CN1237797C - Signal transmission method in digital television and broadcasting transinission system - Google Patents
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Abstract
The present invention discloses a signal transmitting method in a digital TV broadcasting transmission system, which is suitable for a digital TV ground broadcasting transmission system, a digital TV wire broadcasting transmission system and a digital TV microwave broadcasting transmission system. The present invention arranges a data structure according to a certain frame field format. A field/frame synchronizing signal composed of 828 symbols comprises two groups of identical 32-bit system information bits, a 511-bit pseudorandom code and a 253-bit pseudorandom code, wherein the two groups of identical 32-bit system information bits are respectively positioned at the head and the tail parts. The transmission system can support hybrid transmission in various transmission modes in the method, the mixing ratio of various business volumes is marked by using the frame as the unit, and thereby, the flexibility of the system which selects different businesses is enhanced.
Description
The invention belongs to field of signal transmissions, particularly the method for transmitting signals in Digital Television Terrestrial Broadcasting, Digital Television wired broadcasting and the transmission of Digital Television microwave broadcasting.
The application of digital television and broadcasting transinission system comprises Digital Television Terrestrial Broadcasting, Digital Television wired broadcasting, Digital Television microwave broadcasting and Digital Television satellite broadcasting etc.Typical digital television and broadcasting transinission system 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 (OQAM).OQAM modulation and the I passage of other modulation system [as quadrature amplitude modulation (QAM), vestigial sideband modulation (VSB)] commonly used and data set prejudice Fig. 1 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.
Digital tv ground broadcasting will carry out the processing of a series of chnnel codings to the input data when transmission, the interior coding that comprises data randomization, the outer coding of Reed-Solomon (RS), data interlacing, employing grid coding (TCM) or block encoding mode, add synchronizing signal, pilot signal, the channel shaping filter, up-conversion etc.Compare with digital tv ground broadcasting, Digital Television wired broadcasting and microwave broadcasting system are except that coding module in not comprising, and all the other are basic identical.That is to say that there are very strong compatibility in ground, wired, microwave broadcasting system.
Synchronizing signal comprises segment sync signal and field sync signal, and they are significant for system synchronization that guarantees whole digital broadcasting transmission system and clock recovery etc.According to the requirement of transport service, a Frame can be formed in the plurality of data field, and the beginning of every frame is represented by frame synchronizing signal.Frame synchronizing signal, field sync signal, segment sync signal and input data are connection object, and they have constituted the frame/field form of transmission signals jointly.
In new digital television broadcasting system, according to service needed and actual application environment, terrestrial broadcasting has three kinds of transmission modes, is respectively: be used for fixing professional lattice code 64-OQAM, be used for the block encoding 16-OQAM of mobile service and be used for the block encoding 4-OQAM of data service.Cable TV and microwave broadcasting also have three kinds of transmission modes, are respectively: high data pattern 256-OQAM, high data pattern 64-OQAM and general data pattern 16-OQAM.At this moment often require system to contain mixed transmission modes.System information is every all possible difference, for example: this is that fixed service receives, and uses lattice code 64-OQAM transmission mode, and next then may be the data service reception, use block encoding 4-OQAM transmission mode.Therefore, be necessary in the data of transmission, to point out transmission mode and other a series of information reliably, as system parameters, randomizer and the indication information etc. that resets that interweaves.In addition, according to the requirement of different business amount, the length of corresponding business frame should be set.Therefore should comprise the system information position in the frame/field form of transmission signals and come information such as indicating transmission mode.
The purpose of this invention is to provide a kind of data placement of frame/field format structure that utilizes and realize that the signal in the digital television broadcasting transmits, utilize this kind method for transmitting signals can satisfy the multiple transmission mode requirement of Digital Terrestrial Television Broadcast transmission, wired broadcasting and microwave broadcasting transmission.
Frame/field the form of the transmission signals of the present invention design is such: transmit signal data is that unit is divided into some fields with " field ", during transmission in chronological sequence one connect place transmission.Ground broadcast transfer system is supported the mixed transport of multiple transmission mode, different transmission modes is that unit mixes with the field, frame synchronizing signal is to realize by the definition that changes the system information in the field sync signal, frame synchronizing signal can be considered as the special shape of field sync signal, in the beginning of each frame, frame synchronizing signal directly replaces field sync signal.Adjacent field may be same pattern, also may be different mode.The system information position definition of each field mode by being comprised in the field synchronization segments.The size of frame and field is determined.Each frame is formed by 16, and each field signal is made up of 79 data " section ", comprises one section field sync signal (or frame synchronizing signal) and 78 segment data signals.Every section contains 836 symbols, and wherein preceding 8 symbols are segment sync signals, every section appearance once, back 828 symbols are data-signal (comprise coding after data and RS check digit) or field/frame synchronizing signal.Field/frame synchronizing signal contains pseudo noise code and two groups (each 32 bit) identical system information positions through the spread spectrum protection of one 511 bit and one 253 bit (255 bits-2 bit) and forms.Transmission mode in Digital Television wired broadcasting and the microwave broadcasting system no longer changes after determining, promptly according to the setting of system information position, and fixing a kind of transmission (modulation) pattern that adopts.This moment, one frame was exactly one.Every length is different according to different modulating modes, every of 256-OQAM modulating mode comprises 1 field synchronization segments and 78 data segments, every of 64-OQAM modulating mode comprises 1 field synchronization segments and 104 data segments, and every of 16-OQAM modulating mode comprises 1 field synchronization segments and 156 data segments.The length of segment sync signal and field/frame synchronizing signal is identical with the corresponding contents of terrestrial broadcast system with arrangement.
Transmission signals adopts the transmission method of the present invention's design, and transmission system can be the mixed proportion that unit marks the miscellaneous service amount with the frame by the system information position being set and being the mixed transport of the multiple transmission mode of mode back-up system of unit independent transmission with the field.Increase the flexibility ratio of system's selection different business, expanded the range of application of system.
Further describe embodiments of the invention below in conjunction with accompanying drawing.
Fig. 1 is the I of VSB, QAM and OQAM, and the Q channel signal is formed.
Fig. 2 is the frame/field form schematic diagram of DTB Digital Terrestrial Broadcasting system.
Fig. 3 is digital cable, microwave broadcasting system 256-OQAM field form schematic diagram.
Fig. 4 is digital cable, microwave broadcasting system 64-OQAM field form schematic diagram.
Fig. 5 is digital cable, microwave broadcasting system 16-OQAM field form schematic diagram.
Fig. 6 is the segment sync signal form.
Fig. 7 is the composition of field sync signal.
Fig. 8 is the producing method of PN511.
Fig. 9 is the producing method of PN255.
After the input data are randomized, enter outer code coder, in new digital television and broadcasting transinission system, outer sign indicating number adopts the RS coding of T=10 (207,187).Be that data size is 187 bytes, carry the check digit of 20 bytes.Each RS data block is 207 bytes.
Transmission signals is that one of unit connects place transmission with " field ".The frame of digital tv ground broadcasting/field form as shown in Figure 2, each frame is formed by 16, each is formed by 79 sections, wherein first section is field/frame synchronizing signal, back 78 sections is data-signal; Digital Television wired broadcasting and microwave broadcasting system at the field form that adopts 256-OQAM, 64-OQAM and 16-OQAM modulation system respectively as Fig. 3, Fig. 4 and shown in Figure 5, each correspondence is formed by 79/105/157 section, wherein first section is field sync signal, and back correspondence respectively is a data-signal for 78/104/156 section.Every section length is all identical, contains 836 symbols, and wherein preceding 8 symbols are segment sync signals, every section appearance once, back 828 symbols are data-signal (comprise coding after data and RS check digit) or field/frame synchronizing signal.
No matter be terrestrial broadcast system or wired broadcasting and microwave broadcasting system, section wherein, the definition of field/frame synchronizing signal and arrange identically, section, field/frame synchronizing signal are all used two level expression, and do not participate in chnnel coding.The different needs of the data based transport service of being transmitted, can adopt different modulating modes such as block encoding 4-OQAM, block encoding 16-OQAM, lattice code 64-OQAM, 16-OQAM, 64-OQAM or 256-OQAM, each symbol is corresponding 2 level, 4 level, 8 level and 16 level respectively.Like this, the RS data block of 207 bytes of each input can have corresponding arrangement according to the different modulating mode in each section, for example: if with lattice code 64-OQAM or the fixing business that receives of 16-OQAM transmission, then a RS data block is arranged in the section, the former transmits with 8 level OQAM, and the latter is transmitted with 4 level OQAM.If move the business of reception with block encoding 16-OQAM transmission, then a RS data block is arranged in the two neighboring sections and transmits with 4 level OQAM.If with block encoding 4-OQAM transmission Data Receiving business, then a RS data block is arranged in adjacent 4 sections and transmits with 2 level OQAM.Under the high data pattern of 256-OQAM, per two RS data blocks are arranged at transmission in a section; Under the high data pattern of 64-OQAM, per three RS data blocks are arranged in the two neighboring sections to be transmitted.
The segment sync signal form is seen Fig. 6.Segment sync signal is 82 level symbols: 0,1,0,1,1,0,0,0.
The composition of field sync signal is seen Fig. 7.In 836 symbols forming field sync signal, the segment sync signal that 8 symbols are arranged, the system of 32 symbols (pattern) information bit, the random sequence of the PN511 of 511 symbols, the random sequence of the PN255 of 253 symbols (removing last two), and with the system information position of identical second group of 32 symbol in system information position of 32 symbols in front.
For various OQAM modulating modes, in Fig. 2 and Fig. 6, the unit symbol sample frequency is V=14.28MHz, and real part (I passage) appears on the odd point, and imaginary part (Q passage) appears on the even number point.
Table 1 is the definition of 32 information bits.When 32 bits of the arbitrary sequence in the table 1 are got contrary sign, its complementary sequence can be obtained, thus, 32 information sequences 64 can be expanded to.Complementary series is used to refer to frame synchronization and resets, and when frame synchronization and repositioning information occurred, the randomizer of system, functional reduction such as interweaved.The system information content of 64 system information positions and representative thereof sees Table 2.Obviously, the definition of table 1 and table 2 can corresponding change or additional.
32 information bit definition of table 1
A 1?1?1?0?0?1?1?0?1?1?1?1?1?0?1?0?0?0?1?0?0?1?0?1?0?1?1?0?0?0?0?0
I 1?1?1?0?0?1?1?0?0?0?0?0?0?1?0?1?0?0?1?0?0?1?0?1?1?0?0?1?1?1?1?1
Z 1?0?1?1?0?0?1?1?0?1?0?1?0?0?0?0?1?0?0?0?1?1?1?1?0?0?1?1?0?1?0?1
AA?1?1?0?1?0?1?0?1?0?0?1?1?0?1?1?0?1?1?1?0?1?0?0?1?0?1?0?1?0?0?1?1
BA?1?0?0?0?0?0?0?0?0?1?1?0?0?0?1?1?1?0?1?1?1?1?0?0?0?0?0?0?0?1?1?0
CA?1?1?1?0?1?0?0?1?0?0?0?0?1?0?1?0?1?1?0?1?0?1?0?1?0?1?1?0?1?1?1?1
DA?1?0?1?1?1?1?0?0?0?1?0?1?1?1?1?1?1?0?0?0?0?0?0?0?0?0?1?1?1?0?1?0
EA?1?1?0?1?1?0?1?0?0?0?1?1?1?0?0?1?1?1?1?0?0?1?1?0?0?1?0?1?1?1?0?0
FA?1?0?0?0?1?1?1?1?0?1?1?0?1?1?0?0?1?0?1?1?0?0?1?1?0?0?0?0?1?0?0?1
Expressed content-defined in table 2 system information position
+A 256-OQAM
-A keeps
+B 64-OQAM
-B keeps
+C 16-OQAM
-C keeps
+D 4-OQAM
-D keeps
This lattice code of+E 64-OQAM, next lattice code 64-OQAM
This lattice code of-E 64-OQAM resets, next lattice code 64-OQAM
This lattice code of+F 64-OQAM, next block encoding 16-OQAM
This lattice code of-F 64-OQAM resets, next block encoding 16-OQAM
This lattice code of+G 64-OQAM, next block encoding 4-OQAM
This lattice code of-G 64-OQAM resets, next block encoding 4-OQAM
This block encoding of+H 16-OQAM, next lattice code 64-OQAM
This block encoding of-H 16-OQAM resets, next lattice code 64-OQAM
This block encoding of+I 16-OQAM, next block encoding 16-OQAM
This block encoding of-I 16-OQAM resets, next block encoding 16-OQAM
This block encoding of+J 16-OQAM, next block encoding 4-OQAM
This block encoding of-J 16-OQAM resets, next block encoding 4-OQAM
This block encoding of+K 4-OQAM, next lattice code 64-OQAM
This block encoding of-K 4-OQAM resets, next lattice code 64-OQAM
This block encoding of+L 4-OQAM, next block encoding 16-OQAM
This block encoding of-L 4-OQAAM resets, next block encoding 16-OQAM
This block encoding of+M 4-OQAM, next block encoding 4-OQAM
This block encoding of-M 4-OQAM resets, next block encoding 4-OQAM
This lattice code of+N 64-OQAM, next lattice code 64-OQAM resets
This lattice code of-N 64-OQAM resets, and next lattice code 64-OQAM resets
This lattice code of+O 64-OQAM, next block encoding 16-OQAM resets
This lattice code of-O 64-OQAM resets, and next block encoding 16-OQAM resets
This lattice code of+P 64-OQAM, next block encoding 4-OQAM resets
This lattice code of-P 64-OQAM resets, and next block encoding 4-OQAM resets
This block encoding of+Q 16-OQAM, next lattice code 64-OQAM resets
This block encoding of-Q 16-OQAM resets, and next lattice code 64-OQAM resets
This block encoding of+R 16-OQAM, next block encoding 16-OQAM resets
This block encoding of-R 16-OQAM resets, and next block encoding 16-OQAM resets
This block encoding of+S 16-OQAM, next block encoding 4-OQAM resets
This block encoding of-S 16-OQAM resets, and next block encoding 4-OQAM resets
This block encoding of+T 4-OQAM, next lattice code 64-OQAM resets
This block encoding of-T 4-OQAM resets, and next lattice code 64-OQAM resets
This block encoding of+U 4-OQAM, next block encoding 16-OQAM resets
This block encoding of-U 4-OQAM resets, and next block encoding 16-OQAM resets
This block encoding of+V 4-OQAM, next block encoding 4-OQAM resets
This block encoding of-V 4-OQAM resets, and next block encoding 4-OQAM resets
+ W keeps
-W keeps
+ X keeps
-X keeps
+ Y keeps
-Y keeps
+ Z keeps
-Z keeps
+ AA keeps
-AA keeps
+ BA keeps
-BA keeps
+ CA keeps
-CA keeps
+ DA keeps
-DA keeps
+ EA keeps
-EA keeps
+ FA keeps
-FA keeps
System wouldn't comprise this pattern of 4-OQAM at present, can be considered retained-mode.When receiver receives retained-mode, this field signal is not dealt with, skip this.
The producing method of PN511 is seen Fig. 8 in the field sync signal.The generation formula of PN511 is X
9+ X
7+ X
6+ X
4+ X
3+ X+1, preset value are 010000000.Its complete sequence sees Table 3.
0000?0001?0111?1111?1100?1010?1010?1110?0110?0110?1000?1000?1001?1110?0001?1101
0111?1101?0011?0101?0011?1011?0011?1010?0100?0101?1000?1111?0010?0001?0100?0111
1100?1111?0101?0001?0100?1100?0011?0001?0000?0100?0011?1111?0000?0101?0100?0000
1100?1111?1110?1110?1010?1001?0110?0110?0011?0111?0111?1011?0100?1010?0100?1110
0111?0001?0111?0100?0011?0100?1111?1011?0001?0101?1011?1100?1101?1010?1110?1101
1001?0110?1101?1100?1001?0010?1110?0011?1001?0111?1010?0011?0101?1000?0100?1101
1111?0001?0010?1011?1100?0110?0101?0000?1000?1100?0001?1110?1111?1101?0110?1010
1100?1001?1001?0001?1101?1100?0010?1101?0000?0110?1100?0000?1001?0000?0001?110
The numerical value of table 3 PN511
The producing method of PN255 is seen Fig. 9.The generation formula of PN255 is X
8+ X
5+ X
3+ X+1, its output is anti-phase.Preset value is 00000001.The last 2 bits deletion of sequence need not.Its complete sequence sees Table 4.
0111?1111?0110?1000?0000?0111?0010?1010?1000?0100?1100?1101?0110?1110?1110?0111
0000?1111?0111?1010?1111?1000?0011?0000?0010?1011?1010?1011?0011?1100?1100?0100
0001?0001?0110?1010?0101?1000?1100?1001?1101?0001?0010?0001?1010?0100?1010?0011
0110?1100?1011?1000?1110?1100?0010?1111?0001?0100?1111?1010?0110?1111?1100?100
The numerical value of table 4 PN255
Claims (3)
1. the method for transmitting signals in the digital television and broadcasting transinission system, transmit signal data is that unit sends with the field, many field signals are formed a frame, each field signal comprises one section field/frame synchronizing signal and multiple segment data signal, it is characterized in that: every segment signal contains 836 symbols, wherein preceding 8 symbols are segment sync signal, and back 828 symbols are data-signal or field/frame synchronizing signal;
828 symbols of described field/frame synchronizing signal are made up of the pseudo noise code of system information position, 511 bits and one 253 bit of two groups of 32 identical bits that lay respectively at head and the tail.
2. method for transmitting signals according to claim 1 is characterized in that: described 253 bit pseudo-random sign indicating numbers remove last 2 bits by one 255 bit pseudo-random sign indicating number and constitute, and the multinomial that produces 255 bit pseudo-random sign indicating numbers is: X
8+ X
5+ X
3+ X+1, its output is anti-phase, and preset value is 00000001.
3. method for transmitting signals according to claim 1 and 2 is characterized in that: segment sync signal is 82 level symbols: 0,1,0,1,1,0,0,0.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100356786C (en) * | 2003-11-13 | 2007-12-19 | 上海交通大学 | Signal transmission method in digital TV ground broadcast transmission system |
| CN100356792C (en) * | 2004-03-29 | 2007-12-19 | 上海交通大学 | Mixed transmission method in digital television ground troadcasting transmission system |
| CN100446574C (en) * | 2005-09-08 | 2008-12-24 | 电子科技大学 | Frame transmission method for moving and hand-held wireless videocast |
| CN101909193B (en) * | 2009-06-05 | 2012-02-08 | 清华大学 | Embedded multi-service transmitting method based on DTMB standard and device thereof |
| CN106533630B (en) * | 2016-12-09 | 2019-08-27 | 天津大学 | A kind of highly reliable emergency short message transmission method based on digital broadcasting signaling aggregation |
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