A comprehensive Study on spectrum sensing and resource allocation for cognitive cellular network

The wireless communication system are facing the spectrum shortage and interference problem for the latest developments in the cellular industry. These problems can be solved by using a new technology known as Cognitive Radio Network (CRN) where dynamic utilization of spectrum takes place. Cognitive Radio is an intelligent transceiver system that continuously monitors its radio environment in search of the unused frequency slots (known as spectrum holes) which can be seen in the environment, analyze and take decisions from threshold. This frequency slots are used up by secondary user in the absence of primary user. In this paper, we have analyzed four different types of spectrum sensing techniques, challenges faced by spectrum sensing method and strategies to solve this problem.