Design and implementation of a real-time CIM-MIMO optical camera communication system
Optics Express
|November 10, 2016
Summary
A novel optical camera communication system uses color-intensity modulation (CIM) with multiple LEDs to achieve high data rates. This real-time system demonstrates 126.72 kbps over 1.4m without external optics.
Area of Science:
- Optical Engineering
- Wireless Communication Technologies
- Signal Processing
Background:
- Optical Camera Communication (OCC) offers a potential wireless communication solution.
- Color-Intensity Modulation (CIM) is an emerging technique for enhancing OCC data rates.
- Existing CIM-OCC systems face challenges in real-time implementation and performance.
Purpose of the Study:
- To design and implement a real-time Color-Intensity Modulation Multi-Input-Multi-Output (CIM-MIMO) optical camera communication (OCC) system.
- To investigate the feasibility of using commercial LED arrays and mobile phone cameras for OCC.
- To achieve a high data rate over a practical distance without external optical components.
Main Methods:
- Developed a CIM-MIMO OCC system utilizing multiple intensity levels and RGB colors from LED modules.
- Designed M-ary CIM symbols, signal constellations, and training sequences to mitigate system imperfections.
- Implemented the system using 192 LEDs from a commercial 16x16 LED array and a mobile phone camera.
Main Results:
- Achieved a real-time data rate of 126.72 kbps.
- Demonstrated successful communication over a distance of 1.4 meters.
- Operated at an LED refresh rate of 82.5 Hz and a camera frame rate of 330 fps without external optical assistance.
Conclusions:
- The implemented real-time CIM-MIMO OCC system is effective for high-speed wireless data transmission.
- Commercial LED arrays and mobile phone cameras can be utilized for practical OCC applications.
- The system shows promise for future indoor or short-range wireless optical communication.
