47-kbit/s RGB-LED-based optical camera communication based on 2D-CNN and XOR-based data loss compensation.

Area of Science:

• Optoelectronics and Communication Systems
• Machine Learning for Signal Processing
• Mobile Device Communication Technologies

Background:

• Optical Camera Communication (OCC) systems using RGB-LEDs face significant performance degradation due to inter-symbol and inter-channel interference.
• Rolling shutter cameras in mobile devices introduce unique challenges for reliable data transmission in OCC systems.
• Efficient data recovery methods are crucial for enhancing the practical applicability of OCC technology.

Purpose of the Study:

• To develop an advanced data recovery technique for RGB-LED-based OCC systems utilizing rolling shutter cameras.
• To mitigate the impact of inter-symbol and inter-channel interference on data transmission quality.
• To significantly boost the achievable data rate in smartphone-based OCC applications.

Main Methods:

• A two-dimensional Convolutional Neural Network (CNN) structure was designed to learn complex features across color channels and adjacent symbols.
• The proposed CNN model effectively addresses data recovery challenges inherent in rolling shutter OCC systems with random data transmission.
• An XOR-based data loss compensation method was implemented to restore lost data packets, enhancing transmission integrity.

Main Results:

• The two-dimensional CNN structure demonstrated superior performance in learning inter-channel and inter-symbol features for accurate data recovery.
• The XOR-based compensation method successfully restored lost data, leading to a substantial 21% improvement in data rate.
• An experimental record-high data rate of 47 kbit/s was achieved in an RGB-LED OCC system using a smartphone's rolling shutter camera.

Conclusions:

• The proposed CNN and XOR-based methods provide an effective solution for improving data recovery and transmission rates in RGB-LED OCC systems.
• This research significantly advances the capabilities of mobile device-based OCC, paving the way for higher-speed wireless communication.
• The achieved record data rate highlights the potential of OCC technology for future high-throughput mobile communication applications.