Wide-Range and Fast-Tracking Non-Data-Aided Frequency Offset Estimator for QAM Optical Coherent Receivers

Tadao NAKAGAWA; Takayuki KOBAYASHI; Koichi ISHIHARA; Yutaka MIYAMOTO

doi:10.1587/transcom.2015EBP3485

Wide-Range and Fast-Tracking Non-Data-Aided Frequency Offset Estimator for QAM Optical Coherent Receivers

Tadao NAKAGAWA, Takayuki KOBAYASHI, Koichi ISHIHARA, Yutaka MIYAMOTO

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This paper describes a blind frequency offset estimator (FOE) with wide frequency range for coherent quadrature amplitude modulation (QAM) receivers. The FOE combines a spectrum-based frequency offset estimation algorithm as a coarse estimator with a frequency offset estimation algorithm using the periodogram as a fine estimator. To establish our design methodology, each block of the FOE is rigorously analyzed by using formulas and the minimum fast Fourier transform (FFT) size that generates a frequency spectrum for both the coarse and fine estimators is determined. The coarse estimator's main feature is that all estimation processes are carried out in the frequency domain, which yields convergence more than five times faster than that of conventional estimators. The estimation frequency range of the entire FOE is more than 1.8 times wider than that of conventional FOEs. Experiments on coherent optical 64-ary QAM (64-QAM) reveal that frequency offset estimation can be achieved under a frequency offset value greater than the highest value of the conventional estimation range.

Publication: IEICE TRANSACTIONS on Communications Vol.E99-B No.7 pp.1416-1425

Publication Date: 2016/07/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2015EBP3485

Type of Manuscript: PAPER

Category: Fiber-Optic Transmission for Communications

Authors

Tadao NAKAGAWA
  NTT Corporation
Takayuki KOBAYASHI
  NTT Corporation
Koichi ISHIHARA
  NTT Corporation
Yutaka MIYAMOTO
  NTT Corporation

Keyword

optical fiber communication, optical receivers, quadrature amplitude modulation, digital signal processing, frequency offset estimation

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Tadao NAKAGAWA, Takayuki KOBAYASHI, Koichi ISHIHARA, Yutaka MIYAMOTO, "Wide-Range and Fast-Tracking Non-Data-Aided Frequency Offset Estimator for QAM Optical Coherent Receivers" in IEICE TRANSACTIONS on Communications, vol. E99-B, no. 7, pp. 1416-1425, July 2016, doi: 10.1587/transcom.2015EBP3485.
Abstract: This paper describes a blind frequency offset estimator (FOE) with wide frequency range for coherent quadrature amplitude modulation (QAM) receivers. The FOE combines a spectrum-based frequency offset estimation algorithm as a coarse estimator with a frequency offset estimation algorithm using the periodogram as a fine estimator. To establish our design methodology, each block of the FOE is rigorously analyzed by using formulas and the minimum fast Fourier transform (FFT) size that generates a frequency spectrum for both the coarse and fine estimators is determined. The coarse estimator's main feature is that all estimation processes are carried out in the frequency domain, which yields convergence more than five times faster than that of conventional estimators. The estimation frequency range of the entire FOE is more than 1.8 times wider than that of conventional FOEs. Experiments on coherent optical 64-ary QAM (64-QAM) reveal that frequency offset estimation can be achieved under a frequency offset value greater than the highest value of the conventional estimation range.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2015EBP3485/_p

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@ARTICLE{e99-b_7_1416,
author={Tadao NAKAGAWA, Takayuki KOBAYASHI, Koichi ISHIHARA, Yutaka MIYAMOTO, },
journal={IEICE TRANSACTIONS on Communications},
title={Wide-Range and Fast-Tracking Non-Data-Aided Frequency Offset Estimator for QAM Optical Coherent Receivers},
year={2016},
volume={E99-B},
number={7},
pages={1416-1425},
abstract={This paper describes a blind frequency offset estimator (FOE) with wide frequency range for coherent quadrature amplitude modulation (QAM) receivers. The FOE combines a spectrum-based frequency offset estimation algorithm as a coarse estimator with a frequency offset estimation algorithm using the periodogram as a fine estimator. To establish our design methodology, each block of the FOE is rigorously analyzed by using formulas and the minimum fast Fourier transform (FFT) size that generates a frequency spectrum for both the coarse and fine estimators is determined. The coarse estimator's main feature is that all estimation processes are carried out in the frequency domain, which yields convergence more than five times faster than that of conventional estimators. The estimation frequency range of the entire FOE is more than 1.8 times wider than that of conventional FOEs. Experiments on coherent optical 64-ary QAM (64-QAM) reveal that frequency offset estimation can be achieved under a frequency offset value greater than the highest value of the conventional estimation range.},
keywords={},
doi={10.1587/transcom.2015EBP3485},
ISSN={1745-1345},
month={July},}

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TY - JOUR
TI - Wide-Range and Fast-Tracking Non-Data-Aided Frequency Offset Estimator for QAM Optical Coherent Receivers
T2 - IEICE TRANSACTIONS on Communications
SP - 1416
EP - 1425
AU - Tadao NAKAGAWA
AU - Takayuki KOBAYASHI
AU - Koichi ISHIHARA
AU - Yutaka MIYAMOTO
PY - 2016
DO - 10.1587/transcom.2015EBP3485
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E99-B
IS - 7
JA - IEICE TRANSACTIONS on Communications
Y1 - July 2016
AB - This paper describes a blind frequency offset estimator (FOE) with wide frequency range for coherent quadrature amplitude modulation (QAM) receivers. The FOE combines a spectrum-based frequency offset estimation algorithm as a coarse estimator with a frequency offset estimation algorithm using the periodogram as a fine estimator. To establish our design methodology, each block of the FOE is rigorously analyzed by using formulas and the minimum fast Fourier transform (FFT) size that generates a frequency spectrum for both the coarse and fine estimators is determined. The coarse estimator's main feature is that all estimation processes are carried out in the frequency domain, which yields convergence more than five times faster than that of conventional estimators. The estimation frequency range of the entire FOE is more than 1.8 times wider than that of conventional FOEs. Experiments on coherent optical 64-ary QAM (64-QAM) reveal that frequency offset estimation can be achieved under a frequency offset value greater than the highest value of the conventional estimation range.
ER -