The amplify-and-forward(AF)relay is widely employed owing to its simplicity,while reconfig-urable intelligent surface(RIS)technology is envisioned as the next generation of relay technology due to its high energy effi...The amplify-and-forward(AF)relay is widely employed owing to its simplicity,while reconfig-urable intelligent surface(RIS)technology is envisioned as the next generation of relay technology due to its high energy efficiency.This paper compares these two technologies at the physical layer security(PLS)level for non-orthogonal multiple access(NOMA)with an internal near-end eavesdropper.Specifically,for a fair comparison,both the number of RIS elements and AF relay antennas are set to N,and similar secure transport strategies are utilized for both models to maximize the secrecy rate.Analytical results demonstrate that the PLS performance of RIS-assisted NOMA is better than that of AF relay-assisted NOMA if N reaches a certain threshold.Simulation results verify the correctness of the theoretical analysis.展开更多
基金supported by the Fundamental Research Funds for the Central Universities,the Innovation Fund of Xidian University,the China National Key R&D Program(2021YFA1000500 and 2023YFB2904804)National Natural Science Foundation of China(62331023,62101492,62394292 and U20A20158)the Youth Innovation Team of Shaanxi Universities,the Double First-Class Overseas Research Scholarship Fund of Xidian University。
文摘The amplify-and-forward(AF)relay is widely employed owing to its simplicity,while reconfig-urable intelligent surface(RIS)technology is envisioned as the next generation of relay technology due to its high energy efficiency.This paper compares these two technologies at the physical layer security(PLS)level for non-orthogonal multiple access(NOMA)with an internal near-end eavesdropper.Specifically,for a fair comparison,both the number of RIS elements and AF relay antennas are set to N,and similar secure transport strategies are utilized for both models to maximize the secrecy rate.Analytical results demonstrate that the PLS performance of RIS-assisted NOMA is better than that of AF relay-assisted NOMA if N reaches a certain threshold.Simulation results verify the correctness of the theoretical analysis.
