International Journal of Engineering and Technology

Cognitive Radio is an intellectual radio having the ability of recognizing the vacant spectrum to transmit the data to avoid spectrum inefficiently usage problem. Here CR uses the spectrum policies technique, to spot the existence of user in particular frequency band. In this paper, for efficient spectrum sensing operation, a Wavelet and S-Transform based approach for the detection of sub band edges in wide spectrum band where primary users are available. Here the exact occupation of primary users and noise signal is calculated by S-Transform. The simulation result shows the frequency range which was occupied by primary user and its value is calculated by above two methods and plotted.