Analysis of Physical Layer Security Performance of RIS-assisted Mixed RF/FSO System

ZHAO Hui; WAN Hui; LI Jing; MA Weiwen

doi:10.13756/j.gtxyj.2024.220056

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Analysis of Physical Layer Security Performance of RIS-assisted Mixed RF/FSO System

更新时间：2024-04-02

- Analysis of Physical Layer Security Performance of RIS-assisted Mixed RF/FSO System
- Study on Optical Communications Issue 2, Pages: 22005601-22005609(2024)
- 作者机构：
  
  重庆邮电大学　通信与信息工程学院，重庆　400065
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2024.220056
  CLC： TN929.1
- Published：10 April 2024，
  
  Received：26 January 2023，
  
  Revised：04 February 2023，
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赵辉，万辉，李静，等.RIS辅助的混合RF/FSO系统物理层安全性能分析[J].光通信研究，2024(2):220056.

Zhao H, Wan H, Li J, et al.Analysis of Physical Layer Security Performance of RIS-assisted Mixed RF/FSO System[J]. Study on Optical Communications, 2024(2):220056.
赵辉，万辉，李静，等.RIS辅助的混合RF/FSO系统物理层安全性能分析[J].光通信研究，2024(2):220056. DOI： 10.13756/j.gtxyj.2024.220056.

Zhao H, Wan H, Li J, et al.Analysis of Physical Layer Security Performance of RIS-assisted Mixed RF/FSO System[J]. Study on Optical Communications, 2024(2):220056. DOI： 10.13756/j.gtxyj.2024.220056.

摘要

【目的】

针对自由空间光（FSO）链路和射频（RF）链路的保密信息容易被外部窃听者窃听的问题，为提升混合RF/FSO通信系统的保密性能，同时考虑到实际工程中FSO链路往往无法满足视距条件且不同天线分支之间会由于收发模块小型化产生相关性，需要对可重构智能表面（RIS）辅助的混合RF/FSO系统的安全性能进行研究，以得到系统安全性能与RIS部署位置和天线相关性程度等参数的关系。

【方法】

文章考虑单个窃听者，分别针对RF和FSO链路进行窃听，RF链路服从任意相关的Nakagami-m分布，FSO链路服从Gamma-Gamma分布。采用解码转发协议，推导得到了两种窃听场景下通信系统的安全中断概率（SOP）和严格正安全容量概率（SPSC）的闭合表达式，并对SOP进行了渐近分析。此外还利用Matlab软件进行了仿真实验，通过蒙特卡洛仿真来验证所推导公式的准确性。

【结果】

仿真结果表明，将RIS部署在靠近接收端的位置可以降低系统的SOP，RF主信道的信道质量与窃听信道相比较好时，天线相关性程度的增加会使系统的SOP上升。

【结论】

RIS辅助的FSO链路相比RF链路具有更好的安全性，虽然多天线分集技术能够有效提高系统的安全性能，但是类似指向误差和大气湍流引起的衰落，天线相关性也会对系统的安全性能造成损害，通过降低天线相关性程度能有效提升系统的安全性。

Abstract

【Objective】

In order to improve the confidentiality and performance of the mixed Radio Frequency (RF)/Free Space Optical (FSO) communication systems

it is necessary to study the security performance of the Reconfigurable Intelligent Surface (RIS)-assisted mixed RF/FSO system to obtain the relationship between system security performance and parameters such as RIS deployment location and the degree of correlation between different antennas branches.

【Methods】

In the article

a single eavesdropper is considered to eavesdrop against RF links and FSO links respectively

with RF links obeying an arbitrarily correlated Nakagami-m distribution and FSO links obeying a Gamma-Gamma distribution. Closed expressions for the Security Outage Probability (SOP) and Strictly Positive Security Capacity (SPSC) probability of the communication system for the two eavesdropping scenarios are derived using the decode-and-forward protocol

and the SOP is analyzed asymptotically. Simulation experiments are also conducted using the Matlab software to verify the accuracy of the derived formulas through Monte Carlo simulation.

【Results】

Simulation results show that deploying the RIS close to the receiver reduces the security outage probability of the system. It is also shown that an increase in the degree of antenna correlation increases the SOP of the system when the channel quality of the RF main channel is better compared to the eavesdropping channel.

【Conclusion】

The RIS-assisted FSO link has better security compared to the RF link. Although the multi-antenna diversity technique can effectively improve the security performance of the system

antenna correlation

similar to the fading caused by pointing error and atmospheric turbulence

can also damage the security performance of the system. It is also shown that the security of the system can be effectively improved by reducing the degree of antenna correlation.

关键词

光通信混合射频/自由空间光通信系统可重构智能表面天线相关性物理层安全

Keywords

optical communicationsmixed RF/FSO communication systemRISantenna correlationphysical layer security

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