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Interference resistant modulation method for digital television terrestrial broadcast transmitter

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

Inactive Publication Date: 2009-04-29
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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  • Interference resistant modulation method for digital television terrestrial broadcast transmitter
  • Interference resistant modulation method for digital television terrestrial broadcast 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 based on embedded training sequence and LDPC coding proposed by the present invention, as figure 1 shown, follow these steps:

[0039] 1) This certain digital TV terrestrial broadcasting transmitter forms FFT coded data block (the length (number of symbols) of FFT coded data block) is K with its input data bit stream through LDPC code in frequency domain; When X takes 512 , the length K (number of subcarriers) of the corresponding FFT encoded data block is 2048, and the frequency interval of the corresponding subcarriers is 4KHz; when X is 1024, the length K (number of subcarriers) of the corresponding FFT encoded data block ) is 4096, and the frequency interval of the corresponding subcarrier is 2KHz; when X is...

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Abstract

The present invention discloses a method for modulating digital television ground broadcasting transmitter based on insertion training sequence and LDPC code, wherein the method comprises the following steps: 1) forming an FFT coded data block with the input bit flow through LDPC coding; 2) switching the FFT coded data block to a time domain discrete coded data sample block through IFFT; 3) forming a complex training sequence discrete sample block with a mode that a training sequence is used as a real part sequence and an operational indicator sequence is used as an imaginary part sequence; 4) continuously repeating the complex training sequence for four times to form a time domain insertion training sequence discrete sample block; 5) directly overlapping the time domain discrete coded data sample block with the time domain insertion training sequence discrete sample block for forming a time domain insertion training sequence coded data block; 6) inserting a circulating prefix into the time domain insertion training sequence coded data block for forming a signal frame; 7) forming a signal frame pulse with a square-root raised cosine roll-off filter; and 8) upconverting the baseband signal to the 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 based on embedded training sequences and LDPC codes (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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Patent Type & Authority Applications(China)
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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