International Journal of Advanced Research in Computer and Communication Engineering (IJARCCE)
The wireless data consumption is increasing rapidly due to increase in number of mobile devices which are connected through air. So there is huge demand for spectrum. Large chunk of spectrum is licensed which are expensive. Unlicensed users are prohibited access to licensed spectrum. To efficiently use the available spectrum and solve the spectrum shortage problem there is need of cognitive radio. Software defined radio is a building block of cognitive radio which is reconfigured according to the available spectrum.