CN101729169B - Method and device for transmitting and receiving multimedia data - Google Patents
Method and device for transmitting and receiving multimedia data Download PDFInfo
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- CN101729169B CN101729169B CN2008102242599A CN200810224259A CN101729169B CN 101729169 B CN101729169 B CN 101729169B CN 2008102242599 A CN2008102242599 A CN 2008102242599A CN 200810224259 A CN200810224259 A CN 200810224259A CN 101729169 B CN101729169 B CN 101729169B
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Abstract
The invention discloses a method and a device for transmitting and receiving multimedia data. The method for transmitting the multimedia data comprises the following steps of: distributing service data of various multimedia services to different data clusters for transmitting, wherein one data cluster can only bear the service data of one multimedia service; and transmitting the description information of the data clusters to indicate the data clusters for bearing each service, wherein the data clusters are a plurality of adjacent common interleaved frames. The technical scheme of the invention greatly improves the feasibility of reducing the power consumption of mobile portable receiving equipment, and has the characteristics of easy implementation, simple equipment, low improvement cost and good compatibility.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of transmission, method of reseptance and receiver and transmitter of multi-medium data.
Background technology
Ground digital audio frequency/multimedia broadcasting is an important component part of radio, film and television digitlization process; Compare with analog broadcastings such as existing frequency modulation, amplitude modulation; Digital audio broadcast system has advantages such as tonequality is good, the availability of frequency spectrum is high, can realize large-area SFN covering, high, the mobile receptivity of receiver sensitivity is good; Because its digitized innate advantage; Digital audio broadcast system can transmit diversified value added data when transmission of audio is professional professional, and digital audio broadcasting also develops into present DMB gradually.
One big advantage of digital audio/multimedia broadcast system is exactly to realize the mobile reception of high quality audio/data service; Receiver can be the multiple forms of expression such as portable terminal device, mobile phone such as vehicle-mounted, MP4, palmtop PC PDA; And to moving portable terminal device; Under existing battery production technical merit; The receiver power consumption is directly connected to the stand-by time and the operating time of receiving equipments such as portable terminal device, mobile phone, and this factor of operating time has also influenced the industrialization process of ground digital audio frequency/multi-media broadcasting system to a great extent.Therefore, research reduces the mode and the method for receiver power consumption on the prerequisite of the technical system of the existing ground digital audio frequency/multi-media broadcasting system of compatibility and basis, has very important in theory look like with reality.
At present; Also there is not the method that occurs specially data transfer mode being optimized and reduce the receiver power consumption in China's digital audio/multimedia broadcast world; There is patent to propose to utilize system's inherent characteristic of digital audio/multimedia broadcasting; Can when the system transmissions present receiving machine is selected business datum, turn-off receiver radio frequency and baseband processing module, thereby reach the purpose that reduces the receiver power consumption to a certain extent, but because this mode does not change data transmission structure in the system; Just be optimized at receiving terminal, it is limited optimizing effect.
China's radio and television are being implemented the integral body conversion from analog to digital now; The development of digital audio/multimedia broadcasting is very strong to the requirement that reduces the receiver power consumption; The power problems of portable receiving equipment has become a key factor of restriction DAB/multimedia broadcasting development, has also just also influenced the integral body conversion of radio and television to a certain extent.Thereby; Be badly in need of a kind of effective at present in China digital television broadcasting field; Easy to implement, the data transmission method of low-cost, compatible prior art system further optimizes existing ground digital audio frequency/multimedia system, for reducing the power consumption that moves portable receiving equipment possibility is provided to the full extent; Advance the industrialization process of China's ground digital audio frequency/multimedia broadcasting, thereby further promote the process of radio and television from the analog to digital conversion.
Ground digital audio frequency/multi-media broadcasting system has service integration structure flexibly; For audio frequency and data service provide a transparent transmission channel, can in the high quality audio service, transmit the data service and the real-time video traffic of various ways.
The data of ground digital audio frequency/multi-media broadcasting system emission transmission simultaneously in 1.536MHz analog radio frequency bandwidth are generically and collectively referred to as an assembly signal; Can transmit the multichannel business datum simultaneously in the assembly signal; These business datums can audio data stream, also can be the data of video or other multimedia services.It is together multiplexing that the professional data of this multichannel are passed through the specific multiplex mode of system, transmission in the MSC in system (MSC).Transmission in the snap information passage (FIC) of multiplexing structure descriptor (MCI) in system.The transmission frame-form of ground digital audio frequency/multi-media broadcasting system is as shown in Figure 1:
Ground digital audio frequency/multi-media broadcasting system system transmissions frame comprises synchronizing channel, fast information channel in dab receiver (FIC) and MSC (MSC) three parts; Each partial data all is mapped on the corresponding subcarrier in corresponding OFDM (Orthogonal Frequency Division Multiplexing, the OFDM) symbol according to transmission mode.Under different transmission modes, the OFDM symbolic number that synchronizing channel takies is fixed, and the symbolic number that fast information channel in dab receiver and MSC take and the transmission cycle of data transmission frames are different and different according to transmission mode, as shown in table 1:
The FIB (FIB) under table 1, the ground audio frequency/multimedia system different transmission mode and the quantity of public interleaving frame (CIF)
| Transmission mode | Transmission frame period | The quantity of FIB in every transmission frame | The OFDM symbolic number that fast information channel in dab receiver takies | The quantity of public interleaving frame in every transmission frame | The OFDM symbolic number that MSC takies |
| I | 96ms | 12 | 3 | 4 | 72 |
| II | |
3 | 3 | 1 | 72 |
| III | |
4 | 8 | 1 | 144 |
| IV | 48ms | 6 | 3 | 2 | 72 |
As previously mentioned, can transmit the multichannel business datum simultaneously in the MSC (MSC), the different business data are together multiplexing according to the mode of public interleaving frame (CIF), in same public interleaving frame, and the data sequence arrangement of different business; And in the same transmission frame, if there are a plurality of CIF, these several CIF sequence arrangement then.
In order to resist the sudden error code in the wireless transmission; In ground digital audio frequency/multi-media broadcasting system to the data definition that transmits among the MSC time-interleaved mode; Time-interleaved is base unit with CIF, is according to certain rule the particular piece of data among the CIF to be interweaved in the cycle with 16 CIF.Different business in the same assembly signal can have different data rates, and therefore the data volume of different business is different among the same CIF.Generally speaking, as long as professional data transmission rate satisfies certain requirement (when being the integral multiple of a certain basic data rate, this basic data rate is different and different along with transmission mode), these a plurality of business also can be mapped to respectively on the integer OFDM symbol.
Summary of the invention
The technical problem that the present invention will solve provides a kind of transmission, method of reseptance and receiver and transmitter of multi-medium data, can be used for ground digital audio frequency/multi-media broadcasting system, can create bigger space for reducing the power consumption that moves portable receiving equipment.
In order to address the above problem, the invention provides a kind of transmission method of multi-medium data, comprising:
The business datum of various multimedia services is distributed in the different aggregates of data sends, an aggregate of data only carries a kind of business datum of multimedia service; Send the aggregate of data descriptor is carried the aggregate of data of various multimedia services with indication transmission time sequence;
Said aggregate of data is adjacent a plurality of public interleaving frames, and the number of public interleaving frame is identical in each aggregate of data.
Further, each aggregate of data is 16 adjacent public interleaving frames.
Further, said aggregate of data descriptor is used snap information set type 0, and expansion type 13 is described in fast information channel in dab receiver; The aggregate of data descriptor is indicated the transmission time sequence of the aggregate of data that carries various multimedia services through the count value of the starting and ending public interleaving frame of the various multimedia services of indication.
Further, when also comprising the business datum of employing standard multiplexing structure in the assembly signal, also comprise when being distributed in the business datum of multimedia service in the aggregate of data:
In the pairing OFDM symbol of each public interleaving frame transmission cycle in this aggregate of data, the unallocated OFDM symbol of giving the business datum of employing standard multiplexing structure is distributed to the business datum of the notebook data bunch multimedia service that is carried;
The business datum that aggregate of data only carries a kind of multimedia service is meant: in the aggregate of data, distribute to the OFDM symbol of the business datum of the notebook data bunch multimedia service that is carried, all be used to transmit the business datum with a kind of multimedia service.
Further, described transmission method also comprises:
According to the aggregate of data descriptor that from fast information channel in dab receiver, receives; Confirm to be used to carry the transmission time sequence of each aggregate of data of the multimedia service that will receive; To be used to carry the aggregate of data of the multimedia service that will receive carry out demultiplexing, decoding, obtain the business datum of the multimedia service that will receive; Aggregate of data to being used to carry other multimedia services does not carry out demultiplexing and decoding.
The present invention also provides a kind of method of reseptance of multi-medium data, comprising:
According to the aggregate of data descriptor that from fast information channel in dab receiver, receives; Confirm to be used to carry the transmission time sequence of each aggregate of data of the multimedia service that will receive; To be used to carry the aggregate of data of the multimedia service that will receive carry out demultiplexing, decoding, obtain the business datum of the multimedia service that will receive; Aggregate of data to being used to carry other multimedia services does not carry out demultiplexing and decoding;
Said aggregate of data is adjacent a plurality of public interleaving frames, and the number of public interleaving frame is identical in the various aggregates of data; An aggregate of data only carries a kind of business datum of multimedia service.
Further, each aggregate of data is 16 adjacent public interleaving frames.
Further, said aggregate of data descriptor is indicated the transmission time sequence of the aggregate of data that carries various multimedia services through the count value of the starting and ending public interleaving frame of indication multimedia service; The aggregate of data descriptor is used snap information set type 0, and expansion type 13 is described in fast information channel in dab receiver;
Confirm to be used to carry the transmission time sequence of each aggregate of data of the multimedia service that will receive be meant: confirm each group be used to carry the count value of starting and ending public interleaving frame of the multimedia service that will receive; Wherein, each organizes each public interleaving frame that is transmitted between the starting and ending public interleaving frame, with the starting and ending public interleaving frame of this group form one be used to carry the aggregate of data of the multimedia service that will receive.
Further, when also comprising the business datum of employing standard multiplexing structure in the assembly signal, confirm to be used to carry also comprise behind each aggregate of data of the multimedia service that will receive:
According to the aggregate of data descriptor, said carry in each aggregate of data of the multimedia service that will receive, confirm respectively to be used to transmit the sequential of OFDM symbol of the multimedia service that will receive; Be used to transmit in said each aggregate of data of ordered pair during according to this OFDM symbol decoding of the multimedia service that will receive, the OFDM symbol that is used to transmit other multimedia service is not decoded.
Further, confirm to be used to carry the business datum of the multimedia service that aggregate of data carried before the aggregate of data transmission time sequence of the multimedia service that will receive is unified earlier receives storage;
Or confirm to be used to carry only receive behind the aggregate of data transmission time sequence of the multimedia service that will receive be used to carry the aggregate of data of the multimedia service that will receive.
The present invention also provides a kind of dispensing device of multi-medium data, comprising: Multiplexing module; And
Coding module is used for encoding to sent the business datum of multimedia service, sends to Multiplexing module behind the coding;
Interleaving block is used for the business datum of Multiplexing module output is interweaved;
Modulation module, business datum after being used for interleaving block interweaved and FIB are modulated the back and are sent;
Said Multiplexing module is used for the business datum of various multimedia services is distributed in different aggregates of data, the business datum of only distributing a kind of multimedia service to an aggregate of data; And the aggregate of data descriptor that generates the transmission time sequence be used to indicate the aggregate of data that carries various multimedia services, adopt FIB to carry;
Said aggregate of data is the plurality of adjacent public interleaving frame, and the number of public interleaving frame is identical in each aggregate of data.
Further, each aggregate of data is 16 adjacent public interleaving frames.
Further, the aggregate of data descriptor that Multiplexing module generated is used snap information set type 0, and expansion type 13 is described;
Multiplexing module passes through the count value of the starting and ending CIF frame of indication multimedia service in the aggregate of data descriptor, indicate the transmission time sequence of the aggregate of data that carries various multimedia services.
Further, when also comprising the business datum of employing standard multiplexing structure in the assembly signal:
Multiplexing module also is used in the pairing OFDM symbol of each public interleaving frame transmission cycle of this aggregate of data when being distributed in the business datum of multimedia service in the aggregate of data; The unallocated OFDM symbol of giving the business datum of employing standard multiplexing structure is distributed to the business datum of the notebook data bunch multimedia service that is carried;
Multiplexing module only distributes a kind of business datum of multimedia service to be meant to an aggregate of data: in the aggregate of data; Multiplexing module is distributed to the OFDM symbol of this aggregate of data institute loaded service, all is used to transmit the business datum with a kind of multimedia service.
The present invention also provides a kind of receiving system of multi-medium data, comprising: decoder module, radio frequency and baseband processing module and control module;
Said decoder module is used for data are carried out demultiplexing, decoding;
Said radio frequency and baseband processing module are used to receive data and with data demodulates; The data of transmitting in the fast information channel in dab receiver are sent to control module, the data of transmitting in the MSC are sent to decoder module;
Control module is used for the aggregate of data descriptor according to fast information channel in dab receiver, confirm to be used to carry the transmission time sequence of each aggregate of data of the multimedia service that will receive, to be used to carry the aggregate of data of the multimedia service that will receive start decoder module; Aggregate of data to being used to carry other multimedia services does not start decoder module;
Said aggregate of data is the plurality of adjacent public interleaving frame, and the number of public interleaving frame is identical in each aggregate of data; An aggregate of data only carries a kind of business datum of multimedia service.
Further, each aggregate of data is 16 adjacent public interleaving frames.
Further, said aggregate of data descriptor is used snap information set type 0, and expansion type 13 is at the enterprising line description of fast information channel in dab receiver; The aggregate of data descriptor is indicated the transmission time sequence of the aggregate of data that carries various multimedia services through the count value of the starting and ending public interleaving frame of indication multimedia service;
Control module confirm to be used to carry each aggregate of data of the multimedia service that will receive be meant: control module confirm each group be used to carry the count value of starting and ending public interleaving frame of the multimedia service that will receive; Each organizes each public interleaving frame that is transmitted between the starting and ending public interleaving frame, with the starting and ending public interleaving frame of this group form one be used to carry the aggregate of data of the business that will receive.
When further, also comprising the business datum of employing standard multiplexing structure in assembly signal:
Control module confirm to be used to carry behind the transmission time sequence of each aggregate of data of the multimedia service that will receive; Also be used for according to the aggregate of data descriptor; Said carry in each aggregate of data of the multimedia service that will receive, confirm to be used to transmit the multimedia service that will receive OFDM symbol sequential and send to decoder module;
Decoder module be used to transmit in said each aggregate of data of ordered pair during according to this OFDM symbol of the multimedia service that will receive decode, the OFDM symbol that transmits other multimedia service is not decoded.
Further, radio frequency and baseband processing module receive the business datum of the multimedia service of aggregate of data carrying is unified;
After perhaps control module confirm to be carried the aggregate of data transmission time sequence of the multimedia service that institute will receive, the power supply of said radio frequency of shutoff and baseband processing module in system transmissions is used to carry period of aggregate of data of other multimedia services.
The present invention is through improving ground digital audio/multimedia broadcast head end system multiplexing structure; Increase the aggregate of data descriptor of designation data bunch distribution; Realized will be on time domain the service components classification polymerization of discrete transmissions; Thereby reduced the quantity of the additional reference symbol of essential decoding, expanded greatly and realized reducing receiver power consumption space.The present invention only needs ground digital audio/multimedia broadcasting system front end multiplexing equipment and the software section that moves portable receiving equipment are changed on a small quantity, is easy to realize that improvement cost is extremely low, can compatible existing systems.
Description of drawings
Fig. 1 is the transmission frame-form of ground digital audio frequency/multi-media broadcasting system;
Fig. 2 is a traditional data bunch transmission means sketch map;
Fig. 3 is the practical implementation schematic block diagram of the dispensing device of multi-medium data of the present invention;
Fig. 4 is the practical implementation schematic block diagram of the receiving system of multi-medium data of the present invention;
Fig. 5 is among the embodiment, multi-medium data transmission means sketch map provided by the invention;
Fig. 6 (a) is among the embodiment, the user's application message transmission sketch map that provides in the ground digital audio frequency multi-media broadcasting system;
Fig. 6 (b) is among the embodiment, aggregate of data descriptor transmission means sketch map provided by the invention.
Embodiment
The proposition of technical scheme of the present invention is based on the concrete analysis of following data transmission mechanism for ground digital audio frequency/multimedia broadcasting.
In ground digital audio frequency/multi-media broadcasting system; For a plurality of business in the same assembly signal all is to carry out chnnel coding and time-interleaved respectively; But because after accomplishing system multiplexing, the position of the data in each business in same CIF fixed, and time-interleaved be to be base unit with public interleaving frame (CIF); Therefore time-interleaved also being appreciated that is interweaving in same business datum inside; Do not influence the transmission sequence of this business datum on time domain, that is after multiplexing completion, transmission time sequence and the cycle of specific transactions component data in the digital audio/multimedia broadcast system is all fixing; Can confirm through the multiplexing configuration information (MCI) of decoding Fast Channel (FIC) transmission is unique, as shown in Figure 2.
Because in the receiver practical work process; The data of actual needs decoding are the selected business of present receiving machine; Not selected business datum whether decode does not influence the normal operating conditions of receiver, so correct decoding multiplexing configuration information, confirms after the transmission time sequence of business datum; In the period of other business datums of system transmissions, turn-off the power supply of receiver radio frequency and baseband processing module, to reach the purpose that reduces the receiver power consumption.
Yet; Because the differential modulation mode that ground digital audio frequency/multi-media broadcasting system adopts; Be that a back symbol need be with previous symbol as a reference, therefore, all data of a certain specific transactions that guarantee correctly to decode; Must carry the power supply that previous symbol period is opened receiver radio frequency and baseband decoding module at least, make its operate as normal.As a rule, at a common transmission frame (CIF) transmission cycle--in-24 milliseconds, the symbolic number of transmitting the business datum of typical code check is limited; In transmission mode I; Corresponding 18 the OFDM symbols of CIF transmission cycle, and video traffic typical case code check commonly used is 384Kbps in present ground digital audio frequency/multi-media broadcasting system, audio code rate is 196K; Corresponding respectively 6 or 3 OFDM symbols; And all data of this business of correctly decoding, need decode at least 7 or 4 OFDM symbols, the power consumption overhead that reference symbol caused is up to more than 17%.
Can know that based on above analysis the reduction that only is optimized the receiver power consumption at receiver end is limited.In order to expand the leeway of theory and practice to the full extent for receiver end optimization; The present invention proposes a kind of improved, can transfer of data multiplexing structure compatible existing ground digital audio frequency/multi-media broadcasting system data transmission mechanism, that optimize; On the basis of this multiplexing structure; The corresponding transmission that proposes multi-medium data, method of reseptance and receiver and transmitter are to reduce the system overhead that reference symbol is brought to the greatest extent to greatest extent.
Improved multiplexing structure proposed by the invention can be used for ground digital audio frequency/multi-media broadcasting system; Be specially: on existing digital audio/multimedia broadcast system basis; The notion of definition " aggregate of data "; A plurality of adjacent public interleaving frames (CIF) are formed an aggregate of data, and the number of CIF of forming each aggregate of data is identical; For compatible with existing system, consider that the cycle that interweaves is 16 public interleaving frames (CIF), the scheme of therefore relatively optimizing is that 16 adjacent CIF are formed an aggregate of data, this moment, the transmission cycle of aggregate of data was 16 * 24=384 millisecond.Not getting rid of in the practical application is other number beyond 16.
In digital audio/multimedia front end system multiplexer; With the minimum unit of aggregate of data as the business data transmission distribution; That is to say; The business datum of various multimedia services is distributed in when sending in the different aggregates of data, and an aggregate of data only carries a kind of business datum of multimedia service; Single traffic transmission speed is controlled through the transmission frequency of carrying this professional aggregate of data.
Be used for the distribution of designation data bunch and the aggregate of data descriptor of multiplexed information and can use snap information set type 0; Expansion type 13 (FIG0/13) or alternate manner are described in fast information channel in dab receiver; Receiver is confirmed the aggregate of data information of the business datum of the specific multimedia service of transmission through the aggregate of data descriptor in this fast information group of decoding; The transmission time sequence of the OFDM symbol of the business datum of final definite this specific multimedia service of transmission; Thereby can control the power supply of corresponding module, finally reach the purpose that reduces the receiver power consumption.
Above-mentioned improved transfer of data multiplexing structure can be compatible fully with existing ground audio frequency/multi-media broadcasting system standard multiplex mode, can be present in simultaneously among the assembly signal.When both coexist, the OFDM symbol that the improved multiplexing structure that proposes for the present invention only distributes the multimedia service that is not used the standard multiplexing structure method of salary distribution to take.At this moment, the business datum that aggregate of data only carries a kind of multimedia service is meant, for the OFDM symbol in same aggregate of data, and the business datum of the same multimedia service of OFDM symbol transmission that the improved multiplexing structure that wherein proposes for the present invention distributes.
In the audio frequency/multi-media broadcasting system of existing ground, adopt the business description information of improved multiplexing structure transmission proposed by the invention to comprise business description information, subchannel descriptor and aggregate of data descriptor three parts in the study plot face digital audio/multimedia broadcast system; Wherein preceding two parts and standard multiplexing structure are identical, are used to guarantee the complete compatibility with existing system.
Said aggregate of data descriptor can comprise expansion frame counter (be used for identification data bunch starting and ending address), service identification and service components sign (being used for the identification service data); And the adding description informations such as count value of starting and ending CIF frame that transmit the aggregate of data of these service components data; When with the business datum that adopts the standard multiplexing structure and when depositing, also comprise initial OFDM symbol sequence number and finish OFDM symbol etc.Therefore, the recipient can be from this data description information through knowing that the aggregate of data that carries various multimedia services confirms the transmission time sequence of the business datum of certain multimedia service.
Optional; In order to guarantee the compatibility with existing ground digital audio frequency/multi-media broadcasting service to a greater extent; Can but be not limited to the multiplexing a plurality of multimedia services of improvement multiplexing structure that use the present invention to propose are regarded as the type of service of a redetermination; Store further demultiplexing decoding again after receiving further aggregate of data descriptor by unified reception of receiver.
The transmission method of multi-medium data proposed by the invention comprises:
The business datum of various multimedia services is distributed in the different aggregates of data sends, an aggregate of data only carries a kind of business datum of multimedia service; Send the aggregate of data descriptor is carried the aggregate of data of various multimedia services with indication transmission time sequence;
Said aggregate of data is adjacent a plurality of public interleaving frames, and the number of public interleaving frame is identical in each aggregate of data.
Among this paper, for convenience of description, some local use " carrying (transmission) multimedia service " is represented " carrying the business datum of (transmission) multimedia service ".
Optional, each aggregate of data can be 16 adjacent CIF; Certain like this, not getting rid of in the practical application is other number beyond 16.
Optional, said aggregate of data descriptor can but be not limited to use snap information set type 0, describe in expansion type 13 (FIG0/13) fast information channel in dab receiver; Also can make otherwise and in fast information channel in dab receiver, describe.
Optional, said aggregate of data descriptor is indicated the transmission time sequence of the aggregate of data that carries various multimedia services through the count value of the various multimedia starting and ending CIF frames of indication.
Optional, if also comprise the business datum of employing standard multiplexing structure in assembly signal, can also comprise when being distributed in the business datum of multimedia service in the aggregate of data:
In the pairing OFDM symbol of each public interleaving frame transmission cycle in this aggregate of data, the unallocated OFDM symbol of giving the business datum of employing standard multiplexing structure is distributed to the business datum of the notebook data bunch multimedia service that is carried;
At this moment; The business datum that aggregate of data only carries a kind of multimedia service can be meant: in the aggregate of data; Distribute to the OFDM symbol of the business datum of the notebook data bunch multimedia service that is carried, all be used to transmit business datum with a kind of multimedia service.
The OFDM symbol of the business datum of transmission employing standard multiplexing structure need to prove, though possibly be arranged in the CIF of some aggregate of data, the business datum of the multimedia service that they do not belong to aggregate of data is carried; " business datum of the multimedia service that aggregate of data carries " only refers to the business datum of using multiplexing structure proposed by the invention to transmit be characterized in that the business datum in an aggregate of data belongs to same multimedia service.
This transmission method can also comprise:
According to the aggregate of data descriptor that from fast information channel in dab receiver, receives; Confirm to be used to carry the transmission time sequence of each aggregate of data of the multimedia service that will receive; To be used to carry the aggregate of data of the multimedia service that will receive carry out demultiplexing, decoding, obtain the business datum of the multimedia service that will receive; Aggregate of data to being used to carry other multimedia services does not carry out demultiplexing and decoding.
The method of reseptance of multi-medium data proposed by the invention comprises:
According to the aggregate of data descriptor that from fast information channel in dab receiver, receives; Confirm to be used to carry the transmission time sequence of each aggregate of data of the multimedia service that will receive; To be used to carry the aggregate of data of the multimedia service that will receive carry out demultiplexing, decoding, obtain the business datum of the multimedia service that will receive; Aggregate of data to being used to carry other multimedia services does not carry out demultiplexing and decoding;
Said aggregate of data is adjacent a plurality of public interleaving frames, and the number of public interleaving frame is identical in the various aggregates of data; An aggregate of data only carries a kind of business datum of multimedia service.
Optional, each aggregate of data can be 16 adjacent CIF; Certainly, not getting rid of in the practical application is other number beyond 16.
Optional, said aggregate of data descriptor can but be not limited to use snap information set type 0, expansion type 13 (FIG0/13) is described in fast information channel in dab receiver, also can make otherwise and in fast information channel in dab receiver, describe.
Optional, said aggregate of data descriptor is indicated the transmission time sequence of the aggregate of data of various multimedia services through the count value of the starting and ending CIF frame of indicating services;
Confirm to be used to carry the transmission time sequence of each aggregate of data of the business that will receive be meant: confirm each group be used to carry the count value of starting and ending public interleaving frame of the multimedia service that will receive; Wherein, each organizes each public interleaving frame that is transmitted between the starting and ending public interleaving frame, with the starting and ending public interleaving frame of this group form one be used to carry the aggregate of data of the multimedia service that will receive.
Optional, if also comprise the business datum of employing standard multiplexing structure in assembly signal, then confirm to be used to carry behind each aggregate of data of the business that will receive, may further include:
According to the aggregate of data descriptor, said carry in each aggregate of data of the multimedia service that will receive, confirm respectively to be used to transmit the sequential of OFDM symbol of the multimedia service that will receive; Be used to transmit in said each aggregate of data of ordered pair during according to this OFDM symbol decoding of the multimedia service that will receive, the OFDM symbol that is used to transmit other multimedia service is not decoded.
Certainly; If the multimedia service that receives has partly adopted the transmission of standard multiplexing structure; Then except the aggregate of data that carries this multimedia service is received, also need receive by the business datum of existing method to this multimedia service of employing standard multiplexing structure.
Optional, this method of reseptance confirm to be used to carry can further include before the aggregate of data transmission time sequence of the multimedia service that will receive:---promptly to adopt the business datum of the multiplexing structure that the present invention proposes---unified earlier receives storage for the business datum of the multimedia service that aggregate of data is carried; Receive the aggregate of data descriptor and confirm to be used to carry according to the aggregate of data descriptor after each aggregate of data of the multimedia service that will receive; To be used to carry aggregate of data demultiplexing, the decoding of the multimedia service that will receive; To being used to carry the aggregate of data reception earlier of other multimedia service, not demultiplexing and decoding; Also can confirm to be used to carry only receive behind the aggregate of data transmission time sequence of the multimedia service that will receive be used to carry the aggregate of data of the business that will receive, the aggregate of data that is used to carry other multimedia service is not received.
The dispensing device of multi-medium data proposed by the invention is as shown in Figure 3, comprising: coding module, Multiplexing module, interleaving block and modulation module;
Coding module is used for encoding to sent the business datum of multimedia service, sends to Multiplexing module behind the coding;
Multiplexing module is used for the business datum of various multimedia services is distributed in different aggregates of data, the business datum of only distributing a kind of multimedia service to an aggregate of data; And the aggregate of data descriptor that generates the transmission time sequence be used to indicate the aggregate of data that carries various multimedia services, carry with FIB;
Interleaving block is used for the business datum of Multiplexing module output is interweaved;
Business datum after modulation module is used for interleaving block interweaved and FIB are modulated the back and are sent;
Said aggregate of data is the plurality of adjacent public interleaving frame, and the number of CIF is identical in each aggregate of data.
Wherein, the each several part in coding module, interleaving block and modulation module and the dispensing device except that Multiplexing module, can but be not limited to identical with existing ground digital audio frequency/multi-media broadcasting system.
Optional, each aggregate of data can be 16 adjacent CIF; Certainly, not getting rid of in the practical application is other number beyond 16.
Optional, the aggregate of data descriptor that Multiplexing module generated can but be not limited to use snap information set type 0, expansion type 13 (FIG0/13) is described in fast information channel in dab receiver, also can make otherwise and in fast information channel in dab receiver, describe.
Optional, Multiplexing module can pass through the count value of the starting and ending CIF frame of indication multimedia service in the aggregate of data descriptor that is generated, indicate the transmission time sequence of the aggregate of data that carries various multimedia services.
Optional; If also comprise the business datum of employing standard multiplexing structure in assembly signal; When being distributed in multi-medium data in the aggregate of data, Multiplexing module also is used in the pairing OFDM symbol of each public interleaving frame transmission cycle of this aggregate of data; The unallocated OFDM symbol of giving the business datum of employing standard multiplexing structure is distributed to the business datum of the notebook data bunch multimedia service that is carried;
At this moment; Multiplexing module only distributes a kind of business datum of multimedia service to be meant to an aggregate of data: in the aggregate of data; Multiplexing module is distributed to the OFDM symbol of this aggregate of data institute loaded service, all is used to transmit the business datum with a kind of multimedia service.
The receiving system of multi-medium data proposed by the invention is as shown in Figure 4, comprising:
Radio frequency and baseband processing module, control module, decoder module;
Said radio frequency and baseband processing module are used to receive data and with data demodulates; The data of transmitting among the FIC are sent to control module, the data of transmitting among the MAC are sent to decoder module;
Said control module is used for the aggregate of data descriptor according to FIC, confirm to be used to carry the transmission time sequence of each aggregate of data of the multimedia service that will receive, to be used to carry the aggregate of data of the multimedia service that will receive start decoder module; Aggregate of data to being used to carry other multimedia services does not start decoder module;
Said decoder module is used for data are carried out demultiplexing, decoding;
Said aggregate of data is the plurality of adjacent public interleaving frame, and the number of CIF is identical in each aggregate of data; An aggregate of data only carries a kind of business datum of multimedia service.
Wherein, radio frequency and baseband processing module, decoder module can but be not limited to identical with existing ground digital audio frequency/multi-media broadcasting system.
Optional, each aggregate of data can be 16 adjacent CIF; Certain like this, not getting rid of in the practical application is other number beyond 16.
Optional, said aggregate of data descriptor can but be not limited to use snap information set type 0, expansion type 13 (FIG0/13) is described in fast information channel in dab receiver, also can make otherwise and in fast information channel in dab receiver, describe.
Optional, said aggregate of data descriptor is indicated the transmission time sequence of the aggregate of data that carries various multimedia services through the count value of the starting and ending CIF frame of indication multimedia service.
Accordingly, control module confirm to be used to carry each aggregate of data of the business that will receive be meant: control module confirm each group be used to carry the count value of starting and ending public interleaving frame of the multimedia service that will receive; Each organizes each public interleaving frame that is transmitted between the starting and ending public interleaving frame, with the starting and ending public interleaving frame of this group form one be used to carry the aggregate of data of the business that will receive.
Optional; If also comprise the business datum of employing standard multiplexing structure in assembly signal; Then control module confirm to be used to carry behind the transmission time sequence of each aggregate of data of the multimedia service that will receive; Also be used for according to the aggregate of data descriptor, said carry in each aggregate of data of the multimedia service that will receive, confirm to be used to transmit the multimedia service that will receive OFDM symbol sequential and send to decoder module;
Decoder module be used to transmit in said each aggregate of data of ordered pair during according to this OFDM symbol of the multimedia service that will receive decode, the OFDM symbol that transmits other multimedia service is not decoded.
Optional, the business datum of the multimedia service that radio frequency and baseband processing module carry aggregate of data---promptly adopts the business datum of the multiplexing structure that the present invention proposes---the unified reception;
Control module confirm to carry behind the aggregate of data of the business that will receive; Also can, system transmissions turn-off the power supply of said radio frequency and baseband processing module in being used to carry period of aggregate of data of other multimedia services, further to reach the purpose that reduces the receiver power consumption; Can radio frequency and baseband processing module not controlled unified reception of business datum of the multimedia service that still aggregate of data is carried yet.
Below will combine accompanying drawing and concrete embodiment that the inventive method is further described.
This embodiment is an example with transmission mode I commonly used in the audio frequency/multi-media broadcasting system of ground; Under this transmission mode; When the QPSK QPSK mapping mode of employing standard, 1/2 rate convolutional encoder; The effective data rate that can transmit in assembly signal is 1152Kbps, can transmit the business that three same code rate (384Kbps) are arranged, under the ground of standard audio frequency/multimedia broadcasting multiplex mode; The data of three business sequence arrangement all in each CIF; As shown in Figure 5, in a transmission frame (by transmission sequence with the professional A of three business called after successively, professional B, professional C) data transfer sequence is ABCABCABCABC, and this also is the corresponding arrangement of digital audio broadcasting DAB radiofrequency signal on time domain; In order correctly to solve professional A, receiver segmentation at least solves the corresponding symbol that comprises professional A data.
At rate convolutional encoder 1/2, during the QPSK modulation system, this business takies 384000 * 2 * 0.024/64/48=6 symbol in a CIF as previously mentioned; In transmission mode I; Have 4 CIF in each transmission frame, then in 1 transmission frame, have 4 sections 24 symbols to be used for the data of transport service A, and because ground audio frequency/multi-media broadcasting system adopts differential coding; Can correctly the decode prerequisite of current sign data of receiver is the phase informations that must correctly obtain a symbol; Therefore, the business of correctly decoding, the symbolic number that receiver must at least correctly be decoded in each transmission frame is:
1 (phase reference)+3 (FIC)+4 (4 CIF) * (6+1) (there are 7 these professional symbols of transmission each CIF the inside)=32 symbols;
Therefore, need decoding 32 * 4=128 symbol (this is as far as professional B, C, and initial professional A can separate a symbol less with reference to the FIC symbol, i.e. 31 * 4=124 symbol) in four transmission frames.
If the improvement multiplex mode that designs among employing the present invention; With the aggregate of data is that least unit is distributed each professional OFDM symbol of transmission, and promptly the data of aggregate of data N-1 transport service A are as shown in Figure 2; The data of aggregate of data N transport service B; The data of aggregate of data N+1 transport service C, the average data rate of three business still keeps 384Kbps constant, and at this moment; Receiver can according to the business that will receive at times to carrying the whole aggregate of data decoding of this business; Skip other professional aggregates of data of transmission, and the aggregate of data of decoding, receiver 76 (3+1 phase reference of 72+fast information channel in dab receiver of MSC symbol the symbol) * 4=304 symbol of only need decoding.According to the DAB data allocations mode of last surface analysis, the data service of the same code check of receiver decoding, 128 * 3=384 the symbol of need decoding at least in the one-period (384 * 3=1152 millisecond).Adopt improved multiplex mode to lack 80 symbols of decoding, reduce symbolic number and be equivalent to 20.83% (80/384) of the necessary decoding symbols number standard multiplex mode under than the standard multiplex mode
The FIG type 0 that the aggregate of data descriptor defines in ground digital audio frequency/multi-media broadcasting system is described in user's application data field of transmission in the expansion type 13, transmission in fast information channel in dab receiver (FIC).Referring to Fig. 6 (a) and Fig. 6 (b).
Wherein expand frame counter and be used for the auxiliary continuous CIF frame (0-149999) of CIF counter unique identification; The CIF frame that aggregate of data initial address and aggregate of data end address represent to use the business datum of the multiplexing structure transmission that proposes among the present invention to take; Initial OFDM sequence number is represented the particular location of this business datum in the CIF frame with end OFDM sequence number, and the Rfu position is reserved as expansion in the future and uses.
More general, the situation of improvement multiplexing structure that proposes among consideration the present invention and the coexistence of standard multiplexing structure, the business of establishing (corresponding 18 OFDM symbols) employing standard multiplexing structure among the CIF accounts for N
OldIndividual, can supply to improve the symbolic number that multiplexing structure distributes is N
Avi=18-N
OldIndividual, and transmit a certain business with the standard multiplexing structure, need N in each CIF frame
StdIndividual symbol if these business are transmitted with improved multiplexing structure, utilizes and the similar derivation method in front, can draw under transmission mode I, adopts the essential decoding symbols ratio that can reduce after the improvement service integration mode that proposes among the present invention to be:
η＝2(N
avi-N
std)/N
avi(N
std+2)
Can find out from above-mentioned general formula; The efficient of the improvement multiplexing structure that the present invention proposes has bigger relation with professional code check; When professional code check was low, the symbolic number that in a CIF, takies was less, and the additional reference symbol expense that must decode is more relatively; Then adopt room for improvement of the present invention just big more, the analysis of this and front is consistent.
Further, if in ground digital audio frequency/multi-media broadcasting system, adopt the octaphase-shift keying higher sign map modes of efficient such as (8PSK), technical scheme of the present invention will have bigger advantage.
In sum, the present invention has improved greatly and has reduced the optimization space that moves portable receiving equipment power consumption through improving the transfer of data multiplexing structure of ground audio frequency/multi-media broadcasting system.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of claim of the present invention.
Claims (7)
1. the transmission method of a multi-medium data comprises:
The business datum of various multimedia services is distributed in the different aggregates of data sends, an aggregate of data only carries a kind of business datum of multimedia service; Send the aggregate of data descriptor is carried the aggregate of data of various multimedia services with indication transmission time sequence;
Said aggregate of data is adjacent a plurality of public interleaving frames, and the number of public interleaving frame is identical in each aggregate of data;
When also comprising the business datum of employing standard multiplexing structure in the assembly signal, also comprise when being distributed in the business datum of multimedia service in the aggregate of data:
In the pairing OFDM symbol of each public interleaving frame transmission cycle in this aggregate of data, the unallocated OFDM symbol of giving the business datum of employing standard multiplexing structure is distributed to the business datum of the notebook data bunch multimedia service that is carried;
The business datum that aggregate of data only carries a kind of multimedia service is meant: in the aggregate of data, distribute to the OFDM symbol of the business datum of the notebook data bunch multimedia service that is carried, all be used to transmit the business datum with a kind of multimedia service.
2. transmission method as claimed in claim 1 is characterized in that:
Each aggregate of data is 16 adjacent public interleaving frames.
3. transmission method as claimed in claim 1 is characterized in that:
Said aggregate of data descriptor is used snap information set type 0, and expansion type 13 is described in fast information channel in dab receiver; The aggregate of data descriptor is indicated the transmission time sequence of the aggregate of data that carries various multimedia services through the count value of the starting and ending public interleaving frame of the various multimedia services of indication.
4. like each described transmission method in the claim 1 to 3, it is characterized in that, also comprise:
According to the aggregate of data descriptor that from fast information channel in dab receiver, receives; Confirm to be used to carry the transmission time sequence of each aggregate of data of the multimedia service that will receive; To be used to carry the aggregate of data of the multimedia service that will receive carry out demultiplexing, decoding, obtain the business datum of the multimedia service that will receive; Aggregate of data to being used to carry other multimedia services does not carry out demultiplexing and decoding.
5. the dispensing device of a multi-medium data comprises: Multiplexing module; And
Coding module is used for encoding to sent the business datum of multimedia service, sends to Multiplexing module behind the coding;
Interleaving block is used for the business datum of Multiplexing module output is interweaved;
Modulation module, business datum after being used for interleaving block interweaved and FIB are modulated the back and are sent;
It is characterized in that:
Said Multiplexing module is used for the business datum of various multimedia services is distributed in different aggregates of data, the business datum of only distributing a kind of multimedia service to an aggregate of data; And the aggregate of data descriptor that generates the transmission time sequence be used to indicate the aggregate of data that carries various multimedia services, adopt FIB to carry;
Said aggregate of data is the plurality of adjacent public interleaving frame, and the number of public interleaving frame is identical in each aggregate of data;
When also comprising the business datum of employing standard multiplexing structure in the assembly signal:
Multiplexing module also is used in the pairing OFDM symbol of each public interleaving frame transmission cycle of this aggregate of data when being distributed in the business datum of multimedia service in the aggregate of data; The unallocated OFDM symbol of giving the business datum of employing standard multiplexing structure is distributed to the business datum of the notebook data bunch multimedia service that is carried;
Multiplexing module only distributes a kind of business datum of multimedia service to be meant to an aggregate of data: in the aggregate of data; Multiplexing module is distributed to the OFDM symbol of this aggregate of data institute loaded service, all is used to transmit the business datum with a kind of multimedia service.
6. dispensing device as claimed in claim 5 is characterized in that:
Each aggregate of data is 16 adjacent public interleaving frames.
7. dispensing device as claimed in claim 5 is characterized in that:
The aggregate of data descriptor that Multiplexing module generated is used snap information set type 0, and expansion type 13 is described;
Multiplexing module passes through the count value of the starting and ending CIF frame of indication multimedia service in the aggregate of data descriptor, indicate the transmission time sequence of the aggregate of data that carries various multimedia services.
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| CN102957942B (en) * | 2011-08-17 | 2017-07-25 | 国家新闻出版广电总局广播科学研究院 | The methods, devices and systems of data are transmitted in DMB |
| CN103532897B (en) * | 2013-04-07 | 2017-06-13 | 上海数字电视国家工程研究中心有限公司 | OFDM modulation-demo-demodulation methods and corresponding emitter, receiver |
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| CN1604646A (en) * | 2004-10-29 | 2005-04-06 | 清华大学 | Method for reducing power consumption of hand-held mobile multimedia telecasting equipment |
| CN1893328A (en) * | 2005-04-26 | 2007-01-10 | 三星电子株式会社 | Apparatus and method for transmitting and receiving broadcasting data in a digital multimedia broadcasting system |
| CN101106414A (en) * | 2006-07-10 | 2008-01-16 | 华为技术有限公司 | Method for transmitting digital signals in ground broadcasting system |
| CN101262280A (en) * | 2007-03-05 | 2008-09-10 | 中兴通讯股份有限公司 | A method for inter-frequency transmission of multicast broadcast and multicast service |
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| US7130313B2 (en) * | 2002-02-14 | 2006-10-31 | Nokia Corporation | Time-slice signaling for broadband digital broadcasting |
| CN101022440B (en) * | 2006-03-30 | 2010-12-08 | 北京新岸线移动通信技术有限公司 | Compatiable DAB ground mobile multimedia broadcast receiving and transmitting method and system |
| CN100486387C (en) * | 2007-01-23 | 2009-05-06 | 中兴通讯股份有限公司 | Electric saving method of multimedia broadcast |
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| CN1604646A (en) * | 2004-10-29 | 2005-04-06 | 清华大学 | Method for reducing power consumption of hand-held mobile multimedia telecasting equipment |
| CN1893328A (en) * | 2005-04-26 | 2007-01-10 | 三星电子株式会社 | Apparatus and method for transmitting and receiving broadcasting data in a digital multimedia broadcasting system |
| CN101106414A (en) * | 2006-07-10 | 2008-01-16 | 华为技术有限公司 | Method for transmitting digital signals in ground broadcasting system |
| CN101262280A (en) * | 2007-03-05 | 2008-09-10 | 中兴通讯股份有限公司 | A method for inter-frequency transmission of multicast broadcast and multicast service |
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