WO2009139263A1 - Procédé de calibrage et dispositif de communication - Google Patents

Procédé de calibrage et dispositif de communication Download PDF

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Publication number
WO2009139263A1
WO2009139263A1 PCT/JP2009/057666 JP2009057666W WO2009139263A1 WO 2009139263 A1 WO2009139263 A1 WO 2009139263A1 JP 2009057666 W JP2009057666 W JP 2009057666W WO 2009139263 A1 WO2009139263 A1 WO 2009139263A1
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Prior art keywords
calibration
test signal
correction coefficient
wireless device
reception quality
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PCT/JP2009/057666
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English (en)
Japanese (ja)
Inventor
康義 能田
嘉孝 原
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三菱電機株式会社
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Priority to JP2010511933A priority Critical patent/JP4651750B2/ja
Publication of WO2009139263A1 publication Critical patent/WO2009139263A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements

Definitions

  • the present invention relates to a calibration method for performing calibration between a plurality of antennas in wireless communication with high efficiency and a communication apparatus for realizing the calibration method.
  • the TDD (Time Division Duplex) method that alternately uses the same frequency in the uplink and the downlink is expected to have an advantage that the channel reversibility can be used in forming the transmission beam.
  • channel information is required at the transmitter (transmitter-side radio).
  • channel measurement is performed using a pilot signal from the receiver (receiver-side radio device) to the transmitter, thereby easily receiving from the transmitter. The channel status to the machine can be grasped.
  • the radio equipment measures the propagation path in the digital domain, but in order to use reversibility, it compensates for the analog characteristic difference between the transmitter and the receiver (transmission / reception system analog characteristic difference). Calibration that maintains the reversibility of the image is usually required.
  • a radio having a plurality of antennas transmits / receives test signals to / from other radios, so that a plurality of antennas can be obtained. Compensates for the difference in analog characteristics between the transmitting and receiving systems.
  • the self-calibration described in Patent Document 1 and Non-Patent Document 1 has an advantage that a test signal with weak transmission power is exchanged between a plurality of antennas in a wireless device, so that a control signal is unnecessary in a wireless system.
  • the test signal transmission power is much lower than the transmission power during communication, the analog characteristics of the amplifier change between the test signal transmission and the communication signal transmission when the transmitter amplifier of the radio is power dependent. There is a case. In this case, even if self-calibration is performed using a test signal, phase matching between antennas cannot be sufficiently maintained during communication.
  • the self-calibration has a problem of power dependency of the signal amplifier, while the calibration performed through another radio device has a problem of increasing the amount of control signal.
  • the accuracy of the correction coefficient obtained by each of the above methods varies depending on the reception quality (SNR and SINR) of the test signal. It is desirable to exchange test signals in an environment where the influence of noise and interference is small. However, in actuality, there are cases where the transmitted signal is weak in self-calibration, and in the calibration performed via other radios, antennas are used. Due to the wide distance, the correction coefficient is not always obtained with sufficient reception quality, and there is a problem that a test signal that is long in time must be used to ensure calibration accuracy.
  • the present invention has been made in view of the above, and realizes a calibration method for efficiently compensating for an analog characteristic difference between antennas by solving the problem of power dependency and control signal amount.
  • An object of the present invention is to obtain a communication device that performs the above.
  • the present invention is a calibration method in a case where a radio apparatus having a plurality of antennas that perform communication by the TDD method calibrates each antenna, A first calibration step for calculating a first correction coefficient by performing antenna calibration by the radio alone, and a second correction coefficient by performing antenna calibration using communication with other radios A second calibration step to be calculated; and a correction coefficient selection step of selecting one of the first correction coefficient and the second correction coefficient depending on the situation to obtain a final correction coefficient. It is characterized by that.
  • FIG. 1 is a diagram illustrating the concept of Method A (self-calibration).
  • FIG. 2 is a diagram illustrating the concept of Method B (calibration performed via another wireless device).
  • FIG. 3 is a diagram showing the concept of the calibration method of the present embodiment.
  • FIG. 4 is a flowchart illustrating an example of a control procedure of the calibration method according to the present embodiment.
  • FIG. 5 is a diagram illustrating a signal correction operation during signal transmission.
  • FIG. 6 is a diagram illustrating a control signal transmission / reception operation between the wireless device and the base station in the calibration by the method B.
  • FIG. 7 is a diagram illustrating a configuration example of a wireless device that realizes the calibration method according to the second embodiment.
  • FIG. 8 is a diagram illustrating an operation procedure of the method B used in the calibration method according to the third embodiment.
  • FIG. 9 is a diagram illustrating an operation procedure of the method B used in the calibration method according to the third embodiment.
  • FIG. 10 is a diagram illustrating an operation procedure of method B used in the calibration method of the third embodiment.
  • FIG. 1 is a conceptual diagram of calibration of Method A.
  • the wireless device 1 transmits / receives a test signal between two antennas, and calculates an analog characteristic difference between the antennas from the result.
  • FIG. 1 shows the case where the number of antennas is 2.
  • FIG. 2 is a conceptual diagram of the calibration of the method B.
  • the wireless device 1 transmits / receives a test signal between each antenna and another wireless device (for example, the base station 2), and calculates an analog characteristic difference between the antennas from the result.
  • component transmission processing unit T BS is attached (transmitter), the components R BS is attached is a reception processing unit (receiver).
  • the method A used in the present embodiment may be any conventional self-calibration method.
  • the method B used in the present embodiment is the conventional method performed through another wireless device. Any calibration method may be used.
  • FIG. 3 is a diagram showing the concept of the calibration method of the present embodiment. As shown in the figure, this embodiment is characterized in that calibration is performed by selectively or adaptively using the method A and the method B depending on the situation.
  • FIG. 4 is a flowchart showing an example of the control procedure of the calibration method of the present embodiment.
  • the wireless device (communication device) 1 first calculates the correction coefficient u A by the method A (see FIG. 1) and the method B (see FIG. 2), the correction coefficient u B is calculated (step S1).
  • the wireless device 1 compares the two calculated correction coefficients u A and u B and confirms whether they are similar (step S2).
  • step S2 If the two correction coefficients are similar (step S2, Yes), it is determined that the influence of the power dependency of the transmission amplifier in the method A is small and the method A can be applied, and the correction coefficient u A calculated by the method A is determined. Is adopted (step S3). A method for determining whether the correction coefficients are similar will be described later. Further, in order to compensate for the temperature change, the correction coefficient is calculated by the method A when a certain time has elapsed, and the correction coefficient u A is updated (step S4). Further, it is confirmed whether or not it is necessary to reselect the correction coefficient calculation method (step S5). If reselection is necessary (step S5, Yes), the process proceeds to step S1.
  • step S5 if there is no need for reselection (step S5, No), the correction coefficient is calculated by the method A when a fixed time has passed and the correction coefficient u A is updated (step S4). Thereafter, the processes in steps S4 and S5 are repeated until it is determined in step S5 that the correction coefficient calculation method needs to be selected again.
  • step S2 when the two correction coefficients are not similar but greatly different (step S2, No), it is determined that the influence of the power dependency of the transmission amplifier in the method A is large and the method A is not applicable. Then, the correction coefficient u B calculated by the method B is employed (step S6). Further, in order to compensate for the temperature change, the correction coefficient is calculated by the method B when a certain time has elapsed, and the correction coefficient u B is updated (step S7). Further, it is confirmed whether or not it is necessary to reselect the correction coefficient calculation method (step S8). If reselection is necessary (step S8, Yes), the process proceeds to step S1.
  • step S8 if there is no need for reselection (step S8, No), the correction coefficient is calculated by the method B when a certain time has passed and the correction coefficient u B is updated (step S7). Thereafter, the processes in steps S7 and S8 are repeated until it is determined in step S8 that the correction coefficient calculation method needs to be reselected.
  • the correction coefficient is a value that is individually set for each antenna in order to compensate for a transmission / reception system analog characteristic difference.
  • the first antenna (antenna # 1) is normally used as a reference, and the correction coefficient is set to 1 for the reference antenna.
  • the other antenna (antenna #m) corrects the transmission signal or the reception signal using the correction coefficient so that the same transmission / reception analog characteristics as the reference antenna are obtained.
  • the calibration between the two antennas is assumed, and the correction coefficients at the second antenna (antenna #m) are shown as u A and u B. This is just an example, and the same concept can be applied to the case of three or more antennas.
  • the method A with a small amount of control signal is used when the problem of the power dependency of the amplifier is small in the method A, and the power dependency when the influence of the power dependency is large.
  • Method B that is not affected by the above is used.
  • the method A and the method B are properly used depending on the situation.
  • the conventional method using only the method A has a problem of power dependency of the amplifier.
  • the method A is used only when the power dependency of the amplifier does not matter. There is no power dependency problem.
  • the amount of control signal can be suppressed by appropriately using method A in the present embodiment.
  • the analog characteristics of the transmission / reception system usually change over time. Therefore, as described above, the calibration is repeatedly executed to follow the characteristic variation. In particular, the analog characteristics are likely to change according to the temperature change, but can usually be regarded as constant for about 1 minute. Accordingly, in steps S4 and S7, the selected method (method A in step S4, method B in step S7) is repeatedly executed, for example, in a time period of about 1 minute, and the correction coefficient is updated.
  • the process of steps S1 and S2 that is, the process of selecting the method to be applied is a period (for example, 1 hour period, 1 day period, etc.) sufficiently longer than the period of updating the correction coefficient in steps S4 and S7. Execute.
  • steps S5 and S8 it is confirmed whether or not a predetermined period (one hour period, one day period, etc. sufficiently longer than 1 minute) has elapsed after the method selection is performed, and the transition destination is determined according to the confirmation result.
  • a predetermined period one hour period, one day period, etc. sufficiently longer than 1 minute
  • the process of selecting the method to be applied may be performed when the radio power has moved and the transmission power used for communication has changed greatly, instead of determining the elapsed time since the process was executed.
  • determination based on elapsed time and determination based on transmission power may be used in combination.
  • the wireless device 1 when the wireless device 1 having a plurality of antennas performs calibration with the base station 2, the wireless device 1 first transmits a request signal for requesting the calibration by the method B to the base station 2, and the base station 2 transmits the wireless device.
  • the request signal from 1 is received
  • calibration by the method B is executed between the wireless device 1 and the base station 2.
  • the wireless device 1 also performs calibration by the method A independently. Thereafter, the wireless device 1 compares the two correction coefficients obtained by the method A and the method B, and selects one of them (corresponding to the processing in steps S1 and S2 in FIG. 4).
  • the calibration control that requests the base station 2 to stop the calibration control Send a stop signal.
  • the base station 2 receives the calibration control stop signal
  • the base station 2 stops the calibration by the method B, and thereafter, the radio device 1 performs the calibration by the method A at regular intervals.
  • the radio device 1 controls the base station 2 to perform calibration control.
  • a calibration control continuation signal for requesting continuation of is transmitted.
  • the base station 2 receives the calibration control continuation signal
  • the base station 2 continues the calibration by the method B, so that the test signal is exchanged with the wireless device 1 at a specific cycle, and the calibration by the method B is executed.
  • the wireless device 1 notifies the base station 2 of a calibration control stop signal or continuation signal according to the selection of the method A and the method B.
  • the control of the base station 2 and the wireless device 1 is shown here as an example, the above-described control may be performed between any two wireless devices.
  • step S2 a method for determining whether the correction coefficients u A and u B are similar or greatly different in step S2 described above will be described below.
  • Various methods can be used as this determination method. For example, the determination can be made using the following equation (1).
  • T is a threshold value.
  • u A and u B are complex numbers, but if the ratio is close to 1, the correction coefficients u A and u B can be regarded as similar. Therefore, if the equation (1) is satisfied, it is determined that the correction coefficients are similar, and the control shown in steps S3 to S5 is executed. If the equation (1) is not satisfied, the control shown in steps S6 to S8 is executed.
  • a method of determining the similarity between the correction coefficients u A and u B based on various criteria can be considered.
  • the calibration method of Method B which requires a control signal for transmitting and receiving test signals to and from other wireless devices and is complicated, is used depending on the situation.
  • the self-calibration (method A) that is easy to process is adopted, and when there is power dependency and sufficient correction performance cannot be obtained by method A, the processing is
  • the calibration (method B) which is complicated but does not degrade the correction accuracy due to the influence of power dependency, is performed using communication with other wireless devices (method B).
  • a calibration method that efficiently compensates for the difference in analog characteristics between antennas can be obtained.
  • the antenna calibration assuming two antennas has been described.
  • the correction coefficient vector U A [1, u A (2), u A (3), ..., u A (N)] T
  • U B [1, u B (2), u B (3), ..., u B (N)] T
  • equivalent control is applied.
  • the similarity between the vectors U A and U B can be determined by the following equation (2), for example.
  • the value of the left side of the above equation (2) increases when the directions of the vectors U A and U B are close. Therefore, when the left side of Equation 2 is larger than a certain threshold value V, the vectors U A and U B can be regarded as similar states.
  • the calibration method of the present embodiment can be applied to the case of performing calibration with three or more antennas.
  • Embodiment 2 the calibration method according to the second embodiment will be described.
  • the calibration method described in the first embodiment has been described assuming that any method may be used without particularly mentioning the method A (self-calibration) to be used.
  • An example of Method A will be described. Specifically, a calibration method is described in which the reception quality of the test signal to be used is predicted, and the method A is performed while changing the length of the test signal according to the prediction result.
  • FIG. 7 is a diagram illustrating a configuration example of a radio that realizes the calibration method according to the second embodiment.
  • reception quality prediction is performed and the length of a test signal used for calibration is controlled.
  • wireless machine 1a to perform is shown.
  • the wireless device 1a includes a transmission / reception control unit 11 that performs signal transmission / reception processing, a power measurement unit 12 that measures the power of a reception signal, a reception quality prediction unit 13 that predicts reception quality of a test signal, and a test signal to be transmitted.
  • a test signal sequence length determination unit 14 that determines the length of the signal, and a parameter control unit 15 that sets various parameters when executing the calibration operation.
  • the power measurement unit 12 collects power measurement data necessary for the reception quality prediction unit 13 in the subsequent stage to predict reception quality. For example, the power measurement unit 12 measures noise power (including interference power) in a silent section and calculates the magnitude of noise power.
  • the reception quality prediction unit 13 next predicts reception quality such as SNR and SINR using the power measurement data.
  • the reception quality prediction operation in addition to the noise power data calculated by the power measurement unit 12, the power level of the signal scheduled to be transmitted, and the literature “Noda, Hara, Yano, Kubo,“ bidirectional channel measurement in the TDD system are used.
  • the radio 1a is equipped with an attenuator (attenuator) described in "Antenna array self-calibration used", IEICE Technical Report RCS2008-12, May 2008, the amount of attenuation ( The reception quality is predicted using the attenuation rate.
  • the attenuation amount utilized is hold
  • the received signal power can be estimated from, for example, a value obtained by subtracting the propagation loss between the plurality of antennas of the radio station 1a and the attenuation amount of the attenuator from the planned transmission power (power of the signal scheduled to be transmitted),
  • the SNR can be predicted from this and the noise power measurement result described above.
  • This prediction result is sent to the test signal sequence length determination unit 14, and the test signal sequence length determination unit 14 uses it in calibration based on the reception quality prediction result (for example, SNR) received from the reception quality prediction unit 13.
  • the reception quality prediction result for example, SNR
  • For the number of symbols for example, a comparison table of the SNR and the required number of symbols is created and held in advance, and the number of symbols is determined by comparing this comparison table with the SNR received from the reception quality prediction unit 13.
  • the determined number of symbols is held in the parameter control unit 15, and the test signal having the number of held symbols is used during calibration.
  • the reception quality is predicted for each combination of the reference antenna and each antenna to be calibrated, and the test signal length (number of symbols) is determined for each combination. If you want to avoid complication of control, predict the reception quality and determine the test signal length for any one combination, and fix the test signal of the determined length in all combinations. It may be used.
  • the radio that performs calibration predicts the reception quality of the test signal, and performs the calibration process using the test signal having a length corresponding to the prediction result. .
  • the reception SNR of the test signal at the time of calibration is poor, the number of symbols of the test signal is correspondingly increased and the calibration process is performed, so that necessary accuracy can be ensured.
  • a sufficient reception SNR can be obtained, it is possible to obtain an effect such as suppressing transmission of an unnecessary number of symbols and shortening a communication disconnection time that occurs when the calibration process is performed.
  • the accuracy of the necessary correction coefficient is changed depending on the modulation method used at the time of data communication after calibration. For example, even in a system that uses a modulation scheme that requires a small calibration distance and a higher calibration accuracy, and a system that uses adaptive modulation, the accuracy is controlled by the modulation scheme and the predicted reception quality, It is possible to prevent a decrease in communication efficiency due to calibration accuracy.
  • the case where a method of predicting using the power measurement result of the silent section is applied as a method of predicting the reception quality has been described.
  • a system that performs calibration periodically In the method of using the received power at the time of the previous calibration, the method of using the received power at the time of the most recent data communication, and receiving the received power and SNR from the wireless station that is the communication partner, and using it Method (for example, if communication is performed between the same model, the transmission power is known, and the propagation path reversibility between antennas is established, the reception power, noise power, SNR, etc.
  • the reception quality of the station can be estimated), and the reception quality may be predicted by combining these.
  • Embodiment 3 the calibration method according to the third embodiment will be described.
  • the test signal is used in the method B (calibration performed through another wireless device). A case where the length of the test signal to be made is variable will be described.
  • FIGS. 8 to 10 are diagrams showing an operation procedure of the method B used in the calibration method of the third embodiment.
  • a radio method A having a plurality of antennas is shown.
  • FIG. 4 shows an operation procedure in the case where the radio apparatus) also executes the method B while regarding the base station as another radio apparatus.
  • FIG. 8 shows a procedure when the reception quality prediction of the test signal and the determination of the test signal length are performed on the wireless device side, and FIG. 9 performs the reception quality prediction of the test signal on the wireless device side to determine the test signal length.
  • FIG. 10 shows the procedure when the reception quality prediction of the test signal and the determination of the test signal length are performed on the base station side. In FIG. 8 to FIG. 10, the same step number is assigned to the same process.
  • the wireless device performs reception power measurement (step S11), then performs reception quality estimation based on this result (step S12), and further, a test signal based on the reception quality estimation result.
  • a sequence length is determined (step S13). Note that the processing executed in each of these steps is the same as the processing executed by the power measurement unit 12, the reception quality prediction unit 13, and the test signal sequence length determination unit 14 described in the second embodiment.
  • a signal designating the determined sequence length is transmitted to the base station (step S14), and the base station transmits a test signal having a length determined by the wireless device to the wireless device (step S15). Further, the radio transmits a test signal having a length determined in step S13 to the base station (step S16).
  • the base station feeds back the measurement result of the test signal transmitted from the radio device to the radio device (step S17), and the radio device returns the measurement result fed back and the test signal transmitted from the base station in step S15.
  • the correction coefficient is calculated based on the reception result (step S18).
  • the calibration performed with the test signal having a length corresponding to the reception quality is realized in the same manner as the calibration shown in the second embodiment. Even when the SNR at the time of reception is small, the test signal can be transmitted and received with the corresponding sequence length, and calibration can be performed with the required accuracy.
  • the radio notifies the base station of the reception quality (reception quality estimation result) obtained by executing step S12 (step S21). Based on the notified reception quality, the base station determines the length of the test signal (test signal sequence length) (step S22). In this step S22, the base station determines the test signal sequence length in the same procedure as the test signal sequence length determination unit 14 shown in Embodiment 2 determines the test signal sequence length. After the base station determines the test signal sequence length, steps S15 to S18 already described are executed.
  • the radio device performs a test such as having the base station notify the sequence length of the test signal to be received in advance, or defining the unique sequence included in the signal as the start and end points of the test signal. Operates by detecting the length of the signal.
  • the radio side estimates the reception quality from the reception power measurement result and notifies the base station of the obtained reception quality estimation result.
  • the result may be transmitted to the base station as it is, and the base station may execute step S22 after estimating the reception quality based on the notified reception power measurement result.
  • the base station executes the same process as in step S11 above to measure the received power (step S31), and further executes the same process as in step S12 above to receive the reception quality. Is estimated (step S32). And a base station performs step S22 already demonstrated using the reception quality estimation result obtained by performing step S32. Thereafter, steps S15 to S18 are executed in the same manner as the procedure shown in FIGS.
  • the radio instructs the base station to start the calibration process of method B after determining the test signal sequence length.
  • the base station may autonomously determine the test signal sequence length and notify the radio device that the calibration process of method B is started, and then execute the above procedure.
  • the radio apparatus notifies the base station of the sequence length of the test signal to be received in advance, or the unique sequence included in the signal is the starting point of the test signal. And, it operates by detecting the length of the test signal by a method such as prescribing as termination.
  • the base station and the radio antenna are reversible communication paths, and the noise level (noise power) and transmission power on the radio side are known on the base station side by some method, the base station measures the received power. Since the reception quality result of the radio can be predicted from the result, the procedure shown in FIG. 10 can be adopted.
  • the calibration method according to the present invention is useful for wireless communication using a plurality of antennas, particularly when the wireless device efficiently compensates for a difference in transmission / reception system analog characteristics between antennas. Is suitable.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
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Abstract

Cette invention concerne un procédé de calibrage permettant à un dispositif sans fil qui possède une pluralité d’antennes et qui réalise une communication TTD, de calibrer ses antennes respectives. Ledit procédé comprend : une première étape de calibrage consistant à calculer un premier coefficient de correction grâce à un calibrage d’antenne effectué seulement par cet unique dispositif sans fil ; une seconde étape de calibrage consistant à calculer un second coefficient de correction grâce à un calibrage d’antenne basé sur la communication avec un autre dispositif sans fil ; et une étape de sélection de coefficient de correction consistant à sélectionner le premier ou le second coefficient de correction en fonction de la situation, et à faire du coefficient sélectionné un coefficient de correction final.
PCT/JP2009/057666 2008-05-16 2009-04-16 Procédé de calibrage et dispositif de communication WO2009139263A1 (fr)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
JP2017507611A (ja) * 2014-03-04 2017-03-16 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ アナログ組み込み式自己テストトランシーバ
KR20200034251A (ko) * 2018-09-21 2020-03-31 주식회사 이노와이어리스 매시브 ｍｉｍｏ용 채널 시뮬레이터의 ｉ／ｑ 임밸런스 캘리브레이션 방법

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JP2003218621A (ja) * 2002-01-21 2003-07-31 Nec Corp アレーアンテナの校正装置及び校正方法
JP2003229797A (ja) * 2002-01-31 2003-08-15 Matsushita Electric Ind Co Ltd アレーアンテナ送信装置および特性誤差校正方法
JP2005328571A (ja) * 2005-07-25 2005-11-24 Sanyo Electric Co Ltd 無線端末装置、送信指向性キャリブレーション方法、および送信指向性キャリブレーションプログラム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003218621A (ja) * 2002-01-21 2003-07-31 Nec Corp アレーアンテナの校正装置及び校正方法
JP2003229797A (ja) * 2002-01-31 2003-08-15 Matsushita Electric Ind Co Ltd アレーアンテナ送信装置および特性誤差校正方法
JP2005328571A (ja) * 2005-07-25 2005-11-24 Sanyo Electric Co Ltd 無線端末装置、送信指向性キャリブレーション方法、および送信指向性キャリブレーションプログラム

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017507611A (ja) * 2014-03-04 2017-03-16 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ アナログ組み込み式自己テストトランシーバ
KR20200034251A (ko) * 2018-09-21 2020-03-31 주식회사 이노와이어리스 매시브 ｍｉｍｏ용 채널 시뮬레이터의 ｉ／ｑ 임밸런스 캘리브레이션 방법
KR102129270B1 (ko) 2018-09-21 2020-07-02 주식회사 이노와이어리스 매시브 ｍｉｍｏ용 채널 시뮬레이터의 ｉ／ｑ 임밸런스 캘리브레이션 방법

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