研究目的
To propose and demonstrate a novel column matrix selection scheme based on energy diffusion (ED) of LED for visible light communication using mobile phone camera, aiming to avoid the blooming effect and improve the contrast ratio between bright and black stripes.
研究成果
The proposed column matrix selection scheme based on ED significantly improves the BER performance of VLC systems using mobile phone cameras, achieving a BER of 8.82 x 10-6 at 30 cm distance and 700 lux illuminance. The scheme effectively mitigates the blooming effect and enhances the contrast ratio between bright and dark stripes, with a data rate of up to 4.08kbit/s.
研究不足
The study is limited by the specific conditions of the experiment, such as the use of a circular LED lamp and the fixed resolution and frame rate of the mobile phone camera. The performance under varying LED shapes and higher data rates requires further investigation.
1：Experimental Design and Method Selection:
The study employs a novel column matrix selection scheme based on energy diffusion (ED) of LED for VLC using mobile phone camera. The methodology includes binary image processing, erosion and dilation based on ED, and threshold evaluation for signal demodulation.
2：Sample Selection and Data Sources:
The experiment uses a single white-light LED (Cree XLamp XP-E) as the transmitter and a mobile phone camera with CMOS image sensor (iPhone 6s) as the receiver.
3：List of Experimental Equipment and Materials:
Equipment includes a field-programmable gate array (FPGA) from the Xilinx Spartan 6series (xc6slx45), LED driver, and MATLAB for offline video processing.
4：Experimental Procedures and Operational Workflow:
The process involves generating data offline, transmitting via LED, capturing video with the mobile phone camera, and processing the video for synchronization, demodulation, and BER analysis.
5：Data Analysis Methods:
The analysis includes evaluating the BER performance under different illuminances and distances, comparing the proposed scheme with the conventional column matrix selection scheme.
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