Performance Analysis of an OFDM Optical DQPSK FSO Link considering Strong Atmospheric Turbulence with Pointing Error

2019 IEEE International Conference on Telecommunications and Photonics (ICTP) Pub Date : 2019-12-01 DOI:10.1109/ICTP48844.2019.9041706

M. Islam, S. Majumder

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Abstract

In this article, we investigate the effect of pointing error on the performance of an orthogonal frequency division multiplexed (OFDM) optical differential quadrature phase shift keying (DQPSK) modulated FSO system. Analytical approach is developed to find the expressions for output current and SNR in presence of strong atmospheric turbulence with pointing error. The conditional bit error rate for a given turbulence induced fadingand pointing error is also derived. Average BER is obtained by averaging the conditional BER over the pdf of pointing error along with thepdf of turbulence induced fading to be Gamma-Gamma distribution. It is clearly observed that the proposed system suffers almost 1.95dB and 1.25dB power penalty due to normalized pointing error standard deviation2 and 1.5 respectively against strong turbulence and 1.7dB and 1.05dB power penalty due to normalized pointing error standard deviation2 and 1.5 respectively against weak turbulence at aBER of 10−9. Results also show that the allowable link distance reduce drastically due to the combined effect of strong turbulence and pointing error.

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考虑强大气湍流和指向误差的OFDM光DQPSK FSO链路性能分析

在本文中，我们研究了指向误差对正交频分复用(OFDM)光微分正交相移键控(DQPSK)调制FSO系统性能的影响。采用解析的方法，求出了具有指向误差的强大气湍流条件下输出电流和信噪比的表达式。还推导了给定湍流诱导衰落和指向误差的条件误码率。平均误码率是将条件误码率与指向误差的误码率和湍流诱导衰落的误码率平均为Gamma-Gamma分布。可以清楚地观察到，在aBER为10−9时，在强湍流条件下，系统由于归一化指向误差标准偏差2和1.5分别遭受1.95dB和1.25dB的功率损失，在弱湍流条件下，系统由于归一化指向误差标准偏差2和1.5分别遭受1.7dB和1.05dB的功率损失。结果还表明，由于强湍流和指向误差的共同作用，允许连杆距离急剧减小。

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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2019 IEEE International Conference on Telecommunications and Photonics (ICTP)

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