CN101729199A - Code cascading scheme of digital broadcasting system - Google Patents
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- CN101729199A CN101729199A CN200810224329A CN200810224329A CN101729199A CN 101729199 A CN101729199 A CN 101729199A CN 200810224329 A CN200810224329 A CN 200810224329A CN 200810224329 A CN200810224329 A CN 200810224329A CN 101729199 A CN101729199 A CN 101729199A
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Abstract
The invention provides a code cascading scheme of a digital broadcasting system. A transmission method of the code cascading scheme of the digital broadcasting system comprises the following steps: acquiring a multimedia service data stream; encoding the multimedia service data stream by adding a piece of checking information to obtain an outer code encoded data stream; performing erasable convolutional encoding on the outer code encoded data stream to obtain an inner code encoded data stream; encapsulating the inner code encoded data stream into an assembly signal; and transmitting the assembly signal. The encoding scheme with high-gain error-correcting performance provided by the invention can obtain better signal-to-noise ratio in transmission at a threshold similar to an audio service of digital audio broadcasting and improve the effective transmission data rate of the multimedia broadcasting system.
Description
Technical field
The present invention relates to the broadcast technology field, in particular, relate to the cascaded code method of multi-media broadcasting system, and the cascaded code device of digital multimedia broadcasting system.
Background technology
DMB (DMB, Digital Multimedia Broadcasting) system comprises digital audio, video many aspects; Advantage such as digital audio broadcasting has that tonequality is good, the availability of frequency spectrum is high, can realize large-area single frequency network covering, receiver sensitivity height, mobile receptivity are good, and can in the transmission of audio business, transmit diversified value added data business.
Be to guarantee the quality of audio service, the error code quantity that should guarantee the voice data that transmitted is below certain error code scope, yet in the ordinary course of things, through after the channel decoding, its error rate reaches 10 to audio quality in audio data transmission
-4Magnitude, apparent in view noise can appear in decoded audio frequency, better broadcast listening.
For addressing the above problem; existing DAB system uses can delete convolution code (RCPC) as its forward error correction (FEC) encoding scheme; under the situation of outdoor mobile reception, using clean code check is that 1/2 deleted convolution code is protected MUSICAM (a kind of digital audio and video signals) audio service.
Yet this error protection scheme in the ground digital audio droadcasting system only is aimed at this specific voice data of MUSICAM, and the error code susceptibility of video traffic data is often far above audio service, and this data flow can only be lower than 10 in the error rate
-6To 10
-8Magnitude can guarantee continuous broadcast.
For being implemented in synchronous transmission video traffic data in the DAB system, it mainly is to have increased RS coding and convolutional interleave on the deleted convolutional encoding basis of ground digital audio system, constituted a kind of code cascading scheme, be T-DMB (Terrestrial Digital Multimedia Broadcasting, T-DMB) system, by fixedly the ISN code check is constant, increase the error-correcting performance that the RS sign indicating number improves system, this T-DMB system can guarantee the transmission of video traffic data, because the error-correcting performance of this code cascading scheme is lower, and when causing the T-DMB systematic function to improve, the effective efficiency of transmission of T-DMB system descends.
Increased the code cascading scheme that RS (204,188) encodes as the T-DMB system on the basis of the deleted convolution code of 1/2 code check of DAB system, then T-DMB system valid data transmission rate is:
As can be seen, the relative DAB of T-DMB system valid data transmission rate system (0.5) has reduced by 4%.
In a word, need the urgent technical problem that solves of those skilled in the art to be exactly: how to keep under the prerequisite with existing ground digital audio broadcasting compatibility, improve effective transmission data rate of DAB system, and further improve spectrum utilization efficiency, realize higher video and the data service of transmission error code susceptibility under the thresholding close with ground digital audio broadcasting audio service.
Summary of the invention
Technical problem to be solved by this invention provides a kind of encoding scheme with high-gain error-correcting performance, and can improve the code cascading scheme of digit broadcasting system of effective transmission data rate of DMB system.
In order to address the above problem, the invention discloses a kind of sending method of code cascading scheme of digit broadcasting system, this sending method comprises,
Obtain multimedia service data stream;
Adopt the mode of additional check information to encode to described multimedia service data stream, obtain outer sign indicating number encoded data stream;
Described outer sign indicating number encoded data stream is carried out deleting convolution coding, obtain inner code encoded data stream;
Described inner code encoded data stream is encapsulated as the assembly signal;
Send described assembly signal.
Further, the mode of described additional check information is the LDPC coded system.
Further, the mode of described additional check information is the Turbo coded system.
Further, described multimedia service data stream is the video data of synchronous multiplexing and voice data.
In order to address the above problem, the invention also discloses a kind of method of reseptance of code cascading scheme of digit broadcasting system, this method of reseptance comprises,
Receive the assembly signal;
To the decapsulation of described assembly signal, obtain inner code encoded data stream;
Described inner code encoded data stream is carried out deleting convolutional code decoder, and sign indicating number encoded data stream outside obtaining, described outer sign indicating number encoded data stream are the multimedia service data stream according to the additional check information of default coded system acquisition;
Adopt the decoded mode corresponding that described additional check information is carried out verification,, extract described multimedia service data stream if verification is correct with described coded system.
Further, this method of reseptance also comprises: to the decoding or the broadcast of described multimedia service data stream.
Further, this method of reseptance also comprises:
If verification is incorrect, then the part of makeing mistakes of described additional check information is carried out decoding and the error correction corresponding with described default coded system.
Further, described decoded mode is the decoding of LDPC coding.
Further, described decoded mode is the decoding of Turbo coding.
Further, described multimedia service data stream is the synchronization video data and the voice data of demultiplexing.
In order to address the above problem, the invention also discloses a kind of emitter of code cascading scheme of digit broadcasting system, this emitter comprises:
Acquiring unit is used to obtain the multimedia service data stream that needs protection;
Outer sign indicating number coding unit is used for adopting the mode of additional check information to encode to described multimedia service data stream, obtains outer sign indicating number encoded data stream;
The ISN coding unit carries out deleting convolution coding to described outer sign indicating number encoded data stream, obtains inner code encoded data stream;
Encapsulation unit is used for described inner code encoded data stream is encapsulated as the assembly signal;
Transmitting element is used to send described assembly signal.
Further, described outer sign indicating number coding unit is:
The LDPC coding unit is used for described multimedia service data stream is carried out the LDPC coding, generates the additional check information of corresponding described LDPC encryption algorithm simultaneously.
Further, described outer sign indicating number coding unit is:
The Turbo coding unit is used for described multimedia service data stream is carried out the Turbo coding, generates the additional check information of corresponding described Turbo encryption algorithm simultaneously.
Further, described emitter also comprises:
Multiplexing Unit is used for synchronized video data and voice data are multiplexed into described multimedia service data stream.
In order to address the above problem, the invention also discloses a kind of receiving system of code cascading scheme of digit broadcasting system, this receiving system comprises:
Receiving element is used to receive the assembly signal;
Decapsulation unit is used for the decapsulation of described assembly signal is obtained inner code encoded data stream;
The inner decoding unit is used for described inner code encoded data stream is carried out deleting convolutional code decoder, and sign indicating number encoded data stream outside obtaining, described outer sign indicating number encoded data stream are the multimedia service data stream according to the additional check information of default coded system acquisition;
Verification unit is used to adopt the decoded mode corresponding with described coded system that described additional check information is carried out verification, if additional check information is correct, extracts described multimedia service data stream.
Further, this receiving system also comprises:
Broadcast unit is used for decoding or broadcast to described multimedia service data stream.
Further, this receiving system also comprises:
Decoding unit, it is incorrect to be used for described additional check information, then the part of makeing mistakes is carried out and the corresponding decoding of described default coded system;
Error correction unit is used for the part of makeing mistakes of described additional check information is carried out error correction.
Further, described decoding unit is the decoding of additional check information of the coded system correspondence of LDPC sign indicating number.
Further, described decoding unit is the decoding of additional check information of the coded system correspondence of Turbo code.
Further, described receiving system also comprises:
It is synchronized video data and voice data that demultiplexing unit, described demultiplexing unit are used for described multimedia service data stream demultiplexing.
Compared with prior art, the present invention has the following advantages:
The sending method of the code cascading scheme of digit broadcasting system provided by the invention can higher video and the data service of transmission error code susceptibility, mainly be by increasing the coded system that presets that the mode that can adopt additional check information encodes can deleting on the convolution coding basis, utilize the forward error correction coding of high-gain and can delete convolution coding and constitute cascaded code, when increasing forward error correction coding, improve and to delete the encoder bit rate of convolution code, and effectively improve the efficiency of transmission of entire system; This presets coded system can be LDPC (Low Density Parity Check, low-density checksum) coding or Turbo coded system; Described two kinds of coded systems have excellent error-correcting performance, and compensation is owing to can delete the loss that the convolution code code check improves the transmission performance of bringing.
Moreover, by deleting convolution code and LDPC coding or Turbo coding cascade code method, make that the signal to noise ratio of transmitting is better under the close thresholding of digital audio broadcasting audio service, and described cascaded code method be a kind of easy to implement, can the higher multimedia service data of transmission error code susceptibility.
Description of drawings
Fig. 1 is the schematic flow sheet of the sending method embodiment of a kind of digit broadcasting system of the present invention;
Fig. 2 is the structure drawing of device of a kind of digit broadcasting system of the present invention and existing DAB systematic collaboration
Fig. 3 is the schematic flow sheet of the method for reseptance embodiment of a kind of digit broadcasting system of the present invention;
Fig. 4 is the structural representation of the emitter embodiment of a kind of digit broadcasting system of the present invention;
Fig. 5 is the structural representation of the receiving system embodiment of a kind of digit broadcasting system of the present invention;
Fig. 6 is the synchronized transmission of a kind of digit broadcasting system of the present invention and the apparatus structure schematic diagram that receives synchronously.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The core idea of the embodiment of the invention is, by increasing the coded system that presets that the mode that can adopt additional check information encodes can deleting on the convolution coding basis, this presets forward error correction coding that coded system utilizes high-gain and can delete convolution coding and constitute new cascaded code, this cascaded code can be under close system's threshold level, improve when increasing forward error correction coding and can delete the encoder bit rate of convolution code, and effectively improve the efficiency of transmission of entire system; This presets coded system can be LDPC coding or Turbo coded system; Because two kinds of coded systems have excellent error-correcting performance, compensation can be deleted the convolution code code check and be improved the transmission performance loss that brings.
With reference to shown in Figure 1, the schematic flow sheet of the sending method embodiment of a kind of digit broadcasting system of the present invention; A kind of sending method of digit broadcasting system comprises,
Step 101: obtain multimedia service data stream;
Wherein, described multimedia service data stream can be the video data and the voice data of synchronous multiplexing, can further include additional video presentation information; In addition, described multimedia service data stream can also for comprise MPEG-4, H.264, the video data stream of different modes such as MPEG-2, AVS.
In specific implementation, can obtain described multimedia service data stream by following substep:
Substep A1, video data stream is compressed, and inserted described video data stream add description or extra additional data;
Video data stream, the additional data of substep A2, compression synchronously;
Substep A3, this synchronized video data stream is carried out video coding, form multimedia service data stream.
Certainly, those skilled in the art can adopt that different modes obtains video data source, audio data sources in the prior art, for example, record and the digital video frequency flow of compressing and converting via video camera; Or obtain the voice data that CD records.
Step 102: adopt the mode of additional check information to encode to described multimedia service data stream, obtain outer sign indicating number encoded data stream; The mode of described additional check information can be LDPC coded system or Turbo coded system, promptly increases a certain proportion of additional check information by certain algorithm on protected data; Wherein, the algorithm of described LDPC coded system can be the generator matrix by the specific code length of design, and the information bit that needs multimedia service data stream draws pairing additional check information by the computing of binary multiplication;
Behind the LDPC coding, multimedia messages that needs protection and check information are to separate sequential delivery, and promptly the last partial data of a LDPC frame is the multi-medium data that needs protection, and a back part is the check information of LDPC coding.
The algorithm of described Turbo coded system can be the in parallel or series connection with two or more convolution coders, then must bit information according to specific redundant arithmetic deletion with the coded message of its each self-generating, and in the convolution coder cataloged procedure, obtain redundant information, i.e. the check information of Turbo coding;
After the Turbo code coding, the redundant information that multimedia service data stream that needs protection and coding generate mixes transmission.
Step 103: described outer sign indicating number encoded data stream is carried out deleting convolution coding, obtain inner code encoded data stream.
Preferably, in embodiments of the present invention, described mode of deleting convolution coding can be, the coded sequence of being exported continuously by the information sequence of continuous input; Be that described outer sign indicating number encoded data stream compiles k information code element via the encoder for convolution codes deleted of a plurality of serial or parallel connections be n code element;
A described n code element is not only individual information-related with the k of present segment, and relevant with (m-1) segment information of front (m is the constraint length of coding);
Can delete convolutional encoding carry out coded data stream can for, carry out encoded data stream via the LDPC coded system, promptly (m-1) segment information is encoded via the LDPC coded system, and then described (m-1) segment information comprises the multi-medium data that needs protection and the check information of the LDPC coding that generates via the LDPC coding;
Can delete convolutional encoding carry out coded data stream can also for; carry out encoded data stream via the Turbo coded system; promptly (m-1) segment information forms via the Turbo coded system, and then described (m-1) segment information comprises the multi-medium data that needs protection and the check information of the Turbo coding that generates via the Turbo coding.
Wherein, multimedia data stream carried out LDPC coding/Turbo coding after, in conjunction with the scheme that can delete convolution coding, promptly constitute new cascaded code encoding scheme again.
Step 104: described inner code encoded data stream is encapsulated as the assembly signal;
In practice, this process can also comprise, carries out multiplexing to inner code encoded data stream, inner code encoded data stream after multiplexing is packaged into the ETI frame, adopt ground digital audio broadcasting standard that this ETI data flow frame is modulated, obtain baseband modulation signal, i.e. assembly signal.
Step 105: send described assembly signal.
In the specific implementation process, utilize the sending method of digital multimedia broadcasting system of the present invention (HE-DMB), promptly can effectively improve the efficiency of transmission of entire system by LDPC coding/Turbo coding and the new code cascading scheme that can delete the convolution coding formation;
For example, if utilize to use the LDPC sign indicating number of code check 4/5 or 9/10 be forward error correction coding as sign indicating number system outside, the while can be deleted the code check of convolution coding and can be brought up to 2/3, then the efficiency of transmission of entire system is:
R
HE-DMB＝R
RCPC×R
LDPC＝2/3×4/5≈0.53
Or R
HE-DMB=R
RCPC* R
LDPC=2/3 * 9/10 ≈ 0.6.
As can be seen, the overall transfer efficient of HE-DMB of the present invention system has improved 17% to 30% than the entire system efficient (0.46) of T-DMB system respectively, simultaneously, new cascaded code system's threshold level of increase of the present invention LDPC coding and existing ground digital audio droadcasting system and T-DMB system to accept thresholding close.
Therefore, new code cascading scheme of the present invention has kept the compatible good advantage of traditional ground digital audio broadcast system, overcome the shortcoming that the whole effectively transmission data rate of its ground digital audio droadcasting system reduces simultaneously, that is to say, when improving the entire system effective speed, guaranteed favorable compatibility with original DMB system.
The sending method that Fig. 2 illustrates a kind of digit broadcasting system of the present invention is preferred embodiment more, is the flow chart of the sending method of a kind of digit broadcasting system of the present invention and existing DMB systematic collaboration,
A kind of digital multimedia broadcasting system of the present invention (HE-DMB) sending method comprises, obtain multi-medium data source 216, described multi-medium data source 216 is compressed, carry out video coding 215 and audio coding 214 respectively, video and audio frequency behind the coding are carried out multimedia service multiplexing 213, multi-medium data via multimedia service after multiplexing carries out outer sign indicating number coding with the LDPC coded system again, obtain LDPC coded data stream, this LDPC coded data stream comprises the check information of multi-medium data and LDPC coding, this LDPC coded data stream by deleting convolution coding, is obtained inner code encoded data stream; And inner code encoded data stream is packaged into the ETI frame;
Existing DMB system 200 pattern of traffic as shown in Figure 2 is, obtain audio-source 201, audio-source 201 is compressed, and carry out audio coding 203, in the additional synchronously data 202 of audio coding 203, described audio coding 203 and additional data 202 are carried out service integration 204;
The multi-medium data that voice data after existing DMB system 200 is multiplexing and the present invention are packaged into the ETI frame carries out the assembly signal multiplexing, and transmit multiplexing assembly signal, simultaneously multiplexing assembly signal is carried out DMB modulation and filtering amplification, send via transmitter.
Wherein, in the assembly signal multiplexing process of HE-DMB of the present invention system 217, be configured, make it can mate the standard of assembly signal multiplexing by the adaptive 210 pairs of ETI frames of ETI.
In described assembly signal multiplexing process, the ETI frame of the data flow of the audio-source of existing DMB system and HE-DMB of the present invention system is held, can form new ETI frame automatically by the order of priority of user's definition.
Existing DMB system 200 and HE-DMB of the present invention system 217 another kind of collaborative modes can for, the ETI frame that HE-DMB of the present invention system forms is configured via ETI adaptive 210, and carries out in the service integration process of existing DMB system.
In the specific implementation process, require the business of low error rate for video traffic etc., perhaps when traditional DMB can not guarantee the transmission quality of audio service, will handle according to the professional handling process of digital broadcasting multimedia system of the present invention (HE-DAB); Be multimedia service data and at first pass through outer sign indicating number encode processor, promptly adopt the encoding process of LDPC encryption algorithm, secondly carry out data multiplex through deleting convolution coding, transferring to MSC, can transmit the multichannel business datum simultaneously in this MSC (MSC), the data encapsulation of this MSC after to described coding becomes the assembly signal, and sends.
Fig. 3 then illustrates the schematic flow sheet of the method for reseptance embodiment of a kind of digit broadcasting system of the present invention, and its receiving step comprises:
Step 301: receive the assembly signal;
Step 302:, obtain inner code encoded data stream to the decapsulation of described assembly signal;
Wherein, described assembly signal is carried out demodulation, obtain demodulated baseband signal, described demodulated baseband signal is carried out demultiplexing, obtain comprising the ETI frame of inner code encoded data stream, the described ETI frame that comprises inner code encoded data stream is carried out decapsulation, obtain inner code encoded data stream.
Step 303: described inner code encoded data stream is carried out deleting convolutional code decoder, obtain outer sign indicating number encoded data stream,
Wherein, the described convolutional code decoder sign indicating number of deleting is, extracts decoding information in the code character to the inner code encoded data stream that receives; Decoding information is deciphered, and verification, if verification is incorrect, the multi-medium data of decoding information correspondence is carried out error correction, if the decoding information verification is correct, sign indicating number encoded data stream outside obtaining, described outer sign indicating number encoded data stream are the multimedia service data stream according to the additional check information of default coded system acquisition;
Can delete convolutional code decoder and be used for correcting random error in the multi-medium data transmission course, reduce the error rate of the multimedia data stream that needs protection.
Step 304: adopt the decoded mode corresponding that described additional check information is carried out verification with described coded system; If verification is correct, then carry out step 305: extract described multimedia service data stream;
If verification is incorrect, then the part of makeing mistakes of described additional check information is carried out decoding and the error correction corresponding with described default coded system, and then can extract described multimedia service data stream.
In concrete outer code decoder process, described decoded mode can be the decoding of LDPC coding, decode procedure corresponding to the LDPC encryption algorithm, whether the check information of judging described LDPC coding is correct, if the check information of LDPC coding is incorrect, then need carry out error correction to the multimedia data stream of the part correspondence of makeing mistakes of the check information of this LDPC coding; And then extract described multimedia service data and flow.
Another decoded mode can also for, the decoding of Turbo coding, decode procedure corresponding to the Turbo encryption algorithm, also be to judge whether the check information of described Turbo coding is correct, if the check information of Turbo coding is incorrect, then need carry out error correction to the multi-medium data of the part correspondence of makeing mistakes of the check information of this Turbo coding; And then extract described multimedia service data and flow.
Further: the method for reseptance of this digital multimedia broadcasting system can also comprise: to the decoding or the broadcast of described multimedia service data stream, and described multimedia service data stream can be the synchronization video data and the voice data of demultiplexing.
The forward error correction performance of the high-gain of the newly-increased outer sign indicating number of digital broadcasting multimedia method of reseptance of the present invention utilization guarantees high efficiency transmission requirement.
More than the sending method and the method for reseptance of the digital multimedia broadcasting system in the embodiment of the invention are described in detail; For simple description, thus it all is expressed as a series of combination of actions, but those skilled in the art should know that the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the specification all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
Below dispensing device and the receiving system in the face of digital multimedia broadcasting system of the present invention describes in detail respectively.
With reference to shown in Figure 4, the structural representation of the dispensing device embodiment of a kind of digit broadcasting system of the present invention, this dispensing device comprises:
Acquiring unit 401 is used to obtain the multimedia service data stream that needs protection;
Outer sign indicating number coding unit 402 is used for adopting the mode of additional check information to encode to described multimedia service data stream, obtains outer sign indicating number encoded data stream;
In concrete dispensing device, outer sign indicating number coding unit can be the LDPC coding unit, is used for described multimedia service data stream is carried out the LDPC coding, generates the additional check information of corresponding described LDPC encryption algorithm simultaneously; Perhaps outer sign indicating number coding unit is the Turbo coding unit, is used for described multimedia service data stream is carried out the Turbo coding, generates the additional check information of corresponding described Turbo encryption algorithm simultaneously.
Wherein, described encapsulation unit comprises, the framing subelement is used for described inner code encoded data stream is packaged into the ETI frame; Modulation subunit is used for the ETI frame is modulated; Assembly signal multiplexing subelement carries out the ETI frame of described modulation multiplexingly in assembly signal multiplexing unit, obtain the assembly signal, and transfer to MSC.
Transmitting element 405 is used to send described assembly signal.
Wherein, described transmitting element also comprises: a launch terminal, this launch terminal receives the assembly signal of MSC, and sends.
Further, the dispensing device of this digital multimedia broadcasting system can also comprise:
Multiplexing Unit is used for synchronized video data and voice data are multiplexed into described multimedia service data stream.
The emitter of digital multimedia broadcasting system of the present invention has changed the coding unit of original DMB system, forward error correction coding by utilizing high-gain with can delete convolution coding and constitute new cascaded code coding unit, when increasing forward error correction coding, improve and to delete the encoder bit rate of convolution code, and effectively improve the efficiency of transmission of entire system.
Figure 5 shows that the structural representation of the receiving system embodiment of a kind of digit broadcasting system of the present invention, this device comprises a kind of receiving system of digit broadcasting system, and this receiving system comprises:
Receiving element 501 is used to receive the assembly signal;
Wherein, receiving element 501 comprises, a receiving terminal subelement is used to receive the signal that is sent by launch terminal; The demodulator subelement is used for the assembly signal that receives is carried out demodulation, obtains demodulated baseband signal; The demultiplexing subelement of demodulated baseband signal is used for the demodulated baseband signal demultiplexing, the inner decoding data flow that obtains encapsulating, i.e. ETI frame.
Wherein decapsulation unit 502 also comprises, an ETI frame adapter is used to receive the ETI frame of assembly signal demultiplexing, be configured via ETI frame adapter, obtain carrying out the ETI frame of decapsulation, it carries out decapsulation to described ETI frame, obtains inner code encoded data stream.
If additional check information is incorrect, then enter the subelement decoding unit of verification unit 504, the part that additional check information is made mistakes is carried out and the corresponding decoding of described default coded system; And in the subelement error correction unit of verification unit 504, the part of makeing mistakes of additional check information is carried out error correction, the decoding unit of the corresponding default coded system of this error correction unit.
Wherein, this decoding unit can be the decoding unit of LDPC sign indicating number, the decoding of the LDPC code check information that the coded system of corresponding LDPC sign indicating number is carried out in this unit, and in corresponding error correction unit, correct, and then extract described multimedia service data stream 505; With what extract multimedia service data stream 505 is decoded or play;
This decoding unit can also be the decoding unit of Turbo code, carries out the decoding of Turbo code in the decoding unit of Turbo code, the Turbo code check information of makeing mistakes is corrected in corresponding error correction unit, and then extracted described multimedia service data stream 505; With what extract multimedia service data stream 505 is decoded or play.
Further, this receiving system also comprises multimedia service data stream demultiplexing unit, and being used for described multimedia service data is flowed 505 demultiplexings is synchronized video data and voice data.
More preferably install embodiment as a kind of digit broadcasting system of the present invention, Fig. 6 illustrates the synchronized transmission of a kind of digit broadcasting system of the present invention and the apparatus structure schematic diagram that receives synchronously;
Audio data sources 601 and video data source 602, its voice data that comprises and video data are compressed, and carry out code synchronism separately and be multiplexed with multimedia service data and transfer to acquiring unit 603, this unit can receive a plurality of multimedia service datas that need protection and transfer in the outer sign indicating number coding unit 604, the multimedia service data stream that needs protection is carried out the check information of outer sign indicating number coding and additional corresponding outer sign indicating number encryption algorithm, obtain outer sign indicating number encoded data stream, this outer sign indicating number encoded data stream is carried out deleting convolution coding in ISN coding unit 605, obtain inner code encoded data stream; In encapsulation unit 606, described inner code encoded data stream is encapsulated, and become frame unit to form the ETI frame, transfer to the assembly signal transmission interface, via the radio-frequency (RF) transmitter modulation and launch through ETI;
For making those skilled in the art understand the present invention better, this Fig. 6 shows by radio-frequency transmitter and receives the assembly signal, carry out decapsulation via 607 pairs of described assembly signals of decapsulation unit, again by adopting ground digital audio broadcasting standard to carry out demodulation, obtain demodulated baseband signal, pass through the demultiplexing unit of demodulated baseband signal again, obtain inner code encoded data stream, and transfer to inner decoding unit 608, be used for described inner code encoded data stream is carried out deleting convolutional code decoder, and then obtain outer sign indicating number encoded data stream;
Described outer sign indicating number encoded data stream is deciphered according to the additional check information that default coded system obtains; In verification unit 609, adopt the decoded mode corresponding that described additional check information is carried out verification with described coded system, if additional check information is correct, extract described multimedia service data stream 610, if additional check information is incorrect, then enter the subelement decoding unit of verification unit, the part that additional check information is made mistakes is carried out and the corresponding decoding of described default coded system; And in the subelement error correction unit of verification unit, the part of makeing mistakes of additional check information is carried out error correction, and obtain multimedia data stream 610, obtain synchronous voice data 601 and video data 602 and play by demultiplexing.
By this constructional device, make that the signal to noise ratio of the digital broadcasting multimedia service that transmits is better under the close thresholding of digital audio broadcasting audio service, and described constructional device be a kind of easy to implement, can the higher multimedia service data device of transmission error code susceptibility.
Need to prove that what the embodiment in this specification stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
Used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (20)
1. the sending method of the code cascading scheme of a digit broadcasting system is characterized in that, comprise,
Obtain multimedia service data stream;
Adopt the mode of additional check information to encode to described multimedia service data stream, obtain outer sign indicating number encoded data stream;
Described outer sign indicating number encoded data stream is carried out deleting convolution coding, obtain inner code encoded data stream;
Described inner code encoded data stream is encapsulated as the assembly signal;
Send described assembly signal.
2. the method for claim 1 is characterized in that, the mode of described additional check information is the LDPC coded system.
3. the method for claim 1 is characterized in that, the mode of described additional check information is the Turbo coded system.
4. the method for claim 1 is characterized in that, described multimedia service data stream is the video data of synchronous multiplexing and voice data.
5. the method for reseptance of the code cascading scheme of a digit broadcasting system is characterized in that, comprise,
Receive the assembly signal;
To the decapsulation of described assembly signal, obtain inner code encoded data stream;
Described inner code encoded data stream is carried out deleting convolutional code decoder, and sign indicating number encoded data stream outside obtaining, described outer sign indicating number encoded data stream are the multimedia service data stream according to the additional check information of default coded system acquisition;
Adopt the decoded mode corresponding that described additional check information is carried out verification,, extract described multimedia service data stream if verification is correct with described coded system.
6. method as claimed in claim 5 is characterized in that, also comprises: to the decoding or the broadcast of described multimedia service data stream.
7. method as claimed in claim 5 is characterized in that, also comprises:
If verification is incorrect, then the part of makeing mistakes of described additional check information is carried out decoding and the error correction corresponding with described default coded system.
8. method as claimed in claim 5 is characterized in that, described decoded mode is the decoding of LDPC coding.
9. method as claimed in claim 5 is characterized in that, described decoded mode is the decoding of Turbo coding.
10. method as claimed in claim 5 is characterized in that, described multimedia service data stream is the synchronization video data and the voice data of demultiplexing.
11. the emitter of the code cascading scheme of a digit broadcasting system is characterized in that, comprising:
Acquiring unit is used to obtain the multimedia service data stream that needs protection;
Outer sign indicating number coding unit is used for adopting the mode of additional check information to encode to described multimedia service data stream, obtains outer sign indicating number encoded data stream;
The ISN coding unit carries out deleting convolution coding to described outer sign indicating number encoded data stream, obtains inner code encoded data stream;
Encapsulation unit is used for described inner code encoded data stream is encapsulated as the assembly signal;
Transmitting element is used to send described assembly signal.
12. device as claimed in claim 11 is characterized in that, described outer sign indicating number coding unit is:
The LDPC coding unit is used for described multimedia service data stream is carried out the LDPC coding, generates the additional check information of corresponding described LDPC encryption algorithm simultaneously.
13. device as claimed in claim 11 is characterized in that, described outer sign indicating number coding unit is:
The Turbo coding unit is used for described multimedia service data stream is carried out the Turbo coding, generates the additional check information of corresponding described Turbo encryption algorithm simultaneously.
14. device as claimed in claim 11 is characterized in that, also comprises:
Multiplexing Unit is used for synchronized video data and voice data are multiplexed into described multimedia service data stream.
15. the receiving system of the code cascading scheme of a digit broadcasting system is characterized in that, comprising:
Receiving element is used to receive the assembly signal;
Decapsulation unit is used for the decapsulation of described assembly signal is obtained inner code encoded data stream;
The inner decoding unit is used for described inner code encoded data stream is carried out deleting convolutional code decoder, and sign indicating number encoded data stream outside obtaining, described outer sign indicating number encoded data stream are the multimedia service data stream according to the additional check information of default coded system acquisition;
Verification unit is used to adopt the decoded mode corresponding with described coded system that described additional check information is carried out verification, if additional check information is correct, extracts described multimedia service data stream.
16. device as claimed in claim 15 is characterized in that, also comprises:
Broadcast unit is used for decoding or broadcast to described multimedia service data stream.
17. device as claimed in claim 15 is characterized in that, also comprises:
Decoding unit, it is incorrect to be used for described additional check information, then the part of makeing mistakes is carried out and the corresponding decoding of described default coded system;
Error correction unit is used for the part of makeing mistakes of described additional check information is carried out error correction.
18. device as claimed in claim 17 is characterized in that, described decoding unit is the decoding of additional check information of the coded system correspondence of LDPC sign indicating number.
19. device as claimed in claim 17 is characterized in that, described decoding unit is the decoding of additional check information of the coded system correspondence of Turbo code.
20. device as claimed in claim 15 is characterized in that, also comprises:
It is synchronized video data and voice data that demultiplexing unit, described demultiplexing unit are used for described multimedia service data stream demultiplexing.
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| CN110995395A (en) * | 2019-12-04 | 2020-04-10 | 重庆邮电大学 | Channel coding method for DMB file transmission |
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| CN110995395A (en) * | 2019-12-04 | 2020-04-10 | 重庆邮电大学 | Channel coding method for DMB file transmission |
| CN110995395B (en) * | 2019-12-04 | 2022-04-12 | 重庆邮电大学 | Channel coding method for DMB file transmission |
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