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Comparison of Energy Detection Based Spectrum Sensing Methods over Fading Channels in Cognitive Radio

Author(s): Komal Arora | Ankush Kansal | Kulbir Singh

Journal: Signal Processing : An International Journal
ISSN 1985-2339

Volume: 5;
Issue: 2;
Start page: 44;
Date: 2011;
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Keywords: Cognitive Radio | Spectrum Sensing | Probability of Detection.

With the advance of wireless communications, the problem of bandwidth scarcity has become moreprominent. Cognitive radio technology has come out as a way to solve this problem by allowing theunlicensed users to use the licensed bands opportunistically. To sense the existence of licensedusers, many spectrum sensing techniques have been devised. This paper presents the energydetection based spectrum sensing technique. In the present work, the comparison of ROC curves hasbeen done for various wireless fading channels using squaring and cubing operation. The cubingoperation shows an improvement of up to 0.6 times as compared to the squaring operation for AWGNchannel. For Rayleigh channel, the improvement achieved is up to 0.4 times as we move fromsquaring to cubing operation in an energy detector.

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