Investigations on cognitive radio network functions through intelligent algorithms

Abstract

newline Exponential growth in wireless networks has resulted in huge demand newlinefor the radio spectrum resources. However, studies on spectrum show that newlinesignificant portions of spectrum resource are highly underutilized. The survey newlineof spectrum usage by FCC [Federal Communications Commission] indicates newlinethat spectrum utilization ranges from 15% to 85% under fixed spectrum newlineallocation policy. The spectrum utilization is mainly around certain parts of newlinethe spectrum whereas a considerable amount of the spectrum is unutilized. newlineTo use the spectrum more efficiently, the Cognitive Radio (CR) newlineconcept has been proposed by Joseph Mitola. Cognitive Radio is a smart radio newlinethat can sense the external electromagnetic environment and can adapt its newlinetransmission parameters according to the current state of the environment. newlineThis observation created new insight in spectrum allotment, called newlineOpportunistic Spectrum Access (OSA). This has necessitated this new newlinecommunication standard that allows unlicensed (secondary) users to utilize newlinethe vacant bands which are allocated to licensed (primary) users. newline