Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 71, Issue 2, Pages 2181-2186Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2021.3135498
Keywords
Fading channels; Artificial intelligence; Optimization; Radio transmitters; Physical layer security; MISO communication; Eigenvalues and eigenfunctions; Reconfigurable intelligent surface (RIS); double fading; active RIS; secrecy rate; alternating optimization
Categories
Funding
- Fundamental Research Funds for the Central Universities [3102019ZX015]
- National Natural Science Foundation of China [61941118, 61941105, 62171364]
- Innovation Team Research Fund of Shaanxi Province [2019TD-013]
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This study proposes a novel active RIS design to enhance secure wireless transmission. By adjusting the phase shift and amplifying the amplitude of signals, the impact of double fading effect can be effectively relieved, resulting in a significantly higher secrecy performance gain.
Reconfigurable Intelligent Surface (RIS) draws great attentions in academic and industry due to its passive and low power consumption nature, and has currently been used in physical layer security to enhance the secure transmission. However, due to the existence of double fading effect on the reflecting channel link between transmitter and user, RIS helps achieve limited secrecy performance gain compared with the case without RIS. In this correspondence, we propose a novel active RIS design to enhance the secure wireless transmission, where the reflecting elements in RIS not only adjust the phase shift but also amplify the amplitude of signals. To solve the non-convex secrecy rate optimization based on this design, an efficient alternating optimization algorithm is proposed to jointly optimize the beamformer at transmitter and reflecting coefficient matrix at RIS. Simulation results show that with the aid of active RIS design, the impact of double fading effect can be effectively relieved, resulting in a significantly higher secrecy performance gain compared with existing solutions with passive RIS and without RIS design.
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