ABSTRACT
Next generation (xG) communication networks go by the names of dynamic spectrum access Networks (DSANs) and cognitive radio (CR) networks. They provide the facility of high bandwidth to users via, heterogeneous wireless architectures and dynamic spectrum access techniques. CR is the significant enabling technology of xG networks. Spectrum sensing is the most important key element in CR. It enables the CR to adapt to its environment by detecting spectrum holes. In CR, the PU has higher priority or legacy rights on the usage of the spectrum. PU receiver in the coverage of the SU transmitter. The spectrum sensing scheme basically employs transmitter detection, involving the determination of the frequency at which the transmitter is operating. Cooperation in spectrum sensing also improves the overall detection sensitivity of a RF sensor network without the requirement for individual nodes to have high detection sensitivity.
