Cognitive Radio—the Basics
There are variations of cognitive radio. The first is called Spectral Sensing Cognitive Radio in which only the radio frequency is monitored. Spectral sensing has been applied to TV channels in order to provide more bandwidth for high definition as well as emergency networks. The technique requires more than just detecting the energy in a channel. It requires a series of nodes to exchange information which is why research is moving towards Cognitive Networking.
The four main functions of Cognitive Radio are
1. Spectrum sensing –finding unused spectrum.
2. Spectrum management – finding the best available spectrum to use based on quality of service criteria.
3. Spectrum mobility –allowing for the shift from one frequency to another
4. Spectrum sharing – scheduling and sharing spectrum in a fair manner