Provided by: shahi.nishiy
Date Added: Jun 2012
Cognitive Radio (CR) technology has been recommended as a key solution to the problem of inefficient use of the allocated spectrum to primary licensed users. This technology allows unlicensed or Secondary Users (SU) to access spectrum bands allocated to licensed or Primary Users (PU) while the interference imposed on the PU signal remains below a given threshold. To this end, CR users have to sense the spectrum constantly in order to detect the presence of a Primary Transmitter Signal (PTS). So, spectrum sensing is one of the most important issues in the implementation of each CR network. Due to channel fading conditions and the well-known hidden terminal problem, spectrum sensing is usually imperfect and imposes interference on the primary network.