Performance Analysis of RIS-Assisted Mixed Dual-Hop FSO-RF Communication Systems over Exponentiated Weibull Channels

Xinzhong Liu,Wenwu Xie,Xin Peng,Jian Zou,Chunlai Li,Zhe-Li Liu

doi:10.1155/2021/9273373

Abstract

Information security is the basis of economic development, information construction, and the protection of people’s and national interest. In this paper, the performance of reconfigurable intelligent surface (RIS)-assisted mixed dual-hop free-space optical-radio frequency (FSO-RF) communication systems is studied and analyzed to ensure the safe transmission of information. In this scheme, it is assumed that the atmospheric turbulence in the fading of the FSO channel follows the exponentiated Weibull distribution model and the fading of the RF channel follows the Rayleigh distribution model. Based on the mathematical function, the probability density function and cumulative distribution function of RIS-assisted mixed dual-hop FSO-RF communication systems are derived. Then, the expression of outage probability and the bit error rate of the system are derived from the channel statistics. Finally, the analysis results are verified by Monte Carlo simulation, and the effects of different parameters on the system performance are analyzed. The simulation results show that the atmospheric turbulence parameters, channel distance of FSO, intensity of atmospheric turbulence, and number of reflectors all affect the system performance.

Highlights

Introduction e rapid development ofInternet and Internet of ings brings remarkable challenges to information security
For an enterprise scenario, signals are transmitted through the mixed dual-hop free-space opticalradio frequency (FSO-radio frequency (RF)) system and reflected to the target users by reconfigurable intelligent surface (RIS). en, we investigate the performance of a mixed dual-hop free-space optical (FSO)-RF system based on RIS technology
In the relay system model designed by us, the bit error ratePE1 generated in the FSO link and the bit error rate PE2 generated in the RF link are mainly considered

Summary

System Model

In this scheme, it is assumed that the atmospheric turbulence in the fading of the FSO channel follows the EW distribution model and the fading of the RF channel follows the Rayleigh distribution model. In the Kim model, the atmospheric attenuation constant is defined as ς (13/V) (2 × 107 × λ/11)ψ(V), where λ represents the wavelength of light, V represents the visible distance, and ψ(V) is a function of visibility given in [21]. Under the assumptions of atmospheric turbulence, pointing error, and path loss, the PDF of cSR is given by fcSR(c).

System Performance Analysis

Numerical Results

Conclusion