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A Time-Domain Volumetric Kalman Phase Noise Compensation Method in Coherent Optical Ofdm System

A phase noise compensation and phase noise technology, applied in the field of novel time-domain volume Kalman phase noise compensation, which can solve the problems of deviation from the true value, large linearization error, and unstable results.

Active Publication Date: 2021-09-14
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the EKF algorithm uses the first-order Taylor series expansion to approach the real value, which will bring a large linearization error, and sometimes cause the result to be unstable or even far away from the real value.

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  • A Time-Domain Volumetric Kalman Phase Noise Compensation Method in Coherent Optical Ofdm System
  • A Time-Domain Volumetric Kalman Phase Noise Compensation Method in Coherent Optical Ofdm System
  • A Time-Domain Volumetric Kalman Phase Noise Compensation Method in Coherent Optical Ofdm System

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[0037] The specific implementation manners and preferred simulation examples of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] 1. Combine with attached figure 2 It shows that the EKF algorithm is mostly used when compensating fine phase noise. Although the EKF algorithm can compensate the phase noise to a certain extent, it will bring a large linearization error because it uses the first-order Taylor series expansion to approximate the real value. Therefore, there is a certain error in fine phase noise compensation, but it can be better applied in compensating CPE phase noise. Therefore, the EKF of the time-domain pilot combined with linear interpolation is used to compensate the CPE phase noise in the early stage. The main idea is to input the signal before and after the pre-judgment, and obtain the estimated value of the next sampling point through the signal of the previous sampling point and the Kalman gai...

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Abstract

The invention relates to a phase noise compensation scheme of a CO-OFDM system, in particular to a novel time domain volumetric Kalman phase noise compensation algorithm scheme. In this scheme, the pilot information is firstly used to compensate the CPE phase noise through the extended Kalman and linear interpolation algorithm, and the signal after the first-order compensation of the phase noise is pre-judged, and then the pre-judged signal is sub-symbolized in the time domain. deal with. Combined with the time-domain signal after sub-symbol processing, the volumetric Kalman phase noise compensation algorithm is performed on the judged data in the time domain to realize the fine compensation of ICI phase noise. The iterative operation is performed on the finely compensated data to improve the compensation effect. Simulation analysis shows that when the phase noise line width is large, the novel time-domain volumetric Kalman algorithm of this patent can effectively enhance the compensation effect of ICI phase noise, improve the tolerance of the CO-OFDM system to the laser line width, and improve the system performance. performance.

Description

technical field [0001] The invention belongs to the technical field of phase noise compensation for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems, and relates to a novel time-domain volumetric Kalman (Cubature Kalman Filter, CKF) phase noise compensation method. This method realizes the phase noise compensation mainly through the Extended Kalman Filter (EKF) algorithm and the preprocessed time domain volumetric Kalman algorithm. Background technique [0002] Coherent Optical Orthogonal Frequency-Division Multiplexing (CO-OFDM) technology is a technology that combines OFDM technology, optical communication system and coherent detection. It has the advantages of high transmission rate, high anti-chromatic dispersion (Chromatic Dispersion, CD) and polarization mode dispersion (Polarization Mode Dispersion, PMD) capabilities, high spectral efficiency, and flexible allocation of bandwidth resources, and can effectively compensate the system by digi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/61H04L27/26H04L25/02
CPCH04B10/61H04B10/6165H04L25/021H04L25/0224H04L25/0264H04L27/2627H04L27/2695H04L27/2697
Inventor 袁建国南蜀崇刘书涵辛雪琪庞宇林金朝
Owner CHONGQING UNIV OF POSTS & TELECOMM
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