Abstract
Free-space optical (FSO) communication, considered as a last-mile technology, is widely used in many urban scenarios. However, the performance of urban free-space optical (UFSO) communication systems fades in the presence of system vibration caused by many factors in the chaotic urban environment. In this paper, we develop a dedicated indoor vibration platform and atmospheric turbulence to estimate the Bifurcated-Gaussian (B-G) distribution model of the receiver optical power under different vibration levels and link distances using nonlinear iteration method. Mean square error (MSE) and coefficient of determination ( $R^2$ ) metrics have been used to show a good agreement between the PDFs of the experimental data with the resulting B-G distribution model. Besides, the UFSO channel under the effects of both vibration and atmospheric turbulence is also explored under three atmospheric turbulence conditions. Our proposed B-G distribution model describes the vibrating UFSO channels properly and can easily help to perform and evaluate the link performance of UFSO systems, e.g., bit-error-rate (BER), outage probability. Furthermore, this work paves the way for constructing completed auxiliary control subsystems for robust UFSO links and contributes to more extensive optical communication scenarios, such as underwater optical communication, etc.
Highlights
Over the last two decades, free-space optical (FSO) communication has proliferated in urban network constructions, due to the large unlicensed bandwidth (30 pHz) and high data rate (Gbit/s) compared to the conventional radio frequency (RF) communication [1], [2]
Based on the different network ranges, Free-space optical (FSO) networks can be classified into three types: (i) optical wireless satellite networks (OWSNs), (ii) optical wireless terrestrial networks (OWTNs) (including urban free-space optical (UFSO) communication), and (iii) optical wireless home networks (OWHNs) [4]
We propose for the first time a Bifurcated-Gaussian (B-G) model to describe the vibrating UFSO channels based on the measured experimental data
Summary
Over the last two decades, free-space optical (FSO) communication has proliferated in urban network constructions, due to the large unlicensed bandwidth (30 pHz) and high data rate (Gbit/s) compared to the conventional radio frequency (RF) communication [1], [2]. Usually caused by various atmospheric turbulence, arising from the refractive index fluctuation in the air due to the change of weather conditions, such as rain, snow, fog, etc These variations in the refractive index along the propagation path translate into the optical beam wandering and the fluctuation of the received optical intensity, degrade the performance of UFSO communication systems [8]. There are works like [12], [13], which focus on UFSO channel characterization and experimental validation in a coastal environment All of these proposed models help to analyze the turbulent UFSO channels and find a proper way to decrease the influence from atmospheric turbulence. We propose for the first time a Bifurcated-Gaussian (B-G) model to describe the vibrating UFSO channels based on the measured experimental data.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
