CN108123764B - Mirror image calibration device and method with link self-adaption - Google Patents
Mirror image calibration device and method with link self-adaption Download PDFInfo
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- CN108123764B CN108123764B CN201711437283.6A CN201711437283A CN108123764B CN 108123764 B CN108123764 B CN 108123764B CN 201711437283 A CN201711437283 A CN 201711437283A CN 108123764 B CN108123764 B CN 108123764B
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/13—Monitoring; Testing of transmitters for calibration of power amplifiers, e.g. gain or non-linearity
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- Engineering & Computer Science (AREA)
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- Nonlinear Science (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
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Abstract
The invention provides a mirror image calibration device with link adaptation, comprising: the system comprises a micro control unit MCU, a signal generation unit, a gain adjustment unit, a link to be calibrated, a mirror image calibration module and a power detection unit; the micro control unit MCU is connected with the signal generating unit, the gain adjusting unit, the mirror image calibration module and the power detection unit respectively. The invention also provides an image calibration method with link adaptation, which makes the existing image calibration method have more universal applicability, and can automatically adjust the link to the optimal state suitable for image calibration for links with different rated gains and links with gain change caused by temperature characteristics or frequency characteristics. The invention can obviously improve the adaptability and portability of the mirror image calibration function, improve the integration degree and accelerate the development period.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a device and a method for calibrating a mirror image with link adaptation.
Background
The zero intermediate frequency transceiver directly modulates or demodulates the baseband signal without intermediate frequency, which is beneficial to miniaturization and low cost of the system; on the other hand, the number of circuit modules and external nodes required by the system is reduced, so that the power consumption required by a transceiver is reduced and the opportunity that a radio frequency signal is interfered by the outside is reduced; zero intermediate frequency transceivers are widely used.
Due to the unique architecture of the zero intermediate frequency transceiver, the degradation of the quality of the main signal and the influence on the system index caused by local oscillation leakage and unbalanced phase and amplitude of I-path and Q-path data are found in the application process. To solve these problems, there are a number of zero intermediate frequency transceiver image rejection schemes that are currently available and have good results. However, in large-scale application, the frequency characteristic and the temperature characteristic of the radio frequency device cause the link gain difference, which can cause the problems of unsatisfied dynamic range of power detection, overflow of the received power of the device, and the like, and finally affect the quadrature adjustment calibration effect, the signal quality and the system index. Also for different design applications, it is often necessary to recalibrate the link's optimal calibration gain, which cannot be quickly transplanted, increasing human effort.
Disclosure of Invention
In order to solve the above problems, the present invention discloses an image calibration device and method with link adaptation, which makes the existing image calibration method have more general applicability, and can automatically adjust the link to the best state suitable for image calibration for links with different rated gains and links with gain changes due to temperature characteristics or frequency characteristics. The invention can obviously improve the adaptability and portability of the mirror image calibration function, improve the integration degree and accelerate the development period.
In order to achieve the above purpose, the technical scheme of the invention is specifically realized as follows:
an image calibration device with link adaptation, comprising: the system comprises a micro control unit MCU, a signal generation unit, a gain adjustment unit, a link to be calibrated, a mirror image calibration module and a power detection unit; the micro control unit MCU is connected with the signal generating unit, the gain adjusting unit, the mirror image calibration module and the power detection unit respectively.
The signal generation unit is used for sending out a calibration signal;
the gain adjusting unit is controlled by the MCU and can adjust the power of the calibration signal;
the link to be calibrated is a link which needs mirror image calibration in application;
the mirror image calibration module is an existing mirror image calibration module in application;
the power detection unit is used for detecting the power of the calibration signal after passing through the gain adjustment unit and the link to be calibrated;
and the MCU controls the modules to coordinate to realize the pre-calibration and final mirror image calibration functions of the link.
The invention also provides a mirror image calibration method with link self-adaption, which comprises the following steps:
step S01: the MCU controls the signal generating unit to send out a calibration signal;
step S02: the gain of the gain adjusting unit is preset to be a default value, and the default value is a minimum gain value in an adjustable range;
step S03: closing the mirror calibration module even if the mirror calibration module is not functional;
step S04: adjusting the local oscillation frequency of a link to be calibrated, so that the local oscillation frequency is consistent with the local oscillation frequency when the link to be calibrated loads a main signal;
step S05: the micro control unit MCU adjusts the gain of the gain adjusting unit to enable the power detected by the power detecting unit to reach the preset optimal power;
step S06: the preset optimal power refers to the power when the gain of the gain adjusting unit is as large as possible under the condition that the normal operation of the mirror image calibration module is met;
step S07: the normal working condition of the mirror image calibration module means that signal power cannot cause the receiving or transmitting power overflow of a mirror image calibration related device in the calibration process, so that the mirror image calibration related device is in an abnormal working state;
step S08: and starting a mirror image calibration module to start calibration.
Compared with the traditional mirror image calibration scheme, the invention has more universal adaptability, and can especially solve the influence caused by various different frequency characteristics, temperature characteristics and the like when the equipment operates, and the problems that debugging and production are possibly not considered are covered. Meanwhile, due to the more general adaptability, the mirror image calibration function is more integrated, and the mirror image calibration method is convenient for transplanting application in different applications.
Drawings
FIG. 1 is a schematic diagram of a mirror image calibration device of the present invention;
FIG. 2 is a mirror calibration flow chart of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and examples.
FIG. 1 is a schematic diagram of a mirror calibration device with link adaptation according to the present invention.
As shown in FIG. 1, the device mainly comprises a signal generation unit, a gain adjustment unit, a link to be calibrated, a power detection unit, a micro control unit MCU and a mirror image calibration module. The micro control unit MCU is connected with the signal generating unit, the gain adjusting unit, the mirror image calibration module and the power detection unit respectively.
The device of fig. 1 is operated in a manner that includes both a link pre-calibration and a mirror calibration procedure. The following description will be given respectively.
The link pre-calibration process comprises the following steps:
step S01, a signal generating unit sends out a calibration signal; the signal is used as a reference signal in a link pre-calibration stage and is used for calibrating the link gain, and can be a single-tone signal, a carrier signal or a specific training sequence signal;
step S02, presetting gain of a gain adjusting unit; here the link gain is set to a small value as the starting point for the adjustment;
s03, closing a mirror image calibration module; at the moment, the mirror image calibration module is in an inactive state so as not to influence the link pre-calibration flow;
step S04, adjusting the frequency of a local oscillation signal of a link to be calibrated; the local oscillation frequency is consistent with the local oscillation frequency when the link to be calibrated loads the main signal, so that the characteristics of the link are consistent with the normal operation;
step S05, detecting power by a power detection unit; detecting the power of the calibration signal sent by the signal generating unit after passing through the link;
step S06, judging whether the power detected by the power detection unit reaches a preset optimal value;
step S07, adjusting the gain, and adjusting the gain to change the detected power value until the power reaches a preset optimal value; the optimal value means that the link gain is at a proper value, so that the signal power can not cause the receiving or transmitting power overflow of the image calibration related device in the calibration process of the image calibration module, thereby being in an abnormal working state;
step S08: and starting a mirror image calibration module to start calibration.
The mirror image calibration flow is to start the mirror image calibration function to finish calibration in the state of the link gain regulated by the pre-calibration flow.
The invention is suitable for various existing mirror image calibration schemes, has more universal adaptability by applying the improved mirror image calibration scheme, and can especially solve the influence caused by various different frequency characteristics, temperature characteristics and the like when the equipment operates, and the problems of debugging and production which are possibly not considered are covered. Meanwhile, due to the more general adaptability, the mirror image calibration function is more integrated, and the mirror image calibration method is convenient for transplanting application in different applications.
The foregoing is merely illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit of the present invention should be included in the scope of the claims of the present invention.
Claims (2)
1. A mirrored calibration apparatus with link adaptation, comprising: the system comprises a micro control unit MCU, a signal generation unit, a gain adjustment unit, a link to be calibrated, a mirror image calibration module and a power detection unit; the micro control unit MCU is connected with the signal generation unit, the gain adjustment unit, the mirror image calibration module and the power detection unit respectively;
the signal generation unit is used for sending out a calibration signal; the gain adjusting unit is controlled by the MCU and can adjust the power of the calibration signal; the link to be calibrated is a link which needs mirror image calibration in application; the power detection unit is used for detecting the power of the calibration signal after passing through the gain adjustment unit and the link to be calibrated; the MCU controls the modules to coordinate to realize the pre-calibration and final mirror calibration functions of the link;
the link pre-calibration process includes: the MCU controls the signal generating unit to send out a calibration signal; the gain of the gain adjusting unit is preset to be a default value, and the default value is a minimum gain value in an adjustable range; closing the mirror calibration module even if the mirror calibration module is not functional; adjusting the local oscillation signal frequency of a link to be calibrated, so that the local oscillation signal frequency is consistent with the local oscillation frequency when the link to be calibrated loads a main signal; the micro control unit MCU adjusts the gain of the gain adjusting unit to enable the power detected by the power detecting unit to reach the preset optimal power; the preset optimal power refers to the power when the gain of the gain adjusting unit is as large as possible under the condition that the normal operation of the mirror image calibration module is met; the normal working condition of the mirror image calibration module means that signal power cannot cause the receiving or transmitting power overflow of a mirror image calibration related device in the calibration process, so that the mirror image calibration related device is in an abnormal working state; starting a mirror image calibration module to start calibration;
the mirror image calibration flow is to start the mirror image calibration function to finish calibration in a state of the link gain regulated by the pre-calibration flow.
2. A method of image calibration with link adaptation, the method comprising the steps of:
step S01: the MCU controls the signal generating unit to send out a calibration signal;
step S02: the gain of the gain adjusting unit is preset to be a default value, and the default value is a minimum gain value in an adjustable range;
step S03: closing the mirror calibration module even if the mirror calibration module is not functional;
step S04: adjusting the local oscillation signal frequency of a link to be calibrated, so that the local oscillation signal frequency is consistent with the local oscillation frequency when the link to be calibrated loads a main signal;
step S05: the micro control unit MCU adjusts the gain of the gain adjusting unit to enable the power detected by the power detecting unit to reach the preset optimal power; the preset optimal power refers to the power when the gain of the gain adjusting unit is as large as possible under the condition that the normal work of the mirror image calibration module is met; the normal working condition of the mirror image calibration module means that signal power cannot cause the receiving or transmitting power overflow of a mirror image calibration related device in the calibration process, so that the mirror image calibration related device is in an abnormal working state;
step S06: and starting a mirror image calibration module to start calibration.
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| CN201711437283.6A CN108123764B (en) | 2017-12-26 | 2017-12-26 | Mirror image calibration device and method with link self-adaption |
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| CN201711437283.6A CN108123764B (en) | 2017-12-26 | 2017-12-26 | Mirror image calibration device and method with link self-adaption |
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