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The demand for radio spectrum has increased dramatically with the explosive growth of wireless services and applications. Spectrum has been traditionally allocated by exclusive licensing in order to limit the interference between different wireless systems. This approach has led to a scarcity of unallocated spectrum as evidenced in the radio spectrum allocation charts. The fact that most spectrum is already licensed does not however mean that it is being utilized efficiently. Spectrum measurements show that large portions of spectrum remain under-utilized.
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