KR101514982B1 - Method for transmitting and receiving data in wireless communication and apparatus for the same - Google Patents

Abstract

A method of transmitting data in a wireless communication system is provided. The method comprising: generating a data sequence to be transmitted; Adding at least one additional information sequence to the data sequence to generate at least one additional data sequence; Interleaving the at least one additional data sequence to generate at least one reordered data sequence; Generate at least one binary sequence; Computing each binary sequence and each reordered data sequence to generate at least one candidate sequence; Encoding the at least one candidate sequence to generate at least one encoded candidate sequence; Punctuating the at least one encoded candidate sequence to generate at least one punctured candidate sequence; Modulate the at least one punctured candidate sequence to generate at least one candidate OFDM symbol; Generating at least one candidate OFDM signal by IFFT (Inverse Fast Fourier Transform) the at least one candidate OFDM; Selecting an OFDM signal having the lowest Peak to Average Power Ratio (PAPR) among the at least one candidate OFDM signal; And transmitting the OFDM signal.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for transmitting and receiving data in a wireless communication system, and a device supporting the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless communication, and more particularly, to a method for transmitting and receiving data in a wireless communication system.

OFDM (Orthogonal Frequency Division Multiplexing) modulation schemes have been supported in various wireless communication systems such as mobile wireless communication and wireless local area network (WLAN). A wireless communication system supporting OFDM has a high data rate and is robust against frequency-selective fading. Further, the present invention is characterized in that the frequency utilization efficiency is higher than that of a normal frequency division multiplexing (FDD) system, as a digital modulation system in which data is divided and transmitted to a plurality of subcarriers related to an orthogonal relationship.

However, the PAPR (Peak to Average Power Ratio) of the transmission signal increases as the number of subcarriers of the OFDM system increases. The OFDM signal has a problem in that nonlinear distortion such as in-band distortion and out-of-band radiation occur largely when passing through a high power amplifier (HPA) due to the PAPR characteristic . Therefore, there is a need for a method for minimizing the nonlinear distortion of the HPA generating an OFDM signal having a small PAPR.
A method and apparatus for reducing signal distortion caused by PAPR in such an OFDM system are disclosed in Korean Patent Publication KR10-2004-0074325 (PAPR reduction method in a multi-antenna OFDM communication system and multi-antenna OFDM communication system using the same ).

SUMMARY OF THE INVENTION The present invention provides a method for transmitting and receiving data in a wireless communication system and a device supporting the same.

In an aspect, a method of transmitting data in a wireless communication system is provided. The method comprising: generating a data sequence to be transmitted; Adding at least one additional information sequence to the data sequence to generate at least one additional data sequence; Interleaving the at least one additional data sequence to generate at least one reordered data sequence; Generate at least one binary sequence; Computing each binary sequence and each reordered data sequence to generate at least one candidate sequence; Encoding the at least one candidate sequence to generate at least one encoded candidate sequence; Punctuating the at least one encoded candidate sequence to generate at least one punctured candidate sequence; Modulate the at least one punctured candidate sequence to generate at least one candidate OFDM symbol; Generating at least one candidate OFDM signal by IFFT (Inverse Fast Fourier Transform) the at least one candidate OFDM; Selecting an OFDM signal having the lowest Peak to Average Power Ratio (PAPR) among the at least one candidate OFDM signal; And transmitting the OFDM signal.

Each additional data sequence may include the data sequence and each additional information sequence. Interleaving the at least one additional data may comprise arranging each of the additional information sequences in a position other than the location of an error prone bit in the rearranged data sequence.

The calculating of each of the binary sequences and each of the rearranged data sequences may be performed by modulo-summing the respective binary sequences and the respective rearranged data sequences.

The generation of the encoded candidate sequence may be performed based on an LDPC (Low Density Parity Check) coding scheme.

Each candidate sequence may comprise a rearranged data sequence in which the data sequence is rearranged and a rearrangement additional information sequence in which each additional information sequence is rearranged. The length of the rearranged data sequence may be k bits and the length of the rearranged additional information sequence may be k 'bits. The encoding of each candidate sequence may include adding k 'column components to a first parity check matrix that is a matrix [(n-k), n] to generate a second parity check matrix; And generating each encoded candidate sequence of n + k 'bit length based on the second parity check matrix.

Puncturing each encoded candidate sequence may be puncturing by k 'bits.

The generation of the encoded candidate sequence may be performed based on a turbo coding scheme or an RA coding scheme.

Each candidate sequence may comprise a rearranged data sequence in which the data sequence is rearranged and a rearrangement additional information sequence in which each additional information sequence is rearranged. The length of the rearranged data sequence is k bits and the length of the rearrangement additional information sequence is k 'bits, and the coding rate for encoding may be k / n. The n may be an integer greater than k. The encoding of each candidate sequence may comprise encoding each candidate sequence to produce each encoded candidate sequence having n + nk '/ k bits in length.

Puncturing each encoded candidate sequence may be puncturing by nk '/ k bits.

The encoding of the at least one candidate sequence may be performed based on a non-binary encoding technique.

In another aspect, a wireless device operating in a wireless communication system is provided. The wireless device comprising: a data generator for generating a data sequence to be transmitted; At least one additional information insertion unit for adding at least one additional information sequence to the data sequence to generate at least one additional data sequence; At least one interleaver interleaving the at least one additional data sequence to generate at least one reordered data sequence; At least one information sequence transformer for generating at least one binary sequence and computing at least one candidate sequence by computing each binary sequence and each rearranged data sequence; At least one channel encoder for encoding the at least one candidate sequence to generate at least one encoded candidate sequence; At least one puncturer punctuating the at least one encoded candidate sequence to generate at least one punctured candidate sequence; At least one modulator for modulating the at least one punctured candidate sequence to generate at least one candidate OFDM symbol; At least one IFFT unit for IFFT (Inverse Fast Fourier Transform) the at least one candidate OFDM to generate at least one candidate OFDM signal; A sequence selector for selecting an OFDM signal having a lowest Peak to Average Power Ratio (PAPR) among the at least one candidate OFDM signal; And an RF (Radio Frequency) unit for transmitting the OFDM signal.

Each additional data sequence may include the data sequence and each additional information sequence. The at least one interleaver may be configured to interleave the at least one additional data by arranging each of the additional information sequences at a position other than a position of an error prone bit in the rearranged data sequence.

The at least one information sequence transformer may be configured to perform an operation of modulo-summing the respective binary sequences and the respective rearranged data sequences.

The channel encoder may be configured to generate an encoded candidate sequence based on an LDPC (Low Density Parity Check) coding scheme.

Wherein each candidate sequence comprises a data sequence in which the data sequence is rearranged and a rearrangement additional information sequence in which each additional information sequence is rearranged, the length of the rearranged data sequence being k bits and the rearrangement additional information sequence May be k ' bits. Wherein each of the at least one channel encoders generates a second parity check matrix by adding k 'column components to a first parity check matrix, which is an [(nk), n] matrix, and generates a second parity check matrix based on the second parity check matrix, lt; / RTI > bits of length + k ' bits in length.

Each of the at least one puncturer may be configured to puncture by k 'bits in each encoded candidate sequence.

The channel encoder may be configured to generate the encoded candidate sequence based on a turbo coding scheme or an RA coding scheme.

Wherein each candidate sequence comprises a data sequence in which the data sequence is rearranged and a rearrangement additional information sequence in which each additional information sequence is rearranged, the length of the rearranged data sequence being k bits and the rearrangement additional information sequence May be k ' bits. The code rate for encoding is k / n, where n may be an integer greater than k. The at least one channel encoder may be configured to encode each candidate sequence to generate each encoded candidate sequence having n + nk '/ k bits in length.

Each of the at least one puncturer may be set to puncture by nk '/ k bits in each encoded candidate sequence.

The channel encoder supports a non-binary encoding scheme, and the at least one candidate sequence may be decoded by the non-binary encoding scheme.

According to the data transmission / reception method according to the embodiment of the present invention, a low complexity SLM scheme is provided that can reduce PAPR without further transmitting additional information in an OFDM supporting communication system using channel encoding. The PAPR reduction performance of the proposed method is the same as that of the existing SLM scheme, but the decoding complexity is reduced and the data transmission rate is not reduced by the additional information, so that it can be efficiently applied to the high speed transmission OFDM communication system.

1 is a block diagram illustrating a structure of a transmitter according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a SLM-based data transmission method according to an embodiment of the present invention.
3 is a block diagram illustrating a structure of a receiver according to an embodiment of the present invention.
4 is a diagram showing an example of data transmission according to an embodiment of the present invention.
5 is a diagram showing an example of data reception according to an embodiment of the present invention.
6 is a diagram illustrating a result of an implementation of a data transmission / reception method according to an embodiment of the present invention.

SLM (Selective Mapping) scheme has been proposed to reduce the Peak-to-Average Power Ratio (PAPR) in a wireless communication system supporting Orthogonal Frequency Division Multiplexing (OFDM). The SLM scheme generates one or more candidates of the transmission signal having the same information, and selects a signal having the smallest PAPR among the signals.

One method of generating multiple signals having the same information is to multiply the data bit sequence by Q independent phase sequences and then generate an OFDM signal and select the signal with the smallest PAPR. However, in this method, it is required that additional information indicating which signal is transmitted among the candidates transmittable by the transmitting terminal is additionally transmitted. The transmission of additional information reduces the effective data transmission rate, and if errors occur in the side information, bit error rate (BER) performance deteriorates greatly.

As an example of an SLM scheme that does not use side information in an OFDM system using channel coding, it decodes a signal transmitted from a receiving end for each of Q number of transmittable signals, determines a decoding result with the highest reliability, Can be proposed. In this way, additional transmission of additional information can be excluded, thereby suppressing a reduction in the data transmission rate, but a problem of increasing the decoding complexity at the receiving end can be caused.

In order to solve the above problems, it is necessary to prevent a data transmission rate reduction caused by additional transmission of additional information, to reduce the error rate due to additional information, and to reduce the decoding complexity Based SLM-based transmission / reception method. In the following description, it is assumed that the candidate OFDM signal to be generated for the SLM is Q. [ However, the number of candidate OFDM signals is not limited to this, and may be implemented in a more various number.

Hereinafter, a data transmission / reception method according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a block diagram illustrating a structure of a transmitter according to an embodiment of the present invention. FIG. 1 may be configured to implement a SLM-based data transmission method according to an embodiment of the present invention.

1, a transmitter 100 according to an embodiment of the present invention includes a data generating unit 110, at least one additional information inserting unit 120a to 120q, at least one interleaver 130a to 130q, At least one information sequence converter 140a to 140q, at least one channel encoder 150a to 150q, at least one puncturer 160a to 160q, at least one modulator 170a to 170q, At least one Inverse Fast Fourier Transform (IFFT) unit 180a to 180q, a sequence selector 190 and an RF (Radio Frequency) unit 195. [

The data generation unit 110 generates a data sequence to be transmitted by a wireless device including a transmitter or a user using a wireless device. The generated data sequence is input to each additional information inserting unit.

Each of the at least one additional information inserting unit 120a to 120q generates at least one additional information and adds the generated additional information to each of the data sequences to generate an added data sequence. The added data sequence is input to the interleaver.

Each of the at least one interleaver 130a to 130q rearranges each added data sequence to generate a rearranged data sequence. The rearranged data sequence is input to the information sequence converter.

Each of the at least one information sequence transformer 140a to 140q generates an independent binary sequence and generates a candidate sequence by modulo-2 computing each input rearranged data sequence. The candidate sequence is input to the channel encoder.

Each of the at least one channel encoder 150a through 150q encodes each candidate data sequence.

Each of the at least one puncturer 160a through 160q punctures each encoded candidate sequence.

Each of the at least one modulator 170a to 170q modulates each punctured candidate sequence to generate a candidate OFDM symbol.

Each of at least one IFFT unit 180a to 180q performs IFFT processing on each candidate OFDM symbol to generate a candidate OFDM signal.

The sequence generator 190 selects a specific OFDM signal having the smallest PAPR among a plurality of candidate OFDM signals and transmits the selected OFDM signal to the RF unit 195. The RF unit 195 transmits the transmitted OFDM signal to the receiver through radio resources.

FIG. 2 is a flowchart illustrating a SLM-based data transmission method according to an embodiment of the present invention.

)를 생성한다(S210). 이 때 데이터 시퀀스의 길이는 k비트로 가정한다Referring to FIG. 2, a data sequence relating to data to be transmitted to a receiver

(S210). At this time, the length of the data sequence is assumed to be k bits

)를 데이터 시퀀스(

)에 부가한다(S220). 부가정보는 SLM을 위해 생성할 후보 OFDM 신호의 개수에 따라 가변적으로 생성될 수 있으며, 본 예시에서 후보 OFDM 신호의 개수는 Q개로 가정되므로, 부가정보는

와 같이 표현될 수 있다. Q개의 부가 정보 중 i번째 부가 정보(

)는

와 같이 표현될 수 있다. 각 부가 정보의 길이가 k’비트인 경우

가 만족될 수 있다. 데이터 시퀀스에 i번째 부가 정보가 부가된 부가 데이터 시퀀스는

로 표현될 수 있다.The additional information generated by the additional information insertion unit (

) To a data sequence (

(S220). The additional information may be variably generated according to the number of candidate OFDM signals to be generated for the SLM. In this example, since the number of candidate OFDM signals is assumed to be Q,

Can be expressed as The i th additional information among the Q additional information (

)

Can be expressed as When the length of each additional information is k 'bits

Can be satisfied. The additional data sequence to which the i-th additional information is added to the data sequence is

. ≪ / RTI >

는 인터리버에 의해 재배열되어 재배열된 시퀀스(

)가 생성된다(S230). 부가 데이터 시퀀스가 인터리버에 의하여 재배열됨에 있어서, 채널 오류에 대한 성능을 개선하기 위하여 오류 취약 비트(error prone bit) 위치를 회피하는 방식으로 부가 정보를 구성하는 비트 시퀀스가 배열될 수 있다.Additional data sequence

Are rearranged and rearranged by the interleaver (

Is generated (S230). In order for the additional data sequence to be rearranged by the interleaver, a bit sequence constituting the additional information may be arranged in a manner to avoid error prone bit positions in order to improve performance against channel errors.

The rearranged data sequence is converted into a candidate sequence based on the binary sequence generated by the information sequence converter (S240).

)를 생성한다. 각 이진 시퀀스는 k+k` 길이를 가질 수 있다. 이진 시퀀스에 있어서, 부가 정보의 위치 j에는 임의의 l번째

의 j번째 성분

가 0이 되도록 구현될 수 있다.The information sequence transducer may comprise Q binary sequences (< RTI ID = 0.0 >

). Each binary sequence may have a length k + k '. In the binary sequence, in the position j of the additional information,

The jth component of

May be zero.

및

를 모듈로-2 연산하여 Q개의 후보 시퀀스(

)를 생성한다. i번째 후보 시퀀스

의 길이는 k+k’이다.The binary sequence thus generated

And

By module-2 to obtain Q candidate sequences (

). i th candidate sequence

Is the length of k + k '.

Each of the generated candidate sequences is encoded by a channel encoder (S250). In encoding the candidate sequence, the channel encoder may have a code rate of k / n, the length of each sequence input to the channel encoder is k + k ', and the length of each encoded candidate sequence output is n + to be.

The encoded candidate sequence is punctured through a puncturer (S260). The encoded candidate sequence is punctured by n 'bits to produce a punctured candidate sequence, wherein the punctured candidate sequence has a length of n bits. The bits to be punctured may be selected in the parity portion. However, the determination of the bits to be punctured may vary depending on various implementation methods. The coding schemes that the channel encoder can support include LDPC (Low Density Parity Check) coding, Turbo coding, and RA codes.

패리티 검사 행렬에 k’개의 열을 새롭게 추가하여 새로운 검사 행렬을 구성한다. 이를 기반으로 k+k’비트의 입력 시퀀스에 대해 해당하는 n+k’비트의 인코딩된 후보 시퀀스를 생성한 후, k’비트만큼 천공함으로써 길이가 n비트인 천공된 후보 시퀀스를 생성할 수 있다.When the LDPC coding scheme is used as the channel encoding scheme,

K 'columns are newly added to the parity check matrix to construct a new check matrix. Based on this, a punctured candidate sequence having a length of n bits can be generated by generating an encoded candidate sequence of n + k 'bits corresponding to a k + k' bit input sequence and then puncturing the encoded sequence by k 'bits .

When turbo coding or RA coding is used as the channel encoding scheme, when an encoder has a coding rate of k / n, it is possible to encode an input sequence having a length of k + k ' A candidate sequence may be generated. The punctured candidate sequence of n bits can be generated by puncturing the encoded candidate sequence by nk '/ k bits.

The Q punctured candidate sequences are modulated to generate Q candidate OFDM symbols (S270).

The Q candidate OFDM symbols are IFFT-processed to generate Q candidate OFDM signals (S280).

An OFDM signal having the smallest PAPR among the Q candidate OFDM signals is selected (S290) and transmitted to a receiver through radio resources (S295).

3 is a block diagram illustrating a structure of a receiver according to an embodiment of the present invention. FIG. 3 may be configured to implement an SLM-based data reception method according to an embodiment of the present invention. FIG. 3 may be configured to receive, interpret and acquire data transmitted in accordance with an SLM-based data transmission method according to an embodiment of the present invention.

3, the receiver 300 includes an RF unit 310, an FFT unit 320, a demodulator 330, a channel decoder 340, an information sequence restorer 350, a side information detector 360, An interleaver 370, and an additional information remover 380.

The RF unit 310 receives the OFDM signal transmitted from the transmitter 100.

The FFT unit 320 performs FFT processing on the received OFDM signal.

The demodulator 330 may demodulate the FFT-processed signal to bit-sequence the OFDM symbol.

Decoder 340 decodes the encoded sequence.

라고 하면, 부가정보 검출기(350)는

에서 부가된 정보와 관련된 시퀀스인

를 바로 검출할 수 있다. The decoding sequence output by the decoder is

, The additional information detector 350 detects

The sequence associated with the information added in

Can be detected immediately.

)를 복원한다. 정보 데이터 복원기(360)는 부가 정보 검출기(350)로부터 부가 정보와 관련된 이진 시퀀스를 제공받을 수 있다. 정보 데이터 복원기(360)는 디코딩 시퀀스 및 제공된 이진 시퀀스를 기반으로 재배열된 데이터 시퀀스를 복원할 수 있다.The information data restorer 360 reconstructs the data sequence reordered based on the detected side information

). The information data restorer 360 may be provided with a binary sequence related to the additional information from the additional information detector 350. [ The information data restorer 360 may recover the rearranged data sequence based on the decoding sequence and the provided binary sequence.

The deinterleaver 370 rearranges the sequence of states rearranged by the interleaver.

를 제거한다. The additional information eliminator 380 is a part of the additional information sequence in the sequence rearranged intact by the deinterleaver 370

.

를 획득할 수 있다.Through the above process, the receiver can transmit the data sequence

Can be obtained.

In describing the embodiments of the present invention described above, it is exemplified that a binary channel encoder and a decoder are used. However, the transmission and reception method according to the embodiment of the present invention can also be applied to a case where a non-binary channel encoder and a decoder are used.

Hereinafter, a method of transmitting and receiving data according to an embodiment of the present invention will be described in detail with reference to specific examples. For convenience of description of the present invention, it is assumed that the number Q of candidate OFDM symbols is 4. It is also assumed that each additional information inserting unit generates any additional information. It is assumed that the channel encoder performs turbo encoding. In the case of turbo encoding, since the position of the error prone bit does not appear before the codeword, the additional information is placed at the beginning of the added data sequence. Separate interleaving by the interleaver is omitted.

4 is a diagram showing an example of data transmission according to an embodiment of the present invention.

)를 생성하되, 이는

와 같을 수 있다.4, the data sequence generator 110 generates a data sequence to be transmitted and generates a data sequence having k-bits (

), ≪ / RTI >

≪ / RTI >

에 의하여 2비트로 결정될 수 있다. 이에 따라, 첫 번째 부가 정보

, 두 번째 부가 정보

, 세 번째 부가 정보

, 및 네 번째 부가 정보

가 생성될 수 있다. Each of the additional information insertion units 120a to 120d generates additional information according to Q, which is the number of candidate OFDM signals. The length k 'of additional information

As shown in FIG. Accordingly, the first additional information

, Second additional information

, Third additional information

, And fourth additional information

Can be generated.

,

,

,

)를 데이터 시퀀스(

)에 부가하여, 부가된 데이터 시퀀스

를 생성한다. 본 예시에서 인터리버에 의한 별도의 인터리버는 생략되므로, 부가된 데이터 시퀀스는 도 2에서 전술하였던 시퀀스인

로 볼 수 있다. 이에 따라 첫 번째 부가된 데이터 시퀀스

, 두 번째 부가된 데이터 시퀀스

, 세 번째 부가된 데이터 시퀀스

, 및 네 번째 부가된 데이터 시퀀스

가 생성된다. 각 부가된 데이터 시퀀스는 k+k’비트의 길이를 가질 수 있다.Each of the additional information inserting units 120a to 120d adds each generated additional information (

,

,

,

) To a data sequence (

), The added data sequence

. Since the additional interleaver by the interleaver in this example is omitted, the added data sequence is the sequence

Can be seen as. Thus, the first appended data sequence

, A second appended data sequence

, A third appended data sequence

, And a fourth appended data sequence

Is generated. Each appended data sequence may have a length of k + k 'bits.

,

,

,

)를 생성한다. 단, 본 예시에서 생성되는 이진 시퀀스에 있어서, 부가 정보가 위치할 첫 번째 및 두 번째 비트는 0으로 설정할 수 있다. 본 예시에서, 첫 번째 이진 시퀀스

, 두 번째 이진 시퀀스

, 세 번째 이진 시퀀스

, 네 번째 이진 시퀀스

가 생성되는 것을 예시로 한다.Each of the information sequence converters 140a to 140d generates four binary sequences ("

,

,

,

). However, in the binary sequence generated in this example, the first and second bits at which the additional information is to be located can be set to zero. In this example, the first binary sequence

, The second binary sequence

, The third binary sequence

, The fourth binary sequence

As shown in FIG.

)를 생성한다. 각 정보 시퀀스 변환기는 각각의 부가된 데이터 시퀀스와 해당 이진 시퀀스간 모듈로-2 연산을 함으로써 각각의 후보 시퀀스를 생성할 수 있다. 이에 따라, 첫 번째 후보 시퀀스

, 두 번째 후보 시퀀스

, 세 번째 후보 시퀀스

, 및 네 번째 후보 시퀀스

가 생성될 수 있다.Each of the information sequence converters 140a to 140d applies a binary sequence corresponding to each added data sequence to generate a candidate sequence (

). Each information sequence converter may generate a respective candidate sequence by performing a modulo-2 operation between each additional data sequence and the corresponding binary sequence. Accordingly, the first candidate sequence

, The second candidate sequence

, The third candidate sequence

, And the fourth candidate sequence

Can be generated.

The candidate sequences thus generated are encoded by the respective channel encoders 150a to 150d. In this example, the coding rate is 1/2, and the length of the candidate sequence encoded by each encoder is 2k + 2k 'bits.

The encoded candidate sequences are punctured by respective puncturers 160a through 160d. The encoded candidate sequences are punctured by 2k ' bits to become a punctured candidate sequence. Through such puncturing, the entire system generates a punctured candidate sequence of 2k bits in length according to a k-bit length data sequence. The length of the output sequence of the encoder, such as a punctured candidate sequence in contrast to the data sequence, is doubled, so that the coding rate is substantially the same as that of a system not using the SLM technique.

Each modulator 170a through 170d performs modulation on each of the four punctured candidate sequences to produce four candidate OFDM symbols.

Each of the IFFT units 180a to 180d IFFT-processes each of the four generated candidate OFDM symbols to generate four candidate OFDM signals.

가 처리되어 생성된 OFDM 신호의 PAPR이 가장 작은 것을 예시로 한다.The sequence selector 190 selects an OFDM signal having the smallest PAPR from the four candidate OFDM signals, and the RF unit 195 transmits the OFDM signal to the receiver through the radio resource. In this example,

And the PAPR of the generated OFDM signal is the smallest.

5 is a diagram showing an example of data reception according to an embodiment of the present invention. An example of the reception shown in Fig. 5 assumes to receive the data transmitted by Fig.

The RF unit 310 receives the transmitted OFDM signal.

The FFT unit 320 performs FFT processing on the received OFDM signal.

The demodulator 330 can demodulate the FFT-processed signal and bit-sequence the OFDM symbol.

는 후보 시퀀스

이 된다. 디코딩 시퀀스는 부가 정보 검출기(350) 및 정보 데이터 복원기(360)에 입력될 수 있다.Decoder 340 decodes the encoded sequence. If no error has occurred at the output of the decoder, the decoding sequence, which is the output sequence of the decoder

Is a candidate sequence

. The decoding sequence may be input to the side information detector 350 and the information data restorer 360.

에 적용되어 있는 부가 정보

를 검출할 수 있다.

는

이므로, 부가 정보 검출기는 부가 정보

로서

을 검출할 수 있다. 부가 정보 검출기는 검출된 부가 정보

(

)에 대응되는 이진 시퀀스 인

를 정보 데이터 복원기로 전달한다.The additional information detector 350 generates a decoding sequence

Additional information applied to

Can be detected.

The

The additional information detector can detect the additional information

as

Can be detected. The additional information detector detects the additional information

(

) ≪ / RTI >

To the information data restorer.

) 및 전달받은 이진 시퀀스(

)를 기반으로 부가된 데이터 시퀀스

를 복원할 수 있다. 정보 데이터 복원기(360)는 디코딩 시퀀스 및 디진 시퀀스를 모듈로-2 연산하여 부가된 데이터 시퀀스를 복원할 수 있다. 이 때 부가된 데이터 시퀀스는

일 수 있다. 정보 데이터 복원기(360)는 복원을 통해 생성된 부가된 데이터 시퀀스

(

)를 부가 정보 제거기(380)로 전달한다.The information data appending unit 360 receives the decoding sequence (

) And the received binary sequence (

) ≪ / RTI >

Can be restored. The information data restorer 360 may perform a modulo-2 operation on the decoding sequence and the digested sequence to recover the added data sequence. The data sequence added at this time is

Lt; / RTI > The information data restorer 360 restores the added data sequence

(

To the additional information remover 380.

(

)에서 부가 정보

(

)를 제거하여 송신기가 전송하고자 했던 데이터 시퀀스

를 획득할 수 있다.The additional information eliminator 360 generates an additional data sequence

(

) Additional information

(

) To remove the data sequence that the transmitter wanted to transmit

Can be obtained.

6 is a diagram illustrating a result of an implementation of a data transmission / reception method according to an embodiment of the present invention. The result of FIG. 4 corresponds to an example of the case where the number N of subcarriers is 1024, the number of candidate OFDM symbols is Q = 16, and QPSK is used as a modulation scheme.

Referring to FIG. 6, when a theoretical PAPR CCDF (Complementary Cumulative Distribution Function) result is used without using an SLM and a theoretical PAPR CCDF is used when an existing SLM is used, PAPR is lowered . In addition, the results of PAPR CCDF according to the proposed SLM-based transmission / reception method are very similar to the theoretical results of conventional SLM-based transmission / reception method, and PAPR is lower than that of SLM-based transmission / reception method. As a result, it can be seen that the data transmission / reception method according to the embodiment of the present invention can obtain a better PAPR effect than the conventional method.

The data transmission / reception method and the transceiver supporting the data transmission / reception method according to the embodiment of the present invention can be implemented by a wireless device implemented as a processor, a memory, and an RF unit. The processor may be configured to implement the transmission / reception method according to the embodiment of the present invention described above. The processor may comprise an application-specific integrated circuit (ASIC), other chipset, logic circuitry and / or a data processing device. The memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices. The RF unit may include a baseband circuit for processing the radio signal. When the embodiment is implemented in software, the above-described techniques may be implemented with modules (processes, functions, and so on) that perform the functions described above. The module is stored in memory and can be executed by the processor. The memory may be internal or external to the processor and may be coupled to the processor by any of a variety of well known means.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders or simultaneously . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

Claims (20)

A method for transmitting data in a wireless communication system,
Generating a data sequence to be transmitted;
Adding at least one additional information sequence to the data sequence to generate at least one additional data sequence;
Interleaving the at least one additional data sequence to generate at least one reordered data sequence;
Generate at least one binary sequence;
Computing each binary sequence and each reordered data sequence to generate at least one candidate sequence;
Encoding the at least one candidate sequence to generate at least one encoded candidate sequence;
Punctuating the at least one encoded candidate sequence to generate at least one punctured candidate sequence;
Modulate the at least one punctured candidate sequence to generate at least one candidate OFDM symbol;
Generating at least one candidate OFDM signal by IFFT (Inverse Fast Fourier Transform) the at least one candidate OFDM;
Selecting an OFDM signal having the lowest Peak to Average Power Ratio (PAPR) among the at least one candidate OFDM signal; And
And transmitting the OFDM signal. The method according to claim 1,
Each additional data sequence including the data sequence and each additional information sequence,
Interleaving the at least one additional data comprises:
And arranging each additional information sequence in the rearranged data sequence at a position other than a position of an error prone bit. 3. The method of claim 2,
Wherein each of the binary sequences and each of the rearranged data sequences is calculated,
And summing the respective binary sequences and the respective rearranged data sequences modulo-2. The method according to claim 1,
Wherein generating the encoded candidate sequence is performed based on an LDPC (Low Density Parity Check) coding scheme. 5. The method of claim 4,
Wherein each candidate sequence comprises a data sequence in which the data sequence is rearranged and a rearrangement additional information sequence in which each additional information sequence is rearranged, the length of the rearranged data sequence being k bits and the rearrangement additional information sequence Lt; RTI ID = 0.0 > k '
Encoding each of the candidate sequences
generating a second parity check matrix by adding k 'column components to a first parity check matrix, which is a [(nk), n] matrix; And
And generating each encoded candidate sequence of n + k 'bit length based on the second parity check matrix. 6. The method of claim 5, wherein puncturing each encoded candidate sequence comprises:
k " bits. < / RTI > The method according to claim 1,
Wherein the generating of the encoded candidate sequence is performed based on a turbo coding scheme or an RA coding scheme. 8. The method of claim 7,
Wherein each candidate sequence comprises a data sequence in which the data sequence is rearranged and a rearrangement additional information sequence in which each additional information sequence is rearranged, the length of the rearranged data sequence being k bits and the rearrangement additional information sequence Lt; RTI ID = 0.0 > k '
Wherein the code rate for encoding is k / n, where n is an integer greater than k,
Wherein encoding each candidate sequence comprises encoding each candidate sequence to produce each encoded candidate sequence having n + nk '/ k bits in length. 9. The method of claim 8,
Puncturing each encoded candidate sequence comprises:
nk '/ k bits. 2. The method of claim 1, wherein encoding the at least one candidate sequence comprises:
Wherein the decoding is performed based on a non-binary encoding scheme. A wireless device operating in a wireless communication system, the wireless device comprising:
A data generation unit for generating a data sequence to be transmitted;
At least one additional information insertion unit for adding at least one additional information sequence to the data sequence to generate at least one additional data sequence;
At least one interleaver interleaving the at least one additional data sequence to generate at least one reordered data sequence;
At least one information sequence transformer for generating at least one binary sequence and computing at least one candidate sequence by computing each binary sequence and each rearranged data sequence;
At least one channel encoder for encoding the at least one candidate sequence to generate at least one encoded candidate sequence;
At least one puncturer punctuating the at least one encoded candidate sequence to generate at least one punctured candidate sequence;
At least one modulator for modulating the at least one punctured candidate sequence to generate at least one candidate OFDM symbol;
At least one IFFT unit for IFFT (Inverse Fast Fourier Transform) the at least one candidate OFDM to generate at least one candidate OFDM signal;
A sequence selector for selecting an OFDM signal having a lowest Peak to Average Power Ratio (PAPR) among the at least one candidate OFDM signal; And
And an RF (Radio Frequency) unit for transmitting the OFDM signal. 12. The method of claim 11,
Each additional data sequence including the data sequence and each additional information sequence,
Wherein the at least one interleaver is arranged to interleave the at least one additional data by arranging each of the additional information sequences at a position other than a position of an error prone bit in the rearranged data sequence. Device. 13. The method of claim 12,
Wherein the at least one information sequence transformer
And to perform an operation of modulo-summing the respective binary sequences and the respective rearranged data sequences. 12. The method of claim 11,
Wherein the channel encoder is configured to generate an encoded candidate sequence based on an LDPC (Low Density Parity Check) coding scheme. 15. The method of claim 14,
Wherein each candidate sequence comprises a data sequence in which the data sequence is rearranged and a rearrangement additional information sequence in which each additional information sequence is rearranged, the length of the rearranged data sequence being k bits and the rearranging additional information sequence Lt; RTI ID = 0.0 > k '
Each of the at least one channel encoder
generating a second parity check matrix by adding k 'column components to a first parity check matrix, which is a [(nk), n] matrix, and
And generates each encoded candidate sequence of n + k 'bit length based on the second parity check matrix. 16. The method of claim 15,
Wherein each of the at least one puncturer is configured to puncture by k 'bits in each encoded candidate sequence. 12. The method of claim 11,
Wherein the channel encoder is configured to generate the encoded candidate sequence based on a turbo coding scheme or an RA coding scheme. 18. The method of claim 17,
Wherein each candidate sequence comprises a data sequence in which the data sequence is rearranged and a rearrangement additional information sequence in which each additional information sequence is rearranged, the length of the rearranged data sequence being k bits and the rearrangement additional information sequence Lt; RTI ID = 0.0 > k '
Wherein the code rate for encoding is k / n, where n is an integer greater than k,
Wherein the at least one channel encoder is configured to encode each candidate sequence to generate each encoded candidate sequence having n + nk '/ k bits in length. 19. The method of claim 18,
Wherein each of the at least one puncturer is set to puncture by nk '/ k bits in each encoded candidate sequence. 12. The method of claim 11,
The channel encoder supports a non-binary encoding scheme,
Wherein the at least one candidate sequence is decoded by the non-binary encoding technique.

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