CN114257253B - Broadband IQ imbalance compensation method and device - Google Patents
Broadband IQ imbalance compensation method and device Download PDFInfo
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- CN114257253B CN114257253B CN202010998099.4A CN202010998099A CN114257253B CN 114257253 B CN114257253 B CN 114257253B CN 202010998099 A CN202010998099 A CN 202010998099A CN 114257253 B CN114257253 B CN 114257253B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0082—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band
- H04B1/0085—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band where one band is the image frequency band of the other and the band selection is done by image rejection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
- H04L27/263—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators modification of IFFT/IDFT modulator for performance improvement
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- 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 broadband IQ imbalance compensation method and a device, wherein the method comprises the steps of obtaining a target carrier wave for executing IQ imbalance compensation operation on a carrier wave system; acquiring a radio frequency waveform of a target carrier wave, and intercepting the target radio frequency waveform from the radio frequency waveform to serve as a Fourier transform window of the target carrier wave; and analyzing the target carrier based on the Fourier transform window to obtain an image carrier of the target carrier, and determining a target compensation coefficient of the image carrier of the target carrier based on the determined search algorithm. Therefore, the invention takes the tail end point of the cyclic prefix in the radio frequency waveform as the waveform starting point to intercept the radio frequency waveform to form a Fourier transform window, and obtains the compensation parameters of the carrier wave, thus being applicable to an OFDM system; the compensation coefficient of the carrier wave is obtained by combining a Fourier transform window and a search algorithm, so that unbalance of amplitude, phase, filtering and time delay can be compensated, the compensation accuracy is high, the problem of ISI is avoided, and CP resources are fully utilized.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for compensating wideband IQ imbalance.
Background
A zero intermediate frequency (Zero Intermediate Frequency, ZIF) transmitter is a transmitter that moves high frequency baseband signals to radio frequencies, reducing power consumption and reducing the chance of external interference to the radio frequency signals relative to a superheterodyne transmitter. However, after the zero intermediate frequency transmitter directly converts the radio frequency signal to zero frequency, the signal has IQ imbalance problems, for example: amplitude imbalance, phase imbalance, filtering imbalance, delay imbalance, etc., severely deteriorate the quality of the transmitted waveform. When the bandwidth of the transmitter is narrow, the amplitude imbalance and the phase imbalance are main contributors of the IQ imbalance, and as the bandwidth of the transmitter increases, the filtering imbalance and the delay imbalance rapidly rise to become main contributors of the IQ imbalance, so how to remove the IQ imbalance, thereby ensuring that the quality of the transmitted waveform becomes a key point.
In practical applications, the IQ imbalance compensation method generally includes the following steps, namely, weighting and summing the transmit waveform and its conjugate waveform in the digital domain, and compensating only for the amplitude imbalance and the phase imbalance: 2. a complex time domain filter system is adopted to compensate the filtering errors of the two IQ paths, and the filtering errors are compensated by the thought of the weighted sum of the I path and the Q path. Moreover, the frequency correlation IQ imbalance characteristic is converted into an equivalent time domain filter, filtering and compensation are carried out in the time domain, the technology is only suitable for a single carrier system with weaker IQ imbalance, and for an OFDM system with stronger IQ imbalance, the compensation method of the time domain filter is poor in compensation precision, and even serious ISI can be brought and the CP utilization efficiency is wasted.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the compensation method and the device for the broadband IQ imbalance, which can be suitable for an OFDM system, can compensate amplitude imbalance, phase imbalance, filtering imbalance and delay imbalance simultaneously, have high compensation precision, can not bring the problem of ISI and fully utilize CP resources.
In order to solve the above technical problems, a first aspect of the embodiments of the present invention discloses a method for compensating wideband IQ imbalance, the method comprising:
when judging that IQ imbalance compensation operation needs to be executed on a carrier system, acquiring a target carrier for executing the IQ imbalance compensation operation on the carrier system;
acquiring a radio frequency waveform of the target carrier, and intercepting a target radio frequency waveform from the radio frequency waveform as a Fourier transform window of the target carrier, wherein the target radio frequency waveform is a radio frequency waveform formed by taking an end point of a cyclic prefix in the radio frequency waveform as a waveform starting point;
analyzing the target carrier based on the Fourier transform window to obtain an image carrier of the target carrier, and determining a target compensation coefficient of the image carrier of the target carrier based on the determined search algorithm, wherein the target compensation coefficient is used for compensating IQ imbalance of the carrier system.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the acquiring a radio frequency waveform of the target carrier includes:
performing precompensation operation on the target carrier according to the determined precompensation coefficient to obtain precompensation signals, and performing inverse Fourier transform operation and guard interval operation on the precompensation signals to obtain precompensation OFDM waveforms;
and inputting the precompensated OFDM waveform into zero intermediate frequency transmitting equipment for analysis to obtain a radio frequency waveform.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the determining, based on the determined search algorithm, a target compensation coefficient of a mirror carrier of the target carrier includes:
respectively acquiring a signal of the target carrier at a first frequency point and a signal of the mirror image carrier of the target carrier at a second frequency point;
and determining a target compensation coefficient of the mirror image carrier of the target carrier according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the mirror image carrier of the target carrier at the second frequency point.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the number of target carriers is greater than 1;
And the calculation formula of the pre-compensation operation is as follows:
wherein a is k Compensation signal representing kth of said target carrierK represents the number of the target carrier, q k Representing the modulated signal on the kth said target carrier, p k Representing a preset compensation coefficient corresponding to the kth target carrier,and the conjugate carrier of the mirror carrier of the kth target carrier.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the determining, according to the compensation signal of the target carrier and the signal of the target carrier at the first frequency point and the signal of the image carrier of the target carrier at the second frequency point, the target compensation coefficient of the image carrier of the target carrier includes:
and determining the image interference power of the image carrier of the target carrier according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the image carrier of the target carrier at the second frequency point, and determining the target compensation coefficient of the image carrier of the target carrier according to the image interference power of the image carrier.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the number of the target carriers is greater than 1, and a corresponding target compensation coefficient exists in each mirror carrier of the target carriers;
And after the determining, based on the determined search algorithm, a target compensation coefficient of the mirror carrier of the target carrier, the method further includes:
judging whether the number of target compensation coefficients in all the target compensation coefficients is larger than or equal to a preset compensation coefficient is larger than or equal to a determined number threshold, and when the number is smaller than the number threshold, re-triggering and executing the operation of acquiring the target carrier for executing the IQ imbalance compensation operation on the carrier system until the number is larger than or equal to the number threshold.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the method further includes:
when the carrier system is in a working state, judging whether the radio frequency waveform generated by the zero intermediate frequency transmitting equipment of the carrier system generates IQ imbalance, and when the judgment result is yes, determining that IQ imbalance compensation operation is required to be executed on the carrier system;
judging whether the carrier system is converted from a non-working state to a working state, and determining that IQ imbalance compensation operation is required to be executed on the carrier system when the judging result is yes;
judging whether an IQ imbalance compensation request aiming at the carrier system is received, and determining that IQ imbalance compensation operation is required to be executed on the carrier system when the judgment result is yes.
The second aspect of the embodiment of the invention discloses a wideband IQ imbalance compensation device, which comprises:
an acquisition module, configured to acquire a target carrier for performing an IQ-imbalance compensation operation on a carrier system when it is determined that the IQ-imbalance compensation operation is required to be performed on the carrier system;
the acquisition module is further used for acquiring the radio frequency waveform of the target carrier;
the intercepting module is used for intercepting a target radio frequency waveform from the radio frequency waveform, and taking the target radio frequency waveform as a Fourier transform window of the target carrier, wherein the target radio frequency waveform is a radio frequency waveform formed by taking the tail end point of a cyclic prefix in the radio frequency waveform as a waveform starting point;
the analysis module is used for analyzing the target carrier based on the Fourier transform window to obtain a mirror image carrier of the target carrier;
and the determining module is used for determining a target compensation coefficient of the mirror carrier of the target carrier based on the determined searching algorithm, wherein the target compensation coefficient is used for compensating IQ imbalance of the carrier system.
In a second aspect of the embodiment of the present invention, the mode of acquiring the radio frequency waveform of the target carrier by the acquiring module is specifically:
Performing precompensation operation on the target carrier according to the determined precompensation coefficient to obtain precompensation signals, and performing inverse Fourier transform operation and guard interval operation on the precompensation signals to obtain precompensation OFDM waveforms;
and inputting the precompensated OFDM waveform into zero intermediate frequency transmitting equipment for analysis to obtain a radio frequency waveform.
In a second aspect of the embodiment of the present invention, the determining module determines the target compensation coefficient of the mirror carrier of the target carrier based on the determined search algorithm specifically includes:
respectively acquiring a signal of the target carrier at a first frequency point and a signal of the mirror image carrier of the target carrier at a second frequency point;
and determining a target compensation coefficient of the mirror image carrier of the target carrier according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the mirror image carrier of the target carrier at the second frequency point.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the number of target carriers is greater than 1;
and the calculation formula of the pre-compensation operation is as follows:
wherein a is k A compensation signal representing the kth target carrier, k representing the number of the target carrier, q k Representing the modulated signal on the kth said target carrier, p k Representing a preset compensation coefficient corresponding to the kth target carrier,and the conjugate carrier of the mirror carrier of the kth target carrier.
In a second aspect of the embodiment of the present invention, the determining module determines, according to the compensation signal of the target carrier and the signal of the target carrier at the first frequency point and the signal of the image carrier of the target carrier at the second frequency point, the target compensation coefficient of the image carrier of the target carrier specifically includes:
and determining the image interference power of the image carrier of the target carrier according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the image carrier of the target carrier at the second frequency point, and determining the target compensation coefficient of the image carrier of the target carrier according to the image interference power of the image carrier.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the number of the target carriers is greater than 1, and there is a corresponding target compensation coefficient for each mirror carrier of the target carriers;
And, the apparatus further comprises:
the first judging module is configured to judge whether the number of target compensation coefficients in all the target compensation coefficients is greater than or equal to a preset compensation coefficient is greater than or equal to a determined number threshold after the determining module determines the target compensation coefficient of the mirror carrier of the target carrier based on the determined search algorithm, and when the number is determined to be smaller than the number threshold, re-trigger the acquiring module to perform the operation of acquiring the target carrier for performing the IQ imbalance compensation operation on the carrier system until the number is greater than or equal to the number threshold.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the apparatus further includes:
the second judging module is used for judging whether the radio frequency waveform generated by the zero intermediate frequency transmitting equipment of the carrier system generates IQ imbalance or not when the carrier system is in a working state;
the determining module is further configured to determine that IQ imbalance compensation operation needs to be performed on the carrier system when the second judging module judges that the result is yes;
the second judging module is used for judging whether the carrier system is converted from a non-working state to a working state;
The determining module is further configured to determine that IQ imbalance compensation operation needs to be performed on the carrier system when the second judging module judges that the result is yes;
the second judging module is configured to judge whether an IQ imbalance compensation request for the carrier system is received;
and the determining module is further configured to determine that IQ imbalance compensation operation needs to be performed on the carrier system when the second judging module judges that the result is yes.
The third aspect of the present invention discloses another wideband IQ imbalance compensation apparatus, comprising:
a memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to perform the method for compensating for wideband IQ imbalance disclosed in the first aspect of the present invention.
A fourth aspect of the invention discloses a computer storage medium storing computer instructions for performing the method of compensating for wideband IQ imbalance disclosed in the first aspect of the invention when called.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
The embodiment of the invention discloses a broadband IQ imbalance compensation method and a broadband IQ imbalance compensation device, wherein the method comprises the steps of acquiring a target carrier wave for executing IQ imbalance compensation operation on a carrier system when judging that IQ imbalance compensation operation is required to be executed on the carrier system; acquiring a radio frequency waveform of a target carrier wave, and intercepting the target radio frequency waveform from the radio frequency waveform as a Fourier transform window of the target carrier wave, wherein the target radio frequency waveform is formed by taking an end point of a cyclic prefix in the radio frequency waveform as a waveform starting point; analyzing the target carrier based on the Fourier transform window to obtain an image carrier of the target carrier, and determining a target compensation coefficient of the image carrier of the target carrier based on the determined search algorithm, wherein the target compensation coefficient is used for compensating IQ imbalance of the carrier system. Therefore, when the IQ imbalance compensation is judged to be required to be executed on the carrier system, the embodiment of the invention cuts the radio frequency waveform by taking the tail end point of the cyclic prefix in the radio frequency waveform as the waveform starting point to form the Fourier transform window, acquires the compensation parameters of the carrier, can be suitable for the OFDM system, and acquires the compensation coefficients of the carrier by combining the Fourier transform window and the search algorithm, can compensate the imbalance of amplitude, the imbalance of phase, the imbalance of filtering and the imbalance of delay at the same time, has high compensation precision, does not bring the problem of ISI and fully utilizes the CP resource.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for compensating for broadband IQ imbalance according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for compensating for broadband IQ imbalance according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a wideband IQ imbalance compensation apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another wideband IQ imbalance compensation apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a configuration of a compensation apparatus for broadband IQ imbalance according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a carrier system according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or device that comprises a list of steps or elements is not limited to the list of steps or elements but may, in the alternative, include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention discloses a broadband IQ imbalance compensation method and device, which can intercept a radio frequency waveform by taking the tail end point of a cyclic prefix in the radio frequency waveform as a waveform starting point to form a Fourier transform window when judging that IQ imbalance compensation is required to be carried out on a carrier system, acquire compensation parameters of a carrier, adapt to an OFDM system, acquire the compensation coefficients of the carrier by combining the Fourier transform window and a search algorithm, simultaneously compensate for amplitude imbalance, phase imbalance, filtering imbalance and delay imbalance, have high compensation precision, do not bring the problem of ISI and fully utilize CP resources. The following will describe in detail.
Example 1
Referring to fig. 1, fig. 1 is a flow chart of a method for compensating for broadband IQ imbalance according to an embodiment of the present invention, as shown in fig. 1, the method for compensating for broadband IQ imbalance may include the following operations:
101. when it is determined that the IQ-imbalance compensation operation needs to be performed on the carrier system, a target carrier for performing the IQ-imbalance compensation operation on the carrier system is acquired.
In the embodiment of the present invention, optionally, the number of target carriers is greater than or equal to 1. Further optionally, the carrier system comprises a compensation coefficient estimation module. The target carrier may be obtained from the compensation coefficient estimation module or from other authorized terminal devices. When the target carrier wave is obtained from the compensation coefficient estimation module, the compensation coefficient estimation module continuously outputs the target carrier wave, so that the uninterrupted output of the target carrier wave is beneficial to sequentially obtaining the target compensation coefficient corresponding to each target carrier wave, and the target compensation coefficient obtaining efficiency and accuracy corresponding to each target carrier wave are improved.
102. And acquiring a radio frequency waveform of the target carrier, and intercepting the target radio frequency waveform from the radio frequency waveform to serve as a Fourier transform window of the target carrier.
In the embodiment of the invention, the target radio frequency waveform is a radio frequency waveform formed by taking the tail end point of the cyclic prefix in the radio frequency waveform as a waveform starting point.
As an optional implementation manner, acquiring the radio frequency waveform of the target carrier includes:
performing precompensation operation on the target carrier according to the determined precompensation coefficient to obtain precompensation signals, and performing inverse Fourier transform operation and guard interval operation on the precompensation signals to obtain precompensation OFDM waveforms;
and inputting the precompensated OFDM waveform into zero intermediate frequency transmitting equipment for analysis to obtain a radio frequency waveform.
In this alternative embodiment, the precompensation coefficient may be obtained by the compensation coefficient estimation module or may be obtained from a memory of the carrier system.
In this alternative embodiment, the carrier system comprises a precompensation module and/or a zero intermediate frequency transmitting device.
In this optional embodiment, optionally, when the number of target carriers is greater than 1, the calculation formula of the precompensation operation is as follows:
wherein a is k A compensation signal representing the kth target carrier, k representing the number of the target carrier, q k Representing the modulated signal on the kth target carrier, p k Representing the preset compensation coefficient corresponding to the kth target carrier,conjugate carrier of mirror carrier of kth target carrier.
In this alternative embodiment, the calculation formula of the pre-compensated OFDM waveform is as follows:
where x (n) represents a precompensated OFDM waveform, a I,k 、a Q,k Precompensation signals a respectively representing the kth target carrier k Of (f) Δ Represents the width of the kth target carrier, n represents the sample point time, e represents the natural constant, j represents the imaginary unit, f s Representing the variance width of the carrier.
In this alternative embodiment, optionally, the rf waveform of the target carrier is calculated as follows:
where s represents the RF waveform of the target carrier, g represents IQ amplitude imbalance, h (t) represents IQ filtering imbalance, τ represents IQ delay imbalance, φ represents IQ phase imbalance,representing convolution operation, f c Representing the width factor of the carrier.
It can be seen that this alternative embodiment can achieve the acquisition of the radio frequency waveform of the carrier by the frequency domain compensation method, that is, performing the pre-compensation operation on the carrier before the IFFT, performing the inverse fourier transform on the pre-compensated signal, adding the guard interval (CP), and then passing through the zero intermediate frequency transmitting device, and performing the pre-compensation operation on the carrier before the IFFT, which is beneficial to further improving the compensation accuracy, and is applicable to the OFDM carrier system.
103. And analyzing the target carrier based on the Fourier transform window to obtain an image carrier of the target carrier, and determining a target compensation coefficient of the image carrier of the target carrier based on the determined search algorithm.
In the embodiment of the invention, the target compensation coefficient is used for compensating IQ imbalance of the carrier system.
In the embodiment of the invention, the searching algorithm can comprise one or more algorithms which can realize coefficient searching, such as Breadth First Searching (BFS), depth First Searching (DFS), hill climbing (Hil limbic), optimal first algorithm (Best-first search strategy), backtracking (Backtracking), branch limiting algorithm (Branch-and-bound Search Algorithm), A-class algorithm and the like.
In the embodiment of the invention, the target carrier is analyzed based on the Fourier transform window to obtain the mirror carrier of the target carrier, and the method is specific: simplifying the target carrier wave in a Fourier transform window to obtain a mirror image carrier wave of the target carrier wave
Wherein, the simplified target waveform is as follows:
wherein H (k) andindicating that h (t) is at kf Δ Amplitude and phase response at the same.
In this alternative embodiment, as an alternative embodiment, determining the target compensation coefficient of the mirror carrier of the target carrier based on the determined search algorithm includes:
Respectively acquiring signals of mirror image carriers of signal target carriers of the target carriers at a first frequency point at a second frequency point;
and determining a target compensation coefficient of the mirror image carrier of the target carrier according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the mirror image carrier of the target carrier at the second frequency point.
In this optional embodiment, optionally, determining the target compensation coefficient of the image carrier of the target carrier according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point, and the signal of the image carrier of the target carrier at the second frequency point includes:
according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the mirror carrier of the target carrier at the second frequency point, the mirror image interference power of the mirror carrier of the target carrier is determined, and according to the mirror image interference power of the mirror carrier, the target compensation coefficient of the mirror carrier of the target carrier is determined.
In this alternative embodiment, it can be seen from the simplified target waveform that IQ imbalance results in a precompensated signal for the target carrier at f c +kf Δ The signal at the (first frequency point) frequency point is at f c -kf Δ The image component is generated at the frequency (second frequency point), and at this time, the low-pass equivalent of the signals at the two frequency points can be expressed as:
That is, the kth target carrier generates b for the kth target carrier (the mirror carrier of the target carrier) CyclicConv，k，imag Image disturbance represented by (t)At this time, thenSubstitution b CyclicConv,k,imag (t) constructing the signal expression on the-k-th target carrier as follows:
at this time, the interference power of the kth target carrier to the image carrier of the kth target carrier is as follows:
wherein P is -k,imag Representing the interference power, p, of the image carrier of the kth target carrier -k Representing the target compensation coefficient of the mirror carrier of the kth target carrier.
Therefore, according to the alternative implementation mode, the acquisition of the image carrier of the carrier can be realized through the frequency point signal of the carrier, the frequency point signal of the image carrier of the carrier and the pre-compensation signal of the carrier, and the acquisition efficiency and accuracy of the image carrier of the carrier are improved, so that the acquisition efficiency and accuracy of the compensation coefficient of the image carrier of the carrier are further improved.
In an alternative embodiment, the wideband IQ imbalance compensation method may further comprise the following operations:
when the carrier system is in a working state, judging whether the radio frequency waveform generated by zero intermediate frequency transmitting equipment of the carrier system generates IQ imbalance, and when the judgment result is yes, determining that IQ imbalance compensation operation is required to be executed on the carrier system;
Judging whether the carrier system is converted from a non-working state to a working state, and determining that IQ imbalance compensation operation is required to be executed on the carrier system when the judging result is yes;
judging whether an IQ imbalance compensation request for the carrier system is received, and when the judgment result is yes, determining that IQ imbalance compensation operation needs to be executed on the carrier system.
In this optional embodiment, optionally, when it is determined that the radio frequency waveform generated by the zero intermediate frequency transmitting device of the carrier system does not generate IQ imbalance, the working state of the carrier system is continuously maintained. Further optionally, when the carrier system is in a working state, the carrier system receives a modulation signal sent by the peripheral device, and inputs the modulation signal into the packet mapping module for analysis, so as to obtain a plurality of sub-carriers carrying the modulation signal, that is, each sub-carrier carries the modulation signal, and inputs each sub-carrier into the precompensation module in sequence for analysis, at this time, the steps of analyzing the sub-carrier input precompensation module and performing the subsequent operations with respect to the target carrier input precompensation module are referred to above, and will not be described herein.
In this alternative embodiment, the non-operating state of the carrier system includes an off state or a standby state.
Therefore, in this optional embodiment, by judging that the zero intermediate frequency transmitting device of the carrier system generates the waveform to generate IQ imbalance or the carrier system is converted from the non-working state to the working state or for the IQ imbalance compensation request of the carrier system, the determination manner of executing IQ imbalance compensation on the carrier system can be enriched, so that the determination flexibility and possibility of executing IQ imbalance compensation on the carrier system can be improved.
In another alternative embodiment, after the completion of step 103, the wideband IQ imbalance compensation method may further comprise the following operations:
and calculating the difference value between the target compensation coefficient and the determined optimal compensation coefficient, judging whether the difference value is in the determined difference value range, and determining that the target compensation coefficient is the optimal compensation coefficient of the mirror sub-carrier when the judging result is yes.
In this alternative embodiment, when it is determined that the difference is no longer within the range, the optimal compensation coefficient of the mirror carrier in the target carrier is removed, and step 101 is performed again.
It can be seen that, in this optional embodiment, after the compensation coefficient of the mirror carrier of the target carrier is obtained, further by determining whether the difference between the compensation coefficient and the optimal compensation coefficient is smaller, if so, outputting the compensation coefficient in the precompensation module, if so, discarding the compensation coefficient, and restarting to perform the operation of obtaining the appropriate compensation coefficient, the possibility of obtaining the appropriate compensation coefficient can be improved, so that the possibility and reliability of compensating the IQ imbalance of the zero intermediate frequency transmitting device are improved.
In yet another alternative embodiment, after the completion of step 103, the wideband IQ imbalance compensation method may further comprise the following operations:
and performing noise reduction processing on the target compensation coefficient of the mirror image carrier of the target carrier based on the determined interpolation noise reduction algorithm to obtain a target compensation coefficient after noise reduction, and inputting the target compensation coefficient after noise reduction into a pre-compensation module to perform IQ imbalance adjustment on zero intermediate frequency transmitting equipment.
In this alternative embodiment, the interpolation noise reduction algorithm may include one or a combination of algorithms that can implement noise reduction, such as nearest neighbor interpolation, bilinear interpolation, and bicubic interpolation.
It can be seen that, after the compensation coefficient is obtained, the optional embodiment further performs a noise reduction operation on the compensation coefficient, so that noise in the compensation coefficient can be removed, which is beneficial to improving the acquisition accuracy of the compensation coefficient, thereby further improving the compensation accuracy and reliability of IQ imbalance compensation.
In yet another alternative embodiment, the wideband IQ imbalance compensation method may further comprise the following operations:
when the condition that the IQ imbalance compensation operation is required to be performed on the carrier system is that the carrier system generates IQ imbalance, recording the signal attribute of the modulation signal received by the carrier system, establishing the association relation between the signal attribute and the target compensation coefficient, and storing the association relation.
In this alternative embodiment, the signal properties of the modulated signal include at least one of a type of the modulated signal, a wavelength of the modulated signal, a frequency of the modulated signal, and a same time when the modulated signal is input to the carrier wave.
Therefore, when determining that the condition of performing the IQ-imbalance compensation operation on the carrier system is the IQ-imbalance of the carrier system, the alternative embodiment can be convenient for directly obtaining the compensation coefficient of the modulation signal when encountering the modulation signal with the same attribute later by establishing the association relation between the signal attribute of the modulation signal and the target compensation coefficient, thereby improving the IQ-imbalance compensation efficiency while ensuring the IQ-imbalance compensation accuracy, and further reducing the influence on the normal operation of the carrier system.
Therefore, when the implementation of the wideband IQ imbalance compensation method described in fig. 1 can determine that IQ imbalance compensation needs to be performed on a carrier system, a fourier transform window is formed by intercepting a radio frequency waveform by taking the end point of a cyclic prefix in the radio frequency waveform as a waveform starting point, and compensation parameters of the carrier are obtained.
Example two
Referring to fig. 2, fig. 2 is a flow chart of another method for compensating for broadband IQ imbalance according to an embodiment of the present invention. As shown in fig. 2, the compensation method of broadband IQ imbalance may include the following operations:
201. when it is judged that IQ imbalance compensation operation is required to be performed on the carrier system, target carriers for performing IQ imbalance compensation operation on the carrier system are acquired, the number of the target carriers being greater than 1.
202. And acquiring a radio frequency waveform of the target carrier, and intercepting the target radio frequency waveform from the radio frequency waveform to serve as a Fourier transform window of the target carrier.
In the embodiment of the invention, the target radio frequency waveform is a radio frequency waveform formed by taking the tail end point of the cyclic prefix in the radio frequency waveform as a waveform starting point.
203. Analyzing the target carrier based on the Fourier transform window to obtain the mirror carrier of the target carrier, and determining the target compensation coefficient of the mirror carrier of the target carrier based on the determined search algorithm, wherein the mirror carrier of each target carrier has a corresponding target compensation coefficient.
In the embodiment of the invention, the target compensation coefficient is used for compensating IQ imbalance of the carrier system.
204. Judging whether the number of the target compensation coefficients in all the target compensation coefficients is larger than or equal to the preset compensation coefficients is larger than or equal to the determined number threshold, and when the number is smaller than the number threshold, re-triggering the execution step 201 until the number is larger than or equal to the number threshold. And ending the flow when the number threshold value is larger than or equal to the number threshold value.
In the embodiment of the present invention, please refer to the detailed description of step 101 to step 103 in the first embodiment for the description of step 201 to step 203, and the description of the embodiment of the present invention is omitted.
Therefore, in the embodiment of the invention, after the target compensation coefficient of the carrier is obtained, whether the number of the better target compensation coefficients is more or not is further judged, if not, the better target compensation coefficients are continuously obtained, and if yes, IQ imbalance compensation is determined to be completed, the IQ imbalance compensation accuracy and reliability can be improved, and the normal operation of the carrier system is ensured.
In this alternative embodiment, when the number is determined to be greater than or equal to the number threshold, all the coefficients with the target compensation coefficients being greater than or equal to the preset compensation coefficient are input into the pre-compensation module.
In an alternative embodiment, the wideband IQ imbalance compensation method may comprise the following operations:
and when the judgment result of the step 204 is yes, performing noise reduction processing on all target compensation coefficients which are larger than or equal to the preset compensation coefficient based on the determined interpolation noise reduction algorithm to obtain a target compensation coefficient after noise reduction, and inputting the target compensation coefficient after noise reduction into a pre-compensation module to perform IQ imbalance adjustment on zero intermediate frequency transmitting equipment.
It can be seen that, after the compensation coefficient is obtained, the optional embodiment further performs a noise reduction operation on the compensation coefficient, so that noise in the compensation coefficient can be removed, which is beneficial to improving the acquisition accuracy of the compensation coefficient, thereby further improving the compensation accuracy and reliability of IQ imbalance compensation.
Therefore, when the wideband IQ imbalance compensation method described in fig. 2 is implemented, it can intercept the radio frequency waveform by taking the end point of the cyclic prefix in the radio frequency waveform as the waveform starting point to form a fourier transform window, and acquire the compensation parameters of the carrier wave, so that the method can be suitable for an OFDM system, and acquire the compensation coefficients of the carrier wave by combining the fourier transform window and a search algorithm, and can compensate for amplitude imbalance, phase imbalance, filtering imbalance and delay imbalance at the same time, and has high compensation precision, so that the problem of ISI is not brought, and CP resources are fully utilized. In addition, the IQ imbalance compensation accuracy and reliability can be improved, and the normal operation of the carrier system can be ensured.
Example III
Referring to fig. 3, fig. 3 is a schematic structural diagram of a wideband IQ imbalance compensation apparatus according to an embodiment of the present invention. As shown in fig. 3, the wideband IQ imbalance compensation apparatus may include an acquisition module 301, an interception module 302, an analysis module 303, and a determination module 304, where:
An obtaining module 301, configured to obtain a target carrier for performing an IQ-imbalance compensation operation on a carrier system when it is determined that the IQ-imbalance compensation operation is required to be performed on the carrier system.
The acquiring module 301 is further configured to acquire a radio frequency waveform of the target carrier.
The interception module 302 is configured to intercept a target radio frequency waveform from the radio frequency waveform, as a fourier transform window of the target carrier, where the target radio frequency waveform is a radio frequency waveform formed by taking an end point of a cyclic prefix in the radio frequency waveform as a waveform starting point.
And the analysis module 303 is configured to analyze the target carrier based on the fourier transform window, and obtain an image carrier of the target carrier.
A determining module 304, configured to determine a target compensation coefficient of the image carrier of the target carrier based on the determined search algorithm, where the target compensation coefficient is used to compensate for IQ imbalance of the carrier system.
Therefore, when the wideband IQ imbalance compensation device described in fig. 3 is implemented, it can intercept the radio frequency waveform by taking the end point of the cyclic prefix in the radio frequency waveform as the waveform starting point to form a fourier transform window, and acquire the compensation parameters of the carrier, so that the wideband IQ imbalance compensation device can be suitable for an OFDM system, and acquire the compensation coefficients of the carrier by combining the fourier transform window and a search algorithm, and can compensate for amplitude imbalance, phase imbalance, filtering imbalance and delay imbalance at the same time, and has high compensation precision, so that the problem of ISI is not brought, and CP resources are fully utilized.
In an alternative embodiment, the manner in which the acquiring module 301 acquires the radio frequency waveform of the target carrier is specifically:
performing precompensation operation on the target carrier according to the determined precompensation coefficient to obtain precompensation signals, and performing inverse Fourier transform operation and guard interval operation on the precompensation signals to obtain precompensation OFDM waveforms;
and inputting the precompensated OFDM waveform into zero intermediate frequency transmitting equipment for analysis to obtain a radio frequency waveform.
In this alternative embodiment, optionally, the number of target carriers is greater than 1. The calculation formula of the precompensation operation is as follows:
wherein a is k A compensation signal representing the kth target carrier, k representing the number of the target carrier, q k Representing the modulated signal on the kth target carrier, p k Representing the preset compensation coefficient corresponding to the kth target carrier,conjugate carrier of mirror carrier of kth target carrier.
It can be seen that this alternative embodiment can achieve the acquisition of the radio frequency waveform of the carrier by the frequency domain compensation method, that is, performing the pre-compensation operation on the carrier before the IFFT, performing the inverse fourier transform on the pre-compensated signal, adding the guard interval (CP), and then passing through the zero intermediate frequency transmitting device, and performing the pre-compensation operation on the carrier before the IFFT, which is beneficial to further improving the compensation accuracy, and is applicable to the OFDM carrier system.
In another alternative embodiment, the determining module 304 determines the target compensation coefficient of the image carrier of the target carrier based on the determined search algorithm specifically by:
respectively acquiring a signal of a target carrier at a first frequency point and a signal of an image carrier of the target carrier at a second frequency point;
and determining a target compensation coefficient of the mirror image carrier of the target carrier according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the mirror image carrier of the target carrier at the second frequency point.
In this alternative embodiment, the determining module 304 determines, according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point, and the signal of the mirror carrier of the target carrier at the second frequency point, the target compensation coefficient of the mirror carrier of the target carrier specifically is:
according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the mirror carrier of the target carrier at the second frequency point, the mirror image interference power of the mirror carrier of the target carrier is determined, and according to the mirror image interference power of the mirror carrier, the target compensation coefficient of the mirror carrier of the target carrier is determined.
Therefore, according to the alternative implementation mode, the acquisition of the image carrier of the carrier can be realized through the frequency point signal of the carrier, the frequency point signal of the image carrier of the carrier and the pre-compensation signal of the carrier, and the acquisition efficiency and accuracy of the image carrier of the carrier are improved, so that the acquisition efficiency and accuracy of the compensation coefficient of the image carrier of the carrier are further improved.
In another alternative embodiment, the number of target carriers is greater than 1, and there is a corresponding target compensation coefficient for each of the target carriers' mirror carriers. As shown in fig. 4, the apparatus may further include a first determining module 305, where:
a first determining module 305, configured to determine, after the determining module 304 determines the target compensation coefficient of the mirror carrier of the target carrier based on the determined search algorithm, whether the number of target compensation coefficients in all target compensation coefficients is greater than or equal to a preset compensation coefficient is greater than or equal to a determined number threshold, and when it is determined that the number is less than the number threshold, re-trigger the acquiring module 301 to perform the above-mentioned operation of acquiring the target carrier for performing the IQ imbalance compensation operation on the carrier system until the number is greater than or equal to the number threshold.
It can be seen that, the implementation of the wideband IQ-imbalance compensation apparatus described in fig. 4 further determines whether the number of the preferred target compensation coefficients is greater after the target compensation coefficients of the carrier are obtained, if not, the preferred target compensation coefficients are continuously obtained, if yes, the IQ-imbalance compensation is determined to be completed, so that the accuracy and reliability of IQ-imbalance compensation can be improved, and the normal operation of the carrier system can be ensured.
In yet another alternative embodiment, as shown in fig. 4, the apparatus further includes a second determining module 306, where:
the second judging module 306 is configured to judge whether IQ imbalance is generated in the radio frequency waveform generated by the zero intermediate frequency transmitting device of the carrier system when the carrier system is in the working state.
The determining module 304 is further configured to determine that IQ imbalance compensation operation needs to be performed on the carrier system when the second determining module 306 determines that the determination result is yes.
A second judging module 306, configured to judge whether the carrier system is switched from the non-working state to the working state.
The determining module 304 is further configured to determine that IQ imbalance compensation operation needs to be performed on the carrier system when the second determining module 306 determines that the determination result is yes.
A second determining module 306 is configured to determine whether an IQ imbalance compensation request for the carrier system is received.
The determining module 304 is further configured to determine that IQ imbalance compensation operation needs to be performed on the carrier system when the second determining module 306 determines that the determination result is yes.
As can be seen, implementing the wideband IQ-imbalance compensation apparatus described in fig. 4 can enrich the determination modes that require IQ-imbalance compensation to be performed on the carrier system by determining that the zero intermediate frequency transmitting device of the carrier system generates waveforms to generate IQ-imbalance or that the carrier system is converted from a non-operating state to an operating state or for the IQ-imbalance compensation request of the carrier system, thereby improving the determination flexibility and possibility that require IQ-imbalance compensation to be performed on the carrier system.
In yet another alternative embodiment, as shown in fig. 4, the analysis module 303 is further configured to calculate a difference between the target compensation coefficient and the determined optimal compensation coefficient after the determining module 304 determines the target compensation coefficient of the image carrier of the target carrier based on the determined search algorithm.
The first determining module 305 is further configured to determine whether the difference value is within the determined difference value range;
the determining module 304 is further configured to determine that the target compensation coefficient is an optimal compensation coefficient of the mirror sub-carrier when the first determining module 305 determines that the result is yes.
It can be seen that, by implementing the compensation device for broadband IQ imbalance described in fig. 4, after obtaining the compensation coefficient of the mirror carrier of the target carrier, further determining whether the difference between the compensation coefficient and the optimal compensation coefficient is smaller, if so, outputting the compensation coefficient in the pre-compensation module, if so, discarding the compensation coefficient, and restarting to perform the operation of obtaining the appropriate compensation coefficient, the possibility of obtaining the appropriate compensation coefficient can be improved, so as to improve the possibility and reliability of compensating the IQ imbalance of the zero intermediate frequency transmitting device.
In yet another alternative embodiment, as shown in fig. 4, the analyzing module 303 is further configured to, after the determining module 304 determines the target compensation coefficient of the image carrier of the target carrier based on the determined searching algorithm, perform a noise reduction process on the target compensation coefficient of the image carrier of the target carrier based on the determined interpolation noise reduction algorithm, obtain a target compensation coefficient after noise reduction, and input the target compensation coefficient after noise reduction into the pre-compensation module to perform IQ imbalance adjustment on the zero intermediate frequency transmitting device.
It can be seen that, the implementation of the wideband IQ-imbalance compensation apparatus described in fig. 4 can remove noise in the compensation coefficient by further performing the noise reduction operation on the compensation coefficient after obtaining the compensation coefficient, which is beneficial to improving the acquisition accuracy of the compensation coefficient, thereby further improving the compensation accuracy and reliability of IQ-imbalance compensation.
Example IV
Referring to fig. 5, fig. 5 shows a compensation apparatus for wideband IQ imbalance according to an embodiment of the present invention. As shown in fig. 5, the wideband IQ imbalance compensation apparatus may include:
a memory 501 in which executable program codes are stored;
a processor 502 coupled to the memory 501;
further, an input interface 503 and an output interface 504 coupled to the processor 502 may also be included;
the processor 502 invokes executable program codes stored in the memory 501 for executing the steps of the wideband IQ imbalance compensation method described in the first or second embodiment.
Example five
For explaining the working principle of the carrier system in the service working state, please refer to fig. 6, fig. 6 is a schematic diagram of the carrier system disclosed in the embodiment of the present invention, wherein the schematic diagram includes a packet mapping module, a precompensation module, an IFFT module, a zero intermediate frequency transmitter and a compensation coefficient estimation module, in which:
The modulating signal b enters a grouping mapping module in a grouping mode, the grouping mapping module groups and maps the modulating signal q to the positions of a plurality of subcarriers to obtain a plurality of grouping modulating signals q, namely a plurality of subcarriers bearing the modulating signal b, wherein the plurality of subcarriers are available subcarriers, zero padding processing is carried out on unused subcarriers, at the moment, a switch between a pre-compensation module and the grouping mapping module is arranged to the grouping mapping module, the grouping modulating signals q are input into the pre-compensation module to carry out pre-compensation processing to obtain compensating signals a of each subcarrier, the compensating signals a are input into an IFFT module to carry out Fourier inversion and add a protection interval to obtain compensating OFDM waveforms x (n), then the compensating OFDM waveforms x (n) are input into a zero intermediate frequency transmitter to obtain target radio frequency waveforms s (t), when the target radio frequency waveforms s (t) are used for representing that IQ imbalance does not occur, the target radio frequency waveforms s (t) are transmitted, and the modulating signals b are continuously received; when the target radio frequency waveform s (t) is used for representing that the IQ imbalance occurs in the zero intermediate frequency transmitter, the compensating operation is performed on the IQ imbalance through the compensating coefficient estimation module, namely, a switch between the precompensation module and the grouping mapping module is cut off, the switch is made to one end of the compensating coefficient estimation module, so that the precompensation module is communicated with the compensating coefficient estimation module, the compensating coefficient estimation module sequentially outputs carriers for performing the IQ imbalance compensating operation, each carrier is input into the precompensation module, precompensation coefficients are obtained through combining, precompensation signals are obtained, precompensation signals are input into the IFFT module, fourier transform is performed on the precompensation signals, and a guard interval is added, so that precompensation OFDM waveforms x (n) are obtained, then the precompensation OFDM waveforms x (n) are input into the zero intermediate frequency transmitter, so that radio frequency waveforms are obtained, then, a radio frequency waveform formed by taking the tail end point of a cyclic prefix in the radio frequency waveforms as a waveform starting point is obtained as a Fourier transform window of the carrier, the carrier is simplified in the Fourier transform window, the image carrier of the carrier is obtained, the precompensation signal of the carrier is combined, the precompensation signals of the carrier are obtained, the precompensation coefficients of the image carrier are further obtained, the target compensation coefficients of the carrier are obtained, and the precompensation signals of the carrier are carried out until all the target carrier coefficients are obtained.
Therefore, when the wideband IQ imbalance compensation device described in fig. 6 is implemented, it can intercept the radio frequency waveform by taking the end point of the cyclic prefix in the radio frequency waveform as the waveform starting point to form a fourier transform window, and acquire the compensation parameters of the carrier, so that the wideband IQ imbalance compensation device can be suitable for an OFDM system, and acquire the compensation coefficients of the carrier by combining the fourier transform window and a search algorithm, and can compensate for amplitude imbalance, phase imbalance, filtering imbalance and delay imbalance at the same time, and has high compensation accuracy, so that the problem of ISI is not brought, and CP resources are fully utilized.
Example six
The embodiment of the invention discloses a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program causes a computer to execute the steps of the method for compensating for broadband IQ imbalance described in the first or second embodiment.
Example seven
The embodiments of the present invention disclose a computer program product comprising a non-transitory computer readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform the steps of the wideband IQ imbalance compensation method described in embodiment one or embodiment two.
The apparatus embodiments described above are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above detailed description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product that may be stored in a computer-readable storage medium including Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic disc Memory, tape Memory, or any other medium that can be used for computer-readable carrying or storing data.
Finally, it should be noted that: the embodiment of the invention discloses a wideband IQ imbalance compensation method and device, which are disclosed by the embodiment of the invention only for illustrating the technical scheme of the invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme recorded in the various embodiments can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A method for compensating for broadband IQ imbalance, the method comprising:
when judging that IQ imbalance compensation operation needs to be executed on a carrier system, acquiring a target carrier for executing the IQ imbalance compensation operation on the carrier system;
acquiring a radio frequency waveform of the target carrier, and intercepting a target radio frequency waveform from the radio frequency waveform as a Fourier transform window of the target carrier, wherein the target radio frequency waveform is a radio frequency waveform formed by taking an end point of a cyclic prefix in the radio frequency waveform as a waveform starting point;
Analyzing the target carrier based on the Fourier transform window to obtain a mirror carrier of the target carrier, and determining a target compensation coefficient of the mirror carrier of the target carrier based on a search algorithm, wherein the target compensation coefficient is used for compensating IQ imbalance of the carrier system, and the search algorithm comprises one or more of breadth-first search BFS, depth-first search DFS, hill-Climbing Hill-Climbing, best-first algorithm Best-first search strategy, backtracking, branch-and-boundary algorithm Branch-and-bound Search Algorithm and A-th algorithm.
2. The method for compensating for wideband IQ imbalance according to claim 1 wherein said obtaining a radio frequency waveform of the target carrier comprises:
performing precompensation operation on the target carrier according to the determined precompensation coefficient to obtain precompensation signals, and performing inverse Fourier transform operation and guard interval operation on the precompensation signals to obtain precompensation OFDM waveforms;
and inputting the precompensated OFDM waveform into zero intermediate frequency transmitting equipment for analysis to obtain a radio frequency waveform.
3. The method for compensating for broadband IQ imbalance according to claim 2 wherein the determining the target compensation coefficient for the mirror carrier of the target carrier based on the search algorithm comprises:
Respectively acquiring a signal of the target carrier at a first frequency point and a signal of the mirror image carrier of the target carrier at a second frequency point;
and determining a target compensation coefficient of the mirror image carrier of the target carrier according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the mirror image carrier of the target carrier at the second frequency point.
4. A method of compensating for wideband IQ imbalance according to claim 2 or 3 wherein the number of target carriers is greater than 1;
and the calculation formula of the pre-compensation operation is as follows:
wherein a is k A compensation signal representing the kth target carrier, k representing the number of the target carrier, q k Representing the modulated signal on the kth said target carrier, p k Representing a preset compensation coefficient corresponding to the kth target carrier,and the conjugate carrier of the mirror carrier of the kth target carrier.
5. The method for compensating for broadband IQ imbalance according to claim 3 wherein said determining a target compensation coefficient for the image carrier of the target carrier based on the compensation signal for the target carrier and the signal of the target carrier at the first frequency point and the signal of the image carrier of the target carrier at the second frequency point comprises:
And determining the image interference power of the image carrier of the target carrier according to the compensation signal of the target carrier, the signal of the target carrier at the first frequency point and the signal of the image carrier of the target carrier at the second frequency point, and determining the target compensation coefficient of the image carrier of the target carrier according to the image interference power of the image carrier.
6. The method for compensating for wideband IQ imbalance according to claim 1, 2, 3 or 5 wherein the number of target carriers is greater than 1, each of the mirror carriers of the target carriers having a corresponding target compensation coefficient;
and after the determining the target compensation coefficient of the mirror carrier of the target carrier based on the search algorithm, the method further includes:
judging whether the number of target compensation coefficients in all the target compensation coefficients is larger than or equal to a preset compensation coefficient is larger than or equal to a determined number threshold, and when the number is smaller than the number threshold, re-triggering and executing the operation of acquiring the target carrier for executing the IQ imbalance compensation operation on the carrier system until the number is larger than or equal to the number threshold.
7. The method of compensating for wideband IQ imbalance according to claim 1, 2, 3 or 5 further comprising:
When the carrier system is in a working state, judging whether the radio frequency waveform generated by the zero intermediate frequency transmitting equipment of the carrier system generates IQ imbalance, and when the judgment result is yes, determining that IQ imbalance compensation operation is required to be executed on the carrier system;
judging whether the carrier system is converted from a non-working state to a working state, and determining that IQ imbalance compensation operation is required to be executed on the carrier system when the judging result is yes;
judging whether an IQ imbalance compensation request aiming at the carrier system is received, and determining that IQ imbalance compensation operation is required to be executed on the carrier system when the judgment result is yes.
8. A wideband IQ imbalance compensation apparatus, the apparatus comprising:
an acquisition module, configured to acquire a target carrier for performing an IQ-imbalance compensation operation on a carrier system when it is determined that the IQ-imbalance compensation operation is required to be performed on the carrier system;
the acquisition module is further used for acquiring the radio frequency waveform of the target carrier;
the intercepting module is used for intercepting a target radio frequency waveform from the radio frequency waveform, and taking the target radio frequency waveform as a Fourier transform window of the target carrier, wherein the target radio frequency waveform is a radio frequency waveform formed by taking the tail end point of a cyclic prefix in the radio frequency waveform as a waveform starting point;
The analysis module is used for analyzing the target carrier based on the Fourier transform window to obtain a mirror image carrier of the target carrier;
the determining module is configured to determine a target compensation coefficient of a mirror carrier of the target carrier, where the target compensation coefficient is used to compensate IQ imbalance of the carrier system, based on a search algorithm, where the search algorithm includes one or more of breadth-first search BFS, depth-first search DFS, hill-climbing hilling, best-first algorithm Best-first search strategy, backtracking, branch-and-bound algorithm Branch-and-bound Search Algorithm, and an a-algorithm.
9. A wideband IQ imbalance compensation apparatus, the apparatus comprising:
a memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to perform the wideband IQ imbalance compensation method according to any of claims 1-7.
10. A computer storage medium storing computer instructions which, when invoked, are adapted to perform the method of compensating for wideband IQ imbalance according to any of claims 1-7.
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| CN116938243B (en) * | 2023-09-15 | 2023-12-22 | 成都中创锐科信息技术有限公司 | Broadband channel amplitude and phase response correction method based on digital predistortion |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1973505A (en) * | 2004-07-16 | 2007-05-30 | 富士通株式会社 | Frequency domain equalization method and device in single-carrier receiver |
| US7274750B1 (en) * | 2002-09-27 | 2007-09-25 | 3Com Corporation | Gain and phase imbalance compensation for OFDM systems |
| CN102474284A (en) * | 2009-06-30 | 2012-05-23 | 阿尔卡特朗讯 | Method and apparatus for compensating for transceiver impairments |
| WO2018045764A1 (en) * | 2016-09-12 | 2018-03-15 | 深圳市中兴微电子技术有限公司 | Compensation method and apparatus, time domain compensator, communication device and storage medium |
| CN109861940A (en) * | 2018-12-29 | 2019-06-07 | 中国电子科技集团公司第二十研究所 | A kind of broadband signal IQ imbalance blind estimate and precompensation method |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1793551B1 (en) * | 2005-12-02 | 2009-06-17 | Interuniversitair Microelektronica Centrum Vzw | Method for estimating and compensating carrier frequency offset and I/Q imbalance |
| US8433014B2 (en) * | 2007-02-15 | 2013-04-30 | Mitsubishi Electric Corporation | Receiving apparatus and receiving method |
| US9148328B2 (en) * | 2010-10-29 | 2015-09-29 | Samsung Electronics Co., Ltd. | Digital I/Q imbalance compensation in a quadrature receiver |
| US8548096B2 (en) * | 2010-12-31 | 2013-10-01 | Telefonaktiebolaget L M Ericsson (Publ) | Controllable frequency offset for inphase and Quadrature (IQ) imbalance estimation |
| CN103051584B (en) * | 2013-01-18 | 2015-03-11 | 北京科技大学 | Blind carrier frequency offset estimation method of I/O (Input/Output) unbalance in OFDM (Orthogonal Frequency Division Multiplexing) system |
| CN104980377B (en) * | 2014-04-03 | 2018-11-16 | 华为技术有限公司 | A kind of equipment, the system and method for IQ unbalanced estimation and correction |
| CN103986686A (en) * | 2014-06-05 | 2014-08-13 | 北京科技大学 | Blind estimation method for carrier frequency offset, direct current offset and I/Q imbalance |
| CN108023702A (en) * | 2016-11-04 | 2018-05-11 | 维沃移动通信有限公司 | Data transmission method and device in a kind of cordless communication network |
| US10700910B2 (en) * | 2017-06-16 | 2020-06-30 | Qualcomm Incorporated | Single carrier waveform data transmission and reception based on configurable DFT window |
| CN111934694B (en) * | 2020-07-08 | 2022-03-15 | 电子科技大学 | Distortion compensation device of broadband zero intermediate frequency transceiving system |
-
2020
- 2020-09-21 CN CN202010998099.4A patent/CN114257253B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7274750B1 (en) * | 2002-09-27 | 2007-09-25 | 3Com Corporation | Gain and phase imbalance compensation for OFDM systems |
| CN1973505A (en) * | 2004-07-16 | 2007-05-30 | 富士通株式会社 | Frequency domain equalization method and device in single-carrier receiver |
| CN102474284A (en) * | 2009-06-30 | 2012-05-23 | 阿尔卡特朗讯 | Method and apparatus for compensating for transceiver impairments |
| WO2018045764A1 (en) * | 2016-09-12 | 2018-03-15 | 深圳市中兴微电子技术有限公司 | Compensation method and apparatus, time domain compensator, communication device and storage medium |
| CN109861940A (en) * | 2018-12-29 | 2019-06-07 | 中国电子科技集团公司第二十研究所 | A kind of broadband signal IQ imbalance blind estimate and precompensation method |
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