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Space-frequency modulation method for anti-interference 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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  • 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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  • Space-frequency modulation method for anti-interference digital television ground broadcasting transmitter
  • Space-frequency modulation method for anti-interference digital television ground broadcasting transmitter

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Embodiment Construction

[0039] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] According to the embodiment of the single frequency network transmitter (assuming that there are N transmitters in the single frequency network) of the digital TV terrestrial broadcasting transmitter space-frequency modulation method based on the embedded training sequence and LDPC coding proposed by the present invention, as figure 1 shown, follow these steps:

[0041] 1) The network data manager of the single frequency network forms the FFT coded data block (the length (number of symbols) of the FFT coded data block) of the input data bit stream on the frequency domain through LDPC encoding; when X is 512, the corresponding The length K (number of sub-carriers) of the FFT coded data block is 2048, and the frequency interval of the corresponding sub-carriers is 4KHz; when X is 1024, the length K (number of sub-carriers) of the correspo...

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Abstract

The invention discloses a space frequency modulation method for digital TV terrestrial broadcasting transmitter based on embedding training sequence and LDPC coding comprising: 1) coding input bit stream by LDPC and forming coding data block on frequency domain; 2) then demodulating by space-frequency coder and regulating time for synchronization; 3) converting data block after space-frequency modulation to time domain discrete data sample value block via IFFT; 4) training sequence serving as real part, service index sequence serving as imaginary part sequence, constituting discrete sample value block of plural training sequence; 5) repeating continuously the plural training sequence four times to form discrete sample value block of time domain embedded training sequence; 6) superposing the space-frequency modulated time domain discrete data sample value block and time domain embedding training sequence discrete sample value block to form space-frequency modulated time domain embedded training sequence data block; 7) inserting cyclic prefix as protective interval and forming signal frame; 8) pulse shaping to signal frame using square root raised consine roll-off filter; 9) up-converting base band to carrier.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to an air-frequency 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 pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L1/00H04L1/06H04N5/40
Inventor 郑紫微徐铁峰聂秋华何加铭
Owner NINGBO UNIV
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