CN1200564C - Data interweaving method in digital TV and broadcasting transmission - Google Patents
Data interweaving method in digital TV and broadcasting transmission Download PDFInfo
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- CN1200564C CN1200564C CN 01130841 CN01130841A CN1200564C CN 1200564 C CN1200564 C CN 1200564C CN 01130841 CN01130841 CN 01130841 CN 01130841 A CN01130841 A CN 01130841A CN 1200564 C CN1200564 C CN 1200564C
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Abstract
The present invention discloses a data interweaving method in digital television broadcast transmission. In the method, randomized data enters an interweaving device after RS coding of T=10(207, 187), and the interweaving device interweaves data in a convolution interweaving mode. Segment synchronization takes part in the interweaving as a whole body, and frame / field synchronization and segment synchronization in the frame / field synchronization do not take part in the interweaving. The depth of interweaving serves as one frame, and data interweaving is carried out fully in the frame without overpassing the boundary of the frame. Different interweaving parameters M, B are selected in view of different transmission modes, so that the present invention has ideal interweaving effects and ensures the flexibility of a system for transmitting multiple services.
Description
Technical field the invention belongs to digital signal transmission field, particularly in the digital television broadcasting transmission transmission data is carried out the method for interleaving treatment.
The typical digital television and broadcasting transinission system (see figure 1) of background technology comprises transmitter and receiver.Digital modulation technique adds necessary supplementary more often with encoding digital signals, as: synchronizing signal, pilot signal etc.Digital signal behind the coding forms baseband signal through behind the channel filtering.This baseband signal sends after being modulated onto frequency band corresponding through upconverter.At receiving terminal, tuner transforms to base band after analog to digital converter obtains digital signal with high-frequency signal.This digital signal is resumed the information consistent with transmitting terminal after treatment.
New digital television and broadcasting transinission system adopts offset orthogonal amplitude modulation(PAM) mode (Offset QAM is called for short OQAM).OQAM modulation and the I passage of other modulation system [as quadrature amplitude modulation (QAM), vestigial sideband modulation (VSB) mode] commonly used and data set prejudice Fig. 2 of Q passage.In the OQAM modulated process, send into I passage and Q passage in turn after the input data are encoded; In the VSB modulated process, only send into the I passage after the input data are encoded; In the QAM modulated process, send into I passage and Q passage simultaneously with the sampling rate that reduces half than OQAM and VSB mode respectively after the input data are encoded.Compare with QAM with VSB, because the OQAM signal possesses the symmetrical characteristics of time domain and carrier phase simultaneously, therefore at the carrier wave of receiving terminal with two processes of clock recovery can independently be finished and do not intersect mutually, help receiver and realize more stable reception and reduce the receiver cost.
The application of digital television and broadcasting transinission system comprises Digital Television Terrestrial Broadcasting, Digital Television wired broadcasting, Digital Television microwave broadcasting (MMDS) and Digital Television satellite broadcasting etc.Content of the present invention relates generally to Digital Television Terrestrial Broadcasting, wired broadcasting and MMDS broadcast system.In new digital television broadcasting system, terrestrial broadcasting has three kinds of transmission modes, be respectively: be used for fixing professional " 64-OQAM of 2/3 ISN ", be used for " 16-OQAM of 1/2 ISN " of mobile service and be used for " 4-OQAM of 1/2 ISN " of data service.Cable TV and MMDS broadcasting have four kinds of transmission modes, are respectively high data pattern 256-OQAM, high data pattern 64-OQAM, general data pattern 16-OQAM and general data pattern 4-OQAM.According to service needed and actual application environment, often require system to contain mixed transmission modes.Under the different transmission modes, transmission signals can have different frames/field form, and promptly a frame signal is made of the field signal of different numbers, and a field signal comprises different data segments.
Digital tv ground broadcasting will carry out the processing of a series of chnnel codings to the input data when transmission, comprise data randomization, the outer coding of Reed-Solomon (RS), data interlacing, employing grid coding TCM (the corresponding 64-OQAM of 2/3 code check, the corresponding 16-OQAM of 1/2 code check) or the interior coding of convolutional encoding (1/2 code check) or block encoding (1/2 code check) mode, add synchronizing signal, pilot signal, the channel shaping filter, up-conversion etc.The modular circuit and the flow process of its processing are seen Fig. 3.Compare with digital tv ground broadcasting, Digital Television wired broadcasting and MMDS broadcast system are except that coding module circuit in not comprising, and all the other are basic identical.That is to say between ground, wired, the MMDS broadcast system very strong compatibility is arranged.
For the impact noise (Impulse Noise) that tackles in the channel disturbs, and cooperate chnnel coding, digital television and broadcasting transinission system to want the capable factually interleaving treatment of logarithm.Useful to ISN though interweave, interweaving does not participate in the cataloged procedure of ISN.Usually, data interlacing adopts the convolutional interleave algorithm.Convolutional interleave is upset continuous byte collection by the byte of varying number in the separate data structure effectively, and burst error is spread out, so that recover correct data with error correction decoding, corresponding reverse process is carried out in deinterleaving.Data interlacing relates to three important parameters, i.e. Yu Qi maximum impact noise length L
N, the RS decoder can error correction error code word joint number L and the big or small L of RS piece
RSIn view of the above, designed interleave depth L
MAt least should reach L
M=L
N* L
RS/ L.If interleave depth is too little, avoid the effect of impact noise just poor.But, interleave depth can not design too much, otherwise coding side interweave and the deinterleaving process of decoding end can produce big system transmissions and postpones, this point can cause the restriction in the application for the broadcast system that possesses the two-way alternate communication requirement (especially wired broadcast system).
Summary of the invention the objective of the invention is for the digital television and broadcasting transinission system that contains mixed transmission modes designs corresponding data interlacing mode, so that avoid the impact noise in the channel to disturb effectively, simplifies the structure that realizes circuit simultaneously.
The data interlacing method of the present invention's design is such: in digital television and broadcasting transinission system, for various transmission modes, all adopt the mode of convolutional interleave to carry out the data interlacing processing.Enter outer code coder after the input data are randomized, outer sign indicating number adopts the RS coding of T=10 (207,187).The RS data size is 187 bytes, carries the check digit of 20 bytes, and each RS data block is 207 bytes.Determine the error code word joint number L that the RS decoder can error correction and the big or small L of RS piece thus
RSBecause the terrestrial broadcasting channel is compared with wired and MMDS broadcast channel, contain much better than impact noise and disturb, so need the bigger interleave depth of corresponding design.On the other hand, the number of fields order that frame comprised of each transmission mode of terrestrial broadcasting many than each transmission mode of wired and MMDS broadcasting.Therefore, the present invention is that terrestrial broadcasting, the designed interleave depth of each transmission mode wired and MMDS broadcasting are all frame data.If M is the byte number of each road unit delay amount of interleaver, B is the number on the road that comprised of interleaver change over switch one-period, by the combination of different B and M is set, can realize that three kinds of transport services of terrestrial broadcasting have the identical time span that interweaves.In order to simplify the structure that realizes circuit, four kinds of transmission modes of wired broadcasting and MMDS broadcasting adopt identical interleave parameter.Select suitable parameter, this design can be satisfied relative impact noise preferably environmental requirement in wired and the MMDS broadcast channel.
In transmission signals is formed, interleaver after to coding through randomization and RS outside data and outside the RS check digit effect of encoding and being produced.Section is done as a whole participation synchronously and is interweaved, and the section in frame/field synchronization and the frame/field does not participate in interweaving synchronously.
Under mixed transmission modes, each pattern is used randomizer, RS encoder separately, interleaver separately and interior code coder separately separately, and it doesn't matter each other.The randomizer of each pattern, interleaver etc. reset by synchronous reset signal separately.The input and output of convolutional deinterleaver reset by the information bit in frame/field sync signal.When normal operation, each frame of interleaver repeats once, need not to reset once more.
The present invention take all factors into consideration frame/field structure under the channel characteristics of terrestrial broadcasting, wired and MMDS broadcasting and each transmission mode difference, the data interlacing degree of depth is made as consistent with the length of data service frame.Like this, data interlacing fully carries out in frame and the boundary of not crossing over frame, has guaranteed that multiple different business can be the unit flexible combination with the frame.The present invention is provided with corresponding interleave parameter according to the practical application needs for each transmission mode, has both reached the desirable effect that interweaves, and has guaranteed the flexibility of system transmissions multiple business again.
Further describe the present invention below in conjunction with drawings and Examples.
Description of drawings Fig. 1 is typical digital television and broadcasting transinission system block diagram.
Fig. 2 is the I of VSB, QAM and OQAM, and the Q channel signal is formed.
Fig. 3 is each function module circuit and the flow process of transmitter in the DTB Digital Terrestrial Broadcasting system.
Fig. 4 is each function module circuit and the flow process of transmitter in digital cable, the MMDS broadcast system.
Fig. 5 is the frame/field form schematic diagram of digital television broadcasting system.
Fig. 6 is digital cable, MMDS broadcast system 256-OQAM field form schematic diagram.
Fig. 7 is digital cable, MMDS broadcast system 64-OQAM field form schematic diagram.
Fig. 8 is digital cable, MDS broadcast system 16-OQAM field form schematic diagram.
Fig. 9 is digital cable, MMDS broadcast system 4-OQAM field form schematic diagram.
Figure 10 is the principle and the parameter of convolutional deinterleaver in the terrestrial broadcasting 64-OQAM transmission mode.
Figure 11 is the principle and the parameter of convolutional deinterleaver in the terrestrial broadcasting 16-OQAM transmission mode.
Figure 12 is the principle and the parameter of convolutional deinterleaver in the terrestrial broadcasting 4-OQAM transmission mode.
Figure 13 is the principle and the parameter of convolutional deinterleaver in digital cable, MMDS broadcast system 4-OQAM, 16-OQAM, 64-OQAM and the 256-OQAM transmission mode.
Embodiment in the present embodiment, three kinds of transmission modes of terrestrial broadcasting and four kinds of transmission modes wired and MMDS broadcasting have section inequality, field structure.Digital tv ground broadcasting at the frame/field form of the 4-OQAM transmission mode of 16-OQAM that adopts the 64-OQAM of 2/3 ISN, 1/2 ISN or 1/2 ISN shown in Fig. 9 a, each frame is formed by 16, each is formed by 79 sections, wherein first section is frame/field sync signal, and back 78 sections is data-signal; Digital Television wired broadcasting and MMDS broadcast system at the field form that adopts 256-OQAM, 64-OQAM, 16-OQAM and 4-OQAM transmission mode respectively as Fig. 6, Fig. 7, Fig. 8 and shown in Figure 9, each frame is formed by one, four kinds of transmission modes of each correspondence, form by 79/105/157/313 section respectively, wherein first section is field sync signal, and back correspondence respectively is a data-signal for 78/104/156/312 section.For various transmission modes, every section length is all identical, contains 836 symbols, wherein preceding 8 symbols are segment sync signals, every section appearance once, back 828 symbols are that the section synchronization position after interweaving is constant through the data-signal or the frame/field sync signal that interweave.
Enter outer code coder after the input data are randomized, outer sign indicating number adopts the RS coding of T=10 (207,187).The RS data size is 187 bytes, carries the check digit of 20 bytes, and each RS data block is 207 bytes.Be interleaver after outer encoder, the present invention adopts the convolutional interleave mode, is that unit interweaves to the input data with the byte.The pairing frame of transmission mode/the field form is relevant for the transmission mode of the data interlacing degree of depth and mode and system and every kind.At above-mentioned different transmission mode, the principle of each convolutional deinterleaver and parameter are seen Figure 10, Figure 11, Figure 12 and Figure 13 respectively.The figure medium square is represented eight parallel-by-bit shift registers, and each byte cycle of change over switch changes the position one time.M is the byte number of each road unit delay amount of interleaver, and B is the number on the road that comprised of interleaver change over switch one-period.
Data and the outer coding RS check digit effect that produced thereof of interleaver after to coding outside randomization and RS, section is done as a whole participation synchronously and is interweaved, and section does not participate in synchronously interweaving in frame/field synchronization and the frame/field.
The parameter of each convolutional deinterleaver is selected as follows:
1) 64-OQAM of 2/3 ISN in the DTB Digital Terrestrial Broadcasting system
The convolutional deinterleaver degree of depth is chosen as 16, and every contains 78 data segments, and promptly the convolutional deinterleaver degree of depth is 1248 sections.In Figure 10, M=6, B=208, section is done as a whole participation synchronously and is interweaved, and leads directly to from the 1 tunnel of MUX.Data after interweaving are formation 1 frame after 2/3 ISN coding and the mapping of 8 level, and totally 16,1248 data segments.
2) 16-OQAM of 1/2 ISN in the DTB Digital Terrestrial Broadcasting system
The convolutional deinterleaver degree of depth is chosen as 16, and every contains 78 data segments, and promptly the convolutional deinterleaver degree of depth is 1248 sections.In Figure 11, M=3, B=208, section is done as a whole participation synchronously and is interweaved, and leads directly to from the 1 tunnel of MUX.Data after interweaving are formation 1 frame after 1/2 ISN coding and the mapping of 4 level, and totally 16,1248 data segments.
3) 4-OQAM of 1/2 ISN in the DTB Digital Terrestrial Broadcasting system
The convolutional deinterleaver degree of depth is chosen as 16, and every contains 78 data segments, and promptly the convolutional deinterleaver degree of depth is 1248 sections.In Figure 12, M=6, B=104, section is done as a whole participation synchronously and is interweaved, and leads directly to from the 1 tunnel of MUX.Data after interweaving are formation 1 frame after 1/2 ISN coding and the mapping of 2 level, and totally 16,1248 data segments.
4) 4-OQAM, 16-OQAM, 64-OQAM and the 256-OQAM in digital cable, the MMDS broadcast system
The convolutional deinterleaver degree of depth is chosen as 1, and every corresponding 4-OQAM, 16-OQAM, 64-OQAM, 256-OQAM contain 312,156,104 and 78 data segments respectively, and promptly the convolutional deinterleaver degree of depth is respectively 3 12,156,104 and 78 sections.In Figure 13, M=3, B=104, section is done as a whole participation synchronously and is interweaved, and leads directly to from the 1 tunnel of MUX.Data after interweaving form 1 frame respectively after 2 level, 4 level, 8 level, the mapping of 16 level, totally 1, be respectively 312,156,104 and 78 data segments.
Under mixed transmission modes, each pattern is used randomizer, RS encoder separately, interleaver separately and interior code coder separately separately, and it doesn't matter each other.The randomizer of each pattern, interleaver etc. reset by synchronous reset signal separately.The input and output of convolutional deinterleaver reset by the information bit in frame/field sync signal.When normal operation, each frame of interleaver repeats once, need not to reset once more.
Claims (1)
1. the data interlacing method during a digital television broadcasting is transmitted, data after the randomization are through T=10 (207,187) enter interleaver behind the RS coding, interleaver adopts the mode of convolutional interleave to carry out data interlacing, each road unit delay amount of interleaver is the M byte, and interleaver change over switch one-period comprises the B road, and section is done as a whole participation synchronously and interweaved, section in frame/field synchronization and the frame/field does not participate in interweaving synchronously, it is characterized in that:
Described data interlacing method is applicable to that four kinds of transmission modes of three kinds of transmission modes of terrestrial broadcasting and wired and microwave broadcasting have the digital television broadcasting system of different sections, field structure, and segment sync signal is the 1 the tunnel straight-through from MUX's; In the 64-OQAM transmission mode of 2/3 ISN in terrestrial broadcast system, corresponding 16 an of frame, every contains 78 data segments, and M equals 6, and B equals 208; In the 16-OQAM transmission mode of 1/2 ISN in terrestrial broadcast system, corresponding 16 an of frame, every contains 78 data segments, and M equals 3, and B equals 208; In the 4-OQAM transmission mode of 1/2 ISN in terrestrial broadcast system, corresponding 16 an of frame, every contains 78 data segments, and M equals 6, and B equals 104; In 4-OQAM, 16-OQAM in wired and microwave broadcasting system, 64-OQAM and the 256-OQAM transmission mode, one frame is one, every corresponding 4-OQAM, 16-OQAM, 64-OQAM and 256-OQAM contain 312,156,104 and 78 data segments respectively, and M is equal to 3, and B is equal to 104.
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| CN1305264C (en) * | 2003-04-14 | 2007-03-14 | 中兴通讯股份有限公司 | Device and method for radio local network baseband processing and coding modulation |
| CN100356784C (en) * | 2003-04-18 | 2007-12-19 | 上海交通大学 | Data interlacing method in digital telerision broundcasting transmission |
| CN100425076C (en) * | 2004-03-29 | 2008-10-08 | 上海交通大学 | Data interleaving method in digital TV broadcast transmission |
| CN1333600C (en) * | 2004-03-29 | 2007-08-22 | 上海交通大学 | Channel coding method for digital TV ground broadcasting mixing transmission system |
| KR100744055B1 (en) * | 2004-06-23 | 2007-07-30 | 삼성전자주식회사 | Digital broadcasting transmission/reception system capable of improving receiving and equalizing performance and signal processing method thereof |
| US7711045B2 (en) * | 2005-07-13 | 2010-05-04 | Samsung Electronics Co., Ltd. | Digital broadcast transmitter/receiver having improved receiving performance and signal processing method thereof |
| CN101383809B (en) * | 2008-10-27 | 2010-09-15 | 宁波大学 | Digital television ground broadcast transmitter space-frequency modulation method based on embedded training sequence and BICM |
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