High Accuracy and Low Complexity Frequency Offset Estimation Method Based on All Phase FFT for M-QAM Coherent Optical Systems

The traditional fast Fourier transform based frequency offset estimation (FFT-FOE) estimates the frequency offset by searching the spectral peak of the signal after the fourth power operation, which is suitable for multiple modulation formats. But the accuracy of FOE is limited by the number of FFT...

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Autores principales:	Qian Li, Aiying Yang, Peng Guo, Xiangjun Xin
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2022
Materias:	Frequency offset estimation all phase FFT coherent communication Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
Acceso en línea:	https://doaj.org/article/9d1adedd395344f5b9019a8e11996a31
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id	oai:doaj.org-article:9d1adedd395344f5b9019a8e11996a31
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spelling	oai:doaj.org-article:9d1adedd395344f5b9019a8e11996a312021-11-23T00:00:29ZHigh Accuracy and Low Complexity Frequency Offset Estimation Method Based on All Phase FFT for M-QAM Coherent Optical Systems1943-065510.1109/JPHOT.2021.3126580https://doaj.org/article/9d1adedd395344f5b9019a8e11996a312022-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9609640/https://doaj.org/toc/1943-0655The traditional fast Fourier transform based frequency offset estimation (FFT-FOE) estimates the frequency offset by searching the spectral peak of the signal after the fourth power operation, which is suitable for multiple modulation formats. But the accuracy of FOE is limited by the number of FFT points. In this paper, we propose a high accuracy and low complexity FOE algorithm based on all phase FFT (APFFT-FOE). The accuracy of FOE can be improved effectively with lower additional computational complexity. Simulation results show that the mean square error of APFFT-FOE is reduced by more than one order of magnitude compared with the FFT-FOE. Compared with other FOE algorithms that can achieve the same accuracy, the additional computational complexity required by APFFT-FOE is reduced by more than 50<inline-formula><tex-math notation="LaTeX">$\%$</tex-math></inline-formula>. Finally, the APFFT-FOE is experimentally verified with 20 GBaud 16/64-QAM modulation signal. The experimental results show that the required OSNR for 16-QAM signal to reach 6.7<inline-formula><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> hard-decision forward-error correction is relaxed by 0.23 dB. For 64-QAM signal, the required OSNR at 20<inline-formula><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> soft-decision forward-error correction threshold is relaxed by 0.68 dB.Qian LiAiying YangPeng GuoXiangjun XinIEEEarticleFrequency offset estimationall phase FFTcoherent communicationApplied optics. PhotonicsTA1501-1820Optics. LightQC350-467ENIEEE Photonics Journal, Vol 14, Iss 1, Pp 1-6 (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Frequency offset estimation all phase FFT coherent communication Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
spellingShingle	Frequency offset estimation all phase FFT coherent communication Applied optics. Photonics TA1501-1820 Optics. Light QC350-467 Qian Li Aiying Yang Peng Guo Xiangjun Xin High Accuracy and Low Complexity Frequency Offset Estimation Method Based on All Phase FFT for M-QAM Coherent Optical Systems
description	The traditional fast Fourier transform based frequency offset estimation (FFT-FOE) estimates the frequency offset by searching the spectral peak of the signal after the fourth power operation, which is suitable for multiple modulation formats. But the accuracy of FOE is limited by the number of FFT points. In this paper, we propose a high accuracy and low complexity FOE algorithm based on all phase FFT (APFFT-FOE). The accuracy of FOE can be improved effectively with lower additional computational complexity. Simulation results show that the mean square error of APFFT-FOE is reduced by more than one order of magnitude compared with the FFT-FOE. Compared with other FOE algorithms that can achieve the same accuracy, the additional computational complexity required by APFFT-FOE is reduced by more than 50<inline-formula><tex-math notation="LaTeX">$\%$</tex-math></inline-formula>. Finally, the APFFT-FOE is experimentally verified with 20 GBaud 16/64-QAM modulation signal. The experimental results show that the required OSNR for 16-QAM signal to reach 6.7<inline-formula><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> hard-decision forward-error correction is relaxed by 0.23 dB. For 64-QAM signal, the required OSNR at 20<inline-formula><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> soft-decision forward-error correction threshold is relaxed by 0.68 dB.
format	article
author	Qian Li Aiying Yang Peng Guo Xiangjun Xin
author_facet	Qian Li Aiying Yang Peng Guo Xiangjun Xin
author_sort	Qian Li
title	High Accuracy and Low Complexity Frequency Offset Estimation Method Based on All Phase FFT for M-QAM Coherent Optical Systems
title_short	High Accuracy and Low Complexity Frequency Offset Estimation Method Based on All Phase FFT for M-QAM Coherent Optical Systems
title_full	High Accuracy and Low Complexity Frequency Offset Estimation Method Based on All Phase FFT for M-QAM Coherent Optical Systems
title_fullStr	High Accuracy and Low Complexity Frequency Offset Estimation Method Based on All Phase FFT for M-QAM Coherent Optical Systems
title_full_unstemmed	High Accuracy and Low Complexity Frequency Offset Estimation Method Based on All Phase FFT for M-QAM Coherent Optical Systems
title_sort	high accuracy and low complexity frequency offset estimation method based on all phase fft for m-qam coherent optical systems
publisher	IEEE
publishDate	2022
url	https://doaj.org/article/9d1adedd395344f5b9019a8e11996a31
work_keys_str_mv	AT qianli highaccuracyandlowcomplexityfrequencyoffsetestimationmethodbasedonallphasefftformqamcoherentopticalsystems AT aiyingyang highaccuracyandlowcomplexityfrequencyoffsetestimationmethodbasedonallphasefftformqamcoherentopticalsystems AT pengguo highaccuracyandlowcomplexityfrequencyoffsetestimationmethodbasedonallphasefftformqamcoherentopticalsystems AT xiangjunxin highaccuracyandlowcomplexityfrequencyoffsetestimationmethodbasedonallphasefftformqamcoherentopticalsystems
_version_	1718417392188522496

High Accuracy and Low Complexity Frequency Offset Estimation Method Based on All Phase FFT for M-QAM Coherent Optical Systems

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