CN113556303A - IQ compensation method and device of single carrier transceiver and single carrier transceiver - Google Patents

IQ compensation method and device of single carrier transceiver and single carrier transceiver Download PDF

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CN113556303A
CN113556303A CN202110815187.0A CN202110815187A CN113556303A CN 113556303 A CN113556303 A CN 113556303A CN 202110815187 A CN202110815187 A CN 202110815187A CN 113556303 A CN113556303 A CN 113556303A
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compensation
current
imbalance
path
noise ratio
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CN113556303B (en
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谭定富
武传国
唐兵
是元吉
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Shanghai Qingkun Information Technology Co Ltd
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Shanghai Qingkun Information Technology Co Ltd
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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
    • 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
    • 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
    • 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

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

The invention 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 IQ imbalance estimation of factory calibration; determining a current IQ compensation path according to a current receiving signal-to-noise ratio and a current transmitting modulation order; and performing IQ compensation based on the current IQ compensation path and the initial IQ imbalance value. The scheme adopts a mechanism combining channel monitoring, simplified pre-compensation and pre-compensation to carry out IQ imbalance time domain compensation of the transmitter. When the channel condition is better, a simplified precompensation mechanism is adopted, so that the power consumption can be effectively reduced.

Description

IQ compensation method and device of single carrier transceiver and single carrier transceiver
Technical Field
The present invention 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-path signals should be matched, the amplitudes should be consistent, and the phases should differ by 90 degrees. However, in an actual communication system, due to physical limitations of circuit hardware and inevitable design errors in circuit design, the phenomenon that the amplitudes and phases of two paths of signals are not matched, that is, IQ imbalance, can greatly reduce the error code performance of a receiving system.
In the existing transmitter IQ imbalance time domain compensation, generally, IQ imbalance compensation is performed on each data in a data transmission link, and this way may result in excessive power consumption.
Disclosure of Invention
The invention provides an IQ compensation method and device of a single carrier transceiver and the single carrier transceiver, which solve the problems. The technical scheme provided by the invention is as follows:
an IQ compensation method for a single carrier transceiver, comprising the steps of:
acquiring an initial IQ imbalance value after IQ imbalance estimation of factory calibration;
determining a current IQ compensation path according to a current receiving signal-to-noise ratio and a current transmitting modulation order;
and performing IQ compensation based on the current IQ compensation path and the initial IQ imbalance value.
Further preferably, the determining a current IQ compensation path according to the current received signal-to-noise ratio and the current transmission modulation order includes:
calculating the average value of the current receiving signal-to-noise ratio according to the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
the SNR _ m is the average value of the current receiving signal-to-noise ratio, and K is the number of the currently received subframes;
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, determining the current IQ compensation path according to the current receiving signal-to-noise ratio average value and the current transmission modulation order, includes:
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 includes the steps of:
performing IQ compensation by using the software compensation path and the initial IQ imbalance value, specifically comprising: and modulating the constellation points to generate IQ imbalance compensation parameters, and storing the IQ imbalance compensation parameters for IQ compensation.
Further preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value includes the steps of:
performing IQ compensation by using the hardware compensation path and the initial IQ imbalance value, specifically comprising: and performing IQ compensation through a calibrator according to IQ imbalance compensation parameters corresponding to the initial IQ imbalance values.
Further preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value includes the steps of:
inputting the initial IQ imbalance value and IQ imbalance compensation parameters to carry out 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:
an obtaining module, configured to obtain an initial IQ imbalance value after IQ imbalance estimation in factory calibration;
the determining module is used for determining a current IQ compensation path according to a current receiving signal-to-noise ratio and a 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:
calculating the average value of the current receiving signal-to-noise ratio according to the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
the SNR _ m is the average value of the current receiving signal-to-noise ratio, and K is the number of the currently received subframes;
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 includes IQ compensation means of the single carrier transceiver.
The IQ compensation method and device of the single carrier transceiver and the single carrier transceiver provided by the invention at least have the following beneficial effects:
1) the scheme of the invention adopts a mechanism combining channel monitoring, simplified pre-compensation and pre-compensation to carry out IQ imbalance time domain compensation of the transmitter.
2) When the channel condition is better, a simplified precompensation mechanism is adopted, so that the power consumption can be effectively reduced.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
fig. 1 is a schematic flowchart of an embodiment of an IQ compensation method for a single carrier transceiver according to the present invention;
fig. 2 is a flowchart illustrating an IQ compensation method for a single carrier transceiver according to another embodiment of the present invention;
FIG. 3 is a logic diagram of calibration compensation in the present invention;
fig. 4 is a flowchart illustrating an IQ compensation apparatus for a single carrier transceiver according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In this context, it is to be understood that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example one
As shown in fig. 1, the present invention provides an IQ compensation method for a single carrier transceiver, comprising the steps of:
s100, an initial IQ imbalance value after IQ imbalance estimation is carried out in factory calibration is obtained.
S200, determining the 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.
Illustratively, as shown in fig. 2, a simplified IQ imbalance compensation system and method for a single-carrier transmitter. The IQ imbalance correction method is mainly used for IQ imbalance correction of a TDD zero intermediate frequency single-carrier transceiver, and comprises the following parts: the method comprises the following steps of a calibrator and channel detection:
and S1, when the transceiver is calibrated off-site, IQ imbalance estimation is carried out (the I path is not changed by default, and the imbalance of the amplitude and the phase is mainly in the Q path), and the imbalance values a _ I and a _ Q of the amplitude and the phase are respectively obtained and stored in a register.
And S2, when the system is in a receiving state, reporting the current SNR to software.
S201, the software calculates the SNR average value in the current receiving state according to the reported SNR. Let us assume that k subframes are currently received, SNR _ m ═ SNR (1) + … + SNR (k))/k.
S202, before the transceiving switching, judging an IQ compensation mode of current transmission according to SNR _ m and a modulation order of the current transmission, if the SNR _ m is greater than SNR _ thr and the modulation order is low-order modulation (modulation order mode _ type < thr), storing the compensation mode in a register 2 as a software compensation constellation point. Otherwise, the hardware compensation mode is used for compensation at the transmitting channel.
S3, according to the compensation mode outputted by S2, IQ imbalance compensation is performed by using the compensation value in the register 1.
S301, when in a software compensation mode, IQ imbalance compensation is firstly carried out on constellation points which can be matched by software, the compensated data is placed in a register 2, and the constellation points compensated in the register 2 are used during transmission modulation. Calibrator in Bypass hardware data channel.
S302, in the hardware compensation mode, when the DFE digital channel is close to the RF position, the IQ is subjected to imbalance compensation through the calibrator. At this time, the software does not compensate for the constellation points.
S303, the calculation formulas of the two compensations are consistent as follows:
and outputting a signal y, wherein the input signal is x, the amplitude imbalance compensation parameter is a _ I _ m, and the phase imbalance compensation parameter is alpha _ m:
y_I＝x_I。
y_Q＝a_I_m*x_Q+alpha_m*x_I。
and S4, directly outputting the calibrated data.
In this embodiment, hardware compensation or software compensation may be selected to perform calibration compensation on IQ imbalance, which satisfies the actual requirements of high accuracy or low power consumption.
Example two
Based on the foregoing embodiment, parts of this embodiment that are the same as those of the foregoing embodiment are not repeated, and this embodiment provides an IQ compensation method for a single carrier transceiver, which specifically includes:
the method for 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:
calculating the average value of the current receiving signal-to-noise ratio according to the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
the SNR _ m is the average value of the current receiving signal-to-noise ratio, and K is the number of the currently received subframes;
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, determining the current IQ compensation path according to the current receiving signal-to-noise ratio average value and the current transmission modulation order, includes:
and when the current signal-to-noise ratio average value is greater 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 includes the steps of:
performing IQ compensation by using the software compensation path and the initial IQ imbalance value, specifically comprising: and modulating the constellation points to generate IQ imbalance compensation parameters, and storing the IQ imbalance compensation parameters for IQ compensation.
Preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value includes the steps of:
inputting the initial IQ imbalance value and IQ imbalance compensation parameters to carry out 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, which is now in a receiving state, it is about to transition to a transmitting state, and then it is detected that: thr is 6; the SNR _ thr is 25, the current detection result SNR _ m is 26, and the modulation order to be transmitted is mode _ type 4, which includes the following steps:
and S1, obtaining the unbalance values a _ I and a _ Q of the amplitude and the phase when the transceiver is subjected to factory calibration, and storing the unbalance values a _ I and a _ Q in a register.
And S2, when the system is in a receiving state, reporting the current SNR to software.
S201, the software calculates the SNR average value in the current receiving state according to the reported SNR. SNR _ m is 26.
S202, according to SNR _ m and the modulation order of the current transmission, SNR _ m > SNR _ thr, and the low-order modulation (modulation order mode _ type < thr), the compensation mode is that software compensation constellation points are stored in the register 2.
S3, software compensation, using the compensation value in register 1 to make IQ imbalance compensation.
S301, when in a software compensation mode, IQ imbalance compensation is firstly carried out on constellation points which can be matched by software, the compensated data is placed in a register 2, and the constellation points compensated in the register 2 are used during transmission modulation. Calibrator in Bypass hardware data channel.
The calculation formula for compensation is consistent as follows:
and outputting a signal y, wherein the input signal is x, the amplitude imbalance compensation parameter is a _ I _ m, and the phase imbalance compensation parameter is alpha _ m:
y_I＝x_I。
y_Q＝a_I_m*x_Q+alpha_m*x_I。
and S4, directly outputting the calibrated data.
Specifically, the data to be originally transmitted may be 1110, but there is a certain error, which causes misjudgment of the constellation diagram, and the modulated data becomes 1111, so that the data cannot be directly transmitted, and IQ imbalance compensation is required.
Specifically, the data to be transmitted after modulation of the binary bit 10 may be a, but becomes a/b after IQ imbalance, which may cause errors in the transmitted data, and thus cause the receiver to fail to receive correctly. IQ imbalance pre-compensation is required.
One method is software modification, in which the star point corresponding to 10 is changed to a b by software, and the data transmitted after modulation and IQ imbalance is changed to (a b)/b a. Yet another is through a later hardware calibrator. The otherwise modulated IQ may be misjudged and allowed to repair the signal by software pre-compensation.
In this embodiment, the software compensation does not modify the signal, and the signal is used for modulation transmission by pre-compensating the modulation satellite drop point, so as to achieve the effect of compensating IQ imbalance, and belong to passive compensation.
EXAMPLE III
Based on the foregoing embodiment, parts of this embodiment that are the same as those of the foregoing embodiment are not repeated, and this embodiment provides an IQ compensation method for a single carrier transceiver, which specifically includes:
preferably, before switching from the receiving state to the transmitting state, determining the current IQ compensation path according to the current receiving signal-to-noise ratio average value and the current transmission modulation order, includes:
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 includes the steps of:
performing IQ compensation by using the hardware compensation path and the initial IQ imbalance value, specifically comprising: and performing IQ compensation through a calibrator according to IQ imbalance compensation parameters corresponding to the initial IQ imbalance values.
Preferably, the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value includes the steps of:
inputting the initial IQ imbalance value and IQ imbalance compensation parameters to carry out 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, which is now in a receiving state, it is about to transition to a transmitting state, and then it is detected that: thr is 6; SNR _ thr is 25, SNR _ m is 20, modulation order to be transmitted is mode _ type 4:
and S1, obtaining the unbalance values a _ I and a _ Q of the amplitude and the phase when the transceiver is subjected to factory calibration, and storing the unbalance values a _ I and a _ Q in a register.
And S2, when the system is in a receiving state, reporting the current SNR to software.
S201, the software calculates the SNR average value in the current receiving state according to the reported SNR. SNR _ m is 26.
S202, according to the SNR _ m and the modulation order of the current transmission, the SNR _ m is less than SNR _ thr, and the low-order modulation (modulation order mode _ type is less than thr), the compensation mode is a hardware compensation mode, and the compensation is performed at the transmission channel.
S3, hardware compensation, using the compensation value in register 1 to make IQ imbalance compensation.
S301, in a hardware compensation mode, IQ is subjected to imbalance compensation through a calibrator at a position, close to the RF, of the DFE digital channel. At this time, the software does not compensate for the constellation points.
The calculation formula for compensation is consistent as follows:
the output signal y, the input signal is x, the amplitude imbalance compensation parameter is a _ I _ m, the phase imbalance compensation parameter is alpha _ m, and the calculation formula is as follows:
y_I＝x_I；
y_Q＝a_I_m*x_Q+alpha_m*x_I；
in this embodiment, IQ imbalance compensation is performed by hardware compensation, which is actively matched to a suitable frequency, which is equivalent to changing an antenna, and hardware compensation is to adjust a digital channel by using a hardware calibrator, i.e., the hardware is to change the calibrator.
The above embodiment can directly compensate the initial IQ imbalance value by software and then store the initial IQ imbalance value in a new register. Or not compensated, the calibrator is equivalent to changing the judgment standard of the constellation diagram. For example, the data of 0.5 may be judged to be 0 or 1, and the calibrator changes the data to be more than 0.6 to be 1, so that the data of 0.5 is not misjudged.
Example four
The invention provides an IQ compensation device of a single carrier transceiver, comprising:
and the acquisition module is used for acquiring an initial IQ imbalance value after IQ imbalance estimation is carried out on factory calibration.
And the determining module is used for determining the 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:
calculating the average value of the current receiving signal-to-noise ratio according to the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
the SNR _ m is the average value of the current receiving signal-to-noise ratio, and K is the number of the currently received subframes;
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.
Illustratively, as shown in fig. 4, the present embodiment provides an IQ imbalance compensation system, mainly used for IQ imbalance correction of a TDD zero intermediate frequency single carrier transceiver, including the following parts: calibrator, channel detection, the system can execute the following specific steps:
and S1, when the transceiver is calibrated off-site, IQ imbalance estimation is carried out (the I path is not changed by default, and the imbalance of the amplitude and the phase is mainly in the Q path), and the imbalance values a _ I and a _ Q of the amplitude and the phase are respectively obtained and stored in a register.
And S2, when the system is in a receiving state, reporting the current SNR to software.
S201, the software calculates the SNR average value in the current receiving state according to the reported SNR. Let us assume that k subframes are currently received, SNR _ m ═ SNR (1) + … + SNR (k))/k.
S202, before the transceiving switching, judging an IQ compensation mode of current transmission according to SNR _ m and a modulation order of the current transmission, if the SNR _ m is greater than SNR _ thr and the modulation order is low-order modulation (modulation order mode _ type < thr), storing the compensation mode in a register 2 as a software compensation constellation point. Otherwise, the hardware compensation mode is used for compensation at the transmitting channel.
S3, according to the compensation mode outputted by S2, IQ imbalance compensation is performed by using the compensation value in the register 1.
S301, when in a software compensation mode, IQ imbalance compensation is firstly carried out on constellation points which can be matched by software, the compensated data is placed in a register 2, and the constellation points compensated in the register 2 are used during transmission modulation. Calibrator in Bypass hardware data channel.
S302, in the hardware compensation mode, when the DFE digital channel is close to the RF position, the IQ is subjected to imbalance compensation through the calibrator. At this time, the software does not compensate for the constellation points.
S303, the calculation formulas of the two compensations are consistent as follows:
and outputting a signal y, wherein the input signal is x, the amplitude imbalance compensation parameter is a _ I _ m, and the phase imbalance compensation parameter is alpha _ m:
y_I＝x_I。
y_Q＝a_I_m*x_Q+alpha_m*x_I。
and S4, directly outputting the calibrated data.
In this embodiment, a mechanism combining channel monitoring, simplified pre-compensation and pre-compensation is adopted to perform IQ imbalance time domain compensation of the transmitter. When the channel condition is better, a simplified precompensation mechanism is adopted, so that the power consumption can be effectively reduced.
EXAMPLE five
The invention 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 implementation. 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 ways. The above-described system embodiments are merely exemplary, and it is exemplary that the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, and it is exemplary that a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. An IQ compensation method for a single carrier transceiver, comprising the steps of:
acquiring an initial IQ imbalance value after IQ imbalance estimation of factory calibration;
determining a current IQ compensation path according to a current receiving signal-to-noise ratio and a current transmitting modulation order;
and performing IQ compensation 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 based on a current received signal-to-noise ratio and a current transmit modulation order comprises the steps of:
calculating the average value of the current receiving signal-to-noise ratio according to the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
the SNR _ m is the average value of the current receiving signal-to-noise ratio, and K is the number of the currently received subframes;
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.
3. The IQ compensation method for a single carrier transceiver according to claim 2 wherein the determining the current IQ compensation path based on the current received signal-to-noise ratio average and the current transmit modulation order prior to switching from a receive state to a transmit state 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.
4. IQ compensation method according to claim 3, wherein the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
performing IQ compensation by using the software compensation path and the initial IQ imbalance value, specifically comprising: and modulating the constellation points to generate IQ imbalance compensation parameters, and storing the IQ imbalance compensation parameters for IQ compensation.
5. IQ compensation method according to claim 3, wherein the IQ compensation based on the current IQ compensation path and the initial IQ imbalance value comprises the steps of:
performing IQ compensation by using the hardware compensation path and the initial IQ imbalance value, specifically comprising: and performing IQ compensation through a calibrator according to IQ imbalance compensation parameters corresponding to the initial IQ imbalance values.
6. IQ compensation method according to claim 4 or 5, 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 parameters to carry out 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.
7. An IQ compensation apparatus for a single carrier transceiver, comprising:
an obtaining module, configured to obtain an initial IQ imbalance value after IQ imbalance estimation in factory calibration;
the determining module is used for determining a current IQ compensation path according to a current receiving signal-to-noise ratio and a 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.
8. The IQ compensation apparatus for a single-carrier transceiver according to claim 7, wherein the determining module is further configured to:
calculating the average value of the current receiving signal-to-noise ratio according to the current receiving signal-to-noise ratio, wherein the calculation formula is as follows:
SNR_m＝(SNR(1)+…+SNR(k))/k；
the SNR _ m is the average value of the current receiving signal-to-noise ratio, and K is the number of the currently received subframes;
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.
9. The IQ compensation apparatus for a single-carrier transceiver according to claim 8, wherein 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.
10. Single carrier transceiver, characterized in that it comprises IQ compensation means of a single carrier transceiver according to any one of claims 7 to 9.
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