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

Channel estimation method and system based on cyclic correlation

A channel estimation and channel technology, applied in baseband system components, multi-frequency code systems, etc., can solve problems such as training sequence and data symbol interference, achieve the effect of maintaining cycle characteristics, reducing complexity, and avoiding interference

Active Publication Date: 2012-03-14
TSINGHUA UNIV
View PDF6 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: how to avoid interference between training sequences and data symbols in traditional TDS-OFDM systems, thereby improving the accuracy of channel estimation and reducing system complexity

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
  • Channel estimation method and system based on cyclic correlation
  • Channel estimation method and system based on cyclic correlation
  • Channel estimation method and system based on cyclic correlation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] The method and system for channel estimation based on cyclic correlation proposed by the present invention are described in detail below with reference to the drawings and embodiments.

[0040] The channel estimation method and system based on cyclic correlation of the present invention adopts multi-segment continuous repeated block training sequences, which improves the accuracy of channel estimation and reduces the complexity of system implementation. At the same time, the existing advantages of the TDS-OFDM technology can be maintained.

[0041] Such as image 3 As shown, a channel estimation method based on circular correlation according to an embodiment of the present invention includes the following steps:

[0042]S1. After the received signal is frame-synchronized, the initial position information is obtained, and according to the initial position information, the corresponding received signal is selected as the receiving training sequence;

[0043] S2. Perform...

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 channel estimation method and a channel estimation system based on cyclic correlation. The method comprises the following steps of: 1, performing frame synchronization on received signals to acquire initial position information, and selecting the corresponding received signals as a training receiving sequence according to the initial position information; 2, performing cyclic correlation operation on the training receiving sequence and a locally known training sequence to acquire a time domain channel impulse response; and 3, analyzing multipath distribution of a channel according to the time domain channel impulse response, if a selected position of the training receiving sequence is required to be adjusted, adjusting the selected position of the training sequence according to an analysis result, selecting the training receiving sequence again and returning to perform the step 2, otherwise, outputting a final channel estimation result. By the method and the system, interference between a training sequence and a data sign in the conventional time domain synchronous (TDS)-orthogonal frequency division multiplexing (OFDM) system can be avoided, the precision of channel estimation is improved and the system complexity is reduced.

Description

technical field [0001] The present invention relates to the technical field of digital signal transmission, in particular to a channel estimation method and system based on circular correlation. Background technique [0002] Orthogonal Frequency Division Multiplex (OFDM) technology has been applied in various broadband digital signal transmission systems due to its excellent ability to resist multipath interference, such as wireless local area network, wireless digital audio and Video broadcast transmission standard (Digital Television Terrestrial Broadcasting, DTTB). The OFDM technology is used in the European Digital Video Broadcasting-Terrestrial (DVB-T), the second generation DVB-T standard DVB-T2, and the Chinese terrestrial digital TV transmission standard (DigitalTelevision Multimedia Broadcast, DTMB). [0003] The traditional OFDM system uses a cyclic prefix (Cyclic-Prefix, CP) to combat inter-symbol interference (Inter-Symbol Interference, ISI) caused by multipath ...

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 张超王昭诚王劲涛王军
Owner TSINGHUA 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