  In this paper, we investigate video signal transmission through an FPGA-based
free-space optical (FSO) communication system prototype. We use a channel
emulator that models the turbulence, scintillation, and power attenuation of
the FSO channel and the FPGA-based real-time prototype for processing
transmitted and received video signals. We vary the setup environment of the
channel emulator by changing the amount of turbulence and wind speed. At the
end of the demonstration, we show that through our testbed, even 4K
ultra-high-definition (UHD) resolution video with 60 fps can be successfully
transmitted under high turbulence and wind speed.
