SPECTRUM SENSING BY USING ENERGY DETECTION TECHNIQUE IN COGNITIVE RADIO NETWORK

Spectrum importance is increasing rapidly in wireless communication technology, due to the usage of spectrum traffic of the spectrum is also increasing. As the spectrum utilization varies from 5% to 85%, more than 70% of the available spectrum is not utilized efficiently. Due to the less availability of spectrum bandwidth is becoming more expensive. For efficient utilization of the spectrum, it is required to determine the spectrum whether it is being used by the primary user or not. Which introduces the concept of cognitive radio. Cognitive radio is referred toas the adoption of radio parameters using the sensed information of the spectrum. Spectrum sensing is the main function of cognitive radio, which enables the user to search for free bands. Which istermed as the spectrum hole and is defined as the frequency band which is free to be used. With high spectral resolution capability the spectrum hole can be utilized by the secondary user. Energy detection spectrum sensing techniqueat different SNR values with different modulation schemes isdiscussed in this paper.