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Secrecy Outage Analysis by Applying Bi-directional Beamforming in Underlay MIMO-CRN

This paper presents the optimal physical-layer security scheme of both primary user (PU) and secondary user (SU) in the underlay multiple-input multiple-output cognitiveradio network (MIMO-CRN) by using bi-directional zero-forcing beamforming technique. The proposed method enables the PU to communicate along with the SU without sacrificing their individual secrecy capacity, i.e., without causing interference to each other in the presence of eavesdropper(s). In this method, a bi-directional beamforming has been applied to eradicate the necessity of involving artificial noise for preventing the active eavesdropper(s). Both theoretical and numerical analyses of the secrecy outage probability are provided to demonstrate the effectiveness of our proposed method. The secrecy outage probability is also derived to evaluate the performance variations of our proposed scheme when the channel-estimation error occurs.