研究目的
To analytically study the performance of SIM/S-QAM FSO systems under both turbulence-induced phase error and turbulence-induced fading, specifically for squared-QAM (S-QAM), filling a gap in previous research.
研究成果
Turbulence-induced phase errors significantly degrade FSO system performance, especially in moderate turbulence regimes, with power penalties of 2-3 dB observed. Higher PLL gain can mitigate phase errors, but its effectiveness diminishes in strong turbulence. The analytical model is validated by simulations, providing insights for system design and future studies on phase error mitigation.
研究不足
The study focuses on a specific case of 16-QAM and assumes Gamma-Gamma and Tikhonov models; it does not address other modulation schemes or real-world environmental variations. The impact of phase errors is significant in moderate turbulence, but fading dominates in strong turbulence, and further investigation on PLL optimization is needed.
1：Experimental Design and Method Selection:
The study uses theoretical modeling with Gamma-Gamma distribution for atmospheric turbulence-induced fading and Tikhonov model for phase errors. Monte Carlo simulations are employed to validate the analytical results.
2：Sample Selection and Data Sources:
Not applicable as the study is simulation-based; no physical samples or datasets are used.
3：List of Experimental Equipment and Materials:
Not specified in the paper; the work is computational and analytical.
4：Experimental Procedures and Operational Workflow:
The system model includes a transmitter with S-QAM modulator and laser, an atmospheric channel modeled with Gamma-Gamma fading and Tikhonov phase error, and a receiver with photo-detector and demodulator. Numerical integration and simulations are performed to compute ASEP.
5：Data Analysis Methods:
Analytical derivation of ASEP using error functions and probability distributions, with numerical evaluation and Monte Carlo simulation for validation.
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