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

A method and device for Doppler estimation in high-speed mobile system

A Doppler estimation, high-speed mobile technology, applied in multi-frequency code systems, baseband system components, etc., can solve the problem of negligible user equipment movement, save transmission power and battery life, increase samples, and improve performance. Effect

Active Publication Date: 2019-01-25
ALCATEL LUCENT SHANGHAI BELL CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the user equipment can move in the carriage of the train, however, considering the speed of the train, the movement of the user equipment can be ignored

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
  • A method and device for Doppler estimation in high-speed mobile system
  • A method and device for Doppler estimation in high-speed mobile system
  • A method and device for Doppler estimation in high-speed mobile system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0054] Figure 4 A flow chart of a method for Doppler estimation in a high-speed mobile system according to one aspect of the present invention is shown.

[0055] In step S401, the apparatus 1 performs channel estimation on the signals of the plurality of user equipments respectively according to the received signals received from the plurality of user equipments, so as to obtain channel estimation values ​​of the plurality of user equipments respectively. In step S402, the device 1 jointly performs Doppler estimation on the plurality of user equipments based on the channel estimation value and based on a normalized post / preprocessing method.

[0056] Here, the device 1 may be located in an eNB, for example. In the following description, eNB is sometimes taken as an example for simplicity.

[0057] It is assumed that the frequency shift is the same for all...

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 objective of the invention lies in providing a method and device for carrying out Doppler estimation in a high-speed mobile system, especially an LTE system or other systems based on the OFDM. Compared with the prior art, the method comprises the steps: respectively carrying out the channel estimation of signals of a plurality of pieces of equipment according to receiving signals from the plurality of pieces of equipment, so as to obtain channel estimation values of the plurality of pieces of equipment; and jointly carrying out the Doppler estimation of the plurality of pieces of equipment based on a normalized post-processing / pre-processing method according to the channel estimation values. The method greatly enlarges a training signal sample, and can improve the accuracy of parameter estimation through a classical theory. Meanwhile, the method meets the demands for a shorter period. A combined Doppler estimation algorithm can improve the performance of the high-speed mobile system, and has no loss. The method can increase the number of pieces of access UE of one cell. The method saves the transmission power of a single piece of user equipment, and prolongs the service life of the user equipment.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a technique for performing Doppler estimation in a high-speed mobile system. Background technique [0002] A single UE (User Equipment, user equipment) Doppler estimation method is used to obtain the frequency shift caused by the movement of the UE. [0003] In existing systems, a training signal is used to estimate a fixed or variable period. For an example of a fixed period, the channel parameter h of the nth sample at time m m (n), n=0,1,...,N-1; m=0,1,...,M-1, can be estimated by a channel estimation algorithm. If the time interval of the training signal is less than the channel coherence time, h m+1 (n) and h m The phase difference between (n) can be used for frequency shift estimation Frequency shift can be defined as: [0004] [0005] in,[] * is the conjugate operation of the complex number, arg() is the phase angle of the complex number, is the frequen...

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 Patents(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 吴涛李剑飞
Owner ALCATEL LUCENT SHANGHAI BELL 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