In this letter, we analyze the problem of detecting spectrum holes in cognitive radio systems. We consider that a group of unlicensed users can sense the radio signal energy, perform some simple processing and transmit the result to a central entity, where the decision about the presence or not of licensed users is made. We show that the proposed cooperative schemes present good performances ev...

Cognitive radio is one of the main technologies in the wireless communications. The cognitive radio networks are composed of cognitive, spectrum-agile devices which is able to modify their network configurations according to the spectral environment. This cognitive radio provides the chance reusing portions of the spectrum temporarily for the secondary users. But security is a main issue in the...

w w w . i j e c t . o r g 240 InternatIonal Journal of electronIcs & communIcatIon technology Abstract Spectrum sensing has reborn as a very active research area over recent years. As it is one of the most important task performed by cognitive radio and the performance of the other functions of cognitive radio is based on the spectrum sensing. So it is very necessary for cognitive radio to perf...