KR20100064707A - Apparatus for transmitting data using multiple input multiple output in a wireless communication system - Google Patents

Abstract

PURPOSE: A device for transmitting data using multiple input multiple output in a wireless communication system is provided to set operating mode by MIMO(Multi Input Multi Output) polar transmitter about transmission signal of low PAPR(Peak to Average Power Ratio), thereby improving efficiency of the transmitter. CONSTITUTION: A mode converters(211~213) determines polar transmission mode and LINC(Linear amplification with Nonlinear Components) transmission mode. Polar transmitters(220~240) provide the size information of signals outputted by the mode converters to each mode combiner. Polar transmitters perform modulation and amplification for transmission of signals outputted by the mode converters. LINC transmitters(251,252,253,254) provides the signal through link modulation of input signal of the mode converter to corresponding channel.

Description

Data transmission apparatus using MIO in wireless communication system {APPARATUS FOR TRANSMITTING DATA USING MULTIPLE INPUT MULTIPLE OUTPUT IN A WIRELESS COMMUNICATION SYSTEM}

The present invention relates to an apparatus for transmitting data in a wireless communication system, and more particularly, to an apparatus for transmitting data using a multiple input multiple output (MIMO) scheme.

In general, a wireless communication system is a system developed to provide communication to a user without limitation of distance and location. Such wireless communication systems are rapidly developing due to the rapid development of technology and the advantage that the user can communicate at any time while moving or desired. With the rapid development of technology, wireless communication systems are developing not only basic voice services but also high speed data services. As described above, in order to provide a high speed data service, a method in which a limited resource is shared among several users is used. This method is called a multiple access method. In general, a time division multiple access method for dividing a time to multiple users and a frequency division multiple access method for dividing a frequency and assigning it to multiple users and a code division multiple access method for dividing users into codes Etc. At present, the present invention uses a method of transmitting data using a plurality of methods instead of using only one method.

However, even in the case of using the above scheme, in general, it is difficult to transmit a lot of data to one user when only one antenna is used. Therefore, the MIMO scheme is introduced and used to compensate for this. In the MIMO wireless communication system, data to be transmitted is classified and allocated for each antenna, and the allocated data for each antenna is transmitted through each antenna, and the receiver uses the same or larger number of antennas as the transmitter antenna. Receive. In this manner, more data can be transmitted at once in transmitting data.

On the other hand, as described above, due to the finiteness of resources that divide radio resources by time, frequency, or code, there are many difficulties in transmitting a large amount of data at one time. Recently, Orthogonal Frequency Division Multiplex (hereinafter, referred to as "OFDM"). 2. Description of the Related Art A wireless communication system using an " orthogonal frequency division multiple access (hereinafter referred to as " OFDMA ") scheme is emerging.

In configuring a transmitter of a wireless communication system having a high peak to average power ratio (hereinafter referred to as " PAPR "), such as a wireless communication system using OFDM or OFDMA, the most important thing is to satisfy linearity and improve efficiency. To maximize. For this reason, a structure that has recently been studied in relation to the transmitter of a wireless communication system is a link amplifier (Linear amplification with Nonlinear Components, hereinafter referred to as "LINC").

The LINC amplifier divides the signal to be transmitted into two vectors of the same size, and amplifies each of the separated vectors using two power amplifiers that operate completely nonlinearly so that the sum of the output vectors creates the desired signal size. to be. In the LINC amplifier, a signal having a peak to average power ratio (hereinafter referred to as "PAPR") is input to an input terminal of the power amplifier. Therefore, there is an advantage in using a high efficiency power amplifier when using a LINC amplifier.

Next, a case of using a LINC amplifier in the MIMO method will be described with reference to FIG. 1.

1 is an exemplary diagram when a transmitter is configured using a LINC amplifier in a MIMO system.

A transmitter of a MIMO wireless communication system has a MIMO modulator 101 for modulating data or signals to be transmitted in a MIMO fashion. And LINC transmitters 110, 120, and 130 corresponding to the respective antennas ANT # 1, ANT # 2, ..., ANT #n. The MIMO modulator 101 modulates and outputs a signal or data to be transmitted to a baseband signal processing apparatus that performs a modem function. The modulated output signals are complex signals in which different data or signals corresponding to respective channels, i.e., antennas ANT # 1, ANT # 2, ..., ANT #n, are modulated. Therefore, even the I ₁ generated by the first to transmit a first antenna (ANT # 1) (t) , Q 1 (t) signal and a second antenna that is I ₂ (t) seongsaeng to transmit to (ANT # 2) , I _N (t) and Q _N (t) generated for transmission to the Q ₂ (t) and the N th antenna ANT #N are respectively converted into complex signals. The signals thus converted are input to LINC transmitters 110, 120,..., 130 for transmission to respective transmit antennas.

Since each of the LINC transmitters 110, 120,..., 130 has the same configuration, the signal input to the first LINC transmitter 110 will be described. First, the LINC converter 111 generates two complex signals having the same magnitude by vector separating the input complex signals by inputting the complex signal output of the MIMO multi-channel modulator 101. That is, two complex signals are generated for the I ₁ (t) signal and two complex signals are generated for the Q ₁ (t) signal. The four complex signals thus generated are input to corresponding digital-to-analog converters 112, respectively. The digital-to-analog converters 112 convert four complex signals generated by the LINC converter 111 into analog signals and output the analog signals. Each signal converted into an analog signal as described above is input to two phase modulators 113 provided corresponding to I ₁ (t) and Q ₁ (t). The two complex signals converted to analog are of constant magnitude through the complex frequency mixing device in the phase modulator 113, and a phase modulated RF signal is generated. The PAPR of the phase modulated RF signal is thus 1.

The RF signals phase modulated by the phase modulator 113 are each power amplified by the power amplifier 105. As the power amplifier used herein, a high efficiency amplifier having a nonlinear operation may be used. The power amplified RF signal is combined in the combiner 115, restored to the original signal, and radiated through the first antenna ANT # 1.

However, as described above, when using MIMO technology, data or signals transmitted for each antenna are classified and transmitted. In the case of using a LINC amplifier, two complex signals are transmitted by vector separation from one complex signal to be transmitted to each antenna. This doubles as four digital-to-analog converters are required. This means that when the transmitter is configured using the MIMO method, many devices are required as compared to the case where the LINC amplifier is not used. Therefore, when the MIMO transmitter is configured using the LINC amplifier, the cost increases, which increases the manufacturing cost of the product and also causes difficulty in miniaturization.

To overcome this problem, a polar transmitter can be used. A polar transmitter is a system that transmits a signal separated into a phase component and a magnitude component instead of sending the complex signal into an in-phase component (I component) and an in-phase component (Q component). The phase signal component is always applied to the power amplifier as a signal having a constant magnitude through the phase modulator, and the magnitude signal component is configured so that the final RF output becomes a complex transmission signal by varying the power of the power amplifier.

However, such a polar transmitter has a disadvantage in that it is difficult to transmit a high PAPR transmission signal and a narrow transmission power range.

Accordingly, the present invention provides a transmitter capable of operating at high PAPR in a wireless communication system using a MIMO scheme.

In addition, the present invention provides a transmission apparatus that can reduce the complexity of the circuit in a wireless communication system using the MIMO scheme.

In addition, the present invention provides a transmission apparatus capable of miniaturization in a wireless communication system using a MIMO scheme.

In addition, the present invention provides a transmission apparatus that can reduce the manufacturing cost in a wireless communication system using a MIMO scheme.

An apparatus according to an embodiment of the present invention is a device for transmitting a signal in a transmitter that transmits a signal in multiple channels by using a MIMO scheme, and outputs to each channel by modulating the data to be transmitted for each channel. And determining a polar transmission mode and a link transmission (LINC) transmission mode by comparing the average power ratio (PAPR) of the MIMO modulated signal and the size information of the MIMO modulated signal with a first predetermined threshold value for each channel. Mode converters provided for each channel and magnitude information of signals outputted from the respective mode converters are provided to each mode combiner, and provided for each channel modulated and amplified to transmit the signal outputted from the mode converters. Polarized transmitters, a link transmitter configured to link-modulate a signal input from the mode converter to a corresponding channel; It includes an engaging portion that combines the polar transmitter with the signal of the transmission link according to the channel.

In the present invention, in order to more efficiently use a MIMO LINC transmitter that uses a lot of hardware resources, the operation mode is set to a MIMO polar transmitter for a low PAPR transmission signal and a MIMO polar transmitter for a large transmission signal PAPA. An operating mode combining LINC transmitters is set, and a signal having a high PAPR and low transmission power by power control is set to an operating mode combining a direct conversion method and a LINC transmitter to increase the efficiency of the transmitter.

Hereinafter, the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, a part obvious to those skilled in the art will be omitted so as not to disturb the gist of the present invention. In addition, it is to be noted that each of the terms described below are only used to help the understanding of the present invention, and may be used in different terms despite the same purpose in each manufacturing company or research group.

In the present invention, the configuration of the MIMO transmitter is replaced with a simple polar transmitter instead of the LINC, and the LINC path is added to process the high PAPR signal. In addition, the direct conversion mode can be set to extend the power range. Implementing the transmitter in this configuration, it is possible to process a high PAPR signal in the processing of the MIMO transmission signal, as well as to expand the transmitter and power range of high efficiency. In addition, there is an advantage that the user can set the criteria for the mode switching to reconstruct the transmission structure suitable for the characteristics of the transmission signal. An embodiment according to the present invention will now be described with reference to the accompanying drawings.

2 is a block diagram of a LINC transmitter using a MIMO scheme according to a preferred embodiment of the present invention.

The transmitter of the wireless communication system according to the present invention has a MIMO modulator 201 for modulating data or signals to be transmitted in a MIMO scheme. In addition, the mode converters 211, 212, ..., 213 corresponding to the respective antennas ANT # 1, ANT # 2, ..., ANT #n and the respective mode converters 211, 212, ..., 213 are provided. It has corresponding polar transmitters 220, 230,..., 240. As described in the related art, the MIMO modulator 201 modulates and outputs a signal or data to be transmitted to a baseband signal processing apparatus that performs a modem function. The modulated output signals are complex signals in which different data or signals corresponding to respective channels, i.e., antennas ANT # 1, ANT # 2, ..., ANT #n, are modulated. Therefore, I ₁ (t), Q ₁ (t) signals generated for transmission to the first antenna ANT # 1 and I ₂ (t), Q ₂ generated for transmission to the second antenna ANT # 2. I _N (t) and Q _N (t) generated for transmission to (t) and the Nth antenna ANT #N are signals in which different data are modulated into a complex signal, respectively. The modulated signals are input to the mode converters 211, 212,..., 213 corresponding to the respective transmit antennas.

The mode converters 211, 212,..., 213 all have the same configuration and perform the same operation. In addition, each of the polar transmitters 220, 230,..., 240 has the same configuration and performs the same operation. Therefore, only modulated signals transmitted to the first antenna ANT # 1 will be described here. Since signals transmitted to the other antennas ANT # 2,..., ANT #N are also transmitted in the same form as signals transmitted to the first antenna ANT # 1, redundant description thereof will be omitted.

, cos

성분으로 변환되어 출력된다. 또한 입력된 신호가 LINC 모드인 경우 입력된 복소 신호를 LINC 복소 신호로 변환하여 스위칭부(251) 및 복소 변조기(221)로 출력한다. 그리고 직접 변환모드인 경우 입력 신호를 입력된 복소 신호를 그대로 복소 변조기(221)로 출력한다.The mode converter 211 determines a transmission mode according to the magnitude of the signal for transmitting the input complex signal and the PAPR required for the signal. The mode converter 211 according to the present invention checks the above conditions and determines a signal to be transmitted as one of three modes, a polar transmission mode, a direct conversion mode, and a LINC transmission mode, and the signal corresponding to the corresponding mode. Convert The configuration and operation of the mode converter 211 will be described in more detail with reference to FIG. 3 to be described later. If the mode converter 211 determines that the signal to be transmitted is the polar transmission mode, the input complex signal is converted into a phase signal and input to the polar transmitter 220. That is, sin, the phase component of the signal

, cos

It is converted into components and output. In addition, when the input signal is in the LINC mode, the input complex signal is converted into a LINC complex signal and output to the switching unit 251 and the complex modulator 221. In the direct conversion mode, the complex signal inputted from the input signal is output to the complex modulator 221 as it is.

The size converter 222 of the polar transmitter 220 extracts a magnitude value of the input signal from the input signal, and determines the power amplification factor of the power amplifier according to the extracted value according to the operation of the polar transmitter. That is, the magnitude converter 222 determines the amplification factor of the power amplifier 223 in response to the magnitude of the input signal and provides the amplification factor value to the power amplifier. In FIG. 2, the signal provided from the magnitude converter 222 to the mode converter 211 is not shown. This will be described in more detail with reference to FIG. 3 to be described later.

, cos

의 신호는 복소 변조기(221)에서 복소 변조되어 전력 증폭기(223)로 입력된다. 전력 증폭기(223)는 복소 변조되어 입력된 위상 성분의 신호를 크기 변환기(222)로부터 제공되는 증폭률 정보를 이용하여 증폭한 후 출력한다.Sin, which is a phase component that is determined and output from the mode converter 211 to a polar transmitter,

, cos

Signal is complex modulated by the complex modulator 221 and input to the power amplifier 223. The power amplifier 223 amplifies and outputs the signal of the phase modulated complex input signal using the amplification factor information provided from the size converter 222.

Meanwhile, the LINC transmitter 250 includes a switching unit 251, a complex modulator 252, a power amplifier 253, and a power divider 254 according to the present invention. The switching unit 251 switches and outputs a signal to be transmitted for each channel. The complex modulator 252 modulates the switched complex signal in this manner, converts the complex signal into an RF signal, and then inputs the complex signal to the power amplifier 253. The power amplifier 253 amplifies the input signal with a predetermined predetermined amplification level and inputs it to the power divider 254. In this case, the power amplifier 253 amplifies all the input signals with the same power. The power divider 254 divides the input signal into each channel, that is, each antenna, and outputs the divided signal to the combiner 260. Therefore, the signal output from the polar transmitters 220, 230,..., 240 and the signal output from the power divider 254 are vector-coupled in the combiner 260 to correspond to the respective antennas ANT # 1 and ANT #. 2,…, ANT #N). The mode converters 211, 212,..., 213 and the switching block 251 described above may be implemented in a digital circuit, and the complex modulator 204, the power amplifier 206, the magnitude converter 205, and the like may be generally used. It can be implemented in an RF circuit configuration.

Referring to the operation of FIG. 2 again, most of the signals to be transmitted are signals with high PAPR. Therefore, these signals should be operated as a polar transmitter, if the PAPR is a high signal to operate in the LINC mode, if higher than the direct conversion method. This may use a predetermined threshold. That is, the first threshold value is used as a threshold for distinguishing the operation of the polar transmitter and the LINC transmitter, and the second threshold value uses the operation of the polar transmitter and direct conversion. Then, when different data to be transmitted for each channel, that is, for each antenna, is input in the MIMO modulator, the mode converters 211, 212, 213,..., 214 provided for each channel determine the transmission mode. At this time, most of the signals input to each mode converter are signals capable of operating in the polar transmission mode. However, some signals require LINC operation or direct conversion operation. Accordingly, when the LINC operation is required, the mode converter 211 divides the input I _x (t) and Q _x (t) into two different vector signals according to the LINC operation. Here, I _x (t) and Q _x (t) mean one signal to be transmitted on an arbitrary channel. As such, two vector signals corresponding to I _x (t) or Q _x (t) are input to the complex modulator of the polar transmitter, and the other two vector signals are input to the switching 251. Therefore, the switching unit 251 outputs to the complex modulator 252 through a switching operation for transmitting to each channel. Therefore, the complex modulator of the polar transmitter corresponding to the channel to be provided in the LINC mode and the complex modulator 252 of the LINC transmitter 250 complex modulate the vector signals and output the complex signals. The power amplifier 253 is then amplified in power and then provided to the corresponding channel through the power divider 254, coupled in the combiner of the corresponding channel of the combiner 260 and radiated through the antenna.

If a direct conversion mode is required, the signal of the channel is input directly to the complex modulator without special processing in the mode converter 211.

The path for implementing the MIMO transmitter illustrated in FIG. 2 described above with LINC is configured as one channel by a switching operation. In addition, when each channel performs the LINC operation, more than 90% of the transmission signals operate in the polar transmission mode, and the remaining 10% of the transmission signals operate in the LINC mode, even if some of the multiple channels operate as LINC. It is possible to operate as a LINC transmitter because the probability of overlapping through the switching unit 251 of the ().

Referring to FIG. 2 as compared to FIG. 1, since only the LINC operation is performed in FIG. 1, two power amplifiers are required for each channel. However, in the present invention of FIG. 2, since the power amplifier requires one more power amplifier than the number of all transmission channels, the circuit configuration can be simplified and the efficiency can be increased.

3 is an internal configuration diagram of a mode converter and a size converter according to an exemplary embodiment of the present invention. In FIG. 3, the size converter in the configuration of FIG. 2 will be described with reference numeral 222. However, as described above, since all the size converters of FIG. 2 have the same configuration, it should be noted that the description is representative of one of the size converters of the polar transmitters 220, 230,..., 240.

The complex signal output from the MIMO converter 201 is input to the three-phase determiner 311 and the magnitude converter 222 of the mode converter.

First, the size converter 222 will be described. The magnitude converter 222 is a magnitude converter of a general polar transmitter, and includes a signal magnitude extractor 301 and a sigma delta modulator 302. The signal magnitude extractor 301 calculates and outputs a magnitude value of the input signal. That is, the magnitude values of the input I _x (t) and Q _x (t) signals are calculated and output. The magnitude value thus output is input to the sigma delta modulator 302 and the three-phase determiner 311. The sigma delta modulator 302 determines an amplification factor of the power amplifier in response to the input magnitude value, and outputs a power amplification factor control value corresponding thereto.

Meanwhile, the three-phase determiner 311 determines a mode using the signal magnitude value input from the signal magnitude extractor 301. That is, one of the polar transmission mode, the LINC transmission mode, and the direct conversion transmission mode is determined. In FIG. 3, each of the modes is divided into mode 1, mode 2, and mode 3 to display an input signal path. Mode 1 is a polar transmission mode, mode 2 is a direct conversion transmission mode, and mode 3 is a LINC transmission mode. The three-phase determiner 311 may determine the polar transmission mode, the direct conversion transmission mode, and the LINC transmission mode by comparing the first threshold value and the second threshold value using the magnitude of the signal input from the signal magnitude extractor 301. have. Alternatively, the three operation modes may set an operation threshold differently according to a signal size and a PAPR characteristic of the signal, and allow the three-phase determiner 311 to set an operation mode according to the threshold value. have.

(t) + jsin

(t)의 신호가 된다. 따라서 이러한 위상 성분 신호는 결합기(317)를 통해 복소 변조기로 입력된다. 또한 신호 크기 추출기(301)에서 추출된 크기 신호는 시그마 델타 변조기(302)에서 시그마 델타 변조되어 전력 증폭기의 증폭률을 결정한다. 따라서 전력 증폭기는 PAPR이 1인 신호를 입력으로 동작하므로 스위칭 동작만을 필요로 하는 고효율의 전력 증폭기 사용이 가능한 폴라 송신기의 동작을 수행할 수 있게 된다.Next, the case where the polarity transmission mode is determined by the three-phase determiner 311 will be described first. When the three-phase determiner 311 is determined to be a polar transmission mode, the three-phase determiner 311 generates a control signal for outputting the path of the mode selector 314 to the signal phase extractor 315 and provides it to the mode selector 314. The three-phase determiner 311 outputs the input signal to the combiner 313. Then, the combiner 311 outputs an input signal to the mode selector 314 since only one signal is input. As described above, since the signal output path of the signal input to the mode selector 314 is determined by the signal phase extractor 315 by the control signal, the input signal may be provided to the signal phase extractor 315. The mode selector 314 may be implemented as a demultiplexer or a switch. When a signal is input from the mode selector 314, the signal phase extractor 315 calculates and outputs a phase component of the input signal. The phase component of the output signal as described above is cos as described in FIG.

(t) + jsin

It becomes a signal of (t). Therefore, this phase component signal is input to the complex modulator through the combiner 317. In addition, the magnitude signal extracted by the signal magnitude extractor 301 is sigma delta modulated by the sigma delta modulator 302 to determine the amplification factor of the power amplifier. Therefore, since the power amplifier operates as a signal having a PAPR of 1 as an input, it is possible to perform the operation of a polar transmitter capable of using a high efficiency power amplifier that requires only switching operation.

Next, a case where the direct conversion transmission mode is determined by the three-phase determiner 311 will be described. When the three-phase determiner 311 is determined as the direct conversion transmission mode, the three-phase determiner 311 generates a control signal for outputting the path of the mode selector 314 to the signal passer 316 and provides it to the mode selector 314. The three-phase determiner 311 outputs the input signal to the combiner 313. Then, the combiner 311 outputs an input signal to the mode selector 314 since only one signal is input. Accordingly, since the signal output path of the signal input to the mode selector 314 is determined to the passer 316 by the control signal, the input signal is provided to the passer 316. Here, the passer 311 may be configured as a delayer having a predetermined delay time. The reason why the passer 311 has a predetermined delay time is to transmit a signal through multiple channels so that it can be transmitted at the same time as a signal of another channel. However, if the delay time is not necessary, it may be input through a general line. The signal via the pass 317 is input via the combiner 317 to the complex modulator.

Finally, the case in which the 3-phase determiner 311 is determined to be the LINC transmission mode will be described. When the three-phase determiner 311 is determined as the LINC transmission mode, the three-phase determiner 311 generates a control signal for outputting the path of the mode selector 314 to the pass-through 316 and provides it to the mode selector 314. In addition, the three-phase determiner 311 provides the input signal to the out-phase signal generator 312. When the out-phase signal generator 312 receives the I _x (t) signal and the Q _x (t) signal like a typical LINC converter, it generates each signal as two vector signals. That is, the I _x (t) signal is composed of two vectors, and the Q _x (t) signal is composed of two vectors. Two vector components of the four vector signals generated as described above are provided to the combiner 313, and the remaining two signals are provided to the switching unit 251 of the LINC transmitter 250. The combiner 311 then outputs the input signal to the mode selector 314 since the input signal is only the signal received from the out-phase signal generator 312. In this way, the signal input to the mode selector 314 is output to the passer 316 because the output path of the signal is determined by the passer 316 by the control signal. Here, the passer 311 may be configured as a delayer having a predetermined delay time. The reason why the passer 311 has a predetermined delay time is to transmit a signal through multiple channels so that it can be transmitted at the same time as a signal of another channel. However, if the delay time is not necessary, it may be input through a general line. The signal via the pass 317 is input via the combiner 317 to the complex modulator.

Thus, two vector components for one signal are input to the complex modulator via combiner 313, mode selector 314, pass-through 316, combiner 317, and two vectors for the other signal. The component is input to the complex modulator 252 through the switching unit 251. As described above, the complex modulated signal to the complex modulator located in the polar transmitter is amplified by the power amplifier and input to the combiner. In addition, the signal input to the complex modulator 252 through the switch unit 251 of the LINC transmitter is complex modulated by the complex modulator 252 and then amplified by the power amplifier 253 to the corresponding channel in the divider 254. Input to the corresponding combiner.

4 is a diagram illustrating an operation mode setting for using a transmitter according to an embodiment of the present invention.

4 shows the spectrum of an OFDM modulated signal with a PAPR of 10.7 dB, with an average power of 0.085 when the maximum peak power of this signal is 1; In addition, the average signal size is calculated as 0.29, the average signal size is the position indicated by the reference numeral 402. At this time, the size of the signal that can be operated as a polar transmitter is a power control maximum value of the power amplifier can be set so that the power can be changed by about 20dB. Thus, the magnitude of the signal can be operated as a polar transmitter up to about 0.1 indicated by reference numeral 401. The rest of the region can be set to enable LINC transmitter operation. And if you need more than 20dB of variable range of transmission power, the mode can be set by switching the polar transmission section to direct conversion transmission method.

The drawings and detailed description of the invention are merely exemplary of the invention, which are used only for the purpose of illustrating the invention and are not intended to limit the scope of the invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1 is an exemplary diagram when a transmitter is configured using a LINC amplifier in a MIMO system;

2 is a block diagram of a LINC transmitter using a MIMO scheme according to an embodiment of the present invention;

3 is an internal configuration diagram of a mode converter and a size converter according to an exemplary embodiment of the present invention;

4 is a diagram illustrating an operation mode setting for using a transmitter according to an embodiment of the present invention.

Claims (12)

An apparatus for transmitting a signal in a transmitter for transmitting a signal in multiple channels using a MIMO scheme, The polar transmission mode and the link (LINC) transmission mode are determined by comparing the peak-to-peak average power ratio (PAPR) of the MIMO modulated signal and the size information of the MIMO modulated signal with the first predetermined threshold value for each channel. Mode converters provided for each channel; A polar transmitter configured to provide magnitude information of signals output from the respective mode converters to the respective mode combiners, and for each channel to modulate and amplify the signal output from the mode converter; And a link transmitter for link-modulating the signal input from the mode converter to a corresponding channel. The method of claim 1, And a coupling unit for combining the signals of each of the polar transmitter and the link transmitter for each channel. The method of claim 1, wherein the respective mode converters, The mode information is determined using the magnitude information and the PAPR information for each channel, and the mode selector outputs the signal to the phase signal extractor in the polar transmission mode. Outputs a signal input in the in-phase to the mode selector, controls the mode selector to output a signal to the pass-through in the link transmission mode, and outputs the signal input in the quadrature and in-phase signals to the out-phase signal generator A data transmission apparatus using MIMO in a wireless communication system including a three-phase determiner for outputting. The method of claim 3, wherein the mode converters, And a signal phase extractor for converting a complex signal input in quadrature and in-phase to a complex phase signal and outputting the complex phase signal. The method of claim 3 or 4, wherein the mode converters, A delay unit for delaying a complex signal input in the quadrature phase and in-phase phase for a predetermined time; And a mode selector for outputting a signal to one of the phase extractor and the delayer. The method of claim 1, wherein each mode converter, A radio that determines a signal to be transmitted in a direct conversion mode when a peak to average power ratio (PAPR) of the MIMO modulated signal and the magnitude information of the MIMO modulated signal are greater than or equal to the first threshold and greater than a second predetermined threshold; Data transmission apparatus using MIMO in a communication system. The method of claim 6, wherein the respective mode converters, The mode information is determined using the magnitude information and the PAPR information for each channel, and the mode selector outputs the signal to the phase signal extractor in the polar transmission mode. Outputs a signal input in the in-phase to the mode selector, controls the mode selector to output a signal to the pass-through in the link transmission mode, and outputs the signal input in the quadrature and in-phase signals to the out-phase signal generator And a three-phase determiner for controlling the mode selector to output a signal to the pass-through in case of the direct transmission mode and outputting the signals input in the quadrature and in-phase to the selector. Data transmission apparatus using MIMO. The method of claim 7, wherein the respective mode converters, And a signal phase extractor for converting a complex signal input in quadrature and in-phase to a complex phase signal and outputting the complex phase signal. The method of claim 8, wherein the respective mode converters, A delay unit for delaying a complex signal input in quadrature and in-phase with a predetermined time; And a mode selector for outputting a signal to one of the phase extractor and the delayer. 10. The method of any one of claims 6 to 9, wherein the respective mode converters are: The complex signal input in the quadrature phase and the in-phase phase is separated into two different vector signals for each complex signal, and two signals of the separated signals are output to the mode selector and the other two signals are output to the link transmitter. -A data transmission apparatus using MIMO in a wireless communication system further comprising a phase signal generator. 10. The method of any one of claims 1 to 3 or 6 to 9, wherein each of the polar transmitters, A complex modulator for complex modulating a signal input from a mode converter corresponding to a corresponding channel; A magnitude converter for detecting the magnitude of the signal input from the mode converter, providing the detected magnitude information to the mode converter, and determining the amplification factor of the signal; And a power amplifier for amplifying and outputting the output signal of the complex modulator at the determined amplification factor. The link transmitter according to any one of claims 1 to 3 or 6 to 9, wherein A switching unit for switching a signal input from each mode converter to a corresponding channel; A complex modulator for modulating the switched signal; A power amplifier for amplifying the complex modulated signal; And a power divider for providing the power amplified signal to a corresponding channel through the combiner.

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