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A Phase Noise Compensation Method for Large Linewidth Co-ofdm System

A technology of CO-OFDM and phase noise compensation, which is applied in the field of phase noise compensation of large-linewidth CO-OFDM systems, and can solve problems such as poor phase noise equalization effect

Active Publication Date: 2019-11-05
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0007] The main purpose of the present invention is to overcome the poor effect of phase noise equalization in the existing method, and propose a traceless Phase Noise Compensation Method of Kalman Filter (UKF)

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  • A Phase Noise Compensation Method for Large Linewidth Co-ofdm System
  • A Phase Noise Compensation Method for Large Linewidth Co-ofdm System
  • A Phase Noise Compensation Method for Large Linewidth Co-ofdm System

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Embodiment Construction

[0149] The present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0150] refer to Figure 2 to Figure 9 , a large-linewidth CO-OFDM system phase noise compensation method based on time-domain unscented Kalman filtering, which mainly involves signal processing at the receiving end of a coherent optical orthogonal frequency division multiplexing CO-OFDM system. Refer to the CO-OFDM system in the background technology A detailed description of the OFDM system structure.

[0151] Such as figure 1 As shown, the CO-OFDM system includes a CO-OFDM system transmitter module 101, a CO-OFDM optical modulation module 102, an optical fiber transmission module 103, a photoelectric detection module 104, and a CO-OFDM system receiver module 105. The signal generated by the system transmitter The up-conversion of optical modulation becomes the CO-OFD...

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Abstract

The invention provides a phase noise compensation method suitable for large line width and high order modulation CO-OFDM system. The method comprises the following steps: performing channel equalization on training symbol data of a receiving terminal after performing Kalman filter on the same in the frequency domain; setting pilot frequency subcarrier data with certain intervals for each OFDM symbol on a transmitting terminal, and performing preset CPE phase noise estimation and compensation at pilot frequency subcarriers in the frequency domain based on extended Kalman filter (EKF); and finally, converting frequency domain data subjected to CPE phase noise compensation into the time domain, and realizing blind ICI phase noise compensation by using the Avg-BL method, then performing pre- judgment, converting the frequency domain data subjected to the judgment into the time domain, applying time domain data and original time domain data of the receiving terminal to time domain unscented Kalman filter, calculating a final phase noise compensation value, and performing compensation. By adoption of the phase noise compensation method, a better phase noise equalization effect is obtained, and the spectrum utilization rate of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of optical communication networks, and in particular relates to a phase noise compensation method of a CO-OFDM system with a large line width. Background technique [0002] Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) transmission technology is formed by combining the electrical domain Orthogonal Frequency Division Multiplexing (OFDM) modulation technology in the coherent optical communication system, which has the advantages of optical fiber dispersion and Polarization mode dispersion has good suppression effect, the ability to flexibly compensate system damage by digital signal processing, and high spectrum utilization. It has become one of the technologies that have attracted much attention in the fields of long-distance high-speed communication systems and optical access networks. [0003] CO-OFDM system structure such as figure 1 As shown, it can be divided into five modules ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/2513H04B10/61H04L27/26
CPCH04B10/2513H04B10/6165H04L27/2602H04L27/264
Inventor 董月军唐英杰任宏亮卢瑾乐孜纯
Owner ZHEJIANG UNIV OF TECH
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