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A frame PN capturing method and device for territorial digital TV system

A terrestrial digital television and capture device technology, applied in the field of digital signal transmission, can solve problems such as high computational complexity and long capture time, and achieve the effects of simplifying circuit structure, improving capture speed, and reducing computational complexity

Inactive Publication Date: 2009-11-04
BEIHANG UNIV
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Problems solved by technology

Applying these two methods has longer capture time and higher computational complexity

Method used

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  • A frame PN capturing method and device for territorial digital TV system
  • A frame PN capturing method and device for territorial digital TV system
  • A frame PN capturing method and device for territorial digital TV system

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Embodiment Construction

[0046] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0047] The invention proposes a frame header PN capturing method and device of a terrestrial digital television system. When the receiving end of the DTMB system performs data recovery on receiving signal frames, the method of the present invention can be used to quickly capture and identify the PN mode selected by the frame header of the sending signal frame, and provide necessary steps for further synchronization, channel estimation, and demodulation of the receiver. condition. According to the characteristics of different frame headers and possible phase rotation in the DTMB system, the present invention uses FFT and IFFT group calculations to simplify time-domain correlation calculations, and then judges whether the frame header PN sequence is successfully captured by comparing the correlation peak value with the cap...

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Abstract

The invention discloses a method for capturing the frame header PN of a digital terrestrial television system. When receiving a signal frame to recover data, a digital terrestrial multimedia broadcasting (DTMB) system simplifies relevant calculation of time domain by utilizing the group calculation of FFT and IFFT and judges whether a frame header PN sequence is successfully captured or not by comparing a relevant peak and a capturing threshold. By applying the method of the invention, a PN mode selected and used by the frame header of an identification signal frame can be quickly captured so as to provide necessary conditions for the follow-up process of a receiver; the speed of relevant calculation is improved and computational complexity is reduced; meanwhile, other treatment methods and logic circuits are not required to be added when the frame header rotates in phases of PN420 and PN945 modes, thus circuit structure is simplified so as to improve the speed for capturing the frame header PN in a digital terrestrial television broadcasting transmission system.

Description

technical field [0001] The invention belongs to the field of digital signal transmission, and relates to a frame header PN sequence capture method and a device thereof, in particular to a frame header PN sequence capture technology of a terrestrial digital television system. Background technique [0002] The digital TV terrestrial broadcasting system is an important part of the national radio and television technology system. It cooperates with satellite digital TV broadcasting system, cable digital TV broadcasting system and other auxiliary systems to provide comprehensive coverage for the audience, and is an important part of the national radio and television comprehensive coverage network. Countries pay attention. [0003] In August 2006, China’s digital terrestrial television broadcasting transmission system standard GB20600-2006 (hereinafter referred to as the national standard) with independent intellectual property rights - "Digital Terrestrial Television Broadcastin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/44H04N7/24H04L1/00
Inventor 张晓林李春宇张展
Owner BEIHANG UNIV
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