Pointing Error Effects on Free-Space Optical Communication Links in the Presence of Atmospheric Turbulence
Pointing Error Effects on Free-Space Optical Communication Links in the Presence of Atmospheric Turbulence
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DOI：
10.1109/jlt.2009.2022771
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发表时间：
2009-05
影响因子：
4.7
通讯作者：
D. Borah;D. Voelz
中科院分区：
文献类型：
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作者：
D. Borah;D. Voelz
研究了指向误差对自由空间光通信系统性能的影响。对数正态和伽马-伽马辐照概率密度函数模型已被认为包括光学湍流的影响。导出了指向起伏下平均光强的表达式。遍历和中断信道容量的结果。由于辐照度统计随指向波动而变化，提出了一种基于波动光学的方法来评估容量表达式。虽然一般来说，湍流会降低通信链路的性能，但它可以通过增加有效波束半径来降低对指向误差的敏感性。最后，我们提出的解析表达式评估的比特错误率性能的开关键控系统中存在的指向错误，并提供错误的性能结果。
The effects of pointing errors on the performance of a free-space optical laser communication system are studied. The log-normal and gamma-gamma irradiance probability density function models have been considered to include the effects of optical turbulence. An expression for the mean intensity under pointing fluctuations is derived. Results for ergodic and outage channel capacities are presented. Since the irradiance statistics vary with pointing fluctuations, a wave-optics-based approach is proposed to evaluate the capacity expressions. Although, in general, turbulence degrades communications link performance, it can reduce sensitivity to pointing errors by increasing the effective beam radius. Finally, we present analytical expressions for evaluating the bit-error-rate performance of the on -off keying system in the presence of pointing errors, and provide error performance results.