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Dynamic spectrum access to the unused licensed spectrum has been proposed as a solution to the spectrum scarcity problem. However, efficient spectrum sensing techniques are crucial on the way towards systems, which use idle spectrum bands opportunistically and increase the overall spectral efficiency. The spectrum occupancy measurement is very important for(More)
Primary user (PU) activity, as a key point in cognitive radio (CR) technologies and wireless communications, has been widely considered in various simulation environments, but still lacking the support of real-time spectrum data. In this paper, by measuring the power spectrum density (PSD) of GSM downlink in four consecutive days, we adopt a dynamic system(More)
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