Low-Complexity Blind Carrier Phase Recovery for C-mQAM Coherent Systems

Zhang, Ping; Ren, Hongliang; Gao, Mingyi; Lu, Jin; Le, Zichun; Qin, Yali; Hu, Weisheng

doi:10.1109/jphot.2018.2884024

Cited by 5 publications

(5 citation statements)

References 29 publications

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“…where Re(•) denotes the real projection operator, and DD(•) is the direct pre-decision operator. Subsequently, the conventional unwrap operation is performed to partly solve the problem of phase ambiguity [42]. Then, the received PAM symbol is obtained as follows:…”

Section: Principle Of the Phase Noise Compensation Methodsmentioning

confidence: 99%

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Time-Domain Blind ICI Compensation in Coherent Optical FBMC/OQAM System

Gao

et al. 2020

Sensors

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A blind discrete-cosine-transform-based phase noise compensation (BD-PNC) is proposed to compensate the inter-carrier-interference (ICI) in the coherent optical offset-quadrature amplitude modulation (OQAM)-based filter-bank multicarrier (CO-FBMC/OQAM) transmission system. Since the phase noise sample can be approximated by an expansion of the discrete cosine transform (DCT) in the time-domain, a time-domain compensation model is built for the transmission system. According to the model, phase noise compensation (PNC) depends only on its DCT coefficients. The common phase error (CPE) compensation is firstly performed for the received signal. After that, a pre-decision is made on a part of compensated signals with low decision error probability, and the pre-decision results are used as the estimated values of transmitted signals to calculate the DCT coefficients. Such a partial pre-decision process reduces not only decision error but also the complexity of the BD-PNC method while keeping almost the same performance as in the case of the pre-decision of all compensated signals. Numerical simulations are performed to evaluate the performance of the proposed scheme for a 30 GBaud CO-FBMC/OQAM system. The simulation results show that its bit error rate (BER) performance is improved by more than one order of magnitude through the mitigation of the ICI in comparison with the traditional blind PNC scheme only aiming for CPE compensation.

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Section: Principle Of the Phase Noise Compensation Methodsmentioning

confidence: 99%

“…Subsequently, the conventional unwrap operation is performed to partly solve the problem of phase ambiguity [42]. Then, the received PAM symbol is obtained as follows:…”

Section: Principle Of the Phase Noise Compensation Methodsmentioning

confidence: 99%

Time-Domain Blind ICI Compensation in Coherent Optical FBMC/OQAM System

Gao

et al. 2020

Sensors

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“…Low Complex single tap equalization is designed by [33], in which pre-equalization and equalization matrices are constructed. In general, multi-carrier systems split the bandwidth to number of narrow bands.…”

Section: Chromatic Dispersion Compensation Techniques I Single Tap Eq...mentioning

confidence: 99%

Compensating Chromatic Dispersion and Phase Noise using Parallel AFB-MBPS For FBMC-OQAM Optical Communication System

H. Abbas,

M. Jamel

2023

Int. j. electr. comput. eng. syst. (Online)

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Filter Bank Multi-Carrier Offset-QAM (FBMC-OQAM) is one of the hottest topics in research for 5G multi-carrier methods because of its high efficiency in the spectrum, minimal leakage in the side lobes, zero cyclic prefix (CP), and multiphase filter design. Large-scale subcarrier configurations in optical fiber networks need the use of FBMC-OQAM. Chromatic dispersion is critical in optical fiber transmission because it causes different spectral waves (color beams) to travel at different rates. Laser phase noise, which arises when the phase of the laser output drifts with time, is a major barrier that lowers throughput in fiber-optic communication systems. This deterioration may be closely related among channels that share lasers in multichannel fiber-optic systems using methods like wavelength-division multiplexing with frequency combs or space-division multiplexing. In this research, we use parallel Analysis Filter Bank (AFB) equalizers in the receiver part of the FBMC OQAM Optical Communication system to compensate for chromatic dispersion (CD) and phase noise (PN). Following the equalization of CD compensation, the phase of the carriers in the received signal is tracked and compensated using Modified Blind Phase Search (MBPS). The CD and PN compensation techniques are simulated and analyzed numerically and graphically to determine their efficacy. To evaluate the FBMC's efficiency across various equalizers, 16-OQAM is taken into account. Bit Error Rate (BER), Optical Signal-to-Noise Ratio (OSNR), Q-Factor, and Mean Square Error (MSE) were the primary metrics we utilized to evaluate performance. Single-tap equalizer, multi-tap equalizer (N=3), ISDF equalizer with suggested Parallel Analysis Filter Banks (AFBs) (K=3), and MBPS were all set aside for comparison. When compared to other forms of Nonlinear compensation (NLC), the CD and PN tolerance attained by Parallel AFB equalization with MBPS is the greatest.

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“…Thus, the process of CPR is also contributed to a degree of complexity. This part of complexity may vary for different system implementations; and the detailed analyses are reported in [28][29][30].…”

Section: B Long-haul Transmissionmentioning

confidence: 99%

Linear Regression vs. Deep Learning for Signal Quality Monitoring in Coherent Optical Systems

et al. 2022

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Error vector magnitude (EVM) is a metric for assessing the quality of m-ary quadrature amplitude modulation (mQAM) signals. Recently proposed deep learning techniques, e.g., feedforward neural networks (FFNNs) -based EVM estimation scheme leverage fast signal quality monitoring in coherent optical communication systems. Such a scheme estimates EVM from amplitude histograms (AHs) of short signal sequences captured before carrier phase recovery (CPR). In this work, we explore further complexity reduction by proposing a simple linear regression (LR) -based EVM monitoring method. We systematically compare the performance of the proposed method with the FFNN-based scheme and demonstrate its capability to infer EVM from an AH when the modulation format information is known in advance. We perform both simulation and experiment to show that the LR-based EVM estimation method achieves a comparable accuracy as the FFNN-based scheme. The technique can be embedded with modulation format identification modules to provide comprehensive signal information. Therefore, this

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Low-Complexity Blind Carrier Phase Recovery for C-mQAM Coherent Systems

Cited by 5 publications

References 29 publications

Time-Domain Blind ICI Compensation in Coherent Optical FBMC/OQAM System

Time-Domain Blind ICI Compensation in Coherent Optical FBMC/OQAM System

Compensating Chromatic Dispersion and Phase Noise using Parallel AFB-MBPS For FBMC-OQAM Optical Communication System

Linear Regression vs. Deep Learning for Signal Quality Monitoring in Coherent Optical Systems

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