研究目的
To design and evaluate the performance of a hybrid FSO-SACOCDMA system under different weather conditions, focusing on extending communication range and improving signal quality.
研究成果
The hybrid FSO-SACOCDMA system using NZCC code and direct detection is effective, achieving up to 13 km range in clear weather without amplification and 35 km with optical amplification, while maintaining acceptable SNR and BER. Weather conditions significantly impact performance, with clear weather yielding the best results. Future work could focus on enhancing robustness against adverse weather.
研究不足
The performance is highly dependent on weather conditions, with significant degradation in fog and haze. The system may not perform well in adverse weather, and the simulation is based on specific parameters that might not cover all real-world scenarios. Optimization is needed for broader applicability.
1：Experimental Design and Method Selection:
The system is designed using direct detection (DD) technique and NZCC code to reduce multiple access interference (MAI) and phase-induced intensity noise (PIIN). The simulation is conducted using OptiSystem software to model the FSO-SACOCDMA system.
2：Sample Selection and Data Sources:
Ten users are simulated, each transmitting data at 10 Gb/s, with wavelengths in the range 1550–
3：8 nm and 8 nm spacing. Weather conditions include clear weather, haze, and various types of fog (thin, light, medium, heavy). List of Experimental Equipment and Materials:
15 Components include pseudo-random bit sequence generator, NRZ pulse generator, laser, WDM multiplexer, Mach-Zehnder modulator, optical amplifier, avalanche photodetector, low-pass filter, and FSO channel.
4：Experimental Procedures and Operational Workflow:
Data is generated, modulated, multiplexed, transmitted through the FSO channel under different weather attenuations, and received/demodulated. Performance is measured in terms of BER, SNR, and received power.
5：Data Analysis Methods:
Results are analyzed using graphs and tables to compare BER, SNR, and power across different ranges and weather conditions, with and without optical amplification.
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