KR20120054773A - Apparatus and method for calibration in wireless comunication system - Google Patents

Abstract

PURPOSE: A calibration apparatus in a wireless communication system and method thereof are provided to reduce errors and setup time related to calibration methods according to environment change by using training signals. CONSTITUTION: A modem(100) selects a calibration method which uses one tone signal or two tones signal. When the calibration method which uses the two tones signal is selected, the modem selects I channel or Q channel. The modem provides training signals to a transmission and reception unit(150) through the selected channel. The transmission and reception unit increases the frequency of the training signal through a transmission path. The reception path receives feedbacks related to the increased frequency of the training signal from a duplexer(170).

Description

Calibration apparatus and method in a wireless communication system {APPARATUS AND METHOD FOR CALIBRATION IN WIRELESS COMUNICATION SYSTEM}

The present invention relates to calibration of a receiver circuit in a wireless communication environment, and more particularly, to an apparatus and a method for reducing a calibration time when performing a plurality of types of calibrations.

Various kinds of correction circuits and algorithms exist to compensate for the nonlinear characteristics of the RF circuit inside the wireless communication receiver. For example, the correction circuits and algorithms include gain correction calibration, DC offset calibration, I / Q imbalance calibration, 2nd input intercept point calibration, and the like.

Looking briefly at each calibration algorithm, first, the IIP2 calibration has a technique of correcting / processing a transmission signal by looping back to a receiving end through a leakage path (US patent "ADPATIVE IIP2 CALIBRATION" (public number) US2010 / 0093298). The I / Q mismatch calibration is a technology that simultaneously handles I / Q mismatches occurring at the transmitter and the receiver by using an additional loop-back control path (US patent, I / Q CALIBRATION OF TRANSMIT AND RECEIVE). PATHS IN OFDM FDD COMMUNICATION SYSTEMS (Publication US2010 / 0027689). The gain calibration is a method of compensating by measuring a received signal strength indication (RSSI) in a modem when a test continuous wave (CW) is input to an antenna using an external device. And lastly, the DC offset calibration is a method of searching for a register value of which the difference is minimum by comparing the DC values of positive and negative paths at the RFIC output with the modem and accumulating and comparing them with each other.

The I / Q mismatch calibration and the IIP2 calibration may also apply 1 tone (I, Q) or 2 tone (IIP2) to an external device, and measure the CW tone generated in the calculation by the modem unit. Search for a register value that causes its value to be minimum. The calibration method using the external equipment requires a lot of calibration time in the final verification and mass production process, and various loop back methods have been proposed to be processed in the following RFIC itself.

 Methods of performing calibration include a method using an external device (hereinafter referred to as a factory calibration) and a loop back method through an internal circuit.

On the other hand, the calibration of the receiver has conventionally performed a lookback method and a factory calibration method in accordance with the requirements. In addition, in order to satisfy various requirements for various types of calibrations in various environments (channels / temperatures / samples, etc.), calibration methods and conditions for each parameter are different.

Therefore, there is a need for an apparatus and method for minimizing factory calibration for each item and for reducing final verification time and mass production time for a certain yield.

An object of the present invention is to provide a calibration apparatus and method in a wireless communication system.

Another object of the present invention is to provide a look back calibration apparatus and method for minimizing factory calibration for unifying various different calibration environments of a receiver and interworking with external equipment.

According to a first aspect of the present invention for achieving the above objects, in a calibration apparatus in a wireless communication system, whether to perform a calibration using one tone signal or a calibration using two tone signals, two When performing calibration using a tone signal, one of the I channel and the Q channel is selected to provide a training signal to the transceiver only through the selected channel, and the frequency of the training signal is transmitted through a transmission path to the duplexer. The transceiver and the duplexer feeding back the frequency upconverted training signal from the transceiver to a reception path, wherein the transceiver frequency downconverts the feedback training signal from the duplexer to provide the modem; The modem uses one tone signal When performing the calibration, a training signal is provided to both the I and Q channels to the transceiver, and the transceiver up-converts the training signal for each of the I and Q channels through a transmission path and up-converts the frequency. Envelopes a training signal and transmits it to the duplexer, and down-converts the training signal fed back from the duplexer to provide the modem, and the duplexer feeds the frequency up-converted training signal from the transceiver to a reception path. Characterized in that.

According to a second aspect of the present invention for achieving the above objects, in a calibration method in a wireless communication system, the modem selects whether to perform calibration using one tone signal or calibration using two tone signals. And when the modem performs calibration using a two-tone signal, selecting one of an I channel and a Q channel to provide a training signal to a transceiver only through a selected channel, and a transceiver to provide the training signal. Transmitting the frequency up-converted through the transmission path to the duplexer; feeding the frequency up-converted training signal from the transceiver to the reception path; and transmitting, by the transceiver, the feedback signal from the duplexer. Frequency down-conversion to provide the modem to the modem. In addition, when the modem performs a calibration using one tone signal, providing a training signal to both the I channel and the Q channel to the transceiver, and the transceiver transmits the training signal to the transmission path. A process of up-converting the frequency for each of the I and Q channels, transmitting, by the transceiver, the frequency-converted training signal to the duplexer, and training the frequency-upconverted training from the transceiver by the duplexer The method may further include feeding back a signal to a reception path, and providing, by the transceiver, a frequency downconversion of the training signal fed back from the duplexer to the modem.

As described above, by performing the four calibration cases in one predetermined lookback environment, it is possible to reduce the calibration error and the setup time according to various environmental changes. In addition, the calibration control algorithm is simplified by controlling the calibration items at the receiving end through the same environment and calculating and restoring only a specific frequency after generating a training signal of 1 Tone at the modem. And, in the case of gain calibration that takes the most time in the past, it is configured as a hybrid gain calibration mode, that is, the number of calibration points whose absolute value is obtained using the difference between the gain mode and the channel change through the lookback mode. This reduces the overall calibration time. Finally, the DC offset calibration process using the tone signal can be applied according to the required value because the modem signal processing is significantly reduced than the process of accumulating the conventional DC level.

1 is a calibration device in a wireless communication system according to an embodiment of the present invention;
2 is a calibration device using two tones in a wireless communication system according to an embodiment of the present invention,
3 is a calibration device using one tone in a wireless communication system according to an embodiment of the present invention,
4 is a flowchart for a calibration method in a wireless communication system according to an embodiment of the present invention;
5 is a flowchart illustrating a hybrid gain calibration method in a wireless communication system according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description of the present invention, detailed descriptions of related well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, the present invention will be described with respect to a calibration apparatus and method using a look back in a wireless communication system.

1 illustrates a calibration apparatus using a lookback in a wireless communication system.

Referring to FIG. 1, the apparatus includes an RFIC transceiver (receiver & transmitter) 150, a modem 100, a power amplifier (PA) 160, and a duplexer 170.

The modem 100 processes data based on a corresponding communication scheme as a modulation / demodulation device. For example, in the case of a code division multiple access (CDMA) communication method, a spreading code is used to spread a signal with a bandwidth much wider than a bandwidth of a signal to be transmitted. It is to divide data streams having a high data rate into a large number of data streams having a low data rate and transmit them simultaneously using a plurality of subcarriers. That is, in the case of Orthogonal Frequency-Division Multiplexing (OFDM) communication, Fast Fourier Transform (FFT) and Inverse Fast Fourier Tramsform (IFFT) operations are performed to simultaneously transmit data streams side by side in multiple sub-channels. To perform.

In particular, in addition to the present invention, the modem 100 controls the overall calibration operation. For example, a corresponding tone signal (1 tone or 2 tone) is generated and provided to the RFIC transceiver 150 according to a calibration item, and then gain gain calibration / DC-offset calibration / IQ mismatch calibration / IIP2 calibration algorithm. Measure, store or apply calibration values.

On the other hand, the modem 100 is a digital signal processor (DSP) 107 A / D converter 103, SPI 102, D / A converter 101, power meter 105 to control the overall calibration operation ), Tone generator 104, data storage / compare / selector 106.

The digital signal processor (DSP) 107 is a processor that processes digital signals and controls tone signal generation and correction values for calibration.

The tone generator 104 generates a tone signal under the control of the digital signal processor (DSP) 107 and provides it to the digital to analog (D / A) converter 101. The tone signal may be a sine file such as a sin function or a cosine function (hereinafter referred to as a training signal). Here, the tone signal is transmitted to both an I channel (or path) and a Q channel (or path) when performing a calibration operation using one tone, but an I channel (or path) when performing a calibration operation using two tones. Only one channel of the and Q channels (or paths).

The analog-to-digital (A / D) converter 103 converts an analog signal from the RFIC transceiver 150 into a digital signal and provides it to the power meter 105. The serial parallel interface (SPI) 102 provides an interface between the modem 100 and the RFIC transceiver 150 to record / store serial data in a register configured in parallel. The digital-to-analog converter 101 converts a digital signal into an analog signal and provides the digital signal to the RFIC transceiver 150. The power meter 105 analyzes the digital signal from the A / D 103 to measure the correction value, and provides the result to the data storage / compare / selector 106. The data store / compare / selector 106 stores the measurement results from the power meter 105 or provides correction values to the DSP 107 as needed.

The RFIC transceiver 150 converts a baseband signal into an RF signal to transmit the RF signal through an antenna (hereinafter referred to as a transmission path), or converts an RF signal received from the antenna into a baseband to convert the modem ( 100) (called the reception channel). In particular, in addition to the present invention, the RFIC transceiver 150 receives a tone signal or a training signal from the modem 100, and looks back the tone signal from the transmission path to the reception path (hereinafter, referred to as a loop back mode (loop back mode)). mode).

The transmission path includes a baseband programmable gain amplifier (PGA) 152, a transmission mixer 153, and a driver amplifier (DA) 154, and the reception path includes a low noise amplifier (LNA). 155, receiving mixer 156, and baseband PGA 157.

The baseband PGA 152 receives a baseband training signal through an I / Q channel, adjusts the gain by a separate input (usually a digital value), and provides it to the transmission mixer 153. The transmit mixer 153 up-converts the output signal from the baseband PGA 152 to the drive amplifier 154. In this case, the frequency that is up-converted is to apply the reception local oscillation (Rx LO) instead of the conventional transmission local oscillator (Tx LO) to use the frequency of the training signal input to the receiver as the receiver frequency. The driving amplifier 154 amplifies a predetermined level so that the power amplifier 160 amplifies the output signal from the transmission mixer 153.

Then, the training signal of the reception frequency (RxLO) generated through the transmission path is applied to the reception path in the form of leakage (leakage) through an external component such as an antenna switching or a filter in the duplexer 170. That is, the duplexer 170 divides the transmission / reception frequency and provides a received signal as a reception path (Rx path) or a signal from a transmission path (Tx path) as an antenna. In particular, in addition to the present invention, the duplexer 170 leaks the corresponding tone signal transmitted through the transmission path to the reception path.

When the above-described training signal is applied to the reception path, the low noise amplifier 155 suppresses and amplifies the noise of the training signal (or tone signal), and then outputs it to the reception mixer 156. The reception mixer 156 down-converts the training signal using a reception local oscillator (Rx LO) and outputs it to the baseband PGA 157. The baseband PGA 157 provides gain to the modem 100 by controlling a gain by a separate input (usually a digital value) for the output signal from the reception mixer 156.

Herein, the training signal transmitted to the modem 100 is calculated as a specific frequency component through an algorithm determined for each calibration item, and the process of finding a control register with a minimum value calculated by controlling the RFIC transceiver 150 is performed. Alternatively, a correction process such as finding a difference value according to a gain mode may be performed.

However, there is a constraint situation in which the absolute value of the power provided by the external device is not applied but all should be treated only with relative values. This is because the correct gain state cannot be determined because the reception frequency signal is applied through the transmission path, and the leakage power value for the external component is not constant. In addition, the non-linear nature of the transmission path distorts the training signal, resulting in constraints such as preconditions to compensate for some calibration items.

The reception calibration items can be classified into four types, and the conditions required in each case are shown in Table 1 below.

Calibration item Tonnage required Required frequency DC Offset Calibration 1 or 2 Don't care I / Q Mismatch Calibration One Don't care Gain Correction Calibration One Rx frequency IIP2 Calibration 2 Don't care

2 illustrates a calibration device using two tones in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, since the components of the apparatus are the same as those of FIG. 1, description of each component is omitted.

The DC offset and IIP2 calibration process requires two tones. For this purpose, the baseband training signal is artificially applied only to the I or Q path to generate two tones of image and original signal components. In order to approach the ideal case, applying the corrected transmit DC calibration value during the gain correction calibration and the I / Q mismatch calibration, two tones are generated with the carrier leakage signal removed.

That is, I / Q pre distortion transmits the training signal from the modem 100 to only one of the I / Q paths (I path or Q path). Here, it is assumed that the training signal has a Fa frequency component.

In this case, the baseband PGAs 202 and 203 adjust the gain of the baseband training signal according to a separate input (usually a digital value) and output the same to the mixers 204 and 205. . For example, when the baseband training signal is introduced only through the I path, the baseband training signal is output to the mixer 204. On the other hand, when the baseband training signal flows only into the Q path, the baseband training signal is output to the mixer 205.

The mixer 204 or the mixer 205 up-converts the training signal of the Fa frequency component using Fr + n * Fa frequency components and outputs the frequency to a driver amplifier (DA) 206. The driving amplifier 206 amplifies the up-converted training signal to a predetermined level in order to be amplified by the power amplifier 210. Here, the output signal of the mixer 204 or the mixer 205 using the Fr + n * Fa frequency component is a signal of the Fr + <n-1> Fa frequency component and the signal of the Fr + <n + 1> Fa frequency component. Is output. The signal of the Fr + <n-1> Fa frequency component is an image component and the signal of the Fr + <n + 1> Fa frequency component is an original signal component.

Thereafter, two tone signals (a signal having a frequency component of Fr + <n−1> Fa and a signal having a frequency component of Fr + <n + 1> Fa) are introduced into the receiver through the duplexer 220 (hereinafter referred to as a leakage signal).

A low noise amplifier (LNA) 207 suppresses and amplifies the noise of the leakage signal and outputs the result to the mixer 209. The mixer 209 down-converts the leakage signal using the frequency component Fr + (n + b) * Fa and outputs it to the baseband PGA 209.

The two tone signals generated using the I / Q mismatch are local oscillators (Fr + n * Fa) generated during the frequency upconversion process in the transmission paths 202-204-206-210 or 203-205-206-210. Since the real reception paths 207-208-209 are applied at a frequency spaced apart from the LO generated during the frequency up-conversion process at a predetermined interval, the two-tone calibration process can be performed.

The lookback mode itself, which eliminates the use of equipment, also reduces calibration time, but matching the environment controlled by the modem also helps save time. In other words, two tones may be generated in the lookback mode to simultaneously perform DC offset and IIP2 calibration.

3 illustrates a calibration device using one ton in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, since the components of the apparatus are the same as those of FIG. 1 or 2, the description of each component is omitted.

Looking at the I / Q mismatch calibration and the gain correction calibration process, first, I / Q pre-distortion transfers the training signal from the modem 100 to both I / Q paths. Here, it is assumed that the training signal has a Fa frequency component.

In this case, the corresponding baseband PGAs 302 and 303 respectively adjust the gain of the baseband training signal according to a separate input (usually a digital value) and output the same to the mixers 304 and 305. .

The mixer 304 and the mixer 305 up-convert the training signal of the Fa frequency component using Fr + n * Fa frequency components, and output the frequency to the driver amplifier DA 306. The driving amplifier 306 amplifies the up-converted training signal to a predetermined level in order to amplify the power amplifier 320. Here, the output signals of the mixer 304 and the mixer 305 using the Fr + n * Fa frequency components are the signals of the Fr + <n-1> Fa frequency components and the signals of the Fr + <n + 1> Fa frequency components. It is output (340). The signal of the Fr + <n-1> Fa frequency component is an image component and the signal of the Fr + <n + 1> Fa frequency component is an original signal component.

As shown in FIG. 3A, in the I / Q mismatch calibration and gain correction calibration process, image leakage due to carrier leakage and I / Q mismatch occurs in the reception path (350).

Therefore, image components due to carrier leakage and I / Q mismatch occurring in the reception path should be minimized. To this end, after removing the transmission nonlinearity through a method of a peak detector 306 that removes the nonlinear characteristics of the existing transmission path, a training signal of 1 ton is generated to generate a receiver through a leakage path. The calibration process is performed using the method used in the existing method.

That is, the peak detector 306 detects an envelope of a signal output to the mixers 304 and 305 and provides it to the baseband PGA 310.

Here, the envelope detection detects the Fr + <n-1> Fa frequency component, the Fr + n * Fa frequency component, and the Fr + <n + 1> Fa frequency component. Signal, the signal of Fr + n * Fa frequency components is removed, leaving only the Fr + <n + 1> Fa frequency components (360).

Meanwhile, one tone signal Fr + <n + 1> Fa frequency component signal is introduced into the receiver through the duplexer 330 (hereinafter referred to as a leakage signal). A low noise amplifier (LNA) 308 suppresses and amplifies the noise of the leakage signal and outputs the result to the mixer 309. The mixer 309 downconverts the leakage signal using the frequency component Fr + (n + b) * Fa and outputs the leakage signal to the baseband PGA 310. The baseband PGA 310 amplifies the signal from the mixer 309 using the envelope detection result.

Accordingly, as shown in FIG. 3B, after removing the nonlinear characteristics of the transmission path from the peak detector 307, the tone signal is provided through the leakage path, thereby minimizing image components due to carrier leakage and I / Q mismatch (370). ).

4 is a flowchart illustrating a calibration method in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the modem 100 selects a calibration item in step 400. That is, the modem 100 selects one of a gain correction calibration, a DC offset calibration, an I / Q mismatch calibration, and a 2nd Input Intercept Point (IIP2) calibration.

In step 420, the modem 100 determines whether the selected calibration item is a calibration using a one-tone signal or a calibration using a two-tone signal, and performs steps 404 and 406 when the calibration is performed using two tones. On the other hand, in the case of calibration using one ton, steps 410, 412, 414 and 416 are performed.

The DC offset calibration is a calibration method using 1 ton, and the I / Q mismatch calibration is a calibration method using 1 ton or a calibration method using 2 tones. The gain correction calibration and the IIP2 calibration are calibration methods using two tones.

The modem 100 provides the training signal to the RFIC transceiver 150 using only one path of the I path or the Q path in step 404.

In step 406, the RFIC transceiver 150 converts the training signal into two tone signals through a transmission path, and then sends the two tone signals to a receiving end. The modem 100 transmits the gain correction calibration to the receiver. Measure, store or apply the corrections required for the IIP2 calibration.

On the other hand, the modem 100 determines whether the transmission path calibration is performed in step 410, and when the transmission path calibration is performed, the modem 100 proceeds to step 412 and performs calibration using one tone. If the transmission path calibration is not performed, the process proceeds to step 414 where all of the training signals are input to the I / Q path.

In step 416, the RFIC transceiver 150 performs transmission path calibration through peak detection.

5 is a flowchart illustrating a hybrid gain calibration method in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the modem 100 selects a corresponding RF channel in step 500 and measures a gain mode in step 502.

Thereafter, in step 504, it is determined whether gain mode measurement is performed for all channels, and if the gain mode measurement is not performed for all channels, the process proceeds to step 500, and if gain mode measurement is performed for all channels, step 506. Proceed to

In step 506, the modem 100 determines the RSSI correction value using a reference gain value and a relative value for each gain mode. The reference gain value and the relative value for each gain mode are measured through an external device.

As described above, in the present invention, the gain correction calibration process proposes a hybrid correction method instead of a correction method using existing equipment. That is, conventionally, the absolute power value of the RF frequency component is received through an external device, and the value is recorded / corrected according to the channel and gain mode. However, the process of controlling and compensating for all combinations of two to three gain modes and two to three channels takes considerable time. In the present invention, the change in channel and mode is first recorded through lookback calibration, and only the reference mode and the reference channel are recorded through the external device. Use it as a result.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

100: modem, 150: RFIC transceiver, 160: power amplifier, 170 "duplexer.

Claims (14)

In the calibration device in a wireless communication system,
Select whether to perform calibration using one tone signal or calibration using two tone signals, and when performing calibration using two tone signals, select one of the I and Q channels to train only the selected channel. A modem that provides a signal to the transceiver,
The transceiver for frequency upconverting the training signal through a transmission path and transmitting the frequency to the duplexer;
The duplexer feeding back the frequency up-converted training signal from the transceiver to a reception path,
And the transceiver frequency downconverts the feedback training signal from the duplexer to provide the modem to the modem.
The method of claim 1,
When the modem performs calibration using one tone signal, the modem provides a training signal to both the I and Q channels to the transceiver.
The transceiver up-converts the training signal for each I channel and Q channel through a transmission path, detects an envelope of the frequency up-converted training signal, transmits it to the duplexer, and transmits a training signal fed back from the duplexer to a frequency. Down-converted to the modem,
And the duplexer feeds back the frequency up-converted training signal from the transceiver to a reception path.
The method of claim 1,
The modem,
Process a training signal received from the transceiver according to a calibration item;
Based on the result of the processing, the calibration device, characterized in that for calibrating the parameter value of the transceiver so that the minimum parameter value or to search for and store the difference value according to the gain mode.
The method of claim 1,
And the calibration using the one tone signal is one of a DC offset calibration, an I / Q imbalance calibration, and a gain correction calibration.
The method of claim 1,
And the calibration using the two tone signals is one of a DC offset calibration and a 2nd input intercept point (IIP2) calibration.
The method of claim 1,
The transceiver,
A baseband programmable gain amplifier (PGA) that receives a baseband training signal through the I / Q channel and adjusts gain by a separate input;
A transmission mixer for frequency upconverting an output signal from the baseband programmable gain amplifier (PGA) using a reception local oscillator (LO);
And a driver amplifier (DA) for a predetermined level amplification of the output signal from the transmission mixer so that a power amplifier (PA) can amplify.
The method of claim 1,
The transceiver,
A low noise amplifier for suppressing and amplifying noise of the leakage signal from the duplexer;
A reception mixer which down-converts the output signal from the low noise amplifier using a local oscillator (LO);
And a baseband programmable gain amplifier (PGA) for adjusting the gain according to a separate input for the output signal from the receiving mixer.
In the calibration method in a wireless communication system,
Selecting whether the modem performs calibration using one tone signal or calibration using two tone signals;
When the modem performs calibration using a two-tone signal, selecting one of an I channel and a Q channel, and providing a training signal to a transceiver only in a selected channel;
Transceiving, the transceiver to the frequency up-converted through the transmission path to the training signal to the duplexer,
The duplexer feeding back the frequency up-converted training signal from the transceiver to a reception path;
And by the transceiver, frequency downconverting the feedback training signal from the duplexer to provide the modem to the modem.
The method of claim 8,
Providing a training signal to both the I and Q channels to the transceiver when the modem performs calibration using one tone signal;
The transceiver for up-converting the training signal for each I channel and Q channel through a transmission path;
Transmitting, by the transceiver, the frequency upconverted training signal to the duplexer by detecting an envelope;
The duplexer feeding back the frequency up-converted training signal from the transceiver to a reception path;
And by the transceiver, frequency downconverting the training signal fed back from the duplexer and providing the training signal to the modem.
The method of claim 8,
The modem,
Processing a training signal received from the transceiver according to a calibration item;
And calibrating the parameter value of the transceiver so that the corresponding parameter value is minimum or searching for and storing a difference value according to a gain mode based on the processing result.
The method of claim 8,
And the calibration using the one tone signal is one of a DC offset calibration, an I / Q imbalance calibration, and a gain correction calibration.
The method of claim 8,
The calibration using the two tone signals is one of a DC offset calibration and a 2nd Input Intercept Point (IIP2) calibration.
The method of claim 8,
In the transceiver, the process of up-converting the training signal through a transmission path and transmitting the frequency to the duplexer,
Receiving a baseband training signal through a baseband programmable gain amplifier (PGA) through the I / Q channel, and adjusting gain by a separate input;
A step of the transmit mixer performing frequency upconversion of the output signal from the baseband PGA using a receiving local oscillator (LO);
And a step of amplifying the output signal from the transmission mixer so that a driver amplifier (DA) can amplify the power amplifier (PA).
The method of claim 8,
The transceiver, the frequency down-converted training signal fed back from the duplexer to provide to the modem,
A low noise amplifier suppresses and amplifies the noise of the leakage signal from the duplexer;
A reception mixer downconverts the output signal from the low noise amplifier using a local oscillator (LO);
And a baseband programmable gain amplifier (PGA) for adjusting the gain of the output signal from the receiving mixer according to a separate input.

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