Correction coding method for ground digital television broadcast

An error correction coding and codeword technology, applied in the field of error correction coding of terrestrial digital multimedia TV broadcasting, can solve the problem of insufficient structure and other problems

Active Publication Date: 2007-03-07
TSINGHUA UNIV
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Problems solved by technology

Long random LDPC codes are usually closer to the Shannon limit than equivalent structured LDPC codes, but they are not sufficiently structured, thus simplifying the encoding

Method used

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  • Correction coding method for ground digital television broadcast
  • Correction coding method for ground digital television broadcast
  • Correction coding method for ground digital television broadcast

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Embodiment Construction

[0235] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0236] The Time Domain Synchronous Orthogonal Frequency Division Multiplexing (TDS-OFDM) modulation used in Tsinghua DMB-T is a multi-carrier technology, but it is different from the coded Orthogonal Frequency Division Multiplexing (COFDM) used in European DVB-T. In TDS -In OFDM, there is no frequency domain pilot signal inserted, but a pseudo-random (PN) sequence is inserted in the time domain in the guard interval of OFDM, which is used for frame synchronization, frequency synchronization, timing synchronization, channel transmission characteristic estimation and tracking phase noise etc.

[0237] In order to achieve fast and stable synchronization, Tsinghua TDS-OFDM transmission system uses a hierarchical frame structure. The basic unit of the frame structure is called a signal frame, as shown in Figure 6. 200 / 225 signal frames are define...

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Abstract

This invention relates to earth digital television broadcast coding method in digital information transmission technique field, which comprises the following steps: diving transmission flow into 752 bit set and adding 261 zeros to get 1013 bit for BCH coding and removing front 261 bit to get BCH(762,752); forming one set of BCH(762,752) with certain number to generate matrix of LDPC(7493,3048),LDPC(7493,4572) or LDPC(7493,6096); deleting output 7493 bit front five correction bit to get final 7488 output bit.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, in particular to an error correction coding method for terrestrial digital multimedia television broadcasting. Background technique [0002] After experiencing the era of mechanical TV, electronic black-and-white TV and color TV, the Japanese broadcasting company NHK began to study high-definition TV in the early 1970s. Later, many countries and international standards organizations also actively carried out research and development in this area. But until 1990, the technical solutions adopted were all analog or mixed analog and digital solutions. On June 1, 1990, GI Corporation of the United States submitted the all-digital terrestrial HDTV standard to the American Advanced Television Advisory Committee (ACATS), and television has since entered a new era - the era of digital television. [0003] After years of unremitting research and development, many countries and reg...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N19/146H04N19/184H04N19/65
Inventor 杨林杨知行张晓林门爱东
Owner TSINGHUA UNIV
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