WO2016194623A1 - データ処理装置、およびデータ処理方法 - Google Patents
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
- H03M13/2792—Interleaver wherein interleaving is performed jointly with another technique such as puncturing, multiplexing or routing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
- H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
- H03M13/1105—Decoding
- H03M13/1145—Pipelined decoding at code word level, e.g. multiple code words being decoded simultaneously
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
- H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
- H03M13/1148—Structural properties of the code parity-check or generator matrix
- H03M13/116—Quasi-cyclic LDPC [QC-LDPC] codes, i.e. the parity-check matrix being composed of permutation or circulant sub-matrices
- H03M13/1165—QC-LDPC codes as defined for the digital video broadcasting [DVB] specifications, e.g. DVB-Satellite [DVB-S2]
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
- H03M13/255—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] with Low Density Parity Check [LDPC] codes
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
- H03M13/2703—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques the interleaver involving at least two directions
- H03M13/271—Row-column interleaver with permutations, e.g. block interleaving with inter-row, inter-column, intra-row or intra-column permutations
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
- H03M13/2778—Interleaver using block-wise interleaving, e.g. the interleaving matrix is sub-divided into sub-matrices and the permutation is performed in blocks of sub-matrices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/35—Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics
- H03M13/356—Unequal error protection [UEP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0043—Realisations of complexity reduction techniques, e.g. use of look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
- H04L1/0058—Block-coded modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
Definitions
- the present disclosure relates to a data processing device and a data processing method, and more particularly, to a data processing device and a data processing method that optimize an input to an LDPC decoder that performs parallel processing with a predetermined bit width.
- LDPC Low Density Parity Check
- DVB Digital Video Broadcasting
- DVB-S.2 in Europe
- ATSC Advanced Television Systems Committee
- FIG. 1 shows the robustness in the case of transmitting 64800 bits, which is a data unit of an LDPC code, by the 64K16QAM system, for example.
- 64,800 bits are composed of 180 360-bit bit strings, and the robustness differs in units of 360 bits.
- bit interleaving is performed so that the robustness of the bit string is distributed.
- Fig. 2 shows the state of bit interleaving processing conventionally used in DVB-T.2. As described above, in this interleaver (Permute), bit interleaving processing is executed only for the purpose of distributing robustness.
- FIG. 3 shows an example of an LDPC decoder that decodes an LDPC code, which is adopted in a receiving device such as DVB-T.2, and the configuration of the preceding stage.
- the transmission data is LDPC-encoded on the transmission side, and after the bit interleaving process is performed, the LDPC code 11 transmitted according to the 64K16QAM system is input one symbol (4 bits) at a time.
- the demapper 12 calculates the probability that it is 0 and the probability that it is 1 for each bit constituting one symbol.
- Bit deinterleaver (Bit DeINT Memory) 13 performs bit deinterleave (rearrangement) processing for restoring bit interleaving (reordering) processing performed on the transmission side.
- the LDPC decoder 14 converts the serially input data string after the bit interleaving inverse processing into a predetermined bit width (360 bits in the case of 64K16QAM), and then converts the probability of zeroness of each bit of the predetermined bit width to The original transmission data before LDPC encoding is restored based on the probability of oneness.
- the LDPC decoder provided on the receiving side is configured to perform parallel processing in units of a predetermined bit width (360 bits in the case of the 64K16QAM system).
- serial processing is performed by the demapper 12 and the bit deinterleaver 13 in the preceding stage of the LDPC decoder 14, so that the demapper 12 and the bit deinterleaver 13 become a bottleneck, and the LDPC code It was a factor to delay the time required to restore the.
- the present disclosure has been made in view of such a situation, and efficiently decodes LDPC codes in which bit interleaving processing is performed in consideration of not only robustness distribution but also processing units of parallel processing in an LDPC decoder. It is something that can be done.
- data to be transmitted is LDPC encoded on the transmission side, and the resulting LDPC code is mapped to a symbol on a complex plane corresponding to a predetermined modulation scheme.
- the data processing apparatus for processing the bit-interleaved data sequence in which the mapped data sequence representing the symbol is bit-interleaved in a predetermined bit group unit and transmitted according to the predetermined modulation method from the transmission side
- the second data is obtained by executing in parallel the demapping process corresponding to the mapping on the transmission side for the first data string to be processed corresponding to the transmitted bit interleaved data string.
- a parallel demapping unit for obtaining a sequence, and the transmission for the second data sequence A bit interleave inverse processing unit that obtains a third data string by executing in parallel a bit interleave inverse process corresponding to the bit interleave in, and decodes the third data string input in parallel in the bit group unit LDPC decoding unit.
- the data processing device obtains a fourth data string by executing, in parallel, the same bit interleaving processing as the bit interleaving on the transmission side with respect to the output of the LDPC decoding unit
- a bit interleaving processing unit can be further provided, and the parallel demapping unit executes the demapping processing corresponding to the mapping on the transmitting side in parallel with the fourth data string as a processing target, thereby performing the second processing. Can be obtained.
- the predetermined modulation method may be a 64K16QAM method, and the predetermined bit group unit may be 360 bits.
- data to be transmitted is LDPC encoded on the transmission side, and the resulting LDPC code is mapped to a symbol on a complex plane corresponding to a predetermined modulation method.
- the data sequence representing the mapped symbol is bit-interleaved in a predetermined bit group unit and the bit-interleaved data sequence transmitted according to the predetermined modulation scheme is a processing target.
- the demapping processing corresponding to the mapping on the transmission side is performed on the first data sequence to be processed, which corresponds to the bit interleaved data sequence transmitted from the transmission side, by the data processing device.
- Parallel demapping to obtain the second data string by executing in parallel A bit interleaving inverse processing step for obtaining a third data sequence by executing, in parallel, bit interleaving inverse processing corresponding to the bit interleaving on the transmission side for the second data sequence, and the bit And an LDPC decoding step of decoding the third data string input in parallel in units of groups.
- a data string is obtained, and the third data string input in parallel in bit group units is subjected to LDPC decoding.
- each of a plurality of data to be transmitted is LDPC-encoded and bit-interleaved in a predetermined bit group unit on the transmission side, and then LDM (Layered Division Multiplexing)
- LDM Laned Division Multiplexing
- a parallel demapping processing unit that obtains a second data string by executing in parallel a demapping process that calculates each likelihood of the data to be decoded, with respect to the second data string.
- bit interleaving inverse processing corresponding to the bit interleaving on the transmitting side is executed in parallel.
- a bit interleave inverse processing unit for obtaining a data sequence an LDPC decoding unit for decoding the third data sequence input in parallel in units of bit groups, and the bit on the transmission side with respect to the output of the LDPC decoding unit
- a bit interleave processing unit that obtains a fourth data sequence by executing the same bit interleaving processing as that of interleaving in parallel, and the parallel demapping unit also performs the demapping processing on the fourth data sequence as a processing target.
- a second data string is obtained by executing in parallel.
- the received signal includes a result of LDPC encoding of first data to be transmitted on the transmission side, bit interleaving in units of a predetermined bit group, and modulation using the QPSK method, and second data to be transmitted.
- This data can be LDPC-encoded, bit-interleaved in units of a predetermined bit group, and multiplexed with the result of 64 NUC system multiplexing in the LDM system.
- each of a plurality of data to be transmitted is LDPC-encoded and bit-interleaved in a predetermined bit group unit, and then LDM (Layered Division Multiplexing)
- LDM Layered Division Multiplexing
- first data to be processed corresponding to the received signal transmitted from the transmitting side by the data processing device A parallel demapping process step for obtaining a second data string by executing parallel demapping processing for calculating each likelihood of the data to be decoded with respect to the column other than the data to be decoded as noise
- bit interleaving corresponding to the bit interleaving on the transmission side for the second data string Bit interleaving inverse processing step for obtaining a third data string by executing parallel processing in parallel, LDPC decoding step for decoding the third data string inputted in parallel in bit group units, and LDPC decoding
- bit interleaving process step A bit interleaving process step
- a second data string is obtained by executing in parallel a demapping process for calculating each likelihood of data, and bit interleaving inverse corresponding to the bit interleaving on the transmitting side is performed on the second data string.
- a third data string is obtained by executing the processing in parallel, the third data string input in parallel in the bit group unit is decoded, and the bit on the transmission side is decoded with respect to the output of the decoding.
- a fourth data string is obtained by executing the same bit interleaving process as the interleaving in parallel, and the fourth data Even processed, the second data stream is obtained by performing the de-mapping process in parallel.
- the second aspect of the present disclosure it is possible to efficiently decode even when the LDPC code is multiplexed by the LDM method.
- FIG. 10 is a block diagram illustrating a modification example of the configuration example of the data processing device according to the embodiment of the present disclosure. It is a flowchart explaining the process at the time of reception by the data processor of FIG. It is a figure for demonstrating the multiplexing by an LDM system, and its decoding.
- FIG. 4 illustrates a state of bit interleaving processing performed on the transmission side with respect to the LDPC code to be decoded by the data processing apparatus according to the embodiment of the present disclosure.
- the LDPC code subjected to decoding processing by the data processing apparatus is not only distributed in the robustness of the bit string, but also becomes a processing unit of parallel processing in the LDPC decoder. Bit interleaving processing is performed in consideration of bits.
- FIG. 5 illustrates an LDPC decoder included in the data processing apparatus according to the embodiment of the present disclosure and a configuration example of the preceding stage.
- the data processing apparatus 20 includes a 360-bit demapper 22, a bit deinterleaver 23, a barrel shifter 24, and an LDPC decoder 25.
- the 360-bit demapper 22 includes a plurality of demappers that perform demapping processing, and performs parallel demapping processing. That is, for each bit of the processing target data 21 input in units of 4 ⁇ 360 bits, the probability that it is 0 and the probability that it is 1 are calculated and output to the bit deinterleaver 23.
- the bit deinterleaver 23 performs bit interleaving reverse processing (reverse rearrangement) for restoring the bit interleaving processing (rearrangement) performed on the transmission side, and 360 bits corresponding to four sets of bit interleave reverse processing are performed. Probabilities (0-like probability and 1-like probability) are output to the barrel shifter 24 in order.
- the barrel shifter 24 performs column twist reverse processing corresponding to the column twist processing performed on the transmission side with respect to the input, and outputs the probability of 360 bits after the column twist reverse processing to the LDPC decoder 25 in parallel.
- the LDPC decoder 25 performs LDPC decoding processing. That is, the original transmission data before LDPC coding is restored based on the probability of 0 and 1 probability of each bit of 360 bits input in parallel.
- FIG. 6 is a flowchart for explaining processing at the time of reception by the data processing device 20.
- the processing target data 21 is input to the 360-bit demapper 22 in units of 4 ⁇ 360 bits in step S1.
- the 360-bit demapper 22 performs parallel demapping processing and outputs the processing result to the bit deinterleaver 23 in parallel.
- step S 3 the bit deinterleaver 23 performs bit interleave reverse processing and outputs the processing result to the barrel shifter 24 in parallel.
- step S4 the barrel shifter 24 performs column twist reverse processing on the parallel input, and outputs the processing result to the LDPC decoder 25 in parallel.
- step S5 the LDPC decoder 25 performs an LDPC decoding process. Above, description of the process at the time of reception by the data processor 20 is complete
- the demapping process and the bit interleave inverse process are performed in parallel even in the previous stage of the LDPC decoder 25, so that the data sequence to be processed is delayed with respect to the LDPC decoder 25.
- Parallel input is possible. Therefore, the decoding result of the LDPC code can be obtained more quickly than in the example of the conventional configuration shown in FIG.
- the LDPC decoder can improve the decoding performance (error correction accuracy) by repeating the LDPC decoding process using its own output again as its own input.
- FIG. 7 shows an LDPC decoder included in the data processing apparatus according to the embodiment of the present disclosure and a modification of the configuration example of the preceding stage.
- the data processing device 30 which is the modification is configured to repeatedly execute the LDPC decoding process. That is, the data processing device 30 has a configuration after the LDPC decoder 25 of the data processing device 20 shown in FIG. 5 and with a barrel shifter 31 and a bit interleaver 32 added before the 360-bit demapper 22. .
- the barrel shifter 31 performs the same column twist process as the column twist process performed on the transmission side on the output of the LDPC decoding process, and outputs the processing result to the bit interleaver 32 in parallel.
- the bit interleaver 32 performs the same bit interleaving as the bit interleaving performed on the LDPC code on the transmission side, and outputs the processing result to the 360-bit demapper 22 in parallel.
- FIG. 8 is a flowchart for explaining processing at the time of reception by the data processing device 30.
- the processing target data 21 is input to the 360-bit demapper 22 in units of 4 ⁇ 360 bits in step S11.
- the 360-bit demapper 22 performs parallel demapping processing and outputs the processing result to the bit deinterleaver 23 in parallel.
- step S13 the bit deinterleaver 23 performs bit interleaving reverse processing and outputs the processing result to the barrel shifter 24 in parallel.
- step S14 the barrel shifter 24 performs column twist reverse processing on the parallel input, and outputs the processing result to the LDPC decoder 25 in parallel.
- step S15 the LDPC decoder 25 performs an LDPC decoding process.
- step S16 it is determined whether or not a predetermined condition for ending the process at the time of reception is satisfied.
- a predetermined condition for example, the number of Mr. Kuri in the LDPC decoding process may be set, or a threshold value for error correction accuracy in the LDPC decoding process may be set.
- step S16 If it is determined in step S16 that the predetermined condition is not yet satisfied, the process proceeds to step S17.
- step S ⁇ b> 17 the barrel shifter 31 performs the same column twist processing as that on the transmission side on the parallel input from the LDPC decoder 25, and outputs the processing result to the bit interleaver 32 in parallel.
- step S18 the bit interleaver 32 performs the same bit interleaving processing as that on the transmission side for the parallel input from the barrel shifter 31, and outputs the processing result to the 360-bit demapper 22 in parallel. Thereafter, the process returns to step S12, and the subsequent steps are repeated.
- step S16 If it is determined in step S16 that the predetermined condition is still satisfied, the process at the time of reception ends. Above, description of the process at the time of the reception by the data processor 30 is complete
- the demapping process and the bit interleave inverse process are performed in parallel even before the LDPC decoder 25, so that the data sequence to be processed is delayed with respect to the LDPC decoder 25.
- Parallel input is possible.
- the LDPC decoding process can be repeatedly executed, error correction can be performed with higher accuracy.
- the data processing device 30 which is a modification of the present embodiment can also decode a signal multiplexed by an LDM (Layered Division Multiplexing) method.
- LDM Lane Division Multiplexing
- the LDM method is a method of multiplexing a plurality of error correction codewords in the power direction, and is known to be effective in improving transmission efficiency.
- FIG. 9 shows an outline of multiplexing by the LDM method and decoding thereof.
- the signal A modulated by the QPSK system shown in the upper left of the figure and the signal B modulated by the 64 NUC (non-uniform constellation) system shown in the lower left of the figure are centered in the figure.
- the signals are multiplexed by adding after adjusting the signal amplitude.
- the component of the signal B modulated by the 64NUM system that is the second modulation system is regarded as noise, and is modulated by the QPSK system that is the first modulation system.
- Signal A is decoded.
- the signal B modulated by the 64NUM system which is the second modulation system is decoded.
- the signal A a result obtained by encoding and interleaving with a predetermined LDPC code and then modulating with the QPSK method may be used.
- the signal B a result obtained by encoding and interleaving using the same or different LDPC code as the signal A and then modulating by the 64 NUC method may be used.
- signal A and signal B are encoded by the same LDPC code
- signal A and signal B can be decoded by a common LDPC decoder.
- a signal A that has been encoded and interleaved by a predetermined LDPC code and then modulated by the QPSK method, and a signal B that has been encoded and interleaved by the same LDPC code and then modulated by the 64NUC method are converted by the LDM method.
- a method of decoding the multiplexed reception signal (multiplexed signal) by the data processing device 30 will be described.
- a reception signal (multiplexed signal) as processing target data 21 is input to the 360-bit demapper 22 in units of 4 ⁇ 360 bits.
- the 360-bit demapper 22 calculates each likelihood corresponding to the signal A for the received signal, performs parallel demapping processing, and outputs the processing result to the bit deinterleaver 23 in parallel.
- the bit deinterleaver 23 performs a bit interleaving inverse process corresponding to the bit interleaving process of the signal A performed on the transmission side with respect to the output of the 360-bit demapper 22 inputted in parallel, and the processing result is sent to the barrel shifter 24. Output in parallel.
- the barrel shifter 24 performs column twist reverse processing corresponding to the column twist processing of the signal A performed on the transmission side with respect to the output of the bit deinterleaver 23 input in parallel, and the processing result is parallel to the LDPC decoder 25. Output.
- the LDPC decoder 25 executes LDPC code decoding processing of the signal A in parallel with respect to the output of the barrel shifter 24 input in parallel, and outputs the processing result to the barrel shifter 31 in parallel.
- the barrel shifter 31 performs the same column twist process as the column twist process performed on the signal A on the transmission side with respect to the output of the LDPC decoder 25 input in parallel, and the processing result is parallel to the bit interleaver 23. Output.
- the bit interleaver 23 performs the same bit interleaving process as the bit interleaving process performed on the signal A on the transmission side with respect to the output of the barrel shifter 31 input in parallel, and the processing result is parallel to the 360-bit demapper 22. Output.
- the 360-bit demapper 22 performs a hard-decision decoding process on the output of the 360-bit demapper 22 input in parallel, and performs a process of subtracting from the received signal after performing an amplitude adjustment equivalent to that on the transmission side.
- the 360-bit demapper 22 calculates each likelihood corresponding to the signal B, performs parallel demapping processing, and outputs the processing result to the bit deinterleaver 23 in parallel.
- the process of the bit interleaver 23 and the process of the barrel shifter 24 are performed in parallel as in the process for the signal A. Further, the LDPC decoder 25 executes the LDPC code decoding process of the signal B in parallel with respect to the output of the barrel shifter 24 inputted in parallel, and outputs the processing result in parallel.
- the barrel shifter 31 performs the same column twist process as the column twist process performed on the signal B on the transmission side with respect to the output of the LDPC decoder 25 input in parallel, and the processing result is converted into a bit interleaver. 23 in parallel.
- the bit interleaver 23 performs the same bit interleaving process as the bit interleaving process performed on the signal B on the transmission side with respect to the output of the barrel shifter 31 input in parallel, and the processing result is parallel to the 360-bit demapper 22. Output.
- the 360-bit demapper 22 performs a hard decision decoding process on the output of the 360-bit demapper 22 input in parallel.
- the signal B is output after amplitude adjustment equivalent to that on the transmission side.
- the 360-bit demapper 22 instead of performing a hard decision by the 360-bit demapper 22 after processing the signal A, the 360-bit demapper 22 performs a process for calculating the likelihood of the signal B using the likelihood obtained as a decoding result of the signal A as prior information. You may go.
- iterative decoding such that the signal A process and the signal B process are sequentially performed in an arbitrary order may be performed a plurality of times.
- the number of repetitions of LDPC decoding performed in each LDPC decoding process is set to one or more arbitrary times, and the number of decoding between the outer LDPC decoder and the demapper is set to one or more times for each of the signal A signal B Any number of times may be used.
- the data processing device 30 can be used when decoding a received signal in which two or more signals are multiplexed by the LDM method.
- This indication can also take the following composition.
- Data to be transmitted is LDPC encoded on the transmission side, and the resulting LDPC code is mapped to a symbol on a complex plane corresponding to a predetermined modulation scheme, and a data string representing the mapped symbol is a predetermined bit.
- a data processing apparatus for processing the data sequence that has been bit interleaved in groups and transmitted according to the predetermined modulation method By executing in parallel the demapping process corresponding to the mapping on the transmission side for the first data sequence to be processed, which corresponds to the bit interleaved data sequence transmitted from the transmission side.
- a parallel demapping unit for obtaining two data strings A bit interleave inverse processing unit that obtains a third data sequence by executing in parallel a bit interleave inverse process corresponding to the bit interleave on the transmission side for the second data sequence;
- a data processing apparatus comprising: an LDPC decoding unit that decodes the third data string input in parallel in the bit group unit.
- a bit interleaving processing unit that obtains a fourth data string by executing in parallel the same bit interleaving processing as the bit interleaving on the transmission side with respect to the output of the LDPC decoding unit,
- the parallel demapping unit obtains a second data string by executing in parallel the demapping process corresponding to the mapping on the transmission side, with the fourth data string as a processing target.
- Data processing equipment (3)
- the predetermined modulation method is a 64K16QAM method, The data processing apparatus according to (1) or (2), wherein the predetermined bit group unit is 360 bits.
- Data to be transmitted is LDPC encoded on the transmission side, and the resulting LDPC code is mapped to a symbol on a complex plane corresponding to a predetermined modulation scheme, and a data string representing the mapped symbol is a predetermined bit.
- a data processing method of a data processing device for processing the bit interleaved data sequence that is bit-interleaved in units of groups and transmitted according to the predetermined modulation method.
- the data processing device By executing in parallel the demapping process corresponding to the mapping on the transmission side for the first data sequence to be processed, which corresponds to the bit interleaved data sequence transmitted from the transmission side.
- each of a plurality of data to be transmitted is subjected to LDPC encoding, and a reception signal multiplexed by an LDM (Layered Division Multiplexing) method after being bit-interleaved in a predetermined bit group unit is processed.
- LDM Layerered Division Multiplexing
- the first data sequence to be processed corresponding to the received signal transmitted from the transmission side is regarded as noise other than the data to be decoded and is used to calculate each likelihood of the data to be decoded.
- a parallel demapping processor that obtains the second data string by executing the mapping process in parallel;
- a bit interleave inverse processing unit that obtains a third data sequence by executing in parallel a bit interleave inverse process corresponding to the bit interleave on the transmission side for the second data sequence;
- An LDPC decoding unit for decoding the third data string input in parallel in the bit group unit;
- a bit interleave processing unit that obtains a fourth data sequence by executing in parallel the same bit interleaving as the bit interleaving on the transmission side with respect to the output of the LDPC decoding unit;
- the data processing device wherein the parallel demapping unit obtains a second data string by executing the demapping process in parallel with the fourth data string as a processing target.
- the received signal includes a result of LDPC encoding of first data to be transmitted on the transmission side, bit interleaving in units of a predetermined bit group, and modulation using the QPSK method, and second data to be transmitted.
- the data processing apparatus according to (5), wherein the data is LDPC encoded, bit-interleaved in units of a predetermined bit group, and multiplexed with the result of modulation with the 64 NUC method.
- each of a plurality of data to be transmitted is subjected to LDPC encoding, and a reception signal multiplexed by an LDM (Layered Division Multiplexing) method after being bit-interleaved in a predetermined bit group unit is processed.
- LDM Layerered Division Multiplexing
- the first data sequence to be processed corresponding to the received signal transmitted from the transmission side is regarded as noise other than the data to be decoded and is used to calculate each likelihood of the data to be decoded.
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Abstract
Description
図4は、本開示の実施の形態であるデータ処理装置がデコード処理の対象とするLDPC符号に対して送信側で行われているビットインターリーブ処理の様子を示している。
次に、図5は、本開示の実施の形態であるデータ処理装置が有するLDPCデコーダと、その前段の構成例を示している。
次に図6は、データ処理装置20による受信時の処理を説明するフローチャートである。
ところで、LDPCデコーダは、その特性として、自己の出力を再び自己の入力としてLDPCデコード処理を繰り返すことにより、復号性能(誤り訂正の精度)を向上できることが知られている。
次に図8は、データ処理装置30による受信時の処理を説明するフローチャートである。
本実施の形態の変形例であるデータ処理装置30は、LDM(Layered Division Multiplexing)方式で多重化されている信号についても復号することができる。
(1)
送信側において送信対象のデータがLDPC符号化され、その結果得られたLDPC符号が所定の変調方式に対応した複素平面上のシンボルにマッピングされ、マッピングされた前記シンボルを表すデータ列が所定のビットグループ単位でビットインターリーブされ、前記所定の変調方式に従って伝送されたビットインターリーブ済みの前記データ列を処理対象とするデータ処理装置において、
送信側から伝送されたビットインターリーブ済みの前記データ列に相当する、処理対象とする第1のデータ列に対して、前記送信側における前記マッピングに対応するデマッピング処理をパラレルに実行することにより第2のデータ列を得るパラレルデマッピング部と、
前記第2のデータ列に対して、前記送信側における前記ビットインターリーブに対応するビットインターリーブ逆処理をパラレルに実行することにより第3のデータ列を得るビットインターリーブ逆処理部と、
前記ビットグループ単位でパラレル入力される前記第3のデータ列をデコードするLDPCデコード部と
を備えるデータ処理装置。
(2)
前記LDPCデコード部の出力に対して、前記送信側における前記ビットインターリーブと同じビットインターリーブ処理をパラレルに実行することにより第4のデータ列を得るビットインターリーブ処理部をさらに備え、
前記パラレルデマッピング部は、前記第4のデータ列も処理対象として、前記送信側における前記マッピングに対応するデマッピング処理をパラレルに実行することにより第2のデータ列を得る
前記(1)に記載のデータ処理装置。
(3)
前記所定の変調方式は、64K16QAM方式であり、
前記所定のビットグループ単位は、360ビットである
前記(1)または(2)に記載のデータ処理装置。
(4)
送信側において送信対象のデータがLDPC符号化され、その結果得られたLDPC符号が所定の変調方式に対応した複素平面上のシンボルにマッピングされ、マッピングされた前記シンボルを表すデータ列が所定のビットグループ単位でビットインターリーブされ、前記所定の変調方式に従って伝送されたビットインターリーブ済みの前記データ列を処理対象とするデータ処理装置のデータ処理方法において、
前記データ処理装置による、
送信側から伝送されたビットインターリーブ済みの前記データ列に相当する、処理対象とする第1のデータ列に対して、前記送信側における前記マッピングに対応するデマッピング処理をパラレルに実行することにより第2のデータ列を得るパラレルデマッピングステップと、
前記第2のデータ列に対して、前記送信側における前記ビットインターリーブに対応するビットインターリーブ逆処理をパラレルに実行することにより第3のデータ列を得るビットインターリーブ逆処理ステップと、
前記ビットグループ単位でパラレル入力される前記第3のデータ列をデコードするLDPCデコードステップと
を含むデータ処理方法。
(5)
送信側において、送信対象とされる複数のデータそれぞれがLDPC符号化され、所定のビットグループ単位でビットインターリーブされた後にLDM(Layered Division Multiplexing)方式で多重化されている受信信号を処理対象とするデータ処理装置において、
送信側から伝送された前記受信信号に相当する、処理対象とする第1のデータ列に対して、復号対象とするデータ以外をノイズとみなし、復号対象とするデータの各尤度を算出するデマッピング処理をパラレルに実行することにより第2のデータ列を得るパラレルデマッピング処理部と、
前記第2のデータ列に対して、前記送信側における前記ビットインターリーブに対応するビットインターリーブ逆処理をパラレルに実行することにより第3のデータ列を得るビットインターリーブ逆処理部と、
前記ビットグループ単位でパラレル入力される前記第3のデータ列をデコードするLDPCデコード部と、
前記LDPCデコード部の出力に対して、前記送信側における前記ビットインターリーブと同じビットインターリーブ処理をパラレルに実行することにより第4のデータ列を得るビットインターリーブ処理部と備え、
前記パラレルデマッピング部は、前記第4のデータ列も処理対象として、前記デマッピング処理をパラレルに実行することにより第2のデータ列を得る
データ処理装置。
(6)
前記受信信号は、送信側において、送信対象とされる第1のデータがLDPC符号化され、所定のビットグループ単位でビットインターリーブされ、QPSK方式で変調された結果と、送信対象とされる第2のデータがLDPC符号化され、所定のビットグループ単位でビットインターリーブされ、64NUC方式で変調された結果とがLDM方式で多重化されている
前記(5)に記載のデータ処理装置。
(7)
送信側において、送信対象とされる複数のデータそれぞれがLDPC符号化され、所定のビットグループ単位でビットインターリーブされた後にLDM(Layered Division Multiplexing)方式で多重化されている受信信号を処理対象とするデータ処理装置のデータ処理方法において、
前記データ処理装置による、
送信側から伝送された前記受信信号に相当する、処理対象とする第1のデータ列に対して、復号対象とするデータ以外をノイズとみなし、復号対象とするデータの各尤度を算出するデマッピング処理をパラレルに実行することにより第2のデータ列を得るパラレルデマッピング処理ステップと、
前記第2のデータ列に対して、前記送信側における前記ビットインターリーブに対応するビットインターリーブ逆処理をパラレルに実行することにより第3のデータ列を得るビットインターリーブ逆処理ステップと、
前記ビットグループ単位でパラレル入力される前記第3のデータ列をデコードするLDPCデコードステップと、
前記LDPCデコードステップの出力に対して、前記送信側における前記ビットインターリーブと同じビットインターリーブ処理をパラレルに実行することにより第4のデータ列を得るビットインターリーブ処理ステップと含み、
前記パラレルデマッピングステップは、前記第4のデータ列も処理対象として、前記デマッピング処理をパラレルに実行することにより第2のデータ列を得る
データ処理方法。
Claims (7)
- 送信側において送信対象のデータがLDPC符号化され、その結果得られたLDPC符号が所定の変調方式に対応した複素平面上のシンボルにマッピングされ、マッピングされた前記シンボルを表すデータ列が所定のビットグループ単位でビットインターリーブされ、前記所定の変調方式に従って伝送されたビットインターリーブ済みの前記データ列を処理対象とするデータ処理装置において、
送信側から伝送されたビットインターリーブ済みの前記データ列に相当する、処理対象とする第1のデータ列に対して、前記送信側における前記マッピングに対応するデマッピング処理をパラレルに実行することにより第2のデータ列を得るパラレルデマッピング処理部と、
前記第2のデータ列に対して、前記送信側における前記ビットインターリーブに対応するビットインターリーブ逆処理をパラレルに実行することにより第3のデータ列を得るビットインターリーブ逆処理部と、
前記ビットグループ単位でパラレル入力される前記第3のデータ列をデコードするLDPCデコード部と
を備えるデータ処理装置。 - 前記LDPCデコード部の出力に対して、前記送信側における前記ビットインターリーブと同じビットインターリーブ処理をパラレルに実行することにより第4のデータ列を得るビットインターリーブ処理部をさらに備え、
前記パラレルデマッピング部は、前記第4のデータ列も処理対象として、前記送信側における前記マッピングに対応するデマッピング処理をパラレルに実行することにより第2のデータ列を得る
請求項1に記載のデータ処理装置。 - 前記所定の変調方式は、64K16QAM方式であり、
前記所定のビットグループ単位は、360ビットである
請求項2に記載のデータ処理装置。 - 送信側において送信対象のデータがLDPC符号化され、その結果得られたLDPC符号が所定の変調方式に対応した複素平面上のシンボルにマッピングされ、マッピングされた前記シンボルを表すデータ列が所定のビットグループ単位でビットインターリーブされ、前記所定の変調方式に従って伝送されたビットインターリーブ済みの前記データ列を処理対象とするデータ処理装置のデータ処理方法において、
前記データ処理装置による、
送信側から伝送されたビットインターリーブ済みの前記データ列に相当する、処理対象とする第1のデータ列に対して、前記送信側における前記マッピングに対応するデマッピング処理をパラレルに実行することにより第2のデータ列を得るパラレルデマッピングステップと、
前記第2のデータ列に対して、前記送信側における前記ビットインターリーブに対応するビットインターリーブ逆処理をパラレルに実行することにより第3のデータ列を得るビットインターリーブ逆処理ステップと、
前記ビットグループ単位でパラレル入力される前記第3のデータ列をデコードするLDPCデコードステップと
を含むデータ処理方法。 - 送信側において、送信対象とされる複数のデータそれぞれがLDPC符号化され、所定のビットグループ単位でビットインターリーブされた後にLDM(Layered Division Multiplexing)方式で多重化されている受信信号を処理対象とするデータ処理装置において、
送信側から伝送された前記受信信号に相当する、処理対象とする第1のデータ列に対して、復号対象とするデータ以外をノイズとみなし、復号対象とするデータの各尤度を算出するデマッピング処理をパラレルに実行することにより第2のデータ列を得るパラレルデマッピング処理部と、
前記第2のデータ列に対して、前記送信側における前記ビットインターリーブに対応するビットインターリーブ逆処理をパラレルに実行することにより第3のデータ列を得るビットインターリーブ逆処理部と、
前記ビットグループ単位でパラレル入力される前記第3のデータ列をデコードするLDPCデコード部と、
前記LDPCデコード部の出力に対して、前記送信側における前記ビットインターリーブと同じビットインターリーブ処理をパラレルに実行することにより第4のデータ列を得るビットインターリーブ処理部と備え、
前記パラレルデマッピング部は、前記第4のデータ列も処理対象として、前記デマッピング処理をパラレルに実行することにより第2のデータ列を得る
データ処理装置。 - 前記受信信号は、送信側において、送信対象とされる第1のデータがLDPC符号化され、所定のビットグループ単位でビットインターリーブされ、QPSK方式で変調された結果と、送信対象とされる第2のデータがLDPC符号化され、所定のビットグループ単位でビットインターリーブされ、64NUC方式で変調された結果とがLDM方式で多重化されている
請求項5に記載のデータ処理装置。 - 送信側において、送信対象とされる複数のデータそれぞれがLDPC符号化され、所定のビットグループ単位でビットインターリーブされた後にLDM(Layered Division Multiplexing)方式で多重化されている受信信号を処理対象とするデータ処理装置のデータ処理方法において、
前記データ処理装置による、
送信側から伝送された前記受信信号に相当する、処理対象とする第1のデータ列に対して、復号対象とするデータ以外をノイズとみなし、復号対象とするデータの各尤度を算出するデマッピング処理をパラレルに実行することにより第2のデータ列を得るパラレルデマッピング処理ステップと、
前記第2のデータ列に対して、前記送信側における前記ビットインターリーブに対応するビットインターリーブ逆処理をパラレルに実行することにより第3のデータ列を得るビットインターリーブ逆処理ステップと、
前記ビットグループ単位でパラレル入力される前記第3のデータ列をデコードするLDPCデコードステップと、
前記LDPCデコードステップの出力に対して、前記送信側における前記ビットインターリーブと同じビットインターリーブ処理をパラレルに実行することにより第4のデータ列を得るビットインターリーブ処理ステップと含み、
前記パラレルデマッピングステップは、前記第4のデータ列も処理対象として、前記デマッピング処理をパラレルに実行することにより第2のデータ列を得る
データ処理方法。
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