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Abstract: We investigate the secrecy outage performance of maximal ratio combining (MRC) in cognitive radio networks over Rayleigh fading channels. In a single-input multiple-output wiretap system, we consider a secondary user (SU-TX) that transmits confidential messages to another secondary user (SU-RX) equipped with M (M≥1) antennas where the MRC technique is adopted to improve its received signal-to-noise ratio. Meanwhile, an eavesdropper equipped with N (N≥1) antennas adopts the MRC scheme to overhear the information between SU-TX and SU-RX. SU-TX adopts the underlay strategy to guarantee the service quality of the primary user without spectrum sensing. We derive the closed-form expressions for an exact and asymptotic secrecy outage probability.

This paper investigated the physical layer security in the cognitive radio networks with using maximal ratio combining. The closed-form expressions for the exact and asymptotic secrecy outage probability is derived. Overall, this paper is well written. The idea of this paper is acceptable, and the technical part is solid.

基于最大比合并的认知无线电物理层保密性能分析

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