KR20170086145A - Method and Apparatus for Channel Coding/Decoding in Wireless Communication System Based on Orthogonal Frequency Division Multiplexing - Google Patents

Method and Apparatus for Channel Coding/Decoding in Wireless Communication System Based on Orthogonal Frequency Division Multiplexing Download PDF

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KR20170086145A
KR20170086145A KR1020160005062A KR20160005062A KR20170086145A KR 20170086145 A KR20170086145 A KR 20170086145A KR 1020160005062 A KR1020160005062 A KR 1020160005062A KR 20160005062 A KR20160005062 A KR 20160005062A KR 20170086145 A KR20170086145 A KR 20170086145A
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data
packet
size
unit
bit
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KR1020160005062A
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Korean (ko)
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이준구
김근영
임태규
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주식회사 에치에프알
한국과학기술원
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Priority to KR1020160005062A priority Critical patent/KR20170086145A/en
Publication of KR20170086145A publication Critical patent/KR20170086145A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0078Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0083Formatting with frames or packets; Protocol or part of protocol for error control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H04L1/0008Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length by supplementing frame payload, e.g. with padding bits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2626Arrangements specific to the transmitter
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/20Manipulating the length of blocks of bits, e.g. padding or block truncation

Abstract

A channel encoding / decoding method and apparatus therefor in an OFDM-based wireless communication system are disclosed.
The present invention relates to a channel encoding / decoding method and an apparatus therefor in an OFDM-based wireless communication system in which a zero bit is added and encrypted in a channel coding of an OFDM transmitter, and a zero bit added in a channel decoding is removed by a receiver of an OFDM .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel coding / decoding method in an OFDM-based wireless communication system, and an apparatus therefor. 2. Description of the Related Art Channel coding /

The present embodiment relates to a channel coding / decoding method and apparatus therefor in an OFDM-based wireless communication system.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

Many wireless communication technologies have been proposed as candidates for high-speed mobile communication. Of these, Orthogonal Frequency Division Multiplexing (OFDM) is a next generation wireless communication technology to be applied in most future wireless communication technologies.

In general, various channel coding / decoding methods are used in OFDM. For example, in OFDM, channel coding / decoding schemes such as convolutional codes (CC), convolutional turbo codes (CTC), turbo codes (TC), and low density parity check (LDPC) can be applied. However, in order to transmit encrypted output data having a size larger than that of input data by applying a general channel encoding method, the data clock rate must be increased.

Therefore, the present invention proposes a channel encoding method and a channel decoding method for transmitting output data of an increased size than input data by applying the same clock rate.

The present embodiment is a channel encoding / decoding method in an OFDM-based wireless communication system for adding and encrypting zero bits in channel coding in a transmitter of an OFDM and removing zero bits added in a channel decoding in a receiver of OFDM, There is a main purpose in providing a device.

According to an aspect of the present invention, there is provided an apparatus for performing channel coding in a transmitter of an Orthogonal Frequency Division Multiplexing (OFDM) based wireless communication system, the apparatus comprising: a receiver for verifying the size of an input packet and padding a specific bit A first data packet generating unit for generating a data packet having a size of the input packet; A first block data dividing unit dividing the data packet in parallel to generate a plurality of block data; A first bit padding unit for padding a zero bit to each of the plurality of block data so that each of the plurality of block data can be encoded; An encoding unit encoding each of the zero-padded block data to generate a parity bit; A parity combiner for combining the block data and the parity bits to generate a plurality of channel coding data; And a first serial converter for generating an output packet by serial-converting the plurality of channel coding data and forming a plurality of subcarriers based on the output packet. do.

According to another aspect of the present invention, there is provided a method of performing channel coding in a transmitter of an OFDM-based wireless communication system, the method comprising: checking a size of an input packet, padding a specific bit to input MAC data, A first data packet generation step of generating a data packet having a packet size; A first block data dividing step of dividing the data packet in parallel to generate a plurality of block data; A first zero bit padding step of padding each of the plurality of block data with zero bits so that each of the plurality of block data can be encoded; A coding step of coding each of the zero-padded block data to generate a parity bit; A parity combining step of generating a plurality of channel coding data by combining each of the block data and the parity bits; And a first serial conversion step of serial-converting the plurality of channel coding data to generate an output packet, and forming a plurality of subcarriers based on the output packet.

According to another aspect of the present invention, there is provided an apparatus for performing channel decoding in a receiver of an OFDM-based wireless communication system, the apparatus comprising: a receiver for combining a plurality of modulation data received from a transmitter to generate a data packet by padding a specific bit A second data packet generator; A second block data dividing unit dividing the data packet in parallel to generate a plurality of block data; A second bit padding unit for padding each of the plurality of block data with zero bits so that each of the plurality of block data can be decoded; A decoding unit for decoding each of the zero bit padded block data to remove parity bits included in the block data to generate decoded data; A bit removing unit for removing a zero bit included in each of the decoded data from which the parity bit is removed to generate a plurality of MAC data; And a second serial converter for serial-converting the plurality of MAC data to generate an output packet, and outputting the generated output packet.

According to another aspect of the present invention, there is provided a method of performing channel decoding in a receiver of an OFDM-based wireless communication system, the method comprising the steps of: generating a data packet by padding a specific bit in a reception packet combining a plurality of modulation data received from a transmitter A second data packet generation process; A second block data dividing step of dividing the data packet in parallel to generate a plurality of block data; A second zero bit padding step of padding each of the plurality of block data with zero bits so that each of the plurality of block data is decodable; Decoding the zero-padded block data to generate decoded data by removing parity bits included in the block data; A bit removing step of removing a zero bit included in each of the decoded data from which the parity bit is removed to generate a plurality of MAC data; And a second serial conversion step of serial-converting the plurality of MAC data to generate an output packet, and outputting the generated output packet.

As described above, according to the present embodiment, by adding zero bits at the time of channel coding, it is possible to generate encrypted data of an increased size at the same clock rate. In addition, the OFDM transmitter has an effect of increasing the data transmission rate by increasing the number of subcarriers included in one channel.

1 is a block diagram schematically illustrating a configuration of a transmitter in an OFDM-based wireless communication system according to the present embodiment.
2 is a block diagram schematically illustrating the configuration of a receiver in an OFDM-based wireless communication system according to the present embodiment.
3 is a flowchart illustrating a channel coding method of a transmitter in an OFDM-based wireless communication system according to an embodiment of the present invention.
4 is a flowchart illustrating a channel decoding method of a transmitter in an OFDM-based wireless communication system according to an embodiment of the present invention.
5A and 5B are exemplary diagrams for explaining a channel encoding and decoding operation according to the first embodiment of the present invention.
6A and 6B are exemplary diagrams for explaining a channel encoding and decoding operation according to a second embodiment of the present invention.
7A and 7B are diagrams for explaining a channel encoding and decoding operation according to a third embodiment of the present invention.

Hereinafter, the present embodiment will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a configuration of transmission in an OFDM-based wireless communication system according to the present embodiment.

The transmitter 100 of the wireless communication system according to the present embodiment includes a first controller 110, a first data packet generator 120, a first block data divider 130, a first bit padding unit 140, A parity combiner 160, a first serializer 170, a modulated data generator 180, and an OFDM transmitter 190. The encoder 150, the parity combiner 160, the first serializer 170,

The transmitter 100 performs the operation of transmitting the wideband data to the receiver 200. The transmitter 100 may be a Baseband Unit (BBU) or a Remote Radio Header (RRH). In other words, the transmitter 100 may be the BBU in the downstream (downlink), and the transmitter 100 may be the RRH in the upstream (uplink).

The transmitter 100 transmits broadband data based on OFDM (Orthogonal Frequency Division Multiplexing) to the receiver 200. However, the present invention is not limited thereto. If the transmitter 100 can transmit data using a subcarrier, It can be applied in any way.

The first control unit 110 controls the overall operation related to the transmitter 100. For example, the first control unit 110 may determine the size of an input packet that can be input to the first block data division unit 130, or set various sizes of specific bits, zero bits, and the like.

Also, the first controller 110 determines a clock rate for data transmission of the transmitter 100. The first control unit 110 according to the present embodiment may be configured such that the MAC data received from the first data packet generation unit 120 of the transmitter 100 and the output packet output from the modulation data generation unit 180 have different sizes The same clock rate can be set.

The first data packet generating unit 120 generates a data packet by padding a specific bit to MAC data acquired from a MAC (Media Access Control) layer. In other words, the first data packet generation unit 120 checks the size of the input packet that can be input to the first block data division unit 130, and paddes a specific bit to the MAC data so as to correspond to the size of the input packet, Lt; RTI ID = 0.0 > of < / RTI > Here, the specific bit is preferably a zero bit for converting the size of the MAC data into the size of the input packet, but is not limited thereto. The size of the input packet may be the size of a single packet, but may be the size of a combined packet in which a plurality of packets are connected in series.

The first data packet generator 120 determines a difference value obtained by subtracting the size of the MAC data from the size of a predetermined input packet as the size (number of bits) of a specific bit to be padded to the MAC data. Here, the MAC data may be the size of a CPRI (Common Public Radio Interface) frame, and the CPRI frame may be a CPRI option 1 basic frame having a size of 128 bits, but not necessarily limited thereto, An optional 2 frames, a CPRI option 3 frame having a size of 512 bits, a CPRI option 4 frame having a size of 640 bits, and a CPRI option 5 frame having a size of 1024 bits. .

The first block data dividing unit 130 divides the data packet in parallel to generate a plurality of block data. The first block data divider 130 divides the data packet into a predetermined size. Here, the first block data division unit 130 may divide the data packet so that the same number of block data as the multiple of the frame rate of the input packet received from the first data packet generation unit 120 is generated. On the other hand, when the input packet received from the first data packet generating unit 120 includes a plurality of packets, the first block data dividing unit 130 divides the data The packet can be divided.

The first bit padding unit 140 pads each of the plurality of block data with a zero bit or predetermined padding data. Here, the zero bit means a bit of a predetermined size composed of 0, and the padding data means a bit of a predetermined size having a specific value. In other words, the first bit padding unit 140 paddes a zero bit of a predetermined size such that each of the plurality of block data becomes a size that can be encoded by the encoding unit 150. [ Here, the zero bit of a predetermined size is preferably a predetermined size, but is not limited thereto, and may be a zero bit of the calculated size after checking the size of the block data. For example, in the case where the size that can be encoded by the encoding unit 150 is 239 bits and the size of each of the block data is 232 bits, the first bit padding unit 140 converts the zero bits of 7 bits into a plurality of block data Lt; / RTI >

The encoding unit 150 generates a parity bit by encoding each of a plurality of block data padded with zero bits. The encoding unit 150 according to the present embodiment can encode each of a plurality of block data using a Reed Solomon (RS) code scheme, but the present invention is not limited thereto. The encoding unit 150 may be implemented as one of code schemes have. For example, the encoding unit 150 may receive block data having a size of 239b and encode the block data to generate parity bits having a size of 16b. Here, the size of the parity bits is preferably a difference value obtained by subtracting the size of data necessary for decoding from the size of data required for decoding.

The parity combining unit 160 combines each of the plurality of block data obtained from the first block data dividing unit 130 and the parity bits generated in the encoding unit 150 to generate a plurality of channel coding data. The first serial converter 170 converts a plurality of channel coding data into serial data to generate an output packet, and transmits the generated output packet to the modulation data generator 180.

The modulation data generation unit 180 acquires an output packet from the first serial conversion unit 170, removes a specific bit included in the output packet, and generates a plurality of modulation data. The modulation data generation section 180 transmits a plurality of modulated data to the OFDM transmitter 190. [ The plurality of modulated data may be data modulated by Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (16QAM), 64QAM, or the like.

The OFDM transmitter 190 maps a plurality of modulated data to a subcarrier. The OFDM transmitter 190 processes the signal mapped to the subcarrier by inverse Fast Fourier Tramsform (IFFT) to output sample data in a time domain, adds a CP (Cyclic Prefix) to the sample data, And transmits the wideband data obtained by converting the OFDM symbol generated after generating the symbol to the analog signal to the receiver 200.

2 is a block diagram schematically illustrating the configuration of a receiver in an OFDM-based wireless communication system according to the present embodiment.

The receiver 200 of the wireless communication system according to the present embodiment includes an OFDM receiver 210, a second control unit 220, a subcarrier acquisition unit 230, a second data packet generation unit 240, A second bit padding unit 260, a decoding unit 270, a bit removing unit 280, a second serial converting unit 290, and a data transmitting unit 292.

The receiver 200 performs the operation of receiving the wideband data from the transmitter 110. The receiver 200 may be a BBU or an RRH. In other words, the receiver 200 may be the RRH for the downstream (downlink), and the receiver 200 may be the BBU for the upstream (uplink).

Although the receiver 200 is described as receiving broadband data from the transmitter 110 based on OFDM, the receiver 200 is not necessarily limited to this. However, if the receiver 200 can receive data using a subcarrier, It is possible.

The OFDM receiver 210 receives the wideband data from the transmitter 100 and transmits a plurality of modulated data obtained by modulating the received wideband data to the subcarrier acquiring unit 230. In other words, the OFDM receiver 210 receives the wideband data, converts it into a digital signal, removes the guard interval (CP) of the converted OFDM symbol, performs FFT (Fast Fourier Transform) To the carrier acquisition unit 230.

The second control unit 220 controls the overall operation related to the receiver 200. For example, the second controller 220 can determine the size of an input packet that can be input to the second block data divider 250, or set various sizes of specific bits, zero bits, and the like.

In addition, the second controller 220 determines a clock rate for receiving data from the receiver 200. The second controller 220 according to the present embodiment is different in the size of the received packet received from the second data packet generator 240 of the receiver 200 and the size of the output packet output from the data transmitter 292 The same clock rate can be set.

The subcarrier acquiring unit 230 acquires a plurality of modulation data from the OFDM receiver 210. The subcarrier acquiring unit 230 combines a plurality of modulated data into one received packet and transmits it to the second data packet generating unit 240.

The second data packet generator 240 generates a data packet by padding a specific bit in the received packet. In other words, the second data packet generator 240 checks the size of the input packet that can be input to the second block data divider 250, and paddes a specific bit to the received packet so as to correspond to the size of the input packet. And generates a data packet having the same size as the size of the input packet. Here, the specific bit is preferably a zero bit for converting the size of the received packet into the size of the input packet, but is not limited thereto. The size of the input packet may be the size of a single packet, but may be the size of a combined packet in which a plurality of packets are connected in series.

The second data packet generator 240 determines a difference value obtained by subtracting the size of the received packet from the size of the predetermined input packet as the size (number of bits) of a specific bit to be padded in the received packet. Here, the received packet may be the size of a CPRI (Common Public Radio Interface) frame, and the CPRI frame may be a CPRI option 1 basic frame having a size of 128 bits, but the present invention is not limited thereto. An optional 2 frames, a CPRI option 3 frame having a size of 512 bits, a CPRI option 4 frame having a size of 640 bits, and a CPRI option 5 frame having a size of 1024 bits. .

The second block data division unit 250 divides the data packet received from the second data packet generation unit 240 in parallel to generate a plurality of block data. Here, each of the plurality of block data includes a parity bit encoded by the transmitter 100.

The second block data division unit 250 divides the data packet into a predetermined size. Here, the second block data division unit 250 may divide the data packet so that the same number of block data as the multiple of the frame rate of the data packet received from the second data packet generation unit 240 is generated. On the other hand, when the data packet received from the second data packet generating unit 240 includes a plurality of packets, the second block data dividing unit 250 divides the data The packet can be divided.

The second bit padding unit 260 pads each of the plurality of block data with a zero bit. In other words, the second bit padding unit 260 pads the zero bits of a predetermined size so that each of the plurality of block data can be decoded by the decoding unit 270. [ Here, the zero bit of a predetermined size is preferably a predetermined size, but is not limited thereto, and may be a zero bit of the calculated size after checking the size of the block data. For example, if the size that can be decoded by the decoding unit 270 is 255 bits, and the size of each of the block data is 248 bits, the second bit padding unit 260 multiplies the 7-bit zero bits into a plurality of block data Lt; / RTI >

The decoding unit 270 decodes each of the plurality of block data padded with zero bits to remove the parity bits. The decoding unit 270 generates channel decoding data from which parity bits are removed. The decoding unit 270 may decode each of a plurality of block data using a Reed Solomon (RS) code scheme, but the present invention is not limited thereto. The decoding unit 270 may be implemented as one of code schemes that operate on a block basis.

The bit remover 280 removes zero bits or predetermined padding data included in each of the channel decoded data from which the parity bit is removed. The second serial converter 290 converts a plurality of channel decoded data to serial, generates an output packet, and transmits the generated output packet to the data transmitter 292.

The data transmission unit 292 acquires an output packet from the second serial conversion unit 290 and transmits the MAC data from which the specific bit included in the output packet is removed to a connected terminal (not shown) or a backhaul server (not shown) Lt; / RTI >

3 is a flowchart illustrating a channel coding method of a transmitter in an OFDM-based wireless communication system according to an embodiment of the present invention.

The first data packet generating unit 120 checks the size of the input packet that can be input to the first block data dividing unit 130 and paddes a specific bit to the MAC data so as to correspond to the size of the input packet, And generates a data packet of the same size (S310). Here, the specific bit may be a zero bit for converting the size of the MAC data into the size of the input packet.

The first block data divider 130 divides the data packet in parallel to generate a plurality of block data (S320). Here, the first block data division unit 130 may divide the data packet so that the same number of block data as the multiple of the frame rate of the input packet received from the first data packet generation unit 120 is generated.

The first bit padding unit 140 pads each of the plurality of block data with a zero bit (S330). In other words, the first bit padding unit 140 paddes a zero bit of a predetermined size such that each of the plurality of block data becomes a size that can be encoded by the encoding unit 150. [

The encoding unit 150 generates a parity bit by encoding each of a plurality of block data padded with zero bits (S340). Here, it is preferable that the encoding unit 150 encodes each of a plurality of block data using a Reed Solomon (RS) code scheme.

The parity combining unit 160 generates a plurality of channel coding data by combining the plurality of block data obtained from the first block data dividing unit 130 and the parity bits generated by the encoding unit 150 (S350) .

The first serial converter 170 converts a plurality of channel coding data to serial, generates an output packet, and transmits the generated output packet to the modulation data generator 180 (S360).

The modulation data generation unit 180 acquires an output packet from the first serial conversion unit 170, removes a specific bit included in the output packet, and generates a plurality of modulation data (S370).

The OFDM transmitter 190 transmits the wideband data including the plurality of subcarriers to the receiver 200 using the plurality of modulation data (S380).

4 is a flowchart illustrating a channel decoding method of a transmitter in an OFDM-based wireless communication system according to an embodiment of the present invention.

The OFDM receiver 210 receives the wideband data from the transmitter 100 and transmits a plurality of modulated data obtained by modulating the received wideband data to the subcarrier acquisition unit 230 (S410).

The subcarrier acquisition unit 230 acquires a plurality of modulation data from the OFDM receiver 210, combines the plurality of modulation data into one reception packet, and transmits the combined reception data to the second data packet generation unit 240 (S420).

The second data packet generation unit 240 checks the size of the input packet that can be input to the second block data division unit 250 and paddes a specific bit to the received packet so as to correspond to the size of the input packet, A data packet having the same size as the size of the data packet is generated (S430). Here, the specific bit may be a zero bit for converting the size of the received packet into the size of the input packet.

The second block data divider 250 divides the data packet in parallel to generate a plurality of block data (S440). Here, each of the plurality of block data includes a parity bit encoded by the transmitter 100.

The second bit padding unit 260 pads each of the plurality of block data with a zero bit (S450). In other words, the second bit padding unit 260 pads the zero bits of a predetermined size so that each of the plurality of block data can be decoded by the decoding unit 270. [ Here, the zero bit of a predetermined size is preferably a predetermined size, but is not limited thereto, and may be a zero bit of the calculated size after checking the size of the block data.

The decoding unit 270 decodes each of the plurality of block data padded with zero bits to remove the parity bits (S460). The decoding unit 270 generates channel decoding data from which parity bits are removed. The decoding unit 270 can decode each of a plurality of block data using a Reed Solomon (RS) code scheme.

The bit removal unit 280 removes the zero bits included in the channel decoded data from which the parity bits are removed (S470). The second serial converter 290 converts the plurality of channel decoded data to serial, generates an output packet, and transmits the generated output packet to the data transmitter 292 (S480).

The data transmission unit 292 acquires an output packet from the second serial conversion unit 290 and transmits the MAC data from which the specific bit included in the output packet is removed to a connected terminal (not shown) or a backhaul server (not shown) (S490).

5A and 5B are exemplary diagrams for explaining a channel encoding and decoding operation according to the first embodiment of the present invention.

FIG. 5A shows an operation of channel-coding MAC data of 512b size, and FIG. 5b shows an operation of channel decoding a received packet of size 512b.

Hereinafter, the operation of channel-encoding MAC data based on the contents shown in FIG. 5A will be described.

If it is determined that the size of the input packet that can be input to the first block data division unit 130 is 696b, the first data packet generation unit 120 paddes the specific bit of 184b to the MAC data of size 512b, And generates a data packet. Here, a certain bit of the size of 184b means a zero bit of size 184b.

The first block data dividing unit 130 divides the data packet of size 696b into 232b sizes to generate three pieces of block data. Here, if the first block data division unit 130 receives a data packet of size 696b from the first data packet generation unit 120 at an increased frame rate of 3 times, the frame rate is multiplied by a multiple It can be divided into the same three block data.

The first bit padding unit 140 paddes each of the three block data with zero bits of size 7b.

The encoding unit 150 encodes each of the 239b-sized block data of which 7b-sized zero bits are padded to generate parity bits of 16b-size. Here, it is preferable that the encoding unit 150 is an RS (239, 255) encoding unit.

The parity combiner 160 combines each of the block data having the size of 232b obtained from the first block data dividing unit 130 with the parity bits having the size of 16b generated in the encoding unit 150 to form three 248b sizes Lt; / RTI >

The first serializer 170 converts the channel coding data having three sizes of 248b to serial, generates an output packet having a size of 744b, and transmits the generated output packet having the size of 744b to the modulation data generator 180 .

The modulation data generation unit 180 obtains the output packet of the size 744b from the first serial conversion unit 170, removes the specific bit of the size 184b included in the output packet of the size 744b, Modulated data. The modulation data generation unit 180 transmits the plurality of modulation data to the OFDM transmitter 190 so that the wideband data is transmitted to the receiver 200.

Hereinafter, the operation of channel decoding the received packet will be described based on the contents shown in FIG. 5B.

The OFDM receiver 210 receives the wideband data from the transmitter 100 and transmits a plurality of modulated data obtained by modulating the received wideband data to the subcarrier acquiring unit 230. The subcarrier acquiring unit 230 acquires a plurality of modulation data from the OFDM receiver 210, combines the plurality of modulation data into one reception packet having a size of 560b, and transmits the combined reception data to the second data packet generating unit 240 .

When it is determined that the size of the input packet that can be input to the second block data division unit 250 is 744b, the second data packet generation unit 240 paddes a specific bit of 184b in the received packet of size 560b, And generates a data packet. Here, a certain bit of the size of 184b means a zero bit of size 184b.

The second block data division unit 250 divides the 744b-sized data packet into 248b sizes to generate 3 pieces of block data. Here, each of the three pieces of block data includes a parity bit having a size of 16b.

The second bit padding unit 260 paddes each of the three block data with zero bits of size 7b. The second bit padding unit 260 paddes the zero bits of the size 7b to make each block data 255b that is a size that can be decoded by the decoding unit 270. [

The decoding unit 270 decodes each of the 255b-sized block data of which the zeroth bit of the 7b size is padded, and removes the 16b-sized parity bit to generate channel decoding data. Here, it is preferable that the decoding unit 270 is an RS (239, 255) decoding unit.

The bit removal unit 280 removes the zeroth bit of the 7b size included in each of the 239b-sized channel decoded data from which the parity bit is removed, thereby generating 232b-sized channel decoded data.

The second serial converter 290 converts the channel decoded data having the size of 232b to serial, generates an output packet of size 696b, and transmits the generated output packet of size 696b to the data transmitter 292. [

The data transmitting unit 292 obtains the output packet of size 696b from the second serial converter 290, removes the specific bit of size 184b included in the output packet of size 696b, and transmits the MAC data of size 512b to the connected terminal or To the backhaul server.

6A and 6B are exemplary diagrams for explaining a channel encoding and decoding operation according to a second embodiment of the present invention.

FIG. 6A shows an operation of channel-coding 1024b MAC data, and FIG. 6B shows an operation of channel decoding a received packet having a size of 1024b.

Hereinafter, an operation of channel-encoding MAC data based on the contents shown in FIG. 6A will be described.

When it is determined that the size of the input packet that can be input to the first block data divider 130 is 1160b, the first data packet generator 120 paddes a specific bit of 136b in the MAC data of 1024b size, And generates a data packet. Here, a specific bit of the size 136b means a zero bit of size 184b.

The first block data division unit 130 divides the data packet of size 1160b into the size of 232b to generate five pieces of block data. Here, if the first block data division unit 130 receives the 1160b-sized data packet from the first data packet generation unit 120 at an increased frame rate of 5 times, the first block data division unit 130 may multiply the frame rate by a multiple It can be divided into the same five block data.

The first bit padding unit 140 paddes each of the five block data with zero bits of size 7b.

The encoding unit 150 encodes each of the 239b-sized block data of which 7b-sized zero bits are padded to generate parity bits of 16b-size. Here, it is preferable that the encoding unit 150 is an RS (239, 255) encoding unit.

The parity combining unit 160 combines each of the block data having the size of 232b obtained from the first block data dividing unit 130 with the parity bits having the size of 16b generated in the encoding unit 150 to form five 248b sizes Lt; / RTI >

The first serializer 170 converts the channel coding data having the size of 5 248b to serial, generates an output packet having a size of 1240b, and transmits the generated output packet having the size of 1240b to the modulated data generator 180 .

The modulation data generation unit 180 obtains the output packet of the size of 1240b from the first serial conversion unit 170, removes the specific bit of the size 136b included in the output packet of the size of 1240b, Modulated data. The modulation data generation unit 180 transmits the plurality of modulation data to the OFDM transmitter 190 so that the wideband data is transmitted to the receiver 200.

Hereinafter, the operation of channel decoding a received packet will be described based on the contents shown in FIG. 6B.

The OFDM receiver 210 receives the wideband data from the transmitter 100 and transmits a plurality of modulated data obtained by modulating the received wideband data to the subcarrier acquiring unit 230. The subcarrier acquiring unit 230 acquires a plurality of modulated data from the OFDM receiver 210, combines the plurality of modulated data into one reception packet having a size of 1104b, and transmits the combined reception data to the second data packet generating unit 240 .

When it is determined that the size of the input packet that can be input to the second block data division unit 250 is 1240b, the second data packet generation unit 240 paddes a specific bit of 136b in the received packet of size 1104b, And generates a data packet. Here, a specific bit of the size 136b denotes a zero bit of the size 136b.

The second block data division unit 250 divides the data packet of the size 1240b into the size of 248b to generate five pieces of block data. Here, each of the five pieces of block data includes a parity bit having a size of 16b.

The second bit padding unit 260 paddes each of the five block data with zero bits of size 7b. The second bit padding unit 260 paddes the zero bits of the size 7b to make each block data 255b that is a size that can be decoded by the decoding unit 270. [

The decoding unit 270 decodes each of the 255b-sized block data of which the zeroth bit of the 7b size is padded, and removes the 16b-sized parity bit to generate channel decoding data. Here, it is preferable that the decoding unit 270 is an RS (239, 255) decoding unit.

The bit removal unit 280 removes the zeroth bit of the 7b size included in each of the 239b-sized channel decoded data from which the parity bit is removed, thereby generating 232b-sized channel decoded data.

The second serializer 290 converts the channel decoded data having the size of 232 bits to serial, generates an 1160b output packet, and transmits the generated 1160b output packet to the data transmitter 292.

The data transmission unit 292 obtains the output packet of size 1160b from the second serial conversion unit 290, removes the specific bit of size 136b included in the output packet of size 1160b, and transmits the MAC data of size 1024b to the connected terminal or To the backhaul server.

7A and 7B are diagrams for explaining a channel encoding and decoding operation according to a third embodiment of the present invention.

FIG. 7A shows an operation for channel-coding 1024b MAC data, and FIG. 7B shows an operation for channel decoding a received packet having a size of 1024b.

Hereinafter, an operation of channel-encoding MAC data based on the contents shown in FIG. 7A will be described.

When it is determined that the size of the input packet that can be input to the first block data divider 130 is 2088b, the first data packet generator 120 paddes a specific bit of 40b to the MAC data of 2048b size, And generates a data packet. Here, a specific bit of size 40b means a zero bit of size 40b.

The first block data dividing unit 130 divides the data packet of the size 2088b into the size 232b to generate nine pieces of block data. Here, if the first block data division unit 130 receives the data packet of the size 2088b from the first data packet generation unit 120 at a frame rate 9 times increased, It can be divided into the same nine block data.

The first bit padding unit 140 pads each of the nine block data with zero bits of size 7b.

The encoding unit 150 encodes each of the 239b-sized block data of which 7b-sized zero bits are padded to generate parity bits of 16b-size. Here, it is preferable that the encoding unit 150 is an RS (239, 255) encoding unit.

The parity combining unit 160 combines each of the block data having the size of 232 bits obtained from the first block data dividing unit 130 with the parity bits having the size of 16b generated in the encoding unit 150, Lt; / RTI >

The first serializer 170 converts the channel coding data having the size of 9 248b to serial, generates an output packet of size 2232b, and transmits the generated output packet of size 2232b to the modulation data generator 180 .

The modulation data generation unit 180 obtains the output packet of the size 2232b from the first serial conversion unit 170, removes the specific bit of the size 40b included in the output packet of the size 2232b, Modulated data. The modulation data generation unit 180 transmits the plurality of modulation data to the OFDM transmitter 190 so that the wideband data is transmitted to the receiver 200.

Hereinafter, the operation of channel decoding the received packet will be described based on the contents shown in FIG. 7B.

The OFDM receiver 210 receives the wideband data from the transmitter 100 and transmits a plurality of modulated data obtained by modulating the received wideband data to the subcarrier acquiring unit 230. The subcarrier acquiring unit 230 acquires a plurality of modulated data from the OFDM receiver 210, combines the plurality of modulated data into one reception packet having a size of 2192b, and transmits the combined reception data to the second data packet generating unit 240 .

When it is determined that the size of the input packet that can be input to the second block data division unit 250 is 2232b, the second data packet generation unit 240 paddes a specific bit of 40b into the received packet of size 2192b, And generates a data packet. Here, a specific bit of size 40b means a zero bit of size 40b.

The second block data division unit 250 divides the data packet of the size 2232b into the size of 248b to generate nine pieces of block data. Here, each of the nine pieces of block data includes a parity bit having a size of 16b.

The second bit padding unit 260 paddes each of the nine block data with zero bits of size 7b. The second bit padding unit 260 paddes the zero bits of the size 7b to make each block data 255b that is a size that can be decoded by the decoding unit 270. [

The decoding unit 270 decodes each of the 255b-sized block data of which the zeroth bit of the 7b size is padded, and removes the 16b-sized parity bit to generate channel decoding data. Here, it is preferable that the decoding unit 270 is an RS (239, 255) decoding unit.

The bit removal unit 280 removes the zeroth bit of the 7b size included in each of the 239b-sized channel decoded data from which the parity bit is removed, thereby generating 232b-sized channel decoded data.

The second serial converter 290 converts the channel decoded data having the size of 232 bits to serial, generates an output packet having a size of 2088b, and transmits the generated output packet having the size of 2088b to the data transmitter 292.

The data transfer unit 292 obtains the output packet of the size of 2088b from the second serial converter 290, removes the specific bit of the size 40b included in the output packet of the size of 2088b, To the backhaul server.

The foregoing description is merely illustrative of the technical idea of the present embodiment, and various modifications and changes may be made to those skilled in the art without departing from the essential characteristics of the embodiments. Therefore, the present embodiments are to be construed as illustrative rather than restrictive, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

100: Transmitter
110: first control unit 120: first data packet generation unit
130: first block data division unit 140: first bit padding unit
150: encoding unit 160: parity combining unit
170: First serial converter 180: Modulation data generator
190: OFDM transmitter
200: receiver
210: OFDM receiver 220:
230: Subcarrier acquisition unit 240: Second data packet generation unit
250: second block data division unit 260: second bit padding unit
270: decoding unit 280: bit removal
290: second serial converter 292:

Claims (18)

  1. An apparatus for performing channel coding in a transmitter of an OFDM (Orthogonal Frequency Division Multiplexing) based wireless communication system,
    A first data packet generation unit for checking the size of an input packet and generating a data packet having a size of the input packet by padding a specific bit to input MAC data;
    A first block data dividing unit dividing the data packet in parallel to generate a plurality of block data;
    A first bit padding unit for padding a zero bit to each of the plurality of block data so that each of the plurality of block data can be encoded;
    An encoding unit encoding each of the zero-padded block data to generate a parity bit;
    A parity combiner for combining the block data and the parity bits to generate a plurality of channel coding data; And
    A first serial-to-serial conversion unit for serial-converting the plurality of channel coding data to generate an output packet, and forming a plurality of modulated data based on the output packet,
    Wherein the channel coding unit includes:
  2. The method according to claim 1,
    Wherein the first data packet generator comprises:
    And checks the size of the input packet that can be input to the first block data unit and paddes the specific bit to the MAC data so as to correspond to the size of the input packet.
  3. The method according to claim 1,
    The specific bit may be,
    And a zero bit for converting the size of the MAC data into a size equal to the size of the input packet.
  4. The method according to claim 1,
    Wherein the first block data division unit comprises:
    Wherein the data packet is divided so that the number of block data equal to a multiple of a frame rate of an input packet received from the first data packet generation unit is generated.
  5. The method according to claim 1,
    Wherein the first bit padding unit comprises:
    And padding each of the plurality of block data with the zero bit having a predetermined size.
  6. The method according to claim 1,
    Wherein the first bit padding unit comprises:
    And padding each of the plurality of block data with the zero bit of the calculated size based on the size of the block data.
  7. The method according to claim 1,
    Wherein the encoding unit comprises:
    And generates the parity bit corresponding to a difference value obtained by subtracting the size of data necessary for encoding from the size of data necessary for decoding.
  8. 8. The method of claim 7,
    Wherein the encoding unit comprises:
    And generates the parity bits using a code scheme operating on a block-by-block basis.
  9. The method according to claim 1,
    And a first controller configured to set a clock rate of the MAC data and the output packet, wherein the first controller receives the MAC data received from the first data packet generator, And sets the same clock rate in the output packet output from the output unit.
  10. A method for performing channel coding in a transmitter of an OFDM-based wireless communication system,
    A first data packet generation step of checking the size of the input packet and generating a data packet having a size of the input packet by padding a specific bit to the input MAC data;
    A first block data dividing step of dividing the data packet in parallel to generate a plurality of block data;
    A first zero bit padding step of padding each of the plurality of block data with zero bits so that each of the plurality of block data can be encoded;
    A coding step of coding each of the zero-padded block data to generate a parity bit;
    A parity combining step of generating a plurality of channel coding data by combining each of the block data and the parity bits; And
    A first serial conversion step of serial-converting the plurality of channel coding data to generate an output packet, and forming a plurality of subcarriers based on the output packet,
    Wherein the channel coding method comprises the steps of:
  11. An apparatus for performing channel decoding in a receiver of an OFDM-based wireless communication system,
    A second data packet generating unit for generating a data packet by padding a specific bit in a reception packet obtained by combining a plurality of modulation data received from a transmitter;
    A second block data dividing unit dividing the data packet in parallel to generate a plurality of block data;
    A second bit padding unit for padding each of the plurality of block data with zero bits so that each of the plurality of block data can be decoded;
    A decoding unit for decoding each of the zero bit padded block data to remove parity bits included in the block data to generate decoded data;
    A bit removing unit for removing a zero bit included in each of the decoded data from which the parity bit is removed to generate a plurality of MAC data; And
    A second serial conversion unit for serial-converting the plurality of MAC data to generate an output packet, and outputting the generated output packet;
    And a channel decoding unit for decoding the channel data.
  12. 12. The method of claim 11,
    Wherein the second data packet generation unit comprises:
    And checks the size of an input packet that can be input to the second block data unit and paddes the specific bit to the received packet so as to correspond to the size of the input packet.
  13. 13. The method of claim 12,
    The specific bit may be,
    And a zero bit for converting the size of the received packet to a size equal to the size of the input packet.
  14. 12. The method of claim 11,
    Wherein the second bit padding unit comprises:
    And padding each of the plurality of block data with the zero bit having a predetermined size.
  15. 12. The method of claim 11,
    Wherein the second bit padding unit comprises:
    And padding each of the plurality of block data with the zero bit of the calculated size based on the size of the block data.
  16. 12. The method of claim 11,
    Wherein the decoding unit comprises:
    And removes the generated parity bit when encoding.
  17. 17. The method of claim 16,
    Wherein the decoding unit comprises:
    And removes the parity bits using a code scheme that operates on a block-by-block basis.
  18. A method of performing channel decoding in a receiver of an OFDM-based wireless communication system,
    A second data packet generation step of generating a data packet by padding a specific bit in a reception packet obtained by combining a plurality of modulation data received from a transmitter;
    A second block data dividing step of dividing the data packet in parallel to generate a plurality of block data;
    A second zero bit padding step of padding each of the plurality of block data with zero bits so that each of the plurality of block data is decodable;
    Decoding the zero-padded block data to generate decoded data by removing parity bits included in the block data;
    A bit removing step of removing a zero bit included in each of the decoded data from which the parity bit is removed to generate a plurality of MAC data; And
    A second serial conversion process for serial-converting the plurality of MAC data to generate an output packet, and outputting the generated output packet;
    The channel decoding method comprising the steps of:
KR1020160005062A 2016-01-15 2016-01-15 Method and Apparatus for Channel Coding/Decoding in Wireless Communication System Based on Orthogonal Frequency Division Multiplexing KR20170086145A (en)

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US7698623B2 (en) * 2004-08-13 2010-04-13 David Hedberg Systems and methods for decreasing latency in a digital transmission system
US7397400B2 (en) * 2005-12-02 2008-07-08 Viasat, Inc. Variable length data encapsulation and encoding
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