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Published in:
2010 | OriginalPaper | Chapter
Noise Uncertainty Study of the Low SNR Energy Detector in Cognitive Radio
Authors : Guoqing Ji, Hongbo Zhu
Published in: Artificial Intelligence and Computational Intelligence
Publisher: Springer Berlin Heidelberg
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It’s well known that a signal-noise-ratio(SNR) threshold named ”SNR wall” [5] appears in the energy detection due to the noise uncertainty. It makes energy detector(ED) highly non-robust in low SNR environment. In this paper, a log-normal distribution model of the noise power uncertainty is proposed. The detection performances of the energy detector are analyzed based on the proposed noise model. The numerical results illustrate that not only local but also cooperative low SNR Eds are reduced to invalid for a biggish noise power uncertainty.