KR100737747B1 - Method and apparatus for compensating mismatch of transmitter - Google Patents

Abstract

A method and an apparatus for compensating for mismatch of a transmitter are provided to compensate for a signal leakage component of a local oscillator as well as gain mismatch and phase mismatch of I/Q channels. A measurement signal generator(212) generates a measurement signal. A pre-compensator(208) pre-compensates the measurement signal to generate a test signal. A modulator(204) modulates the test signal. An envelop detector(214) detects envelop of the modulated test signal. A mismatch estimator(220) estimates mismatch of a transmitter(200) based on the detected envelope, and sets a parameter of the pre-compensator(208). The measurement signal generator(212) generates a measurement signal for measuring a signal leakage of a local oscillator, and the mismatch estimator(220) sets a parameter of the pre-compensator so that the pre-compensator(208) may pre-compensate the signal leakage of the local oscillator.

Description

Method and apparatus for compensating mismatch of transmitter

1 is a block diagram showing a configuration of a transmitter having a conventional mismatch compensation function.

2 is a block diagram showing a configuration of a transmitter having a mismatch compensation function according to an embodiment of the present invention.

3 is a block diagram illustrating a configuration of a precompensator according to an embodiment of the present invention.

4 is a flowchart illustrating a parameter setting process of a precompensator for precompensation of a mismatch according to an embodiment of the present invention.

5 is a flowchart illustrating a precompensation process for a plurality of mismatches according to an embodiment of the present invention.

The present invention relates to transmitter technology in a wireless communication system, and more particularly, to a method and apparatus for compensating for mismatches that may occur in a transmitter. The present invention also relates to a transmitter having a mismatch compensation function.

When transmitting data in wireless communication, the baseband signal is modulated at a carrier frequency and transmitted. At this time, the structure of a transmitter commonly used includes a heterodyne method that passes through an intermediate frequency (IF) stage before generating the final RF signal and a direct conversion method that modulates the baseband directly to the final RF signal without passing through the IF stage. .

The heterodyne method has excellent transmission performance, but it is disadvantageous to reduce the product weight, increase the unit cost, and also have difficulty in integrating it into a single chip for miniaturization because many elements such as SAW filter or IF amplifier are used in the IF stage. On the other hand, since the direct conversion method does not use an intermediate step, the number of devices is low, the unit cost is low, and it is also advantageous in miniaturization and light weight through a single chip. However, in the direct conversion method, since the frequency of the carrier of the final RF signal is the same as that of the local oscillator (LO), leakage of the LO signal may occur, and the gain of the carrier used for two orthogonal channels of I / Q and The problem of phase imbalance should also be taken into account. Both schemes have two orthogonal channels, I and Q channels, with a good gain and phase between the two channels to avoid EVM degradation of the transmitted signal. In a real transmitter, however, there is a gain and phase mismatch between the two orthogonal channels of I / Q, which causes a drop in transmission performance. In particular, in the direct conversion type transmitter, since the carrier frequency of the final RF signal is the same as that of a local oscillator (LO), a leakage problem of the LO signal may further occur.

The same problem has occurred in the receiver, and many methods have been proposed to solve the problem of the receiver. However, there are relatively few ways to solve the transmitter problem.

The transmitter 100 includes a precompensator 108, a digital analog converter 106, a quadrature modulator 104, a power amplifier 102 and an antenna.

On the other hand, the transmitter 100 may measure the measurement signal generator 112, the down converter 114, the square 116, the analog-to-digital converter 118, and the mismatch estimator to set the parameters of the precompensator 108. 120).

In the initialization mode, the selector 110 provides the precompensator 108 with the measurement signal generated by the measurement signal generator 112. The measured signal compensated by the pre-compensator 108 becomes an RF signal via the digital analog converter 106 and the quadrature modulator 104. The down converter 114 down converts the RF signal to a baseband signal. The baseband (baseband) signal is provided to the mismatch estimator 120 via a square 116 and an analog to digital converter 118. The mismatch estimator 120 estimates the mismatch of the transmitter and sets the parameters of the precompensator 108 based on the estimated mismatch.

Such conventional transmitters have multiple stages of local oscillator (not shown) for downconverter 114, which are complex to implement, solve only the imbalance problem between orthogonal channels and cannot compensate for local oscillator signal leakage. There is a limit point.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mismatch compensation method and an apparatus therefor capable of compensating and simply implementing mismatches generated in a transmitter.

Another object of the present invention is to provide a mismatch compensation method capable of compensating for a mismatch of a transmitter including a local oscillator signal leakage, and an apparatus therefor.

In addition, another object of the present invention is to provide a transmitter having a mismatch compensation function and which can be simply implemented.

The above objects are exemplary, and the present invention is not limited to the above objects.

In order to achieve the above object, a transmitter mismatch compensation method according to an embodiment of the present invention, modulating a test signal, detecting the envelope of the modulated test signal and the transmitter based on the detected envelope Setting a parameter of a pre-compensator to pre-compensate for a mismatch of.

The modulating the test signal modulates the measurement signal by a direct conversion method.

The setting of the parameter of the precompensator may set the parameter of the precompensator to precompensate the local oscillator signal leakage. In the setting of the parameter of the precompensator, the parameter of the precompensator may be set to precompensate a gain mismatch. In setting the parameter of the precompensator, the parameter of the precompensator may be set to precompensate phase mismatch.

The setting of the precompensator parameter may include estimating the local oscillator signal leakage according to a first test signal, and adjusting the parameters of the precompensator to compensate for the local oscillator signal leakage according to the estimation result of the local oscillator signal leakage. Setting, estimating the gain mismatch according to a second test signal, resetting a parameter of the precompensator to simultaneously compensate for the local oscillator signal leakage and the gain mismatch according to the estimation result of the gain mismatch. Estimating the phase mismatch according to a third test signal and simultaneously adjusting the local oscillator signal leakage and the gain mismatch and the phase mismatch according to the estimation result of the phase mismatch. It may include the step of resetting.

The first test signal is a signal for precompensating a first measurement signal using the precompensator with a parameter set for an initial test, and the second test signal is the precompensator with a parameter set to compensate for the local oscillator signal leakage. Is a signal that precompensates a second measurement signal by using the first test signal, and the third test signal is used to precompensate a third measurement signal by using the precompensator configured to compensate for the local oscillator signal leakage and the gain mismatch. May be a signal.

When setting and resetting the parameters of the pre-compensator, the parameters of the pre-compensator are set little by little so that leakage of the local oscillator signal, the gain mismatch and the phase mismatch are minimized.

In order to achieve the above object, a transmitter mismatch compensation device according to an embodiment of the present invention is a measurement signal generator for generating a measurement signal, a precompensator for compensating the measurement signal to generate a test signal, the test signal And a mismatch estimator for estimating a mismatch of a transmitter based on the detected envelope, and setting a parameter of the precompensator, a modulator for modulating a, an envelope detector for detecting an envelope of the modulated test signal.

The modulator modulates the test signal in a direct conversion manner.

The measurement signal generator generates a measurement signal for measuring a local oscillator signal leakage, and the mismatch estimator may set a parameter of the precompensator such that the precompensator precompensates the local oscillator signal leakage. The measurement signal generator may generate a measurement signal for measuring a gain mismatch, and the mismatch estimator may set a parameter of the precompensator to precompensate the gain mismatch. The measurement signal generator may generate a measurement signal for measuring a phase mismatch, and the mismatch estimator may set a parameter of the precompensator to precompensate the phase mismatch.

The precompensator includes a first multiplier that multiplies a first multiplication parameter by a first multiplication parameter, a second multiplier that multiplies a second multiplication parameter by a second channel signal, a first multiplier that adds output signals of the first multiplier and the second multiplier An adder, a second adder for multiplying the output signal of the first adder and the first addition parameter, and a third adder for adding the second channel signal and the second add parameter.

The first addition parameter, the second addition parameter and the second multiplication parameter are preset to 0, the measurement signal generator supplies a zero signal to the first channel signal and the second channel signal, respectively, The mismatch estimator may adjust the first and second addition parameters such that the detected envelope is zero.

After the first and second addition parameters are adjusted, the mismatch when the measurement signal generator supplies a first constant signal V0 to the first channel signal and a signal of zero to the second channel signal. The estimator sets the output value of the envelope detector as a first value, and the miss when the measurement signal generator supplies a first constant signal V0 to the second channel signal and a signal of zero to the first channel signal. A match estimator sets the output value of the envelope detector as a second value, and the mismatch estimator sets the first multiplication parameter to a result of dividing the second value by the first value and sets the second multiplication parameter to zero. Can be.

After the first and second multiplication parameters are set, the mismatch estimator outputs an output value of the envelope detector to a third value when the measurement signal generator supplies first constant signals as first channel signals and second channel signals, respectively. The measurement signal generator supplies the first constant signal to the first channel signal and supplies a second constant signal (-V0) that is 180 degrees out of phase with the first constant signal as a second channel signal. The mismatch estimator may set the output value of the envelope detector as a fourth value, and the mismatch estimator may reset the first and second multiplication parameters based on a third value and a fourth value.

In order to achieve the above object, a transmitter having a mismatch compensation function according to an embodiment of the present invention, a measurement signal generator for generating a measurement signal, a selector for selecting and outputting any one of the data signal and the measurement signal, A precompensator to precompensate the measurement signal to generate a test signal and precompensate the data signal, a modulator to modulate the precompensated data signal and the test signal, a power amplifier to amplify the modulated data signal, the amplification A mismatch estimator for estimating a mismatch of a transmitter based on an antenna for transmitting a data signal over a wireless channel, an envelope detector for detecting an envelope of the modulated test signal, and the detected envelope, and setting a parameter of the precompensator It includes.

With respect to the embodiments of the present invention disclosed in the text, specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments of the present invention, embodiments of the present invention may be implemented in various forms and It should not be construed as limited to the embodiments described in.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosure form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. For convenience of description, like reference numerals refer to like elements.

2 is a block diagram showing a configuration of a transmitter having a mismatch compensation function according to an embodiment of the present invention. For convenience of description, the transmitter will be described based on a direct conversion transmitter.

The transmitter 200 includes a precompensator 208 for precompensating a data signal to be transmitted, a digital analog converter 206 for converting a precompensated data signal to an analog transmission signal, and an RF transmission signal by modulating the analog transmission signal. And an orthogonal modulator 204 for outputting a signal, a power amplifier 202 for amplifying the RF transmission signal, and an antenna for outputting the amplified RF transmission signal through a wireless channel.

The transmitter 200 further includes a measurement signal generator 212, an envelope detector 214, an analog-to-digital converter 218, and a mismatch estimator 220 to set the parameters of the precompensator 208.

In the initialization mode, the selector 210 provides the precompensator 208 with the measurement signal generated by the measurement signal generator 212 instead of the data signal to be transmitted. The precompensator 208 precompensates the measurement signal according to a preset parameter to generate a test signal. The test signal is an analog test signal via the digital analog converter 206, and the analog test signal is an RF test signal (orthogonally modulated analog test signal) via the quadrature modulator 204.

Envelope detector 214 detects the envelope of the RF test signal instead of down converting the RF test signal. The envelope detector 214 may be implemented as a conventional low pass filter having a very simple structure compared to a down converter including a local oscillator. The detected envelope is provided to the mismatch estimator 220 after converting the analog-to-digital converter 218 into a digital signal.

The mismatch estimator 220 estimates the mismatch of the transmitter and sets the parameters of the precompensator 208 based on the estimated mismatch.

Hereinafter, a principle of estimating a mismatch of a transmitter and setting parameters of the precompensator 208 will be described with reference to FIG. 3.

3 is a block diagram illustrating a configuration of a precompensator according to an embodiment of the present invention.

The precompensator 208 includes a first multiplier 330 that multiplies the I-channel signal I (t) by the first multiplication parameter M1, and a second multiplication parameter M2 by the Q-channel signal Q (t). ), The first multiplier 340 multiplying the multiplier, the first adder 320 adding the output signals of the first and second multipliers 330 and 340, and the output signal and the first addition parameter of the first adder 320 A second adder 310 to multiply A1) and a third adder 350 to add the Q channel signal Q (t) and the second addition parameter A2.

)는 수학식 1로 표현될 수 있다.Output signal of quadrature modulator 204 of FIG.

) May be represented by Equation 1.

[Equation 1]

는 이득 미스매치이고,

는 위상 미스매치이고,

와

는 국부발진기 신호 누출에 의한 DC 오프셋이며,

는 RF 신호에 포함된 반송파의 각주파수이다.Where G is the signal gain to the output stage of quadrature modulator 204,

Is a gain mismatch,

Is a phase mismatch,

Wow

Is the DC offset due to local oscillator signal leakage,

Is the angular frequency of the carrier wave included in the RF signal.

In this case, the output signal L of the envelope detector 214 of FIG. 2 may be represented by Equation 2.

[Equation 2]

First, parameters A1, A2 and M2 are set to 0 and M1 is set to 1 to compensate for local oscillator signal leakage. In other words, the measurement signal generator 212 sends the measurement signal to the quadrature modulator 204 as it is without compensating for the generated measurement signal. The measurement signal generator 212 generates the measurement signal with I (t) = Q (t) = 0.

In this case, the output L1 of the envelope detector represented by Equation 2 may be expressed by Equation 3.

[Equation 3]

The mismatch estimator 220 adjusts the value of the first addition coefficient A1 and the second addition coefficient A2 until the output of the envelope detector 214 represented by Equation 3 becomes zero. At this time, the output of the envelope detector 214 is equivalent to substituting A1 instead of I (t) in Equation 2 and substituting A2 instead of Q (t).

When the output of the envelope detector 214 becomes zero, the addition coefficients A1 and A2 may be expressed as Equation 4 below.

[Equation 4]

The mismatch estimator 220 sets the adjusted addition coefficients A1 and A2 to the addition coefficients A1 and A2 of the precompensator 208 when the output of the envelope detector 214 becomes zero. That is, the signal leakage component can be eliminated by the precompensator 208.

Next, the mismatch estimator 220 estimates a gain mismatch. At this time, the parameters of the pre-compensator 208 are set as follows. Use the value set to compensate for local oscillator signal leakage. The measurement signal generator 212 generates a direct current signal having a magnitude of V0 (arbitrary value) as an I channel signal and a zero signal as a Q channel signal.

At this time, the output (L21) of the envelope detector 214 can be expressed as shown in Equation 5.

[Equation 5]

Next, the measurement signal generator 212 generates a DC signal having a magnitude of V0 as a Q channel signal and a signal of 0 as an I channel signal.

At this time, the output (L22) of the envelope detector 214 can be expressed as shown in equation (6).

[Equation 6]

)를 계산하면 수학식 7과 같이 표현할 수 있다.Equation 5 and Equation 6 allow gain mismatch (

) Can be expressed as Equation (7).

[Equation 7]

Meanwhile, when L22 / L21 is obtained from Equation 7, it can be expressed as Equation 8.

[Equation 8]

The mismatch estimator 220 estimates the phase mismatch after estimating the gain mismatch. At this time, the parameters of the pre-compensator 208 are set when the addition coefficients A1 and A2 are compensated for local oscillator signal leakage, and the first multiplication factor M1 is set to the M0 value obtained in Equation 8. The second multiplication coefficient M2 is set to zero.

The measurement signal generator 212 generates a measurement signal such that I (t) = Q (t) = V0. In this case, the output L31 of the envelope detector 214 may be expressed as in Equation (9).

[Equation 9]

Next, the measurement signal generator 212 generates a measurement signal such that I (t) = V0 and Q (t) = -V0. In this case, the output L32 of the envelope detector 214 may be expressed by Equation 10.

[Equation 10]

)는 수학식 11과 같이 표현할 수 있다.If we solve equation 9 and equation 10 together and solve the phase mismatch (

) Can be expressed as in Equation 11.

[Equation 11]

)를 사용하여 사전 보상기(208)의 곱셈계수들(M1, M2)들을 수학식 12와 같이 설정한다.The mismatch estimator 220 obtains a phase match obtained by

), The multiplication coefficients M1 and M2 of the precompensator 208 are set as in Equation 12.

[Equation 12]

Through this process, the parameters of the precompensator 208 may be set to compensate for mismatches (local oscillator signal leakage components), gain mismatches, and phase mismatches according to local oscillator signal leakage.

After the parameters of the precompensator 208 are set through the initialization process, the selector 210 of FIG. 2 selects and outputs a transmission data signal.

The precompensator 208 precompensates the transmission data signals I (t) and Q (t) to produce precompensated data signals I _p (t) and Q _p (t), which are precompensated data. The signals I _p (t) and Q _p (t) may be represented by equation (13) or equation (14).

[Equation 13]

[Equation 14]

In the above description, the process of compensating both the local oscillator signal leakage component, the gain mismatch, and the phase mismatch is described. However, the mismatch compensation device may be implemented to compensate only a partial mismatch.

For example, it is possible to precompensate only the local oscillator signal leakage component and phase mismatch when the present invention is applied to a transmitter in which gain mismatch has been eliminated in some way. Therefore, it is common knowledge in the art that it is possible to implement a mismatch compensator so as to precompensate only one or two mismatches of local oscillator signal leakage component and gain mismatch and phase mismatch. He who knows will know.

The mismatch estimator 220 may be implemented in hardware within the transmitter, but may be implemented in software such that a digital signal processor (DSP) provided separately from the transmitter performs the operation of the mismatch estimator 220. Also, although the precompensator 208 has been described based on a digital implementation, it is also possible to implement a precompensator that operates in an analog manner using parameters obtained by mismatch estimation.

4 is a flowchart illustrating a parameter setting process of a precompensator for precompensation of a mismatch according to an embodiment of the present invention.

The mismatch compensation device precompensates the transmission data signal to prevent signal quality degradation due to mismatch of the transmitter. Since the mismatch of the transmitters may vary from transmitter to transmitter when the actual transmitter is implemented, it is not possible to uniformly set the parameters of the pre-compensator. Instead, the parameters of the pre-compensator must be set for each transmitter.

The mismatch compensator first generates a measurement signal to set a parameter of the precompensator (S410). When the measurement signal is generated, the mismatch compensator precompensates the measurement signal to generate a test signal (S420). At this time, the parameter of the pre-compensator is set to a specific value in advance.

The mismatch compensator modulates the test signal to generate the RF signal (S430). In one embodiment, an orthogonal modulation method that directly converts a baseband to an RF band is used as a modulation method. However, heterodyne modulation may be used.

The mismatch compensator detects an envelope of the modulated test signal (S440). The miss match compensator estimates a mismatch of the transmitter based on the detected envelope (S450). The mismatch of a transmitter includes a local oscillator signal leakage component, a gain mismatch, a phase mismatch, etc., and may be any one of a local oscillator signal leakage component, a gain mismatch, and a phase mismatch, but a plurality of misses It may also include matches.

The mismatch compensator adjusts the parameters of the precompensator to compensate for the mismatch of the transmitter when the mismatch of the transmitter is estimated (S460).

The mismatch compensator determines whether the mismatch of the transmitter is minimized (S470), and repeats the processes of S410 to S460 when the mismatch of the transmitter is not minimized. The mismatch compensator terminates the parameter setting of the precompensator when the mismatch of the transmitter is minimized.

5 is a flowchart illustrating a precompensation process for a plurality of mismatches according to an embodiment of the present invention. The operation when the mismatch of the transmitter includes both the local oscillator signal leakage and the gain mismatch and the phase mismatch will be described.

The mismatch compensator first estimates a signal leakage of the local oscillator (S510). If the local oscillator mismatch is estimated, the mismatch compensator adjusts the parameters of the precompensator to compensate for the signal leakage of the local oscillator (S520).

When the local oscillator signal leakage is compensated for, the mismatch compensator estimates a gain mismatch (S530). If the gain mismatch is estimated, the mismatch compensator adjusts a parameter of the precompensator to compensate for the gain mismatch (S540).

When the gain mismatch is compensated, the mismatch compensator estimates the phase mismatch (S550). If the phase mismatch is estimated, the mismatch compensator adjusts a parameter of the precompensator to compensate for the phase mismatch (S560).

The mismatch compensation method and apparatus according to an embodiment of the present invention can be implemented simply because an envelope detector is used without using a down converter. Therefore, a high quality transmitter having a simple structure can be realized.

In addition, the mismatch compensation method and apparatus according to the embodiment of the present invention can compensate for gain mismatch and phase mismatch of the I / Q channel as well as local oscillator signal leakage components.

The above embodiments are all illustrative, and those skilled in the art may variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

Claims (19)

Modulating a test signal; Detecting an envelope of the modulated test signal; And Setting a parameter of the precompensator to precompensate for a local oscillator signal leakage to precompensate the mismatch of the transmitter based on the detected envelope. The method of claim 1, wherein the modulating the test signal comprises modulating the test signal by a direct conversion method. delete 2. The method of claim 1, wherein setting the parameter of the precompensator further sets a parameter of the precompensator to precompensate a gain mismatch. 2. The method of claim 1, wherein setting the parameter of the precompensator further sets the parameter of the precompensator to precompensate phase mismatch. The method of claim 1, wherein the setting of the parameter of the precompensator Estimating the local oscillator signal leakage according to a first test signal; Setting parameters of the precompensator to compensate for the local oscillator signal leakage in accordance with a result of the estimation of the local oscillator signal leakage; Estimating the gain mismatch according to a second test signal; Resetting a parameter of the precompensator to simultaneously compensate for the local oscillator signal leakage and the gain mismatch according to the estimation result of the gain mismatch; Estimating the phase mismatch according to a third test signal; And And resetting a parameter of the precompensator to simultaneously compensate for the local oscillator signal leakage, the gain mismatch, and the phase mismatch according to the estimation result of the phase mismatch. The method of claim 6, The first test signal is a signal for precompensating a first measurement signal using the precompensator with a parameter set for an initial test, and the second test signal is the precompensator with a parameter set to compensate for the local oscillator signal leakage. Is a signal that precompensates a second measurement signal by using the first test signal, and the third test signal is used to precompensate a third measurement signal by using the precompensator configured to compensate for the local oscillator signal leakage and the gain mismatch. Transmitter mismatch compensation method, characterized in that the signal. 8. The method of claim 7, wherein the first to third measurement signals are zero or direct current signals. 8. The method of claim 7, wherein the parameters of the precompensator are set to be changed little by little so as to minimize leakage of the local oscillator signal and the gain mismatch and the phase mismatch when setting and resetting the parameters of the precompensator. Transmitter mismatch compensation method. A measurement signal generator for generating a measurement signal; A precompensator for precompensating the measurement signal to generate a test signal; A modulator for modulating the test signal; An envelope detector for detecting an envelope of the modulated test signal; And A mismatch estimator for estimating a mismatch of a transmitter based on the detected envelope and setting a parameter of the precompensator, wherein the measurement signal generator generates a measurement signal for measuring a local oscillator signal leakage, And a mismatch estimator sets a parameter of the precompensator so that the precompensator precompensates the local oscillator signal leakage. The apparatus of claim 10, wherein the modulator modulates the test signal by a direct conversion method. delete 11. The method of claim 10, wherein the measurement signal generator further generates a measurement signal for measuring a gain mismatch, wherein the mismatch estimator adds a parameter of the precompensator to precompensate the gain mismatch. Transmitter mismatch compensation device, characterized in that set to. 11. The method of claim 10, wherein the measurement signal generator further generates a measurement signal for measuring phase mismatch, wherein the mismatch estimator adds a parameter of the precompensator to precompensate the phase mismatch. Transmitter mismatch compensation device, characterized in that set to. The method of claim 10, wherein the pre-compensator A first multiplier for multiplying the first channel signal by a first multiplication parameter; A second multiplier for multiplying a second channel signal by a second multiplication parameter; A first adder for adding output signals of the first multiplier and the second multiplier; A second adder that multiplies the output signal of the first adder by a first addition parameter; And And a third adder for adding the second channel signal and the second addition parameter. 16. The apparatus of claim 15, wherein the first addition parameter, the second addition parameter, and the second multiplication parameter are preset to zero, and the measurement signal generator is respectively set to zero with the first channel signal and the second channel signal. And a mismatch estimator adjusts the first and second addition parameters such that the detected envelope is zero. 17. The signal according to claim 16, wherein after the first and second addition parameters are adjusted, the measurement signal generator supplies a first constant signal V0 to the first channel signal and zero as the second channel signal. The mismatch estimator sets the output value of the envelope detector as a first value, and the measurement signal generator supplies a first constant signal V0 to the second channel signal and zeros to the first channel signal. When the signal is supplied, the mismatch estimator sets the output value of the envelope detector as a second value, and the mismatch estimator sets the first multiplication parameter as a result of dividing the second value by the first value. 2. A transmitter mismatch compensation device, characterized by setting a two multiplication parameter to zero. 18. The envelope of claim 17, wherein after the first and second multiplication parameters are set, the mismatch estimator is configured to supply the first constant signals to the first channel signal and the second channel signal, respectively. A second constant signal whose output value is a third value, wherein the measurement signal generator supplies the first constant signal to the first channel signal and is 180 degrees out of phase with the first constant signal as a second channel signal. When supplying (-V0), the mismatch estimator sets the output value of the envelope detector as a fourth value, and the mismatch estimator resets the first and second multiplication parameters based on a third value and a fourth value. Transmitter mismatch compensation device, characterized in that. A measurement signal generator for generating a measurement signal; A selector for selecting and outputting any one of a data signal and the measurement signal; A precompensator that precompensates the measurement signal to generate a test signal and precompensates the data signal; A modulator to modulate the pre-compensated data signal and the test signal; A power amplifier for amplifying the modulated data signal; An antenna for transmitting the amplified data signal over a wireless channel; An envelope detector for detecting an envelope of the modulated test signal; And A mismatch estimator for estimating a mismatch of a transmitter based on the detected envelope and setting a parameter of the precompensator, wherein the measurement signal generator generates a measurement signal for measuring a local oscillator signal leakage, And a mismatch estimator sets a parameter of the precompensator so that the precompensator precompensates the local oscillator signal leakage.

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