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Abstract
The rise of needs of the people has made researchers to look for the solution which can fulfil the demands of the people. The report of FCC had claimed the overcrowded of the spectrum but most of time the spectrum is unused. The spectrum is not utilised and it is wasted. The licensed user is called Primary User (PU) and Secondary Users (SU) which are also called as Cognitive Users (CU) are the unlicensed users. The first step for Cognitive Radio (CR) is sensing where the available spectrum hole has to be identified. In the present study, all types of sensing methods and comparison between them based on different parameters is done. Also the problem faced during the sensing of the spectrum has been studied.