Compensation for In-Phase/Quadrature Phase Mismatch in Coherent Free-Space Optical QPSK Communication Systems

doi:10.3390/app11062543

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	Compensation for In-Phase/Quadrature Phase Mismatch in Coherent Free-Space Optical QPSK Communication Systems
	X. L. Li; T. W. Geng; Y. C. Gu; R. T. Tian and S. J. Gao
	2021
发表期刊	Applied Sciences-Basel
卷号	11 期号:6 页码:11
摘要	Featured Application In this paper, we put forward an algorithm switching orthogonalization procedure (ASOP) according to the quality of the in-phase and quadrature signal branches based on the Q value of the eye diagram with less computation. The proposed ASOP scheme can contribute to the frequency offset estimation and phase estimation of free-space optical communication (FSO) systems with turbulence disturbance. Thus, it is hoped that the ASOP scheme we proposed will see the practical application of coherent FSO communication. The Gram-Schmidt orthogonalization procedure (GSOP) and Lowdin symmetric orthogonalization procedure (SYOP) are the two mainstream algorithms for the compensation of phase mismatch in an imperfect optical 90 degrees hybrid. In this paper, we put forward an algorithm switching orthogonalization procedure (ASOP) according to the quality of in-phase and quadrature signals based on the Q value of the eye diagram with less computation. If the quality of the in-phase and quadrature signals has a significant difference, we use the GSOP and select the signal branch with better quality as the initial reference vector for orthogonalization. If they are of about the same quality, then we use the SYOP. We present computer simulations for a coherent free-space optical (FSO) quadrature phase-shift keying (QPSK) communication system and demonstrate the system improvement that can be achieved using the ASOP. Finally, we also show that the proposed ASOP scheme can contribute to the frequency offset and phase estimation of the FSO system in the environment of atmospheric turbulence.
DOI	10.3390/app11062543
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收录类别	SCI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/65106
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	X. L. Li,T. W. Geng,Y. C. Gu,et al. Compensation for In-Phase/Quadrature Phase Mismatch in Coherent Free-Space Optical QPSK Communication Systems[J]. Applied Sciences-Basel,2021,11(6):11.
APA	X. L. Li,T. W. Geng,Y. C. Gu,&R. T. Tian and S. J. Gao.(2021).Compensation for In-Phase/Quadrature Phase Mismatch in Coherent Free-Space Optical QPSK Communication Systems.Applied Sciences-Basel,11(6),11.
MLA	X. L. Li,et al."Compensation for In-Phase/Quadrature Phase Mismatch in Coherent Free-Space Optical QPSK Communication Systems".Applied Sciences-Basel 11.6(2021):11.

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