Novel time domain cubature Kalman phase noise compensation scheme for coherent optical OFDM system

A phase noise compensation and phase noise technology, applied in the field of novel time-domain volumetric Kalman phase noise compensation scheme, can solve problems such as unstable results, deviation from the true value, large linearization error, etc., and achieve computational complexity and bit error rate The effect of good, phase noise compensation performance improvement, computational complexity and bit error rate balance

Active Publication Date: 2019-04-26
CHONGQING UNIV OF POSTS & TELECOMM
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However, the EKF algorithm uses the first-order Taylor series expansion to approach the real value, which will bri

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  • Novel time domain cubature Kalman phase noise compensation scheme for coherent optical OFDM system
  • Novel time domain cubature Kalman phase noise compensation scheme for coherent optical OFDM system
  • Novel time domain cubature Kalman phase noise compensation scheme for 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 scheme 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 gain. ...

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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 cubature Kalman phase noise compensation algorithm scheme. According to the scheme,firstly, by utilizing pilot frequency information, CPE phase noise is compensated through extended Kalman and linear interpolation algorithms; a signal after first-order compensation of the phase noise is pre-judged; and then sub-symbol processing is carried out on the pre-judged signal in a time domain. In combination with a time domain signal after the sub-symbol processing, a capacity Kalman phase noise compensation algorithm is carried out on judged data in the time domain to achieve fine compensation of ICI phase noise. The data after the fine compensation is subjected to iterative operation, so that the compensation effect is improved. Simulation analysis shows that when the line width of the phase noise is relatively large, the novel time domain cubature Kalman algorithm can effectively enhance the compensation effect on the ICI phase noise, so that the tolerance of the CO-OFDM system on the line width of a laser is improved, and the performance of the system is improved.

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 scheme. The scheme realizes the compensation of the phase noise 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 b...

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Application Information

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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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