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Wavelet Radio by Homayoun Nikookar

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6 Wavelets for spectrum sensing in cognitive radio applications

6.1 Background

Cognitive radio (CR) is an emerging technology for the strategic utilization of the radio spectrum, one of the most valuable resources for any wireless application. Fast and accurate sensing of the radio spectrum used for wireless applications is one of the key requirements of any cognitive radio architecture. From the survey of all traditional and recently developed spectrum sensing methodologies, it is observed that a low complexity reconfigurable spectrum estimator with the property of a flexible time–frequency resolution is desirable. A recently developed technique for the detection of active users or spectrum holes in the spectral domain is the wavelet-packet-based ...

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