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Method and system for identifying frame header

An identification method and a header technology, which are applied in the field of frame header identification methods and systems, and can solve problems such as long delay time, calculation time, and increased complexity

Inactive Publication Date: 2010-02-03
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this traditional method is greatly affected by frequency drift. When frequency drift occurs, it not only greatly increases the calculation time and complexity required to judge the transmission mode of the transmitted PN sequence, but also reduces the delay time of the entire system. quite long

Method used

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  • Method and system for identifying frame header
  • Method and system for identifying frame header

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Embodiment Construction

[0031] For example, in the DTMB transmission system standard, a variety of transmission mode options are provided at the transmitting end. Therefore, an embodiment of the present invention provides a frame header identification method and its system, using delay correlation (delaycorrelation) operations, for possible Change (rotated) or fixed (fixed) PN sequence to carry out self-correlation operation, and obtain self-correlation cumulative value. At the same time, using the variable PN sequence between two frame symbol (frame symbol) time differences, the difference between the PN sequences is either shifted to the left or a little bit to the right (that is, one character), and the fixed delay of two frame symbols The time minus the time of one symbol (symbol), or adding the time of one symbol, performs self-correlation accumulation of the variable PN sequence, so as to determine the transmission mode of the PN sequence. Wherein, for example, the selection method of the trans...

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Abstract

The invention provides a method for identifying a frame header, which is applicable to a digital terrestrial multimedia broadcasting (DTMB) system and comprises the following steps of: firstly, receiving a packet which comprises a plurality of frames each of which comprises a header and a data extent, wherein each header corresponds to one of a plurality of transmission modes and the plurality oftransmission modes correspond to a specific sequence respectively; secondly, carrying out a correlation operation between a header of the plurality of frames and the header of a corresponding specificframe so as to generate a plurality of results corresponding to the transmission modes; and, finally, identifying the transmission mode of the header according to the plurality of results.

Description

technical field [0001] The present invention relates to a frame header identification method and system, in particular to a method and system capable of identifying the transmission mode of the frame header used in the Digital Television Terrestrial Broadcasting (DTMB) transmission system. Background technique [0002] With the rapid development of multimedia, users have more and more requirements for multimedia services. Therefore, China has formulated a digital terrestrial broadcasting (Digital Terrestrial Multimedia Broadcast, hereinafter referred to as DTMB) transmission system standard as a transmission standard for digital TV signals used in China. In the DTMB transmission system standard formulated by China, in order to provide different transmission applications of single carrier and multi-carrier, three frame headers (frame header) of different lengths have been formulated, and the lengths of 420, 595 and 945 characters are respectively used ( symbol) pseudo noise ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24
Inventor 李升龙
Owner HIMAX TECH LTD
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