Method for making synchronization by utilizing time domain spread spectrum beacon in digital video broadcast

A technology of digital video broadcasting and time domain, which is applied to color TV components, TV system components, TVs, etc., and can solve problems such as poor estimation accuracy, long user interruption period, and affecting user satisfaction

Inactive Publication Date: 2004-07-28
TIMI TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The estimation accuracy of time and frequency of this synchronization mechanism is poor, and the synchronization time is long. Although the slow synchronization speed may be acceptable when the user turns on the machine, if it takes a long time to...

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  • Method for making synchronization by utilizing time domain spread spectrum beacon in digital video broadcast
  • Method for making synchronization by utilizing time domain spread spectrum beacon in digital video broadcast
  • Method for making synchronization by utilizing time domain spread spectrum beacon in digital video broadcast

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Embodiment Construction

[0009] figure 1 An embodiment of the structure of the spread spectrum beacon in the present invention and the corresponding signal frame structure are described.

[0010] The spread spectrum beacon here includes long sync and short sync symbols: the long sync consists of two identical spreading sequences, dedicated to fast time and frequency acquisition; the short sync consists of several spread symbols, carrying certain key The system parameters of , and are used to fine estimate the residual frequency offset and compensate the non-ideal characteristics of the hardware.

[0011] In order to achieve fast synchronization in the receiver, the acquisition of time and frequency is the premise of all other operations and should have the highest robustness (robustness). For this reason, the long synchronous design in the present invention has the following characteristics:

[0012] 1. Compared with short synchronization, long synchronization has higher spreading gain to ensure hig...

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Abstract

The invention provides a kind of method for carrying on quick and reliable synchronization by using time region frequency expansion signal mark in digital video broadcast, the signal mark includes long synchronization and the short synchronization signs: the long one is used in quick time and frequency capture, the short one is used in the precise estimation of residual deviation, I/Q unbalanced and other hardware nonideal characteristics. Some important system parameter such as FFT block length and the protection interval length are coded in the short synchronization sign in order to support variant system work mode.

Description

technical field [0001] The invention relates to a synchronization method using time-domain spread spectrum beacons in digital video broadcasting. Background technique [0002] In the current DVB-T (European Digital Broadcasting System) standard, there is no training sequence dedicated for synchronization. The initial time and frequency acquisition of the system is usually obtained by exploiting the repetitive nature of OFDM (Orthogonal Frequency Division Multiplexing) data symbols and cyclic prefix. The estimation accuracy of time and frequency of this synchronization mechanism is poor, and the synchronization time is long. Although the slow synchronization speed may be acceptable when the user turns on the machine, if it takes a long time to re-synchronize, it will affect the user's satisfaction. For example, when a mobile receiver loses synchronization in a deep fading area, and tries to re-establish the connection after leaving the fading area, the user will experience a...

Claims

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Application Information

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IPC IPC(8): H04N5/04H04N7/015
Inventor 邢观斌沈漫源刘辉王联杨庆华
Owner TIMI TECH
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