Multi-modulation transmission system and data frame filling method thereof
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A technology of transmission system and filling method, which is applied in the field of multi-modulation mode transmission system and its data frame filling, can solve the problems of high system implementation complexity, sensitivity to system frequency deviation, and non-support for mobile reception, etc., to reduce hardware complexity, Effective zero-frequency interference and simplified physical implementation
Active Publication Date: 2011-09-21
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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[0008] 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
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Embodiment 2
[0064] 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.
[0065] 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
[0067] 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.
[0068] 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
[0069] 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.
[0070] 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 provides a multi-modulation transmission system and a data frame filling method thereof, which relate to the field of digital information transmission, wherein the data frame filling metThe invention provides a multi-modulation transmission system and a data frame filling method thereof, which relate to the field of digital information transmission, wherein the data frame filling method of the multi-modulation transmission system performs data frame filling after channel coding and mapping, and the data frame filling comprises single-carrier time-domain processing and multi-carrihod of the multi-modulation transmission system performs data frame filling after channel coding and mapping, and the data frame filling comprises single-carrier time-domain processing and multi-carrier frequency-domain processing and comprises the following steps: selecting the single-carrier time-domain processing or the multi-carrier frequency-domain processing by a time-domain or frequency-domer frequency-domain processing and comprises the following steps: selecting the single-carrier time-domain processing or the multi-carrier frequency-domain processing by a time-domain or frequency-domain selecting module; according to the selection result, performing the processing of inserting reference information on data requiring the single-carrier time-domain processing, wherein the symbolicain selecting module; according to the selection result, performing the processing of inserting reference information on data requiring the single-carrier time-domain processing, wherein the symbolicnumber of the inserted reference information is L; and according to the selection result, performing the processing of inserting pilot signal or strongly protected unknown information on the data requnumber of the inserted reference information is L; and according to the selection result, performing the processing of inserting pilot signal or strongly protected unknown information on the data requiring the multi-carrier frequency-domain processing, wherein the symbolic number N of the inserted pilot signal or the strongly protected unknown information is equal to the symbolic number L of the iiring the multi-carrier frequency-domain processing, wherein the symbolic number N of the inserted pilot signal or the strongly protected unknown information is equal to the symbolic number L of the inserted reference information, and the output data are processed by discrete Fourier inverse transform.nserted reference information, and the output data are processed by discrete Fourier inverse transform.
Description
[0001] This application is a divisional application of a patent application with an application date of July 11, 2006, an application number of 200610028801.4, and a patent application titled "Data Frame Filling Method for Multi-modulation Mode Transmission System". technical field [0002] The invention belongs to the field of digital information transmission, in particular to a multi-modulation mode transmission system and a data frame filling method thereof. Background technique [0003] 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 vide...
Claims
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Application Information
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Patent Type & Authority Patents(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 NAT ENG RES CENT OF DIGITAL TELEVISION
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