WO2017122861A1 - Method for encoding/decoding channel in ofdm-based wireless communication system, and device therefor - Google Patents

Abstract

Disclosed are a method for encoding/decoding a channel in an OFDM-based wireless communication system, and a device therefor. The present invention relates to a method for encoding/decoding a channel in an OFDM-based wireless communication system, and a device therefor, wherein an OFDM transmitter adds a zero bit to a channel and then encrypts the channel when encoding the channel, and an OFDM receiver removes an added zero bit from a channel and then decrypts the channel when decoding the channel.

Description

Channel encoding / decoding method in OFM-based wireless communication system and apparatus therefor

The present embodiment relates to a channel encoding / decoding method and an 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 a prior art.

Many wireless communication technologies have been proposed as candidates for high-speed mobile communication, and 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 methods such as Convolutional Codes (CC), Convolutional Turbo Codes (CTC), Turbo Codes (TC), and Low Density Parity Check (LDPC) may be applied. However, in order to transmit encrypted output data having an increased size than input data by applying a general channel encoding scheme, a clock rate of data must be increased.

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

In the present embodiment, a channel encoding / decoding method in an OFDM-based wireless communication system for adding and encrypting zero bits during channel encoding in an OFDM transmitter and removing zero bits added during channel decoding in an OFDM receiver and a method for the same The main purpose is to provide a device.

According to an aspect of the present embodiment, in an apparatus for performing channel encoding in a transmitter in an orthogonal frequency division multiplexing (OFDM) based wireless communication system, a size of an input packet is checked and a specific bit is padded on the input MAC data. A first data packet generator for generating a data packet having a size of the input packet; A first block data dividing unit dividing the data packets in parallel to generate a plurality of block data; A first bit padding unit configured to pad a zero bit to each of the plurality of block data so that each of the plurality of block data can be encoded; An encoder configured to generate parity bits by encoding each of the block data padded with the zero bits; A parity combiner for generating a plurality of channel coding data by combining the block data and the parity bit; And a first serial converter configured to serially convert the plurality of channel coding data to generate an output packet, and to form a plurality of subcarriers based on the output packet. do.

In addition, according to another aspect of the present embodiment, in a method for performing channel encoding in a transmitter of an OFDM-based wireless communication system, checking the size of an input packet and padding a specific bit to the input MAC data Generating a first data packet having a size of a packet; A first block data dividing step of dividing the data packets in parallel to generate a plurality of block data; A first zero bit padding process of padding zero bits to each of the plurality of block data so that each of the plurality of block data can be encoded; An encoding process of encoding each of the zero-bit padded block data to generate a parity bit; A parity combining process of generating a plurality of channel coding data by combining each of the block data and the parity bit; And a first serial conversion process of serially 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 embodiment, in the apparatus for performing channel decoding in a receiver of an OFDM-based wireless communication system, a data packet is generated by padding a specific bit into a received packet combining a plurality of modulated data received from a transmitter. A second data packet generator; A second block data dividing unit dividing the data packets in parallel to generate a plurality of block data; A second bit padding unit configured to pad zero bits to each of the plurality of block data so that each of the plurality of block data can be decodable; A decoder configured to decode each block data padded with the zero bits to remove the parity bits included in the block data to generate decrypted data; A bit remover configured to generate a plurality of MAC data by removing zero bits included in each of the decoded data from which the parity bits are removed; And a second serial converter configured to serially convert the plurality of MAC data to generate an output packet, and to output the generated output packet.

According to another aspect of the present embodiment, in a method of performing channel decoding in a receiver of an OFDM-based wireless communication system, a data packet is generated by padding a specific bit into a received packet combining a plurality of modulated data received from a transmitter. Generating a second data packet; A second block data dividing step of dividing the data packets in parallel to generate a plurality of block data; A second zero bit padding process of padding zero bits to each of the plurality of block data so that each of the plurality of block data is decodable; A decoding process of decoding each of the zero-bit padded block data to remove parity bits included in the block data to generate decrypted data; A bit removing step of generating a plurality of MAC data by removing zero bits included in each of the decoded data from which the parity bits are removed; And a second serial conversion process of serially 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 during channel encoding, encrypted data having an increased size can be generated at the same clock rate. In addition, there is an effect that the data transmission rate can be increased by increasing the number of subcarriers included in one channel in the OFDM transmitter.

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

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

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

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

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

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

7A and 7B are exemplary diagrams for describing 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 a 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 control unit 110, a first data packet generation unit 120, a first block data division unit 130, a first bit padding unit 140, The encoder 150 includes a parity combiner 160, a first serial converter 170, a modulated data generator 180, and an OFDM transmitter 190.

The transmitter 100 transmits broadband 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 a BBU for the downstream (downlink) and the transmitter 100 may be an RRH for the upstream (uplink).

Although the transmitter 100 is described as transmitting broadband data to the receiver 200 based on orthogonal frequency division multiplexing (OFDM), the transmitter 100 is not necessarily limited thereto, and the transmitter 100 may transmit data using a subcarrier. It can be applied in any way.

The first controller 110 controls the overall operation related to the transmitter 100. For example, the first controller 110 may determine the size of an input packet input to the first block data divider 130 or set the size of various specific bits, zero bits, and the like.

In addition, 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 has a different size from 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. The same clock rate can be set.

The first data packet generator 120 pads a specific bit into MAC data obtained from a media access control (MAC) layer to generate a data packet. In other words, the first data packet generator 120 checks the size of the input packet input to the first block data divider 130, and pads a specific bit in the MAC data so as to correspond to the size of the input packet. Create a data packet of the same size as. 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 necessarily limited thereto. The size of the input packet may be the size of one 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 generation unit 120 determines a difference value obtained by subtracting the size of the MAC data from the size of the preset input packet as the size (number of bits) of the specific bit padding on the MAC data. Here, the MAC data may be a size of a common public radio interface (CPRI) frame, the CPRI frame may be a CPRI Option 1 basic frame having a size of 128 bits, but is not necessarily limited to this, CPRI having a size of 256 bits CPRI Option 1 basic frame such as Option 2 frame, CPRI Option 3 frame with 512 bits, CPRI Option 4 frame with 640 bits, CPRI Option 5 frame with 1024 bits, etc. .

The first block data divider 130 divides the data packet in parallel to generate a plurality of block data. The first block data dividing unit 130 divides the data packet into a preset size. Here, the first block data dividing unit 130 may divide the data packet such that the same number of block data as the multiple of the frame rate of the input packet received from the first data packet generating unit 120 is generated. Meanwhile, when the input packet received from the first data packet generator 120 includes a plurality of packets, the first block data divider 130 generates data such that the same block data as the number of the plurality of packets is generated. You can split the packet.

The first bit padding unit 140 pads a zero bit or predetermined padding data to each of the plurality of block 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 pads zero bits having a predetermined size so that each of the plurality of block data becomes a size that can be encoded by the encoder 150. Here, the zero bit of the predetermined size is preferably a predetermined size, but is not necessarily limited thereto. The zero bit of the predetermined size may be zero bits of the calculated size after checking the size of the block data. For example, when the size that can be encoded by the encoder 150 is 239 bits, and the size of each block data is 232 bits, the first bit padding unit 140 may store the 7-bit zero bits each of the plurality of block data. Padding on

The encoder 150 encodes each of the plurality of block data padded with zero bits to generate a parity bit. The encoder 150 according to the present embodiment may encode each of a plurality of block data using a Reed Solomon (RS) code method, but is not necessarily limited thereto, and may be implemented as one of a code method operating in units of blocks. have. For example, the encoder 150 may receive block data having a size of 239b and encode the same to generate a parity bit having a size of 16b. Here, the size of the parity bit is preferably a difference value obtained by subtracting the size of data required for encoding from the size of data required for decoding.

The parity combiner 160 combines each of the plurality of block data obtained from the first block data divider 130 and each of the parity bits generated by the encoder 150 to generate a plurality of channel coding data. The first serial converter 170 converts the plurality of channel coding data into serial to generate an output packet, and transmits the generated output packet to the modulated data generator 180.

The modulated data generator 180 obtains an output packet from the first serial converter 170, removes a specific bit included in the output packet, and then generates a plurality of modulated data. The modulated data generator 180 transmits a plurality of modulated data to the OFDM transmitter 190. The plurality of modulation 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 outputs sample data in the time domain by performing IFFT (Inverse Fast Fourier Tramsform) operation on a signal mapped to a subcarrier, and adds a guard period (CP: Cyclic Prefix) to the sample data. After generating a symbol, wideband data obtained by converting the generated OFDM symbol into an analog signal is transmitted to the receiver 200.

2 is a block diagram schematically illustrating a 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 controller 220, a subcarrier obtainer 230, a second data packet generator 240, and a second block data portion. An installment unit 250, a second bit padding unit 260, a decoding unit 270, a bit removing unit 280, a second serial converter 290, and a data transmission unit 292 are included.

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

The receiver 200 is described as receiving broadband data from the transmitter 110 based on OFDM, but is not necessarily limited thereto. If the receiver 200 can receive data using a subcarrier, the receiver 200 may be applied in any manner. It is possible.

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

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

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

The subcarrier obtainer 230 obtains a plurality of modulated data from the OFDM receiver 210. The subcarrier obtainer 230 combines the plurality of modulated data into one received packet and transmits the received data to the second data packet generator 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 an input packet that can be input to the second block data divider 250, and pads a specific bit in the received packet so as to correspond to the size of the input packet. To generate a data packet of the same size as 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 necessarily limited thereto. The size of the input packet may be the size of one 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 generation unit 240 determines a difference value obtained by subtracting the size of the received packet from the size of the preset input packet as the size (number of bits) of the specific bit that pads the received packet. In this case, the received packet may be a size of a common public radio interface (CPRI) frame, and the CPRI frame may be a CPRI Option 1 basic frame having a size of 128 bits, but is not limited thereto, and a CPRI having a size of 256 bits. CPRI Option 1 base frame such as Option 2 frame, CPRI Option 3 frame with 512 bits, CPRI Option 4 frame with 640 bits, and CPRI Option 5 frame with 1024 bits. .

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

The second block data dividing unit 250 divides the data packet into a preset size. Here, the second block data dividing unit 250 may divide the data packet to generate the same number of block data as the multiple of the frame rate of the data packet received from the second data packet generating unit 240. Meanwhile, when the data packet received from the second data packet generator 240 includes a plurality of packets, the second block data divider 250 generates data such that the same block data as the number of the plurality of packets is generated. You can split the packet.

The second bit padding unit 260 pads a zero bit into each of the plurality of block data. In other words, the second bit padding unit 260 pads zero bits of a predetermined size such that each of the plurality of block data becomes a size decodable by the decoder 270. Here, the zero bit of the predetermined size is preferably a predetermined size, but is not necessarily limited thereto. The zero bit of the predetermined size may be zero bits of the calculated size after checking the size of the block data. For example, when the size that can be decoded by the decoding unit 270 is 255 bits, and the size of each block data is 248 bits, the second bit padding unit 260 may store a 7-bit size of zero bits, respectively. Padding on

The decoder 270 removes parity bits by decoding each of the plurality of block data padded with zero bits. The decoder 270 generates the channel decoding data from which the parity bit is removed. The decoder 270 may decode each of the plurality of block data using a Reed Solomon (RS) code method, but is not necessarily limited thereto. The decoder 270 may be implemented as one of code methods operating in units of blocks.

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

The data transmission unit 292 obtains an output packet from the second serial converter 290, and connects a terminal (not shown) or a backhaul server (not shown) to which MAC data from which a specific bit included in the output packet is removed is connected. To send.

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

The first data packet generator 120 checks the size of the input packet input to the first block data divider 130, and pads a specific bit in the MAC data so as to correspond to the size of the input packet. A data packet of the same size is generated (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 dividing unit 130 divides the data packet in parallel to generate a plurality of block data (S320). Here, the first block data dividing unit 130 may divide the data packet such that the same number of block data as the multiple of the frame rate of the input packet received from the first data packet generating unit 120 is generated.

The first bit padding unit 140 pads a zero bit to each of the plurality of block data (S330). In other words, the first bit padding unit 140 pads zero bits having a predetermined size so that each of the plurality of block data becomes a size that can be encoded by the encoder 150.

The encoder 150 encodes each of the plurality of block data padded with zero bits to generate a parity bit (S340). Here, it is preferable that the encoder 150 encodes each of the plurality of block data using a Reed Solomon (RS) code method.

The parity combiner 160 generates a plurality of channel coding data by combining each of the plurality of block data obtained from the first block data divider 130 and each of the parity bits generated by the encoder 150 (S350). .

The first serial converter 170 generates an output packet by serially converting the plurality of channel coding data, and transmits the generated output packet to the modulated data generator 180 (S360).

The modulated data generator 180 obtains an output packet from the first serial converter 170, removes a specific bit included in the output packet, and generates a plurality of modulated data (S370).

The OFDM transmitter 190 transmits wideband data including a plurality of subcarriers to the receiver 200 by 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 the present embodiment.

The OFDM receiver 210 receives 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 obtains a plurality of modulation data from the OFDM receiver 210, combines the plurality of modulation data into one received packet, and transmits the plurality of modulation data to the second data packet generator 240 (S420).

The second data packet generator 240 checks the size of the input packet input to the second block data divider 250, and pads a specific bit in the received packet so as to correspond to the size of the input packet. A data packet having a size equal to the size of S 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 dividing unit 250 divides the data packet in parallel to generate a plurality of block data (S440). Here, each of the plurality of block data includes parity bits encoded by the transmitter 100.

The second bit padding unit 260 pads a zero bit on each of the plurality of block data (S450). In other words, the second bit padding unit 260 pads zero bits of a predetermined size such that each of the plurality of block data becomes a size decodable by the decoder 270. Here, the zero bit of the predetermined size is preferably a predetermined size, but is not necessarily limited thereto. The zero bit of the predetermined size may be zero bits of the calculated size after checking the size of the block data.

The decoder 270 removes the parity bit by decoding each of the plurality of block data padded with zero bits (S460). The decoder 270 generates the channel decoding data from which the parity bit is removed. The decoder 270 may decode each of the plurality of block data using a Reed Solomon (RS) code scheme.

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

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

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

FIG. 5A illustrates an operation of channel encoding MAC data having a size of 512b, and FIG. 5B illustrates an operation of channel decoding a received packet having a size of 512b.

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

When it is confirmed that the size of the input packet input to the first block data divider 130 is 696b, the first data packet generator 120 pads a specific bit of 184b into 512b size MAC data and has a size of 696b. Create a data packet. Here, the specific bit of the 184b size means the zero bit of the 184b size.

The first block data dividing unit 130 generates three block data by dividing a data packet having a size of 696b into a size of 232b. Here, when the first block data divider 130 receives the data packet having a size of 696b from the first data packet generator 120 at a three times increased frame rate, The same three block data can be divided.

The first bit padding unit 140 pads zero bits having a size of 7b in each of the three block data.

The encoder 150 encodes each of 239b-sized block data padded with 7b-sized zero bits to generate 16b parity bits. Here, the encoder 150 is preferably an RS (239, 255) encoder.

The parity combiner 160 combines three block data having the size of 232b obtained from the first block data divider 130 and parity bits having the size of 16b generated by the encoder 150 and combines three pieces of 248b. Generate channel coding data having

The first serial converter 170 converts three channel coding data having a size of 248b into a serial to generate an output packet having a size of 744b and transmits the generated 744b sized output packet to the modulation data generator 180. .

The modulated data generator 180 obtains an output packet of size 744b from the first serial converter 170, removes a specific bit of size 184b included in the output packet of size 744b, and then uses a plurality of data using the size of 560b. Generates the modulation data. The modulated data generator 180 transmits a plurality of modulated data to the OFDM transmitter 190 to transmit wideband data to the receiver 200.

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

The OFDM receiver 210 receives wideband data from the transmitter 100 and transmits a plurality of modulated data obtained by modulating the received wideband data to the subcarrier obtainer 230. The subcarrier obtainer 230 obtains a plurality of modulated data from the OFDM receiver 210, combines the plurality of modulated data into one received packet having a size of 560b, and transmits the plurality of modulated data to the second data packet generator 240. .

When the second data packet generator 240 determines that the size of the input packet input to the second block data divider 250 is 744b, the second data packet generator 240 pads a specific bit of 184b into the received packet of size 560b to have a size of 744b. Create a data packet. Here, the specific bit of the 184b size means the zero bit of the 184b size.

The second block data divider 250 divides the data packet of size 744b into the size of 248b to generate three block data. Here, each of the three block data includes a parity bit of size 16b.

The second bit padding unit 260 pads zero bits having a size of 7b in each of the three block data. The second bit padding unit 260 pads zero bits of 7b size to make each block data 255b, which is a size decodable by the decoder 270.

The decoder 270 generates channel decoding data by decoding each of the 255b sized block data padded with the 7b sized zero bits and removing the 16b sized parity bit. Here, the decoder 270 is preferably an RS (239, 255) decoder.

The bit remover 280 generates the 232b-sized channel decoded data by removing the 7b-sized zero bits included in each of the 239b-sized channel decoded data from which the parity bits have been removed.

The second serial converter 290 serially converts three channel decoding data having a size of 232b to generate an output packet having a size of 696b and transmits the generated 696b sized output packet to the data transmitter 292.

The data transmission unit 292 obtains an output packet of 696b size from the second serial converter 290, removes a specific bit of 184b size included in the output packet of 696b size, and then connects the MAC data of 512b size to the terminal or Send to backhaul server.

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

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

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

When the first data packet generator 120 determines that the size of the input packet input to the first block data divider 130 is 1160b, the first data packet generator 120 pads a specific bit of 136b to the MAC data of 1024b size and thus has a size of 1160b. Create a data packet. Here, the specific bit of the 136b size means the zero bit of the 184b size.

The first block data dividing unit 130 generates five block data by dividing the data packet having a size of 1160b into a size of 232b. Here, when the first block data divider 130 receives the data packet having a size of 1160b from the first data packet generator 120 at a frame rate of 5 times increased, the first block data divider 130 receives a multiple of the frame rate increased. The same block data can be divided into five blocks.

The first bit padding unit 140 pads a zero bit having a size of 7b in each of the five block data.

The encoder 150 encodes each of 239b-sized block data padded with 7b-sized zero bits to generate 16b parity bits. Here, the encoder 150 is preferably an RS (239, 255) encoder.

The parity combiner 160 combines each of block data having five 232b sizes obtained from the first block data divider 130 and parity bits having a size of 16b generated by the encoder 150 and combines five 248b sizes. Generate channel coding data having

The first serial converter 170 converts five channel coding data having a size of 248b in series to generate an output packet having a size of 1240b, and transmits the generated output packet having a size of 1240b to the modulation data generator 180. .

The modulated data generator 180 obtains an output packet having a size of 1240b from the first serial converter 170, removes a specific bit having a size of 136b included in the output packet having a size of 1240b, and then uses a plurality of 1104b sized data. Generates the modulation data. The modulated data generator 180 transmits a plurality of modulated data to the OFDM transmitter 190 to transmit wideband data to the receiver 200.

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

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

When it is determined that the size of the input packet input to the second block data divider 250 is 1240b, the second data packet generator 240 pads a specific bit of 136b into a received packet of size 1104b and has a size of 1240b. Create a data packet. Here, the specific bit of the 136b size means the zero bit of the 136b size.

The second block data divider 250 divides the data packet having a size of 1240b into a size of 248b and generates five block data. Here, each of the five block data includes a parity bit of size 16b.

The second bit padding unit 260 pads a zero bit having a size of 7b into each of the five block data. The second bit padding unit 260 pads zero bits of 7b size to make each block data 255b, which is a size decodable by the decoder 270.

The decoder 270 generates channel decoding data by decoding each of the 255b sized block data padded with the 7b sized zero bits and removing the 16b sized parity bit. Here, the decoder 270 is preferably an RS (239, 255) decoder.

The bit remover 280 generates the 232b-sized channel decoded data by removing the 7b-sized zero bits included in each of the 239b-sized channel decoded data from which the parity bits have been removed.

The second serial converter 290 converts five channel decoding data having a size of 232b into serial to generate an output packet having a size of 1160b, and transmits the generated output packet having a size of 1160b to the data transmitter 292.

The data transmission unit 292 obtains an output packet of size 1160b from the second serial converter 290, removes a specific bit of size 136b included in the output packet of size 1160b, and then connects the MAC data of size 1024b or Send to backhaul server.

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

FIG. 7A illustrates an operation of channel encoding MAC data having a size of 1024b, and FIG. 7B illustrates an operation of channel decoding a received packet having a size of 1024b.

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

When it is determined that the size of the input packet input to the first block data divider 130 is 2088b, the first data packet generator 120 pads a specific bit of 40b to 2048b of MAC data having a size of 2088b. Create a data packet. Here, the specific bit of the 40b size refers to the zero bit of the 40b size.

The first block data dividing unit 130 generates nine block data by dividing the data packet having a size of 2088b into a size of 232b. Herein, when the first block data divider 130 receives a 2088b-sized data packet from the first data packet generator 120 at a frame rate of 9 times the frame rate, the first block data divider 130 and The same block data can be divided into nine blocks.

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

The encoder 150 encodes each of 239b-sized block data padded with 7b-sized zero bits to generate 16b parity bits. Here, the encoder 150 is preferably an RS (239, 255) encoder.

The parity combiner 160 combines each of block data having nine 232b sizes obtained from the first block data divider 130 and parity bits having a size of 16b generated by the encoder 150 and combines nine 248b sizes. Generate channel coding data having

The first serial converter 170 converts nine channel coded data having a size of 248b into serial to generate an output packet having a size of 2232b, and transmits the generated 2232b sized output packet to the modulation data generator 180. .

The modulated data generator 180 obtains an output packet having a size of 2232b from the first serial converter 170, removes a specific bit of size 40b included in the output packet having a size of 2232b, and then uses a plurality of data of size 2192b using the 2192b size. Generates the modulation data. The modulated data generator 180 transmits a plurality of modulated data to the OFDM transmitter 190 to transmit wideband data to the receiver 200.

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

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

When the second data packet generator 240 determines that the size of the input packet input to the second block data divider 250 is 2232b, the second data packet generator 240 pads a specific bit of 40b into a 2192b-sized reception packet and has a size of 2232b. Create a data packet. Here, the specific bit of the 40b size refers to the zero bit of the 40b size.

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

The second bit padding unit 260 pads zero bits having a size of 7b in each of the nine block data. The second bit padding unit 260 pads zero bits of 7b size to make each block data 255b, which is a size decodable by the decoder 270.

The decoder 270 generates channel decoding data by decoding each of the 255b sized block data padded with the 7b sized zero bits and removing the 16b sized parity bit. Here, the decoder 270 is preferably an RS (239, 255) decoder.

The bit remover 280 generates the 232b-sized channel decoded data by removing the 7b-sized zero bits included in each of the 239b-sized channel decoded data from which the parity bits have been removed.

The second serial converter 290 converts nine channel decoding data having a size of 232b into serial to generate an output packet having a size of 2088b, and transmits the generated output packet having a size of 2088b to the data transmitter 292.

The data transmission unit 292 obtains an output packet of size 2088b from the second serial converter 290, removes a specific bit of size 40b included in the output packet of size 2088b, and then connects the 2048b size MAC data to the terminal or Send to backhaul server.

The above description is merely illustrative of the technical idea of the present embodiment, and those skilled in the art to which the present embodiment belongs may make various modifications and changes without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical idea of the present embodiment but to describe the present invention, 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 interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present embodiment.

<Description of the code>

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: modulated data generator

190: OFDM transmitter

200: receiver

210: OFDM receiver 220: second control unit

230: subcarrier acquisition unit 240: second data packet generation unit

250: second block data division unit 260: second bit padding unit

270: decoder 280: bit remover

290: second serial converter 292: data transfer unit

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority under No. 119 (a) (35 USC § 119 (a)) of the US Patent Act No. 10-2016-0005062, filed with Korea on January 15, 2016. All content is incorporated by reference in this patent application. In addition, this patent application claims priority to countries other than the United States for the same reasons, all of which are incorporated herein by reference.

Claims (18)

An apparatus for performing channel coding in a transmitter of an orthogonal frequency division multiplexing (OFDM) based wireless communication system, A first data packet generation unit for checking a size of an input packet and generating a data packet having a size of the input packet by padding a specific bit on the input MAC data; A first block data dividing unit dividing the data packets in parallel to generate a plurality of block data; A first bit padding unit configured to pad a zero bit to each of the plurality of block data so that each of the plurality of block data can be encoded; An encoder configured to generate parity bits by encoding each of the block data padded with the zero bits; A parity combiner for generating a plurality of channel coding data by combining the block data and the parity bit; And A first serial converter configured to serially convert the plurality of channel coding data to generate an output packet and to form a plurality of modulated data based on the output packet Channel encoding apparatus comprising a. The method of claim 1, The first data packet generator, And checking the size of the input packet input to the first block data unit, and padding the specific bit in the MAC data so as to correspond to the size of the input packet. The method of claim 1, The specific bit, And a zero bit for converting the size of the MAC data into the same size as that of the input packet. The method of claim 1, The first block data divider, And dividing the data packet so that the number of block data equal to a multiple of the frame rate of the input packet received from the first data packet generator is generated. The method of claim 1, The first bit padding unit, And encoding the zero bits having a predetermined size in each of the plurality of block data. The method of claim 1, The first bit padding unit, And a zero bit having a size calculated based on the size of the block data is padded in the plurality of block data. The method of claim 1, The encoder, And generating the parity bit corresponding to a difference value obtained by subtracting the size of data required for encoding from the size of data required for decoding. The method of claim 7, wherein The encoder, And the parity bit is generated using a code method operating in a block unit. The method of claim 1, And a first controller configured to set a clock rate of the MAC data and the output packet, wherein the first controller is configured to convert the MAC data received from the first data packet generator and the first serial conversion. And a same clock rate is set for the output packet outputted from the receiver. A method of performing channel coding in a transmitter of an OFDM-based wireless communication system, Generating a data packet having a size of the input packet by checking a size of an input packet and padding a specific bit to input MAC data; A first block data dividing step of dividing the data packets in parallel to generate a plurality of block data; A first zero bit padding process of padding zero bits to each of the plurality of block data so that each of the plurality of block data can be encoded; An encoding process of encoding each of the zero-bit padded block data to generate a parity bit; A parity combining process of generating a plurality of channel coding data by combining each of the block data and the parity bit; And A first serial conversion process of generating an output packet by serially converting the plurality of channel coding data and forming a plurality of subcarriers based on the output packet Channel encoding method comprising a. An apparatus for performing channel decoding in a receiver of an OFDM based wireless communication system, A second data packet generator configured to generate a data packet by padding a specific bit into a received packet combining a plurality of modulated data received from a transmitter; A second block data dividing unit dividing the data packets in parallel to generate a plurality of block data; A second bit padding unit configured to pad zero bits to each of the plurality of block data so that each of the plurality of block data can be decodable; A decoder configured to decode each block data padded with the zero bits to remove the parity bits included in the block data to generate decrypted data; A bit remover configured to generate a plurality of MAC data by removing zero bits included in each of the decoded data from which the parity bits are removed; And A second serial converter configured to serially convert the plurality of MAC data to generate an output packet, and output the generated output packet; Channel decoding apparatus comprising a. The method of claim 11, The second data packet generator, And checking the size of an input packet input to the second block data unit, and padding the specific bit in the received packet so as to correspond to the size of the input packet. The method of claim 12, The specific bit, And a zero bit for converting the size of the received packet into the same size as the size of the input packet. The method of claim 11, The second bit padding unit, And decoding the zero bits having a predetermined size into each of the plurality of block data. The method of claim 11, The second bit padding unit, And zeroing the zero bits having a size calculated based on the size of the block data in each of the plurality of block data. The method of claim 11, The decoding unit, And a parity bit generated at the time of encoding is removed. The method of claim 16, The decoding unit, And the parity bit is removed using a code method operating in a block unit. A method for 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 received packet combining a plurality of modulated data received from a transmitter; A second block data dividing step of dividing the data packets in parallel to generate a plurality of block data; A second zero bit padding process of padding zero bits to each of the plurality of block data so that each of the plurality of block data is decodable; A decoding process of decoding each of the zero-bit padded block data to remove parity bits included in the block data to generate decrypted data; A bit removing step of generating a plurality of MAC data by removing zero bits included in each of the decoded data from which the parity bits are removed; And A second serial conversion process of serially converting the plurality of MAC data to generate an output packet, and outputting the generated output packet; Channel decoding method comprising a.

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