Check patentability & draft patents in minutes with Patsnap Eureka AI!

Synchronization method and apparatus of DAB and T-DMB digital receiving terminal

A technology for digital receiving and synchronizing devices, which is applied in synchronizing devices, broadcast receiving circuits, digital transmission systems, etc., can solve problems such as large deviations and great impact on receiver performance, and achieve reduced pre-errors and high efficiency Applied effect

Inactive Publication Date: 2008-10-29
SICHUAN PANOVASIC TECH
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method will produce large deviations in multipath and low signal-to-noise ratio environments
The deviation of the sampling frequency has a great influence on the performance of the receiver.

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
  • Synchronization method and apparatus of DAB and T-DMB digital receiving terminal
  • Synchronization method and apparatus of DAB and T-DMB digital receiving terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] One aspect of the present invention provides a synchronization method for DAB, T-DMB digital broadcasting system receiving end, which is divided into four-layer structured steps, advancing by layer, such as figure 1 Shown:

[0031] The first layer of frequency search steps: receive digital sampling signals and perform frequency block detection to determine whether there is a DAB signal, if yes, roughly estimate the integer multiple frequency synchronization signal, and enter the next layer; if not, return if the signal exists. Frequency block detection can quickly search for signals in the frequency band. Compared with the search in the time domain, it can judge the existence of DAB signals with a higher confidence probability and reduce the processing complexity. The frequency block detection module 204 cooperates with the FFT module 203 to search the DAB frequency segment with a step size exceeding the DAB data bandwidth of 1.536M in the frequency search step to perfo...

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 synchronization technology of a digital broadcasting DAB and T-DMB system of an orthogonal frequency division multiplexing (OFDM) receiver. The technical problem needs to be solved by the invention is to provide a high effective, stable and structurized synchronization method and a synchronization device which are applicable to a receiving terminal of the DAB and T-DMB digital broadcasting system. The technical proposal adopted by the invention to solve the technical problem is that: the synchronization method and the device of the DAB and T-DMB digital receiving terminal are divided into a four-layer structurized processing base band for sampling signals layer after layer, which comprises the steps as follows: first layer frequency search, second layer synchronization rough detection, third layer synchronization capturing and fourth layer synchronization following. If each step fails, the signal sampling returns to the upper layer. The technology has the advantages of realizing highly effective application of synchronization arithmetic, reducing pre-error of each arithmetic operation, providing comparatively stable working state for the receiving terminal and having certain tolerance capacity to the reduced signal-to-noise ratio of the receiving environment.

Description

technical field [0001] The present invention relates to the synchronous technology of DAB, T-DMB system orthogonal frequency division multiplexing receiver of digital broadcasting. Background technique [0002] 1. Introduction of DAB and T-DMB: [0003] Digital Audio Broadcasting (DAB), also known as EUREKA-147, is a digital modulation method using a coded Orthogonal Frequency Division Multiplexing (OFDM) that is robust to terrestrial multipath fading, and can provide CD-quality audio playback and different types of data Business and high-quality mobile reception. Based on European DAB, Korean Digital Multimedia Broadcasting (T-DMB) modified the source and multiplexing mode on the basis of DAB, and added the ability to transmit video services. [0004] The time-domain OFDM data of DAB consists of a null symbol (Null), a phase reference OFDM symbol (PRS) and a data OFDM symbol. Each OFDM symbol contains a guard interval (GI), which is obtained by inserting the last part 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): H04L7/00H04H40/18
Inventor 谢翔杨璐
Owner SICHUAN PANOVASIC TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com