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Dynamic spectrum sharing technique ("Cognitive Radio") where secondary users opportunistically utilize temporarily or locally unused spectrum has emerged as a prime candidate technology to relieve the perceived spectrum shortage. Making a realistic assessment of the amount of spectrum available for secondary services is the objective of the EU FP7 QUASAR project. In the project it is found to be fundamentally difficult to reliably determine which part of the spectrum is available, which leads to large safety margins consequently to poor spectrum utilization.
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