研究目的
To design a hybrid visible light and infrared data transmission scheme for indoor visible light communication systems with multi-pulse position modulation dimming control, ensuring reliable data transmission under all illumination conditions including dark scenario.
研究成果
The proposed hybrid VL/IR transmission scheme effectively utilizes the “off” periods of dimming controlled pulses for data transmission via an IR link, ensuring reliable communication under all dimming levels. It reduces the required M-QAM levels, symbol rate, and total transmit power, especially under low illumination levels.
研究不足
The study focuses on the LOS channel and ignores faint indoor reflections. The system complexity increases with the use of additional IR link and synchronization requirements.
1：Experimental Design and Method Selection:
The hybrid VL/IR transmission scheme is designed based on OFDM and MPPM dimming control. A low-power IR LED is used to assist the VL downlink. Both VL and IR OFDM signals are transmitted alternately during the “on” and “off” periods of MPPM dimming controlled pulses.
2：Sample Selection and Data Sources:
The system is tested in an indoor environment with specific parameters for VL and IR links.
3：List of Experimental Equipment and Materials:
VL and IR LEDs, PDs with wide spectral response, NOT gate, gate controlled switches.
4：Experimental Procedures and Operational Workflow:
The original data stream is divided into two parts for MPPM dimming controlled patterns and DCO-OFDM signals. The DCO-OFDM signals are transmitted via VL and IR LEDs alternately during the “on” and “off” periods of MPPM patterns.
5：Data Analysis Methods:
The performance is evaluated based on the required M-QAM levels, symbol rate, receiver sensitivity, and total required transmit power under different dimming levels.
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