Atmospheric Turbulence Suppression Algorithm Based on APD Adaptive Gain Control for FSO Links of 5G Floating Base Stations

Xiaonan Yu,Yansong Song,Chang Zhou,Lei Xiao,Haifeng Yao,Shuaihe Gao,Tong Wang,Xingchi Chen,Lei Zhang,Shoufeng Tong,Zhiming Jin

doi:10.1109/jphot.2020.3006511

Xiaonan Yu, Yansong Song + Show 9 more

Open Access

https://doi.org/10.1109/jphot.2020.3006511

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Abstract

The data transmission between 5G floating base stations will be an important application area of the free space optical (FSO) link, but the problem of atmospheric disturbance will directly affect the application effect. An atmospheric turbulence suppression algorithm based on avalanche photodiode adaptive gain control (APDAGC) for the laser transmission terminal was proposed to suppress atmospheric turbulence. The given design mechanism and experimental results demonstrate its function to improve the performance of FSO. When APDAGC is over 1 km FSO, the variance of intensity fluctuation is lowered from 0.046 to 0.009, with the bit error rate reduced from 4.82E-6 to 1E-12. Comparatively, as APDAGC is over 6.5 km FSO, the variance of intensity fluctuation is decreased from 1.767 to 0.376, with the bit error rate varying from 4.6E-2 to 2.4E-4. Moreover, it was used for the first FSO transmission of 5G floating base station signals on an airship platform.

Highlights

With the rapid development of the fifth generation mobile communication technology (5G), the main problem is the lack of base stations and the difficulties of site selection
An atmospheric turbulence suppression algorithm based on avalanche photodiode adaptive gain control (APDAGC) for the laser transmission terminal was proposed to suppress atmospheric turbulence
This paper aims to verify the suppression of turbulence-induced light intensity fluctuations via APD gain closed-loop control under weak and strong turbulence condition effect

Summary

Introduction

With the rapid development of the fifth generation mobile communication technology (5G), the main problem is the lack of base stations and the difficulties of site selection. In addition to the shortage of land resources in the city, the operators should consider the cost and feasibility of station distribution in remote areas. The establishment of airship platform-based floating 5G base station can solve the problem of remote areas and sea station distribution, and significantly improve the coverage and accessibility of 5G service [1]. The 5G service has a baseband transmission rate over 1 Gbps and the high-rate optical fiber communication is used in traditional base stations to complete inter-station networking and data interaction. For the floating base station, fiber link cannot be applied and wireless communication technology has become the only option [2]. Compared with RF wireless communication, the wireless free space optical (FSO) communication has the advantages of high communication rate, long communication distance, Vol 12, No 4, August 2020

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