CN114143159A - Receiver tracking IQ imbalance correction method and device - Google Patents

Receiver tracking IQ imbalance correction method and device Download PDF

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CN114143159A
CN114143159A CN202111493392.6A CN202111493392A CN114143159A CN 114143159 A CN114143159 A CN 114143159A CN 202111493392 A CN202111493392 A CN 202111493392A CN 114143159 A CN114143159 A CN 114143159A
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imbalance
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侯卫兵
雷伟龙
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Beijing Litong Communication Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • H04L27/364—Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
    • H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses a receiver tracking IQ imbalance correction method, which comprises the following steps: estimating IQ imbalance parameters by using a blind estimation method, and carrying out IQ imbalance correction on a receiver by using the obtained IQ imbalance parameters; wherein, when IQ imbalance parameter estimation is carried out, frequency-independent phase imbalance of 45 degrees, 135 degrees, 225 degrees or 315 degrees is introduced. The invention also discloses a receiver tracking IQ imbalance correction device. Compared with other correction methods, the method can ensure that the frequency spectrum resources are not wasted, and can also have extremely low hardware complexity or outstanding performance.

Description

Receiver tracking IQ imbalance correction method and device
Technical Field
The invention relates to the technical field of wireless mobile communication. More particularly, the present invention relates to a receiver tracking IQ imbalance correction method and apparatus.
Background
With the advent of the 5G era, wireless communication systems have increasingly demanded high-speed, wide-bandwidth radio frequency transceivers. There are two main types of radio transceiver architectures: the zero intermediate frequency transceiver and the super heterodyne transceiver have the advantages of low power consumption, high integration degree, simple structure and the like, so that the application is wide. But the zero if transceiver will bring more serious IQ quadrature imbalance problem.
IQ quadrature imbalance means that the phase difference between the I path and the Q path is not equal to 90 degrees, and the gain is not equal, which is mainly caused by a mixer and a baseband low-pass filter. The IQ quadrature imbalance can seriously affect the quality of the demodulated signal of the receiver, so an efficient IQ quadrature imbalance correction algorithm is urgently needed. IQ quadrature imbalance can be classified into frequency-dependent imbalance and frequency-independent imbalance according to properties, and the frequency-dependent imbalance is relatively severe in the case of 5G wide bandwidth. There are many methods for IQ imbalance correction, but most research focuses on off-line correction algorithms. The study of tracking correction algorithms mostly introduces auxiliary signals, which is a waste of radio frequency resources. While others are more complex. Therefore, it is desirable to design a technical solution that can overcome the above-mentioned drawbacks to a certain extent.
Disclosure of Invention
An object of the present invention is to provide a method and an apparatus for correcting IQ imbalance tracking of a receiver, which can ensure that spectrum resources are not wasted and have extremely low hardware complexity or outstanding performance compared to other correction methods.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a receiver tracking IQ imbalance correction method, comprising: estimating IQ imbalance parameters by using a blind estimation method, and carrying out IQ imbalance correction on a receiver by using the obtained IQ imbalance parameters; wherein, when IQ imbalance parameter estimation is carried out, frequency-independent phase imbalance of 45 degrees, 135 degrees, 225 degrees or 315 degrees is introduced.
Further, a method of introducing a frequency independent phase imbalance of 45 °, 135 °, 225 °, or 315 ° comprises: and introducing the gains of corresponding multiples of the I path signal and the Q path signal into an adder arranged on the Q path.
Further, the IQ imbalance parameters include frequency-dependent imbalance parameters and frequency-independent imbalance parameters, and the frequency-dependent imbalance correction and the frequency-independent imbalance correction are performed by using the frequency-dependent imbalance parameters and the frequency-independent imbalance parameters, respectively.
Furthermore, frequency-dependent imbalance correction is performed by using a compensation filter, and frequency-independent imbalance correction is performed by using a phase rotation structure.
Further, 45 degrees of frequency-independent phase unbalance is introduced, unbalance parameters comprise A (f), theta (f) and phi ', a compensation filter is designed according to A (f) and theta (f), frequency-dependent unbalance is corrected, and a phase rotating structure is designed according to phi' to correct frequency-independent unbalance;
Figure BDA0003399258560000021
Figure BDA0003399258560000022
Figure BDA0003399258560000023
wherein σ2(f)＝σ2(-f); a (f) is the frequency domain amplitude characteristic of the low pass filter imbalance; θ (f) is the frequency domain phase characteristic of the low-pass filter imbalance; phi is the unbalanced phase of the mixer; phi' is the unbalanced phase of the rotated mixer; y (f) is a baseband signal frequency domain signal after the demodulation of the receiver; sigma2(f) Frequency domain second moment of the transmitting end sideband signal; e is desired; im is the imaginary part.
According to another aspect of the present invention, there is provided a receiver tracking IQ imbalance correction apparatus, comprising:
an imbalance introducing structure for introducing a frequency independent phase imbalance of 45 °, 135 °, 225 °, or 315 °;
the IQ imbalance parameter estimation module is used for estimating IQ imbalance parameters by utilizing a blind estimation method;
and the IQ imbalance correction structure is used for carrying out IQ imbalance correction on the receiver by utilizing the obtained IQ imbalance parameters.
Further, the unbalance introduction structure includes:
the gain device is used for carrying out corresponding multiple gain on the I path signal and the Q path signal;
and the adder is arranged on the Q path and is used for adding the I path signal and the Q path signal after the gain.
Furthermore, the IQ imbalance parameters comprise frequency-dependent imbalance parameters and frequency-independent imbalance parameters, frequency-dependent imbalance correction and frequency-independent imbalance correction are respectively performed by using the frequency-dependent imbalance parameters and the frequency-independent imbalance parameters, frequency-dependent imbalance correction is performed by using a compensation filter, and frequency-independent imbalance correction is performed by using a phase rotation structure.
Further, 45 degrees of frequency-independent phase unbalance is introduced, unbalance parameters comprise A (f), theta (f) and phi ', a compensation filter is designed according to A (f) and theta (f), frequency-dependent unbalance is corrected, and a phase rotating structure is designed according to phi' to correct frequency-independent unbalance;
Figure BDA0003399258560000031
Figure BDA0003399258560000032
Figure BDA0003399258560000033
wherein σ2(f)＝σ2(-f); a (f) is the frequency domain amplitude characteristic of the low pass filter imbalance; θ (f) is the frequency domain phase characteristic of the low-pass filter imbalance; phi is the unbalanced phase of the mixer; phi' is the unbalanced phase of the rotated mixer; y (f) is a baseband signal frequency domain signal after the demodulation of the receiver; sigma2(f) Frequency domain second moment of the transmitting end sideband signal; e is desired; im is the imaginary part.
According to yet another aspect of the present invention, there is provided a receiver comprising said receiver tracking IQ imbalance correction means.
The invention at least comprises the following beneficial effects:
when the second-order characteristic of a signal is utilized, the structure of the receiver is adjusted, so that the parameter solution is greatly optimized, the result of closed solution is obtained, and the complexity of hardware implementation is very low; the common second-order characteristic solving method cannot directly obtain a closed-form solution, generally speaking, the solution needs higher complexity, and the approximate condition can be utilized in the solving process by adjusting the structure, so that a correction scheme with prominent performance can be obtained in a closed-form solution mode with extremely low complexity.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
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FIG. 1 is a flowchart of the blind estimation tracking IQ imbalance correction method of a wideband zero intermediate frequency RF receiver according to the present invention;
FIG. 2 is a flow chart of a conventional zero IF RF receiver architecture;
fig. 3 is a flow chart of a modified zero intermediate frequency rf receiver structure according to an embodiment of the present invention;
FIG. 4 is a flow chart of an exemplary configuration for compensating for imbalance parameters.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The embodiment of the application provides a receiver tracking IQ imbalance correction method, which comprises the following steps: estimating IQ imbalance parameters by using a blind estimation method, and carrying out IQ imbalance correction on a receiver by using the obtained IQ imbalance parameters; wherein, when IQ imbalance parameter estimation is carried out, frequency-independent phase imbalance of 45 degrees, 135 degrees, 225 degrees or 315 degrees is introduced.
The embodiment provides a low hardware complexity blind estimation tracking IQ imbalance correction method for a broadband zero intermediate frequency receiver. Compared with an offline IQ correction method, the IQ tracking imbalance correction method can update imbalance parameters in time when the imbalance characteristic of the radio frequency transceiver changes, and ensures that the imbalance parameters cannot change due to factors such as temperature and the like in the operation process of a chip, so that the performance is rapidly reduced.
In the specific correction process, firstly, a parameter estimation process is performed, signals received by a receiver are demodulated, after the receiver receives radio frequency signals, the radio frequency signals are demodulated by a mixer to obtain an I path signal and a Q path signal respectively, then the two paths of signals are demodulated by a low pass filter to obtain baseband signals respectively, and imbalance parameters can be calculated by counting the frequency domain second-order statistical characteristics of the baseband signals of the receiver. The imbalance parameter can be obtained by the statistic characteristics of the baseband signal of the receiver because IQ quadrature imbalance changes the statistic characteristics of the IQ quadrature imbalance, and the imbalance parameter can be reversely deduced through the observed result. In order to solve the unbalance parameters more conveniently from the observation results, the structure of the receiver is changed to a certain extent. The present embodiment considers the proposed tracking IQ imbalance correction method for correction under a common rf transceiver architecture. The correction method is to perform correction compensation at the receiving end and correct frequency dependent imbalance and frequency independent imbalance respectively. The structure of a conventional receiver is shown in fig. 2, where a signal is divided into I, Q two paths, and after passing through a mixer and a low-pass filter, the signal is demodulated to a baseband, and this process can be described as follows:
Figure BDA0003399258560000041
sLO(t)＝cos(ωct)-jγsin(ωct+φ)，
y(t)＝LPF{r(t)sLO(t)}＝yI(t)+jyQ(t).
where r (t) represents the radio frequency signal received at the receiver, ωcRepresenting the radio frequency center frequency, z (t) representing the baseband signal at the transmitting end, gamma and phi representing the amplitude imbalance and phase imbalance of the mixer, respectively, y (t) being the baseband signal demodulated by the receiver, sLOAnd (t) is a complex form of two signals of the mixer, and the LPF represents a low-pass filter. The following results can be derived:
Figure BDA0003399258560000051
Figure BDA0003399258560000052
Y(f)＝G1(f)Z(f)+G2(f)Z*(-f)
wherein
Figure BDA0003399258560000053
Figure BDA0003399258560000054
The above derivation results are all frequency domain expressions, HI(f) And HQ(f) The frequency domain responses of the I and Q path low pass filters are shown. For ease of calculation, a new variable is defined:
Figure BDA0003399258560000055
the method adopted by the embodiment is to calculate by using the second-order statistical property of the signal, and the signal can be known to have the following statistical property, sigma, through actual measurement2(f) One variable that represents variation with frequency:
Figure BDA0003399258560000056
E{Z(f)Z*(f-fo)}＝σ2(f)δ(fo)
from the above analysis, the imbalance characteristic is represented by HI(f) Gamma and phi bands, order
A(f)ejθ(f)＝γHD(f)
The parameter solving process only needs to solve for a (f), θ (f) and φ. The following expression can be obtained from the receiving end baseband signal:
E{|Y(f)+Y*(-f)|2}＝σ2(f)+σ2(-f)
Figure BDA0003399258560000057
E{|Y(f)|2-|Y*(-f)|2}＝A(f)σ2(f)cos(θ(f)-φ)-A(-f)σ2(-f)cos(θ(f)+φ)
the parameters cannot be directly solved by the above expressions. In this embodiment, the receiver is structurally adjusted, so that the phase offset is further increased on the basis of the phase imbalance of the mixer, and the difficulty in solving the above expression is reduced. For example, with the structure of fig. 3, compared with fig. 2, fig. 3 adds a phase rotation structure, which further increases the phase deviation of 45 ° based on the phase imbalance of the mixer.
In the embodiment, when parameter estimation is performed, a blind estimation method is adopted, and no auxiliary signal or training sequence is used, so that imbalance parameters can be directly solved through received signals when a receiver normally operates, and the method has the advantages that radio frequency resources are not wasted for parameter estimation, orthogonal imbalance can be corrected, and the frequency spectrum utilization rate of a transceiver is high.
In other embodiments, a method of introducing a frequency independent phase imbalance of 45 °, 135 °, 225 °, or 315 ° comprises: the gain of corresponding multiple of the I path signal and the Q path signal is introduced into an adder arranged on the Q path, fig. 3 shows a structure of introducing 45-degree phase deviation, namely, the Q path signal is amplified by 2 times, and then the I path signal is subtracted, so that phase rotation is realized, and the phase deviation structure of 135 degrees, 225 degrees or 315 degrees is similar.
In other embodiments, the IQ imbalance parameters include a frequency dependent imbalance parameter and a frequency independent imbalance parameter, and the frequency dependent imbalance correction and the frequency independent imbalance correction are performed using the frequency dependent imbalance parameter and the frequency independent imbalance parameter, respectively. The present embodiment adopts the way of compensating frequency dependent imbalance and frequency independent imbalance separately, and this way has the advantage that for the frequency dependent imbalance of wide bandwidth signals, the digital filter way can be used to compensate well in the whole spectrum range, and the complexity is low and the performance is good.
In other embodiments, frequency dependent imbalance correction is performed using a compensation filter, frequency independent imbalance correction is performed using a phase rotation structure, and frequency dependent imbalance correction and frequency independent imbalance correction are performed based on finding A (f), θ (f), and φ. The parameter estimation is followed by a correction structure that corrects for frequency dependent imbalance and frequency independent imbalance separately. The frequency domain correlation imbalance is corrected by adopting a digital filter, the imbalance is mainly caused by the inconsistency of the amplitude and the phase of the I path low-pass filter and the Q path low-pass filter, and the frequency correlation correction performed by the compensation filter can obtain better performance in the whole frequency spectrum. The frequency domain independent imbalance is mainly phase error brought by the mixer, and the phase error is equal at each frequency point of the frequency spectrum, so that the frequency domain independent imbalance can be well compensated by only one phase rotation structure.
In other embodiments, a 45 ° frequency-independent phase imbalance is introduced, such that σ2(f)＝σ2The (-f) approximation holds true;
E{|Y(f)+Y*(-f)|2}＝σ2(f)+σ2(-f)
Figure BDA0003399258560000061
E{|Y(f)|2-|Y*(-f)|2}＝A(f)σ2(f)cos(θ(f)-φ)-A(-f)σ2(-f)cos(θ(f)+φ)
solving the above formula to obtain unbalance parameters A (f), theta (f) and phi ', designing a compensation filter according to A (f) and theta (f), correcting frequency-dependent unbalance, and designing a phase rotation structure according to phi' to correct frequency-independent unbalance; for example, fig. 4 shows a possible calibration method, where comp _ filter is a compensation filter designed according to a (f) and θ (f), the structure formed by the gain device and the adder is a phase rotation structure, z is a phase rotation structure-tDIs a delayer used for delay alignment, and in the whole correction process, there is no matrix operation, and only involves solvingThe desired averaging operation greatly reduces complexity compared to other methods.
Figure BDA0003399258560000071
Figure BDA0003399258560000072
Figure BDA0003399258560000073
Wherein σ2(f)＝σ2(-f); a (f) is the frequency domain amplitude characteristic of the low pass filter imbalance; θ (f) is the frequency domain phase characteristic of the low-pass filter imbalance; phi is the unbalanced phase of the mixer; phi' is the unbalanced phase of the rotated mixer; y (f) is a baseband signal frequency domain signal after the demodulation of the receiver; sigma2(f) Frequency domain second moment of the transmitting end sideband signal; e is desired; im is the imaginary part.
An embodiment of the present application provides a receiver tracking IQ imbalance correction apparatus, including: an imbalance introducing structure for introducing a frequency independent phase imbalance of 45 °, 135 °, 225 °, or 315 °; the IQ imbalance parameter estimation module is used for estimating IQ imbalance parameters by utilizing a blind estimation method; and the IQ imbalance correction structure is used for carrying out IQ imbalance correction on the receiver by utilizing the obtained IQ imbalance parameters. See the description of the methods section for details.
In other embodiments, the imbalance inducing structure comprises: the gain device is used for carrying out corresponding multiple gain on the I path signal and the Q path signal; and the adder is arranged on the Q path and is used for adding the I path signal and the Q path signal after the gain. For example, fig. 3 shows an imbalance introducing structure that introduces a phase offset of 45 °, that is, Q signal is amplified by 2 times and I signal is subtracted to realize phase rotation, and the imbalance introducing structure of 135 °, 225 °, or 315 ° is similar.
In other embodiments, described in the methods section, the IQ imbalance parameters comprise a frequency dependent imbalance parameter and a frequency independent imbalance parameter, the frequency dependent imbalance correction and the frequency independent imbalance correction are performed using the frequency dependent imbalance parameter and the frequency independent imbalance parameter, respectively, the frequency dependent imbalance correction is performed using the compensation filter, and the frequency independent imbalance correction is performed using the phase rotation structure.
In other embodiments, described in the methods section, a 45 ° frequency independent phase imbalance is introduced, and when a 45 ° phase offset is present, σ can be such that2(f)＝σ2The condition (f) is satisfied, and the complexity is greatly reduced when the parameters are solved; the unbalance parameters comprise A (f), theta (f) and phi ', a compensation filter is designed according to A (f) and theta (f), frequency-dependent unbalance is corrected, and a phase rotating structure is designed according to phi' to be subjected to frequency-independent unbalance correction;
Figure BDA0003399258560000081
Figure BDA0003399258560000082
Figure BDA0003399258560000083
wherein σ2(f)＝σ2(-f); a (f) is the frequency domain amplitude characteristic of the low pass filter imbalance; θ (f) is the frequency domain phase characteristic of the low-pass filter imbalance; phi is the unbalanced phase of the mixer; phi' is the unbalanced phase of the rotated mixer; y (f) is a baseband signal frequency domain signal after the demodulation of the receiver; sigma2(f) Frequency domain second moment of the transmitting end sideband signal; e is desired; im is the imaginary part.
Embodiments of the present application provide a receiver comprising said receiver tracking IQ imbalance correction means, the receiver being corrected by the correction means.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present receiver tracking IQ imbalance correction method and apparatus will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (10)

1. A receiver tracking IQ imbalance correction method, comprising:
estimating IQ imbalance parameters by using a blind estimation method, and carrying out IQ imbalance correction on a receiver by using the obtained IQ imbalance parameters;
wherein, when IQ imbalance parameter estimation is carried out, frequency-independent phase imbalance of 45 degrees, 135 degrees, 225 degrees or 315 degrees is introduced.
2. The receiver tracking IQ imbalance correction method according to claim 1, wherein the method of introducing a frequency independent phase imbalance of 45 °, 135 °, 225 ° or 315 ° comprises:
and introducing the gains of corresponding multiples of the I path signal and the Q path signal into an adder arranged on the Q path.
3. The receiver tracking IQ imbalance correction method of claim 1 wherein the IQ imbalance parameters comprise frequency dependent imbalance parameters and frequency independent imbalance parameters, the frequency dependent imbalance correction and the frequency independent imbalance correction being performed using the frequency dependent imbalance parameters and the frequency independent imbalance parameters, respectively.
4. The receiver tracking IQ imbalance correction method of claim 3, wherein frequency dependent imbalance correction is performed using a compensation filter and frequency independent imbalance correction is performed using a phase rotating structure.
5. The receiver tracking IQ imbalance correction method according to claim 4, characterized by introducing 45 ° frequency independent phase imbalance, the imbalance parameters comprising a (f), θ (f) and Φ ', designing the compensation filters according to a (f) and θ (f), correcting the frequency dependent imbalance, designing the phase rotation structure according to Φ' for frequency independent imbalance correction;
Figure FDA0003399258550000011
Figure FDA0003399258550000012
Figure FDA0003399258550000013
wherein σ2(f)＝σ2(-f)；
A (f) is the frequency domain amplitude characteristic of the low pass filter imbalance;
theta (f) is the frequency domain phase characteristic of the low-pass filter imbalance
Phi is the unbalanced phase of the mixer;
phi' is the unbalanced phase of the rotated mixer;
y (f) is a baseband signal frequency domain signal after the demodulation of the receiver;
σ2(f) frequency domain second moment of the transmitting end sideband signal;
e is desired;
im is the imaginary part.
6. A receiver tracking IQ imbalance correction apparatus, comprising:
an imbalance introducing structure for introducing a frequency independent phase imbalance of 45 °, 135 °, 225 °, or 315 °;
the IQ imbalance parameter estimation module is used for estimating IQ imbalance parameters by utilizing a blind estimation method;
and the IQ imbalance correction structure is used for carrying out IQ imbalance correction on the receiver by utilizing the obtained IQ imbalance parameters.
7. The receiver tracking IQ imbalance correction apparatus of claim 6, wherein the imbalance introduction structure comprises:
the gain device is used for carrying out corresponding multiple gain on the I path signal and the Q path signal;
and the adder is arranged on the Q path and is used for adding the I path signal and the Q path signal after the gain.
8. The receiver tracking IQ imbalance correction apparatus in accordance with claim 6, wherein the IQ imbalance parameters include frequency dependent imbalance parameters and frequency independent imbalance parameters, the frequency dependent imbalance correction and the frequency independent imbalance correction are performed using the frequency dependent imbalance parameters and the frequency independent imbalance parameters, respectively, the frequency dependent imbalance correction is performed using the compensation filter, and the frequency independent imbalance correction is performed using the phase rotation structure.
9. The receiver tracking IQ imbalance correction apparatus of claim 8, wherein 45 ° of frequency independent phase imbalance is introduced, the imbalance parameters include a (f), θ (f) and Φ ', the compensation filters are designed according to a (f) and θ (f), the frequency dependent imbalance is corrected, the phase rotation structure is designed according to Φ' for frequency independent imbalance correction;
Figure FDA0003399258550000021
Figure FDA0003399258550000022
Figure FDA0003399258550000031
wherein σ2(f)＝σ2(-f)；
A (f) is the frequency domain amplitude characteristic of the low pass filter imbalance;
theta (f) is the frequency domain phase characteristic of the low-pass filter imbalance
Phi is the unbalanced phase of the mixer;
phi' is the unbalanced phase of the rotated mixer;
y (f) is a baseband signal frequency domain signal after the demodulation of the receiver;
σ2(f) frequency domain second moment of the transmitting end sideband signal;
e is desired;
im is the imaginary part.
10. A receiver comprising the receiver tracking IQ imbalance correction apparatus according to any one of claims 6 to 9.
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CN104052695A (en) * 2013-03-15 2014-09-17 联发科技（新加坡）私人有限公司 Method And Apparatus For Configuring A Frequency Dependent I/q Imbalance Compensation Filter
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CN111314264A (en) * 2020-02-18 2020-06-19 广州全盛威信息技术有限公司 Method and device for calibrating IQ signal
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CN115276683A (en) * 2022-09-27 2022-11-01 北京力通通信有限公司 IQ imbalance blind estimation tracking correction method for zero intermediate frequency broadband radio frequency transmitter
CN115276683B (en) * 2022-09-27 2022-12-20 北京力通通信有限公司 IQ imbalance blind estimation tracking correction method for zero intermediate frequency broadband radio frequency transmitter

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