CN101557509A - Method for transmitting mobile multimedia compatible with terrestrial digital terrestrial television transmission standard - Google Patents
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Abstract
The invention relates to a method for transmitting and receiving in a mobile multimedia broadcast which is compatible with a digital television terrestrial broadcast transmission standard and belongs to the technical field of digital television information transmission. The method for transmitting comprises the steps: one-path or multipath multimedia broadcast business data is received; first processing is performed to generate a data frame, and control information is received to perform second processing so as to generate a control frame; and a superframe is formed in a time division multiplexing mode; a second frame is further formed and finally transmitted after baseband postprocessing and orthogonal upconversion are performed. The method for receiving comprises the steps: the superframe is received; the data frame and the control frame are separated; the control frame is subjected to the first processing and the data frame is subjected to the second processing. By applying the invention, when maximal compatibility with a GB20600-2006 standard is maintained, different multimedia broadcast business data can be effectively transmitted in the mobile environment.
Description
Technical field
The invention belongs to the digital television information transmission technique field, particularly a kind of mobile multimedia transmission method of compatible terrestrial DTV transmission standard.
Background technology
Mobile Multimedia Broadcasting is meant that it is the product that mobile communication and digital TV Broadcasting Techniques merge by the teleview method of service of content of portable terminal devices such as mobile phone.As a kind of new information service mode and medium form, it has brought new opportunity to develop to information industry, and existing industrial policy and control mode are proposed new change requirement.The Mobile Multimedia Broadcasting standard of comparative maturity mainly contains following 4 kinds in the industry at present:
(1) European DVB-H
Early several years ago, Europe digital video broadcasting (DVB) tissue has just been inquired into the integrated possibility of DVB-UMTS, the European DVB-T standard in early stage is in order to adapt to different requirements, be provided with variable parameter, these parameter adaptation narrow range, main still at the fixing reception of indoor and outdoor, anti-impulse disturbances is indifferent, and do not consider electricity-saving function, for portable handheld device and inapplicable.
Therefore, European DVB has organized to set up the DVB-H standard at handheld device in later stage.In 2004, DVB steering committee defines and has passed through the DVB-H standard, carries out System Verification Test in some cities just according to plan at present, such as Berlin, Germany, Helsinki and pittsburgh,U.S.A etc.
(2) S-DMB and the T-DMB of Japan, Korea S
Japan and Korea S use the T-DMB standard based on digital audio broadcasting DAB technical standard, also have satellite-based S-DMB mobile TV standard, just carry out commercial operation in Korea S at present.
(3) MediaFLO of QualCom company
QualCom has been released the proprietary MediaFLO scheme based on OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology, carries out the test of mobile TV Operation Network in the North America.
(4) based on the mobile TV of 3G technology
Improve and improve existing 3G mobile communication system.3GPP organizes the importance of having recognized broadcasting and multicast for a long time, and has paid effort for this reason, has proposed MBMS (Multimedia Broadcast/MulticastService, multimedia broadcast/multi broadcast business).MBMS comprises broadcasting and two patterns of multicast, and broadcast mode approaches digital television business, and the multicast pattern is absorbed in and be positioned group business.China Mobile, CHINAUNICOM have done correlation test and operation on GSM, cdma network, because mobile TV signal demand great amount of data transmission bandwidth, the technological means and the operation that can't become mass consumption now are professional.
More than these standards all have the deficiency of different levels, performance remains further to be improved: DVB-H inherits in DVB-T (fixing or portable receiving system), very limited at the space of mobile environment optimization on this basis, DVB-H can not provide enough power-save mechanism for receiver simultaneously, some other performance index have also been sacrificed, as increasing to 5 seconds switching time.The T-DMB availability of frequency spectrum is low, can not provide enough information throughputs to serve to satisfy the multichannel high quality multimedia, and T-DMB does not provide enough power-saving measures for receiver yet simultaneously.MediaFLO is by the independent system that proposes of high pass (QAULCOMM), does not have a compatibility, is primarily aimed at the design of 700MHz frequency at present, and promoted extension is limited.The appearance of the mobile TV MBMS standard of 3G standard also will be waited for a period of time, and mobile TV can take the great amount of data transmission bandwidth.
The China Digital TV terrestrial broadcasting standard of China's independent research, be numbered the GB20600-2006 standard, on overall performance, be better than external existing standard, in abominable broadband time-variant multipath channel, can realize the mobile multimedia transmission of high efficiency and high reliability, at present realized that the high definition TV of 24Mb/s code check moves reception, can satisfy desired efficiency of transmission of actual Mobile Multimedia Broadcasting and transmission reliability, mainly show following five aspects:
(1) system synchronization faster.
The GB20600-2006 standard relies on time domain PN sequence to carry out Domain Synchronous, is about 1ms lock in time, is equivalent to the time interval of adjacent PN sequence.And the simultaneous techniques of DVB-H realizes complexity, and be about 200ms lock in time;
(2) more accurate, channel estimating and equilibrium faster.Under the awgn channel, the channel estimating performance of GB20600-2006 standard is better than DVB-H.This is to have good related gain because the GB20600-2006 standard is used for the PN sequence of channel estimating, does not have COFDM technology distinctive interpolation error when channel estimating among the DVB-H simultaneously again.For multipath channel, the PN sequence of GB20600-2006 standard and the interference signal that multipath channel causes are to add up quadrature;
(3) better mobile receptivity.The channel estimating of GB20600-2006 standard only depends on the current sign of OFDM, and the channel estimating of DVB-H COFDM needs 4 continuous OFDM symbols.Therefore, COFDM will consider the channel variation influence of 4 OFDM symbols, and the GB20600-2006 standard only need be considered the channel variation influence of 1 OFDM symbol under situation of movement;
(4) resist transmission error code better,, have the performance of approaching Shannon limit and low encoding and decoding complexity because the GB20600-2006 standard has adopted the best low density parity check code LDPC of present performance.And DVB-H has increased the MPE-FEC module again on the basis of original DVB-T, has adopted RS (255,191), and performance is lower than the LDPC sign indicating number;
(5) efficiency of transmission or spectrum efficiency height.Because the GB20600-2006 standard does not adopt the pilot signal of COFDM technology among the European DVB-H, can improve the efficiency of transmission about 10%.
For hand-held mobile multimedia receiving equipment, power consumption is another key factor, how to reduce the power consumption of handheld device, and increasing battery service time is the problem that Mobile Multimedia Broadcasting must solve.GB20600-2006 standard frame and natural time are synchronous, and each signal frame all has unique identifier, utilize these characteristics to help designing more excellent portable equipment power-saving control.GB20600-2006 system synchronization time while is fast, can adopt the time-division multiplex technology in crack more in short-term, makes circuit enter park mode more, reaches better power saving effect.
In view of this, use for making a kind of like this standard obtain higher generalization, further its market economy orderly development of standard is an aim, the invention provides and send in the Mobile Multimedia Broadcasting of this Digital Television Terrestrial Broadcasting of a kind of compatibility GB20600-2006 standard and the transmission method that receives, can be in mobile environment the efficient transmission of multimedia broadcast service data.
Summary of the invention
The technical issues that need to address of the present invention are, in known technology, external known Mobile Multimedia Broadcasting standard exists the weak point of different levels, the Digital TV broadcasting standard for terrestrial of China's independent research, have superiority such as high efficiency high reliability and energy savings consumption, in order to solve and to promote applying and further expansion of this standard, just need develop the corresponding techniques method that this standard is achieved that is beneficial to, help the popularization of standard, the purpose of this invention is to provide the transmission method that sends and receive in a kind of Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard, for realizing purpose of the present invention, the technical scheme that is adopted is: send in a kind of Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard and the transmission method that receives, it is characterized in that: A. operates according to following steps for the transmission transmission method of Mobile Multimedia Broadcasting:
Aa. receive one or more multimedia broadcast business data;
Ab. described business datum is carried out first and handle the generation Frame; First processing comprises first chnnel coding and first modulation, and wherein first chnnel coding is used 0.4 code check, 0.6 code check or 0.8 code rate LDPC code; First Channel Modulation adopts n-QAM modulation, i.e. 4QAM, 16QAM, 32QAM and 64QAM; Preferably, every road business datum is used identical channel coding method and channel modulation mode, and independently carries out time-interleavedly, and the different business data can adopt different channel coding methods and channel modulation mode;
Ac. receiving control information;
Ad. described control information is carried out second and handle the generation control frame, second processing comprises the second channel coding and second modulation, wherein the second channel coding is fixed and is used 0.4 code rate LDPC code, and control frame is without time-interleaved simultaneously, and second channel is modulated fixing employing 4QAM modulation.Control frame comprise with business configuration, channel demodulation and decoding at least one relevant information, bag by at least one 188 byte is formed, and preferably, control frame adopts the bag of two 188 bytes, the bag of this 188 byte is the MPEG2 bag simultaneously, and the PID of its MPEG2 bag is a fixed value;
Ae. above-mentioned Frame and control frame are formed superframe in time-multiplexed mode,, preferably, first signal frame of this superframe (frame 0) is a control frame, other signal frame is the Frame that each road business datum generates in the superframe;
Af. use above-mentioned superframe to form a second frame, each second frame comprise that 8 length are 125 milliseconds superframe, its length is accurate 1 second, and Absolute Time Synchronization.This second, frame further can constitute the branch frame, and the branch frame constitutes a day frame, and a day frame is the cycle with the consecutive days, with Absolute Time Synchronization;
Ag. above-mentioned superframe is carried out launching behind baseband postprocessing and the quadrature up-conversion;
B. to the reception transmission method of Mobile Multimedia Broadcasting, operate according to following steps:
Ba. receive superframe, wherein said superframe comprises control frame and at least one Frame;
Bb. separate described control frame and described Frame;
Bc. described control frame being carried out first handles;
Bd. described Frame is carried out second and handle, wherein said first handles and comprises first channel demodulation and first decoding, and second handles and comprise that second channel is separated and be in harmonious proportion second decoding
Be. one or more multimedia broadcast business data.
During first of described receiving terminal is handled described first separated and is in harmonious proportion first decoding and second second in handling and separates and be in harmonious proportion second decoding, first separates and is in harmonious proportion first decoding and second second in handling and separates that to be in harmonious proportion second decoding corresponding with first of transmitting terminal is handled respectively.
Receiving terminal can selectively be handled each road business datum according to receiving the control information that control frame comprises.Utilize the service configuration information in the control information on the one hand, the control superframe receives, and receives required Frame selectively; Utilize channel demodulation and decoded information in the control information on the other hand, first processing procedure of control data frame.
Control frame comprise with business configuration, channel demodulation and decoding at least one relevant information.
Per 8 a superframes formation frame second; This second, the length of frame accurately was 1 second, with Absolute Time Synchronization.
This second, frame further constituted the branch frame, and the branch frame constitutes a day frame, and a day frame is the cycle with the consecutive days, with Absolute Time Synchronization.
Described control frame is first signal frame of superframe.
Utilize the n-QAM modulation technique that control frame is modulated, n can get 4 or other values.
Utilize the LDPC coding, specifically control frame is encoded with the LDPC coding of 0.4 code check.
Described control frame is without time-interleaved, and this control frame comprises the bag of at least one 188 byte.
The bag of described 188 bytes is the MPEG2 bag; The PID of described MPEG2 bag is a fixed value.
Adopt n-QAM that Frame is modulated, be specially 4QAM, 16QAM, 32QAM, 64QAM, 128QAM or 256QAM Frame is modulated.
Described Mobile Multimedia Broadcasting transmission method is used to transmit the multimedia broadcast data that comprises voice data, text, video data.
The invention has the beneficial effects as follows: the transmission method that sends in the Mobile Multimedia Broadcasting proposed by the invention, receives is in maintenance and the maximum compatibility of GB20600-2006 standard, can in mobile environment, effectively transmit multiple multimedia broadcast business data, effectively support applying and further expansion of respective transmissions standard.
Description of drawings
Second frame and the control frame Hierarchichal frame structure of Fig. 1 the present invention expansion;
The frame structure of Fig. 2 the present invention definition;
The superframe structure of Fig. 3 the present invention definition;
The flow chart of steps of Fig. 4 a transmission method transmitting terminal of the present invention;
Receiving terminal flow chart of steps in Fig. 4 b transmission method of the present invention;
Control frame second processing procedure that Fig. 5 embodiment uses;
Frame first processing procedure that Fig. 6 embodiment 1 uses;
Frame first processing procedure that Fig. 7 embodiment 2 uses;
The byte interleaver device structure chart that Fig. 8 embodiment 2 Frames use;
Frame first processing procedure that Fig. 9 embodiment 3 uses;
The time-interleaved structure chart that Figure 10 embodiment 3 Frames use.
Embodiment
The present invention can provide the multimedia programming that comprises high-quality digital audio broadcasting, digital video broadcasting.
The present invention is based on China Digital TV terrestrial broadcasting transmission standard (GB20600-2006), make full use of this one deck of signal frame in the GB20600-2006 standard frame, defined a kind of frame structure, chnnel coding and modulation technique of Mobile Multimedia Broadcasting transmission signals.The present invention has kept the maximum compatibility with China's Digital Television Terrestrial Broadcasting transmission standard.Terrestrial DTV program and mobile phone/mobile multi-media broadcast program can be distinguished separately and to broadcast or both mix broadcasts in same channel in actual applications, are fit to operation of single transmit machine and large-scale single frequency network application.
The Mobile Multimedia Broadcasting transmission method of the present invention's definition is supported multiple frequency network, MFN and two kinds of networking models of single frequency network, support fixing, the walking and the vehicle-mounted mobile reception of chamber inside/outside, can select different transmission mode and parameter with network environment according to the characteristic of applied business, and support multiple services mixed mode, reach the coupling of traffic performance and transmission mode, realize the flexibility and the economy of service operation.
With reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
With reference to Fig. 1-3, in China Digital TV terrestrial broadcasting transmission standard GB20600-2006, division of signal is the multi-frame structure of layering, and the most basic unit is a signal frame.A signal frame is made of at interval frame and protection.The protection gap length is 1/9 (being called the PN420 pattern) or 1/4 (being called the PN945 pattern) of frame length.Frame is made up of 3744 symbol and 36 symbols that carry transmission parameter signaling that carry data.The information that transmission parameter signaling carries is used for the transmission code stream that demodulator adapts to input automatically, for example forward error correction ISN code check, time-interleaved length and modulation system etc.On signal frame, be followed successively by from lower to upper: superframe, branch frame and day frame.In order to support Mobile Multimedia Broadcasting to receive, the present invention has introduced the definition of control frame and second frame, as shown in Figure 1.Per 8 superframes be defined as one second frame, each second the length of frame accurately be 1 second, and Absolute Time Synchronization.First signal frame of each superframe (frame 0) is defined as control frame (being called first frame in the GB20600-2006 standard), and other signal frame is defined as Frame, as shown in Figure 2.For PN420, each superframe is made up of 225 signal frames, and Frame has 224, i.e. J=224; For PN945, each superframe is made up of 200 signal frames, and Frame has 199, i.e. J=199.
The major function of control frame is that carrying is used for the necessary control information of business configuration, channel demodulation and decoding, and Frame is used for the transmission of each road mobile multi-media service data.For the ease of service management, every circuit-switched data business takies the integer number of data frame and transmits in each superframe, and simultaneously each business is to be that unit distributes with 4 or 8 signal frames in the frame in second.Every like this road business is necessary for 4 or 8 multiple at a signal frame number that second, frame took, and the signal frame number that promptly uses is 4n or 8n, and wherein n is 〉=1 integer.After the business datum input of a low code check, be divided into many bursts according to size, be distributed in the Frame of different superframes, remainder is other business datum, constitutes a complete signal that meets frame structure of the present invention at last.As shown in Figure 3.
After obtaining Frame and control frame according to said method, it is embedded in the GB20600-2006 standard superframe in time-multiplexed mode.Wherein first signal frame of superframe (frame 0 is called first frame in GB20600-2006) embeds control frame, and other signal frame embeds Frame.
Then use an above-mentioned superframe structure second frame, each second frame comprise that 8 length are 125 milliseconds superframe, its length accurately was 1 second, and and Absolute Time Synchronization.This second, frame further can constitute the branch frame, and the branch frame constitutes a day frame, and a day frame is the cycle with the consecutive days, with Absolute Time Synchronization.
At last above-mentioned superframe is carried out launching behind the baseband postprocessing of GB20600-2006 standard definition and the quadrature up-conversion.
With reference to Fig. 4 a, provided transmitting terminal flow chart of steps in the transmission method of the present invention.Wherein business datum is handled through first and is generated Frame; Control information is handled through second and is generated control frame.Described first processing comprises first chnnel coding and first modulation, second handles and to comprise the second channel modulation and second coding, and described first in handling described first modulation and in first coding at least one is different from that second described second in the handling modulated and second encode.Providing first at this handles and second 3 embodiment that handle.
With reference to Fig. 4 b, represent the flow chart of steps of receiving terminal in the transmission method of the present invention, at receiving terminal, the superframe of reception comprises control frame and at least one Frame, isolates control frame and Frame according to this superframe.Isolated control frame is carried out second handle, this second is handled and comprises that second channel is separated and be in harmonious proportion second decoding, separates with second during second of transmission ends is handled that to be in harmonious proportion second decoding corresponding.Control frame is handled the controlled information in back through second, control information comprise with business configuration, channel demodulation and decoding at least one relevant information.Utilize the service configuration information in the control information, can control superframe and receive, receive required Frame selectively; Utilize channel demodulation and decoded information in the control information, can the control data frame first handle, indication first is handled and is carried out correct first and separate and be in harmonious proportion first decoding.Frame obtains one or more multimedia broadcast business data after handling through first.
With reference to Fig. 5-Fig. 7, second processing procedure of wherein representing control frame as shown in Figure 5.The fixing 4QAM of employing of second channel modulation modulates, fixing 0.4 code rate LDPC code that uses of second coding, and control frame is without time-interleaved simultaneously.Control frame is made up of the bag of at least one 188 byte, and the form of the bag of this 188 byte can be determined according to specifically being used for by the user.Adopt the bag of two 188 bytes in this enforcement, the bag of this 188 byte is the MPEG2 bag simultaneously, and the PID of its MPEG2 bag is a fixed value.
The second randomization module of handling uses scrambler to carry out scrambling to two MPEG2 packets of input.Scrambler is a maximum length binary pseudo-random sequence.The linear feedback shift register of this sequence generates.Its generator polynomial is defined as:
G(x)＝1+x14+x15
The detailed description of randomization module sees also China Digital TV terrestrial broadcasting transmission standard GB20600-2006.
Bit stream behind the scrambler then carries out the LDPC coding.The GB20600-2006 standard definition LDPC coding of 3 code checks, its concrete parameter sees Table 1.
| Numbering | Block length [bit] | Information bit | Corresponding codes |
| Code check | |||
| 1 | 7488 | 3008 | 0.4 |
| |
7488 | 4512 | 0.6 |
| |
7488 | 6016 | 0.8 |
Table 1LDPC code parameters
When control frame is carried out the LDPC coding, the fixing code check 1 that uses, the i.e. LDPC of 0.4 code check coding.
The bit stream that coding produces then converts uniform nQAM (n: number of constellation points) symbols streams to.The GB20600-2006 standard comprises following several sign map relation: 64QAM, 32QAM, 16QAM, 4QAM.When control frame was shone upon, the fixing 4QAM of use shone upon.
After mapping, control frame is that data length is 3744 4QAM symbols, without interweaving, directly be combined into the frame data by Multiplexing module with 36 system information symbol, its multiplexing structure is: 36 system information symbol are arranged in preceding 36 character positions of frame data continuously.
Further above-mentioned frame and frame head symbol are combined into signal frame by the framing module, its framing structure is: before the frame head symbol is arranged in the frame data continuously.
The signal frame of Sheng Chenging has comprised the control information of the MPEG2 bag of two 188 bytes like this, is control frame.System information, Multiplexing module and framing module describe in detail and see also China Digital TV terrestrial broadcasting transmission standard GB20600-2006.
First processing procedure of Frame as shown in Figure 6 among the embodiment 1.The same time domain of also not carrying out with control frame of Frame interweaves in embodiment 1, but it is different with control frame, the Frame of different business data flexible configuration is different according to actual needs channel coding method and channel modulation mode, its first coding uses 0.4 code check, 0.6 code check or 0.8 code rate LDPC code, first Channel Modulation adopts n-QAM modulation, i.e. 4QAM, 16QAM, 32QAM or 64QAM simultaneously.
Identical among control frame second processing procedure that expression is used in another embodiment 2 and the preceding embodiment 1.
In order further to reduce threshold level, in handling, Frame first added a RS coding and byte-interleaved again.Wherein RS is encoded to RS (188, K), K is the byte number of information sequence in each RS code word, and the check word joint number is (188-K), and K can get K=188, K=164 and K=140.This RS coding be by original RS (255, K+67) RS that produces after by brachymemma of systematic code (188, K).Wherein K is the byte number of information sequence in each RS code word, and the check word joint number is (188-K), and K can get K=188, K=164 and K=140.Original RS (255, K+67) each code element of systematic code is taken from territory GF (256), and the generator polynomial in this territory is:
p(x)＝x8+x4+x3+x2+1
(188, sign indicating number generator polynomial K) is defined as RS
Its concrete coefficient g
iSee Table 2-table 4 respectively.
| Sequence | gi | |
| 0 | 1 |
Table 2RS (188,188) generator polynomial coefficient
| Sequence number i | gi | Sequence number i | gi | Sequence number i | gi | Sequence | gi | |
| 0 | 193 | 7 | 133 | 14 | 174 | 21 | 33 | |
| 1 | 108 | 8 | 251 | 15 | 252 | 22 | 197 | |
| 2 | 199 | 9 | 125 | 16 | 218 | 23 | 244 | |
| 3 | 208 | 10 | 44 | 17 | 8 | 24 | 1 | |
| 4 | 173 | 11 | 167 | 18 | 197 | |||
| 5 | 79 | 12 | 198 | 19 | 195 | |||
| 6 | 45 | 13 | 150 | 20 | 20 |
Table 3RS (188,164) generator polynomial coefficient
| Sequence number i | gi | Sequence number i | gi | Sequence number i | gi | Sequence | gi | |
| 0 | 228 | 13 | 12 | 26 | 109 | 39 | 32 | |
| 1 | 231 | 14 | 160 | 27 | 176 | 40 | 157 | |
| 2 | 214 | 15 | 151 | 28 | 148 | 41 | 194 | |
| 3 | 81 | 16 | 195 | 29 | 218 | 42 | 73 | |
| 4 | 113 | 17 | 170 | 30 | 21 | 43 | 195 | |
| 5 | 204 | 18 | 150 | 31 | 161 | 44 | 218 | |
| 6 | 19 | 19 | 151 | 32 | 240 | 45 | 14 | |
| 7 | 169 | 20 | 251 | 33 | 25 | 46 | 12 | |
| 8 | 10 | 21 | 218 | 34 | 15 | 47 | 122 | |
| 9 | 244 | 22 | 245 | 35 | 71 | 48 | 1 | |
| 10 | 117 | 23 | 166 | 36 | 62 | |||
| 11 | 219 | 24 | 149 | 37 | 5 | |||
| 12 | 130 | 25 | 183 | 38 | 17 |
Table 4RS (188,140) generator polynomial coefficient
With reference to Fig. 8, the byte interleaver device structure chart that the expression Frame uses in order to reduce the ISN error correction to the continuous error code influence that outside RS sign indicating number produces, has inserted byte interleaver device behind the RS coding.Byte interleaver device is to be the block interleaving of unit with byte (8 bits), and every byte data writes by row, reads by row.The degree of depth of block interleaving is for fixing 188, like this each row just in time write a RS (188, K) code word.Weaving width is represented that by variable Bw in order to adapt to different constellation mapping and LDPC coding, Bw can select flexibly, and maximum is 216.
In order to reduce byte-interleaved time-delay, generally select suitable Bw, make the RS coded data of each business in a second frame just in time take the storage size (188 * Bw byte) that the integral words joint interweaves.
Identical among control frame second processing procedure in the 3rd embodiment 3 and the embodiment 1, continue as shown in Figure 5.
With reference to Fig. 9, in handling, Frame first added the time domain option that interweaves again.The Frame of different business data flexible configuration is different according to actual needs channel coding method and channel modulation mode, and independently carry out time-interleaved.
With reference to Figure 10, the time-interleaved structure chart that the expression Frame uses has added the convolution symbol interleaving as time-interleaved among the China Digital TV terrestrial broadcasting transmission standard GB20600-2006.In order to adapt to mobile multi-media service, the present invention has expanded a kind of time-interleaved option based on block interleaving.The time-interleaved device of expansion is to be the block interleaving of unit with the constellation symbol, writes by row, reads by row.The interleave depth of block interleaving and weaving width represented by variable Tw and Td respectively, and wherein interleave depth Tw is for fixing 312, and weaving width Td can adapt to different constellation mapping and the LDPC coding is selected flexibly, and maximum is 384.
In order to reduce time-interleaved time-delay, generally select suitable Td, make that each business transmission symbol number in the second frame is the storage size (Td * 416 symbol) of an integer symbol interleaving.So time-interleaved option with second frame be that unit carries out, each second first data symbol the 1st row and the 1st of writing the symbol interleaving memory block of frame be listed as.Because every road business is that unit distributes with 4 or 8 signal frames in the second frame, the signal frame number that promptly every road business was used in the frame in second is 4n or 8n, the wherein integer of n 〉=1.Getting under the situation of 8n, because the symbolic number of each signal frame is 3744, so the symbolic number that each business was used in the frame in second is 3744 * 8n=312 * 96n.According to different n, can calculate the value of corresponding Td:
When generating Frame, and use expansion time to interweave independently to interweave for every road business datum.No matter Frame uses which kind of chnnel coding and Channel Modulation pattern, and control frame all adopts fixing 4QAM modulation, 0.4 code check LDPC, no time-interleaved.Wherein adopt no time-interleavedly can guarantee that control information transmits safely and fast, adopt the LDPC coding of 0.4 code check and QPSK to modulate and then can effectively prevent transmission error code.Each control frame is made up of the MPEG2 bag of 2 188 bytes, and its PID is fixed as 0x0017.MPEG2 comprises the control information that will transmit.
The present invention is not limited to above-mentioned specific embodiment.
Claims (10)
1. send in the Mobile Multimedia Broadcasting of a compatible with digital television terrestrial broadcasting transmission standard and the transmission method that receives, it is characterized in that: A. operates according to following steps for the transmission method that sends in the Mobile Multimedia Broadcasting:
Aa. receive one or more multimedia broadcast business data;
Ab. described business datum is carried out first and handle the generation Frame;
Ac. receiving control information;
Ad. described control information is carried out second and handle the generation control frame;
Ae. above-mentioned Frame and control frame are formed superframe in time-multiplexed mode;
Af. use above-mentioned superframe to form a second frame;
Ag. above-mentioned superframe is carried out launching behind baseband postprocessing and the quadrature up-conversion;
B. the transmission method to receiving in the Mobile Multimedia Broadcasting, operate according to following steps:
Ba. receive superframe, wherein said superframe comprises control frame and at least one Frame;
Bb. separate described control frame and described Frame;
Bc. described control frame is carried out first and handle, comprise first channel demodulation and first decoding;
Bd. described Frame is carried out second and handle, comprise that second channel is separated to be in harmonious proportion second decoding;
Be. one or more multimedia broadcast business data.
2. send in the Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard as claimed in claim 1 and the transmission method that receives, it is characterized in that: control frame comprise with business configuration, channel demodulation and decoding at least one relevant information.
3. send in the Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard as claimed in claim 1 and the transmission method that receives, it is characterized in that: per 8 a superframes formation frame second; This second, the length of frame accurately was 1 second, with Absolute Time Synchronization.
4. as sending in the Mobile Multimedia Broadcasting of claim 1 or 3 described compatible with digital television terrestrial broadcasting transmission standards and the transmission method that receives, it is characterized in that: this second frame further constitute the branch frame, divide frame to constitute a day frame, a day frame is the cycle with the consecutive days, with Absolute Time Synchronization.
5. send in the Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard as claimed in claim 1 or 2 and the transmission method that receives, it is characterized in that: described control frame is first signal frame of superframe.
6. send in the Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard as claimed in claim 1 or 2 and the transmission method that receives, it is characterized in that: utilize the n-QAM modulation technique that control frame is modulated, n can get 4 or other values.
7. send in the Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard as claimed in claim 1 or 2 and the transmission method that receives, it is characterized in that: utilize the LDPC coding, specifically control frame is encoded with the LDPC coding of 0.4 code check.
8. send in the Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard as claimed in claim 1 or 2 and the transmission method that receives, it is characterized in that: described control frame is without time-interleaved, and this control frame comprises the bag of at least one 188 byte.
9. send in the Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard as claimed in claim 8 and the transmission method that receives, it is characterized in that: the bag of described 188 bytes is the MPEG2 bag; The PID of described MPEG2 bag is a fixed value.
10. send in the Mobile Multimedia Broadcasting of compatible with digital television terrestrial broadcasting transmission standard as claimed in claim 1 and the transmission method that receives, it is characterized in that: adopt n-QAM that Frame is modulated, be specially 4QAM, 16QAM, 32QAM, 64QAM, 128QAM or 256QAM Frame is modulated.
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|---|---|---|---|
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| CN104283635A (en) * | 2013-07-11 | 2015-01-14 | 电信科学技术研究院 | Data transmission method and equipment |
| CN105207742A (en) * | 2009-11-17 | 2015-12-30 | 索尼公司 | Transmitter and transmission method for broadcasting data in a broadcasting system providing incremental redundancy |
| CN105681819A (en) * | 2014-11-18 | 2016-06-15 | 中兴通讯股份有限公司 | Method, device and system for sending and receiving signal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100576543B1 (en) * | 2003-08-26 | 2006-05-03 | 한국전자통신연구원 | Apparatus and Method for Converting Media Stream for Multimedia Service in DAB system |
| KR100753540B1 (en) * | 2005-01-20 | 2007-08-30 | 주식회사 에스비에스 | The method of visual radio broadcasting, the encoder for it and the receiver including the encoder |
| CN101031075A (en) * | 2006-03-02 | 2007-09-05 | 华为技术有限公司 | System and method for mobile video broadcasting |
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| CN105207742A (en) * | 2009-11-17 | 2015-12-30 | 索尼公司 | Transmitter and transmission method for broadcasting data in a broadcasting system providing incremental redundancy |
| US10250358B2 (en) | 2009-11-17 | 2019-04-02 | Saturn Licensing Llc | Transmitter and receiver for transmitting basic codeword portion and auxiliary codeword portion of a codeword in different frames |
| CN105207742B (en) * | 2009-11-17 | 2019-04-23 | 索尼公司 | The transmitter and receiver of broadcast data in the broadcast system that steadily increase redundancy is provided |
| CN104283635A (en) * | 2013-07-11 | 2015-01-14 | 电信科学技术研究院 | Data transmission method and equipment |
| CN104283635B (en) * | 2013-07-11 | 2018-04-24 | 大唐电信科技产业控股有限公司 | A kind of data transmission method and equipment |
| CN105681819A (en) * | 2014-11-18 | 2016-06-15 | 中兴通讯股份有限公司 | Method, device and system for sending and receiving signal |
| CN105681819B (en) * | 2014-11-18 | 2020-01-07 | 中兴通讯股份有限公司 | Method, device and system for transmitting and receiving signals |
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| CN101557509B (en) | 2011-02-16 |
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