Cognitive Radio Networks- Spectrum Sensing

Abstract

Cognitive radio plays an important role in wireless communication.The spectrum has become a limited resource by ever increasing demand for wireless communications.For developing of new applications and services the existing spectrum allocation system creating a major problem.Cognitive radios are better solution to the problem of overcrowed and inefficient licensed spectrum.The sensing spectrum is the major key role in cognitive radio to find the free spectrum and favorable circumstances to use the unused frequency bands without causing intervention to the existing primary users(PUs).