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An underlay cognitive radio unit over Nakagami- $m$ fading channel, which consists of a source $S$, a secondary user (SU), and an eavesdropper who wants to eavesdrop the information between $S$ and SU, is considered. The transmit power of $S$ is simultaneously adjusted according to the channel state information of $S$–PU link and a given threshold interference power that the primary user can...
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