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High-Throughput Visual MIMO Systems for Screen-Camera Communications
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DOI：10.1109/TMC.2020.2977042.png)
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Abstract
En 中文
Screen-camera communications, using a liquid crystal display (LCD) screen and camera image sensors, have been attractive variants of visible light communications (VLC) since any external light-emitting modules and photo detectors are required for recent mobile devices, which are usually equipped with display and camera. A major issue in screen-camera communications is a performance loss in transmission rate due to nonlinear channel impairments with ambient noise. To improve transmission rates, we investigate the impact of nonlinear channel equalization, nonbinary channel coding, probabilistic shaping, and nonlinear precoding for high-order modulation schemes. Experimental evaluations using an LCD screen and camera demonstrate that our proposed scheme achieves 3.8-3.3 times higher transmission rates compared to existing schemes for a communication distance of 60-160 cm.
Keywords:
Cameras
Image color analysis
Precoding
Receivers
Modulation
Nonlinear distortion
Probabilistic logic
Visible light communications
MIMO
screen-camera transmission
nonlinear equalization
nonbinary coding
lattice precoding
probabilistic shaping
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