关键词: 认知无线电网络, 物理层安全, 非正交多址, 信息安全, 资源分配

Abstract: A physical layer security scheme for CRNOMA systems based on DC(difference of convex) function planning is proposed to address the communication security issues caused by the openness of CRNOMA systems. In the NOMA(nonorthogonal multiple access) communication scenario, construct a multiuser eavesdropping channel model derive the security and rate expressions for the CRNOMA system; And design a DCbased carrier power allocation algorithm to solve the optimal solution for subchannel power allocation and improve the security of system subcarriers. The simulation results show that without increasing the power of the base station, its SSR is improved by 35% and 10%, respectively, compared to OFDMA and NOMA; Under the same SSR, the maximum number of users can increase by 200%. Verified that the scheme can effectively enhance the physical layer security of the system.

Key words: cognitive radio networks, physical layer security, nonorthogonal multiple access, information security, resource allocation