Bayesian Filter-based Dynamic Joint Estimation of Carrier Frequency Offset and Linear Phase Noise for CO-OFDM Systems

Shuai Liu, Xinwei Du, Pooi Yuen Kam, Changyuan Yu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Coherent optical orthogonal frequency-division multiplexing (CO-OFDM) is a promising technique due to its high spectral efficiency and dispersion tolerance. However, CO-OFDM is sensitive to the carrier frequency offset (CFO) which is caused by the frequency difference between the transmitter laser and local oscillator, and linear phase noise (LPN) which is closely related to the laser linewidth. The existing of CFO and LPN can introduce the inter-carrier interference (ICI) and cause the rotation of constellations, thus degrade the system performance. In this paper, we propose to dynamically and jointly track and compensate the CFO and LPN by utilizing the Gaussian particle filter (GPF) and extended kalman filter (EKF). Firstly, the GPF and EKF can dynamically track the CFO and LPN in a real-time manner, thus can achieve accurate estimation result at even high phase noise variance. Secondly, GPF can successfully prevent the particle impoverishment (PI) problem of the conventional sequential importance resampling (SIR) PF, by recursively updating the mean and variance of the particles based on the weights computed from the posterior density and the designed importance sampling function. Thirdly, the joint estimation of CFO and LPN utilizes merely one OFDM symbol, which ensures the effective data transmission efficiency. Also, EKF can convert the nonlinear problem into linearity which helps to reduce the computation complexity. Simulations are carried out to verify the accuracy, robustness and efficiency of the proposed approach by considering the estimation error variance with the Cramér-Rao lower bound (CRLB), the convergence speed of the GPF and EKF, and the real-time dynamic tracking errors.

Original languageEnglish
Title of host publication2021 International Conference on Optical Instruments and Technology
Subtitle of host publicationOptical Communication and Optical Signal Processing
EditorsJian Chen, Yi Dong, Shilong Pan, Yang Qiu, Fabien Bretenaker
PublisherSPIE
ISBN (Electronic)9781510655614
DOIs
Publication statusPublished - Apr 2022
Event2021 International Conference on Optical Instruments and Technology: Optical Communication and Optical Signal Processing - Virtual, Online, China
Duration: 8 Apr 202210 Apr 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume12278
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference2021 International Conference on Optical Instruments and Technology: Optical Communication and Optical Signal Processing
Country/TerritoryChina
CityVirtual, Online
Period8/04/2210/04/22

Keywords

  • Bayesian filter
  • carrier frequency offset
  • CO-OFDM
  • Cramér-Rao lower bound
  • phase noise

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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