Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A Sliding Window Based Co-ofdm Optical Phase Noise Estimation and Compensation Method

A CO-OFDM and noise estimation technology, which is applied in the field of CO-OFDM optical phase noise estimation and compensation based on sliding windows, can solve the problems of limiting the overall performance of the CO-OFDM system, reducing the effective rate and spectrum utilization of the system, and increasing the pilot frequency Quantity and other issues, to achieve the effect of reducing costs, reducing line width requirements, and improving accuracy

Active Publication Date: 2017-11-03
SOUTH CHINA NORMAL UNIVERSITY
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the set performance index, this method needs to increase the number of pilots, thereby reducing the effective rate and spectrum utilization of the system;
[0006] (2) In the case of large optical phase noise, the estimation error of the phase noise estimation scheme of a single CO-OFDM symbol is large, which seriously limits the overall performance of the CO-OFDM system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Sliding Window Based Co-ofdm Optical Phase Noise Estimation and Compensation Method
  • A Sliding Window Based Co-ofdm Optical Phase Noise Estimation and Compensation Method
  • A Sliding Window Based Co-ofdm Optical Phase Noise Estimation and Compensation Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The method of the invention mainly relates to the problem of signal processing at the receiving end of a coherent optical orthogonal frequency division multiplexing system (CO-OFDM). In this embodiment, the pilot frequency is used in the CO-OFDM receiver module to estimate the common phase noise of each CO-OFDM symbol, so the signal data frame structure at the CO-OFDM transmitter is as follows image 3 shown.

[0049] Combine below figure 1 and figure 2 , the steps of a method for estimating and compensating CO-OFDM optical phase noise based on a sliding window in this embodiment are described in detail.

[0050] S101: The receiving end performs serial-to-parallel conversion on the received signal.

[0051] S102: Remove the cyclic prefix.

[0052] S103: Transform the time-domain signal into a frequency-domain signal by using Fast Fourier Transform (FFT).

[0053] S104: Extract a training sequence used for channel estimation, and complete channel estimation.

[00...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention discloses a method for estimating and compensating CO-OFDM optical phase noise based on a sliding window. After IFFT transformation of the signal, the hypothetical "transmitter" time-domain signal is obtained; each CO-OFDM symbol is estimated by using the hypothetical "transmitter" time-domain signal and the "receiver" time-domain signal polluted only by optical phase noise The time-domain value of the optical phase noise in the time domain, and then use the time-domain sliding window to perform sliding average processing on the optical phase noise of each time-domain sample, and finally perform optical phase noise compensation processing on each CO-OFDM symbol in the time domain. This method can track the change of optical phase noise, improve the accuracy of optical phase noise estimation and the performance of the entire optical communication system. The application of the system in the next generation high-speed optical communication network has great significance.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a method for estimating and compensating CO-OFDM optical phase noise based on a sliding window. Background technique [0002] Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM), as a multi-carrier coherent optical communication technology, has attracted extensive attention of scholars in recent years. Compared with single-carrier coherent optical communication technology, CO-OFDM can achieve higher spectral efficiency, more flexible spectrum usage, more efficient channel equalization and higher spectrum scalability. Although the CO-OFDM technology has many advantages mentioned above, there are still some technical challenges in its application in the optical fiber communication system. Among them, a major defect of the CO-OFDM system is that it is extremely sensitive to optical phase noise. [0003] In order to suppress the influence of optical ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 洪学智洪晓建何赛灵
Owner SOUTH CHINA NORMAL UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com