KR20180138078A - Apparatus for Signal Transmitting and Receiving using FBMC applied to MIMO Antenna, and Method Thereof - Google Patents

Abstract

Disclosed are a device for transmitting and receiving signals by using an FBMC applied to a MIMO antenna, and a method thereof. The disclosed transmitting device comprises: a preprocessing unit for performing preprocessing on an input signal; and an FBMC transmitting unit for transmitting the preprocessed signal by using a QAM-based FBMC transmission matrix. The preprocessing unit performs preprocessing by using a right specific vector matrix V generated by performing SVD on the FBMC transmission matrix. According to the disclosed device, the QAM-based FMBC can be applied to a MIMO antenna without changing the shape of the filter and without a protective section. In addition, provided is an advantage that FMBC transmission is capable of eliminating all inter-carrier interference and inter-symbol interference in the MIMO antenna.

Description

[0001] The present invention relates to an apparatus and method for transmitting and receiving signals using an FBMC applied to a MIMO antenna,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmitting and receiving apparatus and method thereof, and more particularly, to a signal transmitting and receiving apparatus and method using an FBMC applied to a MIMO antenna.

The FBMC (Filter-Bank Multicarrier) system is low in out-of-band radiation power and robust against multipath fading without guard interval, and is being studied as a system to replace OFDM (Orthogonal Frequency Division Multiplexing) system in future mobile communication system.

Of the various FBMC systems, the most studied systems are OQAM (Offset Quadrature Amplitude Modulation) based FBMC systems. An OQAM-based FBMC system is a system that alternately transmits real and imaginary parts to avoid intrinsic interference caused by overlapping of filtered signals. However, since this system satisfies the orthogonal condition only in the real number domain, performance deterioration occurs due to intrinsic interference with an imaginary value when applied to a multiple input multiple output (MIMO) antenna.

In the case of a QAM (Quadrature Amplitude Modulation) -based FBMC system, two filters are used. One high-performance filter and a filter orthogonal to the filter are used to avoid interference. However, when the QAM is applied to a MIMO antenna, the out-of-band radiation performance, which is a fundamental advantage of the FBMC, is very poor because it hurts the shape of the filter.

In order to solve the problems of the prior art as described above, the present invention provides a QAM-based FBMC-based signal transmitting and receiving apparatus and method applicable to a MIMO antenna.

According to a first aspect of the present invention, there is provided a signal processing apparatus comprising: a preprocessing unit for performing preprocessing on an input signal; And an FBMC transmitter for transmitting the pre-processed signal using a QAM-based FBMC transmission matrix, wherein the preprocessor performs a preprocessing using the right singular vector matrix V generated by performing SVD on the FBMC transmission matrix A signal transmitting apparatus using the FBMC is provided.

And the input signal uses only one of odd numbered subcarriers and even numbered subcarriers.

Wherein the power allocator allocates power using a component of the diagonal matrix generated by performing SVD on the FBMC transmission matrix, and the preprocessor allocates power to the FBMC transmission matrix, And the signal is pre-processed.

And a serial converter for converting the pre-processed signal into a serial signal, wherein the FBMC transmitter transmits the serial-converted signal.

The pre-processing unit performs pre-processing according to the following equation.

은 전처리된 신호이며,

는 FBMC 송신 행렬의 오른쪽 특이 벡터 행렬이고,

은 입력 신호이다.In the above equation,

Is a preprocessed signal,

Is the right singular vector matrix of the FBMC transmit matrix,

Is an input signal.

And the power allocator allocates power according to the following equation.

은 전력이 할당된 신호이며,

은 입력 신호이고,

은 FBMC 송신 행렬에 SVD를 수행하여 생성된 대각행렬의 구성 성분이다.In the above equation,

Is a signal to which power is allocated,

Is an input signal,

Is a component of the diagonal matrix generated by performing the SVD on the FBMC transmission matrix.

According to a second embodiment of the present invention, there is also provided an FBMC receiver for receiving a transmitted signal using a QAM-based FBMC transmission matrix; And a post-processing unit for performing post-processing on the received signal, wherein the post-processing unit performs post-processing using the left singular vector matrix U generated by performing SVD on the FBMC transmission matrix, Is received after pre-processing is performed using the right singular vector matrix V generated by performing SVD on the FBMC transmission matrix.

And the transmitted signal uses only one of an odd numbered subcarrier and an even numbered subcarrier.

And a post-processing unit for performing post-processing on the parallel-converted signal, wherein the received signal is converted into a serial signal and then received.

And the post-processing unit performs post-processing according to the following equation.

은 후처리된 신호이며,

는 FBMC 송신 행렬의 왼쪽 특이 벡터 행렬이고,

은 수신된 신호이다.In the above equation,

Is a post-processed signal,

Is the left singular vector matrix of the FBMC transmission matrix,

Is a received signal.

According to a third aspect of the present invention, there is also provided a method of generating a signal, comprising the steps of: (a) performing a preprocessing on an input signal; And (b) transmitting the preprocessed signal using a QAM-based FBMC transmission matrix, wherein the step (b) includes the steps of: using the right singular vector matrix V generated by performing SVD on the FBMC transmission matrix And performing pre-processing on the received signal.

And the input signal uses only one of odd numbered subcarriers and even numbered subcarriers.

Further comprising the step of: (c) allocating power to the input signal before step (a), wherein the step (c) further comprises the step of: using power of the diagonal matrix generated by performing the SVD on the FBMC transmission matrix, And in the step (a), pre-processing is performed on the signal to which the power is allocated.

The method may further include: (d) before the step (b), converting the preprocessed signal to serial, wherein the step (b) transmits the serial-converted signal.

In the step (a), pre-processing is performed by the following equation.

은 전처리된 신호이며,

는 FBMC 송신 행렬의 오른쪽 특이 벡터 행렬이고,

은 입력 신호이다.In the above equation,

Is a preprocessed signal,

Is the right singular vector matrix of the FBMC transmit matrix,

Is an input signal.

In the step (c), power is allocated according to the following equation.

은 전력이 할당된 신호이며,

은 입력 신호이고,

은 FBMC 송신 행렬에 SVD를 수행하여 생성된 대각행렬의 구성 성분이다.In the above equation,

Is a signal to which power is allocated,

Is an input signal,

Is a component of the diagonal matrix generated by performing the SVD on the FBMC transmission matrix.

According to a fourth embodiment of the present invention, there is also provided a method of transmitting a signal, comprising: (a) receiving a transmitted signal using a QAM-based FBMC transmission matrix; And performing post-processing on the received signal, wherein (b) performs post-processing using a left singular vector matrix U generated by performing SVD on the FBMC transmission matrix, And the received signal is received after pre-processing is performed using the right singular vector matrix V generated by performing SVD on the FBMC transmission matrix.

And the transmitted signal uses only one of an odd numbered subcarrier and an even numbered subcarrier.

The method of claim 1, further comprising the step of: (c) before the step (b), converting the received signal to parallel, wherein the step (b) And converted into serial data and then received.

The step (b) is characterized in that post-processing is performed by the following equation.

은 후처리된 신호이며,

는 FBMC 송신 행렬의 왼쪽 특이 벡터 행렬이고,

은 수신된 신호이다.In the above equation,

Is a post-processed signal,

Is the left singular vector matrix of the FBMC transmission matrix,

Is a received signal.

According to a fifth aspect of the present invention, there is provided a computer-readable recording medium on which a program for performing a signal transmission method or a receiving method using the FBMC is recorded.

The present invention is advantageous in that QAM-based FMBC can be applied to a MIMO antenna without changing the shape of a filter and without a guard interval.

Also, there is an advantage that FMBC transmission capable of eliminating both inter-subcarrier interference and inter-symbol interference in the MIMO antenna is advantageous.

1 is a diagram for explaining a method of transmitting and receiving signals using a QAM-based FBMC according to the present invention.
2 is a structural diagram of a signal transmitting apparatus using an FBMC applied to a MIMO antenna according to an embodiment of the present invention.
3 is a structural diagram of a signal receiving apparatus using an FBMC applied to a MIMO antenna according to an embodiment of the present invention.
4 is a diagram for explaining a signal transmitting apparatus and a receiving apparatus using an FBMC applied to a MIMO antenna according to a preferred embodiment of the present invention.
FIG. 5 is a flowchart illustrating a signal transmission method using an FBMC applied to a MIMO antenna according to a preferred embodiment of the present invention, according to time.
FIG. 6 is a flowchart illustrating a signal reception method using an FBMC applied to a MIMO antenna according to a preferred embodiment of the present invention, according to time.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention transmits and receives signals using a QAM transmission-based FBMC.

1 is a diagram for explaining a method of transmitting and receiving signals using a QAM-based FBMC according to the present invention.

Referring to FIG. 1, in a signal transmission / reception method using a QAM-based FBMC, data is not carried on an odd numbered subcarrier but QAM data is transmitted on an even numbered subcarrier. In addition, as in the case of the FBMC based on the OQAM transmission, each transmission symbol is superimposed with a difference of half of the total subcarrier length. In this case, there is no inter-carrier interference (ICI) on the receiving side, and only inter-symbol interference (ISI) due to symbol overlap exists.

2 is a structural diagram of a signal transmitting apparatus using an FBMC applied to a MIMO antenna according to an embodiment of the present invention.

Referring to FIG. 2, a signal transmitting apparatus using an FBMC applied to a MIMO antenna according to an exemplary embodiment of the present invention includes a power allocating unit 110, a preprocessing unit 120, a serial converting unit 130, and an FBMC transmitting unit 140).

The power allocation unit 110 converts the input signal so as to prevent the noise amplification phenomenon. The signal converted by the power allocation unit 110 is expressed by the following equation.

은 전력 할당부(110)에서 변환된 신호이며,

는 전력 할당 행렬이고,

은 입력된 신호이며, 부반송파

이다.In Equation (1)

Is a signal converted by the power allocation unit 110,

Is a power allocation matrix,

Is an input signal, and a subcarrier

to be.

은 짝수 번호만 고려할 수 있다.In order to avoid interference between subcarriers, transmission and reception of signals using QAM-based FBMCs according to the present invention transmit QAM data only on even-numbered subcarriers without transmitting data on odd-numbered subcarriers,

Only an even number may be considered.

Meanwhile, when performing an SVD (Singular Value Decomposition) on the FBMC transmission matrix used in the QAM-based FBMC transmission according to the present invention, the following equation is obtained.

는 FBMC 송신 행렬이며,

는

의 왼쪽 특이 벡터 행렬이고,

는

의 오른쪽 특이 벡터 행렬이며,

는

대각 행렬이고,

및

는

유니터리 행렬이다. FBMC 송신 행렬의 특징에 의해

와

는 동일하고,

의 모든 구성 성분은 양의 실수이다.In Equation (2)

Is an FBMC transmission matrix,

The

Lt; / RTI > is the left singular vector matrix of &

The

Lt; / RTI > is the right singular vector matrix of &

The

Diagonal matrix,

And

The

It is a unitary matrix. By the characteristics of the FBMC transmission matrix

Wow

Lt; / RTI >

All of the components are positive real numbers.

On the other hand, the signal-to-noise ratio (SNR) is expressed by the following equation.

은 신호대잡음비이며,

은 FBMC 채널 계수이고,

은 대각 행렬

의 구성 성분이며,

은 대각 행렬인 전력 할당 행렬

의 구성 성분이다.In Equation (3)

Is the signal-to-noise ratio,

Is the FBMC channel coefficient,

Diagonal matrix

≪ / RTI >

A power allocation matrix < RTI ID = 0.0 >

≪ / RTI >

을 구할 수 있다.Therefore, in order to minimize the noise amplification,

Can be obtained.

으로 구할 수 있으며, 전력 할당 행렬

는

로 구성된 대각 행렬이다.Therefore, by the formula (4)

, And the power allocation matrix

The

≪ / RTI >

를 이용하여 신호에 전력 할당을 함으로 FBMC를 이용한 신호 송신 및 수신 과정에서 잡음 증폭 현상을 방지할 수 있게 된다.The power allocation unit 110 allocates the power allocation matrix

It is possible to prevent the noise amplification phenomenon in the signal transmission and reception process using the FBMC.

The preprocessor 120 preprocesses the signal converted by the power allocation unit 110 to remove inter-symbol interference (ISI). The signal converted by the preprocessing unit 120 is expressed by the following equation.

은 전처리부(120)에서 변환된 신호이며,

는

의 오른쪽 특이 벡터 행렬이다.In Equation (2)

Is a signal converted by the preprocessing unit 120,

The

Is the right singular vector matrix.

의 오른쪽 특이 벡터 행렬

를 이용하여 전처리를 함으로, 심볼간 간섭(ISI)을 제거할 수 있게 된다.The preprocessing unit 120

Right singular vector matrix of

It is possible to eliminate inter-symbol interference (ISI).

The serializer 130 converts the signals converted by the preprocessor 120 into parallel signals for transmission through the FBMC transmitter 140.

The signal converted by the preprocessing unit 120 is expressed by the following equation.

Meanwhile, the serial-converted signal in the serializer 130 is expressed by the following equation.

은 직렬로 변환된 신호이며,

은 심볼의 개수이다.In Equation (7)

Is a serial-converted signal,

Is the number of symbols.

The FBMC transmission unit 140 transmits the serial-converted signals in the serial conversion unit 130 using the QAM-based FBMC.

3 is a structural diagram of a signal receiving apparatus using an FBMC applied to a MIMO antenna according to an embodiment of the present invention.

3, a signal receiving apparatus using an FBMC applied to a MIMO antenna according to an exemplary embodiment of the present invention may include an FBMC receiving unit 210, a parallel converting unit 220, and a post-processing unit 230 .

The FBMC receiving unit 210 receives a signal transmitted by the FBMC transmitting unit 140. [ The signal received by the FBMC receiver 210 is expressed by the following equation.

는 QAM 기반의 FBMC 송신 행렬이며,

은 수신된 신호이다.In Equation (2)

Is a QAM-based FBMC transmission matrix,

Is a received signal.

The parallel conversion unit 220 converts the serial signals received from the FBMC receiving unit 210 into parallel signals.

The serial signal received by the FBMC receiver 210 is expressed by the following equation.

Meanwhile, the signal converted in parallel by the parallel conversion unit 220 is expressed by the following equation.

은 병렬변환부(220)에서 병렬로 변환된 신호이다.In Equation (10)

Are parallel-converted signals in the parallel conversion unit 220. [

In the post-processing unit 230, the parallel conversion unit 220 performs post-processing on the signals converted in parallel. The signal converted by the post-processing unit 230 is expressed by the following equation.

은 후처리부(230)에서 변환된 신호이며,

는

의 왼쪽 특이 벡터 행렬이다.In Equation (11)

Is a signal converted by the post-processing unit 230,

The

Lt; / RTI >

4 is a diagram for explaining a signal transmitting apparatus and a receiving apparatus using an FBMC applied to a MIMO antenna according to a preferred embodiment of the present invention.

은 전력 할당부(110)를 거쳐 잡음 증폭이 방지되며, 전처리부(120)를 거쳐 심볼간 간섭이 제거된다. 그리고, 직렬변환부(130)를 통해 직렬로 변환되어 FBMC송신부(140)에 의해 송신된다. 송신된 신호는 FBMC수신부(210)에서 수신되어 병렬변환부(220)에서 다시 병렬로 변환된다. 그 후 후처리부(230)에서의 변환을 통해 원하는 신호

를 얻을 수 있게 된다.Referring to FIG. 4,

Noise amplification is prevented through the power allocation unit 110 and inter-symbol interference is eliminated through the pre-processing unit 120. [ Then, it is converted into a serial through the serial conversion unit 130 and transmitted by the FBMC transmission unit 140. The transmitted signal is received by the FBMC receiving unit 210 and is then converted into parallel in the parallel conversion unit 220. Thereafter, through the conversion in the post-processing unit 230,

.

The process of the signal transmitting apparatus and the receiving apparatus using the FBMC applied to the MIMO antenna according to the preferred embodiment of the present invention is as follows.

은 FBMC송신부(140)와 FBMC수신부(210)의 송수신 과정에서 발생하는 잡음이다. 잡음

은 전력 할당 행렬

에 의해 최소화될 수 있다.In Equation (12)

Is a noise generated in the transmitting and receiving processes of the FBMC transmitting unit 140 and the FBMC receiving unit 210. Noise

Is a power allocation matrix

. ≪ / RTI >

FIG. 5 is a flowchart illustrating a signal transmission method using an FBMC applied to a MIMO antenna according to a preferred embodiment of the present invention, according to time.

5, a signal transmission method using an FBMC applied to a MIMO antenna according to a preferred embodiment of the present invention includes a power allocating step S510, a preprocessing step S520, a serial converting step S530, (S540).

The power allocating step S510 is a step of allocating power to the signal input from the power allocating unit 110. [ The power allocation unit 110 converts the signal input by Equation (1), and prevents amplification of noise.

The preprocessing step S520 is a step of performing a preprocessing conversion to remove inter-symbol interference (ISI) of the signal converted by the power allocating unit 110. [ The signal is converted by the equation (5).

The serial conversion step S530 is a step of converting the parallel signal of Equation (6) into the serial signal of Equation (7) in the serialization unit (130).

The FBMC transmitting step (S540) is a step of transmitting a signal by the FBMC transmitting unit. The signal is transmitted in the QAM method.

FIG. 6 is a flowchart illustrating a signal reception method using an FBMC applied to a MIMO antenna according to a preferred embodiment of the present invention, according to time.

Referring to FIG. 6, a method of receiving a signal using an FBMC applied to a MIMO antenna according to an exemplary embodiment of the present invention includes an FBMC reception step S610, a parallel conversion step S620, and a post-processing step S630 .

The FBMC receiving step (S610) is a step of receiving a signal from the FBMC receiving unit (210). The received signal is shown in Equation (8).

The parallel conversion step S620 is a step of converting the serial signal of Equation (9) into the parallel signal of Equation (10) in the parallel conversion unit (220).

In the post-processing step S630, the post-processing unit 230 converts the signal using Equation (11).

As described above, the present invention performs power allocation and post-processing using a matrix obtained after performing SVD on a matrix used for FBMC transmission, thereby preventing intersymbol interference and noise amplification. In addition, since data is transmitted only to either the even-numbered or odd-numbered subcarriers, interference between the subcarriers can also be avoided. In particular, by using the present invention, QAM-based FMBC can be applied to a MIMO antenna without changing the shape of a filter and without a guard interval.

The above-described technical features may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- Those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the scope of the present invention. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

110: Power allocation unit
120:
130: serial conversion unit
140: FBMC transmitter
210: FBMC receiver
220: parallel conversion unit
230: Post-

Claims (21)

A preprocessor for performing preprocessing on an input signal; And
And an FBMC transmitter for transmitting the pre-processed signal using a QAM-based FBMC transmission matrix,
Wherein the pre-processing unit performs pre-processing using the right singular vector matrix V generated by performing SVD on the FBMC transmission matrix. The method according to claim 1,
Wherein the input signal uses only one of an odd numbered subcarrier and an even numbered subcarrier. The method according to claim 1,
Further comprising a power allocator for allocating power to the input signal,
The power allocator allocates power using a diagonal matrix component generated by performing SVD on the FBMC transmission matrix,
Wherein the pre-processor performs pre-processing on the signal to which the power is allocated. The method according to claim 1,
And a serial converter for converting the preprocessed signal into a serial signal,
And the FBMC transmitter transmits the serial-converted signal. The method according to claim 1,
Wherein the pre-processing unit performs pre-processing according to the following equation.

In the above equation,

Is a preprocessed signal,

Is the right singular vector matrix of the FBMC transmit matrix,

Is an input signal. The method of claim 3,
Wherein the power allocation unit allocates power according to the following equation.

In the above equation,

Is a signal to which power is allocated,

Is an input signal,

Is a component of the diagonal matrix generated by performing the SVD on the FBMC transmission matrix. An FBMC receiver for receiving a transmitted signal using a QAM-based FBMC transmission matrix; And
And a post-processing unit for post-processing the received signal,
The post-processing unit performs post-processing using the left singular vector matrix U generated by performing SVD on the FBMC transmission matrix,
Wherein the received signal is received after pre-processing is performed using the right singular vector matrix V generated by performing SVD on the FBMC transmission matrix. 8. The method of claim 7,
Wherein the transmitted signal uses only one of an odd numbered subcarrier and an even numbered subcarrier. 8. The method of claim 7,
And a parallel conversion unit for converting the received signals into parallel signals,
Wherein the post-processing unit performs post-processing on the parallel-converted signal, and the received signal is converted into a serial signal and then received. 8. The method of claim 7,
Wherein the post-processing unit performs post-processing according to the following equation.

In the above equation,

Is a post-processed signal,

Is the left singular vector matrix of the FBMC transmission matrix,

Is the received signal. (a) performing a preprocessing on an input signal; And
(b) transmitting the preprocessed signal using a QAM-based FBMC transmission matrix,
Wherein the pre-processing is performed using the right singular vector matrix V generated by performing SVD on the FBMC transmission matrix. 12. The method of claim 11,
Wherein the input signal uses only one of an odd numbered subcarrier and an even numbered subcarrier. 12. The method of claim 11,
Before the step (a)
(c) allocating power to the input signal,
In the step (c), power is allocated using a component of a diagonal matrix generated by performing SVD on the FBMC transmission matrix,
Wherein the step (a) performs pre-processing on the signal to which the power is allocated. 12. The method of claim 11,
Before the step (b)
(d) converting the pre-processed signal to serial,
And the step (b) comprises transmitting the serial-converted signal. 12. The method of claim 11,
Wherein the pre-processing is performed according to the following equation.

In the above equation,

Is a preprocessed signal,

Is the right singular vector matrix of the FBMC transmit matrix,

Is an input signal. 14. The method of claim 13,
Wherein the step (c) allocates the power according to the following equation.

In the above equation,

Is a signal to which power is allocated,

Is an input signal,

Is a component of the diagonal matrix generated by performing the SVD on the FBMC transmission matrix. (a) receiving a transmitted signal using a QAM-based FBMC transmission matrix; And
(b) performing post-processing on the received signal,
In step (b), post-processing is performed using the left singular vector matrix U generated by performing SVD on the FBMC transmission matrix,
Wherein the received signal is received after pre-processing is performed using the right singular vector matrix V generated by performing SVD on the FBMC transmission matrix. 18. The method of claim 17,
Wherein the transmitted signal uses only one of an odd numbered subcarrier and an even numbered subcarrier. 18. The method of claim 17,
Before the step (b)
(c) converting the received signal to parallel,
Wherein the step (b) performs a post-process on the parallel-converted signal, and the received signal is converted into a serial signal and then received. 18. The method of claim 17,
Wherein the step (b) performs post-processing according to the following equation.

In the above equation,

Is a post-processed signal,

Is the left singular vector matrix of the FBMC transmission matrix,

Is the received signal. A computer-readable recording medium on which a program for performing a signal transmission method using an FBMC according to any one of claims 11 to 16 or a signal reception method using an FBMC according to any one of claims 17 to 20 is recorded.

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