum use in terms of identifying the proportion of time that a given frequency channel is occupied. Directional spectrum occupancy measurements are carried out using two separately located measurement devices with directional antennas to capture the influence of the spatial dimension on the spectrum use. The measurements from the different antennas are further combined using decision fusion techniques to get cooperative spectrum occupancies that give a more accurate view of the actual spectrum use. The resulting directional and cooperative spectrum occupancies are valuable input to the development of future cognitive radio systems where unoccupied channels could be accessed opportunistically. The measurements results indicate that the spectrum occupancy can vary significantly in the same office environment depending on the measurement location and direction.

Keywords: adaptive communications; cognitive radio; cooperative spectrum sensing; measurement location; directional spectrum occupancy; WLAN; wireless LANs; local area networks; spectrum usage.

DOI: 10.1504/IJAACS.2014.067239

International Journal of Autonomous and Adaptive Communications Systems, 2014 Vol.7 No.4, pp.339 - 357

Published online: 14 Feb 2015 *

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