Reconfigurable Intelligent Surfaces-aided Physical Layer Secure Transmission in Non-Orthogonal Multi-Access Systems Against Full-duplex Active Eavesdropping
Reconfigurable Intelligent Surfaces-aided Physical Layer Secure Transmission in Non-Orthogonal Multi-Access Systems Against Full-duplex Active Eavesdropping
Considering the multi-user Non-Orthogonal Multi-Access(NOMA) system under the full-duplex attack of passive eaves-dropping and active interference at the same time, a robust beamforming scheme based on Reconfigurable Intelligent Surfaces (RIS) is proposed to realize physical layer secure communication. Under the condition that only the channel state information of the eavesdropper is known, the system transmission interruption probability and the confidential interruption probability are taken as the constraints and the system confidentiality rate is maximized by jointly optimizing the base station transmission beamforming, RIS phase shift matrix, transmission rate and redundancy rate. In order to solve the above multivariate coupling non-convex optimization problem, an effective alternating optimization algorithm is proposed to obtain the suboptimal solution of the joint optimization problem. The simulation results show that the proposed scheme can achieve a higher confidentiality rate, and when the number of RIS reflective elements is increased, the system confidentiality performance gets better.
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