Spectrum Sensing for Cognitive Radio Users using Constant Threshold Range in Energy Detector

Abstract Spectrum Sensing has an important role in Cognitive Radio Network (CRN). Different methodologies have been proposed in the literature for spectrum sensing. Energy detector method is more practical and less in complexity. This paper presents analysis of energy detection algorithm in different scenarios with different parameters to detect presence or absence of Primary User (PU). The energy detection threshold has been used as Constant Threshold Range (CTR) to reduce the trade-off between Probability of False Alarm Pfa and Probability of miss detection Pmd. The Receiver Operating Curves (ROC) has been presented by simulating Spectrum Sensing scenarios under fading and non-fading environments. It is also shown that theses curves can be further improved by Cooperative Spectrum Sensing (CSS) technique. The hardware implementation has also been presented by receiving real time signals using Universal Software Radio Peripheral (USRP) and GNU Radio, which has verified the simulated results