CN101022436A - Compatible multistandard transmission realizing method in T-MMB system - Google Patents
Compatible multistandard transmission realizing method in T-MMB system Download PDFInfo
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- CN101022436A CN101022436A CN 200610161929 CN200610161929A CN101022436A CN 101022436 A CN101022436 A CN 101022436A CN 200610161929 CN200610161929 CN 200610161929 CN 200610161929 A CN200610161929 A CN 200610161929A CN 101022436 A CN101022436 A CN 101022436A
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Abstract
A method for realizing compatibility of multi-type standard transmission in T-MMB system includes remaining DAB and T-DMB system structure unchanged, carrying out channel coding and time interlace as well as modulation on T-MMB service data; embedding DAB, DAB-IP, T-DMB and T-MMB service data in MSC: adding indication on T-MMB service in FIC to form transmission frame to be sent out and using DAB, DAB-IP and T-DMA receiver to process DAB, DAB-IP, I-DMB and T-MMB relevant service signals.
Description
Technical field
The present invention relates to digital information transmission technical field, refer to especially a kind of in ground mobile multimedia broadcast (T-MMB) system the implementation method of compatible multistandard.
Background technology
Digital audio broadcasting DAB standard is the international standard that is used for digital audio broadcasting that the eighties of last century International Organization for Standardization nineties is formulated, and adopts convolution code as error correcting code.The DAB system compares with traditional AM/FM broadcasting system has advantages such as good, the mobile receiving ability of tonequality is strong, is continue traditional amplitude modulation, third generation broadcasting after the FM broadcasting.
Used convolution code to add the RS sign indicating number in the T-DMB that on the DAB basis, grows up (T-DMB) system as error correcting code, utilized the technical advantage of DAB fully, on function, will transmit single audio-frequency information and expand to variety carrier such as data, literal, figure and video.Provide that capacity is big, the data message of good reliability transmits.
Though DAB and T-DMB system have above-mentioned advantage, but also exist weak point: the two all adopts the DQPSK modulation, the availability of frequency spectrum is low, does not provide enough information throughput to satisfy the such high-quality service of mobile TV, does not provide enough power-saving measures or the like for receiver.
Ground mobile multimedia broadcast T-MMB (Terrestrial Mobile Multimedia Broadcasting) then is on the basis of DAB and T-DMB standard, by adding a kind of new DMB standard that contents such as new block encoding (as LDPC coding), time-interleaved, high order modulation and professional indication information realize.T-MMB has taken all factors into consideration the frequency resource, the receiver complexity, factor such as the availability of frequency spectrum and systematic function, the complete compatibility of realization and DAB and T-DMB, low-cost design, low power dissipation design, frequency availability be good, support to move reception, single frequency network realization, spectral efficient, multi-service, high-quality service etc.It has following several characteristic:
(1) the T-DMB system of complete compatible Eureka-147 (DAB) and Korea S.
(2) adopted high order modulation, channel efficiency is higher than the DAB system.
(3) the senior channel error correction coding LDPC sign indicating number and the DAPSK modulation scheme of high-efficient low-complexity have been adopted.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned China mobile multi-media broadcasting technology, on the basis of Compatiable DAB and T-DMB system, use for reference the latest technological achievements of the communications field, a kind of ground mobile multimedia (Terrestrial Mobile Multimedia Broadcasting, the T-MMB) implementation method of transmission system are provided.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of in the T-MMB system transmission implementation method of compatible multistandard, may further comprise the steps:
1. keep DAB and T-DMB system configuration constant, the T-MMB business datum is independently carried out source encoding, chnnel coding, time-interleaved and modulation, and DAB, DAB-IP, T-DMB and T-MMB business datum are embedded in the DAB main business channel (MSC) in time-multiplexed mode;
In fast information channel in dab receiver (FIC), increase indication, send subsequent module for processing to form transmission frame MSC and FIC data, send according to predetermined frequency band through rf modulations then with preassigned pattern to the T-MMB business;
DAB, DAB-IP and T-DMB receiver are handled the corresponding service signal respectively, and the T-MMB receiver can be handled multichannel service signals such as DAB, DAB-IP, T-DMB and T-MMB, and the T-MMB receiver also can receive separately handles the T-MMB service signal.
2. according to the described method of step 1, when type of service was the T-MMB business, the described channel coding method that the business datum that receives is carried out was: cascaded code or low-density checksum LDPC sign indicating number.
3. according to the described method of step 1, when type of service was the T-MMB business, the time-interleaved scheme that the data after the chnnel coding are carried out was independent of the DAB system.
4. according to the described method of step 1, describedly embed the data after time-interleaved among the MSC MSC of DAB system in time-multiplexed mode, when type of service is the T-MMB business,, determine the size of capacity corresponding unit CU among the MSC according to the modulation system of business datum.
5. according to the described method of step 4, when type of service is the T-MMB business, the size of corresponding CU is among described definite MSC: n * 32bits, wherein on behalf of business datum, n=2 use the DQPSK modulation system, on behalf of business datum, n=3 use the 8DPSK modulation system, and on behalf of business datum, n=4 use the 16DAPSK modulation system.
6. according to the described method of step 1, further comprise: expand in FIC among the FIG type 0 mode of extension 2-FIG0/2 the definition of audio service component type (ASCTy) and DSCTy (DSCTy), the concrete implication of each field is with reference to ETSI EN 300 401 V1.4.1 (2006-06) among the FIG0/2.
7. according to the described method of step 1, further comprise: expand in FIC among the FIG type 0 mode of extension 13-FIG0/13 the definition of user's application message (User Application Type) and user's application data (UserApplication Data), the concrete implication of each field is with reference to ETSI EN 300 401V1.4.1 (2006-06) among the FIG0/13.
8. according to the described method of step 1, further comprise: newly-increased FIG type expansion in FIC, the subchannel characteristic of description T-MMB business.
9. according to the described method of step 1, it is characterized in that further comprising: newly-increased FIG type expansion in FIC, the positional information that the T-MMB business adopts LDPC coding time block code block is described.
10. according to the described method of step 1, send subsequent module for processing to form transmission frame MSC and FIC data, send according to predetermined frequency band through rf modulations then with preassigned pattern.
11. according to the described method of step 1, further comprise: DAB, DAB-IP and T-DMB receiver are handled signal separately respectively; The T-MMB receiver extracts professional indication information to FIC decoding back from FIG, can handle multichannel service signals such as DAB, DAB-IP, T-DMB and T-MMB; The T-MMB receiver also can receive separately handles the T-MMB service signal.
Description of drawings
Fig. 1 is the T-MMB system transmissions implementation method flow chart of Compatiable DAB of the present invention and T-DMB.
Fig. 2 is the theory diagram of T-MMB transmission implementation method of the present invention.
Fig. 3 organizes configuration structure for the basic service that adopts among the transmission method embodiment of the present invention.
The user application message configuration structure of Fig. 4 for adopting among the transmission method embodiment of the present invention.
The subchannel information configuration structure of Fig. 5 for adopting among the transmission method embodiment of the present invention.
The block encoding configuration structure of Fig. 6 for adopting among the transmission method embodiment of the present invention.
Fig. 7 is a T-MMB system transmissions frame structure schematic diagram of the present invention.
Fig. 8 is a T-MMB system transmissions frame forming process schematic diagram of the present invention.
Fig. 9 is a T-MMB receiver block diagram of the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.
In the following description, the part identical with DAB and T-DMB repeats no more, and introduces the part that is different from DAB and T-DMB in the T-MMB system.
Fig. 1 is the overview flow chart of the T-MMB transmission method of Compatiable DAB of the present invention.As shown in Figure 1, this method comprises:
Fig. 2 is the theory diagram of T-MMB transmission implementation method of the present invention.As shown in Figure 2, transmitting of T-MMB system can be synthetic by four road signals: the DAB signal, the DAB-IP signal, T-DMB signal and T-MMB signal, wherein T-MMB, T-DMB and DAB-IP signal are with among the professional MSC MSC that embeds DAB independently, give subsequent module for processing together with the data of FIC then and form transmission frame, send then through rf modulations again.
Fig. 3 organizes configuration structure for the basic service that adopts among the transmission method embodiment of the present invention.Among the figure the concrete implication of each field referring among ETSI EN 300 401 V1.4.1 (2006-06) to the description of FIG0/2.When transmission T-MMB service signal, describe below in FIG0/2, increasing newly:
-ASCTy (audio service component type): the type of the professional composition of this 6 bit regions indicative audio.Be defined as follows (remaining type keeps for using in the future):
000011：MPEG-4?HE?AAC?V2?HE-AAC；
000100：MPEG-4?ER-BSAC。
-DSCTy (DSCTy): the type of the professional composition of this 6 bit designation data.This part specific explanations is seen TS 101 756, the definition of table2.Be defined as follows:
The indication of 011001:T-MMB system.
The user application message configuration structure of Fig. 4 for adopting among the transmission method embodiment of the present invention.Among the figure the concrete implication of each field referring among ETSI EN 300 401 V1.4.1 (2006-06) to the description of FIG0/13.When transmission T-MMB service signal, describe below in FIG0/13, increasing newly:
-User Application Type (user's application type): this 11 bit has provided needs the user of decoding to use, and these application are identified by professional label (SId) and professional composition label (SCId), and it defines with reference to TS 101 756 tables 16.In the new system this option is expanded, specific as follows:
The business of 0x00b:T-MMB system
-User Application data (user's application data): this m * 8 Bit datas are used for transmission user application message data, are determined by user's application type during decoding.The Video service framework 1 of T-MMB system, framework 2 can be respectively identified by the service attribute of system, and be specific as follows:
VideoServiceObjectProfileId＝0x01
VideoServiceObjectProfileId＝0x02。
The subchannel information configuration structure of Fig. 5 for adopting among the transmission method embodiment of the present invention.Adopt FIG0/15 to describe the subchannel information of T-MMB business in an embodiment of the present invention.The implication of each field is as follows among the figure:
SubChId (subchannel identifier): the signless binary number of this 6 bit is used for identifying certain subchannel.
Start Address (initial address): this 10 bit regions is encoded to signless binary number (scope 0 to 863), the address of pointing out first capacity unit (CU) in the subchannel.
ModuType (modulation type): this 2 bit is used to refer to the DQPSK/8DPSK/16DAPSK modulation system, and is as follows:
00：DQPSK；
01：8DPSK；
10：16DAPSK；
11: keep.
CodingType (type of coding): this 1 bit is used to refer to channel coding method, and is as follows:
The 0:RS concatenated convolutional coding;
The 1:LDPC coding.
Rfu: this 1 bit is that interpolation in the future keeps.Before definition, be made as 0.
Sub-channel field (subchannel zone): this 12 bit has been indicated the size and the chnnel coding code check of subchannel.
-PL (protection level): this 2 bit has been indicated the chnnel coding code check, and is as follows:
00: protection level 1-C, expression chnnel coding code check is 1/2;
01: protection level 2-C, expression chnnel coding code check is 2/3;
Other be that in the future use keeps.
-Sub-channel Size (sub-channel size): this 10 bit regions is encoded to signless binary number (scope 1 to 864), has provided the capacity unit number that the subchannel that draws according to modulation system and protection level takies.
The block encoding configuration structure of Fig. 6 for adopting among the transmission method embodiment of the present invention.Adopt FIG0/30 to describe the subchannel information of block encoding piece in the T-MMB system in an embodiment of the present invention.The implication of each field is as follows among the figure:
-SubChId (subchannel identifier): this 6 bit regions is encoded to signless binary number, is used for identifying certain subchannel;
-Rfu: this 3 bit is to use in the future to keep, and is set to 0 at present;
-FEC Start Address (FEC initial address): this 7 bit regions is encoded to signless binary number, is used to refer to the initial address that belongs to first encoding block of this subchannel in the corresponding public interleaving frame.
Fig. 7 is a T-MMB system transmissions frame structure schematic diagram of the present invention.As shown in the figure, a transmission frame of T-MMB system is by synchronizing channel (Sync), and fast information channel in dab receiver (FIC) and MSC (MSC) constitute.MSC is because several public interleaving frames (CIF) composition.
Fig. 8 is a T-MMB system transmissions frame forming process schematic diagram of the present invention.The T-MMB business datum is according to transmission mode I as shown in the figure, the transmission of employing stream mode, the professional multimedia data stream of T-MMB according to the indication information of FIC through LDPC coding and time-interleaved (Bit Interleave) afterwards, with CU is that unit is inserted among the MSC MSC, business such as DAB, DAB-IP and T-DMB are inserted into MSC according to the indication information of FIC according to original handling process, form a transmission frame of finishing through subsequent module for processing together with synchronizing channel and fast information channel in dab receiver then.
Fig. 9 is a T-MMB receiver block diagram of the present invention.As shown in the figure, the step of receiving terminal comprises: radio demodulating, and the OFDM demodulation, business datum is extracted, channel decoding and source decoding.Idiographic flow is as follows:
Step 910 and step 911 receive data, and carry out radio demodulating and OFDM demodulation, obtain transmission frame.
In this step, radio demodulating and the OFDM demodulation of carrying out corresponding reception data according to the method for DAB system get final product, and repeat no more here.
In this step, receiver at first obtains the professional indication information of transmitting terminal according to FIG0/2: service identification (SId), transmission mode sign (TMId), subchannel sign information such as (SubChId).
Receiver utilizes the relevant information of FIG0/2 to remove to search FIG0/1, FIG0/3, FIG0/13 and FIG0/15 again.The particular content of FIG0/1 and FIG0/3 is referring to ETSI EN 300 401 V1.4.1 (2006-06).
Receiver can be in FIG0/13 user's application type (User Application Type) and user's application data (User Application data) in obtain information about Added Business indication and source encoding.
The T-MMB receiver obtains about information such as subchannel sign, initial address, modulation type, type of coding and the sub-channel size of Added Business and protection class by FIG0/15.
What the T-MMB receiver judged that transmitting terminal adopts according to type of coding among the FIG0/15 (Coding Type) is RS+ convolutional encoding or LDPC coding, if adopt the LDPC coding also to need to indicate with FIG0/30 the positional information of encoding block.FEC Start Address field is used for being used to refer to the initial address that corresponding public interleaving frame belongs to first encoding block of this subchannel among the FIG0/30.
Step 913 according to the information of extracting in the step 912 such as FIG0/2, FIG0/1, FIG0/3, FIG0/15 and FIG0/30, is carried out channel-decoding to the related service data.
Step 914 utilizes information such as FIG0/13 that the dateout of step 913 is carried out source coding.
Because DAB signal and T-DMB signal transmission structure remain unchanged, therefore, when the user was DAB, DAB-IP or T-DMB receiver, receiver can be handled the corresponding service signal, but can not handle the T-MMB service signal.And the T-MMB receiver can be handled DAB, DAB-IP, T-DMB and four kinds of service signals of T-MMB, also can individual processing T-MMB service signal, so, the complete Compatiable DAB of T-MMB system, DAB-IP and T-DMB system.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the transmission implementation method of a compatible multistandard in ground mobile multimedia broadcast (T-MMB) comprises:
Keep DAB and T-DMB system configuration constant, the T-MMB business datum is independently carried out source encoding, chnnel coding, time-interleaved and modulation, and DAB, DAB-IP, T-DMB and T-MMB business datum are embedded in the DAB main business channel (MSC) in time-multiplexed mode;
In fast information channel in dab receiver (FIC), increase indication, send subsequent module for processing to form transmission frame MSC and FIC data, send according to predetermined frequency band through rf modulations then with preassigned pattern to the T-MMB business;
DAB, DAB-IP and T-DMB receiver are handled the corresponding service signal respectively, and the T-MMB receiver can be handled multichannel service signals such as DAB, DAB-IP, T-DMB and T-MMB, and the T-MMB receiver also can receive separately handles the T-MMB service signal.
2. according to claim 1 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, it is characterized in that, when type of service was the T-MMB business, the described channel coding method that the business datum that receives is carried out was: cascaded code or low-density checksum LDPC sign indicating number.
3. according to claim 1 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, it is characterized in that, when type of service was the T-MMB business, the time-interleaved scheme that the data after the chnnel coding are carried out was independent of the DAB system.
4. according to claim 1 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, it is characterized in that, describedly embed the data after time-interleaved among the MSC MSC of DAB system in time-multiplexed mode, when type of service is the T-MMB business, according to the modulation system of business datum, determine the size of capacity corresponding unit CU among the MSC.
5. according to claim 4 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, it is characterized in that, when type of service is the T-MMB business, the size of corresponding CU is among described definite MSC: n * 32bits, wherein on behalf of business datum, n=2 use the DQPSK modulation system, on behalf of business datum, n=3 use the 8DPSK modulation system, and on behalf of business datum, n=4 use the 16DAPSK modulation system.
6. according to claim 1 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, it is characterized in that further comprising: expand in fast information channel in dab receiver (FIC) among the FIG type 0 mode of extension 2-FIG0/2 the definition of audio service component type (ASCTy) and DSCTy (DSCTy), the concrete implication of each field is with reference to ETSI EN300 401V1.4.1 (2006-06) among the FIG0/2.
7. according to claim 1 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, it is characterized in that further comprising: expand in FIC among the FIG type 0 mode of extension 13-FIG0/13 the definition of user's application message (User Application Type) and user's application data (User Application Data), the concrete implication of each field is with reference to ETSI EN300 401 V1.4.1 (2006-06) among the FIG0/13.
8. according to claim 1 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, it is characterized in that further comprising: newly-increased FIG type expansion in FIC, the subchannel characteristic of T-MMB business is described.
9. according to claim 1 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, it is characterized in that further comprising: newly-increased FIG type expansion in FIC, the positional information that the T-MMB business adopts LDPC coding time block code block is described.
10. according to claim 1 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, send subsequent module for processing to form transmission frame MSC and FIC data with preassigned pattern, send according to predetermined frequency band through rf modulations then.
11. according to claim 1 a kind of in ground mobile multimedia broadcast (T-MMB) the transmission implementation method of compatible multistandard, it is characterized in that further comprising: DAB, DAB-IP and T-DMB receiver are handled signal separately respectively; The T-MMB receiver extracts professional indication information to FIC decoding back from FIG, can handle multichannel service signals such as DAB, DAB-IP, T-DMB and T-MMB; The T-MMB receiver also can receive separately handles the T-MMB service signal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102342027A (en) * | 2009-03-03 | 2012-02-01 | 交互数字专利控股公司 | Method for a radio frequency (RF) sampling apparatus with arrays of time interleaved samplers and scenario based dynamic resource allocation |
| CN104486033A (en) * | 2014-12-03 | 2015-04-01 | 重庆邮电大学 | Downlink multimode channel coding system and method based on C-RAN platform |
-
2006
- 2006-12-08 CN CN 200610161929 patent/CN101022436A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102342027A (en) * | 2009-03-03 | 2012-02-01 | 交互数字专利控股公司 | Method for a radio frequency (RF) sampling apparatus with arrays of time interleaved samplers and scenario based dynamic resource allocation |
| CN102342027B (en) * | 2009-03-03 | 2014-06-18 | 交互数字专利控股公司 | Method for a radio frequency (RF) sampling apparatus with arrays of time interleaved samplers and scenario based dynamic resource allocation |
| US9014124B2 (en) | 2009-03-03 | 2015-04-21 | Interdigital Patent Holdings, Inc. | Radio frequency (RF) sampling apparatus with arrays of time interleaved samplers and scenario based dynamic resource allocation |
| CN104486033A (en) * | 2014-12-03 | 2015-04-01 | 重庆邮电大学 | Downlink multimode channel coding system and method based on C-RAN platform |
| CN104486033B (en) * | 2014-12-03 | 2017-09-29 | 重庆邮电大学 | A kind of descending multimode channel coded system and method based on C RAN platforms |
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