CN1798337A - Framing method of isomorphic data in two domains in use for ground digital TV transmission system - Google Patents
Framing method of isomorphic data in two domains in use for ground digital TV transmission system Download PDFInfo
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Abstract
The invention is a system framing structure for use in using the system framing module to implement process of time domain and frequency domain. The system frame is processed through the selector to select frequency domain processing mode or time domain processing mode. The system information for selecting both domains can be implemented by sending short PN code with different phases. The invention can make the ground digital TV broadcasting system to implement the integration process of time domain and frequency domain and to implement unified process for the single carrier and multi carrier.
Description
Technical field
The invention belongs to the television transmission technical field, it is particularly related to the terrestrial DTV transmission technology.
Background technology
At present, terrestrial DTV transmission standard/scheme both domestic and external is existing:
1) U.S.'s terrestrial DTV transmission standard ATSC (implementing) from nineteen ninety-five
2) European terrestrial DTV transmission standard DVB-T (implementing) from 1997
3) Japanese terrestrial DTV transmission standard ISDB-T (to be performed)
4) the terrestrial DTV transmission plan DMB-T of Tsing-Hua University
5) the terrestrial DTV transmission plan ADTB of Shanghai Communications University
6) University of Electronic Science and Technology's terrestrial DTV transmission plan SMCC ﹠amp; SMCC-plus
7) the terrestrial DTV transmission plan TiMi of institute of wide section
In existing terrestrial DTV transmission standard/scheme, the method that ground digital TV transmission system adopts usually realizes (as shown in Figure 1):
Transport stream (TS) data from multiplexer at first are converted to multi-stage data stream according to the priority of data flow through time domain burst and classification 1, then every grade of data flow point Jing Guo randomizer 2, form transmission frames through data transport module 8 after the constellation mapper 6 of outer encoder 3, interleaver 4, inner encoder 5 and QAM mode, transmission frame and then form system-frame through the data behind the encoders 11 through set of systems frame module 9 with system information 10, wherein system information comprise the superframe head, long synchronously, control information, time service sequence and double pilot information; Above-mentioned outer encoder 3, inner encoder 5 can replace with LDPC sign indicating number 7.
In these above-mentioned terrestrial DTV transmission standard/schemes, there are two kinds of transmission systems: single carrier system and multicarrier system.The single carrier system has mainly adopted the processing mode of time domain, and the multicarrier system has mainly adopted the processing mode of frequency domain.These two kinds of systems all have been applied on the market, in the face of which kind of mode of the end that is applied to of complicated ground mobile channel can more risingly still not have final conclusion at present.
Summary of the invention
The purpose of this invention is to provide a kind of framing method of isomorphic data in two domains in that is used for ground digital TV transmission system, adopt method of the present invention, can overcome in the existing terrestrial television transmission system and can only use single time domain or frequency domain technique, make and in the terrestrial television transmission system, can be implemented in time domain and frequency domain synthesis processing simultaneously, handle to realize the unified of single carrier and multicarrier, give full play to single carrier and multicarrier advantage separately, select for the digital terrestrial television system transmits to provide on the territory (time domain or frequency domain) flexibly in data, build suitable transmission system in order to the strong point of dealing with technology with time domain or frequency domain separately.
For method of the present invention is described easily, at first make a term definition:
Two territories: refer to time domain and frequency domain;
The isomorphism framing: referring to that time domain and frequency domain all adopt with a kind of structure carries out framing;
PN: refer to pseudo random sequence;
LDPC sign indicating number: index and low density odd even effect sign indicating number;
QAM mode: make a comment or criticism and hand over the amplitude modulation(PAM) mode;
OFDM: the friendship frequency division multiplexing of making a comment or criticism.
A kind of framing method of isomorphic data in two domains in that is used for ground digital TV transmission system provided by the invention, it comprises following step (as shown in Figure 1):
Step 1: time domain burst and classification 1 are converted to multi-stage data stream from the priority of the data based data flow of transport stream (TS) of multiplexer and the economize on electricity situation of ambulatory handheld receiving equipment;
Step 2: with every grade of data flow point in the multi-stage data that obtains in the step 1 stream not through after the constellation mapper 6 of randomizer 2, outer encoder 3, interleaver 4, inner encoder 5 and QAM mode through data transport module 8 composition transmission frames, wherein outer encoder 3, inner encoder 5 can replace with LDPC sign indicating number 7;
Step 3: as shown in Figure 1, in strengthening channel control information or exclusive data inserter 12, deposit and be used to strengthen the control information of channel or some special users' specific information, these information are input in the independent logical subchannel 13, and independent logical subchannel 13 processing methods are:
At first, receive the information that strengthens channel control information or 12 inputs of exclusive data inserter;
Then, after receiving these information, distribute the experimental process channel to be used to transmit these information based on the Two dimensional Distribution of time of Frame and frequency channel, the total capacity of these some channels be channel capacity 1/15 to 1/10 between; Wherein, the distribution of frequency dimension is meant in frequency domain and disperses or add regularly specific information by certain sub-carrier regularity of distribution, the distribution of time dimension is meant that with 3 to 5 Frames be the cycle, makes the subcarrier regularity of distribution in each Frame postpone 3 to 5 subcarriers respectively; Generally, the modulation system of these subcarriers adopts the comparatively simple modulation system of BPSK, QPSK, and its error protection mode adopts the protected mode of the LDPC sign indicating number of reinforcement, and is also more reliable than the error protection mode of general data; The overall formed designated lane of subcarrier that above-mentioned time-frequency two-dimensional distributes is called the independent logical subchannel that receives enhancing channel control information or exclusive data; At receiving terminal, if the transmission of independent logical subchannel is to receive to strengthen the channel control information, then because of it adopts highly redundant degree error protection, thus can solve with high-reliability in advance, and serve as the reference signal of channel estimating;
At last, information is joined in the sub-carrier channels of distributing, deliver in the transmission frame that step 2 obtains;
Step 4: system information module 10 data after through encoders 11 codings are input in the set of systems frame module 9, wherein system information comprise the superframe head, long synchronously, control information, time service sequence and double pilot information; Simultaneously the transmission frame that obtains in the step 3 is input in the set of systems frame module 9, obtains system-frame; No matter the framing method of this isomorphism i.e. ground digital TV transmission system is to adopt the time domain mode to handle or the frequency domain mode is handled and all adopted above-mentioned same method, the tissue of system's framing frame interior structure is the same;
Step 5: the system-frame that obtains in the step 4 is input to time domain or frequency domain processing selecting device 14, and time domain or frequency domain processing selecting device 14 processing methods are:
At first, the control information that provides by system information module 10 in time domain or the frequency domain processing selecting device 14 extraction system frames about time domain or frequency domain processing mode;
Then, time domain or frequency domain processing selecting device 14 determine that according to the time domain of obtaining or the control information of frequency domain processing mode the processing mode of selector switch 15 is frequency domain data processing mode or time domain data processing mode;
At last, when selecting the time domain data processing mode, the system frame number that obtains from set of systems frame module 9 forms the module 17 according to directly delivering to the PN frame; When selecting the frequency domain data processing mode, after obtaining frame data and obtain frequency domain data from set of systems frame module 9, deliver to the PN frame and form in the module 17 through IFFT16; So far, system has adopted frequency domain data processing mode or time domain data processing mode just to be able to determine effectively actually;
Step 6:PN frame forms the performing step following (as shown in Figure 3) of module 17:
For the frame data that from time domain or frequency domain processing selecting device 14, receive;
At first, before each Frame, add an identical short PN, the i.e. short PN of fixed waveform; This weak point PN both can be used for sign synchronization, also can be used for removing OFDM under the frequency domain data mode interference between meeting;
Then, all insert a long PN before the individual Frame of n (n is a positive integer) continuously every, the length of long PN is consistent with the length of Frame; Also insert simultaneously a short PN before the long PN, will lower the synchronous and performance for estimating channel of receiving terminal when wherein n value is big, than hour then can lowering the channel service efficiency, so the value of n depends on the specific performance requirement of terrestrial television transmission system;
Step 7: the Frame that is formed module 17 outputs by the PN frame is input in base band pulse shaping and the spectrum shaping filtration module 18, through obtaining baseband signal behind base band pulse shaping and the spectrum shaping filtration module 18;
Step 8: by the baseband signal that obtains in the step 7 by intermediate frequency Modulation and upconverter 19 after, just can obtain modulated radiofrequency signal.
Through after the above step, just can in the terrestrial television transmission system, realize the processing of time domain and frequency domain synthesis simultaneously, handle to finish the unified of single carrier and multicarrier, give full play to single carrier and multicarrier advantage separately, reach the purpose that channel merges transmission.
Need explanation to be:
The mode of the employing independent logical subchannel in the step 3 transmits, and is the expansion of system and improves leaving space, and the independent logical subchannel 13 that wherein is used to carry special type information can be selected following several occupation mode by Virtual network operator:
(1) is used to transmit data fully;
(2) transmit the data of being protected by high strength, for example the auxiliary data or the sound of relevant channel estimating;
(3) do not send the independent logical sub-channel data, promptly close this independent logical subchannel.
The control information about time domain or frequency domain processing mode that is provided by system information module 10 in the step 5 also can utilize the short PN that sends out of phase to realize, multiply by as lacking PN+represented the time domain processing mode at 1 o'clock, and short PN multiply by and represented the frequency domain processing mode at-1 o'clock.
Core of the present invention is that above-mentioned ground digital TV transmission system is no matter be frequency domain processing mode or time domain processing mode, step 1, step 2, step 3, step 4 processing mode all is the same, the formation of system-frame and internal organizational structure thereof also are the same, i.e. (time domain and frequency domain) isomorphism framing in two territories, it is that frequency domain processing mode or time domain processing mode can be selected by time domain or frequency domain processing selecting device 14 that ground digital TV transmission system is selected, and wherein selecting processing mode is that the 1bit system information of frequency domain data mode or time domain data mode can utilize the short PN that sends out of phase (multiply by+1 or multiply by-1) to realize.System-frame is just given PN frame formation module 17 after also will be through an IFFT16 when selector switch 15 is selected Option 1.As for which area to implement Option 1 in still is Option 2, can be selected by the layout and the market of present operator.By on long terms, perhaps these two kinds of Option growth and decline to some extent, but this can not influence the process of the marketization.Stay some degrees of freedom to give market, do not have what harm.Also may in the different time sheet of same transmitter, be used alternatingly option Option 1 or Option 2 in the future.
The PN frame forms needs to insert short PN and long PN in the module 17, Fig. 2 has provided a kind of example of inserting short PN and long PN.Long PN is mainly used in sign synchronization, and the short PN of fixed waveform then not only can be used for sign synchronization but also can be used for removing crosstalking between OFDM symbol under the frequency domain data mode.According to the insertion method of short PN He the long PN of Fig. 2, the disposing way that adds data behind the PN as shown in Figure 3, length of short PN and long each yard of PN and putting position are as shown in Figure 4.
Adopt the mode of independent logical subchannel to transmit to the special type information that comprises Channel Transmission auxiliary data or extraordinary prioritized data, be the expansion and the raising leaving space of system.The independent logical subchannel that wherein is used to carry special type information can be selected following several occupation mode by Virtual network operator:
(1) is used to transmit data entirely;
(2) transmit the data of being protected by high strength, for example the auxiliary data or the sound of relevant channel estimating;
(3) send the independent logical sub-channel data, promptly close this independent logical subchannel.
When sending the independent logical sub-channel data, the independent logical sub-channel data can be placed according to the mode that suitable time domain and frequency domain channel are estimated, as: time-frequency two-dimensional grid mode.Though this mode is similar to the dispersion of general multicarrier system and fixing pilot tone on form and position, but its power and be no more than the information subcarrier, so essential distinction is arranged again with pilot tone.
The present invention emphasizes to realize to make a start terrestrial digital television system, and the aspect structure is unified, the receiving end aspect provides possibility for the different realization technology of receiver.The present invention realizes a kind of new isomorphic data in two domains in framing mode of frame structure in the digital terrestrial television data transmission system, and promptly data can be placed on time domain (being equivalent to single carrier) or frequency domain (being equivalent to multicarrier) arbitrarily; Propose simultaneously to adopt the mode of independent logical subchannel to transmit to the special type information that comprises Channel Transmission auxiliary data or extraordinary prioritized data, expansion leaving space for system, on same set of system equipment, the strong point of utilizing time domain or frequency domain to deal with technology separately is built suitable transmission system, thereby provides effective framework for the fusion unification of single carrier and multicarrier system.The present invention transmits to provide on the territory (initial data places time domain or frequency domain) flexibly for the digital terrestrial television system and selects in data, build suitable transmission system in order to the strong point of dealing with technology with time domain and frequency domain separately.
The single carrier of present terrestrial wireless communication in the world and multi-transceiver technology are all in develop rapidly.In the face of which kind of mode of the end that is applied to of complicated ground mobile channel can more risingly still not have final conclusion at present, the just broadcast data that utilizes the present invention to propose in the case can be divided into time domain or frequency domain, other parameter such as signal frame structure, chnnel coding, modulation and up-conversion are all consistent, arrange like this to make no matter make a start or receiving end, realize on the complexity keeping original single domain system substantially, can support simultaneously now time domain and frequently the system in two territories realize.Therefore the present invention has unified terrestrial television data transmission system (generally having time domain to handle and frequency domain processing dual mode) technically, also can extend to cable TV data transmission system (being generally the time domain processing mode) and satellite television data transmission system (being generally the time domain processing mode).
Description of drawings:
Fig. 1 is a general digital terrestrial television transmission system block diagram.
Wherein, 1 expression time domain burst and diversity module, 2 expression randomizers, 3 expression outer encoders, 4 expression interleavers, 5 expression inner encoders, 6 expression constellation mapper, 7 expression LDPC sign indicating numbers, 8 expression data transport modules, 9 expression set of systems frame modules, 10 expression system information modules, 11 presentation code devices, 18 expression base band pulse shaping and spectrum shaping filtration modules, 19 expression intermediate frequency Modulation and upconverter.
Fig. 2 is based on a kind of digital terrestrial television transmission system theory diagram example that the present invention realizes.
Wherein, 1 expression time domain burst and diversity module, 2 expression randomizers, 3 expression outer encoders, 4 expression interleavers, 5 expression inner encoders, 6 expression constellation mapper, 7 expression LDPC sign indicating numbers, 8 expression data transport modules, 9 expression set of systems frame modules, 10 expression system informations, 11 presentation code devices, 12 expressions strengthen channel control information or exclusive data inserter, 13 expression independent logical subchannels, 14 expression time domain or frequency domain processing selecting devices, 15 expression selector switches, 16 expression IFFT, 17 expression PN frames form module, 18 expression base band pulse shaping and spectrum shaping filtration modules, 19 expression intermediate frequency Modulation and upconverter.
Fig. 3 is the form of putting of short PN of the fixed waveform of cycle repetition and long PN.
Wherein, n gets 32, and each Frame beginning adds a short PN, and the data symbol zone of first frame of continuous 32 Frames adds and is used for frame synchronization and balanced long PN.
Fig. 4 is the disposing way schematic diagram of data.
This figure has illustrated the data disposing way under a kind of frequency domain mode and the time domain mode, no matter when data place frequency domain mode or time domain mode, the time domain of data processing-frequency domain cycle is 3710 points, when adopting the time-frequency that enlarges to handle the cycle, data time domain-frequency domain cycle is 4096 points, has exchanged for the operand that increases slightly this moment to have isolated fully between Frame because the intersymbol interference that multipath effect etc. are brought.Simultaneously, the selection of more than counting is to establish for the illustrative system operation principle, also may select other suitable counting.
Fig. 5 is a kind of frame assumption diagram behind short PN of adding and the long PN
Wherein, vertically represent the order that every Frame was arranged according to the time, laterally represent the disposing way of every Frame.
Embodiment:
The present invention mainly is the control information of enhancing channel or exclusive data inserter 12, independent logical subchannel 13, time domain or frequency domain processing selecting device 14 and the PN frame formation module 17 among Fig. 2.They all can be realized by FPGA (Field ProgrammableGate Array).When specific implementation, the n among Fig. 2 is desirable 32, and the Frame that adds behind short PN and the long PN can be with reference to structure realization shown in Figure 5, but also can carry out suitable adjustment according to the performance requirement of concrete terrestrial digital television system.
Claims (4)
1, a kind of framing method of isomorphic data in two domains in that is used for ground digital TV transmission system, it comprises following step:
Step 1: the transmit flow data from multiplexer will be converted to multi-stage data stream through time domain burst and classification (1) according to the priority of data flow and the economize on electricity situation of ambulatory handheld receiving equipment;
Step 2: every grade of data flow point in the multi-stage data that obtains in the step 1 stream is not passed through after the constellation mapper (6) of randomizer (2), outer encoder (3), interleaver (4), inner encoder (5) and QAM mode through data transport module (8) composition transmission frame, wherein outer encoder (3), the available LDPC sign indicating number of inner encoder (5) (7) replace;
It is characterized in that it also comprises:
Step 3: in strengthening channel control information or exclusive data inserter (12), deposit and be used to strengthen the control information of channel or some special users' specific information, these information are input in the independent logical subchannel (13), and independent logical subchannel (13) processing method is:
At first, receive the information that strengthens channel control information or exclusive data inserter (12) input;
Then, after receiving these information, distribute the experimental process channel to be used to transmit these information based on the Two dimensional Distribution of time of Frame and frequency channel, the total capacity of these some channels be channel capacity 1/15 and 1/10 between; Wherein, the distribution of frequency dimension is meant in frequency domain and disperses or add regularly specific information by certain sub-carrier regularity of distribution, the distribution of time dimension is meant that with 3 to 5 Frames be the cycle, makes the subcarrier regularity of distribution in each Frame postpone 3 to 5 subcarriers respectively; Generally, the modulation system of these subcarriers is used comparatively simple BPSK, QPSK modulation, its error protection mode adopts the protected mode of the LDPC sign indicating number of reinforcement, and the overall formed designated lane of subcarrier that above-mentioned time-frequency two-dimensional distributes is called the independent logical subchannel that receives enhancing channel control information or exclusive data;
At last, information is joined in the subchannel of distributing, deliver in the transmission frame that step 2 obtains;
Step 4: the data of system information module (10) after through encoder (11) coding are input in the set of systems frame module (9), wherein system information comprise the superframe head, long synchronously, control information, time service sequence and double pilot information; Simultaneously the transmission frame that obtains in the step 3 is input in the set of systems frame module (9), obtains system-frame;
No matter ground digital TV transmission system is to adopt the time domain mode to handle or the frequency domain mode is handled and all adopted above-mentioned same method, organizing of system-frame frame interior structure also is the same;
Step 5: the system-frame that obtains in the step 4 is input to time domain or frequency domain processing selecting device (14), and time domain or frequency domain processing selecting device (14) processing method are:
At first, the control information that provides by system information module (10) in time domain or frequency domain processing selecting device (14) the extraction system frame about time domain or frequency domain processing mode;
Then, time domain or frequency domain processing selecting device (14) determine that according to the time domain of obtaining or the control information of frequency domain processing mode the processing mode of selector switch (15) is frequency domain data processing mode or time domain data processing mode;
At last, when selecting the time domain data processing mode, the system frame number that obtains from set of systems frame module (9) forms the module (17) according to directly delivering to the PN frame; When selecting the frequency domain data processing mode, after obtaining frame data and obtain frequency domain data from set of systems frame module (9), deliver to the PN frame and form in the module (17) through IFFT (16);
The implementation method that step 6:PN frame forms module (17) is:
For the frame data that from time domain or frequency domain processing selecting device (14), receive;
At first, before each Frame, add a short PN;
Then, all insert a long PN before the individual Frame of n (n is a positive integer) continuously every, the length of long PN is consistent with the length of Frame; Also insert simultaneously a short PN before the long PN, will lower the synchronous and performance for estimating channel of receiving terminal when wherein n value is big, than hour then can lowering the channel service efficiency, so the value of n depends on the specific performance requirement of terrestrial television transmission system;
Step 7: the Frame that is formed module (17) output by the PN frame is input in base band pulse shaping and the spectrum shaping filtration module (18), through obtaining baseband signal behind base band pulse shaping and the spectrum shaping filtration module (18);
Step 8: by the baseband signal that obtains in the step 7 by intermediate frequency Modulation and upconverter (19) after, just can obtain modulated radiofrequency signal;
Through after the above step, just can in the terrestrial television transmission system, realize the processing of time domain and frequency domain synthesis simultaneously, handle to finish the unified of single carrier and multicarrier, give full play to single carrier and multicarrier advantage separately.
2, a kind of framing method of isomorphic data in two domains in that is used for ground digital TV transmission system according to claim 1; it is characterized in that the independent logical subchannel (13) described in the described step 3 can adopt BPSK modulation, QPSK modulation, its error protection mode adopts the protected mode of the LDPC sign indicating number of reinforcement.
3, a kind of framing method of isomorphic data in two domains in that is used for ground digital TV transmission system according to claim 1, it is characterized in that the short PN that adds before each Frame in the described step 6 all is the same, promptly adopt the short PN of fixed waveform, described short PN both can be used for sign synchronization, also can be used for removing the intersymbol interference of OFDM under the frequency domain data mode.
4, a kind of framing method of isomorphic data in two domains in that is used for ground digital TV transmission system according to claim 1 is characterized in that the system control information about time domain or frequency domain processing mode that is provided by system information module (10) in the described step 5 can utilize the short PN that sends out of phase to realize.
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| CN101383806B (en) * | 2008-10-27 | 2010-12-22 | 宁波大学 | Digital television ground broadcast transmitter space-frequency modulation method having time-domain training sequence |
| CN101383805B (en) * | 2008-10-27 | 2010-12-01 | 宁波大学 | Digital television ground broadcast transmitter modulation method having time-domain training sequence |
| CN101800723B (en) * | 2009-02-11 | 2012-12-12 | 北京泰美世纪科技有限公司 | Mobile multimedia broadcast transmission system |
| CN112104582A (en) * | 2020-11-09 | 2020-12-18 | 电子科技大学 | I/Q domain modulation method, double domain modulation method and multiple access communication method |
| CN112104582B (en) * | 2020-11-09 | 2021-02-05 | 电子科技大学 | I/Q domain modulation method, double domain modulation method and multiple access communication method |
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