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

Carrier synchronization method applied to orthogonal frequency division multiplexing system

A technology of orthogonal frequency division and carrier synchronization, applied in multi-frequency code systems, baseband system components, etc., can solve the problems of small carrier frequency offset estimation range and large hardware overhead, and achieve small estimated mean square error and low complexity degree, the effect of good performance

Active Publication Date: 2014-11-26
SOUTHEAST UNIV
View PDF8 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of these algorithms are limited to a specific training sequence, and some carrier frequency offset estimates have a small range
Moreover, the previous algorithm requires a large number of multiplication and addition operations for each estimation, and the hardware overhead is very large.

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
  • Carrier synchronization method applied to orthogonal frequency division multiplexing system
  • Carrier synchronization method applied to orthogonal frequency division multiplexing system
  • Carrier synchronization method applied to orthogonal frequency division multiplexing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The technical solution of the present invention will be further explained below in conjunction with the accompanying drawings.

[0032] The invention includes five parts: generating training sequence and storing phase information, coarse carrier frequency offset estimation, fine carrier frequency offset estimation, total carrier frequency offset calculation and carrier frequency offset compensation.

[0033] like figure 1 As shown, first, the training sequence B(k) is cyclically shifted by d bits, and then the sequence after the cyclic shift is correlated with the original training sequence to obtain the shifted correlation sequence C(k), and the sequence C( For the phase information θ(k) of k), the value in θ(k) is stored in a register with a length of N bits, and the specific method is as follows:

[0034] 1, in order to reduce storage capacity and the impact of timing error on carrier synchronization in the present invention, the training sequence that takes is as f...

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 a carrier synchronization method applied to an orthogonal frequency division multiplexing system. The method includes the following steps that firstly, a transmitting module of the OFDM system transmits a training sequence used for carrier frequency offset estimation before effective OFDM symbols; secondly, according to phase information of a first-group displacement correlation sequence of the received training sequence, coarse carrier frequency offset estimation is conducted; thirdly, according to phase information of a second-group displacement correlation sequence of the received training sequence, fine carrier frequency offset estimation is conducted; fourthly, according to a coarse carrier frequency offset estimation value and a fine carrier frequency offset estimation value, a total carrier frequency offset estimation value is acquired; fifthly, according to the total carrier frequency offset estimation value, carrier frequency offset compensation is conducted. According to the carrier synchronization method, without dependence on the special structure of the training sequence, high estimation performance and low complexity can be achieved, an algorithm has the wide estimation range and the small estimation mean square errors, and good performance is achieved on a Gaussian white noise channel and a multi-path fading channel.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a carrier synchronization method applied in an orthogonal frequency division multiplexing system. Background technique [0002] With the increasing demand for mobile communications and wireless networks, more advanced wireless transmission technologies are increasingly required. One of the most immediate challenges in the design of high-speed wireless communication systems is to overcome the severe frequency-selective fading brought about by wireless channels. Orthogonal frequency division multiplexing (hereinafter referred to as: OFDM) technology can well overcome the frequency selective fading of wireless channels. Due to its high-efficiency transmission characteristics, OFDM has become one of the core technologies for realizing future high-speed wireless communication. [0003] Because OFDM technology has the advantages of anti-frequency selective f...

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 Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 张萌闫成刚黄成李保申钟景川刘俊郭仲亚陈子洋庞伟
Owner SOUTHEAST UNIV
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