CN117675489A - Signal correction method and device - Google Patents

Abstract

The embodiment of the application provides a signal correction method and device, wherein the circuit comprises the following steps: the digital baseband processing module, the analog module, the digital intermediate frequency mixing module, the gating module and the correcting module are transmitted, and the output signal of the digital baseband processing module, the real part signal and the imaginary part signal of the output of the digital intermediate frequency synthesizer and the gating signal are respectively input to the input end of the gating module; the correction module is used for receiving the first signal to be corrected and the second signal to be corrected, which are output by the gating module, and correcting the first signal to be corrected and the second signal to be corrected by adopting a first correction unit or a second correction unit to carry out frequency and amplitude correction to obtain corrected signals, the phase difference between the first signal to be corrected and the second signal to be corrected is 90 degrees, and the gating module and the correction module are added to correct the orthogonal first signal to be corrected and the second signal to be corrected, so that mismatch of the IQ signals can be corrected rapidly, and the correction efficiency is improved.

Description

Signal correction method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a signal correction method and apparatus.

Background

With the progress of semiconductor technology and the continuous enhancement of miniaturization, low power consumption and multifunctional requirements of mobile communication equipment, the direct orthogonal up-conversion technology based on quadrature modulation is rapidly developed. It can directly shift the baseband signal to radio frequency, i.e. zero-IF transmitter. Because of the imbalance of the amplitude and the phase of the local oscillation signal of the radio frequency mixer, IQ mismatch is caused, an unwanted image can directly fall in the frequency spectrum range of a required signal, the demodulation performance of a receiver is directly reduced, if the image power is large enough, communication faults can occur, and how to quickly correct the IQ signal mismatch is a problem which needs to be solved at present.

Disclosure of Invention

An object of some embodiments of the present application is to provide a signal correction method and apparatus, by which the technical solution of the embodiments of the present application includes: the system comprises an emission digital baseband processing module, an emission analog module, a digital intermediate frequency mixing module, a gating module and a correction module, wherein the emission digital baseband processing module is connected with the correction module through the gating module, the output end of the correction module is connected with the emission analog module, and the digital intermediate frequency mixing module is connected with the gating module; the input end of the gating module is respectively input with the output signal of the transmitting digital baseband processing module, the real part signal and the imaginary part signal of the output of the digital intermediate frequency synthesizer and the gating signal; the correction module is used for receiving a first signal to be corrected and a second signal to be corrected, which are output by the gating module, and correcting the first signal to be corrected and the second signal to be corrected by adopting a first correction unit or a second correction unit to obtain corrected signals, wherein the phase difference between the first signal to be corrected and the second signal to be corrected is 90 degrees. According to the embodiment of the application, the gating module and the correction module are added to correct the orthogonal first signal to be corrected and the second signal to be corrected, so that IQ signal mismatch can be corrected rapidly, and correction efficiency is improved.

In a first aspect, some embodiments of the present application provide a signal correction apparatus, the signal correction apparatus comprising: the system comprises an emission digital baseband processing module, an emission analog module, a digital intermediate frequency mixing module, a gating module and a correction module, wherein the emission digital baseband processing module is connected with the correction module through the gating module, the output end of the correction module is connected with the emission analog module, and the digital intermediate frequency mixing module is connected with the gating module;

the input end of the gating module is respectively input with the output signal of the transmitting digital baseband processing module, the real part signal and the imaginary part signal of the output of the digital intermediate frequency synthesizer and the gating signal;

the correction module is used for receiving a first signal to be corrected and a second signal to be corrected, which are output by the gating module, and correcting the first signal to be corrected and the second signal to be corrected by adopting a first correction unit or a second correction unit to obtain corrected signals, wherein the phase difference between the first signal to be corrected and the second signal to be corrected is 90 degrees.

According to the method and the device, the gating module and the correcting module are added to correct the first signal to be corrected and the second signal to be corrected which are orthogonal, so that IQ signal mismatch can be corrected rapidly, and correction efficiency is improved.

Optionally, the first correction unit at least includes an adjustment subunit, where the correction unit is configured to generate a first complex signal and a second complex signal according to the first signal to be corrected and the second signal to be corrected, and the adjustment subunit is configured to perform gain adjustment and phase adjustment on the second complex signal to obtain a predistortion image signal, and the correction unit is configured to determine the corrected signal according to the first complex signal and the predistortion image signal.

Some embodiments of the present invention may be used in a system where IQ mismatch in the effective bandwidth of a signal is independent of frequency, and the first correction unit adds some predistortion image signals in advance in the baseband, so that these image interferences can cancel interference generated in the subsequent analog radio frequency mixing process, and accuracy of signal correction is improved.

Optionally, the second correction unit is configured to determine a first complex signal according to the first signal to be corrected and the second signal to be corrected, perform fourier transform on the first complex signal to obtain a frequency domain signal, perform frequency filtering processing on the frequency domain signal to obtain a filtered signal, and perform short-time inverse fourier transform on the filtered signal to obtain the corrected signal.

Some embodiments of the present invention may be used in a system where IQ mismatch in the effective bandwidth of a signal is related to frequency, and gain adjustment parameters and phase adjustment parameters for different frequency points are different, so IQ mismatch correction needs to be performed on a frequency domain, that is, a signal is subjected to fourier transform and then filtered, and then is converted back to a time domain signal through short-time inverse fourier transform, so that accuracy of signal processing is improved.

In a second aspect, some embodiments of the present application provide a signal correction method applied to any one of the signal correction apparatuses described in the first aspect, the method including:

acquiring a first signal to be corrected and a second signal to be corrected, wherein the phase difference of the first signal to be corrected and the second signal to be corrected is 90 degrees;

acquiring radio frequency power at one or more preset frequency points within a preset signal bandwidth;

determining an interference suppression signal at a preset frequency point according to the radio frequency power, a preset gain adjustment algorithm and a preset phase algorithm;

judging the sizes of interference suppression signals under the conditions of different gain values and different phase differences;

and correcting the first signal to be corrected and the second signal to be corrected according to the judging result to obtain corrected signals.

According to the method and the device, the gating module and the correcting module are added to correct the first signal to be corrected and the second signal to be corrected which are orthogonal, so that IQ signal mismatch can be corrected rapidly, and correction efficiency is improved.

Optionally, the acquiring radio frequency power at one or more preset frequency points within the preset signal bandwidth includes:

under the condition that the gating signal is a first gating value, acquiring first radio frequency power at a first frequency point in a preset signal bandwidth;

and under the condition that the gating signal is a second gating value, acquiring second radio frequency power at a first frequency point in the preset signal bandwidth.

Some embodiments of the present application set different gating values for gating signals of a gating module, and obtain radio frequency power at a first frequency point within a preset signal bandwidth under the condition of obtaining the different gating values.

Optionally, the determining the interference suppression signal at the preset frequency point according to the radio frequency power, the preset gain adjustment algorithm and the preset phase algorithm includes:

determining an amplitude difference at a first frequency point according to the first radio frequency power and the second radio frequency power;

determining a first gain value and a first phase value according to the amplitude difference, a preset gain adjustment algorithm and a preset phase algorithm;

Acquiring third radio frequency power at a first frequency point and fourth radio frequency power at a second frequency point in a preset signal bandwidth under the condition that the gating signal is a third preset value; wherein the first gain value and the first phase value correspond to a third radio frequency power at a first frequency point and a fourth radio frequency power at a second frequency point;

determining a first interference suppression signal according to the third radio frequency power and the fourth radio frequency power;

and determining a second interference suppression signal according to the first interference suppression signal and the amplitude difference.

In some embodiments of the present application, the first gain value and the first phase value at the first frequency point are calculated, so as to obtain the corresponding third radio frequency power and fourth radio frequency power, and then the first interference suppression signal and the second interference suppression signal are calculated, so as to determine whether the correction is correct.

Optionally, the determining a second interference suppression signal according to the first interference suppression signal and the amplitude difference includes:

determining a phase difference between a first signal to be corrected and a second signal to be corrected according to the first interference suppression signal and the amplitude difference;

determining a second gain value and a second phase difference according to the phase difference, the preset gain adjustment algorithm and the preset phase algorithm;

Acquiring fifth radio frequency power at a first frequency point and sixth radio frequency power at a second frequency point in a preset signal bandwidth; wherein the second gain value and the second phase value correspond to a fifth radio frequency power at the first frequency point and a sixth radio frequency power at the second frequency point;

and determining a second interference suppression signal according to the fifth radio frequency power and the sixth radio frequency power.

According to some embodiments of the application, through the first interference suppression signal and the amplitude difference, the phase difference between the first signal to be corrected and the second signal to be corrected is calculated and determined, according to the phase difference, the preset gain adjustment algorithm and the preset phase algorithm, the second gain value and the second phase difference are determined, the second gain value and the second phase difference are calculated, the fifth radio frequency power and the sixth radio frequency power corresponding to the second gain value and the second phase difference are obtained, and then the second interference suppression signal is calculated.

Optionally, the determining the magnitude of the interference suppression signal under different gain values and different phase differences includes:

if the second interference suppression signal is smaller than or equal to the first interference suppression signal, determining a second gain value and a second phase difference corresponding to the second interference suppression signal as target gain adjustment data and target phase adjustment data;

If the second interference suppression signal is greater than the first interference suppression signal, calculating a third gain value and a fourth gain value according to the preset gain adjustment algorithm and the preset phase algorithm, and determining the third gain value and the fourth gain value as the target gain adjustment data and the target phase adjustment data.

According to the method and the device, the target adjusting data are determined by comparing the interference suppression signals of the front time and the back time, and then the first signal to be corrected and the second signal to be corrected are corrected through the target adjusting data, so that corrected signals are obtained, and the correction accuracy is improved.

Optionally, the correcting the first signal to be corrected and the second signal to be corrected according to the determination result to obtain corrected signals includes:

and correcting the first signal to be corrected and the second signal to be corrected according to the target gain adjustment data and the target phase adjustment data to obtain corrected signals.

According to the method and the device, the target adjusting data are determined by comparing the interference suppression signals of the front time and the back time, and then the first signal to be corrected and the second signal to be corrected are corrected through the target adjusting data, so that corrected signals are obtained, and the correction accuracy is improved.

In a third aspect, some embodiments of the present application provide a radio frequency transceiver chip, which at least includes the signal correction device described in the first aspect.

Drawings

In order to more clearly illustrate the technical solutions of some embodiments of the present application, the drawings that are required to be used in some embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort to a person having ordinary skill in the art.

Fig. 1 is a schematic structural diagram of a signal correction device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of another signal correction device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a first calibration unit according to an embodiment of the present application;

FIG. 4 is a diagram illustrating image rejection comparisons before and after IQ mismatch correction according to an embodiment of the present application;

fig. 5 is a schematic diagram of a pre-correction constellation provided in an embodiment of the present application;

fig. 6 is a schematic diagram of a corrected constellation provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a second correction unit according to an embodiment of the present application;

FIG. 8 is a schematic diagram of gain adjustment parameters according to an embodiment of the present disclosure;

fig. 9 is a schematic diagram of a phase adjustment parameter provided in an embodiment of the present application;

fig. 10 is a schematic diagram of a pre-correction constellation received by a receiving end according to an embodiment of the present application;

fig. 11 is a schematic diagram of a corrected constellation received by a receiving end according to an embodiment of the present application;

fig. 12 is a flowchart of a signal correction method according to an embodiment of the present application.

Detailed Description

The technical solutions in some embodiments of the present application will be described below with reference to the drawings in some embodiments of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.

With the progress of semiconductor technology and the continuous enhancement of miniaturization, low power consumption and multifunctional requirements of mobile communication equipment, the direct orthogonal up-conversion technology based on quadrature modulation is rapidly developed. It can directly shift the baseband signal to radio frequency, i.e. zero-IF transmitter. Zero if technology has a significant disadvantage, because of the imbalance of the amplitude and phase of the local oscillator signal of the radio frequency mixer, resulting in IQ mismatch, unwanted images can fall directly in the frequency spectrum of the desired signal, directly resulting in reduced demodulation performance of the receiver, and if the image power is large enough, communication failure occurs, and in view of this, some embodiments of the present application provide a signal correction device, which includes: the system comprises an emission digital baseband processing module, an emission analog module, a digital intermediate frequency mixing module, a gating module and a correction module, wherein the emission digital baseband processing module is connected with the correction module through the gating module, the output end of the correction module is connected with the emission analog module, and the digital intermediate frequency mixing module is connected with the gating module; the input end of the gating module is respectively input with an output signal of the transmitting digital baseband processing module, a real part signal and an imaginary part signal of the output of the digital intermediate frequency synthesizer and a gating signal; the correction module is used for receiving the first signal to be corrected and the second signal to be corrected, which are output by the gating module, and correcting the frequency and the amplitude of the first signal to be corrected and the second signal to be corrected by adopting a first correction unit or a second correction unit to obtain corrected signals, wherein the phase difference between the first signal to be corrected and the second signal to be corrected is 90 degrees. According to the embodiment of the application, the gating module and the correction module are added to correct the orthogonal first signal to be corrected and the second signal to be corrected, so that IQ signal mismatch can be corrected rapidly, and correction efficiency is improved.

As shown in fig. 1, an embodiment of the present application provides a signal correction device, that is, a signal correction device, including: the digital intermediate frequency mixing module 104 is connected with the gating module 102, wherein the digital baseband processing module 101 is connected with the correcting module 103 through the gating module 102, the output end of the correcting module 103 is connected with the analog transmitting module 105, and the digital intermediate frequency mixing module 104 is connected with the gating module 102;

the input end of the gating module 102 is respectively input with an output signal of the transmitting digital baseband processing module 101, a real part signal and an imaginary part signal of the output of the digital intermediate frequency synthesizer and a gating signal; in the embodiment of the application, two gating modules are provided, one gating module is used for gating a first signal to be corrected, and the other gating module is used for gating a second signal to be gated.

The correction module 103 is configured to receive the first signal to be corrected and the second signal to be corrected output by the gating module 102, and correct the first signal to be corrected and the second signal to be corrected by using the first correction unit or the second correction unit to obtain corrected signals, where a phase difference between the first signal to be corrected and the second signal to be corrected is 90 degrees. The first correction unit and the second correction unit are used for different systems, respectively. The first signal to be corrected and the second signal to be corrected are IQ signals, i.e. quadrature signals.

According to the method and the device, the gating module and the correcting module are added to correct the first signal to be corrected and the second signal to be corrected which are orthogonal, so that IQ signal mismatch can be corrected rapidly, and correction efficiency is improved.

Fig. 2 is a schematic structural diagram of another signal correction device provided in an embodiment of the present application, as shown in fig. 2, where the embodiment of the present application is applied to a radio frequency transmitter and a radio frequency receiver, and the radio frequency transmitter is in a zero intermediate frequency structure, and the radio frequency receiver is in a low intermediate frequency structure.

With the progress of semiconductor technology and the continuous enhancement of miniaturization, low power consumption and multifunctional requirements of mobile communication equipment, the direct orthogonal up-conversion technology based on quadrature modulation is rapidly developed. It can directly shift the baseband signal to radio frequency, i.e. zero-IF transmitter.

The zero intermediate frequency circuit is realized by only two modules of DAC (digital-to-analog converter) and IQ modulation, the circuit structure is simple, compared with a secondary frequency conversion scheme, an intermediate frequency mixing circuit, an intermediate frequency filter circuit and the like are omitted, the complexity and the number of devices of a transmitter system are reduced, and the system volume, the weight, the power consumption and the cost are also greatly reduced; in the zero intermediate frequency technology, due to unbalance of the amplitude and the phase of the local oscillation signal of the radio frequency mixer, IQ is not matched, an unwanted image can directly fall in the frequency spectrum range of a required signal, demodulation performance of a receiver is directly reduced, and communication faults can occur if the image power is large enough.

The low intermediate frequency receiver structure can reduce the IQ mismatch and the influence of direct current bias, the low intermediate frequency usually carries out secondary down-conversion after the ADC, and the low intermediate frequency comprises a digital mixer with adjustable frequency.

For a transceiver radio frequency system, the transceiver radio frequency system comprises a transmitting path and a receiving path, wherein the transmitting path and the receiving path comprise a digital circuit and an analog circuit. Wherein:

the transmitting path specifically includes:

a transmit digital baseband processing module 101, implementing digital baseband quadrature modulation, such as AM, PM, CPM, QAM, OFDM;

DAC: realizing digital-to-analog conversion of baseband modulation signals and digital-to-analog conversion;

LPF: realizing analog DAC output signal filtering;

TX mixer: the quadrature up-conversion is realized, and the carrier signal in the ideal case of the TX mixer is as follows: cos (omega) _c t)-j*sin(ω _c t)；

If there is IQ mismatch, the carrier signal becomes

PA: amplifying the transmitting signal;

the receiving path specifically includes:

LNA: amplifying the signal received by the antenna with low noise;

RX radio frequency mixer: implementing quadrature down-conversion of the radio frequency signal to an intermediate frequency signal;

BPF/LPF: channel filtering is realized to filter out-of-band noise and interference;

ADC: realizing digital quantization of intermediate frequency analog signals;

digital intermediate frequency mixer: secondary mixing of intermediate frequency signals to baseband signals, wherein an intermediate frequency synthesizer is used to generate a variable intermediate frequency cos (omega) _IF t) and sin (ω) _ID t)，ω _IF ＝2πf _IF ，f _IF Is a variable intermediate frequency, can define the range according to the system requirement, and is generally supported the mostLarge values need to exceed the signal bandwidth.

LPF: channel filtering is realized, and out-of-band noise and interference are further filtered;

the connection of the digital intermediate frequency synthesizer on the receive path to the transmit path and the path selection (MUX) on the transmit path, i.e., selection module 102, and the IQ mismatch pre-correction module, i.e., correction module 103, are added to the basic path module in the embodiments of the present application.

A path selection (MUX) module 102: the selection of signals on the I path and the Q path is realized, and the signals are respectively controlled by the I_sel and the Q_sel;

when I_sel is configured to be 0, the MUX output is the I-way output of the transmitting digital baseband processing module;

when I_sel is configured to be 1, the MUX output is the I-way output of the digital intermediate frequency synthesizer;

when I_sel is configured to be 2, the MUX output is the Q-way output of the digital intermediate frequency synthesizer;

When I_sel is configured to 3, the MUX output is 0.

When Q_sel is configured to be 0, the MUX output is the Q-way output of the transmitting digital baseband processing module;

when Q_sel is configured to be 1, the MUX output is the I-way output of the digital intermediate frequency synthesizer;

when Q_sel is configured to be 2, the MUX output is the Q-way output of the digital intermediate frequency synthesizer;

when Q_sel is configured to 3, the MUX output is 0.

I_sel and q_sel as chip control registers may be configured by an on-chip CPU or an external MCU.

As shown in fig. 3, for the IQ mismatch-independent frequency system in the effective bandwidth of the signal, the IQ mismatch is considered to be consistent in the frequency band, and the IQ mismatch pre-correction module pre-adds some image interference in the baseband, so that the image interference can cancel interference generated in the following analog radio frequency mixing process.

Optionally, the first correction unit at least includes an adjusting subunit, the correction unit is configured to generate a first complex signal and a second complex signal according to the first signal to be corrected and the second signal to be corrected, the adjusting subunit is configured to perform gain adjustment and phase adjustment on the second complex signal to obtain a predistortion image signal, and the correction unit is configured to determine a corrected signal according to the first complex signal and the predistortion image signal.

In particular, the gain adjustment module, i.e. the adjustment subunit, implements a gain adjustment g of the input signal _d And phase adjustment omega _d The output is a predistortion image signal, and the mathematical expression is as follows:

wherein g _d And omega _d The chip is required to be obtained through testing in an automatic testing stage of chip mass production, and an external spectrometer is required to be connected in the testing process to read signal power.

Some embodiments of the present invention may be used in a system where IQ mismatch in the effective bandwidth of a signal is independent of frequency, and the first correction unit adds some predistortion image signals in advance in the baseband, so that these image interferences can cancel interference generated in the subsequent analog radio frequency mixing process, and accuracy of signal correction is improved.

As shown in fig. 7, the second correction unit is configured to determine a first complex signal according to the first signal to be corrected and the second signal to be corrected, perform fourier transform on the first complex signal to obtain a frequency domain signal, perform frequency filtering processing on the frequency domain signal to obtain a filtered signal, and perform short-time inverse fourier transform on the filtered signal to obtain a corrected signal.

For systems where IQ mismatch within the effective bandwidth of the signal is related to frequency, IQ signal mismatch is not consistent within the frequency band, and the logic of the IQ mismatch pre-correction module is as follows:

Due to IQ mismatch of different frequency points, i.e. for different frequency points g _d And omega _d Different, therefore, IQ mismatch correction in the frequency domain is requiredThe positive value corresponds to a frequency filter Hcplex (j 2 pi f) so that the signal is subjected to short-time fourier transform (stft), filtered by Hcplex (j 2 pi f), and then converted back into a time-domain signal by short-time inverse fourier transform.

Hcplex (j 2 pi f) implementation

Wherein: g _d (f) And omega _d (f) Corresponding frequency points are output according to stft, and corresponding in-band frequency points are selected for calculation.

Some embodiments of the present invention may be used in a system where IQ mismatch in the effective bandwidth of a signal is related to frequency, and gain adjustment parameters and phase adjustment parameters for different frequency points are different, so IQ mismatch correction needs to be performed on a frequency domain, that is, a signal is subjected to fourier transform and then filtered, and then is converted back to a time domain signal through short-time inverse fourier transform, so that accuracy of signal processing is improved.

As shown in fig. 12, an embodiment of the present application provides a signal correction method, which is applied to the signal correction device, and includes:

s1201, a first signal to be corrected and a second signal to be corrected are obtained, wherein the phase difference of the first signal to be corrected and the second signal to be corrected is 90 degrees;

S1202, acquiring radio frequency power at one or more preset frequency points in a preset signal bandwidth;

in this embodiment of the present application, a preset frequency point may be selected for a system in which IQ mismatch is related to frequency in the effective bandwidth of the signal, and radio frequency power at the preset frequency point may be obtained, and a plurality of preset frequency points may be selected for a system in which IQ mismatch is related to frequency in the effective bandwidth of the signal, and radio frequency power at the preset frequency point may be obtained.

S1203, determining an interference suppression signal at a preset frequency point according to the radio frequency power, a preset gain adjustment algorithm and a preset phase algorithm;

specifically, the correction module calculates two interference suppression signals after front and back phases and gain changes at a preset frequency point according to the acquired radio frequency power at the preset frequency point, a preset gain adjustment algorithm and a preset phase algorithm; or the correction module calculates the interference suppression signals of the front and rear two times after the phase and the gain change by adopting the algorithm of the second correction unit according to the acquired radio frequency power at a plurality of preset frequency points.

S1204, judging the sizes of interference suppression signals under the conditions of different gain values and different phase differences;

Specifically, the correction module compares the interference suppression signals in the case where different gain values and different phase differences are acquired.

And S1205, correcting the first signal to be corrected and the second signal to be corrected according to the judging result to obtain corrected signals.

Specifically, the correction module compares the interference suppression signals of the two times before and after to judge whether the correction effect is achieved under the condition that the amplitude and the frequency are continuously changed, so that the two times of interference suppression signals are compared to obtain target gain adjustment data and target phase adjustment data, and the first signal to be corrected and the second signal to be corrected, namely the IQ signal, are corrected according to the target gain adjustment data and the target phase adjustment data to obtain corrected signals.

According to the method and the device, the gating module and the correcting module are added to correct the first signal to be corrected and the second signal to be corrected which are orthogonal, so that IQ signal mismatch can be corrected rapidly, and correction efficiency is improved.

In a further embodiment of the present application, the signal correction method provided in the foregoing embodiment is further described in additional detail.

Optionally, acquiring radio frequency power at one or more preset frequency points within a preset signal bandwidth includes:

Under the condition that the gating signal is a first gating value, acquiring first radio frequency power at a first frequency point in a preset signal bandwidth;

and under the condition that the gating signal is a second gating value, acquiring second radio frequency power at a first frequency point in the preset signal bandwidth.

Wherein the first frequency point comprises the frequency f of the digital intermediate frequency synthesizer _IF And the frequency value f to be corrected _LO For example the frequency of WiFi to be corrected, i.e. f _LO Is the frequency value of WiFi.

Specifically, 1) configuring the chip to be in a continuous emission state;

2) Configuring a digital intermediate frequency synthesizer and configuring an intermediate frequency f _IF For a value within the signal bandwidth, assume that the effective bandwidth of the baseband signal is-1 MHz to 1MHz, f _IF May be configured to be 500kHz;

3) Configure the first strobe value i_sel=1, q_sel=3, g _d ＝0,ω _d =0, corresponding f on read spectrometer _LO +f _IF The radio frequency power of the frequency point is the first radio frequency power and is marked as P _I ；

4) Configuration i_sel=3, q_sel=1, g _d ＝0,ω _d =0, corresponding f on read spectrometer _LO +f _IF The radio frequency power of the frequency point is the second radio frequency power and is marked as P _Q 。

Some embodiments of the present application set different gating values for gating signals of a gating module, and obtain radio frequency power at a first frequency point within a preset signal bandwidth under the condition of obtaining the different gating values.

Optionally, determining the interference suppression signal at the preset frequency point according to the radio frequency power, the preset gain adjustment algorithm and the preset phase algorithm includes:

determining an amplitude difference at a first frequency point according to the first radio frequency power and the second radio frequency power;

determining a first gain value and a first phase value according to the amplitude difference, a preset gain adjustment algorithm and a preset phase algorithm;

acquiring third radio frequency power at a first frequency point and fourth radio frequency power at a second frequency point in a preset signal bandwidth under the condition that the gating signal is a third preset value; the first gain value and the first phase value correspond to third radio frequency power at the first frequency point and fourth radio frequency power at the second frequency point;

determining a first interference suppression signal according to the third radio frequency power and the fourth radio frequency power;

and determining a second interference suppression signal according to the first interference suppression signal and the amplitude difference.

In particular, the method comprises the steps of,

5) Calculating an IQ two-way amplitude difference, namely, the amplitude difference at a first frequency point:

order theCalculating a first gain value and a first phase difference:

6) Configuring the strobe signal to a third preset value i_sel=1, q_sel=2, g _d ，ω _d Reading the corresponding f on the spectrometer for the value calculated in 5) _LO +f _IF The radio frequency power of the frequency point, namely the third radio frequency power, is denoted as P _sig Reading the corresponding f on the spectrometer _LO -f _IF The RF power of the frequency point, namely the fourth RF power, is denoted as P _img 。

Calculating an image interference suppression value, namely a first interference suppression signal IRRr0=P _img -P _sig 。

In some embodiments of the present application, the first gain value and the first phase value at the first frequency point are calculated, so as to obtain the corresponding third radio frequency power and fourth radio frequency power, and then the first interference suppression signal and the second interference suppression signal are calculated, so as to determine whether the correction is correct.

Optionally, determining the second interference suppression signal according to the first interference suppression signal and the amplitude difference includes:

determining a phase difference between the first signal to be corrected and the second signal to be corrected according to the first interference suppression signal and the amplitude difference;

determining a second gain value and a second phase difference according to the phase difference, the preset gain adjustment algorithm and the preset phase algorithm;

acquiring fifth radio frequency power at a first frequency point and sixth radio frequency power at a second frequency point in a preset signal bandwidth; the second gain value and the second phase value correspond to the fifth radio frequency power at the first frequency point and the sixth radio frequency power at the second frequency point;

And determining a second interference suppression signal according to the fifth radio frequency power and the sixth radio frequency power.

Specifically, 7) calculating the phase error of I and Q

Wherein r=10 ^(IRR0)/10 G is g calculated in the fifth step;

order theAgain calculating a second gain value and a second phase difference;

8) Configuration g _d ，ω _d Reading the corresponding f on the spectrometer for the value calculated in 7) _LO +f _IF Frequency point is the firstFifth RF power at a frequency point, denoted as P _sig Reading the corresponding f on the spectrometer _LO -f _IF The frequency point is the radio frequency power of the second frequency point, namely the sixth radio frequency power, and is marked as P _img . Calculating image interference rejection, i.e. the second interference rejection signal irr1=p _img -P _sig 。

According to some embodiments of the application, through the first interference suppression signal and the amplitude difference, the phase difference of the first signal to be corrected and the second signal to be corrected is calculated and determined, according to the phase difference, a preset gain adjustment algorithm and a preset phase algorithm, a second gain value and a second phase difference are determined, the second gain value and the second phase difference are calculated, fifth radio frequency power and sixth radio frequency power corresponding to the second gain value and the second phase difference are obtained, and then the second interference suppression signal is calculated.

Optionally, determining the magnitude of the interference suppression signal under different gain values and different phase differences includes:

If the second interference suppression signal is smaller than or equal to the first interference suppression signal, determining a second gain value and a second phase difference corresponding to the second interference suppression signal as target gain adjustment data and target phase adjustment data;

if the second interference suppression signal is larger than the first interference suppression signal, calculating a third gain value and a fourth gain value according to a preset gain adjustment algorithm and a preset phase algorithm, and determining the third gain value and the fourth gain value as target gain adjustment data and target phase adjustment data.

Specifically, if the second interference suppression signal IRR1 is less than or equal to the first interference suppression signal IRR0, the interference suppression is corrected correctly. Adjusting the current target gain to data g _d Target phase adjustment data omega _d The memory area which is not lost when the chip is powered down is saved, the chip can be read during normal power-on operation, and the process is finished.

If the first interference suppression signal IRR1>Second interference suppression signal IRR0The correct parameters are the following/>Calculation of

G calculated at this time _d ，ω _d The chip can be read when the chip is powered up normally.

9) The configuration chip resumes the normal transceiving and correction mode, configures i_sel=0, q_sel=0, and the flow ends.

According to the method and the device, the target adjusting data are determined by comparing the interference suppression signals of the front time and the back time, and then the first signal to be corrected and the second signal to be corrected are corrected through the target adjusting data, so that corrected signals are obtained, and the correction accuracy is improved.

Optionally, correcting the first signal to be corrected and the second signal to be corrected according to the judgment result to obtain corrected signals, including:

and correcting the first signal to be corrected and the second signal to be corrected according to the target gain adjustment data and the target phase adjustment data to obtain corrected signals.

Specifically, the gating module that obtains the target gain adjustment data and the target phase adjustment data through the calculation in the steps 5) to 8) is connected with the digital intermediate frequency mixing module, and when the correction is performed, the gating module is switched and connected with the transmitting digital baseband processing module, and the step 9) is executed.

In the embodiment of the application, the correction method of the embodiment can be adopted to calculate and obtain the correct parameters of IQ mismatch correction, wherein only 3), 4), 6), 8) need the output of the tester to be stably read again, the rest steps are CPU calculation and configuration, the time can be ignored, and the time consumed by the whole flow is microsecond.

As shown in fig. 4, for the IQ mismatch correction before and after image rejection comparison, where fc=2.4 ghz, g=0.9,

in the presence of a modulated signal, e.g., 8PSK, the constellation and EVM performance pairs before and after correction, such as shown in fig. 5 and 6, the EVM average increases by 1.8dB after correction, as shown in fig. 5 and 6.

For the system that IQ mismatch in the effective bandwidth of the signal is related to frequency, IQ mismatch is not consistent in the frequency band, and logic of the IQ mismatch pre-correction module is as shown in fig. 7:

due to IQ mismatch of different frequency points, namely, for different frequency points g _d And omega _d In contrast, IQ mismatch correction is required in the frequency domain, which corresponds to a frequency filter Hcplex (j 2 pi f) so that the signal is subjected to short-time fourier transform (stft), filtered by Hcplex (j 2 pi f), and converted back into a time-domain signal by short-time inverse fourier transform. Hcplex (j 2 pi f) implementation

Wherein g _d (f) And omega _d (f) The test in 1) to 8) is carried out by selecting corresponding in-band frequency points by outputting corresponding frequency points according to stft, and the method for obtaining the corresponding frequency points is to configure f _IF Is the absolute value of the current frequency point. If the frequency bin to be measured is negative, then in step 6) i_sel=2 and q_sel=1.

The following is a specific example:

the modulator is 8PSK, the signal bandwidth is-20 MHz- +20MHz, the stft is assumed to select Fourier transform length N=1024, the input sampling frequency is 240MHz, the output X (j 2 pi f) of the stft,

f＝[-120MHz、-120MHz+df、-120MHz+2*df、…120MHz]step size

The in-band frequency points to be measured are f_ = [ -df, -2 x df, -3 x df, … -86 x df ] and f+ = [ df, 2 x df, 3 x df … x 86 x df ], 86 points in total.

Wherein f_is measured by respectively configuring f in step 2) _IF -df, -2 x df, -3 x df, … -86 x df, i_sel=2 and q_sel=1 are configured in step 6), the other steps being unchanged.

Wherein f+ is measured in step 2) to configure f respectively _IF =df, 2×df … 86 ×86×df, the other steps are unchanged.

172 g need to be calculated _d ，ω _d The chip is stored in a storage area which is not lost when the chip is powered down, the chip can be read when the chip is powered up normally and is configured in a chip hardware register, so that the chip IQ pre-correction module can work normally, and the flow is ended.

Correcting the obtained correction parameter g according to the above method _d (f)，ω _d (f) As shown in fig. 8 and 9. Before and after correction, the constellation diagram result received by the receiving end is shown in fig. 10, the corrected result is shown in fig. 11, the average value of the EVM is increased by 4dB, wherein the fourier transform length can directly affect the frequency point number to be measured, and in practice, the frequency point number can be adjusted according to the sampling rate of the system and the IQ mismatch variation trend in the bandwidth, so as to reduce the test time and the hardware circuit area.

According to the method and the device, the target adjusting data are determined by comparing the interference suppression signals of the front time and the back time, and then the first signal to be corrected and the second signal to be corrected are corrected through the target adjusting data, so that corrected signals are obtained, and the correction accuracy is improved.

It should be noted that, in this embodiment, each of the possible embodiments may be implemented separately, or may be implemented in any combination without conflict, which is not limited to the implementation of the present application.

The above is only an example of the present application, and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. A signal correction device, characterized in that the signal correction device comprises: the system comprises an emission digital baseband processing module, an emission analog module, a digital intermediate frequency mixing module, a gating module and a correction module, wherein the emission digital baseband processing module is connected with the correction module through the gating module, the output end of the correction module is connected with the emission analog module, and the digital intermediate frequency mixing module is connected with the gating module;

The input end of the gating module is respectively input with the output signal of the transmitting digital baseband processing module, the real part signal and the imaginary part signal of the output of the digital intermediate frequency synthesizer and the gating signal;

the correction module is used for receiving a first signal to be corrected and a second signal to be corrected, which are output by the gating module, and correcting the first signal to be corrected and the second signal to be corrected by adopting a first correction unit or a second correction unit to obtain corrected signals, wherein the phase difference between the first signal to be corrected and the second signal to be corrected is 90 degrees.

2. The signal correction device according to claim 1, wherein the first correction unit comprises at least an adjustment subunit, the correction unit is configured to generate a first complex signal and a second complex signal according to the first signal to be corrected and the second signal to be corrected, the adjustment subunit is configured to perform gain adjustment and phase adjustment on the second complex signal to obtain a predistortion image signal, and the correction unit is configured to determine the corrected signal according to the first complex signal and the predistortion image signal.

3. The signal correction device according to claim 1, wherein the second correction unit is configured to determine a first complex signal according to the first signal to be corrected and the second signal to be corrected, perform fourier transform on the first complex signal to obtain a frequency domain signal, perform frequency filtering on the frequency domain signal to obtain a filtered signal, and perform short-time inverse fourier transform on the filtered signal to obtain the corrected signal.

4. A signal correction method applied to the signal correction device according to any one of claims 1 to 3, the method comprising:

acquiring a first signal to be corrected and a second signal to be corrected, wherein the phase difference of the first signal to be corrected and the second signal to be corrected is 90 degrees;

acquiring radio frequency power at one or more preset frequency points within a preset signal bandwidth;

determining an interference suppression signal at a preset frequency point according to the radio frequency power, a preset gain adjustment algorithm and a preset phase algorithm;

judging the sizes of interference suppression signals under the conditions of different gain values and different phase differences;

and correcting the first signal to be corrected and the second signal to be corrected according to the judging result to obtain corrected signals.

5. The signal correction method according to claim 4, wherein said obtaining radio frequency power at one or more predetermined frequency points within a predetermined signal bandwidth comprises:

under the condition that the gating signal is a first gating value, acquiring first radio frequency power at a first frequency point in a preset signal bandwidth;

and under the condition that the gating signal is a second gating value, acquiring second radio frequency power at a first frequency point in the preset signal bandwidth.

6. The signal correction method according to claim 5, wherein said determining an interference suppression signal at a preset frequency point according to the radio frequency power, a preset gain adjustment algorithm and a preset phase algorithm comprises:

determining an amplitude difference at a first frequency point according to the first radio frequency power and the second radio frequency power;

determining a first gain value and a first phase value according to the amplitude difference, a preset gain adjustment algorithm and a preset phase algorithm;

acquiring third radio frequency power at a first frequency point and fourth radio frequency power at a second frequency point in a preset signal bandwidth under the condition that the gating signal is a third preset value; wherein the first gain value and the first phase value correspond to a third radio frequency power at a first frequency point and a fourth radio frequency power at a second frequency point;

Determining a first interference suppression signal according to the third radio frequency power and the fourth radio frequency power;

and determining a second interference suppression signal according to the first interference suppression signal and the amplitude difference.

7. The signal correction method of claim 6, wherein said determining a second interference suppression signal based on said first interference suppression signal and said amplitude difference comprises:

determining a phase difference between a first signal to be corrected and a second signal to be corrected according to the first interference suppression signal and the amplitude difference;

determining a second gain value and a second phase difference according to the phase difference, the preset gain adjustment algorithm and the preset phase algorithm;

acquiring fifth radio frequency power at a first frequency point and sixth radio frequency power at a second frequency point in a preset signal bandwidth; wherein the second gain value and the second phase value correspond to a fifth radio frequency power at the first frequency point and a sixth radio frequency power at the second frequency point;

and determining a second interference suppression signal according to the fifth radio frequency power and the sixth radio frequency power.

8. The signal correction method according to claim 7, wherein said determining the magnitude of the interference suppression signal for different gain values and different phase differences comprises:

If the second interference suppression signal is smaller than or equal to the first interference suppression signal, determining a second gain value and a second phase difference corresponding to the second interference suppression signal as target gain adjustment data and target phase adjustment data;

if the second interference suppression signal is greater than the first interference suppression signal, calculating a third gain value and a fourth gain value according to the preset gain adjustment algorithm and the preset phase algorithm, and determining the third gain value and the fourth gain value as the target gain adjustment data and the target phase adjustment data.

9. The signal correction method according to claim 8, wherein correcting the first signal to be corrected and the second signal to be corrected according to the determination result to obtain corrected signals includes:

and correcting the first signal to be corrected and the second signal to be corrected according to the target gain adjustment data and the target phase adjustment data to obtain corrected signals.

10. A radio frequency transceiver chip comprising a signal correction device as claimed in any one of claims 1 to 3.