International Journal of Electrical, Electronics and Computer Engineering (IJEECE)
The demand for high data rates in wireless communication systems is increasing as well the demand for new (communication) services. Expanding of existing services or introducing new services needs a portion in the radio spectrum. Mean while the radio spectrum is a scarce resource and is regulated by governmental regulations and policies. In cognitive radio systems, spectrum sensing plays a key role to determine the free frequency bands. However, when the primary user signals spectrum exhibits localized fading, PU detection cannot be guaranteed.