Method for correcting Doppler frequency difference of high speed moving body

A Doppler frequency difference and correction method technology, which is applied in the field of Doppler frequency difference correction for high-speed moving objects, can solve the problems that the soft handover process cannot be triggered, affects the measurement performance of the terminal, and the communication equipment cannot be used normally, etc.

Inactive Publication Date: 2009-03-04
泉州泽仕通科技有限公司
View PDF4 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the speed of high-speed trains has reached more than 300 km/h, and even reached more than 500 km/h; the speed of aircraft has reached 800 to 1000 km/h. The device is not working properly
The impact of the Doppler effect on soft handover is that it will affect the measurement performance of the same frequency adjacent cell of the terminal. As the frequency offset increases, the measurement performance of the user terminal also decreases. When the frequency offset exceeds a certain threshold, The soft handover process will not be triggered
For the

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
  • Method for correcting Doppler frequency difference of high speed moving body
  • Method for correcting Doppler frequency difference of high speed moving body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Referring to Fig. 1 and Fig. 2, the embodiment discloses a method for correcting Doppler frequency difference of a high-speed moving body. The method realizes the correction of Doppler frequency difference between the fixed end and the mobile end by adopting two module designs of the fixed end and the mobile end. Purpose.

[0011] The fixed-end module includes near-end duplexer, LNA, frequency conversion, combiner, power amplifier, remote duplexer, reference VC0, pilot signal source and CPU, among which near-end duplexer, LNA, frequency selection The frequency conversion, combiner, power amplifier and near-end duplexer output are connected to the input in sequence, the CPU is connected to the reference VC0 and the input of the pilot signal source, and the output of the pilot signal is connected to the combiner. It is used for the transmission of the downlink carrier frequency signal at the fixed end, and the pilot signal is superimposed on the transmitted carrier freque...

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 high-speed moving body Doppler frequency difference correction method which comprises downward frequency difference correction and upward frequency difference correction; wherein, the downward frequency difference correction corrects the Doppler frequency difference of a carrier frequency signal by superposing a pilot signal generated by a standard VCO in a downward carrier frequency signal and detecting the frequency difference of the pilot signal at a mobile terminal; by detecting the frequency difference of the downward pilot signal and pre-superposing the Doppler frequency difference in the carrier frequency signal at the mobile terminal, the upward frequency difference correction corrects an upward signal g received at a fixed terminal due to Doppler frequency shift. The whole correction method evades the changes of an arrival angle and the speed of the mobile terminal, the correction is accurate and timely, and the communication quality is guaranteed to be stable and reliable.

Description

technical field [0001] The invention relates to a mobile communication transmission method, in particular to a Doppler frequency difference correction method for a high-speed moving body. Background technique [0002] At present, the speed of high-speed trains has reached more than 300 km / h, and even reached more than 500 km / h; the speed of aircraft has reached 800 to 1000 km / h. The device is not functioning properly. The impact of the Doppler effect on soft handover is that it will affect the measurement performance of the same frequency adjacent cell of the terminal. As the frequency offset increases, the measurement performance of the user terminal also decreases. When the frequency offset exceeds a certain threshold, The soft handoff process will not be triggered. For the mobile communication users in the high-speed mobile body, the signal frequency they receive is f=fo±△f (fo is the base station frequency, △f is the frequency difference, where ), because the high-sp...

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): H04B7/01H04B1/707H04L27/00H03J7/02
Inventor 林志华
Owner 泉州泽仕通科技有限公司
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