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Frame sync. generating method in ground digital multimedia TV brodcast system

A technology of television broadcasting and terrestrial digital, applied in the field of digital information transmission

Inactive Publication Date: 2003-12-17
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, COFDM uses an iterative approximation algorithm, so there is a problem of convergence error and convergence time

Method used

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  • Frame sync. generating method in ground digital multimedia TV brodcast system
  • Frame sync. generating method in ground digital multimedia TV brodcast system
  • Frame sync. generating method in ground digital multimedia TV brodcast system

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Embodiment Construction

[0058] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0059] The baseband frame synchronization signal consists of a preamble, a PN sequence and a postamble. The preamble can be defined as 0, 24, and 25 symbols, the postamble can be defined as 1, 25, and 104 symbols, and the PN sequence has 255 symbols. For different signal frames in a signal frame group, there are different frame synchronization signals. Therefore, the frame sync can be used for identification as a frame sync feature of a particular signal frame. Preamble and postamble are defined as cyclic extensions of the PN sequence.

[0060] The PN sequence is defined as an 8-order m-sequence implemented by a Fibonacci-type linear feedback shift register (LFSR). Its characteristic polynomial is defined as x 8 +x 6 +x 5 +x+1. A block diagram of the LFSR is shown in Figure 2. The initial condition module determines the phase of the ge...

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Abstract

A method for producing frame synchronization in ground digital multimedia television broadcast system, of which the frame synchronization signal is composed of a front synchronization, a PN series and a back synchronization, includes steps as: (1) to create a eight steps m series by Fibonacci type linear feed-back shift register, (2) to select a sixteen steps Wolsch code word by DMB-T network supervisor as a base station (emission station), (3) to expand the sixteen bit Wolsh code to a vector of 256 / 304 / 384 position by duplicating each, "1" and each "0" 16 / 19 / 24 times according to the big or small or front synchronization / back synchronization in PN series, (4) to carry out one position by one position exclusive OR (XOR) to the vector produce by step (2) and the frame synchronization series to be coded to establish the frame synchronization series of Wolsh spread spectrum coding.

Description

[0001] This application is a divisional application of "Terrestrial Digital Multimedia Television Broadcasting System" with application number 00123597.4 filed on August 25, 2000. technical field [0002] The invention belongs to the field of digital information transmission, and more specifically relates to a method for generating frame synchronization in a terrestrial digital multimedia television broadcasting system. Background technique [0003] For the TV transmission system, on the basis of analog TV, after more than ten years of unremitting research and development, Digital Television Terrestrial Broadcasting (DTTB) has achieved many achievements and reached the stage of realization. Since November 1998, DTTB programs have been broadcast in North America and Europe, and many countries have announced their DTTB system selection and implementation plans. Currently, there are three main DTTB transmission standards in the world: [0004] 1) ATSC (Advanced Television Syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/06H04N5/06
Inventor 杨林杨知行
Owner TSINGHUA UNIV
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