研究目的
To investigate the experimental performance of LEDs as both photo-emitter and photoreceiver and to establish an LED-LED link for indoor visible light communication.
研究成果
The LED-LED link is feasible for indoor visible light communication with some limitations in terms of data rates. The red-red combination of LED-LED link gives the best performance in terms of received signal strength. Higher biasing voltage increases the responsivity of red color LED. The achieved SNR value of 11 dB is recorded for MOSFET and 8 dB using BJT transistor at a distance of up to 20 cm.
研究不足
The system has limitations in terms of data rates due to low bandwidth which depends on the detection area, field of view, and junction capacitance of LED. The LED response to shorter or equal range of wavelengths and also has smaller responsivity which requires an amplifier circuit to receive the light signal accurately.
1：Experimental Design and Method Selection:
The study uses BJT and MOSFET based drive circuits at the transmitting side and a resistor driver operated in photo-conductive mode at the receiver side. The LED response as transmitter and receiver is investigated at different operating frequencies.
2：Sample Selection and Data Sources:
Six different color LEDs are tested on both sides of the transceiver to determine the best performing pair.
3：List of Experimental Equipment and Materials:
Includes programmable function generator HM8130, TEK-TRONIX (TBS1072B) 70MHz Digital Storage Oscilloscope, and various LEDs with specifications listed in the paper.
4：Experimental Procedures and Operational Workflow:
The digital data is transmitted through the programmable function generator to the LED driver circuit. The input signal is modulated using OOK (On-Off Keying) technique.
5：Data Analysis Methods:
The output signal at the receiver module is connected to the oscilloscope to view the signals from the reverse biased LED working as a photo-detector.
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
