研究目的
To propose and evaluate a selective visible light communication method that enables communication with specific cameras using a single light source by exploiting differences in reception sensitivity to OFDM carrier waves based on exposure time ratios.
研究成果
The proposed selective VLC method was successfully demonstrated, allowing a single camera to decode symbols from specific carrier waves based on exposure time ratios, while others were decoded erroneously. Experimental results confirmed the theoretical selectivity, though performance varied with distance and modulation order. Future work should focus on improving VLC speed and developing smartphone applications for selective VLC.
研究不足
The method becomes difficult to implement with an increasing number of cameras due to challenges in finding optimal exposure time ratios and carrier waves. Performance was worse than expected for the 50th carrier wave, and deterioration occurred with higher-order PSK modulations. Further investigation is needed into the causes of these issues and the impact of varying the number of carrier waves.
1：Experimental Design and Method Selection:
The experiment was designed to validate a selective VLC method using OFDM signals with multiple carrier waves and varying exposure time ratios for cameras. A genetic algorithm was used to optimize exposure time ratios and carrier wave orders to maximize selectivity.
2：Sample Selection and Data Sources:
A single USB
3：0 video camera was used to simulate multiple cameras by setting different exposure time ratios. The light source was a white LED floodlight reflected off a white wall. List of Experimental Equipment and Materials:
Equipment included a PointGrey FL3-U3-13S2C-CS camera, a W-LITE DL-FL-001 LED floodlight, and an NF Corporation WF1948 function generator.
4：Experimental Procedures and Operational Workflow:
The camera's alive time was measured to determine the fundamental frequency. Carrier waves at 50th, 75th, 78th, and 80th orders were generated with OFDM signals modulated by 4, 8, and 16 PSK. Exposure time ratios were set to specific values (e.g.,
5：9872, 5000, 2000, 6799) for selective reception. Experiments were conducted at distances of 5m and 2m in a dark room. Data Analysis Methods:
Error rates were calculated for different carrier waves and exposure time ratios to assess VLC performance and selectivity.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
