The Analysis of Closed-form Solution for Energy Detector Dynamic Threshold Adaptation in Cognitive Radio

R. Bozovic, M. Simic, P. Pejovic, M. L. Dukic

The Analysis of Closed-form Solution for Energy Detector Dynamic Threshold Adaptation in Cognitive Radio

Číslo: 4/2017
Periodikum: Radioengineering Journal
DOI: 10.13164/re.2017.1104

Klíčová slova: Cognitive radio, energy detector, noise variance estimation, spectrum sensing, threshold adaptation, Kognitivní rádio, detektor energie, odhad odchylek hluku, snímání spektra, prahová adaptace

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Anotace: Spectrum sensing is the most important process in cognitive radio in order to ensure interference avoidance to primary users. For optimal performance of cognitive radio, it is substantial to monitor and promptly react to dynamic changes in its operating environment. In this paper, energy detector based spectrum sensing is considered. Under the assumption that detected signal can be modelled according to an autoregressive model, noise variance is estimated from that noisy signal, as well as primary user signal power. A closed-form solution for optimal decision threshold in dynamic electromagnetic environment is proposed and analyzed.