卷:72 | |
Secure Outage Analysis of RIS-Assisted Communications With Discrete Phase Control | |
Article | |
关键词: RECONFIGURABLE INTELLIGENT SURFACES; SECRECY PERFORMANCE ANALYSIS; PHYSICAL-LAYER SECURITY; REFLECTING SURFACE; WIRELESS COMMUNICATION; | |
DOI : 10.1109/TVT.2022.3224967 | |
来源: SCIE |
【 摘 要 】
This correspondence investigates a reconfigurable intelligent surface (RIS)-assisted wireless communication system with security threats. The RIS is deployed to enhance the secrecy outage probability (SOP) of the data sent to a legitimate user. By deriving the distributions of the received signal-to-noise-ratios (SNRs) at the legitimate user and the eavesdropper, we formulate, in a closed-form expression, a tight bound for the SOP under the constraint of discrete phase control at the RIS. The SOP is characterized as a function of the number of antenna elements, $N$, and the number of discrete phase choices, $2<^>{b}$. It is revealed that the performance loss in terms of SOP due to the discrete phase control is ignorable for large $N$ when $b \geq 3$. In addition, we explicitly quantify the SOP loss when binary phase shifts, i.e., $b =1$, are utilized. It is found that increasing the number of RIS elements by 1.6 times provides the same SOP as that of an RIS with continuous-valued phase shifts. Numerical simulations are conducted to verify the accuracy of these theoretical observations.
【 授权许可】
Free