CN114826845B

CN114826845B - IQ imbalance estimation method and device and related equipment

Info

Publication number: CN114826845B
Application number: CN202210600949.XA
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Shanghai Xingsi Semiconductor Co ltd
Current assignee: Shanghai Xingsi Semiconductor Co ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2024-05-03
Anticipated expiration: 2042-05-30
Also published as: CN114826845A

Abstract

The application provides an estimation method applied to an IQ imbalance estimation system, which comprises the steps of determining a first imbalance parameter according to a first received signal and a second received signal acquired by a receiving base frequency unit; the first receiving signal is a signal obtained after the first signal passes through the first filter, the second receiving signal is a signal obtained after the first signal passes through the second filter, and the first signal comprises a signal sent by the transmitting module at a first frequency point. The method provided by the embodiment of the application improves the accuracy of the IQ imbalance estimation method.

Description

IQ imbalance estimation method and device and related equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to an IQ imbalance estimation method, apparatus, and related devices.

Background

IQ imbalance may be interpreted as a phase and amplitude mismatch between In-phase (I) and Quadrature (Q) branches, embodied In that the phase difference between the I-and Q-path signals is not 90 °, and the amplitude gains of the I-and Q-path signals are different. We need to obtain IQ imbalance parameters and compensate the circuits based thereon to improve the radio frequency performance of the wireless communication system.

Currently, IQ imbalance estimation methods are generally: the transmitting module carries out Frequency up-conversion on the base Frequency signal to generate a Radio Frequency (RF) signal, and the receiving base Frequency unit carries out Frequency down-conversion on the RF signal generated by the transmitting module to obtain IQ imbalance parameters of a signal path. The method does not consider the influence of a filter on an IQ signal path on the IQ imbalance parameter, so that the acquired IQ imbalance parameter has deviation from the IQ imbalance parameter in an actual scene. That is, the accuracy of the current IQ imbalance estimation method is poor.

Disclosure of Invention

The embodiment of the application provides an IQ imbalance estimation method, an IQ imbalance estimation device and related equipment, which solve the problem of poor accuracy of the existing IQ imbalance estimation method.

In order to achieve the above object, in a first aspect, an embodiment of the present application provides an estimation method applied to an IQ imbalance estimation system, where the system includes a transmitting module, a receiving module, and the receiving module includes a receiving baseband unit, a receiving in-phase I path and a receiving quadrature Q path;

the receiving I path is provided with a first filter, and the receiving Q path is provided with a second filter;

The receiving baseband unit is connected with the transmitting module through the first filter and the second filter respectively;

The method comprises the following steps:

determining a first imbalance parameter according to the first received signal and the second received signal acquired by the receiving baseband unit;

The first receiving signal is a signal obtained after a first signal passes through the first filter, the second receiving signal is a signal obtained after the first signal passes through the second filter, and the first signal comprises a signal sent by the transmitting module at a first frequency point.

In a second aspect, an embodiment of the present application provides an estimation apparatus applied to an IQ imbalance estimation system, where the system includes a transmitting module and a receiving module, where the receiving module includes a receiving baseband unit, a receiving in-phase I path and a receiving quadrature Q path;

The device comprises:

the first determining module is used for determining a first unbalance parameter according to the first receiving signal and the second receiving signal acquired by the receiving base frequency unit;

In a third aspect, an embodiment of the present application provides an electronic device, including a processor, a memory, and a computer program stored on the memory and executable on the processor, the computer program implementing the steps in the estimation method according to the first aspect when executed by the processor.

In a fourth aspect, an embodiment of the present application provides a readable storage medium having stored thereon a program which, when executed by a processor, implements the steps of the estimation method according to the first aspect.

In the embodiment of the application, the first receiving signal is a signal obtained by the first signal passing through the first filter, and the second receiving signal is a signal obtained by the first signal passing through the second filter. By determining the first imbalance parameter according to the first received signal and the second received signal obtained by the receiving baseband unit, the influence of the filter on the IQ imbalance parameter can be taken into account, thereby improving the accuracy of the IQ imbalance estimation method.

Drawings

For a clearer description of the technical solutions in the embodiments of the present application, the following description will be given with reference to the accompanying drawings, which are obvious to one skilled in the art only, and other drawings can be obtained according to the listed drawings without inventive effort.

FIG. 1 is a schematic diagram of an IQ imbalance estimation system according to an embodiment of the present application;

FIG. 2 is a flow chart of an estimation method according to an embodiment of the present application;

FIG. 3 is a second schematic diagram of an IQ imbalance estimation system according to an embodiment of the present application;

FIG. 4 is a third schematic diagram of an IQ imbalance estimation system according to an embodiment of the present application;

FIG. 5 is a diagram illustrating a structure of an IQ imbalance estimation system according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of an estimation device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art without the exercise of inventive faculty, are intended to be within the scope of the application.

For ease of understanding, the following description will briefly explain the background of the application.

The radio frequency signal refers to a modulated electric wave having a certain emission frequency. The baseband signal refers to an original signal sent from a source (information source, also called a transmitting end) without modulation (spectrum shifting and conversion).

The direct conversion circuit can realize the direct conversion from the radio frequency signal to the baseband signal by adopting the primary mixer, has obvious cost and integration advantage, and is widely used in the field of wireless communication.

However, the direct conversion circuit has a problem of IQ imbalance due to mismatch between hardware circuits of an In-phase (I) signal and a Quadrature (Q) signal. The causes of the mismatch are three: 1) The difference between the I signal and Q signal baseband low pass filters; 2) The phase difference between the I-path local oscillator signal (LO) and the Q-path local oscillator signal is not absolute 90 °; 3) The analog gains of the I and Q radio frequency paths are not exactly the same.

The IQ imbalance brings an image signal of baseband frequency, and the image signal interferes with modulation and demodulation of a desired signal, reducing radio frequency performance of the wireless communication system. Therefore, it is necessary to acquire IQ imbalance parameters and compensate circuits based thereon to improve the radio frequency performance of the wireless communication system.

At present, the IQ imbalance estimation method does not consider the influence of the filter on the IQ signal path on the IQ imbalance parameter, which results in deviation between the acquired IQ imbalance parameter and the IQ imbalance parameter in the actual scene. That is, the accuracy of the current IQ imbalance estimation method is poor. To solve this problem, an embodiment of the present application provides an estimation method applied to an IQ imbalance estimation system, which is described in detail below.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an IQ imbalance estimation system according to an embodiment of the present application, and fig. 2 is a schematic flow chart of an estimation method according to an embodiment of the present application.

As shown in fig. 1, the IQ imbalance estimation system provided by the embodiment of the present application includes a transmitting module and a receiving module, where the receiving module includes a receiving baseband unit, a receiving in-phase I path and a receiving quadrature Q path;

the receiving I path is provided with a first filter, and the receiving Q path is provided with a second filter; the receiving baseband unit is connected with the transmitting module through the first filter and the second filter respectively.

The first filter and the second filter may be low-pass filters. The signal generated by the transmitting module reaches the receiving baseband unit through the first filter and the second filter respectively. Optionally, an analog-to-digital converter (Analog to Digital Converter, ADC) may be further disposed on the receive I path and the receive Q path, and signals generated by the transmitting module pass through the first filter and the ADC, respectively; and a second filter, ADC, to the receive baseband unit.

Even if the same manufacturer and model filters are used as the first filter and the second filter, the first filter and the second filter are difficult to be identical, so that the filter characteristics of the receiving I path and the receiving Q path are difficult to be consistent, which brings IQ imbalance varying with frequency to the system.

In order to consider the influence of the first filter and the second filter on the IQ imbalance parameter and improve the accuracy of estimating IQ imbalance, as shown in fig. 2, an embodiment of the present application provides an estimation method, which includes the following steps:

step 101, determining a first imbalance parameter according to a first received signal and a second received signal acquired by a receiving baseband unit;

In particular, the baseband receiving unit acquires a first received signal and a second received signal, and determines a first imbalance parameter according to the first received signal and the second received signal. Due to the difference between the first filter and the second filter, there is a difference between a first received signal obtained by passing the first signal through the first filter and a second received signal obtained by passing the first signal through the second filter. The first imbalance parameter may be determined based on a difference in amplitude of the first received signal and the second received signal. The first imbalance parameter is determined by determining a difference in amplitude of the first received signal and the second received signal.

As described above, the IQ imbalance of the system varies with frequency, and thus when the first signal includes a signal transmitted by the transmitting module at the first frequency point, the determined first imbalance parameter is the first imbalance parameter of the system at the first frequency point.

Optionally, if all first imbalance parameters of the system on the target frequency band need to be obtained, the transmitting module may be made to sweep and transmit a first signal according to a preset step value, that is, the first signal further includes signals sent by N frequency points of the transmitting module in the target frequency band range, where the first frequency point is any frequency point in the target frequency band range, and in an optional embodiment, frequency differences between adjacent frequency points in the (n+1) frequency points are equal. The first imbalance parameters corresponding to the other frequency points except the N frequency points on the target frequency band can be determined according to the first imbalance parameters corresponding to the N frequency points. If the other frequency point is located between the N-1 frequency point and the N-th frequency point, the frequency is taken as an abscissa, the first imbalance parameter is taken as an ordinate, the first straight line is a connecting line of two first imbalance parameters corresponding to the N-1 frequency point and the N-th frequency point, and the first imbalance parameter of the other frequency point is taken as an ordinate on the first straight line when the other frequency point is taken as an abscissa.

In order to consider the influence of the filter of the transmitting module on the IQ imbalance parameters, the accuracy of the IQ imbalance estimation method is further improved. Optionally, referring to fig. 3, the transmitting module includes a transmitting baseband unit, a transmitting I path and a transmitting Q path;

the transmitting I path is provided with a third filter, and the transmitting Q path is provided with a fourth filter;

The first end of the third filter and the first end of the fourth filter are both connected with the transmitting fundamental frequency unit, the second end of the third filter is used for selectively connecting the first end of the first filter or the first end of the second filter, the second end of the fourth filter is used for selectively connecting the first end of the first filter or the first end of the second filter, and the second end of the first filter and the second end of the second filter are both connected with the receiving fundamental frequency unit;

The third filter and the fourth filter may each be a low pass filter. In the case that the transmitting module includes the above structure, the first signal may be a signal obtained by passing a signal sent by the transmitting baseband unit through the third filter, or the first signal may be a signal obtained by passing a signal sent by the transmitting baseband unit through the fourth filter.

Optionally, digital-to-analog converters (Digital to Analog Converter, DAC) can be further arranged on the transmission I path and the transmission Q path, and signals generated by the transmission fundamental frequency unit can be controlled to pass through the DAC, the third filter, the first filter and the ADC respectively by setting the positions of the selection switches; or DAC, fourth filter, first filter, ADC; or DAC, third filter, second filter, ADC; or DAC, fourth filter, second filter, ADC to the receive baseband unit.

The method further comprises the steps of:

Determining a second imbalance parameter according to the second signal and the third signal acquired by the receiving baseband unit;

the second signal is a signal obtained by the first test signal passing through the third filter and the first filter, and the third signal is a signal obtained by the first test signal passing through the fourth filter and the first filter; the first test signal comprises a signal transmitted by the transmitting base frequency unit at a second frequency point.

In an optional embodiment of the present application, the second signal is a signal obtained by passing the first test signal through the third filter and the second filter, and the third signal is a signal obtained by passing the first test signal through the fourth filter and the second filter.

In particular, when the transmitting baseband unit transmits signals at a second frequency point, if all second imbalance parameters of the system on the target frequency band need to be obtained, the transmitting baseband unit can be made to sweep to transmit the first test signal according to a preset step value, that is, the transmitting baseband unit can also transmit signals at N frequency points within the target frequency band, where the second frequency point is any one of the N frequency points. In an optional embodiment, the first test signal may further include signals sent by N frequency points of the transmitting baseband unit within the target frequency band range, where frequency differences between adjacent frequency points in the N frequency points are equal.

The receiving base frequency unit respectively acquires a second signal obtained by the first test signal after passing through a third filter and the first filter and a third signal obtained by the first test signal after passing through a fourth filter and the second filter. Similar to the first filter and the second filter, there is a difference between the second signal and the third signal due to the difference between the third filter and the fourth filter. The second imbalance parameter may be determined based on a difference in amplitude of the second signal and the third signal. The difference in amplitude of the second signal and the third signal is illustratively determined as a second imbalance parameter. The second imbalance parameter may characterize an effect of a filter of the transmit module on the IQ imbalance parameter.

As shown in fig. 3, if the system provided in the embodiment of the present application further includes a DAC, a first filter, and a second filter. The position of the selection switch can be set to control the first test signal generated by the transmitting fundamental frequency unit to respectively obtain a second signal through the DAC, the third filter, the first filter and the ADC; and the DAC, the fourth filter, the first filter and the ADC obtain a third signal. Or the first test signal generated by the transmission fundamental frequency unit is controlled to respectively pass through the DAC, the third filter, the second filter and the ADC to obtain a second signal; or the DAC, the fourth filter, the second filter and the ADC obtain a third signal.

Referring to fig. 4, fig. 4 is a third schematic structural diagram of an IQ imbalance estimation system according to an embodiment of the present application, where the system further includes a first frequency synthesizer, a second frequency synthesizer, a selection module, a first mixer, and a second mixer;

The first end of the second frequency synthesizer is connected with the first input end of the selection module, the output end of the selection module is respectively connected with the first end of the first frequency mixer and the first end of the second frequency mixer, the first output end of the first frequency synthesizer is connected with the second end of the first frequency mixer, the second output end of the first frequency synthesizer is connected with the second end of the second frequency mixer, the output end of the first frequency mixer is connected with the first end of the receiving baseband unit through the first filter, and the output end of the second frequency mixer is connected with the second end of the receiving baseband unit through the second filter;

In particular, the selection module may be a transmit signal selection module (CAL/TX selector). The local oscillation signals generated by the second frequency synthesizer are transmitted to the first mixer and the second mixer through the selection module, the local oscillation signals are respectively mixed with a group of signals with 90 degrees phase difference generated by the first frequency synthesizer, and the signals with equal amplitude are transmitted to the receiving base frequency unit through the receiving I path and the receiving Q path.

In determining the amplitude and phase imbalance parameters of the receive I and Q paths, the local oscillator LO signals generated by the first frequency synthesizer and the LO signals generated by the second frequency synthesizer (i.e., the first and second LO signals) are mixed at the first and second mixers.

The method further comprises the steps of:

compensating the receiving baseband unit according to the first imbalance parameter, and compensating the transmitting module according to the second imbalance parameter;

determining an amplitude imbalance parameter of the receiving I path and a phase imbalance parameter of the receiving I path according to the third receiving signal and the fourth receiving signal acquired by the receiving baseband unit; and/or determining an amplitude imbalance parameter of the receiving Q path and a phase imbalance parameter of the receiving Q path according to the five received signals and the sixth received signal acquired by the receiving baseband unit;

The third receiving signal is a signal transmitted by a first local oscillator LO signal to a first end of the receiving baseband unit, and the fourth receiving signal is a signal transmitted by a second LO signal to the first end of the receiving baseband unit; the first LO signal and the second LO signal are signals sent by the second frequency synthesizer, the amplitude of the first LO signal is the same as that of the second LO signal, the phase difference is 90 degrees, and the LO frequencies of the first frequency synthesizer and the second frequency synthesizer are the same.

The fifth receive signal is a signal of the first LO signal transmitted to the second end of the receive baseband unit, and the sixth receive signal is a signal of the second LO signal transmitted to the second end of the receive baseband unit.

When determining the amplitude imbalance parameter and the phase imbalance parameter of the receive I-path, referring to fig. 5, first, determining a first imbalance parameter and a second imbalance parameter caused by a filter, compensating the receive baseband unit according to the first imbalance parameter, and compensating the transmit module according to the second imbalance parameter. After that, the second frequency synthesizer sends a first LO signal through the selection module, and the first LO signal sequentially passes through the selection module, the first mixer and the first filter to reach the receiving baseband unit; and the first LO signal sequentially passes through the selection module, the second mixer and the second filter to reach the receiving baseband unit. After that, a second frequency synthesizer sends a second LO signal through a selection module, and the second LO signal sequentially passes through the selection module, the first mixer and the first filter to reach a receiving baseband unit; and the second LO signal sequentially passes through the selection module, the second mixer and the second filter to reach the receiving baseband unit.

When the amplitude imbalance parameter and the phase imbalance parameter of the receiving Q-channel are determined, the second frequency synthesizer sends a first LO signal through the selection module, and the first LO signal sequentially passes through the selection module, the second mixer and the second filter to reach the receiving fundamental frequency unit. After this, a second LO signal is sent by the second frequency synthesizer through the selection module, and the second LO signal passes through the selection module, the second mixer, and the second filter in order to the receiving baseband unit.

The amplitude imbalance parameter a of the receive I-path and the phase imbalance parameter Φ _A of the receive I-path, and the amplitude imbalance parameter b of the receive Q-path and the phase imbalance parameter Φ _B of the receive Q-path may be determined according to the following expressions.

Wherein a ₁ is a third received signal, a ₂ is a fourth received signal, B ₁ is a fifth received signal, and B ₂ is a sixth received signal.

And carrying out mathematical operation according to the expression 1 and the expression 2 to obtain the amplitude imbalance parameter a of the receiving I path and the phase imbalance parameter phi _A of the receiving I path.

The amplitude imbalance parameter b of the receiving Q path and the phase imbalance parameter Φ _B of the receiving Q path can be obtained by performing mathematical operations according to the above expression 3 and expression 4, and the detailed mathematical operations are not described herein.

It should be understood that in the embodiment of the present application, at least the following three implementations are used in determining imbalance parameters of the receive I path and the receive Q path.

Mode one: and determining an amplitude imbalance parameter of the receiving I path and a phase imbalance parameter of the receiving I path according to the third receiving signal and the fourth receiving signal acquired by the receiving baseband unit.

Mode two: determining an amplitude imbalance parameter of the receiving Q path and a phase imbalance parameter of the receiving Q path according to the five received signals and the sixth received signal acquired by the receiving baseband unit

Mode three: and determining an amplitude imbalance parameter of the receiving I path and a phase imbalance parameter of the receiving I path according to the third receiving signal and the fourth receiving signal acquired by the receiving baseband unit, and determining an amplitude imbalance parameter of the receiving Q path and a phase imbalance parameter of the receiving Q path according to the fifth receiving signal and the sixth receiving signal acquired by the receiving baseband unit.

To further determine imbalance parameters of the transmit I path and the transmit Q path of the transmit module, optionally, referring to fig. 4, the system further includes a third mixer, a fourth mixer, and a combiner;

The first end of the third mixer is connected with the transmitting fundamental frequency unit through the third filter, the first end of the fourth mixer is connected with the transmitting fundamental frequency unit through the fourth filter, the second end of the second frequency synthesizer is connected with the second end of the third mixer, the third end of the second frequency synthesizer is connected with the second end of the fourth mixer, the third end of the third mixer and the third end of the fourth mixer are both connected with the input end of the combiner, and the output end of the combiner is connected with the second input end of the selection module;

In specific implementation, the second frequency synthesizer generates a group of signals with equal amplitude and 90 degrees phase difference, and the signals are respectively input into the third mixer and the fourth mixer, the signals output by the third mixer and the fourth mixer are combined into one path at the combiner to obtain a radio frequency signal, and the radio frequency signal and the local oscillation signal are both input into the selection module, and the selection module can select one from the two signals to output through setting.

When the amplitude and phase imbalance parameters of the transmitting I path and the transmitting Q path are determined, the local oscillator LO signal generated by the first frequency synthesizer and the radio frequency RF signal generated by the second frequency synthesizer are mixed at the first mixer and the second mixer.

The method further comprises the steps of:

compensating the system according to the amplitude imbalance parameter of the receiving I path, the phase imbalance parameter of the receiving I path, the amplitude imbalance parameter of the receiving Q path and the phase imbalance parameter of the receiving Q path;

According to the seventh receiving signal and the eighth receiving signal obtained by the receiving baseband frequency unit, determining an amplitude imbalance parameter of the transmitting I path and a phase imbalance parameter of the transmitting I path; and/or determining an amplitude imbalance parameter of the transmitting Q path and a phase imbalance parameter of the transmitting Q path according to the ninth received signal and the tenth received signal acquired by the receiving baseband unit;

Wherein the seventh received signal is a signal transmitted by a first radio frequency RF signal to the first end of the receiving baseband unit, and the eighth received signal is a signal transmitted by a second RF signal to the first end of the receiving baseband unit; the first RF signal and the second RF signal are both signals sent by the second frequency synthesizer, the amplitudes of the first RF signal and the second RF signal are the same, and the phase difference is 90 degrees.

The ninth received signal is a signal transmitted by a first radio frequency RF signal to the second end of the base band unit, and the tenth received signal is a signal transmitted by a second RF signal to the second end of the base band unit.

When the amplitude imbalance parameter and the phase imbalance parameter of the transmitting I path are determined, after being selected by the selection module, the first RF signal reaches the receiving base frequency unit through the first mixer and the first filter, and the receiving base frequency unit obtains a seventh receiving signal; the second RF signal reaches a receiving baseband unit through the first mixer and the first filter, and the receiving baseband unit obtains an eighth receiving signal.

When the phase unbalance parameter of the amplitude unbalance parameter of the transmitting Q path is determined, after being selected by the selection module, the first RF signal reaches the receiving base frequency unit through the second mixer and the second filter, and the receiving base frequency unit obtains a ninth receiving signal; the second RF signal reaches the receiving baseband unit through the second mixer and the second filter, and the tenth receiving signal is obtained by the receiving baseband unit.

The amplitude imbalance parameter of the transmit I path and the phase imbalance parameter of the transmit I path may be determined from the seventh received signal and the eighth received signal according to the similar expression described above; and determining an amplitude imbalance parameter of the transmit Q path and a phase imbalance parameter of the transmit Q path based on the ninth received signal and the tenth received signal.

It should be appreciated that in embodiments of the present application, there are at least the following three implementations in determining imbalance parameters for transmit I path and transmit Q path.

Mode one: and determining the amplitude imbalance parameter of the transmission I path and the phase imbalance parameter of the transmission I path according to the seventh received signal and the eighth received signal acquired by the receiving baseband unit.

Mode two: and determining the amplitude imbalance parameter of the transmitting Q path and the phase imbalance parameter of the transmitting Q path according to the ninth receiving signal and the tenth receiving signal acquired by the receiving baseband unit.

Mode three: and determining the amplitude imbalance parameter of the transmitting I path and the phase imbalance parameter of the transmitting I path according to the seventh receiving signal and the eighth receiving signal acquired by the receiving baseband unit, and determining the amplitude imbalance parameter of the transmitting Q path and the phase imbalance parameter of the transmitting Q path according to the ninth receiving signal and the tenth receiving signal acquired by the receiving baseband unit.

Referring to fig. 5, in determining the amplitude imbalance parameter of the transmit I path and the phase imbalance parameter of the transmit I path; and after the amplitude imbalance parameter of the transmit Q path and the phase imbalance parameter of the transmit Q path, the system may be compensated according to the parameters.

The compensation (namely, calibration) provided by the embodiment of the application adopts a system self-calibration mode, does not need instrument participation, and has the advantage of simple structure.

Referring to fig. 3, an IQ imbalance estimation system according to an embodiment of the present application includes a transmitting module and a receiving module, where the receiving module includes a receiving baseband unit, a receiving in-phase I path, a receiving quadrature Q path, a first transfer switch and a second transfer switch, and the transmitting module includes a transmitting baseband unit, a transmitting I path and a transmitting Q path;

the receiving I path is provided with a first filter, the receiving Q path is provided with a second filter, the transmitting I path is provided with a third filter, and the transmitting Q path is provided with a fourth filter;

The first end of the third filter is connected with the transmitting fundamental frequency unit, the second end of the third filter is connected with the first end of the first change-over switch, the second end of the first change-over switch is used for selectively connecting the first end of the first filter or the first end of the second filter, and the second end of the first filter and the second end of the second filter are both connected with the receiving fundamental frequency unit;

The first end of the fourth filter is connected with the transmitting fundamental frequency unit, the second end of the fourth filter is connected with the first end of the second change-over switch, and the second end of the second change-over switch is used for selectively connecting the first end of the first filter or the first end of the second filter.

In particular, the first transfer switch may be a double pole switch. The double-blade switch of the first transfer switch comprises a first blade and a second blade, wherein the first ends of the first blade and the second blade are connected with the second end of the third filter, the second end of the first blade is connected with the first end of the first filter, and the second end of the second blade is connected with the first end of the second filter.

By opening or closing the blade, at least the following four connection modes can be achieved.

Closing a first switch blade, wherein a first end of the first change-over switch is communicated with a first end of the first filter;

Opening the first switch blade, wherein the first end of the first transfer switch is disconnected with the first end of the first filter;

Closing the second switch blade, wherein the first end of the first change-over switch is communicated with the first end of the second filter;

the second knife is opened, and the first end of the first transfer switch is disconnected from the first end of the second filter.

The second transfer switch may also be a double pole switch. The double-pole switch of the second transfer switch comprises a third pole and a fourth pole. The first ends of the third switch blade and the fourth switch blade are connected with the second end of the fourth filter, the second end of the third switch blade is connected with the first end of the first filter, and the second end of the fourth switch blade is connected with the first end of the second filter.

Closing a third knife switch, wherein the first end of the second transfer switch is communicated with the first end of the first filter;

opening the third switch blade, and disconnecting the first end of the second transfer switch from the first end of the first filter;

Closing the fourth switch blade, wherein the first end of the second transfer switch is communicated with the first end of the second filter;

The fourth blade is opened and the first end of the second transfer switch is disconnected from the first end of the second filter.

It will be appreciated that the closing or opening of the first blade, the second blade, the third blade and the fourth blade are independent of each other and do not affect each other.

By adopting the system provided by the embodiment of the application, two connection modes can be adopted when the first unbalance parameter is determined.

Mode one: closing the first and second blades, opening the third and fourth blades;

Or the mode II: the third blade and the fourth blade are closed, and the first blade and the second blade are opened.

In the first mode, the first signal sent by the transmitting module at the first frequency point reaches the receiving baseband unit through the transmitting I path and the receiving Q path respectively.

In the second mode, the first signal sent by the transmitting module at the first frequency point reaches the receiving baseband unit through the transmitting Q path via the receiving I path and the receiving Q path, respectively.

By adopting the system provided by the embodiment of the application, two connection modes can be adopted when the second unbalance parameter is determined.

Mode three: the first and third blades are closed, and the second and fourth blades are opened.

Or the mode four: closing the second and fourth blades, opening the first and third blades

In the third mode, the first test signal transmitted by the transmitting baseband unit at the second frequency point reaches the receiving baseband unit through the transmitting I path and the receiving I path; and reaches the receiving baseband unit through the transmitting Q path and the receiving I path.

In the fourth mode, the first test signal transmitted by the transmitting baseband unit at the second frequency point reaches the receiving baseband unit through the transmitting I path and the receiving Q path; and reaches the receiving baseband unit through the transmitting Q path and the receiving Q path.

According to the embodiment of the application, through the arrangement, the states of the first change-over switch and the second change-over switch can be switched to flexibly change the structure of the system, so that the first imbalance parameter and the second imbalance parameter can be determined in various optional modes, and the accuracy of the IQ imbalance estimation method is improved.

Optionally, referring to fig. 4, the system further includes a first frequency synthesizer, a second frequency synthesizer, a selection module, a first mixer, a second mixer, a third mixer, a fourth mixer, and a combiner;

The first end of the second frequency synthesizer is connected with the first input end of the selection module, the output end of the selection module is respectively connected with the first end of the first mixer and the first end of the second mixer, the first output end of the first frequency synthesizer is connected with the second end of the first mixer, the second output end of the first frequency synthesizer is connected with the second end of the second mixer, the output end of the first mixer is connected with the first end of the first filter, and the output end of the second mixer is connected with the first end of the second filter;

The first end of the third mixer is connected with the second end of the third filter, the fourth mixer is connected with the second end of the fourth filter, the second end of the second frequency synthesizer is connected with the second end of the third mixer, the third end of the second frequency synthesizer is connected with the second end of the fourth mixer, the third end of the third mixer and the third end of the fourth mixer are both connected with the input end of the combiner, and the output end of the combiner is connected with the second input end of the selection module.

In the embodiment of the present application, the amplitude imbalance parameter and the phase imbalance parameter of the receive I path, the receive Q path, the transmit I path, and the transmit Q path may be determined by the above system structure under the condition that the first switch blade, the second switch blade, the third switch blade, and the fourth switch blade are opened, and the specific process may be referred to the explanation of the corresponding method in the embodiment of the present application, and will not be repeated here.

Referring to fig. 7, an embodiment of the present application provides an estimation apparatus 200 applied to an IQ imbalance estimation system, the system including a transmitting module, a receiving module, the receiving module including a receiving baseband unit, a receiving in-phase I path and a receiving quadrature Q path;

The apparatus 200 includes:

A first determining module 201, configured to determine a first imbalance parameter according to the first received signal and the second received signal acquired by the baseband receiving unit;

Optionally, the transmitting module includes a transmitting baseband unit, a transmitting I path and a transmitting Q path;

the apparatus 200 further comprises:

The second determining module is used for determining a second unbalance parameter according to the second signal and the third signal acquired by the receiving fundamental frequency unit;

the second signal is a signal obtained by the first test signal passing through the third filter and the first filter, and the third signal is a signal obtained by the first test signal passing through the fourth filter and the first filter; or the second signal is a signal obtained by sequentially passing the first test signal through the third filter and the second filter, and the third signal is a signal obtained by sequentially passing the first test signal through the fourth filter and the second filter;

the first test signal comprises a signal transmitted by the transmitting base frequency unit at a second frequency point.

Optionally, the first signal further includes signals sent by the transmitting module at N frequency points in a target frequency band range, where the first frequency point is any frequency point in the target frequency band range.

Optionally, the system further comprises a first frequency synthesizer, a second frequency synthesizer, a selection module, a first mixer, and a second mixer;

the apparatus 200 further comprises:

The first compensation module is used for compensating the receiving baseband unit according to the first unbalanced parameter and compensating the transmitting module according to the second unbalanced parameter;

The third determining module is used for determining the amplitude imbalance parameter of the receiving I path and the phase imbalance parameter of the receiving I path according to the third receiving signal and the fourth receiving signal acquired by the receiving fundamental frequency unit; and/or determining an amplitude imbalance parameter of the receiving Q path and a phase imbalance parameter of the receiving Q path according to the fifth received signal and the sixth received signal acquired by the receiving baseband unit

Optionally, the system further comprises a third mixer, a fourth mixer and a combiner;

the apparatus 200 further comprises:

the second compensation module is used for compensating the system according to the amplitude unbalance parameter of the receiving I path, the phase unbalance parameter of the receiving I path, the amplitude unbalance parameter of the receiving Q path and the phase unbalance parameter of the receiving Q path;

A fourth determining module, configured to determine, according to the seventh received signal and the eighth received signal acquired by the baseband receiving unit, an amplitude imbalance parameter of the transmit I path and a phase imbalance parameter of the transmit I path; and/or determining an amplitude imbalance parameter of the transmitting Q path and a phase imbalance parameter of the transmitting Q path according to the ninth received signal and the tenth received signal acquired by the receiving baseband unit;

The estimation device 200 provided in the embodiment of the present application can implement each process that can be implemented in the embodiment of the estimation method of the present application, and achieve the same beneficial effects, and in order to avoid repetition, a detailed description is omitted herein.

The embodiment of the application provides electronic equipment. As shown in fig. 7, the electronic device 300 includes: a processor 301, a memory 302 and a computer program stored on and executable on said memory 302, the various components in the electronic device 300 being coupled together by a bus system 303. It is understood that the bus system 303 is used to enable connected communication between these components.

The processor 301 is configured to determine a first imbalance parameter according to the first received signal and the second received signal acquired by the baseband receiving unit;

Optionally, the processor 401 is further configured to:

Determining an amplitude imbalance parameter of the receiving I path and a phase imbalance parameter of the receiving I path according to the third receiving signal and the fourth receiving signal acquired by the receiving baseband unit; and/or determining an amplitude imbalance parameter of the receiving Q path and a phase imbalance parameter of the receiving Q path according to the fifth received signal and the sixth received signal acquired by the receiving baseband unit;

Optionally, the processor 401 is further configured to:

The electronic device 300 provided in the embodiment of the present application can implement each process that can be implemented in the embodiment of the estimation method of the present application, and achieve the same beneficial effects, and in order to avoid repetition, a detailed description is omitted herein.

The embodiment of the application also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the processes of the above estimation method embodiment, and can achieve the same technical effects, and in order to avoid repetition, the description is omitted here. The computer readable storage medium is, for example, a Read-Only Memory (ROM), a random access Memory (Random Access Memory RAM), a magnetic disk or an optical disk.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. An estimation method applied to an IQ imbalance estimation system is characterized in that the system comprises a transmitting module and a receiving module, wherein the receiving module comprises a receiving base frequency unit, a receiving in-phase I path and a receiving quadrature Q path;

The method comprises the following steps:

the first receiving signal is a signal obtained after a first signal passes through the first filter, the second receiving signal is a signal obtained after the first signal passes through the second filter, and the first signal comprises a signal sent by the transmitting module at a first frequency point;

The transmitting module comprises a transmitting fundamental frequency unit, a transmitting I path and a transmitting Q path;

The system also comprises a first frequency synthesizer, a second frequency synthesizer, a selection module, a first mixer and a second mixer;

The method further comprises the steps of:

The second signal is a signal obtained by sequentially passing the first test signal through the third filter and the first filter, and the third signal is a signal obtained by sequentially passing the first test signal through the fourth filter and the first filter; or the second signal is a signal obtained by sequentially passing the first test signal through the third filter and the second filter, and the third signal is a signal obtained by sequentially passing the first test signal through the fourth filter and the second filter;

the first test signal comprises a signal transmitted by the transmitting base frequency unit at a second frequency point;

Compensating the receiving baseband unit according to the first imbalance parameter, and compensating the transmitting baseband unit according to the second imbalance parameter;

Determining an amplitude imbalance parameter of the receiving I path and a phase imbalance parameter of the receiving I path according to the third receiving signal and the fourth receiving signal acquired by the receiving baseband unit; and/or determining an amplitude imbalance parameter of the receiving Q path and a phase imbalance parameter of the receiving Q path according to the fifth received signal and the sixth received signal acquired by the receiving baseband unit; the third receiving signal is a signal transmitted by a first local oscillator LO signal to a first end of the receiving baseband unit, and the fourth receiving signal is a signal transmitted by a second LO signal to the first end of the receiving baseband unit; the first LO signal and the second LO signal are signals sent by the second frequency synthesizer, the amplitude of the first LO signal is the same as that of the second LO signal, the phase difference is 90 degrees, and the LO frequencies of the first frequency synthesizer and the second frequency synthesizer are the same;

2. The method of claim 1, wherein the first signal further comprises signals transmitted by the transmitting module at N frequency points within a target frequency band, the first frequency point being any frequency point within the target frequency band.

3. The method of claim 1, wherein the system further comprises a third mixer, a fourth mixer, and a combiner;

The method further comprises the steps of:

Compensating the receiving baseband unit according to the amplitude imbalance parameter of the receiving I path, the phase imbalance parameter of the receiving I path, the amplitude imbalance parameter of the receiving Q path and the phase imbalance parameter of the receiving Q path;

Wherein the seventh received signal is a signal transmitted by a first radio frequency RF signal to the first end of the receiving baseband unit, and the eighth received signal is a signal transmitted by a second RF signal to the first end of the receiving baseband unit; the first RF signal and the second RF signal are both signals sent by the second frequency synthesizer, the amplitudes of the first RF signal and the second RF signal are the same, and the phase difference is 90 degrees;

4. An IQ imbalance estimation system is characterized by comprising a transmitting module, a receiving module, a first change-over switch and a second change-over switch, wherein the transmitting module comprises a transmitting base frequency unit, a transmitting in-phase I path and a transmitting quadrature Q path, and the receiving module comprises a receiving base frequency unit, a receiving I path and a receiving Q path;

The first end of the fourth filter is connected with the transmitting fundamental frequency unit, the second end of the fourth filter is connected with the first end of the second transfer switch, and the second end of the second transfer switch is used for selectively connecting the first end of the first filter or the first end of the second filter;

the system further comprises a first determining module, a second determining module, a first compensating module and a third determining module;

The first determining module is configured to determine a first imbalance parameter according to the first received signal and the second received signal acquired by the baseband receiving unit;

the second determining module is configured to determine a second imbalance parameter according to the second signal and the third signal acquired by the receiving baseband unit;

The third receiving signal is a signal transmitted by a first local oscillator LO signal to a first end of the receiving baseband unit, and the fourth receiving signal is a signal transmitted by a second LO signal to the first end of the receiving baseband unit; the first LO signal and the second LO signal are signals sent by the second frequency synthesizer, the amplitude of the first LO signal is the same as that of the second LO signal, the phase difference is 90 degrees, and the LO frequencies of the first frequency synthesizer and the second frequency synthesizer are the same;

5. The system of claim 4, further comprising a third mixer, a fourth mixer, and a combiner;

The first end of the third mixer is connected with the second end of the third filter, the fourth mixer is connected with the second end of the fourth filter, the second end of the second frequency synthesizer is connected with the second end of the third mixer, the third end of the second frequency synthesizer is connected with the second end of the fourth mixer, the third end of the third mixer and the third end of the fourth mixer are both connected with the input end of the combiner, and the output end of the combiner is connected with the second input end of the selection module;

the system further comprises a second compensation module and a fourth determination module;

the second compensation module is configured to compensate the system according to the amplitude imbalance parameter of the receive I path, the phase imbalance parameter of the receive I path, the amplitude imbalance parameter of the receive Q path, and the phase imbalance parameter of the receive Q path;

The fourth determining module is configured to determine an amplitude imbalance parameter of the transmit I path and a phase imbalance parameter of the transmit I path according to the seventh received signal and the eighth received signal acquired by the receiving baseband unit; and/or determining an amplitude imbalance parameter of the transmitting Q path and a phase imbalance parameter of the transmitting Q path according to the ninth received signal and the tenth received signal acquired by the receiving baseband unit;

6. An estimation device applied to an IQ imbalance estimation system is characterized in that the system comprises a transmitting module and a receiving module, wherein the receiving module comprises a receiving base frequency unit, a receiving in-phase I path and a receiving quadrature Q path;

The device comprises:

The apparatus further comprises:

The first compensation module is used for compensating the receiving fundamental frequency unit according to the first unbalanced parameter and compensating the transmitting fundamental frequency unit according to the second unbalanced parameter;

The third determining module is used for determining the amplitude imbalance parameter of the receiving I path and the phase imbalance parameter of the receiving I path according to the third receiving signal and the fourth receiving signal acquired by the receiving fundamental frequency unit; and/or determining an amplitude imbalance parameter of the receiving Q path and a phase imbalance parameter of the receiving Q path according to the fifth received signal and the sixth received signal acquired by the receiving baseband unit;

7. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, which when executed by the processor implements the steps in the estimation method according to any one of claims 1 to 3.

8. A readable storage medium, characterized in that it has stored thereon a program which, when executed by a processor, implements the steps in the estimation method according to any one of claims 1 to 3.