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Duty Cycle (DC) and Channel Occupancy Rate (COR) measurements are important to characterize the availability of white space for cognitive radio systems. To facilitate accurate DC measurements, the authors apply the Localization Algorithm based on Double-thresholding (LAD) with the Adjacent Cluster Combining (ACC). In order to get stable thresholds, the authors propose and apply a modified version of the LAD ACC called the MED-FCME LAD ACC. They show that LAD ACC based approaches can also be used for COR estimation. For even more accurate COR estimation, they propose estimation based on hard decision fusion of the frequency domain decisions. Measurement results confirm the good performance of the proposed approaches.
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