研究目的
Investigating the performance of free-space optical communication links operating over lognormal turbulence channels using on-off keying (OOK) with finite extinction ratios and the elimination of irreducible error floors through the application of an electrical signal-to-noise ratio (SNR) optimized detection system.
研究成果
The study concludes that FSO systems operating with OOK and fixed detection thresholds can suffer from irreducible error floors, which can be eliminated by using electrical-SNR-optimized detection thresholds. The proposed system, which does not require rapid adjustment of the detection threshold, offers a practical solution to improve performance without the complexity of adaptive threshold detection.
研究不足
The study is limited to lognormal turbulence channels and assumes perfect knowledge of the turbulence probability distribution function (pdf) for some analyses. The accuracy of the Laguerre-polynomial-based approximation decreases for higher scintillation levels (σ > 0.75).
1：Experimental Design and Method Selection:
The study focuses on analyzing the performance of OOK modulated systems over lognormal turbulence channels with finite extinction ratios. It employs electrical-SNR-optimized detection thresholds to eliminate error floors.
2：Sample Selection and Data Sources:
The analysis is based on theoretical models and numerical simulations to validate the derived error floor expressions and the effectiveness of the proposed detection system.
3：List of Experimental Equipment and Materials:
The study does not specify physical equipment but relies on mathematical models and simulations.
4：Experimental Procedures and Operational Workflow:
The methodology involves deriving analytical error floor expressions, implementing an electrical-SNR-optimized detection system, and comparing its performance with adaptive detection systems through numerical simulations.
5：Data Analysis Methods:
The performance is evaluated based on bit-error rate (BER) versus electrical SNR, with comparisons made between systems using fixed, electrical-SNR-optimized, and adaptive detection thresholds.
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