WO2019047733A1 - Dispositif d'envoi et dispositif de réception de signaux multimédias numériques, et procédés associés - Google Patents

Dispositif d'envoi et dispositif de réception de signaux multimédias numériques, et procédés associés Download PDF

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WO2019047733A1
WO2019047733A1 PCT/CN2018/102338 CN2018102338W WO2019047733A1 WO 2019047733 A1 WO2019047733 A1 WO 2019047733A1 CN 2018102338 W CN2018102338 W CN 2018102338W WO 2019047733 A1 WO2019047733 A1 WO 2019047733A1
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physical
data
pipeline
frame
signaling
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PCT/CN2018/102338
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English (en)
Chinese (zh)
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雷文
邢观斌
王伟平
陶涛
申红兵
李群
邱翔东
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国广融合（北京）传媒科技发展有限公司
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Publication of WO2019047733A1 publication Critical patent/WO2019047733A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting

Definitions

  • the present invention relates to the field of digital broadcasting technologies, and more particularly to a digital multimedia signal transmitting method in a digital broadcasting system, a digital multimedia signal receiving method in a digital broadcasting system, a digital multimedia signal transmitting device in a digital broadcasting system, and a digital broadcasting system Digital multimedia signal receiving device.
  • An object of the present invention is to provide a digital multimedia signal transmission and reception scheme to realize multi-transport channel cooperation and meet multi-service requirements.
  • a digital multimedia signal transmitting method in a digital broadcasting system comprising the steps of:
  • the transmitting end converts the service data from the upper layer into a physical data pipeline bit stream, performs scrambling; performs BCH encoding on the scrambled physical data pipeline bit stream; and performs LDPC encoding on the BCH encoded physical data pipeline bit stream;
  • the LDPC encoded physical data pipeline bit stream performs block bit interleaving; inter-frame interleaving of the physical data pipeline bit stream after block bit interleaving; constellation mapping of the physical data pipeline bit stream after inter-frame interleaving;
  • the physical data pipeline bit stream is hierarchically multiplexed to form a physical data pipeline data symbol;
  • the transmitting end converts the signaling data from the upper layer into a physical signaling pipeline bit stream, performs scrambling code, performs LDPC encoding on the physical signaling pipeline bit stream after the scrambling code, and performs LDPC encoded physical signaling pipeline bit stream.
  • Constellation mapping which constitutes a physical signaling pipeline data symbol
  • the transmitting end converts the fast service data from the upper layer into a physical fast pipeline bit stream, performs scrambling code, performs LDPC encoding on the scrambled physical fast pipeline bit stream, and performs constellation mapping on the LDPC encoded physical fast pipeline bit stream. Forming physical fast pipeline data symbols;
  • the transmitting end converts the service data from the upper layer into a physical tail pipe bit stream, performs scrambling; performs BCH encoding on the physical tail pipe bit stream after the scrambling code; performs LDPC encoding on the BCH encoded physical tail pipe bit stream;
  • the LDPC-encoded physical tail pipe bit stream performs block bit interleaving; the block-bit interleaved physical tail pipe bit stream is constellated to form a physical tail pipe data symbol;
  • the preamble signal, the intra pilot symbol, the data symbol on the frame header data block, and the data symbol on the frame body data block are multiplexed together to form a physical signal frame;
  • the physical signal frame is transformed from baseband to radio frequency for transmission.
  • a digital multimedia signal receiving method in a digital broadcasting system comprising the steps of:
  • Extracting service data carried by the physical tail pipe by performing constellation mapping, deblocking bit interleaving, LDPC decoding, BCH decoding, and descrambling code;
  • the signaling data, the fast service data, and the service data are sent to the upper layer.
  • a digital multimedia signal transmitting apparatus in a digital broadcasting system includes a memory, a processor, and a computer program stored on the memory and operable on the processor, the processor executing the The digital multimedia signal transmitting method in the aforementioned digital broadcasting system is implemented when the program is described.
  • a digital multimedia signal receiving apparatus in a digital broadcasting system includes a memory, a processor, and a computer program stored on the memory and operable on the processor, the processor executing the The digital multimedia signal receiving method in the aforementioned digital broadcasting system is implemented when the program is described.
  • the digital multimedia signal transmitting and receiving method and device in the digital broadcasting system provided by the invention can realize a service working in multiple different transmission channels and a plurality of data transmission pipelines in one transmission channel to meet different requirements of various services. .
  • FIG. 1 is a block diagram showing an example of a hardware configuration of a digital multimedia signal transmitting apparatus or a digital multimedia signal receiving apparatus that can be used to implement an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a physical signal frame according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a method for transmitting a digital multimedia signal in a digital broadcasting system according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a scrambling code sequence generator according to an embodiment of the present invention.
  • FIG. 5(a) is a schematic diagram of a write processing manner of block bit interleaving of a physical data pipe according to an embodiment of the present invention.
  • FIG. 5(b) is a schematic diagram of a read processing manner of block bit interleaving of a physical data pipe according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of inter-frame interleaving according to an embodiment of the present invention.
  • Fig. 7 shows the structure of the interleaver of Fig. 6.
  • Figure 8(a) is a diagram showing the first type of output processing of inter-frame interleaving provided by the real-time example of the present invention.
  • FIG. 8(b) is a schematic diagram showing a second output processing manner of inter-frame interleaving provided by the real-time example of the present invention.
  • FIG. 9 is a schematic diagram of QPSK modulation according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of 8PSK modulation provided by an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of 16APSK modulation according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram of 32APSK modulation according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of hierarchical multiplexing provided by an embodiment of the present invention.
  • FIG. 14(a) is a schematic diagram of a write processing manner of intra-frame interleaving according to an embodiment of the present invention.
  • FIG. 14(b) is a schematic diagram of a read processing manner of intraframe interleaving according to an embodiment of the present invention.
  • FIG. 15 is a schematic structural diagram of a physical signal frame according to an embodiment of the present invention.
  • FIG. 16 is a schematic diagram of a preamble signal according to an embodiment of the present invention.
  • FIG. 17 is a schematic diagram of pilot symbols provided by an embodiment of the present invention.
  • FIG. 18 is a block diagram of a CRC shift register according to an embodiment of the present invention.
  • the digital multimedia signal transmitting/receiving method and apparatus provided by the embodiments of the present invention are applicable to a single carrier digital broadcasting system.
  • FIG. 1 is a block diagram showing an example of a hardware configuration of a digital multimedia signal transmitting apparatus that can be used to implement an embodiment of the present invention.
  • the digital multimedia signal transmitting apparatus 1000 may be an electronic device such as a computer or a server. As shown in FIG. 1, the digital multimedia signal transmitting apparatus 1000 may include a processor 1010, a memory 1020, an interface device 1030, a communication device 1040, a display device 1050, an input device 1060, a speaker 1070, a microphone 1080, and the like.
  • the processor 1010 may be a central processing unit CPU, a microprocessor MCU, or the like.
  • the memory 1020 includes, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), a nonvolatile memory such as a hard disk, and the like.
  • the interface device 1030 includes, for example, a USB interface, a headphone interface, a Bluetooth interface, and the like.
  • the communication device 1040 can, for example, perform wired or wireless communication.
  • the display device 1050 is, for example, a liquid crystal display, a touch display, or the like.
  • Input device 1060 can include, for example, a touch screen, a keyboard, and the like. The user can output/input voice information through the speaker 1070 and the microphone 1080.
  • the digital multimedia signal transmitting apparatus 1000 shown in FIG. 1 is merely illustrative and is in no way intended to limit the invention, its application or use.
  • the memory 1020 of the digital multimedia signal transmitting apparatus 1000 is configured to store a computer program, and the digital multimedia signal transmitting method of any one of the embodiments of the present invention is implemented when the processor 1010 executes the program. .
  • the digital multimedia signal receiving apparatus of the embodiment of the present invention may have a hardware configuration similar to that of the digital multimedia signal transmitting apparatus.
  • the memory of the digital multimedia signal receiving device is configured to store a computer program, and the processor of the digital multimedia signal receiving device executes the program to implement digital multimedia signal receiving according to any one of the embodiments of the present invention. method.
  • FIG. 2 the structure of a physical signal frame of a digital multimedia signal provided by an embodiment of the present invention is illustrated.
  • the physical signal frame of the digital broadcasting system is a fixed length, and each physical signal frame is composed of one preamble signal and N data blocks, wherein the data block 1 to the data block M are frame header data blocks, and the data block M+1 to the data block.
  • N is a frame volume data block.
  • the physical signal frame contains one physical signaling pipeline, one physical fast pipeline, one physical tail pipeline, and K physical data pipelines. Wherein, N ⁇ 2, M ⁇ 1, K ⁇ 1, and N, M, and K are integers.
  • a physical signaling pipe for transmitting signaling information is carried from a starting position of the frame header data block, that is, a physical signaling pipe is carried from a position of the data block 1.
  • the number of symbol resources occupied by the physical signaling pipeline may be based on the FEC (Forward Error Correction) codeword number and the FEC codeword length of the physical signaling pipeline in the physical signal frame. And the modulation method is calculated.
  • the total number of bits of all codewords is 1024*P, where P ⁇ 1, P is an integer; P codes are used.
  • the word is modulated into a symbol, and the number of symbol resources occupied by the physical signaling pipeline can be calculated according to the modulation mode. For example, a specific modulation mode is adjusted to one symbol every 2 bits, and one codeword corresponds to 512 symbols, and the physical The number of symbol resources occupied by the signaling pipeline is 512*P.
  • a physical fast pipe for transmitting fast service data is carried from an end position of the physical signaling pipe.
  • the physical fast pipeline is used to transmit fast service data with high time requirements, emphasizing real-time fast performance.
  • the fast service data of physical fast pipeline transmission can be processed without interleaving, and the coding rate can be lower. For example, a code rate of 1/5 can be used.
  • the number of symbol resources occupied by the physical fast pipeline may be calculated according to the number of FEC codewords, the length of the FEC codeword, and the modulation mode of the physical fast pipeline in the physical signal frame to calculate the number of symbol resources occupied by the physical fast pipeline.
  • the remaining symbol resources are used to carry the service data of the physical tail pipeline.
  • a physical data pipe for transmitting service data is carried from a starting position of the frame volume data block, that is, a physical data pipe is carried from a position of the data block M+1.
  • the frame data block of the physical signal frame can carry multiple physical data pipes. As shown in FIG. 2, in this embodiment, the number of physical data pipes is K, and those skilled in the art can divide the physical data pipes according to their needs. The width and number are not explained here.
  • the number of symbol resources occupied by the physical data pipeline may be calculated according to the number of physical data pipes in the physical signal frame, the number of FEC code words per physical data pipe, the length of the FEC codeword, and the modulation mode. .
  • the remaining symbol resources are used to carry the service data of the physical tail pipe.
  • the physical data pipeline is used to transmit service data that is relatively insensitive to time, and can adopt inter-frame and intra-frame interleaving processing and cooperate with a higher coding rate to provide a higher transmission data rate and better transmission quality for the service.
  • the code rate of the fast service data transmitted by the physical fast pipe is lower than the code rate of the service data transmitted by the physical data pipe.
  • a symbol resource not occupied by the physical signaling pipe and the physical fast pipe in the frame header data block and a not in the frame body data block The symbol resources occupied by the physical data pipe collectively carry a physical tail pipe for transmitting service data.
  • the inventors of the present invention have found that under the premise that the fixed physical signal frame length of the digital broadcasting system and the service resources in the frame are flexibly configurable, some residual resources may appear in the physical signal frame, and the embodiment of the present invention uses the remaining resources to transmit the physical pipeline. Data, making full use of system resources.
  • the codeword length of the physical signaling pipe, the codeword length of the physical fast pipe, the codeword length of the physical data pipe, and the codeword length of the physical tail pipe may be the same or different.
  • the signaling information transmitted in the physical signaling pipeline includes a number of frame header data blocks and a number of symbol resources of each frame header data block, and a number of frame body data blocks and each The number of symbol resources for the frame data block.
  • the signaling information transmitted in the physical signaling pipeline includes a signaling information parameter of a physical signaling pipeline, a signaling information parameter of a physical fast pipeline, a signaling information parameter of a physical data pipeline, and a physical tail. Signaling information parameters of the pipeline.
  • the signaling information parameter of the physical signaling pipe includes a number of code words, a codeword length, and a modulation mode of a physical signaling pipe in the physical signal frame.
  • the signaling information parameter of the physical fast pipe includes a number of codewords, a codeword length, and a modulation mode of a physical fast pipe in the physical signal frame.
  • the signaling information parameter of the physical data pipeline includes the number of physical data pipes in the physical signal frame, the number of service transport flows carried by each physical data pipe, and the pipe of each physical data pipe. Width, modulation mode, coding rate, inter-frame interleaving depth parameter, layered multiplexing parameter, cooperative diversity indication, identity of each service transport stream, and width of the service transport stream.
  • the signaling information parameter of the physical tail pipe includes a physical tail pipe codeword start indication information, a width information of the physical tail pipe, a coding bit rate and a modulation mode adopted by the physical tail pipe. .
  • the width of the physical tail pipe is the remaining symbol resource after the physical signaling pipe, the physical fast pipe, and the physical data pipe are filled in the physical signal frame, and the data size transmitted by each frame of the physical tail pipe cannot be guaranteed to be an integer number of tail pipe FEC code words. Therefore, the physical tail pipe codeword start indication information needs to be transmitted in the physical signaling pipe.
  • the physical tail pipe codeword start indication information is used by the receiving end to perform tail pipe codeword synchronization. For example, the physical tail pipe transmits data of 1000 symbols per frame, and one tail pipe codeword corresponds to 512 symbols.
  • the tail pipe codeword start indication information indicates the starting position of the codeword of the tail pipe in the physical signal frame. .
  • the receiving end calculates the number of symbol resources occupied by the physical signaling pipeline according to the number of FEC codewords, the length of the FEC codeword, and the modulation mode of the physical signaling pipe in the physical signal frame.
  • the receiving end calculates the number of symbol resources occupied by the physical fast pipeline according to the number of FEC codewords, the length of the FEC codeword, and the modulation mode of the physical fast pipeline in the physical signal frame.
  • the receiving end calculates the number of symbol resources occupied by the physical data pipeline according to the number of physical data pipes in the physical signal frame, the number of FEC codewords per physical data pipe, the length of the FEC codeword, and the modulation mode. .
  • the receiving end calculates the total number of symbol resources of the frame header data block according to the number of frame header data blocks and the number of symbol resources of each frame header data block.
  • the receiving end calculates the total number of symbol resources of the frame volume data block according to the number of frame volume data blocks and the number of symbol resources of each frame volume data block.
  • the receiving end determines the physical tail pipe in the frame header data block according to the total number of symbol resources of the frame header data block, the number of symbol resources occupied by the physical signaling pipe, and the number of symbol resources occupied by the physical fast pipe.
  • the occupied symbol resource; the symbol resource occupied by the physical tail pipe in the frame body data block is determined according to the total symbol resource quantity of the frame body data block and the number of symbol resources occupied by the physical data pipe.
  • the receiving end extracts the symbol resources of the physical tail pipe from the frame header data block and the frame body data block respectively, and according to the physical tail pipe codeword start indication information in the signaling information, from the physical tail pipe of the physical signal frame The starting symbol position corresponding to the physical tail pipe codeword is determined in the symbol resource.
  • an embodiment of the present invention provides a digital multimedia signal sending method in a digital broadcasting system, including the following steps:
  • the transmitting end converts the service data from the upper layer into a physical data pipeline bit stream, performs scrambling; performs BCH encoding on the scrambled physical data pipeline bit stream; and performs LDPC encoding on the BCH encoded physical data pipeline bit stream;
  • the LDPC encoded physical data pipeline bit stream performs block bit interleaving; inter-frame interleaving of the physical data pipeline bit stream after block bit interleaving; constellation mapping of the physical data pipeline bit stream after inter-frame interleaving;
  • the physical data pipeline bit stream is hierarchically multiplexed to form a physical data pipeline data symbol;
  • the transmitting end converts the signaling data from the upper layer into a physical signaling pipeline bit stream, performs scrambling code, performs LDPC encoding on the physical signaling pipeline bit stream after the scrambling code, and performs LDPC encoded physical signaling pipeline bit stream.
  • Constellation mapping which constitutes a physical signaling pipeline data symbol
  • the transmitting end converts the fast service data from the upper layer into a physical fast pipeline bit stream, performs scrambling code, performs LDPC encoding on the scrambled physical fast pipeline bit stream, and performs constellation mapping on the LDPC encoded physical fast pipeline bit stream. Forming physical fast pipeline data symbols;
  • the transmitting end converts the service data from the upper layer into a physical tail pipe bit stream, performs scrambling; performs BCH encoding on the physical tail pipe bit stream after the scrambling code; performs LDPC encoding on the BCH encoded physical tail pipe bit stream;
  • the LDPC-encoded physical tail pipe bit stream performs block bit interleaving; the block-bit interleaved physical tail pipe bit stream is constellated to form a physical tail pipe data symbol;
  • the preamble signal, the intra pilot symbol, the data symbol on the frame header data block, and the data symbol on the frame body data block are multiplexed together to form a physical signal frame;
  • the physical signal frame is transformed from baseband to radio frequency for transmission.
  • the signaling data includes: a signaling information parameter of a physical signaling pipe, a signaling information parameter of a physical data pipe, a signaling information parameter of a physical fast pipe, and signaling information of a physical tail pipe.
  • a parameter; the signaling information parameter of the physical tail pipe includes a physical tail pipe codeword start indication information.
  • the signaling information parameter of the physical tail pipe further includes width information of the physical tail pipe.
  • the signaling information parameter of the physical tail pipe further includes an encoding code rate and a modulation mode adopted by the physical tail pipe.
  • the signaling information parameter of the physical signaling pipe includes a number of code words, a codeword length, and a modulation mode of a physical signaling pipe in the physical signal frame.
  • the signaling information parameter of the physical fast pipe includes a number of codewords, a codeword length, and a modulation mode of a physical fast pipe in the physical signal frame.
  • the signaling information parameter of the physical data pipe includes the number of physical data pipes in the physical signal frame, the number of service transport streams (S-TS) carried by each physical data pipe, and each Pipe width, modulation mode, code rate, inter-frame interleaving depth parameter, layered multiplexing parameter, cooperative diversity indication, identity of each service transport stream, and width of the service transport stream of the physical data pipeline.
  • S-TS service transport streams
  • the preamble signal contains information about a type of data block indicating a physical signal frame.
  • the data block type is used to indicate the following parameters of the physical signal frame: the number of data blocks of the physical signal frame, the number of frame header data blocks, the length of the data block, and the number of pilot symbols included in each data block. And the number of data groups.
  • the data block type is also used to indicate the following parameters of the physical signal frame: the number of interleaved matrix rows and the number of columns in the intraframe interleaving.
  • the transmitting end uses a plurality of broadcast transmission channels to cooperatively transmit the transmission mode.
  • Embodiments of the present invention provide a digital multimedia signal receiving method in a digital broadcasting system, including the following steps:
  • Extracting service data carried by the physical tail pipe by performing constellation mapping, deblocking bit interleaving, LDPC decoding, BCH decoding, and descrambling code;
  • the signaling data, the fast service data, and the service data are sent to the upper layer.
  • the signaling data includes: a signaling information parameter of a physical signaling pipe, a signaling information parameter of a physical data pipe, a signaling information parameter of a physical fast pipe, and signaling information of a physical tail pipe.
  • a parameter; the signaling information parameter of the physical tail pipe includes a physical tail pipe codeword start indication information.
  • the signaling information parameter of the physical tail pipe further includes width information of the physical tail pipe.
  • the signaling information parameter of the physical tail pipe further includes an encoding code rate and a modulation mode adopted by the physical tail pipe.
  • the signaling information parameter of the physical signaling pipe includes a number of code words, a codeword length, and a modulation mode of a physical signaling pipe in the physical signal frame.
  • the signaling information parameter of the physical fast pipe includes a number of codewords, a codeword length, and a modulation mode of a physical fast pipe in the physical signal frame.
  • the signaling information parameter of the physical data pipeline includes the number of physical data pipes in the physical signal frame, the number of service transport flows carried by each physical data pipe, and the pipe of each physical data pipe. Width, modulation mode, coding rate, inter-frame interleaving depth parameter, layered multiplexing parameter, cooperative diversity indication, identity of each service transport stream, and width of the service transport stream.
  • the above method embodiment further includes the step of parsing the data block type of the physical signal frame of the baseband signal according to the synchronized preamble signal; the data block type is used to indicate the following parameters of the physical signal frame: physical The number of data blocks of the signal frame, the number of header data blocks, the length of the data block, the number of pilot symbols included in each data block, and the number of data groups.
  • the data block type is further used to indicate the following parameters of the physical signal frame: the number of interleaved matrix rows and the number of columns in the interframe; the inter-frame interleaving, demultiplexing, solution constellation mapping, solution Inter-frame interleaving, deblocking bit interleaving, LDPC decoding, BCH decoding, descrambling, extracting service data carried by the physical data pipeline; de-inter-frame interleaving, de-constellation mapping, deblocking bit interleaving, LDPC decoding BCH decoding and descrambling code extract the service data carried by the physical tail pipe.
  • N bw is the system bandwidth expansion factor, and the values are 1, 2, 4, and 8.
  • the scrambling code sequence generator provided by the embodiment of the present invention is shown in FIG. 4, which generates a scrambling code sequence according to the parameter table provided in Table 3.
  • the code length of the BCH code provided by the embodiment of the present invention is 17280 bits, wherein the information bit length is 16980, the check bit length is 300, and the 20-bit error can be corrected.
  • the minimum polynomial of the BCH code is shown in Table 4.
  • the BCH code generator polynomial g(x) can be obtained by multiplying g 1 (x) to g 20 (x) in Table 4.
  • the specific manner of the LDPC encoding provided by the embodiment of the present invention is: the physical signaling pipeline and the physical fast pipeline adopt an LDPC code with a code length of 7200 bits and a code rate of 1/5, and the information bit length is 1440 bits.
  • a codeword having a code rate higher than 1/2 is generated by puncturing by 1/2 code, so that its mother code is 1/2 codeword.
  • Codewords with a code rate of 2/5 and 1/3 are generated by 1/4 code by puncturing, so the mother code is 1/4 code word.
  • the physical data pipeline bit stream is taken as an example to illustrate the specific manner of the block bit interleaving provided by the embodiment of the present invention.
  • the physical data pipeline bit stream is encoded by the LDPC to obtain the encoded codeword U.
  • the encoded codeword U is interleaved with rows and columns, and then the bit is performed. Replacement.
  • block bit interleaving of different column numbers can be performed.
  • N C is the number of columns of block bit interleaving, which is related to the modulation mode
  • N R1 and N R2 are the number of rows of U' 1 unit and U' 2 unit, respectively.
  • the row and column parameters of the block bit interleaving are as shown in Table 6.
  • Bit stream obtained by interleaving rows and columns The output bit stream is replaced by the following method
  • N LDPC is the code length
  • N C is the number of columns of block bit interleaving
  • t is the number of groups of codewords of length N LDPC per group of Nc bits, and t is an integer
  • s is followed by
  • the parameters related to the modulation mode represent the order after the replacement of each group of N C bits.
  • e s is a parameter related to the code rate and represents the order before the replacement of each group of N C bits.
  • the bit replacement method of block bit interleaving is as shown in Table 7.
  • the bit replacement manner of the block bit interleaving is as shown in Table 8.
  • the bit replacement manner of the block bit interleaving is as shown in Table 9. Taking Table 7 as an example, in the 8PSK modulation mode, if the code rate is 1/4 standard code, the order of 6 bits of each group will be from "3, 0, 5, 1, in the process of one bit permutation. 2, 4" is adjusted to "0, 1, 2, 3, 4, 5".
  • the inter-frame interleaving in the embodiment of the present invention performs interleaving by using the frame length as a basic interleaving depth unit.
  • Inter-frame interleaving includes input processing, interleaving, and output processing.
  • Each physical data pipeline independently performs inter-frame interleaving processing.
  • the specific inter-frame interleaving structure is shown in FIG. 6.
  • Each physical data pipe has W pipeCWs parallel inter-frame interleavers, and each inter-frame interleaver uses one LDPC code word as a basic operation unit. Where W pipeCWs is the width of the current physical data pipe in units of LDPC code words.
  • Inter-frame interleaving input processing Each LDPC codeword output by the physical data pipeline through block-bit interleaving is divided into a plurality of interleaved units IU having a length of 720 bits by inter-frame interleaving input processing.
  • each inter-frame interleaver allocates the IU data of one codeword in the current physical signal frame and the IU data of the corresponding codeword in other physical signal frames to the interleaved one through inter-frame interleaving.
  • the kernel function of the interleaver is an irregular convolution block interleaver.
  • Fig. 7 shows the basic structure of the interleaver. D in Fig. 7 is the tap delay unit of the interleaver, and its length (i.e., the tap coefficient of the interleaver) represents the interleaving depth of the tap. Mod(N IU_CW -1,32) is a remainder function.
  • All inter-frame interleavers for each physical data pipe have the same internal tap delay structure.
  • the number of inter-interleaver taps per IU_CW codeword length / 720.
  • the tap coefficients of the interleaver (in frames) can be calculated according to the corresponding parameters in Tables 20 and 25 of the physical signaling information.
  • Inter-frame interleaving output processing Interleaving units IU outputted through the inter-frame interleaver are arranged and output in a certain order. According to the reorganization identification parameter F regroup in the physical signaling information table 20, the following two output modes are arranged:
  • F regroup 0 indicates that the reorganization is off.
  • the interleaver output is arranged in units of code words. First read from tap 0 to tap 1 interleavers N IU_CW -1 the number N IU_CW IU, the output codeword interleaving composition 1, then interlace 2 from tap 0 to tap N IU_CW -1 reads a N IU_CW The IU, after interleaving, outputs the codeword 2 until the N IU_CW IUs of all the interleavers are read, and the interleaved output codeword W pipeCWs is formed .
  • the interleaver output is arranged in units of IU.
  • W pipeCWs a first read output from the taps 0 IU 1 to interleaver interleaving W pipeCWs, followed by a read W pipeCWs 1 IU interleaver output tap 1 to interleaver W pipeCWs from 1 up to the interleaver
  • the W pipeCWs IU outputs are read on the tap N IU_CW of the interleaver W pipeCWs .
  • the I component (in-phase component) and the Q component (quadrature component) are respectively the horizontal and vertical axes.
  • Hierarchical multiplexing is a constellation superposition method. Layered multiplexing superimposes traffic streams (S-TS) belonging to different layers in a physical data pipeline by constellation mapping to form data symbols to be transmitted in the physical data pipeline.
  • S-TS traffic streams
  • the embodiment of the invention defines a two-layer hierarchical multiplexing system, and the two layers are respectively a base layer and an enhancement layer.
  • the hierarchical multiplexing method provided by the embodiment of the present invention is shown in FIG. 13, Table 11 provides 15 hierarchical multiplexing modes supported by the system, and the hierarchical multiplexing indication parameter in Table 20 is used to select which of the tables 11 A layered multiplexing approach.
  • the embodiment of the present invention defines a two-layer hierarchical multiplexing system, and the two layers are respectively a base layer and an enhancement layer.
  • the data of each S-TS in the physical data pipeline is constellated.
  • the symbol is divided into a base layer S-TS data symbol S 1 and an enhancement layer S-TS data symbol S 2 according to the signaling information.
  • Power control of the enhancement layer S-TS data symbol S 2 yields ⁇ S 2 , where ⁇ is the power control coefficient.
  • Constellation superposition is performed on S 1 and ⁇ S 2 to obtain S 1 + ⁇ S 2
  • power normalization processing is performed on S 1 + ⁇ S 2 to obtain ⁇ (S 1 + ⁇ S 2 ), where ⁇ is a power normalization parameter.
  • intra-frame interleaving uses a data group as a basic operation unit, and performs intra-block interleaving on all data groups on a frame volume data block in a physical signal frame.
  • intraframe interleaving is performed in line (top to bottom); as shown in FIG. 14(b), reading is performed in the order of columns (from left to right); N row is The number of rows of the interleaving matrix, N column is the number of columns of the interleaving matrix.
  • the intraframe interleaving parameters can be seen in Table 12 to Table 14.
  • the FH Mult is a frame header data block expansion factor, and the information is transmitted through the physical signaling pipeline, and the values may be 1, 2, 3, and 4.
  • Each physical signal frame is composed of one preamble signal and N data blocks.
  • the preamble signal is composed of P intra-frame pilots and a preamble signal body.
  • the first M data blocks in the frame are frame header data blocks, and mainly carry physical signaling pipe data and physical fast pipe data.
  • the latter N-M data blocks are frame body data blocks, and mainly carry physical data pipe data.
  • Each data block in the frame is composed of P intra-frame pilot symbols and B data groups, and each data group contains 16 data symbols. If the frame header data block data group cannot be filled by the physical signaling pipe and the physical fast pipe data, the remaining data group resources are used to carry the physical tail pipe data. If the data group in the frame data block cannot be filled by the physical data pipeline, the remaining data group resources are used to carry the physical tail pipeline data.
  • the physical signal frame structure parameter provided by the embodiment of the present invention is specifically: the digital broadcast system provides eight types of data block types, and the number N of data blocks included in the physical signal frame under different data block types, the number M of the frame header data blocks, The length of the data block, the number of pilot symbols P included in each data block, and the number B of data groups are the same or different.
  • the data block type information used by the digital broadcasting system is carried by the leading signal body.
  • the specific parameters of the data block type are shown in Table 15, where FH Mult is the frame header data block spreading factor.
  • the preamble signal provided by the embodiment of the present invention is specifically: the total length of the preamble signal is (4096 ⁇ N bw ) data symbols, and is composed of a pilot symbol and a main body of the preamble signal, and the preamble signal body carries the current The data block type information used by the physical signal frame in the physical channel.
  • the leading signal body is composed of a basic segment, a repeating modulation segment and a filling segment B pad . Comprising a base section and a known sequence segment B local signaling sequence segment B sig, a known sequence segment B local system for detecting a bandwidth parameter N bw, section B sig signaling sequence data indicating the block type.
  • the repeated modulation segment is mainly used for synchronization, and the repeated modulation segment includes a known sequence repetition modulation segment R local and a signaling sequence repetition modulation segment R sig , and the known sequence repetition modulation segment R local is a known sequence segment B local basis in the basic segment.
  • the frequency offset modulation is formed on the signalling sequence repeating modulation section R sig by performing frequency offset modulation on the basis of the signaling sequence segment B sig of the basic segment.
  • the pilot symbols in the preamble are the same as the pilot symbols in the data block of the physical signal frame.
  • the intra pilot according to the embodiment of the present invention is specifically configured to generate a pilot symbol of length P according to the sequence generation manner of FIG. 16 and according to the parameters provided in Table 15.
  • the composition of c 1 and c 2 is as follows:
  • the padding symbol z is a BPSK symbol obtained by mapping from bit 1.
  • the Zadoff-Chu sequence q is generated as follows:
  • t and u are the order and root number of the Zadoff-Chu sequence, respectively.
  • Exp is an exponential operation function.
  • the specific manner of the cooperative diversity provided by the embodiment of the present invention is: in order to improve the coverage and receiving performance of the digital broadcast system, the system may adopt multiple broadcast transmission channels to jointly broadcast and transmit, and the same service transport stream (S-TS) passes specific
  • S-TS service transport stream
  • the number of service transport streams (S-TSs) included in the physical data pipeline to be merged in different transport channels and the width of each service transport stream (S-TS) are the same, and the mother codes of the LDPC codewords used in the pipeline to be merged are the same. And the number of LDPC codewords transmitted in the respective physical signal frames is the same; the receiving end performs the scheduling period alignment of the data to be merged by the scheduling period countdown parameter of the physical data pipeline in the physical signaling information, and implements cooperative diversity collection and reception.
  • the physical signaling pipeline can be fixedly modulated by the QPSK mode.
  • the modulation mode parameter of the physical signaling pipeline in this embodiment does not actually appear in the physical signaling pipeline.
  • the physical signaling pipe signaling data transmission N si LDPC codewords with a code length of 7200 and a code rate of 1/5 carry 1408*N si signaling data.
  • the modulation mode adopted by the physical signaling pipeline needs to be described in the physical signaling information table.
  • the physical signaling is arranged in the following manner and transmitted on the physical signaling pipeline.
  • the information definition of the physical signaling pipeline is given in the relevant tables.
  • the information of the physical signaling pipe is composed of two parts: fixed area information and variable area information.
  • the fixed area information includes N si 1304-bit segments, and the variable area information includes N si 104-bit segments.
  • the signaling data is arranged in units of 1440 bits and transmitted on N si LDPC code words; each 1440 bits of physical signaling is further divided into 2 segments, and the first 1320 bits are fixed signaling segments, including 1304 bits.
  • Fixed signaling and 16-bit CRC check, the last 120 bits are variable signaling segments, including 104-bit variable signaling and 16-bit CRC check, in the lower picture of Figure 14 in the 1440 bits 1304+16 bits are fixed signaling segments, and the last 104+16 bits are variable signaling segments.
  • the physical signal frame is a physical data pipeline total number N pipe, S-TS total number of M sts.
  • the variable area information of the physical signaling pipe shown in Table 17 is successively mapped to the variable signaling segment in sequence.
  • the generator polynomial g(x) x 16 +x 12 +x 5 +1 of the CRC check word, and the initial value of the shift register is 0xFFFF.
  • the block diagram of the CRC shift register is shown in Figure 18.
  • CRC16 encoding process is as follows: First, the CRC encoder to be input sequence "s K-1, s K -2, ... s 0" at the last padding 16 bit "0", the filling new sequence after 0 "S K-1 , s K-2 , ... s 0 , 0 , 0, ... 0" are input to the shift register shown in Fig. 18. When the last bit of the new sequence is completed, the registers D 15 to D 0 are The 16 bits of information are the corresponding CRC check words.
  • the specific situation of the physical fast pipeline provided by the embodiment of the present invention is: physical fast pipeline transmission of N fc LDPC codewords with a code length of 7200 and a code rate of 1/5, carrying 1440*N fc fast service data.
  • Table 18 is a fixed parameter of the physical signal frame.
  • Table 19 is a variable parameter of the physical signal frame.
  • the frame index is the number of the physical signal frame, and the daily zero point is calculated from 0 to indicate that the current frame is the first few frames of the day.
  • the event countdown count is used to indicate the time information of the next S-TS. Generally, the next S-TS will be identified by a few frames.
  • Table 20 is a fixed parameter of the physical data pipeline.
  • the power of the basic layer of the physical data pipeline is unchanged, and the enhancement layer is multiplied by the power enhancement factor. For details, see Table 11.
  • Table 21 is a table of LDPC code rate parameters of the physical tail pipe. Each code rate parameter corresponds to an LDPC code. For example, the code rate parameter “0” indicates that the physical data pipe uses a 6/7 standard code.
  • Rate parameter LDPC code 0 6/7 standard code 7 1/4 standard code 1 3/4 standard code 8 6/7 complementary code 2 2/3 standard code 9 3/4 complementary code 3 3/5 standard code 10 2/3 complementary code 4 1/2 standard code 11 3/5 complementary code 5 2/5 standard code 12 2/5 complementary code
  • Table 22 is a fixed parameter table for the physical tail pipe.
  • Table 23 is a variable parameter table of the physical tail pipe, wherein the codeword start offset D StartAddress is the physical tail pipe codeword start indication information.
  • Table 24 is a parameter table of an S-TS (Service Transport Stream) of a physical tail pipe, a physical fast pipe, and a physical data pipe.
  • S-TS Service Transport Stream
  • Table 25 is a block parameter table of the interframe interleaver.
  • the digital multimedia signal transmitting and receiving method and device in the digital broadcasting system provided by the embodiment of the present invention can realize a service working in multiple different transmission channels, and multiple data transmission pipelines in one transmission channel, satisfying multiple services. Different needs.
  • the method and device for transmitting and receiving digital multimedia signals in the digital broadcasting system can improve service coverage and improve service reception quality, and at the same time, the system can provide a physical data pipeline with high QOS for services that are insensitive to transmission delay.
  • the transmission can also provide physical fast pipeline transmission for the service with higher transmission delay requirement, so that the system can flexibly support the transmission of various services.
  • the digital multimedia signal transmitting and receiving method and device in the digital broadcasting system provided by the embodiment of the present invention utilizes the remaining resources of the system to carry a physical tail pipe for transmitting service data, thereby reducing system resource waste.
  • the signaling data transmission device 1000 can be implemented in a variety of ways.
  • the data transfer device 1000 can be implemented by an instruction configuration processor.
  • the instructions may be stored in the ROM, and when the device is booted, the instructions are read from the ROM into the programmable device to implement the data transfer device 1000.
  • data transmission device 1000 can be cured into a dedicated device (eg, an ASIC).
  • the data transmission device 1000 can be divided into mutually independent units, or they can be implemented together.
  • the data transmission device 1000 may be implemented by one of the various implementations described above, or may be implemented by a combination of two or more of the various implementations described above.
  • the invention can be a system, method and/or computer program product.
  • the computer program product can comprise a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement various aspects of the present invention.
  • the computer readable storage medium can be a tangible device that can hold and store the instructions used by the instruction execution device.
  • the computer readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing.
  • Non-exhaustive list of computer readable storage media include: portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM) Or flash memory), static random access memory (SRAM), portable compact disk read only memory (CD-ROM), digital versatile disk (DVD), memory stick, floppy disk, mechanical encoding device, for example, with instructions stored thereon A raised structure in the hole card or groove, and any suitable combination of the above.
  • a computer readable storage medium as used herein is not to be interpreted as a transient signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (eg, a light pulse through a fiber optic cable), or through a wire The electrical signal transmitted.
  • the computer readable program instructions described herein can be downloaded from a computer readable storage medium to various computing/processing devices or downloaded to an external computer or external storage device over a network, such as the Internet, a local area network, a wide area network, and/or a wireless network.
  • the network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and/or edge servers.
  • a network adapter card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in each computing/processing device .
  • Computer program instructions for performing the operations of the present invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine related instructions, microcode, firmware instructions, state setting data, or in one or more programming languages.
  • the computer readable program instructions can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer, partly on the remote computer, or entirely on the remote computer or server. carried out.
  • the remote computer can be connected to the user's computer through any kind of network, including a local area network (LAN) or wide area network (WAN), or can be connected to an external computer (eg, using an Internet service provider to access the Internet) connection).
  • the customized electronic circuit such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), can be customized by utilizing state information of computer readable program instructions.
  • Computer readable program instructions are executed to implement various aspects of the present invention.
  • the computer readable program instructions can be provided to a general purpose computer, a special purpose computer, or a processor of other programmable data processing apparatus to produce a machine such that when executed by a processor of a computer or other programmable data processing apparatus Means for implementing the functions/acts specified in one or more of the blocks of the flowcharts and/or block diagrams.
  • the computer readable program instructions can also be stored in a computer readable storage medium that causes the computer, programmable data processing device, and/or other device to operate in a particular manner, such that the computer readable medium storing the instructions includes An article of manufacture that includes instructions for implementing various aspects of the functions/acts recited in one or more of the flowcharts.
  • the computer readable program instructions can also be loaded onto a computer, other programmable data processing device, or other device to perform a series of operational steps on a computer, other programmable data processing device or other device to produce a computer-implemented process.
  • instructions executed on a computer, other programmable data processing apparatus, or other device implement the functions/acts recited in one or more of the flowcharts and/or block diagrams.
  • each block in the flowchart or block diagram can represent a module, a program segment, or a portion of an instruction that includes one or more components for implementing the specified logical functions.
  • Executable instructions can also occur in a different order than those illustrated in the drawings. For example, two consecutive blocks may be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending upon the functionality involved.
  • each block of the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts can be implemented in a dedicated hardware-based system that performs the specified function or action. Or it can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that implementation by hardware, implementation by software, and implementation by a combination of software and hardware are equivalent.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Error Detection And Correction (AREA)

Abstract

La présente invention concerne un dispositif d'envoi et un dispositif de réception de signaux multimédias numériques, et des procédés associés. Un terminal d'envoi forme un symbole de données de canal de données physique, un symbole de données de canal de signalisation physique, un symbole de données de canal rapide physique et un symbole de données de canal de queue physique, et mappe le symbole de données de canal de signalisation physique et le symbole de données de canal rapide physique sur un symbole de données d'un bloc de données d'en-tête de trame d'une trame de signal physique, le symbole de données de canal de données physique sur un symbole de données d'un bloc de données de corps de trame, et le symbole de données de canal de queue physique sur les ressources de symboles de données restantes du bloc de données d'en-tête de trame et du bloc de données de corps de trame. Un terminal de réception extrait les données transportées sur des canaux respectifs au moyen de modes de traitement correspondants respectivement.
PCT/CN2018/102338 2017-09-07 2018-08-24 Dispositif d'envoi et dispositif de réception de signaux multimédias numériques, et procédés associés WO2019047733A1 (fr)

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