Experimental demonstration of a free space optical wireless video transmission system based on image compression...

Area of Science:

• Optical Engineering
• Signal Processing
• Wireless Communications

Background:

• Wireless video transmission faces challenges with massive data volumes and maintaining image quality.
• Existing methods struggle to balance data reduction, transmission rate, and signal fidelity.

Purpose of the Study:

• To propose and evaluate a free-space optical video transmission system utilizing compressed sensing (CS) algorithms.
• To enhance data compression and transmission quality in wireless optical communication.

Main Methods:

• Hardware design of an optical wireless video transceiver board using Artix-7 FPGA.
• Online transmission of compressed sensing (CS) images via Gigabit Ethernet to FPGA for encoding.
• Simulation of atmospheric turbulence channel and optical signal transmission and decoding.

Main Results:

• The encrypt-then-compress (ETC) algorithm demonstrated optimal performance in image compression, transmission, and reconstruction.
• The 2D compressed sensing (2DCS) algorithm showed superior effectiveness.
• Reconstructed images achieved 3-7 dB higher PSNR than comparison algorithms under sufficient optical power.
• Peak Signal-to-Noise Ratio (PSNR) exceeded 30 dB in strong atmospheric turbulence, ensuring complete image reconstruction.

Conclusions:

• The developed free-space optical system with CS algorithms effectively addresses wireless video transmission challenges.
• The system provides robust and high-quality image reconstruction, even under adverse atmospheric conditions.