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In the second case, we can no longer use the fact that the optimal power allocation is uniform over the allocated spectrum, so we cannot even simplify the problem as the symmetric case.
In a static spectrum allocation, the devices can easily detect the activities in their allocated spectrum bands using some existing technique such as energy detection [10], matched filters [11], etc. Unfortunately in cognitive networks, the allocated spectrum to the base stations (BSs) changes dynamically over time and space.
By utilizing the allocated spectrum, cognitive radio devices can provide high throughput and low latency communications.
These auctions were multiple related goods are sold in the same auction are for example used to allocated spectrum to cellular companies around the world.
MeNB uses the allocated spectrum for itself.
The allocated spectrum becomes very crowded and spectrum scarcity comes.
PUs occupy their allocated spectrum only 30% on average.
To detect spectrum holes, unlicensed wireless devices are sensing constantly the allocated spectrum channel.
According to the Federal Communication Commission [1], most of the allocated spectrum remains underutilized most of the time.
However, measurement campaigns have shown that most of the allocated spectrum bands are underutilized [1].
At the same time, the most allocated spectrum is under-utilized [1].
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