Frame-synchronization generation method and its device in the ground digital TV system

Abstract

The invention provides a terrestrial digital television broadcasting transmission system in the frame synchronization method for the selection and installation, a digital information processing areas, characterized lies: This invention provides a three length of the header, PN420, PN595 and PN945. PN420 and PN945 from eight bands and nine bands have a linear feedback shift register, and the need for expansion cycle, PN595 and 10 bands have a linear feedback shift register sequence truncated sequence. Depending on the model chosen, it will be a corresponding model PN header inserted into the frame of the sequence data before forming signal frame. When choosing PN420 or PN945 mode, the header of each signal frame required a certain phase of the rotation, and PN595 mode, each signal frames header were the same. PN header which is used to establish synchronization, channel estimation and balanced. Short synchronous time, simple channel estimation, high quality of receiver performance characteristics can be got by using it.

Description

technical field [0001] The invention relates to the field of digital information transmission, in particular to a frame synchronization technology in a terrestrial digital television system. Background technique [0002] The development of the TV industry and business has always been centered around the improvement of viewing quality and service capabilities. As a new generation of TV technology, digital TV has greatly improved its viewing quality; at the same time, the adoption of digital technology has created more opportunities for other services. Expansion capacity. The development of digital TV will be of great significance to the development of the entire electronic information industry. [0003] The terrestrial digital TV broadcasting system is an important part of the broadcasting TV system. It cooperates with satellite digital TV broadcasting system, cable digital TV broadcasting system and other auxiliary systems to provide comprehensive audience coverage, and is...

AI Technical Summary

Problems solved by technology

The ATSC standard is designed for fixed reception. In order to pursue high spectrum utilization, the data frame structure block is relatively large, so it is difficult for channel estimation and equalization to track the time-varying channel. It cannot support mobile reception and can only support fixed reception.

The DVB-T standard was originally designed for fixed reception, but it can support mobile reception due to the application of frequency domain continuous pilots and scattered pilots. The disadvantage is that the signal re-entry and re-synchronization time is long, which has a certain degree of mobile reception influences

At the same time, due to the frequency domain scattered pilot and continuous pilot will occupy the effective data bandwidth, reducing the data transmission rate of the system

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