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Spectrum sensing is used to identify the (temporarily) unused (licensed) frequency bands and as such plays a key role in dynamic spectrum access. Spectrum sensing is currently being investigated by a number of researchers. In this paper, the authors compare the performance of three classes of algorithms - energy detectors, autocorrelation detectors, and the cyclic autocorrelation detector. The focus of the study is on the trade-offs of the three approaches under fixed false alarm and detection probabilities.
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