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Accurate digital frequency offset estimator for coherent PolMux QAM transmission systems

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TLDR
An accurate blind frequency offset estimator adapted to QAM modulated signal is proposed and can be recovered with a few kHz accuracy for coherent 100Gbit/s QAM PolMux transmission.
Abstract
An accurate blind frequency offset estimator adapted to QAM modulated signal is proposed. For coherent 100Gbit/s QAM PolMux transmission, frequency offset can be recovered with an accuracy of a few kHz.

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Digital Coherent Optical Receivers: Algorithms and Subsystems

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Digital Signal Processing for Coherent Transceivers Employing Multilevel Formats

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High Spectral Efficiency 400 Gb/s Transmission Using PDM Time-Domain Hybrid 32–64 QAM and Training-Assisted Carrier Recovery

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Advancing theoretical understanding and practical performance of signal processing for nonlinear optical communications through machine learning.

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