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Modulation method for anti-fading digital television ground broadcasting transmitter

A digital TV terrestrial and broadcast transmitter technology, applied in the field of wireless communication, can solve problems such as impractical application, not being widely used, and excessive calculation of algorithms and encoders

Inactive Publication Date: 2009-05-13
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When LDPC coding was first discovered, it was not widely used in most cases due to the computational complexity of algorithms and encoders being too large for practical application.

Method used

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  • Modulation method for anti-fading digital television ground broadcasting transmitter
  • Modulation method for anti-fading digital television ground broadcasting transmitter

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Embodiment Construction

[0037] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] According to the embodiment of a certain transmitter of the digital TV terrestrial broadcasting transmitter modulation method with time-domain training sequence and LDPC coding that the present invention proposes, as figure 1 shown, follow these steps:

[0039] 1) The digital TV terrestrial broadcasting transmitter forms an FFT coded data block (the length (the number of symbols) of the FFT coded data block) of its own input data bit stream through LDPC encoding in the frequency domain (the length (number of symbols) of the FFT coded data block is K, and K is 1024, and the corresponding sub The carrier frequency interval is 8KHz);

[0040] 2) The digital TV terrestrial broadcasting transmitter uses IFFT (Inverse Fast Discrete Fourier Transform) to transform the FFT encoded data block into a discrete encoded data sample block in the tim...

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PUM

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Abstract

The invention discloses a modulation method for digital TV terrestrial broadcasting transmitter based on time domain training sequence and LDPC coding comprising: 1) coding input bit stream by LDPC and forming FFT coding data block on frequency domain; 2) converting FFT coding data block to time domain discrete coding data sample value block via IFFT; 3) inserting cyclic prefix as protective interval to time domain discrete coding data sample block and forming time domain cyclic prefix discrete coding data sample block; 4) continuous four time domain cyclic prefix discrete coding data sample value blocks constituting a frame body; 5) training sequence serving as real part of plural training sequence, service index sequence serving as imaginary part sequence to constitute discrete sample value block of plural training sequence; 6) inserting the discrete sample value block (frame head) of plural training sequence in signal frame for forming frame body;7) pulse shaping to signal frame using square root raised consine roll-off filter; 8) up-converting base band to carrier.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to a modulation method for a digital TV terrestrial broadcasting transmitter with a time-domain training sequence and LDPC coding (Low Density Parity Check, LDPC). Background technique [0002] At present, terrestrial TV broadcasting has gradually developed from analog to digital. Digital TV terrestrial broadcasting transmission system, as an important part of digital TV terrestrial broadcasting, the development of its related technologies is closely related to people's quality of life, and therefore has received extensive attention from people. Digital TV terrestrial broadcasting related technologies and related industries are industries with rapid development and good market prospects in the field of communication and computer. In terms of technologies related to digital TV terrestrial broadcasting, countries are currently focusing on how to provide low-cost,...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L1/00H04N5/40
Inventor 郑紫微徐铁峰聂秋华何加铭
Owner NINGBO UNIV
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