The sensing function is one of the most important features of cognitive radios since a reliable detection of available spectrum ensuring non-interference to licensed users is necessary to initiate a lower priority communication. In this paper, the proposal of a physical layer sensing method using the
multiple-level wavelet decomposition analysis for the detection of primary users is presented. The proposed scheme consists of
four stages (sampling, multiple-level decomposition analysis, coefficients analysis and evaluation criterion), where the energy percentage through the decomposed levels is proposed as a metric to determine if there is a high priority user present on the channel or not. For simulation purposes different input signals involving the presence/absence of a primary user as well as variations in the SNR were considered in order to evaluate the model.
CitationMedina, G.; Delgado-Penín, Josè A. Método de detección de usuarios primarios utilizando una descomposición wavelet. A: Simposium Nacional de la Unión Científica Internacional de Radio. "XXIV Simposium Nacional de la Unión Científica Internacional de Radio". Santander: 2009, p. 1-4.
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