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Cognitive Radio have emerged up as the innovative technology to counter the problem of Spectrum Scarcity and it's under utilization. Using Cognitive Radio unused spectrum bands by their licensed users can be utilized by the secondary users and therefore increase the overall spectrum utilization. In this paper energy detection based Spectrum Sensing Technique is proposed based on M-ary QAM. The proposed techniques works under diverse channel conditions and environments. To test and verify the proposed technique, Receiver Operating Characteristics (ROC) curves for analysing Probability of Detection (Pd) and Complimentary ROC curves for Probability of Missed Detection (Pmd) is performed. The proposed technique is tested over different fading channels with varying Signal to Noise Ratio.

Cognitive Radio Spectrum Sensing Technique Using M-ary QAM for Different Fading Environments