A Review on: Spectrum Sensing Techniques

Spectrum sensing is an important and sensitive task in cognitive radio since interfering with other users is illegal. One of the main requirements of spectrum sensing is to detect the presence of the primary users as fast as possible. Cognitive radio arises to be a tempting solution to spectral crowding problem by introducing the opportunistic usage of frequency bands that are not occupied by licensed users. Cognitive radio with software-defined radio has been proposed as the means to promote the efficient use of the spectrum by exploiting the existing spectrum holes. The main objective of this paper is to study various spectrum sensing techniques used in cognitive radio to allow access to the secondary user in the case when band of frequency licensed to the main user is free and being wasted at that time. KeywordsSpectrum Sensing, Energy Detection, Spectrum Holes.