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WO2015170819A1 - Appareil de multiplexage de signaux recourant au multiplexage par répartition en couches et procédé de multiplexage de signaux - Google Patents

Appareil de multiplexage de signaux recourant au multiplexage par répartition en couches et procédé de multiplexage de signaux Download PDF

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Publication number
WO2015170819A1
WO2015170819A1 PCT/KR2015/001832 KR2015001832W WO2015170819A1 WO 2015170819 A1 WO2015170819 A1 WO 2015170819A1 KR 2015001832 W KR2015001832 W KR 2015001832W WO 2015170819 A1 WO2015170819 A1 WO 2015170819A1
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Prior art keywords
signal
core layer
enhanced layer
power
enhanced
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PCT/KR2015/001832
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English (en)
Korean (ko)
Inventor
박성익
이재영
권선형
김흥묵
허남호
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Publication date
Priority to CN201580019420.7A priority Critical patent/CN106170960B/zh
Priority to EP25158568.3A priority patent/EP4546674A3/fr
Priority to US15/124,646 priority patent/US10164740B2/en
Priority to MX2018008368A priority patent/MX389689B/es
Priority to MX2016012661A priority patent/MX357430B/es
Priority to CN201911250635.6A priority patent/CN110971346B/zh
Priority to CA2942287A priority patent/CA2942287C/fr
Priority to EP15789406.4A priority patent/EP3142313B1/fr
Priority to EP20202101.0A priority patent/EP3800851B1/fr
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Priority to JP2016562259A priority patent/JP6794262B2/ja
Priority claimed from KR1020150026288A external-priority patent/KR102316272B1/ko
Publication of WO2015170819A1 publication Critical patent/WO2015170819A1/fr
Anticipated expiration legal-status Critical
Priority to US16/182,419 priority patent/US10404414B2/en
Priority to US16/515,760 priority patent/US10601548B2/en
Priority to US16/791,822 priority patent/US10797830B2/en
Ceased legal-status Critical Current

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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present invention relates to a broadcast signal transmission / reception technology used in a broadcast system, and more particularly, to a broadcast signal transmission / reception system for multiplexing / demultiplexing two or more signals to transmit / receive.
  • Bit-Interleaved Coded Modulation is a bandwidth-efficient transmission technology that includes an error-correction coder, a bit-by-bit interleaver, and a high-order modulator. In combined form.
  • BICM can provide excellent performance with a simple structure by using a low-density parity check (LDPC) encoder or a turbo encoder as an error correction encoder.
  • LDPC low-density parity check
  • turbo encoder a turbo encoder
  • BICM provides a high level of flexibility because it can select various modulation orders, error correction codes, lengths, and code rates. Because of these advantages, BICM is not only used in broadcasting standards such as DVB-T2 and DVB-NGH, but also in other next generation broadcasting systems.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • the signal multiplexing apparatus may further include an injection level controller which generates a power reduced enhanced layer signal by reducing the power of the enhanced layer signal.
  • the combiner may combine the core layer signal and the power reduced enhanced layer signal to generate a multiplexed signal.
  • the signal multiplexing apparatus includes a core layer BICM unit corresponding to the core layer signal; And an enhanced layer BICM unit that performs different BICM encoding from the core layer BICM unit.
  • the core layer BICM unit may have a lower bit rate than the enhanced layer BICM unit and the core layer BICM unit may be more robust than the enhanced layer BICM unit.
  • the power normalizer corresponds to a normalizing factor, and may lower the power of the multiplexed signal by the coupler.
  • the injection level controller may correspond to a scaling factor.
  • the normalizing factor and the scaling factor are each greater than 0 and less than 1, and the scaling factor decreases as the power reduction corresponding to the injection level controller increases, and the normalizing factor decreases the power corresponding to the injection level controller. May increase as
  • the injection level controller can change the injection level in 0.5dB steps from 3.0dB to 10.0dB.
  • the enhanced layer signal may correspond to the enhanced layer data, which is restored based on a cancellation corresponding to the restoration of the core layer data corresponding to the core layer signal.
  • the core layer BICM unit may include a core layer error correction encoder for error correction encoding the core layer data; A core layer bit interleaver for performing bit interleaving corresponding to the core layer data; And a core layer symbol mapper for performing modulation corresponding to the core layer data.
  • the enhanced layer BICM unit may include an enhanced layer error correction encoder configured to perform error correction encoding on the enhanced layer data; An enhanced layer bit interleaver for performing bit interleaving corresponding to the enhanced layer data; And an enhanced layer symbol mapper for performing modulation corresponding to the enhanced layer data.
  • the enhanced layer error correction encoder may have a higher code rate than the core layer error correction encoder, and the enhanced layer symbol mapper may be less robust than the core layer symbol mapper.
  • the combiner may combine one or more extension layer signals having a lower power level than the core layer signal and the enhanced layer signal together with the core layer signal and the enhanced layer signal.
  • the signal multiplexing method comprises the steps of combining the core layer signal and the enhanced layer signal at different power levels to generate a multiplexed signal; Lowering the power of the multiplexed signal to a power corresponding to the core layer signal; And performing interleaving applied to the core layer signal and the enhanced layer signal together.
  • the signal multiplexing method may further include generating a power reduced enhanced layer signal by reducing the power of the enhanced layer signal.
  • the combining may include combining the core layer signal and the power reduced enhanced layer signal to generate a multiplexed signal.
  • the step of lowering the power of the multiplexed signal may be lowered as much as it is increased by the step of combining the power of the multiplexed signal.
  • the generating of the power reduced enhanced layer signal may change the injection level at 0.5 dB intervals from 3.0 dB to 10.0 dB.
  • the combining may combine one or more extension layer signals of a lower power level than the core layer signal and the enhanced layer signal together with the core layer signal and the enhanced layer signal.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • the present invention can efficiently multiplex / demultiplex signals by combining each of two or more signals corresponding to each of the two or more layers to different power levels.
  • FIG. 1 is a block diagram illustrating a broadcast signal transmission / reception system according to an embodiment of the present invention.
  • FIG. 2 is a flowchart illustrating a broadcast signal transmission / reception method according to an embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating an example of the signal multiplexing apparatus illustrated in FIG. 1.
  • FIG. 4 is a block diagram illustrating another example of the signal multiplexing apparatus illustrated in FIG. 1.
  • FIG. 5 is a block diagram illustrating an example of the signal demultiplexing apparatus shown in FIG. 1.
  • FIG. 6 is a block diagram illustrating another example of the signal demultiplexing apparatus illustrated in FIG. 1.
  • FIG. 7 is a diagram illustrating a power increase due to a combination of a core layer signal and an enhanced layer signal.
  • FIG. 8 is a block diagram illustrating another example of the signal multiplexing apparatus of FIG. 1.
  • FIG. 9 is a block diagram illustrating another example of the signal multiplexing apparatus shown in FIG. 1.
  • FIG. 10 is a block diagram illustrating another example of the signal demultiplexing apparatus illustrated in FIG. 1.
  • FIG. 11 is a block diagram illustrating another example of the signal demultiplexing apparatus shown in FIG. 1.
  • FIG. 12 is a flowchart illustrating a signal multiplexing method according to an embodiment of the present invention.
  • FIG. 1 is a block diagram illustrating a broadcast signal transmission / reception system according to an embodiment of the present invention.
  • a broadcast signal transmission / reception system includes a broadcast signal transmission device 110, a wireless channel 120, and a broadcast signal reception device 130.
  • the broadcast signal transmission apparatus 110 includes a signal multiplexing apparatus 111 and an OFDM transmitter 113 for multiplexing core layer data and enhanced layer data.
  • the signal multiplexing device 111 combines the core layer signal corresponding to the core layer data and the enhanced layer signal corresponding to the enhanced layer data into different power levels, and combines the core layer signal and the enhanced layer signal with the core layer signal. Interleaving is applied together to generate a multiplexed signal.
  • the OFDM transmitter 113 transmits the multiplexed signal through the antenna 117 by using an OFDM communication scheme so that the transmitted OFDM signal is transmitted through the radio channel 120 through the antenna 137 of the broadcast signal receiving apparatus 130. To be received.
  • the broadcast signal receiving apparatus 130 includes an OFDM receiver 133 and a signal demultiplexing apparatus 131.
  • the OFDM receiver 133 receives the OFDM signal through synchronization, channel estimation, and equalization processes. do.
  • the signal demultiplexing apparatus 131 first recovers core layer data from a signal received through the OFDM receiver 133, and then restores enhanced layer data through cancellation corresponding to the recovered core layer data.
  • the broadcast signal transmission / reception system may multiplex / demultiplex one or more enhancement layer data in addition to core layer data and enhanced layer data.
  • the enhancement layer data may be multiplexed at a lower power level than the core layer data and the enhanced layer data.
  • the injection power level of the second extension layer is lower than the injection power level of the first extension layer
  • the injection power level of the third extension layer is lower than the injection power level of the second extension layer. Can be.
  • FIG. 2 is a flowchart illustrating a broadcast signal transmission / reception method according to an embodiment of the present invention.
  • the core layer signal and the enhanced layer signal are combined and multiplexed at different power levels (S210).
  • the broadcast signal transmission / reception method transmits the multiplexed signal by OFDM (S220).
  • the broadcast signal transmission / reception method receives the transmitted signal by OFDM (S230).
  • step S230 may perform synchronization, channel estimation, and equalization processes.
  • the broadcast signal transmission / reception method restores core layer data from the received signal (S240).
  • the broadcast signal transmission / reception method restores enhanced layer data through core layer signal cancellation (S250).
  • steps S240 and S250 illustrated in FIG. 2 may correspond to a demultiplexing operation corresponding to step S210.
  • FIG. 3 is a block diagram illustrating an example of the signal multiplexing apparatus illustrated in FIG. 1.
  • a signal multiplexing apparatus may include a core layer BICM unit 310, an enhanced layer BICM unit 320, an injection level controller 330, a combiner 340, and a time interleaver. 350).
  • a bit-interleaved coded modulation (BICM) device includes an error correction encoder, a bit interleaver, and a symbol mapper, and the core layer BICM unit 310 and the enhanced layer BICM unit 320 illustrated in FIG. It may include a correction encoder, a bit interleaver, and a symbol mapper.
  • BICM bit-interleaved coded modulation
  • the core layer data and the enhanced layer data pass through different BICM units and then merge through the combiner 340.
  • the core layer data passes through the core layer BICM unit 310, and the enhanced layer data passes through the enhanced layer BICM unit 320 and then is combined in the combiner 340 through the injection level controller 330.
  • the enhanced layer BICM unit 320 may perform different BICM encoding from the core layer BICM unit 310. That is, the enhanced layer BICM unit 320 may perform error correction encoding or symbol mapping corresponding to a higher bit rate than the core layer BICM unit 310. In addition, the enhanced layer BICM unit 320 may perform error correction encoding or symbol mapping that is less robust than the core layer BICM unit 310.
  • the core layer error correction encoder may have a lower bit rate than the enhanced layer error correction encoder.
  • the enhanced layer symbol mapper may be less robust than the core layer symbol mapper.
  • the combiner 340 may be regarded as combining the core layer signal and the enhanced layer signal at different power levels.
  • Core layer data uses low code rate forward error correction (FEC) codes for robust reception, while enhanced layer data uses high code rate FEC codes for high data rates. Can be.
  • FEC forward error correction
  • the core layer data may have a wider coverage area in the same reception environment as compared with the enhanced layer data.
  • the enhanced layer data passing through the enhanced layer BICM unit 320 is adjusted through the injection level controller 330 to be combined with the core layer data by the combiner 340.
  • the injection level controller 330 reduces the power of the enhanced layer signal to generate the power reduced enhanced layer signal.
  • the combiner 340 may be regarded as generating a multiplexed signal by combining the core layer signal and the power reduced enhanced layer signal.
  • the data combined by the combiner 340 passes through a time interleaver 350 to distribute the burst errors occurring in the channel, and then multi-path and Doppler. It is transmitted through a robust OFDM transmitter.
  • the time interleaver 350 performs interleaving applied to both the core layer signal and the enhanced layer signal. That is, since the core layer and the enhanced layer share the time interleaver, unnecessary memory usage can be prevented and latency at the receiver can be reduced.
  • the enhanced layer signal may correspond to enhanced layer data reconstructed based on a cancellation corresponding to reconstruction of core layer data corresponding to the core layer signal.
  • FIG. 4 is a block diagram illustrating another example of the signal multiplexing apparatus illustrated in FIG. 1.
  • the signal multiplexing apparatus multiplexes data corresponding to N extension layers with N (N is one or more natural numbers) in addition to core layer data and enhanced layer data.
  • the signal multiplexing apparatus illustrated in FIG. 4 includes N extension layers in addition to the core layer BICM unit 310, the enhanced layer BICM unit 320, the injection level controller 330, the combiner 340, and the time interleaver 350.
  • the core layer BICM unit 310, the enhanced layer BICM unit 320, the injection level controller 330, the combiner 340, and the time interleaver 350 illustrated in FIG. 4 have been described in detail with reference to FIG. 3. .
  • the N enhancement layer BICM units 410, ..., 430 independently perform BICM encoding, and the injection level controllers 440, ..., 460 perform power reducing corresponding to each enhancement layer.
  • the power reduced extended layer signal is combined with other layer signals through the combiner 340.
  • the power reduction corresponding to each of the injection level controllers 440,... 460 is preferably greater than the power reduction of the injection level controller 330. That is, the injection level controllers 330, 440,..., 460 illustrated in FIG. 4 may correspond to a large power reduction as it descends.
  • the power adjustment may be to increase or decrease the power of the input signal, or may be to increase or decrease the gain of the input signal.
  • the time interleaver 350 performs interleaving on signals combined by the combiner 340, thereby interleaving the signals of the layers.
  • FIG. 5 is a block diagram illustrating an example of the signal demultiplexing apparatus shown in FIG. 1.
  • the signal demultiplexing apparatus includes a time deinterleaver 510, a core layer BICM decoder 520, an enhanced layer symbol extractor 530, and an enhanced layer BICM decoder 540. ).
  • the signal demultiplexing apparatus illustrated in FIG. 5 may correspond to the signal multiplexing apparatus illustrated in FIG. 3.
  • the time deinterleaver 510 receives a received signal from an OFDM receiver that performs operations such as synchronization, channel estimation, and equalization, and relates to distribution of burst errors occurring in a channel. Perform the action.
  • the output of the time deinterleaver 510 is provided to the core layer BICM decoder 520, and the core layer BICM decoder 520 restores the core layer data.
  • the core layer BICM decoder 520 includes a core layer symbol demapper, a core layer bit deinterleaver, and a core layer error correction decoder.
  • the core layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the symbol
  • the core layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error
  • the core layer error correction decoder Correct is the core layer error correction decoder Correct.
  • the core layer error correction decoder may output only information bits, or may output all bits in which information bits and parity bits are combined.
  • the core layer error correction decoder may output only information bits as core layer data, and output all bits in which parity bits are combined to the enhanced layer symbol extractor 530.
  • the enhanced layer symbol extractor 530 receives the entire bits from the core layer error correction decoder of the core layer BICM decoder 520 and extracts the enhanced layer symbols from the output signal of the time deinterleaver 510.
  • the enhanced layer symbol extractor 530 includes a buffer, a subtracter, a core layer symbol mapper, and a core layer bit interleaver.
  • the buffer stores the output signal of the time deinterleaver 510.
  • the core layer bit interleaver receives the entire bits (information bits + parity bits) of the core layer BICM decoder and performs the same core layer bit interleaving as the transmitter.
  • the core layer symbol mapper generates the same core layer symbol as the transmitter from the interleaved signal.
  • the subtractor subtracts the output signal of the core layer symbol mapper from the signal stored in the buffer, thereby obtaining the enhanced layer symbol and passing it to the enhanced layer BICM decoder 540.
  • the core layer bit interleaver and the core layer symbol mapper included in the enhanced layer symbol extractor 530 may be the same as the bit interleaver and symbol mapper of the core layer illustrated in FIG. 3.
  • the enhanced layer BICM decoder 540 receives the enhanced layer symbol and restores the enhanced layer data.
  • the enhanced layer BICM decoder 540 may include an enhanced layer symbol demapper, an enhanced layer bit deinterleaver, and an enhanced layer error correction decoder.
  • the enhanced layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the enhanced layer symbol
  • the enhanced layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error and decrypts the enhanced layer error correction.
  • the device corrects errors that occur in the channel.
  • the apparatus for demultiplexing the signal shown in FIG. 5 first recovers the core layer data, cancels the core layer symbols from the received signal symbol, and restores the enhanced layer data after leaving only the enhanced layer symbols.
  • the data having the lowest error may be recovered only from the signal having the strongest power.
  • FIG. 6 is a block diagram illustrating another example of the signal demultiplexing apparatus illustrated in FIG. 1.
  • a signal demultiplexing apparatus includes a time deinterleaver 510, a core layer BICM decoder 520, an enhanced layer symbol extractor 530, and an enhanced layer BICM decoder 540. ), One or more enhancement layer symbol extractors 650, 670 and one or more enhancement layer BICM decoders 660, 680.
  • the signal demultiplexing apparatus illustrated in FIG. 6 may correspond to the signal multiplexing apparatus illustrated in FIG. 4.
  • the time deinterleaver 510 receives a received signal from an OFDM receiver that performs operations such as synchronization, channel estimation, and equalization, and relates to distribution of burst errors occurring in a channel. Perform the action.
  • the output of the time deinterleaver 510 is provided to the core layer BICM decoder 520, and the core layer BICM decoder 520 restores the core layer data.
  • the core layer BICM decoder 520 includes a core layer symbol demapper, a core layer bit deinterleaver, and a core layer error correction decoder.
  • the core layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the symbol
  • the core layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error
  • the core layer error correction decoder Correct is the core layer error correction decoder Correct.
  • the core layer error correction decoder may output only information bits, or may output all bits in which information bits and parity bits are combined.
  • the core layer error correction decoder may output only information bits as core layer data, and output all bits in which parity bits are combined to the enhanced layer symbol extractor 530.
  • the enhanced layer symbol extractor 530 receives the entire bits from the core layer error correction decoder of the core layer BICM decoder 520 and extracts the enhanced layer symbols from the output signal of the time deinterleaver 510.
  • the enhanced layer symbol extractor 530 includes a buffer, a subtracter, a core layer symbol mapper, and a core layer bit interleaver.
  • the buffer stores the output signal of the time deinterleaver 510.
  • the core layer bit interleaver receives the entire bits (information bits + parity bits) of the core layer BICM decoder and performs the same core layer bit interleaving as the transmitter.
  • the core layer symbol mapper generates the same core layer symbol as the transmitter from the interleaved signal.
  • the subtractor subtracts the output signal of the core layer symbol mapper from the signal stored in the buffer, thereby obtaining the enhanced layer symbol and passing it to the enhanced layer BICM decoder 540.
  • the core layer bit interleaver and the core layer symbol mapper included in the enhanced layer symbol extractor 530 may be the same as the bit interleaver and symbol mapper of the core layer illustrated in FIG. 4.
  • the enhanced layer BICM decoder 540 receives the enhanced layer symbol and restores the enhanced layer data.
  • the enhanced layer BICM decoder 540 may include an enhanced layer symbol demapper, an enhanced layer bit deinterleaver, and an enhanced layer error correction decoder.
  • the enhanced layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the enhanced layer symbol
  • the enhanced layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error and decrypts the enhanced layer error correction.
  • the device corrects errors that occur in the channel.
  • the enhanced layer error correction decoder may output only information bits, or may output all bits in which information bits and parity bits are combined.
  • the enhanced layer error correction decoder may output only information bits as enhanced layer data, and output all bits in which the parity bits are combined with the information bits to the enhancement layer symbol extractor 650.
  • the enhancement layer symbol extractor 650 receives the entire bits from the enhanced layer error correction decoder of the enhanced layer BICM decoder 540 and extends the extension layer symbol from the output signal of the subtractor of the enhanced layer symbol extractor 530. Extract them.
  • the enhancement layer symbol extractor 650 includes a buffer, a subtracter, an enhanced layer symbol mapper, and an enhanced layer bit interleaver.
  • the buffer stores the output signal of the subtractor of the enhanced layer symbol extractor.
  • the enhanced layer bit interleaver receives the entire bits (information bits + parity bits) of the enhanced layer BICM decoder and performs the same enhanced layer bit interleaving as the transmitter.
  • the enhanced layer symbol mapper generates the same enhanced layer symbol as the transmitter from the interleaved signal.
  • the subtractor subtracts the output signal of the enhanced layer symbol mapper from the signal stored in the buffer, thereby obtaining the enhancement layer symbol and passing it to the enhancement layer BICM decoder 660.
  • the enhanced layer bit interleaver and the enhanced layer symbol mapper included in the enhancement layer symbol extractor 650 may be the same as the bit interleaver and the symbol mapper of the enhanced layer shown in FIG. 4.
  • the enhancement layer BICM decoder 660 receives the enhancement layer symbol and restores the enhancement layer data.
  • the enhancement layer BICM decoder 660 may include an enhancement layer symbol demapper, an enhancement layer bit deinterleaver, and an enhancement layer error correction decoder.
  • the enhancement layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the enhancement layer symbol
  • the enhancement layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error
  • LLR Log-Likelihood Ratio
  • two or more enhancement layer symbol extractors and enhancement layer BICM decoders may be provided when there are two or more enhancement layers.
  • the enhancement layer error correction decoder of the enhancement layer BICM decoder 660 may output only information bits and output all bits in which the information bits and the parity bits are combined. It may be.
  • the enhancement layer error correction decoder may output only information bits as enhancement layer data, and output all bits in which parity bits are combined with the information bits to the next enhancement layer symbol extractor 670.
  • the structure and operation of the enhancement layer symbol extractor 670 and the enhancement layer BICM decoder 680 can be easily understood from the structures and operations of the enhancement layer symbol extractor 650 and the enhancement layer BICM decoder 660 described above.
  • the signal demultiplexing apparatus illustrated in FIG. 6 first restores core layer data, restores enhanced layer data using cancellation of the core layer symbols, and extends the extended layer data using cancellation of the enhanced layer symbols. It can be seen that the restoration. Two or more enhancement layers may be provided, in which case they are restored from the combined enhancement layers at higher power levels.
  • the signal multiplexing apparatus shown in FIGS. 3 and 4 is essentially combining two or more signals at different power levels, it may be necessary to adjust the power level after the combining. That is, when combining the core layer signal and the enhanced layer signal by the combiner, the power of the combined multiplexing signal may have a higher power level than the core layer signal or the enhanced layer signal before combining. Problems such as distortion of the signal due to the same power increase may occur.
  • FIG. 7 is a diagram illustrating a power increase due to a combination of a core layer signal and an enhanced layer signal.
  • the power level of the multiplexed signal is determined by the core layer signal or the enhanced layer signal. It can be seen that the power level is higher.
  • the injection level controlled by the injection level controller shown in FIGS. 3 and 4 may be adjusted in 0.5dB steps from 3.0dB to 10.0dB.
  • the power of the enhanced layer signal is 3dB lower than the power of the core layer signal.
  • the power of the enhanced layer signal is 10 dB lower than the power of the core layer signal. This relationship may be applied not only between the core layer signal and the enhanced layer signal but also between the enhanced layer signal and the enhancement layer signal or the enhancement layer signals.
  • FIG. 8 is a block diagram illustrating another example of the signal multiplexing apparatus of FIG. 1.
  • the signal multiplexing apparatus includes a core layer BICM unit 310, an enhanced layer BICM unit 320, an injection level controller 330, a combiner 340, and a power normalizer. 810 and a time interleaver 350.
  • a bit-interleaved coded modulation (BICM) device includes an error correction encoder, a bit interleaver, and a symbol mapper, and the core layer BICM unit 310 and the enhanced layer BICM unit 320 illustrated in FIG. It may include a correction encoder, a bit interleaver, and a symbol mapper.
  • BICM bit-interleaved coded modulation
  • the core layer data and the enhanced layer data pass through different BICM units and then merge through the combiner 340.
  • the core layer data passes through the core layer BICM unit 310, and the enhanced layer data passes through the enhanced layer BICM unit 320 and then is combined in the combiner 340 through the injection level controller 330.
  • the enhanced layer BICM unit 320 may perform different BICM encoding from the core layer BICM unit 310. That is, the enhanced layer BICM unit 320 may perform error correction code or symbol mapping corresponding to a higher bit rate than the core layer BICM unit 310. In addition, the enhanced layer BICM unit 320 may perform error correction code or symbol mapping that is less robust than the core layer BICM unit 310.
  • the core layer error correction encoder may have a lower bit rate than the enhanced layer error correction encoder.
  • the enhanced layer symbol mapper may be less robust than the core layer symbol mapper.
  • the combiner 340 may be regarded as combining the core layer signal and the enhanced layer signal at different power levels.
  • Core layer data uses low code rate forward error correction (FEC) codes for robust reception, while enhanced layer data uses high code rate FEC codes for high data rates. Can be.
  • FEC forward error correction
  • the core layer data may have a wider coverage area in the same reception environment as compared with the enhanced layer data.
  • the enhanced layer data passing through the enhanced layer BICM unit 320 is adjusted through the injection level controller 330 to be combined with the core layer data by the combiner 340.
  • the injection level controller 330 reduces the power of the enhanced layer signal to generate the power reduced enhanced layer signal.
  • the injection level controller 330 may adjust the injection power level in 0.5dB steps from 3.0dB to 10.0dB.
  • the combiner 340 may be regarded as generating a multiplexed signal by combining the core layer signal and the power reduced enhanced layer signal.
  • the signal coupled by the combiner 340 is provided to the power normalizer 810 to lower the power by the power increase generated by the combination of the core layer signal and the enhanced layer signal to perform power adjustment. That is, the power normalizer 810 lowers the power of the signal multiplexed by the combiner 340 to a power level corresponding to the core layer signal. Since the level of the combined signal is higher than the level of one layer signal, power normalization of the power normalizer 810 is necessary to prevent amplitude clipping and the like in the rest of the broadcast signal transmission / reception system.
  • the combined signal is It can be expressed as
  • ⁇ represents a scaling factor corresponding to various injection levels. That is, the injection level controller 330 may correspond to a scaling factor.
  • the combined signal It can be expressed as
  • the power normalizer 810 Since the power of the combined signal (multiplexed signal) has increased compared to the core layer signal, the power normalizer 810 must mitigate this power increase.
  • the output of the power normalizer 810 is It can be expressed as
  • ⁇ represents a normalizing factor according to various injection levels of the enhanced layer.
  • the output of the power normalizer 810 is It can be expressed as
  • Table 1 below shows scaling factors ⁇ and normalizing factors ⁇ according to various injection levels (CL: Core Layer, EL: Enhanced Layer).
  • the power normalizer 810 corresponds to a normalizing factor and may be viewed as lowering the power of the multiplexed signal by the combiner 340.
  • the normalizing factor and the scaling factor may be rational numbers larger than 0 and smaller than 1, respectively.
  • the scaling factor may decrease as the power reduction corresponding to the injection level controller 330 increases, and the normalizing factor may increase as the power reduction corresponding to the injection level controller 330 increases.
  • the power normalized signal passes through a time interleaver 350 for distributing burst errors occurring in the channel, and then uses an OFDM transmitter that is robust to multipath and Doppler. Is sent over.
  • the time interleaver 350 performs interleaving applied to both the core layer signal and the enhanced layer signal. That is, since the core layer and the enhanced layer share the time interleaver, unnecessary memory usage can be prevented and latency at the receiver can be reduced.
  • the enhanced layer signal may correspond to enhanced layer data reconstructed based on cancellation corresponding to reconstruction of core layer data corresponding to the core layer signal, and the combiner 340 may correspond to the core layer.
  • One or more extension layer signals of a lower power level than the signal and enhanced layer signal may be combined with the core layer signal and the enhanced layer signal.
  • FIG. 9 is a block diagram illustrating another example of the signal multiplexing apparatus shown in FIG. 1.
  • the signal multiplexing apparatus multiplexes data corresponding to N extension layers with N (N is a natural number of 1 or more) in addition to core layer data and enhanced layer data.
  • the signal multiplexing apparatus illustrated in FIG. 9 includes a core layer BICM unit 310, an enhanced layer BICM unit 320, an injection level controller 330, a combiner 340, a power normalizer 810, and a time interleaver ( In addition to 350, the N enhancement layer BICM units 410,..., 430, and injection level controllers 440,..., 460 are included.
  • the core layer BICM unit 310, the enhanced layer BICM unit 320, the injection level controller 330, the combiner 340, and the time interleaver 350 illustrated in FIG. 9 have been described in detail with reference to FIG. 3. .
  • the N enhancement layer BICM units 410, ..., 430 independently perform BICM encoding, and the injection level controllers 440, ..., 460 perform power reducing corresponding to each enhancement layer.
  • the power reduced extended layer signal is combined with other layer signals through the combiner 340.
  • the power reduction corresponding to each of the injection level controllers 440,... 460 is preferably greater than the power reduction of the injection level controller 330. That is, the injection level controllers 330, 440,..., 460 illustrated in FIG. 9 may correspond to a large power reduction as it descends.
  • the power adjustment may be to increase or decrease the power of the input signal, or may be to increase or decrease the gain of the input signal.
  • the power normalizer 810 mitigates the power increase caused by combining the plurality of layer signals by the combiner 340.
  • the time interleaver 350 performs interleaving on signals of the layers by interleaving the normalized signal.
  • FIG. 10 is a block diagram illustrating another example of the signal demultiplexing apparatus illustrated in FIG. 1.
  • the signal demultiplexing apparatus includes a time deinterleaver 510, a de-normalizer 1010, a core layer BICM decoder 520, and an enhanced layer symbol extractor 530.
  • the signal demultiplexing apparatus illustrated in FIG. 10 may correspond to the signal multiplexing apparatus illustrated in FIG. 8.
  • the time deinterleaver 510 receives a received signal from an OFDM receiver that performs operations such as synchronization, channel estimation, and equalization, and relates to distribution of burst errors occurring in a channel. Perform the action.
  • the de-normalizer 1010 corresponds to the power normalizer of the transmitter, increasing power by a decrease in the power normalizer.
  • the de-normalizer 1010 is shown to adjust the power of the output signal of the time interleaver 510, but according to an embodiment the de-normalizer 1010 may be a time interleaver 510. It can also be placed in front of to allow power adjustment to be performed before interleaving.
  • the de-normalizer 1010 may be located in front of or behind the time interleaver 510 to amplify the signal size for LLR calculation of the core layer symbol demapper.
  • the output of the time deinterleaver 510 (or the output of the de-normalizer 1010) is provided to the core layer BICM decoder 520, and the core layer BICM decoder 520 restores the core layer data.
  • the core layer BICM decoder 520 includes a core layer symbol demapper, a core layer bit deinterleaver, and a core layer error correction decoder.
  • the core layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the symbol
  • the core layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error
  • the core layer error correction decoder Correct is the core layer error correction decoder Correct.
  • the core layer error correction decoder may output only information bits, or may output all bits in which information bits and parity bits are combined.
  • the core layer error correction decoder may output only information bits as core layer data, and output all bits in which parity bits are combined to the enhanced layer symbol extractor 530.
  • the enhanced layer symbol extractor 530 receives the entire bits from the core layer error correction decoder of the core layer BICM decoder 520 and extracts the enhanced layer symbols from the output signal of the time deinterleaver 510.
  • the enhanced layer symbol extractor 530 includes a buffer, a subtracter, a core layer symbol mapper, and a core layer bit interleaver.
  • the buffer stores the output signal of the time deinterleaver 510 or de-normalizer 1010.
  • the core layer bit interleaver receives the entire bits (information bits + parity bits) of the core layer BICM decoder and performs the same core layer bit interleaving as the transmitter.
  • the core layer symbol mapper generates the same core layer symbol as the transmitter from the interleaved signal.
  • the subtractor subtracts the output signal of the core layer symbol mapper from the signal stored in the buffer, thereby obtaining the enhanced layer symbol and passing it to the de-injection level controller 1020.
  • the core layer bit interleaver and the core layer symbol mapper included in the enhanced layer symbol extractor 530 may be the same as the bit interleaver and symbol mapper of the core layer illustrated in FIG. 8.
  • the de-injection level controller 1020 receives the enhanced layer symbol and increases the power by the power dropped by the injection level controller of the transmitter. That is, the de-injection level controller 1020 amplifies the input signal and provides the amplified signal to the enhanced layer BICM decoder 540. For example, if the transmitter combines the power of the enhanced layer signal by 3 dB less than the power of the core layer signal, the de-injection level controller 1020 serves to increase the power of the input signal by 3 dB.
  • the enhanced layer BICM decoder 540 receives the enhanced layer symbol whose power is increased by the de-injection level controller 1020 and restores the enhanced layer data.
  • the enhanced layer BICM decoder 540 may include an enhanced layer symbol demapper, an enhanced layer bit deinterleaver, and an enhanced layer error correction decoder.
  • the enhanced layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the enhanced layer symbol
  • the enhanced layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error and decrypts the enhanced layer error correction.
  • the device corrects errors that occur in the channel.
  • the signal demultiplexing apparatus shown in FIG. 10 first restores the core layer data, cancels the core layer symbols from the received signal symbol to leave only the enhanced layer symbols, and then increases the power of the enhanced layer symbol. To restore the enhanced layer data.
  • FIG. 11 is a block diagram illustrating another example of the signal demultiplexing apparatus shown in FIG. 1.
  • a signal demultiplexing apparatus includes a time deinterleaver 510, a de-normalizer 1010, a core layer BICM decoder 520, and an enhanced layer symbol extractor 530.
  • the signal demultiplexing apparatus illustrated in FIG. 11 may correspond to the signal multiplexing apparatus illustrated in FIG. 9.
  • the time deinterleaver 510 receives a received signal from an OFDM receiver that performs operations such as synchronization, channel estimation, and equalization, and relates to distribution of burst errors occurring in a channel. Perform the action.
  • the de-normalizer 1010 corresponds to the power normalizer of the transmitter, increasing power by a decrease in the power normalizer.
  • the de-normalizer 1010 is shown to adjust the power of the output signal of the time interleaver 510, but according to an embodiment the de-normalizer 1010 may be a time interleaver 510. It can also be placed in front of to allow power adjustment to be performed before interleaving.
  • the de-normalizer 1010 may be located in front of or behind the time interleaver 510 to amplify the signal size for LLR calculation of the core layer symbol demapper.
  • the output of the time deinterleaver 510 (or the output of the de-normalizer 1010) is provided to the core layer BICM decoder 520, and the core layer BICM decoder 520 restores the core layer data.
  • the core layer BICM decoder 520 includes a core layer symbol demapper, a core layer bit deinterleaver, and a core layer error correction decoder.
  • the core layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the symbol
  • the core layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error
  • the core layer error correction decoder Correct is the core layer error correction decoder Correct.
  • the core layer error correction decoder may output only information bits, or may output all bits in which information bits and parity bits are combined.
  • the core layer error correction decoder may output only information bits as core layer data, and output all bits in which parity bits are combined to the enhanced layer symbol extractor 530.
  • the enhanced layer symbol extractor 530 receives the entire bits from the core layer error correction decoder of the core layer BICM decoder 520 and extracts the enhanced layer symbols from the output signal of the time deinterleaver 510.
  • the enhanced layer symbol extractor 530 includes a buffer, a subtracter, a core layer symbol mapper, and a core layer bit interleaver.
  • the buffer stores the output signal of the time deinterleaver 510 or de-normalizer 1010.
  • the core layer bit interleaver receives the entire bits (information bits + parity bits) of the core layer BICM decoder and performs the same core layer bit interleaving as the transmitter.
  • the core layer symbol mapper generates the same core layer symbol as the transmitter from the interleaved signal.
  • the subtractor subtracts the output signal of the core layer symbol mapper from the signal stored in the buffer, thereby obtaining the enhanced layer symbol and passing it to the de-injection level controller 1020.
  • the core layer bit interleaver and the core layer symbol mapper included in the enhanced layer symbol extractor 530 may be the same as the bit interleaver and symbol mapper of the core layer illustrated in FIG. 9.
  • the de-injection level controller 1020 receives the enhanced layer symbol and increases the power by the power dropped by the injection level controller of the transmitter. That is, the de-injection level controller 1020 amplifies the input signal and provides the amplified signal to the enhanced layer BICM decoder 540.
  • the enhanced layer BICM decoder 540 receives the enhanced layer symbol whose power is increased by the de-injection level controller 1020 and restores the enhanced layer data.
  • the enhanced layer BICM decoder 540 may include an enhanced layer symbol demapper, an enhanced layer bit deinterleaver, and an enhanced layer error correction decoder.
  • the enhanced layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the enhanced layer symbol
  • the enhanced layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error and decrypts the enhanced layer error correction.
  • the device corrects errors that occur in the channel.
  • the enhanced layer error correction decoder may output only information bits, or may output all bits in which information bits and parity bits are combined.
  • the enhanced layer error correction decoder may output only information bits as enhanced layer data, and output all bits in which the parity bits are combined with the information bits to the enhancement layer symbol extractor 650.
  • the enhancement layer symbol extractor 650 receives the entire bits from the enhanced layer error correction decoder of the enhanced layer BICM decoder 540 and extracts extension layer symbols from the output signal of the de-injection level controller 1020. do.
  • the de-injection level controller 1020 may amplify the power of the output signal of the subtractor of the enhanced layer symbol extractor 530.
  • the enhancement layer symbol extractor 650 includes a buffer, a subtracter, an enhanced layer symbol mapper, and an enhanced layer bit interleaver.
  • the buffer stores the output signal of the de-injection level controller 1020.
  • the enhanced layer bit interleaver receives the entire bits (information bits + parity bits) of the enhanced layer BICM decoder and performs the same enhanced layer bit interleaving as the transmitter.
  • the enhanced layer symbol mapper generates the same enhanced layer symbol as the transmitter from the interleaved signal.
  • the subtractor subtracts the output signal of the enhanced layer symbol mapper from the signal stored in the buffer, thereby obtaining the enhancement layer symbol and delivering it to the de-injection level controller 1150.
  • the enhanced layer bit interleaver and the enhanced layer symbol mapper included in the enhancement layer symbol extractor 650 may be the same as the bit interleaver and symbol mapper of the enhanced layer illustrated in FIG. 9.
  • the de-injection level controller 1150 increases the power by the injection level controller of the layer at the transmitter.
  • the enhancement layer BICM decoder 660 receives the enhancement layer symbol whose power is increased by the de-injection level controller 1150 and restores the enhancement layer data.
  • the enhancement layer BICM decoder 660 may include an enhancement layer symbol demapper, an enhancement layer bit deinterleaver, and an enhancement layer error correction decoder.
  • the enhancement layer symbol demapper calculates the Log-Likelihood Ratio (LLR) values associated with the enhancement layer symbol
  • the enhancement layer bit deinterleaver strongly mixes the calculated LLR values with the clustering error
  • LLR Log-Likelihood Ratio
  • two or more enhancement layer symbol extractors and enhancement layer BICM decoders may be provided when there are two or more enhancement layers.
  • the enhancement layer error correction decoder of the enhancement layer BICM decoder 660 may output only information bits and output all bits in which the information bits and the parity bits are combined. It may be.
  • the enhancement layer error correction decoder may output only information bits as enhancement layer data, and output all bits in which parity bits are combined with the information bits to the next enhancement layer symbol extractor 670.
  • the structure and operation of the enhancement layer symbol extractor 670, the enhancement layer BICM decoder 680, and the de-injection level controller 1170 are described in detail above with the enhancement layer symbol extractor 650, the enhancement layer BICM decoder 660 and de-injection. It can be easily seen from the structure and operation of the level controller 1150.
  • the de-injection level controllers 1020, 1150, and 1170 shown in FIG. 11 may correspond to a greater power rise as it goes down. That is, the de-injection level controller 1150 increases power more than the de-injection level controller 1020, and the de-injection level controller 1170 increases the power more significantly than the de-injection level controller 1150. You can.
  • the signal demultiplexing apparatus illustrated in FIG. 11 first restores core layer data, restores enhanced layer data using cancellation of core layer symbols, and extends extended layer data using cancellation of enhanced layer symbols. It can be seen that the restoration. Two or more enhancement layers may be provided, in which case they are restored from the combined enhancement layers at higher power levels.
  • FIG. 12 is a flowchart illustrating a signal multiplexing method according to an embodiment of the present invention.
  • BICM is applied to core layer data (S1210).
  • BICM is applied to enhanced layer data (S1220).
  • the BICM applied at step S1220 and the BICM applied at step S1210 may be different. At this time, the BICM applied in step S1220 may be less robust than the BICM applied in step S1210. At this time, the bit rate of the BICM applied in step S1220 may be greater than the bit rate applied in step S1210.
  • the enhanced layer signal may correspond to enhanced layer data reconstructed based on a cancellation corresponding to reconstruction of core layer data corresponding to the core layer signal.
  • the signal multiplexing method generates a power reduced enhanced layer signal by reducing the power of the enhanced layer signal (S1230).
  • step S1230 may change the injection level in 0.5 dB intervals between 3.0 dB and 10.0 dB.
  • the signal multiplexing method combines the core layer signal and the power reduced enhanced layer signal to generate a multiplexed signal (S1240).
  • step S1240 the core layer signal and the enhanced layer signal are combined at different power levels, but the power layer of the enhanced layer signal is combined to be lower than the power level of the core layer signal.
  • one or more extension layer signals having a lower power level than the core layer signal and the enhanced layer signal may be combined with the core layer signal and the enhanced layer signal.
  • the signal multiplexing method according to an embodiment of the present invention lowers the power of the signal multiplexed by the step S1250 (S1250).
  • step S1250 may lower the power of the multiplexed signal by the power of the core layer signal. In this case, step S1250 may lower the power of the multiplexed signal as much as it is increased by step S1240.
  • the signal multiplexing method performs interleaving applied to both the core layer signal and the enhanced layer signal (S1260).
  • the signal multiplexing method illustrated in FIG. 12 may correspond to the steps S240 and S250 illustrated in FIG. 2.
  • the apparatus and method for signal multiplexing according to the present invention may not be limitedly applied to the configuration and method of the embodiments described as described above. Or some may be selectively combined.

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Abstract

La présente invention concerne un appareil de multiplexage de signaux recourant au multiplexage par répartition en couches et un procédé de multiplexage de signaux. Selon un mode de réalisation de la présente invention, un procédé de multiplexage de signaux fait appel à : un combineur destiné à générer un signal multiplexé par combinaison d'un signal de couche centrale et d'un signal de couche améliorée à des niveaux de puissance différents ; un organe de normalisation de puissance destiné à abaisser le niveau de puissance du signal multiplexé à un niveau de puissance correspondant au niveau de puissance du signal de couche centrale ; et un entrelaceur temporel destiné à effectuer l'entrelacement appliqué à la fois au signal de couche centrale et au signal de couche améliorée.
PCT/KR2015/001832 2014-05-09 2015-02-25 Appareil de multiplexage de signaux recourant au multiplexage par répartition en couches et procédé de multiplexage de signaux Ceased WO2015170819A1 (fr)

Priority Applications (13)

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EP20202101.0A EP3800851B1 (fr) 2014-05-09 2015-02-25 Appareil de multiplexage de signal utilisant le multiplexage par répartition en couches et procédé de multiplexage de signal
US15/124,646 US10164740B2 (en) 2014-05-09 2015-02-25 Signal multiplexing apparatus using layered division multiplexing and signal multiplexing method
MX2018008368A MX389689B (es) 2014-05-09 2015-02-25 Aparato de multiplexion de señal usando multiplexion por division en capas y metodo de multiplexion de señal.
MX2016012661A MX357430B (es) 2014-05-09 2015-02-25 Aparato de multiplexion de señal usando multiplexion por division en capas y metodos de multiplexion de señal.
CN201911250635.6A CN110971346B (zh) 2014-05-09 2015-02-25 使用分层划分多路复用的信号多路复用设备和方法
CA2942287A CA2942287C (fr) 2014-05-09 2015-02-25 Appareil de multiplexage de signaux recourant au multiplexage par repartition en couches et procede de multiplexage de signaux
EP15789406.4A EP3142313B1 (fr) 2014-05-09 2015-02-25 Appareil de multiplexage de signaux recourant au multiplexage par répartition en couches et procédé de multiplexage de signaux
CN201580019420.7A CN106170960B (zh) 2014-05-09 2015-02-25 使用分层划分多路复用的信号多路复用设备和信号多路复用方法
JP2016562259A JP6794262B2 (ja) 2014-05-09 2015-02-25 レイヤードディビジョンマルチプレキシングを利用した信号マルチプレキシング装置および信号マルチプレキシング方法
EP25158568.3A EP4546674A3 (fr) 2014-05-09 2015-02-25 Appareil de multiplexage de signaux utilisant un multiplexage par répartition en couches et procédé de multiplexage de signaux
US16/182,419 US10404414B2 (en) 2014-05-09 2018-11-06 Signal multiplexing apparatus using layered division multiplexing and signal multiplexing method
US16/515,760 US10601548B2 (en) 2014-05-09 2019-07-18 Signal multiplexing apparatus using layered division multiplexing and signal multiplexing method
US16/791,822 US10797830B2 (en) 2014-05-09 2020-02-14 Signal multiplexing apparatus using layered division multiplexing and signal multiplexing method

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KR10-2015-0026288 2015-02-25
KR1020150026288A KR102316272B1 (ko) 2014-05-09 2015-02-25 레이어드 디비전 멀티플렉싱을 이용한 신호 멀티플렉싱 장치 및 신호 멀티플렉싱 방법

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US16/182,419 Continuation US10404414B2 (en) 2014-05-09 2018-11-06 Signal multiplexing apparatus using layered division multiplexing and signal multiplexing method

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