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• W3138094384 abstract "By the integration of cooperative cognitive radio (CR) and nonorthogonal multiple access (NOMA), cooperative CR NOMA networks can improve the spectrum efficiency of wireless networks significantly. Due to the openness and exposure of wireless signals, secure communication is an important issue for cooperative CR NOMA networks. In this paper, we investigate the physical layer security design for cooperative CR NOMA networks. Our objective is to achieve maximum secrecy rate of the secondary user by designing optimal beamformers and artificial noise covariance matrix at the multiantenna secondary transmitter under the quality-of-service at the primary user and the transmit power constraint at the secondary transmitter. We consider the practical case that the channel state information (CSI) of the eavesdropper is imperfect, and we model the imperfect CSI by the worst-case model. We show that the robust secrecy rate maximization problem can be transformed to a series of semidefinite programmings based on S-procedure and rank-one relaxation. We also propose an effective method to recover the optimal rank-one solution. Simulations are provided to show the effectiveness of our proposed robust secure algorithm with comparison to the nonrobust secure design and traditional orthogonal multiple access schemes." @default.
• W3138094384 created "2021-03-29" @default.
• W3138094384 creator A5003101676 @default.
• W3138094384 creator A5029717787 @default.
• W3138094384 date "2021-03-18" @default.
• W3138094384 modified "2023-10-16" @default.
• W3138094384 title "Robust Secure Beamforming Design for Cooperative Cognitive Radio Nonorthogonal Multiple Access Networks" @default.
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• W3138094384 doi "https://doi.org/10.1155/2021/5526485" @default.
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