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Cognitive radio allows unlicensed users to access licensed frequency bandsthrough dynamic spectrum access so as to reduce spectrum scarcity. Thisrequires intelligent spectrum sensing techniques. This paper investigates theuse of cyclo-stationary detector and performance evaluation for Digital VideoBroadcast-Terrestrial (DVB-T) signals. Generally, DVB-T is specified in IEEE802.22 standard in VHF and UHF TV broadcasting spectrum. Simulations resultsshow that implementing co-operative spectrum sensing help in better utilizationof resources. The paper further proposes to find number of optimal users in ascenario to optimize the detection probability and makes use of the particleswarm optimization (PSO) technique to find an optimum value of threshold.

Optimal number of users in Co-operative spectrum sensing in WRAN using Cyclo-Stationary Detector