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Increased spectrum efficiency has been demonstrated with the use of cognitive radios, however with increased likelihood of interference to the incumbents of spectrum. Several studies solved the interference problem from the transmitter power control perspective, so as to curtail excessive cognitive interference powers; however, neglecting the effect of secondary terminal mobility. We show by simulation...
In the IEEE 802.22 standard, the spectrum sensing mechanism is identified as a key functionality of a cognitive radio. Due to the channel uncertainty, a single cognitive user, in most cases, can not make a reliable decision and hence collaboration or cooperation of and among multiple users is required. However, when large number of cognitive users are collaborating with each other, the bandwidth requirements...
Cognitive radio has been identified as a potential candidate to increase spectrum utilisation by exploiting spectrum holes on a non-interfering basis. Spectrum sensing is the key functionality to make sure that the cognitive radio is aware and will not disturb the operation of the licensed users. Collaborative spectrum sensing is needed to overcome deleterious channel effects such as fading or the...
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