研究目的
To compare NRZ and RZ modulation formats using a dual wavelength model at a bit rate of 10 Gbps to determine which modulation format provides better Q-factor for FSO communication systems in high-speed trains.
研究成果
NRZ modulation format provides better performance (BER of 4.5e-291 and Q-factor of 36.43) compared to RZ modulation format (BER of 1.6e-220 and Q-factor of 24.19 for 33% duty cycle). The system performance degrades with increasing attenuation under adverse weather conditions.
研究不足
The study is limited to simulation-based analysis using OptiSystem software and does not account for all real-world variables such as dynamic weather changes and physical obstructions.
1：Experimental Design and Method Selection:
The study employs a dual wavelength ground-to-train FSO communication model using two different wavelengths alternately by adjacent base stations. The performance is measured in terms of BER and Q-factor.
2：Sample Selection and Data Sources:
The system is simulated using OptiSystem software v15.2 with parameters including laser power, beam divergence, and aperture diameters.
3：2 with parameters including laser power, beam divergence, and aperture diameters.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Laser sources with wavelengths of 850 nm and 1550 nm, transmitter and receiver aperture diameters, and a BER analyzer.
4：Experimental Procedures and Operational Workflow:
The system is tested under different weather conditions (clear, haze, rain, fog) and modulation formats (NRZ, RZ with 33% and 67% duty cycles).
5：Data Analysis Methods:
The performance is analyzed based on Q-factor and BER measurements.
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