研究目的
To develop a high-efficiency Li-Fi transmitter for simultaneous illumination and visible light communications using LED lighting, decoupling power converter switching frequency from modulation frequency to optimize efficiency and high-speed data transfers.
研究成果
The proposed Li-Fi transmitter using a SIMO power converter successfully decouples the power converter switching frequency from the VLC modulator frequency, improving energy efficiency. The use of GaN FETs in the VLC modulator facilitates high-speed switching, enhancing the inherent bandwidth of the LEDs by 3x. The system demonstrates effective simultaneous illumination and high-speed data transfer.
研究不足
The bandwidth of the optical output is limited by the inherent characteristics of the LEDs and the phosphor coating. The efficiency of the system may be affected by the switching activity of the modulator.
1：Experimental Design and Method Selection:
The proposed transmitter is based on a Single Inductor Multiple Output (SIMO) buck converter with two independently controllable channels for illumination and communication. GaN devices are used for high-speed modulation.
2：Sample Selection and Data Sources:
PC white LEDs for illumination and red LEDs for communication are used. Data transfer rates of up to 20 Mbps are tested.
3：List of Experimental Equipment and Materials:
GaN FETs (EPC8004), PC white LEDs, red LEDs, Avalanche Photo Diode (APD) with 400MHz bandwidth.
4：Experimental Procedures and Operational Workflow:
The power converter is operated at 50kHz for efficiency, with the VLC modulator operating at higher frequencies for data transfer. The control scheme ensures independent current control for illumination and communication channels.
5：Data Analysis Methods:
Simulations were carried out using LTspiceTM and MatlabTM for encoder output generation. Experimental results validate the simulation outcomes.
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