WO2020256164A1 - Procédé et appareil permettant d'effectuer un codage sur la base d'une matrice de contrôle de parité d'un code de contrôle de parité à faible densité dans un système de communication sans fil - Google Patents

Procédé et appareil permettant d'effectuer un codage sur la base d'une matrice de contrôle de parité d'un code de contrôle de parité à faible densité dans un système de communication sans fil Download PDF

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Publication number
WO2020256164A1
WO2020256164A1 PCT/KR2019/007270 KR2019007270W WO2020256164A1 WO 2020256164 A1 WO2020256164 A1 WO 2020256164A1 KR 2019007270 W KR2019007270 W KR 2019007270W WO 2020256164 A1 WO2020256164 A1 WO 2020256164A1
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sequence
data
reference signal
parity
bits
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PCT/KR2019/007270
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English (en)
Korean (ko)
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전기준
이상림
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엘지전자 주식회사
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Priority to PCT/KR2019/007270 priority Critical patent/WO2020256164A1/fr
Publication of WO2020256164A1 publication Critical patent/WO2020256164A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • 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

Definitions

  • the present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for performing encoding based on a parity check matrix of a low density parity check code in a wireless communication system.
  • LDPC code Low density parity check code
  • iterative decoding algorithm was introduced in 1962 by Gallagher, and rediscovered in 1996 by MacKay and Neal. Became.
  • the LDPC code is a linear error correction code, used in a noise transmission channel, and is also called a linear block code. Based on a bipartite graph, an LDPC code can be designed.
  • the LDPC code may be referred to as a capacity access code in terms of providing performance close to the theoretical limit (Shannon limit), using iterative soft-decision algorithms.
  • 3GPP LTE, LTE-A, and LTE-A pro use a capacity access code called a turbo code. It is known that the LDPC code has a bit error rate (BER) approaching the new null limit in a binary additional white Gaussian noisy channel (Binary AWGN channel).
  • BER bit error rate
  • Boundary AWGN channel binary additional white Gaussian noisy channel
  • 3GPP TS 38.212 which is a 5G (fifth generation)/NR (New radio) technology standard
  • transport channels such as uplink shared channel (UL-SCH), downlink shared channel (DL-SCH), and paging channel (PCH)
  • TrCH transport channels
  • UL-SCH uplink shared channel
  • DL-SCH downlink shared channel
  • PCH paging channel
  • the LDPC coding method was adopted as the channel coding method.
  • LDPC coding can be used in URLLC (ultra-reliable and low-latency communication), which is one of the 5G use cases.
  • URLLC ultra-reliable and low-latency communication
  • the present disclosure can provide an efficient LDPC coding method in a wireless communication system.
  • the present disclosure may provide a method and apparatus for performing encoding based on a parity check matrix of an LDPC code.
  • the present disclosure provides a method and apparatus for encoding and decoding by utilizing a pilot sequence used for channel estimation in a coding chain.
  • a method of performing low density parity check (LDPC) coding of a transmitter in a wireless communication system includes: attaching a reference signal sequence to data; Encoding the data to which the reference signal sequence is attached using a parity check matrix (PCM) of the LDPC coding; Obtaining a codeword from the encoded data, the codeword not including the reference signal sequence; And mapping the reference signal sequence and the codeword to resources and transmitting the same.
  • PCM parity check matrix
  • Attaching the reference signal sequence to the data includes: dividing the data into a plurality of code blocks; And attaching the reference signal sequence to at least one code block among the plurality of code blocks.
  • the encoded data includes an information part sequence of N bits and a parity part sequence of P bits, N is the number of columns of the information part of the PCM, P is the number of columns of the parity part of the PCM, and the information part sequence
  • N is the number of columns of the information part of the PCM
  • P is the number of columns of the parity part of the PCM
  • the information part sequence The rest of the data and the reference signal sequence except for the data and the reference signal sequence are shortened and not transmitted, and the parity bit sequence is composed of a first parity sequence and a second parity sequence, and the second parity sequence may not be transmitted.
  • the codeword may include the data and the first parity sequence.
  • the rest of the information partial sequence excluding the data and the reference signal sequence may consist of only some bits of the data.
  • the first parity sequence and the second parity sequence are generated based on the PCM, and the length of the second parity sequence is based on a length of the information partial sequence excluding the data and the reference signal sequence. Can be determined.
  • the rest of the information partial sequence excluding the data and the reference signal sequence may be composed of only zero bits.
  • a transmitter for performing low density parity check (LDPC) coding in a wireless communication system includes: a memory connected to a processor; And the processor, wherein the processor attaches a reference signal sequence to data, and encodes the data to which the reference signal sequence is attached by a parity check matrix (PCM) of the LDPC coding, and the encoded It may be configured to obtain a codeword from data, the codeword does not include the reference signal sequence, map the reference signal sequence and the codeword to resources, and transmit.
  • PCM parity check matrix
  • the processor may be further configured to divide the data into a plurality of code blocks and attach the reference signal sequence to at least one code block among the plurality of code blocks.
  • the encoded data includes an information part sequence of N bits and a parity part sequence of P bits, N is the number of columns of the information part of the PCM, P is the number of columns of the parity part of the PCM, and the information part sequence
  • N is the number of columns of the information part of the PCM
  • P is the number of columns of the parity part of the PCM
  • the information part sequence The rest of the data and the reference signal sequence except for the data and the reference signal sequence are shortened and not transmitted, and the parity bit sequence is composed of a first parity sequence and a second parity sequence, and the second parity sequence may not be transmitted.
  • the codeword may include the data and the first parity sequence.
  • the rest of the information partial sequence excluding the data and the reference signal sequence may consist of only some bits of the data.
  • the first parity sequence and the second parity sequence are generated based on the PCM, and the length of the second parity sequence is based on a length of the information partial sequence excluding the data and the reference signal sequence. Can be determined.
  • the rest of the information partial sequence excluding the data and the reference signal sequence may be composed of only zero bits.
  • the transmitter may communicate with at least one of a mobile terminal, a base station, and an autonomous vehicle.
  • the transmitter may be included or mounted in an autonomous vehicle.
  • the transmitter may implement at least one ADAS (advanced driver assistance system) function based on a signal for controlling the movement of the autonomous vehicle.
  • ADAS advanced driver assistance system
  • the transmitter may switch the driving mode of the autonomous vehicle from an autonomous driving mode to a manual driving mode or from a manual driving mode to an autonomous driving mode based on a user input.
  • the transmitter may generate an autonomous driving command based on external object information, and the autonomous driving vehicle may autonomously travel based on the autonomous driving command.
  • the external object information may include at least one of a distance between an external object and the autonomous vehicle and a relative speed of the external object with respect to the autonomous vehicle.
  • the effective coding rate can be lowered by including the reference signal in the information portion of LDPC coding.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100. As shown in FIG.
  • FIG. 2 is an exemplary diagram for explaining a channel coding method using an LDPC code according to the present disclosure.
  • 3 and 4 are exemplary diagrams for explaining a modulation method according to the present disclosure.
  • FIG. 5 is a diagram illustrating positions of a data signal and a reference signal (or pilot signal) on a time-frequency axis according to the present disclosure.
  • FIG. 6 shows a structure of a parity check matrix (PCM) of LDPC coding according to the present disclosure.
  • PCM parity check matrix
  • FIG. 7 is an exemplary diagram illustrating a method of performing pilot-aided LDPC coding in a transmitter according to the present disclosure.
  • FIG. 9 is an exemplary diagram for explaining an LDPC decoding method of a receiver according to the present disclosure.
  • FIG. 10 is an exemplary diagram for explaining an LLR initialization process according to the present disclosure.
  • FIG. 11 shows a graph comparing BLER performance of a pilot-aided LDPC code encoding/decoding method according to the present disclosure and an existing LDPC code encoding/decoding method.
  • the mobile communication system is a 3GPP LTE, LTE-A system, or 5G communication system, except for the specifics of 3GPP LTE and LTE-A. It can also be applied to mobile communication systems.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with radio technologies such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE).
  • OFDMA may be implemented with a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), and the like.
  • UTRA is a part of Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) employs OFDMA in downlink and SC-FDMA in uplink as part of Evolved UMTS (E-UMTS) using E-UTRA.
  • LTE-A Advanced is an evolved version of 3GPP LTE.
  • 3GPP LTE/LTE-A/LTE-A pro or 5G/NR is mainly described, but the technical idea of the present disclosure is not limited thereto.
  • specific terms used in the following description are provided to aid understanding of the present disclosure, and the use of these specific terms may be changed in other forms without departing from the technical spirit of the present disclosure.
  • low density parity check (LDPC) coding is applied to uplink data transmitted/received through PUSCH and downlink data transmitted/received through PDSCH, and polar code is applied to DCI.
  • LDPC low density parity check
  • Reed-Muller coding is applied for UCI with a small number of bits
  • Polar code is applied for UCI with a large number of bits (see 3GPP TS 38.212).
  • a communication device uses an LDPC code to encode/decode uplink/downlink data.
  • the NR system supports two LDPC base graphs (BG) (i.e., two LDPC base matrices): LDPC BG1 optimized for small transport blocks and LDPC BG2 optimized for larger transport blocks.
  • BG LDPC base graphs
  • LDPC BG1 is designed based on the mother code rate 1/3
  • LDPC BG2 is designed based on the mother code rate 1/5 LDPC BG1
  • LDPC BG2 used for encoding/decoding in NR system are 3GPP It is defined in TS 38.212.
  • the communication device selects LDPC BG1 or LDPC BG2 based on the size of the transport block and the coding rate R and uses it for encoding/decoding the transport block.
  • the coding rate R is a modulation and coding scheme (modulation). is indicated by a and coding scheme, MCS) index I MCS.
  • MCS modulation and coding scheme
  • the MCS index or dynamically provided to the UE by the PDCCH scheduling the PUSCH or PDSCH to carry the transport block, set the grant (configured grant) for activating or initializing It is provided to the UE by PDCCH, or provided to the UE by RRC signaling associated with the set grant.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100. As shown in FIG.
  • the wireless communication system 100 includes one or more base stations and/or one or more It may include a terminal.
  • a base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit/receive antenna 130, a processor 180, a memory 185, and a receiver ( 190), a symbol demodulator 195, and a reception data processor 197 may be included.
  • the terminal 110 is a transmission (Tx) data processor 165, a symbol modulator 170, a transmitter 175, a transmission/reception antenna 135, a processor 155, a memory 160, a receiver 140, a symbol It may include a demodulator 155 and a receiving data processor 150.
  • the base station 105 and the terminal 110 are provided with a plurality of transmitting and receiving antennas. Accordingly, the base station 105 and the terminal 110 according to the present disclosure support a multiple input multiple output (MIMO) system. In addition, the base station 105 according to the present disclosure may support both Single User-MIMO (SU-MIMO) and Multi User-MIMO (MU-MIMO) schemes.
  • MIMO multiple input multiple output
  • SU-MIMO Single User-MIMO
  • MU-MIMO Multi User-MIMO
  • the base station 105 may be a first device.
  • the first device is a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a drone (Unmanned Aerial Vehicle, UAV), an AI (Artificial Intelligence) module, a robot, Augmented Reality (AR) device, Virtual Reality (VR) device, MTC device, IoT device, medical device, fintech device (or financial device), security device, climate/environment device or other 4th industrial revolution field or 5G service It may be a device related to.
  • a drone may be a vehicle that is not human and is flying by a radio control signal.
  • the MTC device and the IoT device are devices that do not require direct human intervention or manipulation, and may be smart meters, bending machines, thermometers, smart light bulbs, door locks, and various sensors.
  • a medical device is a device used for the purpose of diagnosing, treating, alleviating, treating or preventing a disease, as a device used for the purpose of examining, replacing, or modifying a structure or function. In vitro) diagnostic devices, hearing aids, surgical devices, and the like.
  • a security device is a device installed to prevent a risk that may occur and maintain safety, and may be a camera, a CCTV, or a black box.
  • a fintech device is a device capable of providing financial services such as mobile payment, and may be a payment device, a point of sales (POS), or the like.
  • the climate/environment device may mean a device that monitors and predicts climate/environment.
  • the terminal includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, a slate PC, and a tablet PC.
  • PDA personal digital assistant
  • PMP portable multimedia player
  • tablet PC tablet PC
  • ultrabook wearable device (e.g., smartwatch, smart glass, head mounted display), foldable device, etc. It may include.
  • the HMD is a type of display device worn on the head and may be used to implement VR or AR.
  • the transmit data processor 115 receives traffic data, formats and codes the received traffic data, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the modulation symbols ("data Symbols").
  • the symbol modulator 120 receives and processes these data symbols and pilot symbols and provides a stream of symbols.
  • the symbol modulator 120 multiplexes data and pilot symbols and transmits them to the transmitter 125.
  • each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero.
  • pilot symbols may be transmitted continuously.
  • the pilot symbols may be frequency division multiplexing (FDM), orthogonal frequency division multiplexing (OFDM), time division multiplexing (TDM), or code division multiplexing (CDM) symbols.
  • the transmitter 125 receives a stream of symbols and converts it into one or more analog signals, and further adjusts the analog signals (e.g., amplifies, filters, and frequency upconverts), A downlink signal suitable for transmission through is generated, and the transmission antenna 130 transmits the generated downlink signal to the terminal.
  • analog signals e.g., amplifies, filters, and frequency upconverts
  • the reception antenna 135 receives a downlink signal from the base station and provides the received signal to the receiver 140.
  • Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizing the adjusted signal to obtain samples.
  • the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
  • the symbol demodulator 145 receives an estimate of the frequency response for the downlink from the processor 155, performs data demodulation on the received data symbols, and provides a data symbol estimate (which is estimates of the transmitted data symbols). Acquires and provides data symbol estimates to a receive (Rx) data processor 150.
  • the received data processor 150 demodulates (ie, symbol demapping) the data symbol estimates, deinterleaving, and decoding, and recovers the transmitted traffic data.
  • the processing by the symbol demodulator 145 and the receive data processor 150 is complementary to the processing by the symbol modulator 120 and the transmit data processor 115 at the base station 105, respectively.
  • the terminal 110 processes the traffic data on the uplink and the transmission data processor 165 provides data symbols.
  • the symbol modulator 170 may receive data symbols, multiplex them, and perform modulation to provide a stream of symbols to the transmitter 175.
  • the transmitter 175 receives and processes a stream of symbols to generate an uplink signal.
  • the transmit antenna 135 transmits the generated uplink signal to the base station 105.
  • the transmitter and receiver in the terminal and the base station may be configured as one radio frequency (RF) unit.
  • RF radio frequency
  • an uplink signal is received from the terminal 110 through the reception antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
  • the symbol demodulator 195 then processes these samples and provides received pilot symbols and data symbol estimates for the uplink.
  • the reception data processor 197 processes the data symbol estimate and recovers the traffic data transmitted from the terminal 110.
  • the processors 155 and 180 of each of the terminal 110 and the base station 105 instruct (eg, control, coordinate, manage, etc.) operations in the terminal 110 and the base station 105, respectively.
  • Each of the processors 155 and 180 may be connected to memory units 160 and 185 that store program codes and data.
  • the memories 160 and 185 are connected to the processor 180 to store an operating system, an application, and general files.
  • the processors 155 and 180 may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, or the like. Meanwhile, the processors 155 and 180 may be implemented by hardware, firmware, software, or a combination thereof. When implementing the embodiment of the present disclosure using hardware, application specific integrated circuits (ASICs) or digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) configured to perform the present disclosure , Field programmable gate arrays (FPGAs), etc. may be provided in the processors 155 and 180.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • firmware or software may be configured to include a module, procedure, or function that performs the functions or operations of the present disclosure.
  • Firmware or software configured to be capable of being provided in the processors 155 and 180 or stored in the memories 160 and 185 may be driven by the processors 155 and 180.
  • Layers of the radio interface protocol between the terminal and the base station in the wireless communication system are based on the lower three layers of the open system interconnection (OSI) model, which is well known in the communication system. ), and a third layer (L3).
  • the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
  • the Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
  • the terminal and the base station may exchange RRC messages through the radio communication network and the RRC layer.
  • the processor 155 of the terminal and the processor 180 of the base station process signals and data, excluding functions and storage functions for receiving or transmitting signals from the terminal 110 and the base station 105, respectively.
  • the processors 155 and 180 are not specifically mentioned below. Even if the processors 155 and 180 are not specifically mentioned, it may be said that a series of operations such as data processing are performed, not a function of receiving or transmitting a signal.
  • FIG. 2 is an exemplary diagram for explaining a channel coding method using an LDPC code according to the present disclosure.
  • Transport block Data subject to channel coding is referred to as a transport block, and in general, according to the efficiency of channel coding, the transport block is divided into code blocks of a certain size or less.
  • the code block is 6144 bits or less
  • the code block is 8448 bits or less (for base graph 1) or 3840 bits or less (base graph 2). Case).
  • the channel coding method includes the steps of attaching a CRC code to a transport block (S205); Dividing into code blocks (S210); Encoding the divided code blocks (S215); Rate matching the encoded code blocks (S220); And concatenating rate-matched code blocks (S225).
  • parity bits of length L are attached to the transport blocks 255, a 0 , ..., a A-1 .
  • the length L may be at least one of 6, 11, 16, and 24.
  • parity bits are generated using cyclic generator polynomials.
  • the output bits 260, b 0 , ..., b B-1 according to the CRC attachment process may be subjected to a scrambling operation using a radio network temporary identifier (RNTI). According to the scrambling operation, a scrambling sequence and an exclusive OR operation may be applied to a corresponding bit.
  • RNTI radio network temporary identifier
  • the output bits 260, b 0 , ..., b B-1 according to the CRC attachment process are separated into code blocks 265 according to the code block size (S210). This is called code block segmentation.
  • the code block size is determined according to the channel coding method. A code block size for efficiently performing each channel coding method may be determined theoretically or experimentally.
  • each of the separated code blocks 265, c r0 , ..., c r(Kr-1) ) is coded bits 270, d r0 , ..., d r( Nr-1) ).
  • the LDPC coding method may be performed by any one of a random like coding method or a structured coding method. In some cases, the LDPC coding method may perform encoding using a generator matrix. Alternatively, the LDPC coding method may perform encoding using a base graph. 3GPP TS 38.212 specifies that encoding is performed using a base graph according to a quasi cyclic LDPC (QC-LDPC) coding method.
  • QC-LDPC quasi cyclic LDPC
  • Tables 1 and 2 below show the base graph 1 (BG1) specified in 3GPP TS 38.212.
  • Tables 1 and 2 are tables connected to each other up and down.
  • Table 3 and Table 4 below show the base graph 2 (BG2) specified in 3GPP TS 38.212.
  • Tables 3 and 4 are tables connected to each other up and down.
  • Each of the code blocks 265, c r0 , ..., c r(Kr-1 ) is channel coding performed (S215), and coded bits 270, d r0 , ..., d r(Nr-1) ) is generated.
  • the generated encoded bits 270 may be rate matched through shortening and puncturing processes.
  • the encoded bits 270 may be rate matched by performing a subblock interleaving process, a bit selection process, and an interleaving process. That is, the encoded bits 270, d r0 , ..., d r(Nr-1) ) are converted to rate-matched bits 275, f r0 , ..., f r(gr-1) ).
  • interleaving refers to a process of changing the order of a bit sequence. By interleaving, the occurrence of errors can be distributed. In consideration of efficient deinterleaving, an interleaving process is designed.
  • the sub-block interleaving process may be a process of dividing a code block into a plurality of sub-blocks (eg, 32 sub-blocks) and allocating bits to each sub-block according to an interleaving method.
  • a bit sequence may be increased by repeating the bits according to the number of bits to be rate matched, or a bit sequence may be decreased according to a method such as shortening or puncture.
  • bits encoded after the bit selection process may be interleaved.
  • the rate matching process may include a bit selection process and an interleaving process.
  • the sub-block interleaving process is not essential.
  • a code block concatenation process (S225) is performed to concatenate the code blocks 275 to generate a codeword (280, g 0 , ..., g G-1 ) (S225 )can do.
  • One generated codeword 280 may correspond to one transport block 255.
  • One or more codewords are input and scrambled (S305, S405).
  • the scrambling process may be performed based on a bit sequence in which an input bit sequence is determined and an exclusive OR operation.
  • the scrambled bits are modulated (S310, S410), and the modulated symbols are mapped to a layer (S315, S415).
  • the symbols mapped to the layer are precoded (S320, S420) to map to an antenna port, and the precoded symbols are mapped to a resource element (S325, S425).
  • the mapped symbols are generated as OFDM signals (S330 and S430) and transmitted through an antenna.
  • FIG. 5 is a diagram illustrating positions of a data signal and a reference signal (or pilot signal) on a time-frequency axis according to the present disclosure.
  • the present disclosure provides a method of encoding and decoding by utilizing a pilot sequence used for channel estimation in a coding chain.
  • the pilot sequence may be a reference signal.
  • resources for a data sequence and a pilot sequence are operated orthogonally to each other, and the pilot sequence is located on a frame or subframe with a constant interval in time-frequency units. do.
  • the quasi cyclic low density parity check (QC-LDPC) code is a widely used linear block code technique because of its ease of hardware implementation.
  • the NR standard (3GPP TS 38 series) was also adopted as an error correction code for the data channel.
  • a parity check matrix (PCM) having an appropriate size according to the length of an information sequence, which is an input value of LDPC coding, is supported. Usually, the number of PCM columns is larger than the length of the information sequence. However, the lengths of each of the input information sequences may be different.
  • LDPC BG1 LDPC base graph 1
  • LDPC BG2 LDPC base graph 2
  • shortening means that some of the sequences used for codeword generation are not transmitted by setting of the transmitting and receiving end.
  • puncturing means that some sequences are not transmitted among the generated codewords.
  • a sequence that is not transmitted by the shortening may be referred to as a shortened sequence.
  • a sequence that is not transmitted by the puncturing may be referred to as a punctured sequence.
  • the sequence not transmitted by the puncturing may be part of the parity sequence.
  • the shortening technique and the puncturing technique do not mean removing or changing the row, column, or matrix elements of the PCM of LDPC coding.
  • LDPC encoding can be performed according to the PCM of LDPC coding.
  • Shortening technology and puncturing technology are technologies related to not transmitting some data of encoded data from a transmitting device to a receiving device.
  • some data that are not transmitted may be known bits and may be unknown bits.
  • known bits may be referred to as shortened bits.
  • unknown bits may be referred to as punctured bits.
  • the length of the information sequence before encoding (the first information sequence) may be less than or equal to the length of the information portion of the PCM. If the length of the information sequence before encoding is less than the length of the information portion of the PCM, additional bits are added to the information sequence before encoding according to the length of the information portion of the PCM.
  • the additional bits may be zero bits. For example, in DVB-S2 LDPC coding, the additional bits are treated as being zero bits.
  • the additional bits may include some bits of the information sequence before encoding.
  • the additional bits include some bits of the information sequence before encoding, it is said that the additional bits are repeatedly processed.
  • the input value (second information sequence) of LDPC encoding includes the information sequence before encoding and the additional bits.
  • the input value of the LDPC encoding is included in the output value (encoded data) of the LDPC encoding. Since the additional bits are known values, they do not necessarily need to be transmitted. Therefore, the part corresponding to the additional bits among the output values of LDPC encoding may be excluded and transmitted. "Transmitting except for a portion corresponding to the additional bits" may be referred to as "the additional bits are shortened.”
  • the additional bits are part of the pre-encoding information sequence, since the additional bits are redundantly encoded. Typically, the additional bits may not be transmitted. However, in consideration of a trade-off relationship between data processing efficiency and transmission efficiency, the additional bits may be transmitted.
  • the additional bits may be referred to as shortened bits.
  • Both the input value of the LDPC encoding and the output value of the LDPC encoding include the additional bits.
  • the additional bits included in the encoded data correspond to "shortened bits", but there is no change in bit values of the additional bits before and after encoding, and the data is simply not transmitted to the receiving device.
  • Additional bits included in the input value of LDPC encoding are also referred to as "shortened bits”.
  • the shortening does not mean that a bit operation or a shift register operation is performed on the additional bits, but that it is used in LDPC encoding, but is simply not transmitted. This is because even if the additional bits are not transmitted, since the additional bits are known bits, they can be easily recovered in the decoding step.
  • Locations corresponding to the shortened bits may be shared between the transmitting device and the receiving device.
  • Locations corresponding to the punctured bits may be shared between the transmitting device and the receiving device.
  • the shortening method and the puncturing method may also be shared by the transmitting device and the receiving device.
  • the shortened bits may consist of only zero bits, or the shortened bits may consist of only some of the information bits.
  • the second information sequence which is an input value of encoding, is included in the encoded data (output value of LDPC encoding) as it is.
  • the encoded data further includes parity bits.
  • an information sequence (third information sequence) included in the encoded data may be shortened, and parity bits included in the encoded data may be punctured.
  • the third information sequence corresponds to the information portion of the PCM.
  • Parity bits included in the encoded data correspond to the parity part of the PCM.
  • the information part of the PCM means columns of the PCM that are matrix-operated with an information sequence included in the encoded data in a decoding process.
  • the parity part of the PCM means columns of the PCM that are calculated with parity bits included in the encoded data during a decoding process.
  • the length of the information part of the PCM and the length of the information sequence of actual data may be different. Since the length of the information part of the PCM may be larger than the length of the information sequence of the actual data, some bits are excluded from the third information sequence included in the encoded data corresponding to the information part of the PCM. Transmits an information sequence of length. That is, the third information sequence is shortened.
  • the length of the parity part of the PCM and the length of the parity sequence of actual data may be different.
  • encoded data is composed of an information part and a parity part.
  • the information part of the encoded data corresponds to the information part of the PCM
  • the parity part of the encoded data corresponds to the parity part of the PCM.
  • the length of the information part of the PCM means the number of columns of the PCM corresponding to the information part of the encoded data.
  • a portion of the third information sequence included in the encoded data excluding the information sequence of actual data may be shortened.
  • a portion of the third information sequence included in the encoded data corresponding to the information portion of the PCM excluding the information sequence of the actual data may be composed of only zero bits.
  • a portion of the third information sequence included in the encoded data corresponding to the information portion of the PCM, excluding the information sequence of the actual data may be composed of some bits of the information sequence of the actual data.
  • portions of the third information sequence included in the encoded data corresponding to the information portion of the PCM excluding the information sequence of actual data are shortened bits, the shortened bits become known bits.
  • puncturing is based on the shortened length and removes a part of the parity part of the PCM, resulting in an unknown value.
  • the length of the punctured data may be determined according to Equation 1 below.
  • FIG. 6 shows a structure of a parity check matrix (PCM) of LDPC coding according to the present disclosure.
  • PCM parity check matrix
  • the length of the information sequence of actual data (which can be the size of the transport block) is K
  • the length of the information part of the PCM is K'
  • the length of the information part of the PCM is K'-K.
  • PCM is selected so that K'>K.
  • the parity part of the PCM is P'
  • the parity part of the PCM may be punctured so that the length of the parity part of actual data is P based on K'-K. For example, it may be punctured so that the coding rate R is maintained. That is, it can be punctured according to the following equation.
  • rate matching The above-described shortening and puncturing method may be referred to as rate matching.
  • pilot-aided LDPC code by including the pilot sequence in the effective information sequence may be referred to as pilot-aided LDPC code.
  • the pilot signal may be a reference signal
  • the pilot sequence may be a reference sequence or a reference signal sequence. Based on the pilot signal (reference signal), the pilot sequence (reference signal sequence) may be generated.
  • a bit sequence in which a pilot sequence is attached to an information sequence of actual data is referred to as an effective information sequence.
  • the length of the effective information sequence can be referred to as the effective information length Ke.
  • the length of the information sequence of actual data can be expressed as K
  • the PCM may be determined. In general, a PCM having the smallest length of the information portion of the PCM may be selected from those having a length of the information portion of the PCM greater than the effective information length.
  • PCM Since the effective information length is larger than the length K of the information sequence of actual data, a PCM having a larger length of the information portion of the PCM can be used. As the PCM with a larger length of the information portion of the PCM is used, a short cycle decreases and a BLER (block error rate) performance slope may be greatly affected. PCM may be determined according to the following equation.
  • Is a set of circular sizes that mean a segment of the entire PCM.
  • Is Has the number of segments as many as the number of candidates of s, and each segment may have a circular size as many as n candidates for a given s.
  • the length P of the parity sequence of the actual data is the coding rate ( ) Can be determined.
  • the effective coding rate (Re) may be defined by the following equation.
  • the effective coding rate is the nominal coding rate ( It is obvious that it is smaller than ).
  • the pilot --- aided LDPC code it generates a codeword of length Ne.
  • the codeword includes a pure codeword sequence and a pilot sequence.
  • the pure codeword sequence means a partial sequence excluding a pilot sequence from the codeword.
  • the pure codeword sequence includes an information sequence and a parity sequence of real data.
  • the pure codeword sequence and pilot sequence may be stored in separate buffers.
  • the pure codeword sequence may be modulated through an interleaver.
  • the pilot sequence is not interleaved, and a modulation process may be performed on the pilot sequence.
  • the pure codeword sequence and the pilot sequence may be transmitted according to a resource mapping rule.
  • the pilot sequence may be generated according to a predefined method or a method set in the receiving device by the transmitting device so that the transmitting device and the receiving device can know each other.
  • the transmitting device When the transmitting device generates a sequence including complex modulation values for pilot, the sequence including the complex modulation values is converted into a bit sequence according to a predefined or set rule by the transmitting device, and the bit sequence is As the above-described pilot sequence, the channel coding process of the present invention may be performed.
  • the pilot modulation process (eg, the modulation process for the above-described pilot sequence, see S730 of FIG. 7) may correspond to a process of generating a sequence of complex modulation values for pilot.
  • the pilot sequence may be a reference signal sequence.
  • the reference signal may be generated according to a predefined method or a method shared by a transmitting device and a receiving device.
  • the reference signal may be modulated according to a method such as Quadrature phase-shift keying (QPSK), 16 Quadrature amplitude modulation (16QAM), 64QAM, 256QAM, 1024QAM, and symbols corresponding to the reference signal are generated according to the modulation method. do.
  • QPSK Quadrature phase-shift keying
  • 16QAM 16 Quadrature amplitude modulation
  • 64QAM 64QAM
  • 256QAM 256QAM
  • 1024QAM 1024QAM
  • a pseudo-random bit sequence is generated, and the generated pseudo-random bit sequence is mapped to a symbol according to a modulation method. For example, in the case of QPSK, it may be mapped according to the following equation.
  • c(2n) and c(2n+1) may mean the 2n-th bit and the (2n+1)-th bit of the number-random bit sequence
  • r(n) may be referred to as an n-th complex value of a sequence of complex modulation values of the reference signal.
  • the pseudo-random bit sequence may be used as the reference signal sequence of the present invention.
  • r(n) can be understood as a symbol of a reference signal, and r(n) is mapped to a resource element of a resource block, and is generated as a signal.
  • the symbols of the reference signal may correspond to a sequence of complex modulation values (a sequence of complex values) of the reference signal.
  • the length of the reference signal sequence (bit sequence) will be twice the length of the sequence of complex modulation values of the reference signal, and in the case of 16QAM, the length of the reference signal sequence is 4 of the length of the sequence of complex modulation values of the reference signal. Will be doubled.
  • the method of generating the sequence of complex modulation values of the reference signal from the reference signal sequence is not limited to Equation 4 above.
  • the reception device may generate a reference signal sequence from symbols of the reference signal.
  • the reference signal is modulated by QPSK, since one symbol is 2 bits, the symbols mapped with the reference signal may be converted into a bit sequence of 2 bits per symbol.
  • the converted bit sequence may be referred to as a reference signal sequence.
  • a method of generating a sequence of complex modulation values of a reference signal may be applied inversely to generate a bit sequence of 2 bits per symbol.
  • the reference signal sequence (c(0), c(1), ..., c(2n)) from the reference signal complex modulation values sequence (r(0), ..., r(n)) , c(2n+1)) can be generated.
  • the method of generating the reference signal sequence from the sequence of complex modulation values of the reference signal is not limited to applying the method of generating the sequence of complex modulation values of the reference signal in reverse. For example, it is possible to generate a reference signal sequence by assuming QPSK for a sequence of complex modulation values of a reference signal generated by 16QAM.
  • FIG. 7 is an exemplary diagram illustrating a method of performing pilot-aided LDPC coding in a transmitter according to the present disclosure.
  • Data to be transmitted is generated, and a pilot sequence can be attached to the generated data.
  • the pilot sequence refers to data obtained by converting a pilot signal into an appropriate bit sequence.
  • LDPC encoding is performed using data to which a pilot sequence is attached.
  • the generated codeword is separated into a pure codeword and a pilot sequence.
  • the pure codeword may be modulated after interleaving.
  • the pilot sequence may not be interleaved and may only undergo a modulation process.
  • modulating the pilot sequence may correspond to generating a sequence of complex modulation values for a reference signal.
  • the pure codeword and the pilot sequence may be concatenated according to a resource mapping rule, mapped to a resource on a frequency-time axis, and transmitted.
  • a method of performing LDPC coding of a transmitter in a wireless communication system includes a process of attaching a reference signal sequence to data, and a parity check matrix (PCM) of the LDPC coding for data to which the reference signal sequence is attached. ), the encoding process, the process of obtaining a codeword from the encoded data, and the process of resource mapping and transmitting the reference signal sequence and the codeword, wherein the codeword does not include the reference signal sequence.
  • PCM parity check matrix
  • the data may be a transport block.
  • the transport block is divided into a plurality of code blocks, and at least one reference signal sequence may be attached to at least one code block among the plurality of code blocks.
  • LDPC encoding can be performed in units of code blocks. Rate matching for LDPC encoding may be performed before or after encoding.
  • the encoded code block includes an information part and a parity part.
  • the information part of the encoded code block includes some of the bits of the code block before encoding, and the parity part of the encoded code block includes parity bits generated by encoding.
  • rate matching is performed after encoding, a partial sequence among the information parts may be shortened, and a partial sequence among the parity parts may be punctured.
  • the information part may be repetitioned according to the size of the code block, and may be zero padded.
  • the partial sequence of the information part is repeatedly processed according to the size of the code block or the zero padded bits are known bits, and thus may be shortened. That the partial sequence of the information part is repeatedly processed according to the size of the code block means that the partial sequence of the information part includes a partial sequence of actual data. That is, the bits generated by the repetition process are not shortened and transmitted so that they can be used in a decoding process, thereby improving the quality of channel coding. Bits shortened during the encoding process may be restored to known bits during the decoding process. Parity bits may be punctured according to the coding rate and signal quality.
  • parity bits can also be recovered based on the information part, but in general, parity bits are not recovered in the decoding process in consideration of computing power, but are processed as unknown bits. Unknown bits are regarded as zero bits, and can be decoded. For rate matching, refer to the description of FIG. 8 below.
  • a part corresponding to the reference signal sequence may be excluded and transmitted.
  • the reference signal sequence is modulated, mapped to a resource element of the reference signal, and transmitted.
  • modulating the reference signal sequence may correspond to generating a sequence of complex modulation values for the reference signal. It is possible to obtain a pure codeword including an information part and a parity part among the encoded code blocks.
  • the obtained net codeword may be mapped to resource elements on a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) and transmitted.
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • the columns of the parity check matrix include columns corresponding to the information part of the codeword (the information part of the PCM) and columns (the parity part of the PCM) corresponding to the parity part.
  • the information part of the codeword includes an information sequence of actual data, a reference signal sequence obtained by converting a reference signal into bits, and a padding sequence.
  • the parity portion of the codeword may include parity bits obtained by channel-coding the information portion of the codeword.
  • the padding sequence may be excluded from the shortening process. Some bits of the parity part of the codeword may be punctured.
  • K is the length of the information sequence of actual data
  • Kp is the length of the pilot sequence
  • P is the length of the punctured parity bit
  • K' is the length of the information part of PCM
  • P' is the length of the parity part of PCM.
  • a portion corresponding to the length (K'-K-Kp) of the length (K') of the information portion of the PCM is shortened.
  • the part corresponding to the length (P'-P) is punctured.
  • a pilot signal is selected from the obtained modulated signals to perform channel estimation and channel compensation.
  • a net codeword sequence is obtained from among the obtained modulated signals.
  • the obtained pure codeword sequence is demodulated to obtain a soft value (log-likelihood ratio) value.
  • the punctured sequence is an unknown sequence in the receiving device, it is treated as a zero (0) value, and since the pilot sequence is a known sequence in the receiving device, it is determined as ⁇ inf according to the sequence pattern. do.
  • ⁇ inf may be a maximum value among available values.
  • the shortened sequence is also a known value, it is determined as ⁇ inf and can be properly recovered.
  • the pilot sequence and the shortened sequence may be a known sequence. According to an appointment between the transmitter and the receiver, the pilot sequence and the shortened sequence can be known. Known values of the pilot sequence and the shortened sequence may be an input sequence of the LLR value.
  • the LLR value sequence, pilot sequence, shortened sequence, and punctured sequence of data are combined to generate a soft value input sequence.
  • the process of generating the soft value input sequence may be referred to as an LLR initialization process.
  • LDPC coding may be performed based on the soft value input sequence.
  • FIG. 9 is an exemplary diagram for explaining an LDPC decoding method of a receiver according to the present disclosure.
  • the LDPC decoding method of a receiver in a wireless communication system includes a process of obtaining a reference signal by demapping resource elements, a process of estimating a channel using the reference signal, and a channel using the reference signal.
  • a process of compensating, a process of demodulating a first codeword, a process of deinterleaving the demodulated first codeword, and a second process based on the deinterleaved first codeword and the reference signal It may include a process of generating a codeword, a process of LDPC decoding the second codeword, and a process of checking a CRC of the decoded second codeword.
  • the first codeword may include an information sequence and a parity sequence.
  • the second codeword may include the information sequence, a reference signal sequence generated from the reference signal, and the parity sequence.
  • the second codeword may restore bits excluded in the shortening process and punctured parity bits. Bits that are not transmitted by the shortening process are known bits and can be restored, but since the punctured parity bits are unknown bits, they may be set to zero bits. When bits not transmitted in the shortening process are bits in which some bits of the information sequence are repeatedly processed according to the length of the information part of the PCM, they may be recovered from the information sequence. If the bits that are not transmitted in the shortening process are zero-padded bits, since they are all zero bits, they can be restored.
  • the process of generating the second codeword may be referred to as log-likelihood ratio (LLR) initialization.
  • LLR log-likelihood ratio
  • FIG. 10 is an exemplary diagram for explaining an LLR initialization process according to the present disclosure.
  • the second codeword may include punctured parity bits (puncturing information), an information sequence, a reference signal sequence, a shortening sequence, and a parity sequence.
  • the punctured parity bits are generated by processing with zero bits, the information sequence and the parity sequence are demodulated and generated, and the reference signal sequence and the shortening sequence are generated as known bits.
  • a second codeword is generated according to the initial phase of the LLR and the process (S1005).
  • the generated second codeword is decoded by the LDPC decoder.
  • the parity check matrix (PCM) of the LDPC code and the second codeword are sum producted to determine that the result is a zero vector, thereby decoding (S1005).
  • FIG. 11 shows a graph comparing BLER performance of a pilot-aided LDPC code encoding/decoding method according to the present disclosure and an existing LDPC code encoding/decoding method.
  • the pilot sequence used a random binary sequence. In the binary AWGN channel environment, channel estimation and compensation are omitted.
  • As the LDPC decoding method a sum product algorithm was used, and the maximum iteration was set to 50.
  • the waterfall compared to the conventional method, it is confirmed that the waterfall exhibits similar performance, but the slope is steeper. Since the pilot sequence is additionally utilized for LDPC encoding and a larger PCM is used, a short cycle can be reduced, an effective coding rate is reduced, and a coding gain can be secured. Thus, a slope gain effect can be obtained.
  • three usage scenarios of 5G are (1) an enhanced mobile broadband (eMBB) area, and (2) a large amount of machine type communication (mMTC). And (3) an Ultra-reliable and Low Latency Communications (URLLC) area.
  • eMBB enhanced mobile broadband
  • mMTC machine type communication
  • URLLC Ultra-reliable and Low Latency Communications
  • KPI key performance indicator
  • eMBB is about human-centered communication. eMBB goes far beyond basic mobile Internet access, covering rich interactive work, media and entertainment applications in the cloud or augmented reality. Data is one of the key drivers of 5G, and it may not be possible to see dedicated voice services for the first time in the 5G era. In 5G, voice is expected to be processed as an application program simply using the data connection provided by the communication system. The main reasons for the increased traffic volume are an increase in content size and an increase in the number of applications requiring high data rates. Streaming services (audio and video), interactive video and mobile Internet connections will become more widely used as more devices connect to the Internet. Many of these applications require always-on connectivity to push real-time information and notifications to the user.
  • Cloud storage and applications are increasing rapidly in mobile communication platforms, which can be applied to both work and entertainment.
  • cloud storage is a special use case that drives the growth of the uplink data rate.
  • 5G is also used for remote work in the cloud, and requires much lower end-to-end delays to maintain a good user experience when tactile interfaces are used.
  • Entertainment For example, cloud gaming and video streaming is another key factor that is increasing the demand for mobile broadband capabilities. Entertainment is essential on smartphones and tablets anywhere, including high mobility environments such as trains, cars and airplanes.
  • Another use case is augmented reality and information retrieval for entertainment.
  • augmented reality requires very low latency and an instantaneous amount of data.
  • mMTC massive machine-centric communication
  • IoT devices are expected to reach 20.4 billion.
  • Industrial IoT is one of the usage scenarios where 5G plays a major role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.
  • URLLC encompasses human-centric communication and machine-centric communication.
  • URLLCs require stringent requirements for delay, reliability and availability, such as remote control of critical infrastructure and autonomous vehicles (self-driving vehicles, autonomous vehicles, driverless cars, robot cars).
  • URLLC includes new services that will change the industry through communication that meets the conditions of ultra reliability / low latency / high availability. URLLC will play an important role in the foundation for the Fourth Industrial Revolution.
  • the level of reliability and delay is essential for smart grid control, telemedicine surgery, industrial automation, robotics, and drone control and coordination. According to the characteristics of reliability, low delay, and high availability, URLLC is also called a critical MTC (C-MTC).
  • C-MTC critical MTC
  • 5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means of providing streams rated at hundreds of megabits per second to gigabits per second. This high speed is required to deliver TVs in 4K or higher (6K, 8K and higher) resolutions as well as virtual and augmented reality.
  • Virtual Reality (VR) and Augmented Reality (AR) applications involve almost immersive sports events. Certain application programs may require special network settings. In the case of VR games, for example, game companies may need to integrate core servers with network operators' edge network servers to minimize latency.
  • Automotive is expected to be an important new driving force in 5G, with many use cases for mobile communication to vehicles. For example, entertainment for passengers demands simultaneous high capacity and high mobility mobile broadband. The reason is that future users will continue to expect high-quality connections, regardless of their location and speed.
  • Another application example in the automotive field is an augmented reality dashboard. It identifies an object in the dark on top of what the driver is looking through the front window, and displays information that tells the driver about the distance and movement of the object overlaid.
  • wireless modules enable communication between vehicles, exchange of information between the vehicle and the supporting infrastructure, and exchange of information between the vehicle and other connected devices (eg, devices carried by a pedestrian).
  • the safety system allows the driver to lower the risk of accidents by guiding alternative courses of action to make driving safer.
  • the next step will be a remote controlled or self-driving vehicle. It is very reliable and requires very fast communication between different autonomous vehicles and between the vehicle and the infrastructure. In the future, autonomous vehicles will perform all driving activities, and drivers will be forced to focus only on traffic anomalies that autonomous vehicles cannot identify. The technical requirements of autonomous vehicles require ultra-low latency and ultra-fast reliability to increase traffic safety to levels that cannot be achieved by humans.
  • Smart cities and smart homes referred to as smart society, will be embedded with high-density wireless sensor networks.
  • a distributed network of intelligent sensors will identify the conditions for cost and energy-efficient maintenance of a city or home.
  • a similar setup can be done for each household.
  • Temperature sensors, window and heating controllers, burglar alarms and appliances are all wirelessly connected. Many of these sensors are typically low data rates, low power and low cost. However, for example, real-time HD video may be required in certain types of devices for surveillance.
  • the smart grid interconnects these sensors using digital information and communication technologies to collect information and act accordingly. This information can include the behavior of suppliers and consumers, allowing smart grids to improve efficiency, reliability, economics, sustainability of production and the distribution of fuels such as electricity in an automated way.
  • the smart grid can also be viewed as another low-latency sensor network.
  • the health sector has many applications that can benefit from mobile communications.
  • the communication system can support telemedicine providing clinical care from remote locations. This can help reduce barriers to distance and improve access to medical services that are not consistently available in remote rural areas. It is also used to save lives in critical care and emergencies.
  • a wireless sensor network based on mobile communication may provide remote monitoring and sensors for parameters such as heart rate and blood pressure.
  • Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. Thus, the possibility of replacing cables with reconfigurable wireless links is an attractive opportunity for many industries. However, achieving this requires that the wireless connection operates with a delay, reliability and capacity similar to that of the cable, and its management is simplified. Low latency and very low error probability are new requirements that need to be connected to 5G.
  • Logistics and freight tracking are important use cases for mobile communications that enable tracking of inventory and packages from anywhere using location-based information systems. Logistics and freight tracking use cases typically require low data rates, but require a wide range and reliable location information.
  • a method of performing low density parity check (LDPC) coding of a transmitter in a wireless communication system includes: attaching a reference signal sequence to data; Encoding the data to which the reference signal sequence is attached using a parity check matrix (PCM) of the LDPC coding; Obtaining a codeword from the encoded data, the codeword not including the reference signal sequence; And mapping the reference signal sequence and the codeword to resources and transmitting the same.
  • PCM parity check matrix
  • Attaching the reference signal sequence to the data includes: dividing the data into a plurality of code blocks; And attaching the reference signal sequence to at least one code block among the plurality of code blocks.
  • the encoded data includes an information part sequence of N bits and a parity part sequence of P bits, N is the number of columns of the information part of the PCM, P is the number of columns of the parity part of the PCM, and the information part sequence
  • N is the number of columns of the information part of the PCM
  • P is the number of columns of the parity part of the PCM
  • the information part sequence The rest of the data and the reference signal sequence except for the data and the reference signal sequence are shortened and not transmitted, and the parity bit sequence is composed of a first parity sequence and a second parity sequence, and the second parity sequence may not be transmitted.
  • the codeword may include the data and the first parity sequence.
  • the rest of the information partial sequence excluding the data and the reference signal sequence may consist of only some bits of the data.
  • the first parity sequence and the second parity sequence are generated based on the PCM, and the length of the second parity sequence is based on a length of the information partial sequence excluding the data and the reference signal sequence. Can be determined.
  • the rest of the information partial sequence excluding the data and the reference signal sequence may be composed of only zero bits.
  • a transmitter for performing low density parity check (LDPC) coding in a wireless communication system includes: a memory connected to a processor; And the processor, wherein the processor attaches a reference signal sequence to data, and encodes the data to which the reference signal sequence is attached by a parity check matrix (PCM) of the LDPC coding, and the encoded It may be configured to obtain a codeword from data, the codeword does not include the reference signal sequence, map the reference signal sequence and the codeword to resources, and transmit.
  • PCM parity check matrix
  • the processor may be further configured to divide the data into a plurality of code blocks and attach the reference signal sequence to at least one code block among the plurality of code blocks.
  • the encoded data includes an information part sequence of N bits and a parity part sequence of P bits, N is the number of columns of the information part of the PCM, P is the number of columns of the parity part of the PCM, and the information part sequence
  • N is the number of columns of the information part of the PCM
  • P is the number of columns of the parity part of the PCM
  • the information part sequence The rest of the data and the reference signal sequence except for the data and the reference signal sequence are shortened and not transmitted, and the parity bit sequence is composed of a first parity sequence and a second parity sequence, and the second parity sequence may not be transmitted.
  • the codeword may include the data and the first parity sequence.
  • the rest of the information partial sequence excluding the data and the reference signal sequence may consist of only some bits of the data.
  • the first parity sequence and the second parity sequence are generated based on the PCM, and the length of the second parity sequence is based on a length of the information partial sequence excluding the data and the reference signal sequence. Can be determined.
  • the rest of the information partial sequence excluding the data and the reference signal sequence may be composed of only zero bits.
  • a transmitter for performing LDPC coding in a wireless communication system may be included in an autonomous driving apparatus that communicates with at least one of a mobile terminal, a base station, and an autonomous vehicle.
  • the transmitter may communicate with at least one of a mobile terminal, a base station, and an autonomous vehicle.
  • the transmitter may be included or mounted in an autonomous vehicle.
  • the transmitter may implement at least one ADAS (advanced driver assistance system) function based on a signal for controlling the movement of the autonomous vehicle.
  • ADAS advanced driver assistance system
  • the transmitter may switch the driving mode of the autonomous vehicle from an autonomous driving mode to a manual driving mode or from a manual driving mode to an autonomous driving mode based on a user input.
  • the transmitter may generate an autonomous driving command based on external object information, and the autonomous driving vehicle may autonomously travel based on the autonomous driving command.
  • the external object information may include at least one of a distance between an external object and the autonomous vehicle and a relative speed of the external object with respect to the autonomous vehicle.
  • each component or feature should be considered optional unless explicitly stated otherwise.
  • Each component or feature may be implemented in a form that is not combined with other components or features.
  • the order of operations described in the embodiments of the present disclosure may be changed. Some configurations or features of one embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is obvious that the embodiments may be configured by combining claims that do not have an explicit citation relationship in the claims or may be included as new claims by amendment after filing. Further, each of the embodiments presented in the present disclosure may be implemented individually, but each of the embodiments may be implemented in a combined form.
  • a method and apparatus for performing encoding based on a parity check matrix of a low-density parity check code in a wireless communication system can be industrially used in various wireless communication systems such as 3GPP LTE/LTE-A/LTE-A PRO and 5G systems.

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Abstract

L'invention concerne un procédé permettant d'effectuer un codage de contrôle de parité à faible densité (LDPC) d'un émetteur dans un système de communication sans fil qui comprend les étapes suivantes: le rattachement d'une séquence de signaux de référence à des données; le codage des données auxquelles la séquence de signaux de référence est rattachée, à l'aide d'une matrice de contrôle de parité (PCM) du codage LDPC; l'obtention d'un mot de code à partir des données codées, le mot de code ne comprenant pas la séquence de signaux de référence; et le mappage de la séquence de signaux de référence et du mot de code pour une ressource et la transmission de la séquence de signaux de référence mappée et du mot de code.
PCT/KR2019/007270 2019-06-17 2019-06-17 Procédé et appareil permettant d'effectuer un codage sur la base d'une matrice de contrôle de parité d'un code de contrôle de parité à faible densité dans un système de communication sans fil WO2020256164A1 (fr)

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Cited By (1)

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CN115276910A (zh) * 2022-07-29 2022-11-01 深圳鹏龙通科技有限公司 Ldpc速率匹配方法、信号发送装置和信号接收装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070121742A1 (en) * 2005-11-11 2007-05-31 Satoshi Tamaki Method and apparatus for encoded signal mapping for multi-carrier communication
WO2011062444A2 (fr) * 2009-11-20 2011-05-26 엘지전자 주식회사 Procédé et appareil pour émettre et recevoir un signal de diffusion
US20120314711A1 (en) * 2008-11-05 2012-12-13 Broadcom Corporation Header encoding for single carrier (SC) and/or orthogonal frequency division multiplexing (OFDM) using shortening, puncturing, and/or repetition
KR20160105313A (ko) * 2015-02-27 2016-09-06 한국전자통신연구원 고정 길이 시그널링 정보 부호화를 위한 패리티 인터리빙 장치 및 이를 이용한 패리티 인터리빙 방법
US20160323074A1 (en) * 2000-11-30 2016-11-03 Ipr Licensing, Inc. Reverse link pilot integrated with block codes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160323074A1 (en) * 2000-11-30 2016-11-03 Ipr Licensing, Inc. Reverse link pilot integrated with block codes
US20070121742A1 (en) * 2005-11-11 2007-05-31 Satoshi Tamaki Method and apparatus for encoded signal mapping for multi-carrier communication
US20120314711A1 (en) * 2008-11-05 2012-12-13 Broadcom Corporation Header encoding for single carrier (SC) and/or orthogonal frequency division multiplexing (OFDM) using shortening, puncturing, and/or repetition
WO2011062444A2 (fr) * 2009-11-20 2011-05-26 엘지전자 주식회사 Procédé et appareil pour émettre et recevoir un signal de diffusion
KR20160105313A (ko) * 2015-02-27 2016-09-06 한국전자통신연구원 고정 길이 시그널링 정보 부호화를 위한 패리티 인터리빙 장치 및 이를 이용한 패리티 인터리빙 방법

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115276910A (zh) * 2022-07-29 2022-11-01 深圳鹏龙通科技有限公司 Ldpc速率匹配方法、信号发送装置和信号接收装置

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