研究目的
To extend the range of a visible light communication (VLC) link using a simple, low-cost, and reliable electronic circuitry and a highly resonant frequency selective active band pass filter at the receiver section.
研究成果
The study demonstrated that employing an IGMF active band pass filter at the receiver can achieve a VLC link with an SNR value above 10dB at a distance of 1.5 meters without any form of lensing. Future work should explore higher center frequencies, different modulation techniques, and the system's viability under ambient conditions.
研究不足
The study was limited to low-frequency applications (up to 10KHz) and did not explore the system's performance under ambient conditions or with different modulation techniques.
1：Experimental Design and Method Selection:
The study involved designing a VLC system with a transmitter module using an LED driver and a receiver module with a trans-impedance amplifier (TIA) followed by an Infinite Gain Multiple Feedback (IGMF) filter. The filter was designed for specific center frequencies with high Quality factor and gain.
2：Sample Selection and Data Sources:
A 3-Watt power LED and a VTP1220FB silicon photodiode were used in the transmitter and receiver sections, respectively.
3：List of Experimental Equipment and Materials:
Components included a BJT for the LED driver, LM358 operational amplifier for the TIA, and μA741 operational amplifier for the IGMF filter.
4：Experimental Procedures and Operational Workflow:
The system was tested at three different center frequencies (1KHz, 3KHz, and 10KHz) with SNR measurements taken at various distances between the transmitter and receiver.
5：Data Analysis Methods:
SNR vs Distance measurements were evaluated and compared for the three sets of center frequencies.
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