CN113556303B - IQ compensation method and device for single carrier transceiver and single carrier transceiver - Google Patents
IQ compensation method and device for single carrier transceiver and single carrier transceiver Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
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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
- H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
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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
- H04L27/38—Demodulator circuits; Receiver circuits
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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
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Abstract
The application belongs to the field of terminal equipment, and provides an IQ compensation method of a single carrier transceiver, which comprises the following steps: acquiring an initial IQ imbalance value after factory calibration and IQ imbalance estimation; determining a current IQ compensation path according to the current receiving signal-to-noise ratio and the current transmitting modulation order; IQ compensation is performed based on the current IQ compensation path and the initial IQ imbalance value. The scheme adopts a mechanism combining channel monitoring and simplified pre-compensation with pre-compensation to perform IQ imbalance time domain compensation of the transmitter. When the channel condition is good, the power consumption can be effectively reduced by adopting a simplified pre-compensation mechanism.
Description
Technical Field
The present application relates to the field of terminal devices, and in particular, to an IQ compensation method and apparatus for a single carrier transceiver, and a single carrier transceiver.
Background
Ideally, the amplitude and phase information of the modulated IQ two-way signal should be matched, the amplitudes should be consistent, and the phases should be 90 degrees apart. However, in an actual communication system, due to physical limitation of circuit hardware and unavoidable design errors in circuit design, there is a phenomenon that the amplitude and phase of two signals are not matched, i.e. IQ imbalance, which greatly reduces the error performance of the receiving system.
In the existing transmitter IQ imbalance time domain compensation, IQ imbalance compensation is generally performed on each data in a data transmission link, and this way, power consumption is excessive.
Disclosure of Invention
The present application provides an IQ compensation method and apparatus for a single carrier transceiver, and a single carrier transceiver, which solve the above-mentioned problems. The technical scheme provided by the application is as follows:
an IQ compensation method for a single carrier transceiver, comprising the steps of:
acquiring an initial IQ imbalance value after factory calibration and IQ imbalance estimation;
determining a current IQ compensation path according to the current receiving signal-to-noise ratio and the current transmitting modulation order;
IQ compensation is performed based on the current IQ compensation path and the initial IQ imbalance value.
Further preferably, the determining the current IQ compensation path according to the current received signal-to-noise ratio and the current transmission modulation order comprises the steps of:
according to the current receiving signal-to-noise ratio, calculating the average value of the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
wherein, SNR_m is the average value of the current received signal-to-noise ratio, K is the number of subframes currently received;
before switching from a receiving state to a transmitting state, determining the current IQ compensation path according to the current receiving signal-to-noise ratio average value and the current transmitting modulation order;
wherein the current IQ compensation path comprises a software compensation path and a hardware compensation path.
Further preferably, before switching from the receiving state to the transmitting state, the determining the current IQ compensation path according to the current average value of the received signal-to-noise ratio and the current modulation order comprises the steps of:
when the current signal-to-noise ratio average value is larger than a signal-to-noise ratio threshold value and the current transmission modulation order is low-order modulation, determining the current IQ compensation path as the software compensation path;
and when the current signal-to-noise ratio average value is smaller than a signal-to-noise ratio threshold value and the current transmission modulation order is low-order modulation, determining the current IQ compensation path as the hardware compensation path.
Further preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
IQ compensation is performed by using the software compensation path and the initial IQ imbalance value, and the IQ compensation method specifically comprises the following steps: the modulation constellation points generate IQ imbalance compensation parameters, and the IQ imbalance compensation parameters are saved for IQ compensation.
Further preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
IQ compensation is performed by using the hardware compensation path and the initial IQ imbalance value, and the IQ compensation method specifically comprises the following steps: and performing IQ compensation through a calibrator according to the IQ imbalance compensation parameters corresponding to the initial IQ imbalance value.
Further preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
inputting the initial IQ imbalance value and IQ imbalance compensation parameter to perform IQ compensation, and outputting a compensated signal, wherein the calculation formula is as follows:
y_I＝x_I；
y_Q＝a_I_m*x_Q+alpha_m*x_I；
wherein a_I_m is an amplitude imbalance compensation parameter, alpha_m is a phase imbalance compensation parameter, x_I is an I-path input signal, y_I is an I-path output signal, x_Q is a Q-path input signal, and y_Q is a Q-path output signal.
An IQ compensation apparatus for a single carrier transceiver, comprising:
the acquisition module is used for acquiring an initial IQ imbalance value after the IQ imbalance estimation is carried out in factory calibration;
the determining module is used for determining a current IQ compensation path according to the current receiving signal-to-noise ratio and the current transmitting modulation order;
and the compensation module is used for carrying out IQ compensation based on the current IQ compensation path and the initial IQ imbalance value.
Further preferably, the determining module is further configured to:
according to the current receiving signal-to-noise ratio, calculating the average value of the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
wherein, SNR_m is the average value of the current received signal-to-noise ratio, K is the number of subframes currently received;
before switching from a receiving state to a transmitting state, determining the current IQ compensation path according to the current receiving signal-to-noise ratio average value and the current transmitting modulation order;
wherein the current IQ compensation path comprises a software compensation path and a hardware compensation path.
Further preferably, the determining module is further configured to:
when the current signal-to-noise ratio average value is larger than a signal-to-noise ratio threshold value and the current transmission modulation order is low-order modulation, determining the current IQ compensation path as the software compensation path;
and when the current signal-to-noise ratio average value is smaller than a signal-to-noise ratio threshold value and the current transmission modulation order is low-order modulation, determining the current IQ compensation path as the hardware compensation path.
A single carrier transceiver comprising IQ compensation means for said single carrier transceiver.
The IQ compensation method and device for the single-carrier transceiver and the single-carrier transceiver provided by the application have the following beneficial effects:
1) The scheme of the application adopts a mechanism combining channel monitoring with simplified pre-compensation and pre-compensation to perform IQ imbalance time domain compensation of the transmitter.
2) When the channel condition is good, the power consumption can be effectively reduced by adopting a simplified pre-compensation mechanism.
Drawings
The application is described in further detail below with reference to the attached drawings and detailed description:
fig. 1 is a flow chart of an embodiment of an IQ compensation method for a single carrier transceiver according to the present application;
fig. 2 is a flow chart of another embodiment of an IQ compensation method for a single carrier transceiver according to the present application;
FIG. 3 is a logic diagram of calibration compensation in the present application;
fig. 4 is a flow chart of an embodiment of an IQ compensation apparatus for a single carrier transceiver according to the present application.
Detailed Description
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
For the sake of simplicity of the drawing, the parts relevant to the present application are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will explain the specific embodiments of the present application with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the application, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
Example 1
As shown in fig. 1, the present application provides an IQ compensation method for a single carrier transceiver, comprising the steps of:
s100, acquiring an initial IQ imbalance value after factory calibration and IQ imbalance estimation.
S200, determining a current IQ compensation path according to the current receiving signal-to-noise ratio and the current transmitting modulation order.
S300, IQ compensation is performed based on the current IQ compensation path and the initial IQ imbalance value.
Exemplary, as shown in fig. 2, a simplified system and method for IQ imbalance compensation for a single carrier transmitter. The IQ imbalance correction method is mainly used for IQ imbalance correction of the TDD zero intermediate frequency single carrier transceiver, and comprises the following parts: the calibrator, the channel detection, the concrete step is as follows:
s1, when the transceiver is calibrated in a factory, IQ imbalance estimation is carried out (the default I path is unchanged, the imbalance of the amplitude and the phase is mainly in the Q path), imbalance values a_I and a_Q of the amplitude and the phase are respectively obtained, and the imbalance values a_I and a_Q are stored in a register.
S2, when the system is in a receiving state, reporting the current SNR to the software.
S201, the software obtains an average value of the SNR in the current receiving state according to the reported SNR. Let snr_m= (SNR (1) + … +snr (k))/k be currently received for k subframes.
S202, before receiving and transmitting switching, judging an IQ compensation mode of current transmission according to SNR_m and the modulation order of current transmission, and if SNR_m > SNR_thr and low-order modulation is performed (modulation order mode_type < thr), storing the compensation mode in a register 2 as a software compensation constellation point. Otherwise, the hardware compensation mode compensates at the transmitting channel.
S3, according to the compensation mode output by the S2, IQ imbalance compensation is performed by using the compensation value in the register 1.
S301, in a software compensation mode, IQ imbalance compensation is firstly carried out on constellation points which can be matched by software, compensated data are placed in a register 2, and the constellation points which are compensated in the register 2 are used in transmitting modulation. A calibrator in the Bypass hardware data path.
And S302, in the hardware compensation mode, when the DFE digital channel is close to the RF position, IQ imbalance compensation is carried out through a calibrator. The software does not compensate for the constellation points at this time.
S303, the calculation formulas of the two compensation are identical, and the calculation formulas are as follows:
output signal y, input signal x, amplitude imbalance compensation parameter a_i_m, phase imbalance compensation parameter alpha_m:
y_I＝x_I。
y_Q＝a_I_m*x_Q+alpha_m*x_I。
s4, directly outputting the calibrated data.
In this embodiment, the IQ imbalance can be calibrated and compensated by selecting hardware compensation or software compensation, thereby meeting the actual requirements of high accuracy or low power consumption.
Example two
Based on the foregoing embodiments, the same parts as those of the foregoing embodiments will not be described in detail in this embodiment, and this embodiment provides an IQ compensation method of a single carrier transceiver, which specifically includes:
the determining the current IQ compensation path according to the current receiving signal-to-noise ratio and the current transmitting modulation order comprises the following steps:
according to the current receiving signal-to-noise ratio, calculating the average value of the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
wherein, SNR_m is the average value of the current received signal-to-noise ratio, K is the number of subframes currently received;
before switching from a receiving state to a transmitting state, determining the current IQ compensation path according to the current receiving signal-to-noise ratio average value and the current transmitting modulation order;
wherein the current IQ compensation path comprises a software compensation path and a hardware compensation path.
Preferably, before switching from the receiving state to the transmitting state, the determining the current IQ compensation path according to the current average value of the received signal-to-noise ratio and the current modulation order comprises the steps of:
and when the current signal-to-noise ratio average value is larger than a signal-to-noise ratio threshold value and the current transmission modulation order is low-order modulation, determining the current IQ compensation path as the software compensation path.
Preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
IQ compensation is performed by using the software compensation path and the initial IQ imbalance value, and the IQ compensation method specifically comprises the following steps: the modulation constellation points generate IQ imbalance compensation parameters, and the IQ imbalance compensation parameters are saved for IQ compensation.
Preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
inputting the initial IQ imbalance value and IQ imbalance compensation parameter to perform IQ compensation, and outputting a compensated signal, wherein the calculation formula is as follows:
y_I＝x_I；
y_Q＝a_I_m*x_Q+alpha_m*x_I；
wherein a_I_m is an amplitude imbalance compensation parameter, alpha_m is a phase imbalance compensation parameter, x_I is an I-path input signal, y_I is an I-path output signal, x_Q is a Q-path input signal, and y_Q is a Q-path output signal.
For example, as shown in fig. 3, for a single carrier transceiver, the receiving state is about to be shifted to the transmitting state, and at this time, it is detected that: thr=6; snr_thr=25, the current detection results in snr_m=26, the modulation order to be transmitted is mode_type=4, comprising the steps of:
s1, when the transceiver is calibrated in a factory, imbalance values a_I and a_Q of amplitude and phase are obtained and stored in a register.
S2, when the system is in a receiving state, reporting the current SNR to the software.
S201, the software obtains an average value of the SNR in the current receiving state according to the reported SNR. Snr_m=26.
S202, according to SNR_m and the modulation order of the current transmission, SNR_m > SNR_thr, and low-order modulation (modulation order mode_type < thr), the compensation mode is that the software compensation constellation point is stored in a register 2.
S3, performing IQ imbalance compensation by using the compensation value in the register 1 in a software compensation mode.
S301, in a software compensation mode, IQ imbalance compensation is firstly carried out on constellation points which can be matched by software, compensated data are placed in a register 2, and the constellation points which are compensated in the register 2 are used in transmitting modulation. A calibrator in the Bypass hardware data path.
The calculation formula of the compensation is consistent as follows:
output signal y, input signal x, amplitude imbalance compensation parameter a_i_m, phase imbalance compensation parameter alpha_m:
y_I＝x_I。
y_Q＝a_I_m*x_Q+alpha_m*x_I。
s4, directly outputting the calibrated data.
Specifically, although the data to be transmitted may be 1110, there is a certain error, which leads to erroneous judgment of the constellation, and the modulation becomes 1111, so that the direct transmission cannot be taken out, and IQ imbalance compensation is required.
Specifically, the data to be transmitted after the modulation of the binary bit 10 is transmitted may be a, but the data to be transmitted becomes a/b after IQ imbalance, which may cause errors in the data to be transmitted, and thus the receiver cannot correctly receive the data. IQ imbalance pre-compensation is required.
One method is software correction, in which the star point corresponding to 10 is changed to a×b by software, and the data transmitted after modulation through IQ imbalance is changed to (a×b)/b=a. Yet another is through a later hardware calibrator. The originally modulated IQ may be misjudged and pre-compensated by software to repair the signal.
In this embodiment, the software compensation does not modify the signal, and modulates the emission by pre-compensating the modulating star landing point, so as to achieve the effect of compensating IQ imbalance, which belongs to passive compensation.
Example III
Based on the foregoing embodiments, the same parts as those of the foregoing embodiments will not be described in detail in this embodiment, and this embodiment provides an IQ compensation method of a single carrier transceiver, which specifically includes:
preferably, before switching from the receiving state to the transmitting state, the determining the current IQ compensation path according to the current average value of the received signal-to-noise ratio and the current modulation order comprises the steps of:
and when the current signal-to-noise ratio average value is smaller than a signal-to-noise ratio threshold value and the current transmission modulation order is low-order modulation, determining the current IQ compensation path as the hardware compensation path.
Preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
IQ compensation is performed by using the hardware compensation path and the initial IQ imbalance value, and the IQ compensation method specifically comprises the following steps: and performing IQ compensation through a calibrator according to the IQ imbalance compensation parameters corresponding to the initial IQ imbalance value.
Preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
inputting the initial IQ imbalance value and IQ imbalance compensation parameter to perform IQ compensation, and outputting a compensated signal, wherein the calculation formula is as follows:
y_I＝x_I；
y_Q＝a_I_m*x_Q+alpha_m*x_I；
wherein a_I_m is an amplitude imbalance compensation parameter, alpha_m is a phase imbalance compensation parameter, x_I is an I-path input signal, y_I is an I-path output signal, x_Q is a Q-path input signal, and y_Q is a Q-path output signal.
For example, as shown in fig. 3, for a single carrier transceiver, the receiving state is about to be shifted to the transmitting state, and at this time, it is detected that: thr=6; snr_thr=25, the current detection yields snr_m=20, the modulation order to be transmitted is mode_type=4:
s1, when the transceiver is calibrated in a factory, imbalance values a_I and a_Q of amplitude and phase are obtained and stored in a register.
S2, when the system is in a receiving state, reporting the current SNR to the software.
S201, the software obtains an average value of the SNR in the current receiving state according to the reported SNR. Snr_m=26.
S202, according to snr_m and the modulation order of the current transmission, snr_m < snr_thr, and low-order modulation (modulation order mode_type < thr), the compensation mode is a hardware compensation mode, and the compensation is performed at the transmitting channel.
S3, performing hardware compensation, and performing IQ imbalance compensation by using the compensation value in the register 1.
S301, in a hardware compensation mode, IQ imbalance compensation is carried out through a calibrator when the DFE digital channel is close to the RF position. The software does not compensate for the constellation points at this time.
The calculation formula of the compensation is consistent as follows:
the output signal y, the input signal x, the amplitude imbalance compensation parameter a_I_m, the phase imbalance compensation parameter alpha_m, the calculation formula is:
y_I＝x_I；
y_Q＝a_I_m*x_Q+alpha_m*x_I；
in this embodiment, IQ imbalance compensation is performed by means of hardware compensation, wherein the hardware compensation is actively matched to a suitable frequency, which is equivalent to antenna modification, and the hardware compensation is to adjust the digital channel by means of a hardware calibrator, i.e. the hardware is a calibrator.
The above embodiment can directly compensate the initial IQ imbalance value by software and then store the same in a new register. Or alternatively, the calibration device is equivalent to a judgment standard for changing the constellation diagram without compensation. For example, 0.5 data may be judged as 0 or 1, and the calibrator changes the data to 0.6 or more to 1, so that 0.5 data is not misjudged.
Example IV
The application provides an IQ compensation device of a single carrier transceiver, comprising:
the acquisition module is used for acquiring initial IQ imbalance values after the factory calibration is carried out IQ imbalance estimation.
And the determining module is used for determining a current IQ compensation path according to the current receiving signal-to-noise ratio and the current transmitting modulation order.
And the compensation module is used for carrying out IQ compensation based on the current IQ compensation path and the initial IQ imbalance value.
Preferably, the determining module is further configured to:
according to the current receiving signal-to-noise ratio, calculating the average value of the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
wherein, SNR_m is the average value of the current received signal-to-noise ratio, K is the number of subframes currently received;
before switching from a receiving state to a transmitting state, determining the current IQ compensation path according to the current receiving signal-to-noise ratio average value and the current transmitting modulation order;
wherein the current IQ compensation path comprises a software compensation path and a hardware compensation path.
Preferably, the determining module is further configured to:
when the current signal-to-noise ratio average value is larger than a signal-to-noise ratio threshold value and the current transmission modulation order is low-order modulation, determining the current IQ compensation path as the software compensation path;
and when the current signal-to-noise ratio average value is smaller than a signal-to-noise ratio threshold value and the current transmission modulation order is low-order modulation, determining the current IQ compensation path as the hardware compensation path.
As shown in fig. 4, the present embodiment provides an IQ imbalance compensation system, which is mainly used for IQ imbalance correction of a TDD zero intermediate frequency single carrier transceiver, and includes the following parts: the calibrator, channel detection, the system can perform the specific steps as follows:
s1, when the transceiver is calibrated in a factory, IQ imbalance estimation is carried out (the default I path is unchanged, the imbalance of the amplitude and the phase is mainly in the Q path), imbalance values a_I and a_Q of the amplitude and the phase are respectively obtained, and the imbalance values a_I and a_Q are stored in a register.
S2, when the system is in a receiving state, reporting the current SNR to the software.
S201, the software obtains an average value of the SNR in the current receiving state according to the reported SNR. Let snr_m= (SNR (1) + … +snr (k))/k be currently received for k subframes.
S202, before receiving and transmitting switching, judging an IQ compensation mode of current transmission according to SNR_m and the modulation order of current transmission, and if SNR_m > SNR_thr and low-order modulation is performed (modulation order mode_type < thr), storing the compensation mode in a register 2 as a software compensation constellation point. Otherwise, the hardware compensation mode compensates at the transmitting channel.
S3, according to the compensation mode output by the S2, IQ imbalance compensation is performed by using the compensation value in the register 1.
S301, in a software compensation mode, IQ imbalance compensation is firstly carried out on constellation points which can be matched by software, compensated data are placed in a register 2, and the constellation points which are compensated in the register 2 are used in transmitting modulation. A calibrator in the Bypass hardware data path.
And S302, in the hardware compensation mode, when the DFE digital channel is close to the RF position, IQ imbalance compensation is carried out through a calibrator. The software does not compensate for the constellation points at this time.
S303, the calculation formulas of the two compensation are identical, and the calculation formulas are as follows:
output signal y, input signal x, amplitude imbalance compensation parameter a_i_m, phase imbalance compensation parameter alpha_m:
y_I＝x_I。
y_Q＝a_I_m*x_Q+alpha_m*x_I。
s4, directly outputting the calibrated data.
In this embodiment, the IQ imbalance time-domain compensation of the transmitter is performed by using a mechanism combining channel monitoring and simplified pre-compensation. When the channel condition is good, the power consumption can be effectively reduced by adopting a simplified pre-compensation mechanism.
Example five
The application also provides a single carrier transceiver, which comprises the IQ compensation device of the single carrier transceiver.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The system embodiments described above are exemplary only, and exemplary, the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, exemplary, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (8)
1. An IQ compensation method for a single carrier transceiver, comprising the steps of:
acquiring an initial IQ imbalance value after factory calibration and IQ imbalance estimation;
determining a current IQ compensation path according to the current receiving signal-to-noise ratio and the current transmitting modulation order; the method specifically comprises the following steps:
before switching from a receiving state to a transmitting state, determining the current IQ compensation path according to the current receiving signal-to-noise ratio average value and the current transmitting modulation order; the current IQ compensation path comprises a software compensation path and a hardware compensation path; the method specifically comprises the following steps:
when the current receiving signal-to-noise ratio average value is larger than a signal-to-noise ratio threshold value and the current transmitting modulation order is low-order modulation, determining the current IQ compensation path as the software compensation path;
when the current receiving signal-to-noise ratio average value is smaller than a signal-to-noise ratio threshold value and the current transmitting modulation order is low-order modulation, determining the current IQ compensation path as the hardware compensation path;
IQ compensation is performed based on the current IQ compensation path and the initial IQ imbalance value.
2. The IQ compensation method for a single carrier transceiver according to claim 1 wherein the determining a current IQ compensation path according to a current received signal-to-noise ratio and a current transmit modulation order comprises the steps of:
according to the current receiving signal-to-noise ratio, calculating the average value of the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m = (SNR(1)+…+ SNR(k))/k；
wherein snr_m is the average value of the current received signal-to-noise ratio, and K is the number of subframes currently received.
3. The IQ compensation method according to claim 2 wherein the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
IQ compensation is performed by using the software compensation path and the initial IQ imbalance value, and the IQ compensation method specifically comprises the following steps: the modulation constellation points generate IQ imbalance compensation parameters, and the IQ imbalance compensation parameters are saved for IQ compensation.
4. The IQ compensation method according to claim 2 wherein the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
IQ compensation is performed by using the hardware compensation path and the initial IQ imbalance value, and the IQ compensation method specifically comprises the following steps: and performing IQ compensation through a calibrator according to the IQ imbalance compensation parameters corresponding to the initial IQ imbalance value.
5. The IQ compensation method according to claim 3 or 4 wherein the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
inputting the initial IQ imbalance value and IQ imbalance compensation parameter to perform IQ compensation, and outputting a compensated signal, wherein the calculation formula is as follows:
y_I = x_I；
；
wherein a_I_m is an amplitude imbalance compensation parameter, alpha_m is a phase imbalance compensation parameter, x_I is an I-path input signal, y_I is an I-path output signal, x_Q is a Q-path input signal, and y_Q is a Q-path output signal.
6. An IQ compensation apparatus for a single carrier transceiver comprising the steps of:
the acquisition module is used for acquiring an initial IQ imbalance value after the IQ imbalance estimation is carried out in factory calibration;
the determining module is used for determining a current IQ compensation path according to the current receiving signal-to-noise ratio and the current transmitting modulation order; the method specifically comprises the following steps: before switching from a receiving state to a transmitting state, determining the current IQ compensation path according to the current receiving signal-to-noise ratio average value and the current transmitting modulation order; the current IQ compensation path comprises a software compensation path and a hardware compensation path; the method specifically comprises the following steps:
when the current receiving signal-to-noise ratio average value is larger than a signal-to-noise ratio threshold value and the current transmitting modulation order is low-order modulation, determining the current IQ compensation path as the software compensation path;
when the current receiving signal-to-noise ratio average value is smaller than a signal-to-noise ratio threshold value and the current transmitting modulation order is low-order modulation, determining the current IQ compensation path as the hardware compensation path;
and the compensation module is used for carrying out IQ compensation based on the current IQ compensation path and the initial IQ imbalance value.
7. The IQ compensation apparatus of the single carrier transceiver of claim 6 wherein the determining module is further configured to:
according to the current receiving signal-to-noise ratio, calculating the average value of the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m = (SNR(1)+…+ SNR(k))/k；
wherein snr_m is the average value of the current received signal-to-noise ratio, and K is the number of subframes currently received.
8. A single carrier transceiver comprising the IQ compensation apparatus of any one of claims 6-7.
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| CN112887238A (en) * | 2021-05-06 | 2021-06-01 | 上海擎昆信息科技有限公司 | IQ imbalance correction method and device, and receiver |
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| US9749056B2 (en) * | 2015-01-14 | 2017-08-29 | Huawei Technologies Co., Ltd | Method and system for discrete multi-tone transmission with multiple modulations |
| US20160323010A1 (en) * | 2015-04-28 | 2016-11-03 | Nokia Technologies Oy | Methods and apparatus for mitigation of radio-frequency impairments in wireless network communication |
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| CN112887238A (en) * | 2021-05-06 | 2021-06-01 | 上海擎昆信息科技有限公司 | IQ imbalance correction method and device, and receiver |
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