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Synchronous generation method and device for carrier in ground digital television system

A terrestrial digital TV, carrier synchronization technology, applied in the field of digital information transmission, can solve the problems of long frequency correction time, poor reception reliability, etc., achieve high signal-to-noise ratio, improve accuracy, and achieve simple effects

Inactive Publication Date: 2008-01-23
BEIHANG UNIV
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Problems solved by technology

[0006] However, when using cyclic prefix for frequency estimation, it is easily affected by channel multipath, and it is also related to timing. The frequency correction time is longer and the reception reliability is poor.

Method used

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  • Synchronous generation method and device for carrier in ground digital television system
  • Synchronous generation method and device for carrier in ground digital television system
  • Synchronous generation method and device for carrier in ground digital television system

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Embodiment Construction

[0035] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0036] Figure 3 is a multi-frame structure diagram of multi-level layers in the terrestrial digital television standard. Among them, the signal frame is the most basic structural unit. The signal frame is composed of frame header and frame body. The frame header has three modes, namely PN420, PN595 and PN945, corresponding to the signal frame length of 555.56μs, 578.7μs and 625μs respectively.

[0037] A superframe is a set of signal frames, and the time length of a superframe in different frame header modes is 125ms. Therefore, in the three modes of PN420, PN595 and PN945, a superframe contains 225, 216 and 200 signal frames respectively.

[0038]A subframe is defined as a set of superframes with a time length of 1 minute, so a subframe contains 480 superframes.

[0039] A daily frame is defined as a set of sub-frames with a time length of 24 hours ...

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Abstract

The present invention discloses a carrier wave synchronization method and the equipment for a digital television ground broadcast transmission system receiver, which belongs to the digital information processing field. The present invention is characterized in that: first of all, after the frame synchronization, the receiving terminal locally creates a PN serial which is accordant with the receiving frame head, the frequency can be estimated according to the relative results of the fore and after sub serial of the flame head, and the frequency offset signal can be compensated by passing through the loop circuit filtering. The carrier wave synchronization proposal of the present invention is suitable for the flame structures of two modes, the single carrier wave and the multi carrier wave, and at the same time the proposal has the advantages that the synchronizing speed is quick, the anti-noise performance is good, and the present invention suitable for hardware realization.

Description

technical field [0001] The invention belongs to the field of digital information transmission, and in particular relates to a carrier synchronization method 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 covera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/04H04N7/04H04N7/06
Inventor 张晓林张超张展张帅苏琳琳
Owner BEIHANG UNIV
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