Data domain based frequency offset estimation and correction method and system

A technology of frequency offset estimation and correction method, applied in the field of frequency offset estimation and correction based on data domain, can solve the problems of low performance, complex algorithm process, occupation of spectrum resources, etc., to ensure consistency, improve accuracy, and reliable frequency. The effect of biased estimates

Active Publication Date: 2015-04-08
SYSU HUADU IND SCI & TECH INST +1
View PDF2 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The blind frequency offset estimation algorithm mainly uses the empty subcarrier or preamble sequence of the signal to achieve signal synchronization. Although this process does not require other operations, the algorithm process is relatively complicated and the performance is relatively low
The calculation complexity of the data-assisted frequency offset estimation algorithm is not high, and the frequency offset estimation accuracy is high, but it needs to occupy certain spectrum resources, thus reducing the effective data transmission efficiency of the system
The non-data-assisted frequency offset estimation ...

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
  • Data domain based frequency offset estimation and correction method and system
  • Data domain based frequency offset estimation and correction method and system
  • Data domain based frequency offset estimation and correction method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as figure 1 As shown, a frequency offset estimation and correction method based on the data domain includes the following steps:

[0050] S1: Perform analog-to-digital conversion on the signal received by the IEEE802.11 MIMO-OFDM system antenna to obtain a high-throughput mixed-format preamble short training sequence;

[0051] S2: Using the short training sequence of the high-throughput mixed-format preamble to estimate the signal-to-noise ratio and obtain the correlation coefficient ρ;

[0052] S3: Perform rough symbol timing synchronization and coarse frequency offset estimation and correction on the short training sequence of the high-throughput mixed-format preamble, and then perform the operation of removing the high-throughput preamble on the obtained signal to obtain the OFDM signal sequence in the high-throughput data domain ;

[0053] S4: Using the correlation coefficient ρ, finely synchronize the symbol timing of the OFDM signal sequence in the high-thr...

Embodiment 2

[0089] Such as image 3 As shown, a frequency offset estimation and correction system based on the data domain ( image 3 inside the dashed box), including:

[0090] The analog-to-digital conversion module is used to perform analog-to-digital conversion on the signal received by the antenna of the IEEE802.11 MIMO-OFDM system to obtain a high-throughput mixed-format preamble short training sequence;

[0091] The signal-to-noise ratio calculation module uses analog-to-digital conversion to obtain a high-throughput mixed-format preamble short training sequence to estimate the signal-to-noise ratio to obtain a correlation coefficient;

[0092] The symbol timing coarse synchronization module is used to calculate the symbol timing coarse synchronization by converting the analog-to-digital conversion to the short training sequence of the high-throughput mixed format preamble;

[0093] The coarse frequency offset estimation and adjustment model module is used to calculate the coarse...

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 provides a data domain based frequency offset estimation and correction method and system. The method includes S1, subjecting signals received by an IEEE802.11 MIMO-OFDM (multiple input multiple output-orthogonal frequency division multiplexing) system antenna to analog-digital conversion to obtain a high-throughput mixed-format preamble short training sequence; S2, using the high-throughput mixed-format preamble short training sequence to estimate a signal-to-noise ratio to obtain a correlation coefficient Rho; S3, subjecting the high-throughput mixed-format preamble short training sequence to symbol timing coarse synchronization and coarse frequency offset estimation and correction, and subjecting an obtained signal to removal of high-throughput preambles to obtain OFDM signal sequences of a high-throughput data domain; S4, through the correlation coefficient Rho, subjecting the OFDM signal sequences of the high-throughput data domain to symbol timing fine synchronization so as to obtain a frequency offset estimated value, and according to the frequency offset estimated value, subjecting symbols of each OFDM signal sequence to frequency offset compensation so as to finish a frequency offset estimation and correction process.

Description

technical field [0001] The present invention relates to the technical field of wireless communication frequency offset correction, in particular to a data domain-based frequency offset estimation correction method and system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM), as a multi-carrier high-efficiency modulation technology, has become the fourth-generation (4G) The core technology in the mobile communication system. The Multiple Transmit Multiple Receive (MIMO) technology has become a powerful tool to improve the uplink and downlink transmission rates. [0003] In the OFDM system, in order to improve the utilization rate of the system spectrum, the entire bandwidth of the system is divided into mutually orthogonal subcarriers. Only by ensuring the orthogonality of the subcarriers can the excellent characteristics of OFDM be guaranteed, and this orthogonality is greatly affected by the frequency offset. In the case of a large number of...

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): H04L27/26H04L27/38
CPCH04B7/0413H04L27/2656H04L27/2659H04L27/266H04L27/2663
Inventor 陆许明徐永键李潋谭洪舟
Owner SYSU HUADU IND SCI & TECH INST
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