Abstract

There's a signal-noise-ratio(SNR) threshold named "SNR wall"[6] in the energy detection due to the noise power uncertainty. It makes energy detector(ED) almost non-robust in low SNR environment. In this paper, we propose a log-normal distribution model of the noise power uncertainty based on the stochastic properties of the noise uncertainty. The detection performances of the energy detector are analyzed based on the proposed noise model. The numerical results illustrate that not only local but cooperative low SNR EDs are reduced to invalid for a little marked noise power uncertainty.

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