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Adaptive Energy Detection for Spectrum Sensing in Cognitive Radio  

Lim, Chang-Heon (Pukyong National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.47, no.8, 2010 , pp. 42-46 More about this Journal
Abstract
Energy detection based spectrum sensing compares the energy of a received signal from a primary user with a detection threshold and decides whether it is active or not in the frequency band of interest. Here the detection threshold depends on not only a target false alarm probability but also the level of the noise energy in the band. So, if the noise energy changes, the detection threshold must be adjusted accordingly to maintain the given false alarm probability. Most previous works on energy detection for spectrum sensing are based on the assumption that noise energy is known a priori. In this paper, we present a new energy detection scheme updating its detection threshold under the assumption that the noise is white, and analyze its detection performance. Analytic results show that the proposed scheme can maintain a target false alarm rate without regard to the noise energy level and its spectrum sensing performance gets better as the time bandwidth product of the signal used to estimate the noise energy increases.
Keywords
cognitive radio; spectrum sensing; energy detection; adaptive detection; CFAR;
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1 V. K. Rohatgi, An introduction to Probability Theory and Mathematical Statistics, John Wiley & Sons, Inc., 1976.
2 J. Mitola and G. Q. Maguire, "Cognitive radio: making software radios more personal," IEEE Pers. Commun., vol.6, no.4, pp.13-18, Aug 1999.   DOI   ScienceOn
3 T. Yucek and H. Arslan, "A survey of spectrum sensing algorithms for cognitive radio applications," IEEE Comms. Surveys, vol.11, no.1, pp.116-130. 2009.
4 R. Tandra and A. Sahai, "SNR Walls for Signal Detection," IEEE J. Sel. Areas Commun., vol.2, no.1, pp.4-17, Feb. 2008.
5 D. Chen, J. Li and J. Ma, "Cooperative Spectrum Sensing under Noise Uncertainty in Cognitive Radio," International Conference on Wireless Communications, Networking and Mobile Computing, pp.1-4, Oct. 2008.
6 C. Song, Y. D. Alemseged, H. N. Tran, G. Villardi, C. Sun, S. Filin, and H. Harada,, "Adaptive Two Thresholds Based Energy Detection For Cooperative Spectrum Sensing," Consumer Communications and Networking Conference, pp.1-6, Jan. 2010.
7 X. Y. Hou, N. Morinaga, and T. Namekawa, "Direct Evaluation of Radar Detection Probabilities," IEEE Trans. Aerosp. Electron. Syst., vol. 23, no. 4, pp. 418-424, July 1987.
8 H. Urkowitz, "Energy Detection of Unknown Deterministic Signals," Proceedings of the IEEE, vol. 55, no. 4, pp. 523-532, April 1967.
9 A. D. Whalen, Detection of Signals in Noise, Academic Press, Inc., 1971.