IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS

A DD-OFDM and channel estimation technology, which is applied in the field of IM/DD-OFDM/OQAM-PON system channel estimation, can solve the problems of heavy calculation workload, achieve low complexity, reduce mean square error, and optimize the system performance effect

Pending Publication Date: 2021-11-05
XIAN UNIV OF POSTS & TELECOMM
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the ANN-based channel estimation algorithm, the neural network has three

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
  • IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS
  • IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS
  • IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0096] like figure 1 As shown, the electrical signal generated by the OFDM / OQAM transmitting end is modulated on a specific subcarrier through IFFT, and then the transmitted signal is modulated onto the optical carrier through Mach-Zehnder, and the upstream OFDM / OQAM signals of each channel are coupled into the optical fiber line transmission. After the optical signal is transmitted through a standard single-mode optical fiber, at the receiving end, the signal is received and demodulated by means of optical intensity modulation and direct detection. At the transmitter, encode the incoming binary data stream into baseband symbols a m，n , m=0, 1, 2, ..., M-1, n = 0, 1, 2, ..., N s -1 where M is the number of subcarriers, N s The number of baseband symbols. After QAM mapping, the real part and the imaginary part of the data symbol are extracted. Through IFFT transformation and prototype filter bank, the data is then converted into a serial data stream, and then the signal se...

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 invention discloses an IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS, and the method comprises the steps: firstly collecting time domain data, and carrying out the forward propagation through the time domain data; carrying out reverse propagation by using a gradient descent algorithm to continuously adjust W and b of the algorithm so as to minimize the sum of squares of errors of the whole algorithm and further obtain a transfer function (TF) of the system; and finally, carrying out channel estimation by using LS in a frequency domain. Simulation results show that when the optical fiber transmission distance is long, compared with an algorithm based on ANN channel estimation, higher CE precision can be obtained based on the ANN_LS algorithm, and better system optimization performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to an IM / DD-OFDM / OQAM-PON system channel estimation method. Background technique [0002] OFDM-PON with cyclic prefix (CP) can effectively reduce intersymbol interference (Inter Symbol Interference, ISI) and polarization mode dispersion (Polarization Mode Dispersion, PMD) induced polarization caused by dispersion (CD) in optical fiber communication systems Crosstalk between. In addition, the subcarriers in the system are orthogonal to each other, so that different frequency spectrums can be overlapped without interference, and can effectively resist Inter Carrier Interference (ICI). However, the insertion of the CP will reduce the spectrum utilization rate of the system. Aiming at the defects in the OFDM-PON system, Orthogonal Frequency Division Multiplexing / Offset Quadrature Amplitude Modulation (OFDM / OQAM) is proposed in optical communication, which is ...

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
IPC IPC(8): H04L25/02H04L27/26H04B10/2513H04B10/2569
CPCH04L25/0254H04L27/2695H04L27/2698H04B10/2513H04B10/2569
Inventor 梁思远王雪粉赵芳利赵峰
Owner XIAN UNIV OF POSTS & TELECOMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap