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Several measurement campaigns have shown that numerous spectrum bands are vacant although licenses have been issued by the regulatory agencies. Dynamic Spectrum Access (DSA) has been proposed in order to alleviate this problem and increase the spectral utilization. In this paper, the authors present the spectrum measurement setup and discuss lessons learned during the measurement activities. They compare measurement results gathered at three locations and show differences in the background noise processes. Additionally, they introduce a new model for the duty cycle distribution that has multiple applications in the DSA research.
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