研究目的
To analyze the performance of visible light communication by considering Line of Sight (LOS) and Non-Line of Sight (NLOS) propagations to improve the total data rate and the total output power of the LEDs.
研究成果
The study found that reflections in NLOS paths degrade BER by orders of magnitude (e.g., from 10^-11 to 10^-7), and varying FOV from 35° to 75° changes received power by approximately 6 dBm. Proper selection of LED positions and FOV is crucial for optimizing data rate and illumination in VLC systems, aiding in parameter estimation for high-speed communication applications.
研究不足
The simulation did not account for ambient light interference or other external factors; it was limited to point-to-point links and specific indoor conditions. Reflections were simplified with fixed attenuation, and practical variations in angles and distances may not be fully captured.
1：Experimental Design and Method Selection:
The study involved designing and simulating a VLC model using Optisystem simulation tool to analyze LOS and NLOS multipath scenarios with single and multiple LEDs, employing NRZ-OOK modulation.
2：Sample Selection and Data Sources:
Simulations were based on a standard indoor room of dimensions 3m x 3m x 3m with four walls, considering direct and reflected light paths.
3：List of Experimental Equipment and Materials:
Components included RGB LEDs, PIN photodiodes, low-pass filters, oscilloscope, BER analyzer, and various optical elements; specific models and brands were not detailed.
4：Experimental Procedures and Operational Workflow:
Signals were generated using NRZ-OOK, transmitted through LEDs, propagated in free space with reflections, received by photodiodes, filtered, and analyzed for power, BER, and eye diagrams.
5：Data Analysis Methods:
Data were analyzed using BER measurements, eye diagram analysis, and power level calculations based on mathematical models for channel gain and delay.
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