Performance of free-space optical communications using SC-QAM signals over strong atmospheric turbulence and pointing errors

2014 IEEE Fifth International Conference on Communications and Electronics (ICCE) Pub Date : 2014-10-07 DOI:10.1109/CCE.2014.6916677

Ha Duyen Trung, D. T. Tuan

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引用次数: 8

Abstract

We theoretically analyze the performance of free-space optical (FSO) communication systems using subcarrier intensity quadrature amplitude modulation (SC-QAM) signals over strong atmospheric turbulence channels together with pointing errors. We take into account atmospheric attenuation, atmospheric turbulence and pointing errors. In order to model atmospheric turbulence, we employ a gamma-gamma distribution for strong turbulent condition. Meanwhile, we study pointing errors by using a fading model where the influence of beam width, detector size and jitter variance is considered. In addition, we use a combination of these models to analyze the combined effect of atmospheric turbulence and pointing error to SC-QAM/FSO systems. Finally, we derive a closed-form expression for evaluating the average symbol error rate (ASER) performance of such systems. Numerically evaluated results present the impact of pointing errors on the performance of SC-QAM/FSO systems over strong atmospheric turbulence. Moreover, simulation results show that the closed-form expression can provide a precision for evaluating ASER performance of such systems.

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使用SC-QAM信号的自由空间光通信在强大气湍流和指向误差下的性能

本文从理论上分析了使用副载波强度正交调幅(SC-QAM)信号的自由空间光学(FSO)通信系统在强大气湍流信道上的性能以及指向误差。我们考虑了大气衰减、大气湍流和指向误差。为了模拟大气湍流，我们在强湍流条件下采用gamma-gamma分布。同时，在考虑波束宽度、探测器尺寸和抖动方差影响的衰落模型下，对指向误差进行了研究。此外，我们使用这些模型的组合来分析大气湍流和指向误差对SC-QAM/FSO系统的综合影响。最后，我们导出了一个用于评估这类系统的平均符号误码率(ASER)性能的封闭表达式。数值计算结果显示了指向误差对SC-QAM/FSO系统在强大气湍流条件下性能的影响。仿真结果表明，该封闭表达式能够较精确地评价该类系统的ASER性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2014 IEEE Fifth International Conference on Communications and Electronics (ICCE)

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