Minimizing secrecy outage probability for primary users in cognitive radio networks

This paper considers a cognitive radio network with a set of secondary users (SUs) who share a spectrum band licensed to a primary user (PU). The PU is assumed to be eavesdropped by a set of eavesdroppers and the SUs are required to interfere with the eavesdroppers to gain their transmission opportunities. We aim to minimize the PU secrecy outage probability under the constraints that the minimum SU ergodic transmission rate and the minimum PU secrecy outage probability reduction are satisfied by optimizing SU scheduling and power allocation. Specifically, it is assumed that unscheduled SUs can send artificial noise to further interfere with the eavesdroppers. Simulation results show that the proposed algorithm outperforms the baseline round-robin scheduling scheme and the existing reference algorithm.