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首页> 外文期刊>Lightwave Technology, Journal of >Subcarrier PSK Performance in Terrestrial FSO Links Impaired by Gamma-Gamma Fading, Pointing Errors, and Phase Noise
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Subcarrier PSK Performance in Terrestrial FSO Links Impaired by Gamma-Gamma Fading, Pointing Errors, and Phase Noise

机译：受Gamma-Gamma衰落，指向错误和相位噪声影响的地面FSO链路中的子载波PSK性能

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摘要

For terrestrial free-space optical (FSO) communication systems, subcarrier intensity modulation represents an attractive alternative to on-off keying or pulse-position modulation, which is mainly because of the larger spectral efficiency. However, some degradation of the error performance must be taken into account due to nonperfect synchronization of carrier frequency and phase. In a recently published paper, the average bit error probability has been analyzed for M-ary phase-shift keying in the presence of phase noise for a terrestrial FSO link impaired by lognormal fading. In the this paper, we are extending this study to a gamma-gamma model, which is usually applied in case of moderate-to-strong scintillation effects. On top of that, pointing errors, caused by a misalignment between transmitter and receiver of the FSO link, are considered as well. Since a closed-form solution is not available under general conditions and because numerical methods are time-consuming, suffering in part also from serious convergence and stability problems, we provide approximate closed-form expressions, which are accurate enough over a wide signal-to-noise ratio range.
机译：对于地面自由空间光（FSO）通信系统，副载波强度调制代表了开关键控或脉冲位置调制的一种有吸引力的替代方法，这主要是因为频谱效率更高。但是，由于载波频率和相位的不完美同步，必须考虑到错误性能的某些下降。在最近发表的一篇论文中，已经分析了由于对数正态衰落而受损的地面FSO链路在存在相位噪声的情况下，对于M元相移键控的平均误码率。在本文中，我们将这项研究扩展到了伽玛-伽玛模型，该模型通常适用于中度到强烈的闪烁效应。最重要的是，还考虑了由FSO链路的发送器和接收器之间的未对准引起的指向错误。由于在一般情况下无法使用封闭形式的解决方案，并且由于数值方法耗时，并且还部分遭受严重的收敛性和稳定性问题的困扰，因此我们提供了近似封闭形式的表达式，这些表达式在较宽的信号强度范围内都足够准确-噪声比范围。

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