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

Power-adjustable partially-superimposed training sequence-based time synchronization system and method for optical orthogonal frequency division multiplexing (OFDM) system

A technology of time synchronization system and training sequence, which is applied in the field of optical communication, can solve the problems of data information interference, limited length of cyclic prefix, occupation, etc., and achieve good robustness

Active Publication Date: 2013-06-12
ANSHAN ZHUOYUE GUANGWEI TECH CO LTD
View PDF4 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: in the existing superimposed training sequence time synchronization method, if the training sequence is only superimposed on the OFDM cyclic prefix, because the length of the cyclic prefix is ​​limited, the accuracy of time synchronization is not high; if training The sequence is superimposed on the entire symbol data of the OFDM symbol, because the training sequence occupies part of the energy originally allocated to the OFDM symbol data, so it will cause great interference to the data information

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
  • Power-adjustable partially-superimposed training sequence-based time synchronization system and method for optical orthogonal frequency division multiplexing (OFDM) system
  • Power-adjustable partially-superimposed training sequence-based time synchronization system and method for optical orthogonal frequency division multiplexing (OFDM) system
  • Power-adjustable partially-superimposed training sequence-based time synchronization system and method for optical orthogonal frequency division multiplexing (OFDM) system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0024] figure 1It is a block diagram of a single-mode fiber OFDM system with intensity modulation direct detection (IM / DD). The IM / DD single-mode fiber OFDM system is mainly composed of four modules: RF OFDM transmitter, RF-to-optical up-converter, optical-to-RF down-converter and RF OFDM receiver. Because radio-frequency devices are more mature than corresponding optical devices, this system places most of the required signal processing in the radio-frequency domain.

[0025] figure 2 It is a block diagram of the optical OFDM system after adding the time synchronization scheme of the present invention to the above system, that is, a block diagram of the time synchronization method of the optical OFDM system with adjustable power and partially superimposed training sequences. exist figure 1 On the basis of the method, a superposition training s...

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 relates to a power-adjustable partially-superimposed training sequence-based time synchronization system and a power-adjustable partially-superimposed training sequence-based time synchronization method for an optical orthogonal frequency division multiplexing (OFDM) system, and relates to the technical field of optical communication. A novel superimposed training sequence-based time synchronization method aims to overcome the shortcomings of low synchronization performance of the conventional optical OFDM system and great interference with transmission data, and cyclic prefix information is fully used for acquiring synchronization information. A training sequence is linearly superimposed onto the latter L sampling points of an OFDM symbol and a cyclic prefix under the condition that the length L of the cyclic prefix is determined, so that the shortcoming of interference with the data during the superimposition of a long sequence is overcome. The method is high in time synchronization accuracy, the interference to OFDM data is small, and a training sequence superimposition power allocation factor can be selected more flexibly.

Description

technical field [0001] The invention belongs to the technical field of optical communication, in particular to an optical OFDM system time synchronization method for superimposing training sequences. technical background [0002] In the past 20 years, OFDM technology has been widely studied in the field of radio frequency, and because of its advantages such as effective use of bandwidth, reduction of interference and resistance to multipath effects, it is widely used in wireless local area networks, digital audio broadcasting, digital video, etc. Broadcasting, fourth-generation mobile communication technology and other fields. The optical OFDM system is a new type of communication system, which combines the dual advantages of optical fiber communication technology and OFDM technology, and utilizes the good robustness of OFDM to optical fiber channel dispersion in optical communication, which has higher spectral efficiency and Technical features such as faster transmission r...

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): H04L27/26
CPCH04L27/2613H04L27/26134
Inventor 王汝言王钦波赵辉戈勇华吴大鹏
Owner ANSHAN ZHUOYUE GUANGWEI TECH CO LTD
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