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Data frame filling method for multi-modulation mode transmission system

A filling method and transmission system technology, which is applied to the field of data frame filling at the transmitter in the digital TV terrestrial broadcast transmission system, and can solve problems such as high system implementation complexity, low system spectrum efficiency, and inability to support mobile reception.

Active Publication Date: 2008-01-16
SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Practice shows that the ATSC system using single carrier transmission mode has the advantages of high spectrum efficiency and simple implementation, but the disadvantage is that it does not support mobile reception
The advantage of the DVB-T system and ISDB-T system using multi-carrier transmission is strong anti-interference ability, but the disadvantage is that the system has low spectrum efficiency, the system is sensitive to frequency deviation, needs to rely on GPS, and the complexity of the whole system is high

Method used

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  • Data frame filling method for multi-modulation mode transmission system
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Experimental program
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Effect test

Embodiment 2

[0101] Embodiment two assume that the frame body of each input data frame filling module includes M modulation symbols, the data symbol rate is X (symbol / second), and the data symbol rate can be 7.084MHz (symbol / second), that is, X=7.084MHz ( symbol / second), n is taken as 1, m is taken as 1, and k is taken as 0.

[0102] For the low bit rate transmission mode, the frame body of each input data frame filling module may contain 1024 modulation symbols. If time-domain processing is performed on the input data of the data frame filling module, the input data enters the system information insertion module at a symbol rate of 7.084MHz (symbol / second), and the data is output after the system information composed of 86 symbols is inserted. At this time, for the data frame filling module input of the frame body composed of 1024 symbols, the output of 1110 (that is, 1024+86) sampling points is generated. Since n=1, the sampling rate of the output is 1024 ...

Embodiment 3

[0105] Embodiment three assume that the frame body of each input data frame filling module includes M modulation symbols, the data symbol rate is X (symbol / second), and the data symbol rate can be 7.56MHz (symbol / second), that is, X=7.56MHz ( symbol / second), n is taken as 1, m is taken as 1, and k is taken as 0.

[0106] For any code rate (high code rate or low code rate) transmission mode, the frame body of each input data frame filling module can contain 3744 modulation symbols. If time-domain processing is performed on the input data of the data frame filling module, the input data enters the insertion system information module at a symbol rate of 7.56MHz (symbol / second), and the data is output after the system information composed of 36 symbols is inserted. At this time, for the data frame filling module input of the frame body composed of 3744 symbols, the output of 3780 (that is, 3744+36) sampling points is generated. Since n=1, the sampling rate of the output is ...

Embodiment 4

[0107] Embodiment 4 It is assumed that the frame body of each input data frame filling module includes M modulation symbols, and the data symbol rate is X (symbol / second). The data symbol rate may be 7.084 MHz (symbol / s), that is, X=7.084 MHz (symbol / s), n is taken as 2, m is taken as 1, and k is taken as 0.

[0108] For the low bit rate transmission mode, the frame body of each input data frame filling module may contain 1024 modulation symbols. If you choose to perform time-domain processing on the input data of the data frame filling module, the input data enters the insertion system information module at a symbol rate of 7.084MHz (symbol / s), and after inserting the system information composed of 86 symbols, the output data enters up-sampling Module, after the data is double upsampled, it will be output. At this time, for the data frame filling module input of the frame body composed of 1024 symbols, the output of 2220 (that is, 2×(1024+86)) sampling points is generated. S...

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Abstract

The invention relates to a data frame filling method of multi-modulating modes transmission system, which selects the data processing mode through time domain / frequency domain; when no reference information is inserted into the single carrier wave time domain processing: data requiring single carrier wave time domain processing is under increased sampling; data requiring multi carrier wave frequency domain processing is under processing of interpolation of pilot signal / strongly protected unknown information, afterwards the output data is under processing of interpolation of virtual sub-carrier wave, and finally output under processing of interpolation of virtual sub-carrier wave is under IFFT processing; when reference information is inserted into the single carrier wave time domain processing, and the inserted reference information number L is equal to the inserted pilot signal / strongly protected unknown information number N: data requiring single carrier wave time domain processing is under processing of interpolation of reference information, inserted with reference information formed by L = N signs, and then output data under processing of interpolation of reference information is under increased sampling; data requiring multi carrier wave frequency domain processing is under processing of interpolation of pilot signal / strongly protected unknown information, afterwards the output data is under processing of interpolation of virtual sub-carrier wave, and finally output under processing of interpolation of virtual sub-carrier wave is under IFFT processing.

Description

technical field [0001] The invention belongs to the field of digital information transmission, in particular to a data frame filling method at a transmitting end in a multi-modulation mode digital TV terrestrial broadcasting transmission system. Background technique [0002] There are many transmission methods for modern digital TV broadcasting. According to different transmission media, the three main transmission methods are terrestrial wireless broadcasting, cable broadcasting and satellite broadcasting. According to different definition requirements, digital TV can be divided into high-definition TV and standard-definition TV. According to different application occasions, it can be divided into fixed receiving video service, mobile portable receiving video service, high-speed mobile receiving video and data service, etc. Currently, digital TV transmission standards are still being perfected. [0003] There are three established and approved digital TV terrestrial broad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/015H04L27/02
Inventor 张文军梁伟强何大治孙军管云峰归琳居峰
Owner SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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