| Summary: | Millimeter wave (mmWave) and non-orthogonal multiple access (NOMA) are two key technologies for future wireless networks. In this paper, secure communication in mmWave NOMA networks based on cognitive power allocation scheme is studied by preferentially satisfying the quality of service (QoS) of primary user. Considering directional beamforming, a corresponding sector guard zone is invoked to against the random distributed eavesdroppers. We give a comprehensive investigation of secrecy performance through stochastic geometry in terms of connection outage probability (COP), secrecy outage probability (SOP), and secrecy throughput (ST). The simulation results validate our derivations and show that the secondary user in NOMA schemes can obtain better connection performance than that in orthogonal multiple access (OMA) schemes, while the primary user achieves the same connection performance in NOMA and OMA schemes. In addition, when the system parameters are reasonable set, the secondary user in NOMA schemes can achieve a higher ST than that in OMA. Moreover, blockages can be also utilized to improve secrecy performance on some occasions.
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