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Constellation mapping and interweaving method and device in the digital TV system

A technology for digital TV system and constellation mapping, which is applied to components of TV systems, digital transmission systems, and components of color TVs to achieve the effect of improving error correction capabilities

Inactive Publication Date: 2007-08-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But currently there is no digital TV transmitter with 5 constellation mapping modes and 2 interleaving modes

Method used

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  • Constellation mapping and interweaving method and device in the digital TV system
  • Constellation mapping and interweaving method and device in the digital TV system
  • Constellation mapping and interweaving method and device in the digital TV system

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Embodiment Construction

[0030] As shown in FIG. 1 , the system provided by the present invention includes a selector 1 , a constellation mapping unit 2 and an interleaver 3 .

[0031] The selector 1 is a mode selector, and the selector 1 includes two parts: one part is a QAM mode selector, and the other part is an interleaving selector. If selector 1 selects 64QAM, 32QAM, 16QAM, 4QAM mode, the strobe data first passes through the mapping unit 2 and then passes through the path of the interleaver 3, otherwise it is 4QAM-NR mode, the strobe first passes through the interleaver 3 and then passes through the mapping unit 2 pathways.

[0032] The constellation mapping unit 2 stores mapping tables obtained from the constellation diagrams shown in Figs. 4, 5, 6, and 7, and the input signals are mapped into corresponding multi-bit signals through table lookup.

[0033] In digital information transmission systems, digital baseband transmission has limited bandwidth, and QAM (Quadrature Amplitude Modulation) ...

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Abstract

The related constellation mapping and interlacing method in DTV ground broadcast system is characteristics in that it supports 64QAM, 32QAM, 16QAM, 4QAM and 4QAM-NR five constellation mapping and relative interlacing implementation method. It takes group mapping according to digital signal bit flow to form nQAM (n for constellation point number) for modulation and convolution; to 4QAM-NR, first interlacing then constellation mapping. This invention improves system error correction capacity, adaptability and efficiency.

Description

technical field [0001] The invention belongs to a digital communication system, and relates to a constellation mapping and interleaving system and method in a digital television system, specifically, it mainly relates to a source error correction coding technology in a digital television ground transmission system. [0002] The invention belongs to a digital communication system, and relates to a constellation mapping and interleaving system and method in a digital television system, specifically, it mainly relates to a source error correction coding technology in a digital television ground transmission system. Background technique [0003] The biggest feature of the error correction coding system in the digital TV terrestrial transmission system is that it adopts multiple signal rates and variable constellation mapping. This requires the existence of a source coding system that can simultaneously handle multiple signal rates and multiple different constellation mappings. ...

Claims

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Application Information

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IPC IPC(8): H04N5/44H04L1/00H04L27/34H04L27/38
Inventor 张晓林张超张展苏琳琳张帅
Owner BEIHANG UNIV
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