Improved channel occupancy rate estimation

Lehtomäki, Janne, López-Benítez, Miguel, Umebayashi, Kenta and Juntti, Markku (2015) Improved channel occupancy rate estimation. IEEE Transactions on Communications, 63 (3). pp. 643-654.

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Abstract

Channel occupancy rate (COR) is the fraction of the time that a channel is occupied, i.e., contains signal(s) in addition to noise. Estimation of COR is important, e.g., in cognitive radio systems, which can use this information for intelligently adapting their spectrum use to the operating environment. For COR estimation, both the ability to operate with weak signals (sensitivity) and closeness of the estimate to the true COR value (accuracy) are important. In this paper, an improved COR estimation (iCOR) method is proposed enabling the use of high false alarm probabilities to improve sensitivity without the overestimation usually associated with high false alarm probabilities. The iCOR method is compared with the conventional method in terms of worst-case root-mean-square error (RMSE), which refers to the RMSE for the COR level yielding the maximum RMSE. To fairly compare different COR estimation methods, it is required that the RMSE for strong signals equals a target value and the considered methods are compared by their RMSE for weaker signals. Comprehensive theoretical analysis is performed and both exact results and approximations are derived. Experimental results verify the theoretical analysis and show significant sensitivity gains from the iCOR method (around 5 dB).

Item Type:	Article
Uncontrolled Keywords:	Channel occupancy rate, cognitive radio, duty cycle, energy detector, spectrum utilization, wireless LAN
Depositing User:	Symplectic Admin
Date Deposited:	20 Mar 2015 16:27
Last Modified:	15 Dec 2022 15:31
DOI:	10.1109/TCOMM.2015.2402195
Publisher's Statement :	Copyright (c) 2015 IEEE. Published as Lehtomaki, J.J.; Lopez-Benitez, M.; Umebayashi, K.; Juntti, M., "Improved Channel Occupancy Rate Estimation," Communications, IEEE Transactions on , vol.63, no.3, pp.643,654, March 2015 doi: 10.1109/TCOMM.2015.2402195 .
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/2008424