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CN107547458B - Method, device and remote radio unit for setting image suppression parameters in IQ modulation - Google Patents

Method, device and remote radio unit for setting image suppression parameters in IQ modulation Download PDF

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CN107547458B
CN107547458B CN201610482310.0A CN201610482310A CN107547458B CN 107547458 B CN107547458 B CN 107547458B CN 201610482310 A CN201610482310 A CN 201610482310A CN 107547458 B CN107547458 B CN 107547458B
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CN107547458A (en
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王远
乔朋
陈国华
曹进
吴昊
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ZTE Corp
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Abstract

本发明公开了一种IQ调制中镜像抑制参数的设置方法、装置及射频拉远单元。其中方法包括：预设IQ调制器的IQ信号的相位偏移

Figure DDA0001032122300000011
和
Figure DDA0001032122300000012
以及获取在该
Figure DDA0001032122300000013
和
Figure DDA0001032122300000014
下，该IQ调制器的镜像泄漏信号的功率P1和P2；预设该IQ调制器的IQ信号中的I路分量和Q路分量之间的归一化幅度比G1和G2，以及获取在G1和G2下，该IQ调制器的镜像泄漏信号的功率P3和P4；获取基于该
Figure DDA0001032122300000015
Figure DDA0001032122300000016
P1和P2而得到该镜像抑制参数中的相位调整值；获取基于该G1、G2、P3和P4而得到该镜像抑制参数中的第一幅度调整值，并获取为预设值的该镜像抑制参数中的第二幅度调整值；以及将该相位调整值、该第一幅度调整值以及该第二幅度调整值设置至模数转换器DAC中，其中该DAC为该IQ调制器的前端电路。以上方式，可以减少确定镜像抑制参数时的复杂度。

Figure 201610482310

The invention discloses a method, a device and a radio frequency remote unit for setting image suppression parameters in IQ modulation. The method includes: presetting the phase offset of the IQ signal of the IQ modulator

Figure DDA0001032122300000011
and
Figure DDA0001032122300000012
and get the
Figure DDA0001032122300000013
and
Figure DDA0001032122300000014
, the powers P 1 and P 2 of the image leakage signal of the IQ modulator; the normalized amplitude ratios G 1 and G 2 between the I channel component and the Q channel component in the IQ signal of the IQ modulator are preset, And obtain under G 1 and G 2 , the power P 3 and P 4 of the image leakage signal of this IQ modulator; obtain based on the
Figure DDA0001032122300000015
Figure DDA0001032122300000016
P 1 and P 2 are used to obtain the phase adjustment value in the image rejection parameter; the first amplitude adjustment value in the image rejection parameter is obtained based on the G 1 , G 2 , P 3 and P 4 , and is obtained as a preset and setting the phase adjustment value, the first amplitude adjustment value, and the second amplitude adjustment value into an analog-to-digital converter DAC, wherein the DAC is the IQ modulation front-end circuit of the device. In the above manner, the complexity of determining the image suppression parameter can be reduced.

Figure 201610482310

Description

Method and device for setting mirror image suppression parameters in IQ modulation and radio remote unit
Technical Field
The present invention relates to the field of wireless communication technologies, and In particular, to a method and an apparatus for setting image suppression parameters In IQ (In-phase Quadrature) modulation, and a radio remote unit.
Background
Conventionally, a baseband signal is generally up-converted to a Radio frequency signal in a Remote Radio Unit (RRU), and then the Radio frequency signal is transmitted to an antenna, so as to wirelessly transmit the Radio frequency signal by using the antenna. In the process of up-converting a baseband signal into a radio frequency signal, IQ modulation needs to be performed on the baseband signal, that is, an I component and a Q component in the IQ signal are respectively modulated by using a local oscillation signal (local oscillation signal for short). However, the modulated IQ signal generally contains an image signal, which is mainly caused by the phase and amplitude imbalance between the local oscillation signal and the IQ signal. In order to suppress the image signal, it is a conventional practice to perform certain phase and amplitude processing on the IQ signal before IQ modulation, so that the modulated IQ signal can suppress the image signal. In general, predetermined phase adjustment parameters and predetermined amplitude adjustment parameters are used to adjust the phase and amplitude of the IQ signals, which requires the predetermined adjustment parameters. However, in the conventional method, when determining the phase adjustment parameter and the amplitude adjustment parameter, the power of the leakage signal needs to be tested repeatedly (for example, the number of tests may reach more than 30) under different adjustment parameters, and then the appropriate phase adjustment parameter and amplitude adjustment parameter can be determined. Therefore, the prior art needs to improve the complexity of determining the phase adjustment parameter and the amplitude adjustment parameter.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method and an apparatus for setting mirror image suppression parameters in IQ modulation, and a radio remote unit, so as to reduce the complexity in determining the mirror image suppression parameters.
To solve the above technical problem, an embodiment of the present invention provides a method for setting mirror image suppression parameters in IQ modulation, including: presetting the phase offset of IQ signal of IQ modulator
Figure BDA0001032122280000022
And
Figure BDA0001032122280000023
and is obtained at
Figure BDA0001032122280000024
And
Figure BDA0001032122280000025
the power P of the mirror leakage signal of the IQ modulator1And P2(ii) a Presetting a normalized amplitude ratio G between an I-path component and a Q-path component in an IQ signal of the IQ modulator1And G2And is obtained at G1And G2The power P of the mirror leakage signal of the IQ modulator3And P4(ii) a Acquisition is based on
Figure BDA0001032122280000026
Figure BDA0001032122280000027
P1And P2Obtaining a phase adjustment value in the image rejection parameter; acquisition is based on this G1、G2、P3And P4Obtaining a first amplitude adjustment value in the image rejection parameter, and obtaining a second amplitude adjustment value in the image rejection parameter which is a preset value; and setting the phase adjustment value, the first amplitude adjustment value and the second amplitude adjustment value into an analog-to-digital converter (DAC), wherein the DAC is a front-end circuit of the IQ modulator.
Wherein the obtaining is based on
Figure BDA0001032122280000028
P1And P2To obtain the mirror imageSuppressing phase adjustment values in the parameters, comprising: acquisition is based on
Figure BDA0001032122280000029
P1And P2Obtaining the quadrature phase error between the I path component and the Q path component of the local oscillation signal used in the in-phase quadrature IQ modulator; the phase adjustment value obtained based on a quadrature phase error between an I-path component and a Q-path component of the local oscillation signal is acquired.
Wherein the obtaining is based on
Figure BDA00010321222800000210
P1And P2The obtained quadrature phase error between the I-path component and the Q-path component of the local oscillation signal used in the in-phase quadrature IQ modulator comprises: the acquisition is based on the formula:
Figure BDA0001032122280000021
and the quadrature phase error theta between the I-path component and the Q-path component of the local oscillation signal is obtained.
Wherein the obtaining the phase adjustment value obtained based on a quadrature phase error between an I-path component and a Q-path component of the local oscillation signal comprises: obtaining according to the formula:
Figure BDA0001032122280000031
the resulting phase adjustment value qmc _ phaseAB, where,
Figure BDA0001032122280000033
is a quadrature phase error between an I-path component and a Q-path component of an IQ signal supplied to the IQ modulator, and
Figure BDA0001032122280000034
equal to the quadrature phase error between the I and Q components, where qmc _ phaseAB is the phase adjustment value.
Wherein the quadrature phase error comprises: a first quadrature phase error and a second quadrature phase error; the obtaining the phase adjustment value obtained based on the quadrature phase error between the I-path component and the Q-path component of the local oscillation signal includes: obtaining a first phase adjustment value and a second phase adjustment value which are obtained respectively based on the first quadrature phase error and the second quadrature phase error; acquiring a first leakage power value and a second leakage power value of the mirror image leakage signal of the IQ modulator corresponding to the first phase adjustment value and the second phase adjustment value; and acquiring a phase adjustment value corresponding to the smaller one of the first leakage power value and the second leakage power value, and taking the phase adjustment value as the phase adjustment value finally set to the DAC.
Wherein the obtaining is based on the G1、G2、P3And P4And obtaining a first amplitude adjustment value in the image rejection parameter, including: acquisition is based on this G1、G2、P3And P4Obtaining the normalized amplitude ratio between the I-path component and the Q-path component of the local oscillation signal used in the IQ modulator; the first amplitude adjustment value obtained based on a normalized amplitude ratio between an I-path component and a Q-path component of the local oscillation signal is obtained.
Wherein the obtaining is based on the G1、G2、P3And P4The obtained normalized amplitude ratio between the I-path component and the Q-path component of the local oscillation signal used in the IQ modulator comprises: the acquisition is based on the formula:
Figure BDA0001032122280000032
and obtaining the normalized amplitude ratio A between the I-path component and the Q-path component of the local oscillation signal.
Wherein the obtaining the first amplitude adjustment value obtained based on the normalized amplitude ratio between the I-path component and the Q-path component of the local oscillation signal includes: the acquisition is based on the formula: qmc _ gainA is a · 1024, and the first amplitude adjustment value qmc _ gainA is obtained.
Wherein the normalized amplitude ratio between the I-path component and the Q-path component of the local oscillation signal comprises: a first normalized amplitude ratio and a second normalized amplitude ratio; respectively obtaining a third amplitude adjustment value and a fourth amplitude adjustment value corresponding to the first normalized amplitude ratio and the second normalized amplitude ratio; respectively acquiring a first leakage power value and a second leakage power value of the mirror image leakage signal in the IQ modulator corresponding to the third amplitude adjustment value and the fourth amplitude adjustment value; a corresponding amplitude adjustment value for the lesser of the first and second leakage power values is obtained and is used as the first amplitude adjustment value that is ultimately set to the DAC.
Wherein the preset value is 1024.
An embodiment of the present invention further provides a setting apparatus, configured to set a mirror image suppression parameter used in IQ modulation, including: a first processing module for presetting the phase offset of IQ signal of IQ modulator
Figure BDA0001032122280000041
And
Figure BDA0001032122280000042
and is obtained at
Figure BDA0001032122280000043
And
Figure BDA0001032122280000044
the power P of the mirror leakage signal of the IQ modulator1And P2(ii) a A second processing module for presetting a normalized amplitude ratio G between the I-path component and the Q-path component in the IQ signal of the IQ modulator1And G2And is obtained at G1And G2The power P of the mirror leakage signal of the IQ modulator3And P4(ii) a And a third processing module for obtaining a data stream based on the data stream
Figure BDA0001032122280000045
P1And P2Obtaining a phase adjustment value in the image rejection parameter; a fourth processing module for obtaining a signal based on the G1、G2、P3And P4Obtaining a first amplitude adjustment value in the image rejection parameter, and obtaining the image with a preset valueA second amplitude adjustment value in the suppression parameter; and a setting module, configured to set the phase adjustment value, the first amplitude adjustment value, and the second amplitude adjustment value to a DAC, where the DAC is a front-end circuit of the IQ modulator.
The third processing module is specifically configured to: a first obtaining unit for obtaining the data based on the
Figure BDA0001032122280000046
P1And P2Obtaining the quadrature phase error between the I path component and the Q path component of the local oscillation signal used in the in-phase quadrature IQ modulator; and a second acquisition unit configured to acquire the phase adjustment value obtained based on a quadrature phase error between the I-path component and the Q-path component of the local oscillation signal.
The first obtaining unit is specifically configured to obtain, according to a formula:
Figure BDA0001032122280000051
and the quadrature phase error theta between the I-path component and the Q-path component of the local oscillation signal is obtained.
The second obtaining unit is specifically configured to obtain, according to a formula:
Figure BDA0001032122280000053
the resulting phase adjustment value qmc _ phaseAB, where,
Figure BDA0001032122280000054
is a quadrature phase error between an I-path component and a Q-path component of an IQ signal supplied to the IQ modulator, and
Figure BDA0001032122280000055
equal to the quadrature phase error between the I and Q components.
Wherein the quadrature phase error comprises: a first quadrature phase error and a second quadrature phase error; the second obtaining unit is specifically configured to: obtaining a first phase adjustment value and a second phase adjustment value which are obtained respectively based on the first quadrature phase error and the second quadrature phase error; acquiring a first leakage power value and a second leakage power value of the mirror image leakage signal of the IQ modulator corresponding to the first phase adjustment value and the second phase adjustment value; and acquiring a phase adjustment value corresponding to the smaller one of the first leakage power value and the second leakage power value, and taking the phase adjustment value as the phase adjustment value finally set to the DAC.
Wherein, the fourth processing module comprises: a third acquisition unit for acquiring the data based on the G1、G2、P3And P4Obtaining the normalized amplitude ratio between the I-path component and the Q-path component of the local oscillation signal used in the IQ modulator; and a fourth acquisition unit configured to acquire the first amplitude adjustment value obtained based on a normalized amplitude ratio between the I-path component and the Q-path component of the local oscillation signal.
The third obtaining unit is specifically configured to obtain a formula-based:
Figure BDA0001032122280000052
and obtaining the normalized amplitude ratio A between the I-path component and the Q-path component of the local oscillation signal.
The fourth obtaining unit is specifically configured to obtain a formula-based: qmc _ gainA is a · 1024, and the first amplitude adjustment value qmc _ gainA is obtained.
Wherein the normalized amplitude ratio between the I-path component and the Q-path component of the local oscillation signal comprises: a first normalized amplitude ratio and a second normalized amplitude ratio; the fourth obtaining unit is specifically configured to: respectively obtaining a third amplitude adjustment value and a fourth amplitude adjustment value corresponding to the first normalized amplitude ratio and the second normalized amplitude ratio; respectively acquiring a first leakage power value and a second leakage power value of the mirror image leakage signal in the IQ modulator corresponding to the third amplitude adjustment value and the fourth amplitude adjustment value; a corresponding amplitude adjustment value for the lesser of the first and second leakage power values is obtained and is used as the first amplitude adjustment value that is ultimately set to the DAC.
An embodiment of the present invention further provides a remote radio unit, including: the digital-to-analog converter comprises an IQ modulator, a DAC and the setting device, wherein the DAC is connected with the IQ modulator and is used for transmitting a baseband signal to the IQ modulator for IQ modulation after the baseband signal is processed; wherein, this DAC includes: the phase adjustment register, the first gain adjustment register and the second gain adjustment register; and the setting device is used for setting the phase adjustment value of the phase adjustment register, the first amplitude adjustment value of the first gain adjustment register and the second amplitude adjustment value of the second gain adjustment register.
The invention has the beneficial effects that:
the method, the apparatus and the remote radio unit utilize the predetermined phase offset of the IQ signal of the IQ modulator
Figure BDA0001032122280000061
And
Figure BDA0001032122280000062
and the power of its corresponding image leakage signal; and a preset normalized amplitude ratio G between the I-path component and the Q-path component in the IQ signal of the IQ modulator1And G2And the power of the image leakage signal corresponding to the phase adjustment value and the amplitude adjustment value are obtained, so that the test times for determining the image rejection parameter can be simplified, and the complexity for determining the image rejection parameter is reduced.
Drawings
Fig. 1 is a schematic diagram of IQ modulation principles according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating image rejection by a DAC according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating a method for setting mirror image suppression parameters in IQ modulation according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a setting device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an embodiment of a third processing module shown in FIG. 4;
FIG. 6 is a block diagram of an embodiment of a fourth processing module of FIG. 4; and
fig. 7 is a schematic structural diagram of a remote radio unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
In the embodiment of the present invention, the principle of IQ modulation may be referred to as shown in fig. 1. The principle of IQ modulation of the embodiment of the present invention is: the IQ signal can inhibit local oscillation (local oscillation) leakage and image signals of the signal after being modulated by the IQ modulator, and only a desired single sideband signal is reserved. A simplified block diagram of IQ modulation is shown in fig. 1, where signals i (t) and q (t) are the in-phase and quadrature components of the IQ signal, respectively, and signals i (t) and q (t) are themselves in quadrature. The local oscillator signal LO passes through a 90 ° phase shifter 103 to produce two orthogonal signals cos (ω)LOt) and sin (ω)LOt) which are mixed with i (t) and q (t), respectively, and then combined, for example, by multipliers 101 and 102, and then combined by adder 103 to obtain rf signal fo(t)。
The principle of IQ modulation is explained below from the signal point of view, assuming that the IQ signals are respectively represented as follows:
Figure BDA0001032122280000071
ideally, the signals I (t) and Q (t) are orthogonal, and the I component f _ (LO _ I (t)) and Q component f _ (LO _ Q (t)) of the local oscillator signal LO are also completely orthogonal. However, in practical situations, there are amplitude and phase imbalances and dc offset errors in the i (t), q (t), and f _ (LO _ i (t)), f _ (LO _ q (t)), so that the IQ signal cannot suppress the image signal after IQ modulation, and as a result, the spurious level of the rf signal output by the RRU (radio remote unit) cannot pass the test requirement at the frequency point of the image signal.
Since the image signal is caused by the imbalance of the amplitudes and phases of the IQ signal and the local oscillator signal, the suppression of the image signal also needs to be achieved by adjusting the amplitudes and phases of the IQ signal and the local oscillator signal. In general, the amplitude and phase of the quadrature local oscillator signal of the IQ modulator are limited by hardware circuit implementation and cannot be adjusted. The IQ signal injected into the IQ modulator is generated by a DAC (Digital to Converter), and its amplitude and phase are adjustable. Therefore, by adjusting the IQ signal in the DAC, suppression of the mirror signal can be achieved. Therefore, the suppression of the mirror image signal can carry out error compensation on the IQ signal entering the IQ modulator in advance through a DAC chip at the front end of the IQ modulator, thereby suppressing the mirror image signal.
Specifically, before the IQ signal passes through the IQ Modulator, the DAC converts the baseband signal into two IQ analog high-intermediate frequency signals, and a QMC (Quadrature modulation Correction) chip in the DAC chip is used to perform image rejection. The structure of the DAC can be shown in fig. 2, where QMC includes three parts: an I-path QMC gain register (QMC _ GA)205, a Q-path QMC gain register (QMC _ GB)207, and a phase adjustment register (QMC _ PAB) 206. The I-path QMC gain register 205 and the Q-path QMC gain register 207 are used to adjust the amplitude imbalance, and the phase adjustment register 206 is used to adjust the phase imbalance. By reasonably and correctly setting the I-path QMC gain register 205, the Q-path QMC gain register 207 and the phase adjusting register 206 in the DAC, the imbalance of the amplitude and the phase of the signal in the IQ modulation process and the DC offset error can be compensated.
As shown in fig. 2, both the I-way QMC gain register 205 and the Q-way QMC gain register 207 are 11-bit 2-ary registers, where 1 bit is the sign bit and the phase adjustment register 206 is a 12-bit 2-ary register. In one embodiment, the values of the three registers may be set multiple times in a dichotomy in the IQ rejection adjustment, and the power of the image leakage signal is read from the test meter each time the setting is made. The value of the next setting register is the middle value of the last two setting values with lower mirror image leakage signal power until the mirror image leakage signal power of the mirror image point meets the design requirement after a certain setting, and then three values of the I path gain adjustment value, the Q path gain adjustment value and the phase adjustment value found in the last setting are written into corresponding registers. Then, in practical applications, the I-path component (a) in the baseband signal is multiplied by the value of the I-path QMC gain register 205 in the multiplier 201, and then output to the adder 204 for combining, and then the compensated I-path component (C) is output. The Q-path component (B) of the baseband signal is multiplied by the value of the Q-path QMC gain register 207 in the multiplier 202, and then the compensated Q-path signal (D) is output, and the Q-path component (B) is multiplied by the phase adjustment value of the phase adjustment register 206 in the multiplier 203, and then the result is input to the adder 204 for combining.
However, the determination of the IQ suppression parameters is time-consuming and inefficient because the number of settings and tests is too large, and satisfactory results are generally obtained only by at least 30 tests.
Therefore, another way of determining the image suppression parameters in IQ modulation can be referred to below, and first to facilitate understanding of the present invention by those skilled in the art, the principle of this way will be explained.
The first step is as follows: the relationship of the leaked image signal to the amplitude and phase is calculated.
Ideally, the signals I (t), Q (t) are orthogonal, and the local oscillator signal fLO_I(t)、fLO_Q(t)And are also completely orthogonal. However, in practice, I (t), Q (t) and fLO_I(t)、fLO_Q(t)The signal always has amplitude and phase imbalance and DC offset error.
To facilitate the analysis of the problem, assume the actual signals I (t), Q (t), and fLO_I(t)、fLO_Q(t)Respectively as follows:
Figure BDA0001032122280000091
in the formula, G represents,
Figure BDA0001032122280000092
d is normalized amplitude ratio, quadrature phase error and direct current offset error between I (t) and Q (t) signals respectively; a, theta, E are each fLO_I(t)、fLO_Q(t)Normalized amplitude ratio between signals, quadrature phase error, and dc offset error. Ideally, a-G-1,
Figure BDA0001032122280000105
D＝E＝0。
wherein the output signal f of the IQ modulator0(t) can be expressed as:
Figure BDA0001032122280000101
equation 3 is a mathematical expression of the channel model of the IQ calibration channel. In the above formula, the first and second carbon atoms are,
Figure BDA0001032122280000102
is the wanted upper sideband modulated signal fHSB(t)，
Figure BDA0001032122280000103
Is a leaked lower sideband unwanted signal fLSB(t)，
DAcos(ωct+θ)
Is a leaked local oscillator signal.
EG cos(ωt+θ)+ED
Are the direct current component of the leakage and the low frequency component.
Leaked lower sideband unwanted signal fLSB(t) is the leaked image signal, which can be known from equation 3
Figure BDA0001032122280000104
Equation 4 is an expression for calculating the amplitude and phase of the leaked image signal, where:
Figure BDA0001032122280000111
r in equation 5LSBIs the amplitude of the image signal, phiLSBIs the phase of the image signal. It can be seen that the unwanted sidebands are due to amplitude and phase imbalance of the IQ signal and the quadrature local oscillator signal.
The second step is that: determining a phase adjustment value required for image rejection
If the image leakage signal is to be eliminated, only the amplitude R of the image signal is requiredLSBIt is sufficient if 0.
Since the imbalance of the phase has a significant effect on the image rejection, it is assumed that the imbalance of the amplitude is negligible, i.e. the value of A, G enables AG- > 1.
Substituting AG 1 into equation 5, we get the amplitude equation of the image signal:
Figure BDA0001032122280000112
the output image signal energy can be seen
Figure BDA0001032122280000113
It is related.
Since energy is proportional to the square of the amplitude, the power of the image signal can be expressed by equation 7:
Figure BDA0001032122280000114
wherein R is a fixed coefficient.
It is assumed that the phases of the IQ signals are respectively set so that the corresponding phase shifts are respectively
Figure BDA0001032122280000115
Phase shift
Figure BDA0001032122280000116
And
Figure BDA0001032122280000117
the power of the corresponding image leakage signal can be measured and measured, and is set as P1And P2Formula 8 can be obtained by substituting formula 7:
Figure BDA0001032122280000121
solving equation 8 can yield fLO_I(t)、fLO_Q(t)Quadrature phase error between signals, equation 9:
Figure BDA0001032122280000122
according to equation 6, in order to make the amplitude R of the image signal LSB0, the following equation 10 can be obtained:
Figure BDA0001032122280000123
and thirdly, qmc _ phaseAB is calculated according to the DAC image suppression realization method.
The process of adjusting image rejection in a DAC is. There is a QMC in the DAC to perform image rejection. QMC comprises three parts: an I-way QMC gain register, a Q-way QMC gain register, and a phase adjustment register, for example, as shown in fig. 2. The I-path QMC gain register and the Q-path QMC gain register are used for adjusting amplitude imbalance, and the phase adjusting register is used for adjusting phase imbalance. The gain adjustment is a multiplier and the phase adjustment is performed by multiplying the Q-path signal by a coefficient and adding the multiplied signal to the I-path signal, which is noted to cause a change in the amplitude of the I-path signal, so that the amplitude effect is negligible when the coefficient is small enough and is not negligible when the coefficient is large.
The principle of phase adjustment is to multiply the signal of the Q path by a coefficient x and add it to the I path, as shown below.
Figure BDA0001032122280000124
Cos α and sin α in equation 11 are expressions of a pair of quadrature modulated signals. And x is a coefficient for regulating the Q-path signal. The influence of the coefficient x on the phase and amplitude can be seen.
Since the coefficient x is small in value, x2Towards 0, equation 11 can be expressed as
cos α + x sin α ═ cos (α -arctan x) (equation 12)
From equation 12, the phase shift generated by the coefficient x
γ ═ arctan x (equation 13)
According to the DAC implementation principle:
Figure BDA0001032122280000131
where γ is the phase shift, i.e. in equation 2
Figure BDA0001032122280000132
phase is the value of phase adjust register qmc _ phaseAB.
Transform equation 14 and calculate from equation 10
Figure BDA0001032122280000133
After the values are substituted, the value qmc _ phaseAB of the register is obtained as:
Figure BDA0001032122280000134
the phase adjustment value required for image rejection can be obtained.
Because of the fact thatObtained by
Figure BDA0001032122280000137
The process can obtain two phase adjustment values. Therefore, the test can be set twice under the two phase adjustment values respectively, and the phase adjustment value with the lower leakage power value of the image leakage signal is taken as the optimal phase adjustment value and is set to the DAC.
The fourth step: and solving the amplitude adjustment value of image rejection.
Substituting equation 10 into equation 5 reduces to the following equation.
Figure BDA0001032122280000135
Since the energy is proportional to the square of the amplitude, the equation 15 is used to obtain
Figure BDA0001032122280000136
Wherein R is a fixed coefficient.
Similarly, let two amplitudes be G1、G2With the corresponding mirror leakage signal measured as P3、P4Substituting into equation 16 then yields the equation
Figure BDA0001032122280000141
Solving equation 17 yields:
Figure BDA0001032122280000142
according to the DAC implementation principle:
qmc _ gainA ═ a 1024 (equation 19)
The amplitude adjustment value of the I-path signal can be obtained by substituting the value obtained by equation 18 into equation 19.
Since the obtained a is positive and negative values, equation 19 can obtain two amplitude adjustment values, and then the power values of the image leakage signal can be tested at the two amplitude adjustment values, respectively, and then the amplitude adjustment value of one of the image leakage signal and the leakage power value lower is taken as the amplitude adjustment value of the I-path signal and set to the DAC.
In addition, the amplitude adjustment value of the Q-path signal may be set such that the gain is 1, i.e., 1024. The values of all three registers in the DAC are now available.
Then, the three values are set in corresponding registers in the DAC, so that IQ image rejection of the RRU can reach a better level, and spurious indexes of corresponding frequency points are also better.
The principle of the present invention is explained above, and the method and apparatus for setting the mirror suppression parameter in IQ modulation according to the present invention are explained below.
Please refer to fig. 3, which is a flowchart illustrating a method for setting mirror image suppression parameters in IQ modulation according to an embodiment of the present invention. It includes:
step 31: presetting the phase offset of IQ signal of IQ modulator
Figure BDA0001032122280000151
And
Figure BDA0001032122280000152
and is obtained at
Figure BDA0001032122280000153
And
Figure BDA0001032122280000154
the power P of the mirror leakage signal of the IQ modulator1And P2。
Step 32: presetting a normalized amplitude ratio G between an I-path component and a Q-path component in an IQ signal of the IQ modulator1And G2And is obtained at G1And G2The power P of the mirror leakage signal of the IQ modulator3And P4。
Step 33: acquisition is based on
Figure BDA0001032122280000155
P1And P2And a phase adjustment value in the image rejection parameter is obtained.
Step 34: acquisition is based on this G1、G2、P3And P4And obtaining a first amplitude adjustment value in the image rejection parameter, and obtaining a second amplitude adjustment value in the image rejection parameter which is a preset value. And
step 35: the phase adjust value qmc _ phaseAB, the first amplitude adjust value qmc _ gainA, and the second amplitude adjust value qmc _ gainB are set to an analog-to-digital converter DAC, wherein the DAC is a front-end circuit of the IQ modulator.
Wherein, in step 31, the phase offsets of the IQ signals input to the IQ modulator can be respectively set to
Figure BDA0001032122280000156
And
Figure BDA0001032122280000157
then testing at the same time
Figure BDA0001032122280000158
And
Figure BDA0001032122280000159
the power P of the mirror leakage signal of the IQ modulator1And P2(ii) a Finally according to P1And P2The quadrature phase error θ is calculated. Specifically, in calculating the quadrature phase error θ, the aforementioned formula (9) may be employed.
Here, in step 33, the aforementioned formula (10) and formula (14) may be adopted to calculate the phase adjustment value qmc _ phaseAB in the image rejection parameter.
As can be seen from equation (9), the quadrature phase error θ may include: first quadrature phase error theta1And a second quadrature phase error theta2. Then, at this point, the first quadrature phase error θ may be based1And a second quadrature phase error theta2Respectively calculating phase adjustment values to obtain a first phase adjustment value and a second phase adjustment value; then setting the first phase adjustment value and the second phase adjustment value to the DAC respectively, and then testing and obtaining the leakage power value of the mirror image leakage signal of the IQ modulator respectively to obtain a first leakage power value and a second leakage power value; and finally, taking the phase adjustment value corresponding to the smaller one of the first leakage power value and the second leakage power value as the phase adjustment value finally set to the DAC.
In steps 32 and 34, the IQ signal to the IQ modulator may be set such that the normalized amplitude ratio between the I-path component and the Q-path component in the IQ signal is G1And G2(ii) a Then at G1And G2Then, the power of the mirror leakage signal of the IQ modulator is respectively tested to obtain the power P3And P4(ii) a Finally according to G1、G2And P3And P4And calculating the normalized amplitude ratio A. Specifically, the normalized amplitude ratio a may be calculated by the aforementioned equation (17).
In step 34, the first amplitude adjustment value qmc _ gainA may be calculated according to the aforementioned formula (18), and then the second amplitude adjustment value qmc _ gainB is set to 1024.
Specifically, as shown in equation (17), the normalized amplitude ratio a may include: a first normalized amplitude ratio a1 and a second normalized amplitude ratio a 2. Then, the first amplitude adjustment value qmc _ gainA calculated according to a1 and a2 may be set to the DAC, respectively, and then the leakage power values of the mirror leakage signals in the IQ modulator may be tested, respectively, to obtain a first leakage power value corresponding to a1 and a second leakage power value corresponding to a 2; finally, the corresponding first amplitude adjustment value qmc _ gainA for the smaller of the first and second leakage power values is taken as the first amplitude adjustment value that is ultimately set to the DAC.
The method greatly reduces the times of testing the image leakage signal power, for example, eight times of tests can calculate the reasonable setting values of the DAC image suppression adjusting registers qmc _ gainA, qmc _ gainB and qmc _ phaseAB, thereby completing the adjustment of the image suppression parameters.
Fig. 4 is a schematic structural diagram of an embodiment of the setting device for mirror suppression parameters in IQ modulation according to the present invention. It includes:
a first processing module 41 for presetting the phase offset of the IQ signal of the IQ modulator
Figure BDA0001032122280000161
And
Figure BDA0001032122280000162
and is obtained at
Figure BDA0001032122280000171
And
Figure BDA0001032122280000172
the power P of the mirror leakage signal of the IQ modulator1And P2。
A second processing module 42 for presetting a normalized amplitude ratio G between the I-path component and the Q-path component in the IQ signal of the IQ modulator1And G2And is obtained at G1And G2The power P of the mirror leakage signal of the IQ modulator3And P4。
A third processing module 43 for obtaining a value based thereon
Figure BDA0001032122280000173
P1And P2And a phase adjustment value in the image rejection parameter is obtained.
A fourth processing module 44 for obtaining a signal based on the G1、G2、P3And P4And obtaining a first amplitude adjustment value in the image rejection parameter, and obtaining a second amplitude adjustment value in the image rejection parameter which is a preset value.
A setting module 45, configured to set the phase adjustment value qmc _ phaseAB, the first amplitude adjustment value qmc _ gainA and the second amplitude adjustment value qmc _ gainB to an analog-to-digital converter DAC, wherein the DAC is a front-end circuit of the IQ modulator.
As shown in fig. 5, the third processing module 43 specifically includes: a first obtaining unit 431 for obtaining the data based on the
Figure BDA0001032122280000174
P1And P2Obtaining the quadrature phase error between the I path component and the Q path component of the local oscillation signal used in the in-phase quadrature IQ modulator; and a second acquisition unit 432 for acquiring the phase adjustment value obtained based on a quadrature phase error between the I-path component and the Q-path component of the local oscillation signal.
In addition, from the previous analysis, the quadrature phase error θ acquired by the first acquiring unit 431 may include: first quadrature phase error theta1And a second quadrature phase error theta2. Therefore, the second obtaining unit 432 may obtain a first phase adjustment value and a second phase adjustment value obtained based on the first quadrature phase error and the second quadrature phase error, respectively; acquiring a first leakage power value and a second leakage power value of the mirror image leakage signal of the IQ modulator corresponding to the first phase adjustment value and the second phase adjustment value; and acquiring a phase adjustment value corresponding to the smaller one of the first leakage power value and the second leakage power value, and taking the phase adjustment value as the phase adjustment value finally set to the DAC.
As shown in fig. 6, the fourth processing module 44 includes: a third obtaining unit 441 for obtaining a value based on the G1、G2、P3And P4Obtaining the normalized amplitude ratio between the I-path component and the Q-path component of the local oscillation signal used in the IQ modulator; and a fourth obtaining unit 442 for obtaining the first amplitude adjustment value based on the normalized amplitude ratio between the I-path component and the Q-path component of the local oscillation signal.
As can be seen from the foregoing, the normalized amplitude ratio a acquired by the third acquisition unit 441 includes: a first normalized amplitude ratio a1 and a second normalized amplitude ratio a 2. Therefore, the fourth obtaining unit 442 may obtain a third amplitude adjustment value and a fourth amplitude adjustment value corresponding to the first normalized amplitude ratio and the second normalized amplitude ratio, respectively; respectively acquiring a first leakage power value and a second leakage power value of the mirror image leakage signal in the IQ modulator corresponding to the third amplitude adjustment value and the fourth amplitude adjustment value; and obtaining a corresponding amplitude adjustment value of the smaller one of the first leakage power value and the second leakage power value as the first amplitude adjustment value finally set to the DAC.
Fig. 7 is a schematic structural diagram of an embodiment of a remote radio unit according to the present invention, where the remote radio unit includes: an IQ modulator 100, a DAC200 and a setting device 300, wherein the DAC200 is connected to the IQ modulator 100, and is configured to process a baseband signal and transmit the processed baseband signal to the IQ modulator for IQ modulation. The DAC200 may include: a phase adjustment register 202, a first gain adjustment register 201, and a second gain adjustment register 203; and the setting means 300 may be used to set the values in the phase adjustment register, the first gain adjustment register and the second gain adjustment register in the DAC. Wherein, the specific structure of the IQ modulator 100 can be as shown in fig. 1, the specific structure of the DAC200 can be as shown in fig. 2, and the structure of the setting apparatus 300 can be as shown in fig. 4.
In the above embodiments, the number of times of testing the power of the image leakage signal can be greatly reduced, for example, the phase adjustment value and the two gain adjustment values in the DAC can be set by testing the power value of the image leakage signal for eight times.
It should be noted that all modules related to the present invention are logic modules, and in practical applications, one logic unit may be one physical unit, may also be a part of one physical unit, and may also be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
It will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (21)

1.一种IQ调制中镜像抑制参数的设置方法，其特征在于，包含：1. a method for setting up image suppression parameters in IQ modulation, is characterized in that, comprises: 预设IQ调制器的IQ信号的相位偏移
Figure FDA0002931641700000012
和
Figure FDA0002931641700000013
以及获取在该
Figure FDA0002931641700000014
和
Figure FDA0002931641700000015
下，该IQ调制器的镜像泄漏信号的功率P1和P2；Preset the phase offset of the IQ signal of the IQ modulator
Figure FDA0002931641700000012
and
Figure FDA0002931641700000013
and get the
Figure FDA0002931641700000014
and
Figure FDA0002931641700000015
, the powers P 1 and P 2 of the image leakage signal of the IQ modulator; 预设该IQ调制器的IQ信号中的I路分量和Q路分量之间的归一化幅度比G1和G2，以及获取在G1和G2下，该IQ调制器的镜像泄漏信号的功率P3和P4；Preset the normalized amplitude ratios G 1 and G 2 between the I channel component and the Q channel component in the IQ signal of the IQ modulator, and obtain the image leakage signal of the IQ modulator under G 1 and G 2 The powers P 3 and P 4 ; 获取基于该
Figure FDA0002931641700000016
P1和P2而得到该镜像抑制参数中的相位调整值；get based on the
Figure FDA0002931641700000016
P 1 and P 2 to obtain the phase adjustment value in the image rejection parameter; 获取基于该G1、G2、P3和P4而得到该镜像抑制参数中的第一幅度调整值，并获取为预设值的该镜像抑制参数中的第二幅度调整值；以及obtaining a first amplitude adjustment value in the image suppression parameter obtained based on the G 1 , G 2 , P 3 and P 4 , and obtaining a second amplitude adjustment value in the image suppression parameter as a preset value; and 将该相位调整值、该第一幅度调整值以及该第二幅度调整值设置至模数转换器DAC中，其中该DAC为该IQ调制器的前端电路。The phase adjustment value, the first amplitude adjustment value and the second amplitude adjustment value are set in an analog-to-digital converter DAC, wherein the DAC is a front-end circuit of the IQ modulator. 2.根据权利要求1所述的IQ调制中镜像抑制参数的设置方法，其特征在于，所述获取基于该
Figure FDA0002931641700000017
P1和P2而得到该镜像抑制参数中的相位调整值，包括：2. The method for setting image suppression parameters in IQ modulation according to claim 1, wherein the acquisition is based on the
Figure FDA0002931641700000017
P 1 and P 2 to obtain the phase adjustment value in the image rejection parameter, including: 获取基于该
Figure FDA0002931641700000018
P1和P2而得到的同相正交IQ调制器中使用的本地振荡信号的I路分量和Q路分量之间的正交相位误差；get based on the
Figure FDA0002931641700000018
The quadrature phase error between the I-path component and the Q-path component of the local oscillation signal used in the in-phase quadrature IQ modulator obtained from P 1 and P 2 ; 获取基于该本地振荡信号的I路分量和Q路分量之间的正交相位误差而得到的该相位调整值。The phase adjustment value obtained based on the quadrature phase error between the I-path component and the Q-path component of the local oscillation signal is acquired. 3.根据权利要求2所述的IQ调制中镜像抑制参数的设置方法，其特征在于，所述获取基于该
Figure FDA0002931641700000019
P1和P2而得到的同相正交IQ调制器中使用的本地振荡信号的I路分量和Q路分量之间的正交相位误差，包括：获取基于公式：
Figure FDA0002931641700000011
而得到的该本地振荡信号的I路分量和Q路分量之间的正交相位误差θ。3. The method for setting image suppression parameters in IQ modulation according to claim 2, wherein the acquisition is based on the
Figure FDA0002931641700000019
The quadrature phase error between the I-channel component and the Q-channel component of the local oscillator signal used in the in-phase quadrature IQ modulator obtained by P 1 and P 2 includes: Obtaining based on the formula:
Figure FDA0002931641700000011
The obtained quadrature phase error θ between the I channel component and the Q channel component of the local oscillation signal. 4.根据权利要求2所述的IQ调制中镜像抑制参数的设置方法，其特征在于，所述获取基于该本地振荡信号的I路分量和Q路分量之间的正交相位误差而得到的该相位调整值，包括：4. The method for setting image suppression parameters in IQ modulation according to claim 2, wherein the acquisition is based on the quadrature phase error between the I channel component and the Q channel component of the local oscillation signal. Phase adjustment values, including: 获取根据公式：
Figure FDA0002931641700000021
而得到的该相位调整值qmc_phase，其中，
Figure FDA0002931641700000022
为输至该IQ调制器的IQ信号的I路分量和Q路分量之间的正交相位误差，且
Figure FDA0002931641700000023
等于该I路分量和Q路分量之间的正交相位误差，其中qmc_phaseAB为该相位调整值。Get according to the formula:
Figure FDA0002931641700000021
And the obtained phase adjustment value qmc_phase, where,
Figure FDA0002931641700000022
is the quadrature phase error between the I component and the Q component of the IQ signal input to the IQ modulator, and
Figure FDA0002931641700000023
It is equal to the quadrature phase error between the I channel component and the Q channel component, where qmc_phaseAB is the phase adjustment value. 5.根据权利要求2所述的IQ调制中镜像抑制参数的设置方法，其特征在于，该正交相位误差包括：第一正交相位误差及第二正交相位误差；5. The method for setting image suppression parameters in IQ modulation according to claim 2, wherein the quadrature phase error comprises: a first quadrature phase error and a second quadrature phase error; 所述获取基于该本地振荡信号的I路分量和Q路分量之间的正交相位误差而得到的该相位调整值，包括：The obtaining of the phase adjustment value obtained based on the quadrature phase error between the I channel component and the Q channel component of the local oscillation signal includes: 获取分别基于该第一正交相位误差及第二正交相位误差而得到的第一相位调整值和第二相位调整值；acquiring a first phase adjustment value and a second phase adjustment value obtained based on the first quadrature phase error and the second quadrature phase error, respectively; 获取该第一相位调整值和该第二相位调整值对应的该IQ调制器的镜像泄漏信号的第一泄漏功率值和第二泄漏功率值；acquiring a first leakage power value and a second leakage power value of the image leakage signal of the IQ modulator corresponding to the first phase adjustment value and the second phase adjustment value; 获取该第一泄漏功率值和第二泄漏功率值中较小一个对应的相位调整值，并作为最终设置至该DAC的相位调整值。The phase adjustment value corresponding to the smaller one of the first leakage power value and the second leakage power value is acquired, and used as the phase adjustment value finally set to the DAC. 6.根据权利要求1所述的IQ调制中镜像抑制参数的设置方法，其特征在于，所述获取基于该G1、G2、P3和P4而得到该镜像抑制参数中的第一幅度调整值，包括：6 . The method for setting image suppression parameters in IQ modulation according to claim 1 , wherein the obtaining is based on the G 1 , G 2 , P 3 and P 4 to obtain the first amplitude in the image suppression parameters. 7 . Adjustment values, including: 获取基于该G1、G2、P3和P4而得到的该IQ调制器中使用的本地振荡信号的I路分量和Q路分量之间的归一化幅度比；Obtaining the normalized amplitude ratio between the I channel component and the Q channel component of the local oscillation signal used in the IQ modulator based on the G 1 , G 2 , P 3 and P 4 ; 获取基于该本地振荡信号的I路分量和Q路分量之间的归一化幅度比而得到的该第一幅度调整值。The first amplitude adjustment value obtained based on the normalized amplitude ratio between the I channel component and the Q channel component of the local oscillation signal is acquired. 7.根据权利要求6所述的IQ调制中镜像抑制参数的设置方法，其特征在于，所述获取基于该G1、G2、P3和P4而得到的该IQ调制器中使用的本地振荡信号的I路分量和Q路分量之间的归一化幅度比，包括：7 . The method for setting image suppression parameters in IQ modulation according to claim 6 , wherein the acquisition is based on the G 1 , G 2 , P 3 and P 4 to obtain the local image used in the IQ modulator. 8 . The normalized amplitude ratio between the I and Q components of the oscillating signal, including: 获取基于公式：
Figure FDA0002931641700000031
而得到的该本地振荡信号的I路分量和Q路分量之间的归一化幅度比A。Get based on the formula:
Figure FDA0002931641700000031
The normalized amplitude ratio A between the I channel component and the Q channel component of the local oscillation signal is obtained. 8.根据权利要求6所述的IQ调制中镜像抑制参数的设置方法，其特征在于，所述获取基于该本地振荡信号的I路分量和Q路分量之间的归一化幅度比而得到的该第一幅度调整值，包括：8. The method for setting image suppression parameters in IQ modulation according to claim 6, wherein the acquisition is based on the normalized amplitude ratio between the I channel component and the Q channel component of the local oscillation signal and obtains The first amplitude adjustment value includes: 获取基于公式：qmc_gainA＝A·1024而得到的该第一幅度调整值qmc_gainA。The first amplitude adjustment value qmc_gainA obtained based on the formula: qmc_gainA=A·1024 is obtained. 9.根据权利要求6所述的IQ调制中镜像抑制参数的设置方法，其特征在于，该本地振荡信号的I路分量和Q路分量之间的归一化幅度比包括：第一归一化幅度比及第二归一化幅度比；9. The method for setting image suppression parameters in IQ modulation according to claim 6, wherein the normalized amplitude ratio between the I channel component and the Q channel component of the local oscillation signal comprises: a first normalization Amplitude ratio and second normalized amplitude ratio; 分别获取该第一归一化幅度比及该第二归一化幅度比对应的第三幅度调整值和第四幅度调整值；respectively acquiring a third amplitude adjustment value and a fourth amplitude adjustment value corresponding to the first normalized amplitude ratio and the second normalized amplitude ratio; 分别获取该第三幅度调整值和第四幅度调整值对应的该IQ调制器中镜像泄漏信号的第一泄漏功率值和第二泄漏功率值；respectively acquiring a first leakage power value and a second leakage power value of the image leakage signal in the IQ modulator corresponding to the third amplitude adjustment value and the fourth amplitude adjustment value; 获取该第一泄漏功率值和第二泄漏功率值中较小的一个对应的幅度调整值，并作为最终设置至该DAC的该第一幅度调整值。The amplitude adjustment value corresponding to the smaller one of the first leakage power value and the second leakage power value is acquired and used as the first amplitude adjustment value finally set to the DAC. 10.根据权利要求1所述的IQ调制中镜像抑制参数的设置方法，其特征在于，该预设值为1024。10 . The method for setting image suppression parameters in IQ modulation according to claim 1 , wherein the preset value is 1024. 11 . 11.一种设置装置，用于设置IQ调制中使用的镜像抑制参数，其特征在于，包含：11. A setting device for setting the image rejection parameter used in IQ modulation, characterized in that, comprising: 第一处理模块，用于预设IQ调制器的IQ信号的相位偏移
Figure FDA0002931641700000032
和
Figure FDA0002931641700000033
以及获取在该
Figure FDA0002931641700000034
和
Figure FDA0002931641700000035
下，该IQ调制器的镜像泄漏信号的功率P1和P2；The first processing module is used to preset the phase offset of the IQ signal of the IQ modulator
Figure FDA0002931641700000032
and
Figure FDA0002931641700000033
and get the
Figure FDA0002931641700000034
and
Figure FDA0002931641700000035
, the powers P 1 and P 2 of the image leakage signal of the IQ modulator; 第二处理模块，用于预设该IQ调制器的IQ信号中的I路分量和Q路分量之间的归一化幅度比G1和G2，以及获取在G1和G2下，该IQ调制器的镜像泄漏信号的功率P3和P4；以及The second processing module is configured to preset the normalized amplitude ratios G 1 and G 2 between the I-channel component and the Q-channel component in the IQ signal of the IQ modulator, and obtain, under G 1 and G 2 , the the powers P3 and P4 of the image leakage signal of the IQ modulator ; and 第三处理模块，用于获取基于该
Figure FDA0002931641700000042
P1和P2而得到该镜像抑制参数中的相位调整值；The third processing module is used to obtain the
Figure FDA0002931641700000042
P 1 and P 2 to obtain the phase adjustment value in the image rejection parameter; 第四处理模块，用于获取基于该G1、G2、P3和P4而得到该镜像抑制参数中的第一幅度调整值，并获取为预设值的该镜像抑制参数中的第二幅度调整值；以及a fourth processing module, configured to obtain a first amplitude adjustment value in the image suppression parameter obtained based on the G 1 , G 2 , P 3 and P 4 , and obtain the second amplitude adjustment value of the image suppression parameter as a preset value Amplitude adjustment value; and 设置模块，用于将该相位调整值、该第一幅度调整值以及该第二幅度调整值设置至模数转换器DAC中，其中该DAC为该IQ调制器的前端电路。A setting module is used for setting the phase adjustment value, the first amplitude adjustment value and the second amplitude adjustment value into an analog-to-digital converter DAC, wherein the DAC is a front-end circuit of the IQ modulator. 12.根据权利要求11所述的设置装置，其特征在于，所述第三处理模块，具体用于：12. The setting device according to claim 11, wherein the third processing module is specifically used for: 第一获取单元，用于获取基于该
Figure FDA0002931641700000043
P1和P2而得到的同相正交IQ调制器中使用的本地振荡信号的I路分量和Q路分量之间的正交相位误差；以及The first acquisition unit is used to acquire based on the
Figure FDA0002931641700000043
The quadrature phase error between the I component and the Q component of the local oscillator signal used in the in-phase quadrature IQ modulator resulting from P 1 and P 2 ; and 第二获取单元，用于获取基于该本地振荡信号的I路分量和Q路分量之间的正交相位误差而得到的该相位调整值。The second acquiring unit is configured to acquire the phase adjustment value obtained based on the quadrature phase error between the I channel component and the Q channel component of the local oscillation signal. 13.根据权利要求12所述的设置装置，其特征在于，13. The setting device of claim 12, wherein 所述第一获取单元，具体用于获取根据公式：
Figure FDA0002931641700000041
而得到的该本地振荡信号的I路分量和Q路分量之间的正交相位误差θ。The first obtaining unit is specifically used for obtaining according to the formula:
Figure FDA0002931641700000041
The obtained quadrature phase error θ between the I channel component and the Q channel component of the local oscillation signal. 14.根据权利要求12所述的设置装置，其特征在于，该第二获取单元，具体用于获取根据公式：
Figure FDA0002931641700000044
而得到的该相位调整值qmc_phaseAB，其中，
Figure FDA0002931641700000045
为输至该IQ调制器的IQ信号的I路分量和Q路分量之间的正交相位误差，且
Figure FDA0002931641700000046
等于该I路分量和Q路分量之间的正交相位误差。14. The setting device according to claim 12, wherein the second obtaining unit is specifically configured to obtain according to the formula:
Figure FDA0002931641700000044
And the obtained phase adjustment value qmc_phaseAB, where,
Figure FDA0002931641700000045
is the quadrature phase error between the I component and the Q component of the IQ signal input to the IQ modulator, and
Figure FDA0002931641700000046
is equal to the quadrature phase error between the I component and the Q component. 15.根据权利要求12所述的设置装置，其特征在于，该正交相位误差包括：第一正交相位误差及第二正交相位误差；15. The setting device of claim 12, wherein the quadrature phase error comprises: a first quadrature phase error and a second quadrature phase error; 所述第二获取单元，具体用于：The second obtaining unit is specifically used for: 获取分别基于该第一正交相位误差及第二正交相位误差而得到的第一相位调整值和第二相位调整值；acquiring a first phase adjustment value and a second phase adjustment value obtained based on the first quadrature phase error and the second quadrature phase error, respectively; 获取该第一相位调整值和该第二相位调整值对应的该IQ调制器的镜像泄漏信号的第一泄漏功率值和第二泄漏功率值；acquiring a first leakage power value and a second leakage power value of the image leakage signal of the IQ modulator corresponding to the first phase adjustment value and the second phase adjustment value; 获取该第一泄漏功率值和第二泄漏功率值中较小一个对应的相位调整值，并作为最终设置至该DAC的相位调整值。The phase adjustment value corresponding to the smaller one of the first leakage power value and the second leakage power value is acquired, and used as the phase adjustment value finally set to the DAC. 16.根据权利要求11所述的设置装置，其特征在于，所述第四处理模块，包括：16. The setting device according to claim 11, wherein the fourth processing module comprises: 第三获取单元，用于获取基于该G1、G2、P3和P4而得到的该IQ调制器中使用的本地振荡信号的I路分量和Q路分量之间的归一化幅度比；以及A third acquiring unit, configured to acquire the normalized amplitude ratio between the I channel component and the Q channel component of the local oscillation signal used in the IQ modulator obtained based on the G 1 , G 2 , P 3 and P 4 ;as well as 第四获取单元，用于获取基于该本地振荡信号的I路分量和Q路分量之间的归一化幅度比而得到的该第一幅度调整值。The fourth obtaining unit is configured to obtain the first amplitude adjustment value obtained based on the normalized amplitude ratio between the I channel component and the Q channel component of the local oscillation signal. 17.根据权利要求16所述的设置装置，其特征在于，所述第三获取单元，具体用于获取基于公式：
Figure FDA0002931641700000051
而得到的该本地振荡信号的I路分量和Q路分量之间的归一化幅度比A。17. The setting device according to claim 16, wherein the third obtaining unit is specifically configured to obtain a formula based on:
Figure FDA0002931641700000051
The normalized amplitude ratio A between the I channel component and the Q channel component of the local oscillation signal is obtained. 18.根据权利要求16所述的设置装置，其特征在于，所述第四获取单元，具体用于获取基于公式：qmc_gainA＝A·1024而得到的该第一幅度调整值qmc_gainA。18 . The setting device according to claim 16 , wherein the fourth obtaining unit is specifically configured to obtain the first amplitude adjustment value qmc_gainA obtained based on a formula: qmc_gainA=A·1024. 19 . 19.根据权利要求16所述的设置装置，其特征在于，该本地振荡信号的I路分量和Q路分量之间的归一化幅度比包括：第一归一化幅度比及第二归一化幅度比；19. The setting device according to claim 16, wherein the normalized amplitude ratio between the I channel component and the Q channel component of the local oscillation signal comprises: a first normalized amplitude ratio and a second normalized amplitude ratio Amplification ratio; 所述第四获取单元，具体用于：The fourth obtaining unit is specifically used for: 分别获取该第一归一化幅度比及该第二归一化幅度比对应的第三幅度调整值和第四幅度调整值；respectively acquiring the third amplitude adjustment value and the fourth amplitude adjustment value corresponding to the first normalized amplitude ratio and the second normalized amplitude ratio; 分别获取该第三幅度调整值和第四幅度调整值对应的该IQ调制器中镜像泄漏信号的第一泄漏功率值和第二泄漏功率值；respectively acquiring a first leakage power value and a second leakage power value of the image leakage signal in the IQ modulator corresponding to the third amplitude adjustment value and the fourth amplitude adjustment value; 获取该第一泄漏功率值和第二泄漏功率值中较小的一个对应的幅度调整值，并作为最终设置至该DAC的该第一幅度调整值。The amplitude adjustment value corresponding to the smaller one of the first leakage power value and the second leakage power value is obtained and used as the first amplitude adjustment value finally set to the DAC. 20.根据权利要求11所述的设置装置，其特征在于，该预设值为1024。20 . The setting device of claim 11 , wherein the default value is 1024. 21 . 21.一种射频拉远单元，其特征在于，包括：IQ调制器、模数转换器DAC和如权利要求11～20中任一项所述的设置装置，其中该DAC与该IQ调制器连接，用于将基带信号进行处理之后，传送至所述IQ调制器进行IQ调制；其中，该DAC包括：相位调节寄存器、第一增益调节寄存器和第二增益调节寄存器；且该设置装置用于设置该相位调节寄存器的相位调整值，该第一增益调节寄存器的第一幅度调整值及该第二增益调节寄存器的第二幅度调整值。21. A remote radio unit, comprising: an IQ modulator, an analog-to-digital converter DAC, and the setting device according to any one of claims 11 to 20, wherein the DAC is connected to the IQ modulator , which is used to process the baseband signal and transmit it to the IQ modulator for IQ modulation; wherein, the DAC includes: a phase adjustment register, a first gain adjustment register and a second gain adjustment register; and the setting device is used to set The phase adjustment value of the phase adjustment register, the first amplitude adjustment value of the first gain adjustment register, and the second amplitude adjustment value of the second gain adjustment register.
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