CN113162704A - Signal calibration method, device and system based on image rejection and electronic equipment - Google Patents
Signal calibration method, device and system based on image rejection and electronic equipment Download PDFInfo
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0082—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band
- H04B1/0085—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band where one band is the image frequency band of the other and the band selection is done by image rejection
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Abstract
The embodiment of the invention provides a signal calibration method, a device, a system and electronic equipment based on image rejection. By suppressing the amplitude of the mirror image signal, amplitude calibration and phase calibration of each path of effective signal component in the output signal generated by the signal generation circuit are realized. The process of adjusting the configuration parameters of the signal generating circuit does not need other instruments, so that the calibration cost is saved, the processes of amplitude calibration and phase calibration do not need human participation, and the calibration accuracy and the calibration efficiency are improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a system, and an electronic device for calibrating a signal based on image rejection.
Background
Signal calibration refers to reducing amplitude and phase differences between signal components in a signal by adjusting parameters in the signal system. In many cases, signal calibration is often required to improve the quality of signal transmission. For example, in a wireless communication base station structure, a direct conversion scheme using an IQ (in-phase component) Quadrature modulator as a core device is often adopted for a transmission link, and therefore the orthogonality of an IQ signal has a large influence on the quality of an rf signal. However, in practical use, the I-path and Q-path signals of the transmission channel have certain phenomena of amplitude imbalance and phase imbalance. This amplitude imbalance and phase imbalance is mainly introduced by the Analog path between the DAC (Digital-to-Analog Converter) output interface to the quadrature modulator input interface.
However, the existing calibration scheme for IQ signals requires a radio frequency spectrometer, a Personal Computer (PC), and automatic calibration software to implement the calibration scheme, which has high hardware cost and labor cost. Especially for broadband systems, the calibration time is also longer. In addition, the traditional DAC calibration method has complex algorithm and larger storage resource occupied by the algorithm, and the problem is more prominent particularly for a broadband base station system.
It can be seen that the method of calibrating the signal usually requires the help of other instruments and human intervention, and the calibration cost is high and the efficiency is low.
Disclosure of Invention
The embodiment of the invention provides a signal calibration method, a signal calibration device, a signal calibration system and electronic equipment based on image rejection, and aims to solve the problems that in the prior art, other instruments are needed for calibrating a signal, human participation is needed, the calibration cost is high, and the efficiency is low.
In view of the above technical problems, in a first aspect, an embodiment of the present invention provides a signal calibration method based on image rejection, including:
generating an initial signal component based on any central frequency point to be calibrated;
adjusting configuration parameters of a signal generation circuit according to a mirror image signal in a feedback signal and a preset adjustment condition so as to reduce the amplitude of the mirror image signal in an output signal of the signal generation circuit;
wherein the feedback signal is generated by a signal feedback circuit from a coupling signal; the coupling signal is obtained by coupling the output signal of the signal generating circuit by the signal feedback circuit after each initial signal component is input into the signal generating circuit.
In a second aspect, an embodiment of the present invention provides a signal calibration system based on image rejection, including a signal generation circuit, a signal feedback circuit, and an adjustment module;
the signal generating circuit is used for generating an output signal according to the received initial signal component;
the signal feedback circuit is used for coupling the output signal of the signal generating circuit to obtain a coupling signal and generating a feedback signal according to the coupling signal;
the adjusting module is used for executing the signal calibration method based on image rejection to reduce the amplitude of the image signal in the output signal of the signal generating circuit.
In a third aspect, an embodiment of the present invention provides an image rejection-based signal calibration apparatus, including:
the generating module is used for generating an initial signal component based on any central frequency point to be calibrated;
the parameter adjusting module is used for adjusting configuration parameters of the signal generating circuit according to the mirror image signal in the feedback signal and a preset adjusting condition so as to reduce the amplitude of the mirror image signal in the output signal of the signal generating circuit;
wherein the feedback signal is generated by a signal feedback circuit from a coupling signal; the coupling signal is obtained by coupling the output signal of the signal generating circuit by the signal feedback circuit after each initial signal component is input into the signal generating circuit.
In a fourth aspect, an embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the signal calibration method based on image rejection when executing the program.
In a fifth aspect, an embodiment of the present invention provides a non-transitory readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the image rejection-based signal calibration method.
According to the signal calibration method, the signal calibration device, the signal calibration system and the electronic equipment based on image rejection, an initial signal component is generated based on any central frequency point to be calibrated, and configuration parameters of a signal generation circuit are adjusted according to an image signal in a feedback signal and a preset adjustment condition so as to reduce the amplitude of the image signal in an output signal of the signal generation circuit. By suppressing the amplitude of the mirror image signal, amplitude calibration and phase calibration of each path of effective signal component in the output signal generated by the signal generation circuit are realized. The process of adjusting the configuration parameters of the signal generating circuit does not need other instruments, so that the calibration cost is saved, the processes of amplitude calibration and phase calibration do not need human participation, and the calibration accuracy and the calibration efficiency are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional calibration system for calibrating IQ signals of a base station;
fig. 2 is a schematic flowchart of a signal calibration method based on image rejection according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for implementing image rejection-based signal calibration by using configuration words in a DAC as configuration parameters according to an embodiment of the present invention;
fig. 4 is a schematic partial structure diagram of a base station performing signal calibration according to the signal calibration method based on image rejection according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a signal calibration system based on image rejection according to an embodiment of the present invention;
fig. 6 is a block diagram of a signal calibration apparatus based on image rejection according to an embodiment of the present invention;
fig. 7 is a schematic physical structure diagram of an electronic device according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a communication system, when an amplitude imbalance between an I-path signal and a Q-path signal and a phase imbalance between the I-path signal and the Q-path signal exist in an IQ signal, an EVM (vector error) index of a transmitter is deteriorated, and communication quality between a base station and a terminal is affected. In general, in practical use, a base station needs to perform amplitude calibration and phase calibration on an I-path signal and a Q-path signal in IQ signals output by a DAC, so that the I-path signal and the Q-path signal approach to ideal quadrature characteristics, and this method is called DAC calibration.
Generally, in DAC calibration, a DAC calibration configuration word corresponding to a certain frequency point of a transmission link is adjusted by observing the amplitude of an image at the frequency point, and after finding an optimal configuration word, the configuration word is written into a memory. However, the DAC calibration process needs a spectrum analyzer, and the calibration algorithm is complex, and requires large FPGA (Field Programmable Gate Array) resources and memory resources.
Specifically, fig. 1 shows a conventional calibration system for calibrating IQ signals of a base station, which employs a DAC calibration method. During the calibration process, the image signal needs to be subjected to amplitude test by the aid of a spectrum analyzer, and the measured amplitude is read by a test PC. In addition, calibration software with complex algorithm is needed to adjust the mirror image signal, so as to realize amplitude calibration and phase calibration of the IQ signal, and eliminate the phenomena of amplitude imbalance and phase imbalance of the I-path signal and the Q-path signal of the IQ signal. As shown in fig. 1, in the process of performing amplitude calibration and phase calibration on IQ signals, external equipment is required, human involvement is required, and the calibration process is complicated and inefficient.
To solve this technical problem, fig. 2 is a schematic flow chart of a signal calibration method based on image rejection according to this embodiment. The method is performed by any device or means capable of inputting an initial signal component to a signal generating circuit and receiving a feedback signal generated by a signal feedback circuit. Specifically, when the method is used to implement signal calibration on a signal (i.e., an output signal of a signal generation circuit) transmitted by a base station, the device may be an RRU in the base station, or the device may be an FPGA in the RRU, which is connected to the signal generation circuit and the signal feedback circuit.
Referring to fig. 2, the method comprises the steps of:
step 201: generating an initial signal component based on any central frequency point to be calibrated;
step 202: adjusting configuration parameters of a signal generation circuit according to a mirror image signal in a feedback signal and a preset adjustment condition so as to reduce the amplitude of the mirror image signal in an output signal of the signal generation circuit; wherein the feedback signal is generated by a signal feedback circuit from a coupling signal; the coupling signal is obtained by coupling the output signal of the signal generating circuit by the signal feedback circuit after each initial signal component is input into the signal generating circuit.
It should be noted that, the lower the amplitude of the image signal in the output signal of the signal generation circuit, the more beneficial to eliminate the amplitude imbalance of each effective signal component in the output signal (i.e., the more beneficial to implement the amplitude calibration of each effective signal component), and the more beneficial to eliminate the phase imbalance of each effective signal component in the output signal (i.e., the more beneficial to implement the phase calibration of each effective signal component). Therefore, if signal calibration (including amplitude calibration and phase calibration for each effective signal component) needs to be performed on the output signal of the signal generation circuit, the amplitude of the mirror signal in the output signal of the signal generation circuit needs to be reduced as much as possible. In the embodiment, the amplitude of the image signal in the output signal of the signal generation circuit is reduced by adjusting the configuration parameters of the signal generation circuit, so that the signal calibration of the output signal is realized.
In this embodiment, there are usually a plurality of center frequency points to be calibrated, and step 201 and step 202 need to be executed for each center frequency point, so that the signal generation circuit can output an output signal realizing signal calibration based on each center frequency point. For example, if there are N central frequency points, the above step 201 and 202 are executed from the first central frequency point until the N central frequency points are traversed, and the calibration process is completed.
The signal generating circuit is a circuit that generates an output signal based on each initial signal component of a certain center frequency point, and the output signal is composed of an effective signal and a mirror signal. The signal feedback circuit is a circuit that couples output signals of the signal generation circuit and processes the coupled signals obtained by the coupling to generate feedback signals. The configuration parameters include parameters in the signal generation circuit that can affect the amplitude of the image signal in the output signal. Specifically, the configuration parameter includes a parameter in a certain device in the signal generation circuit. For example, the configuration parameters include two configuration words in the DAC of the signal generation circuit, which are < DIGITAL GAIN > and < PHASE OFFSET >, respectively.
In the signal calibration method based on image rejection provided in this embodiment, an initial signal component is generated based on any center frequency point to be calibrated, and configuration parameters of a signal generation circuit are adjusted according to an image signal in a feedback signal and a preset adjustment condition, so as to reduce the amplitude of the image signal in an output signal of the signal generation circuit. By suppressing the amplitude of the mirror image signal, amplitude calibration and phase calibration of each path of effective signal component in the output signal generated by the signal generation circuit are realized. The process of adjusting the configuration parameters of the signal generating circuit does not need other instruments, so that the calibration cost is saved, the processes of amplitude calibration and phase calibration do not need human participation, and the calibration accuracy and the calibration efficiency are improved.
Further, on the basis of the foregoing embodiment, the adjusting the configuration parameters of the signal generating circuit according to the mirror signal in the feedback signal and the preset adjusting condition in step 202 includes:
circularly executing parameter adjustment operation on the configuration parameters corresponding to each path of effective signal component in the signal generation circuit until the adjustment is finished, and storing the adjusted configuration parameters; the effective signal component is a component of an effective signal except an image signal in an output signal of the signal generating circuit;
the parameter adjustment operation comprises: inputting an initial signal component into the signal generating circuit, acquiring a feedback signal output by the signal feedback circuit, judging whether a mirror image signal in the feedback signal meets the preset adjusting condition, if so, finishing the adjustment, otherwise, adjusting the configuration parameter corresponding to the effective signal component in the signal generating circuit;
wherein the preset adjusting condition comprises at least one of the following conditions: when the parameter adjustment operation is executed at this time, the amplitude of the mirror image signal in the feedback signal is smaller than or equal to a preset amplitude; when the parameter adjustment operation is executed this time, the amplitude of the mirror image signal in the feedback signal is larger than the amplitude of the mirror image signal in the feedback signal when the parameter adjustment operation is executed last time; the number of times of performing the parameter adjustment operation is greater than or equal to a preset number of times.
Further, before performing the parameter adjustment operation, the method further includes: setting initial values for configuration parameters of the signal generation circuit.
When the configuration parameters need to be adjusted according to a plurality of preset adjustment conditions, specific determination logics of the plurality of preset adjustment conditions may be set according to the needs, which is not specifically limited in this embodiment.
In this embodiment, the configuration parameters corresponding to each effective signal component are adjusted cyclically to realize automatic adjustment of the configuration parameters corresponding to the effective signal component. Meanwhile, the configuration parameters corresponding to each path of effective signal component are adjusted, and the configuration parameters are comprehensively adjusted.
Further, on the basis of the foregoing embodiments, the determining whether the mirror signal in the feedback signal satisfies the preset adjustment condition, if so, the adjusting is finished, otherwise, the adjusting the configuration parameter corresponding to the effective signal component in the signal generating circuit includes:
judging whether the amplitude of the mirror image signal in the feedback signal is smaller than or equal to the preset amplitude, if so, finishing the adjustment, otherwise, judging whether the parameter adjustment operation executed this time is the parameter adjustment operation executed for the first time, and if so, adjusting the configuration parameters corresponding to the effective signal components in the signal generation circuit;
if the parameter adjusting operation is not executed for the first time, judging whether the amplitude of the mirror image signal in the feedback signal is larger than the amplitude of the mirror image signal in the feedback signal when the parameter adjusting operation is executed for the current time, if so, finishing the adjustment, otherwise, judging whether the number of times of executing the parameter adjusting operation is larger than or equal to the preset number;
if the number of times of executing parameter adjustment operation is larger than or equal to the preset number of times, the adjustment is finished, otherwise, the configuration parameters corresponding to the effective signal components in the signal generation circuit are adjusted.
When configuration parameters corresponding to different effective signal components are adjusted, the preset amplitudes in the preset adjustment conditions may be the same or different, and the preset times may be the same or different, which is not specifically limited by this embodiment. For example, when the configuration parameters corresponding to different effective signal components are adjusted, the preset times may be set to 5 times.
In this embodiment, a plurality of preset adjustment conditions are combined, and when a condition defined by a preset amplitude value is satisfied, it indicates that the image signal in the output signal can be better suppressed by the current configuration parameter. However, in order to avoid that the amplitude of the mirror image signal in the feedback signal is difficult to converge to be small or the convergence speed is slow, the present embodiment further compares the amplitudes of the mirror image signal in the feedback signal when the parameter adjustment operation is performed two times adjacently. Furthermore, the number of times of executing the parameter adjustment operation is limited, so that the problem that the parameter adjustment operation is executed circularly all the time when other kinds of preset adjustment conditions cannot be met is avoided, and resource waste is caused.
According to the method and the device, the process of adjusting the configuration parameters corresponding to each effective signal component is more reasonable through the combination of multiple preset adjusting conditions, and the adjusting efficiency is improved.
Further, on the basis of the foregoing embodiments, the configuration parameter includes a configuration word corresponding to each effective signal component in an output signal of the signal generation circuit in a digital-to-analog converter DAC of the signal generation circuit.
Adjusting only configuration words in the DAC
Configuration parameters are limited in a certain device by combining the device characteristics and the structural characteristics of the signal generating circuit, and only configuration words in the DAC are adjusted, so that the process of adjusting the configuration parameters and the complexity of adjusting are simplified, and the calibration efficiency is improved.
Further, still include:
if a signal of a certain target central frequency point needs to be transmitted, acquiring a configuration parameter determined by any signal calibration method based on image rejection based on the central frequency point as a target configuration parameter;
and configuring the signal generation circuit as the target configuration parameters, inputting each initial signal component generated based on the target central frequency point into the signal generation circuit to obtain an output signal generated by the signal generation circuit, and transmitting the output signal.
To specifically explain the signal calibration method based on image rejection, fig. 3 is a schematic flow chart of the signal calibration method based on image rejection, which is implemented by the present implementation, with configuration words in the DAC as configuration parameters. Assuming that the "image rejection based signal calibration method" is executed by a certain functional module in the FPGA, as shown in fig. 3, the process needs to adjust the configuration word < DIGITAL GAIN > (i.e., the configuration parameter corresponding to the I-path signal) in the DAC, and then adjust the configuration word < PHASE OFFSET > (i.e., the configuration parameter corresponding to the Q-path signal) in the DAC.
The process compares the instant amplitude value of the image signal with the amplitude limiting value, further adjusts the amplitude and phase value of the I path signal and the Q path signal according to the comparison result, acquires the instant amplitude value of the image signal again after the adjustment is finished, compares the instant value with the threshold value, and finally finishes the determination of the register value related to the amplitude and the phase of the IQ signal through repeated adjustment and comparison. The process comprises the following steps:
step 1: the FPGA first sets initial values for registers < DIGITAL GAIN > and < PHASE OFFSET > inside the DAC.
Step 2: corresponding to the I-path signal<DIGITAL GAIN>And (3) adjusting the configuration word: the FPGA circuit controls the DAC to transmit IQ signals which are respectively expressed as fIAnd fQ。fIAnd fQAfter modulation, frequency mixing and amplification, a main signal fc and a corresponding image signal f are generatedimageThe mirror image signal fimageAfter being obtained by a feedback link (namely a signal feedback circuit), the signal is processed with a threshold f in the FPGAimage，T(preset amplitude) are compared. Will be paired with<DIGITAL GAIN>After the nth adjustment, the signal output by the feedback link is denoted as fimage，n。
When f isimage，nAmplitude is less than or equal to fimage，TAt amplitude, DAC calibration ends (i.e., adjustment ends), when fimage，nAmplitude > fimage，TWhen the amplitude is larger, the register is continuously adjusted by taking 0xX as the step<DIGITAL GAIN>The configuration word of (2).
In the process of adjusting the configuration word of < DIGITAL GAIN >, the configuration word of register < DIGITAL GAIN > is adjusted in steps of 0xX (X represents any value among 1, 2, …, and E, F, and "0X" represents hexadecimal depending on the actual debug).
And step 3: adjusting DAC registers<DIGITAL GAIN>The feedback link then obtains the image signal fimage，n+1。
When f isimage，n+1Amplitude is less than or equal to fimage，TAmplitude, the DAC calibration ends. When f isimage，n+1Amplitude > fimage，TAmplitude, whether f is judgedimage，n+1Amplitude > fimage，nIf the amplitude is not true, continuously using 0xX as step to adjust register<DIGITAL GAIN>Until the value of n is accumulated to 5, the configuration word of (1) is completed<DIGITAL GAIN>Modifying the configuration word, ready to be developed<PHASE OFFSET>Modification of the configuration word.
If fimage，n+1Amplitude > fimage，nIf the amplitude is established, it is immediately completed<DIGITAL GAIN>Modifying the configuration word, ready to be developed<PHASE OFFSET>Modification of the configuration word.
And 4, step 4: continuing to correspond to Q-path signals<PHASE OFFSET>The configuration word is adjusted to<PHASE OFFSET>After the mth adjustment, the signal output by the feedback link is recorded as fimage，m: using 0xX as step adjusting register<PHASE OFFSET>The feedback link obtains the image signal fimage，mWhen f isimage，mAmplitude is less than or equal to fimage，TAt amplitude, the DAC calibration ends. When f isimage，mAmplitude > fimage，TThe amplitude value is continuously adjusted by taking 0xX as a stepping register<PHASE OFFSET>The configuration word of (2).
And 5: adjusting register<PHASE OFFSET>The feedback link then obtains the image signal fimage，m+1When f isimage，m+1Amplitude is less than or equal to fimage，TAnd when the amplitude is large, the DAC adjustment is finished. When f isimage，m+1Amplitude > fimage，TAmplitude, whether f is judgedimage，m+1Amplitude > fimage，mIf the amplitude is not true, continuously using 0xX as step to adjust register<PHASE OFFSET>Until the m value is accumulated to 5, the configuration word of (1) is completed<PHASE OFFSET>Modifying the configuration word, and finishing DAC calibration; if fimage，m+1Amplitude > fimage，mIf the amplitude is established, it is immediately completed<PHASE OFFSET>And modifying the configuration word and finishing DAC calibration.
When the method provided in this embodiment is applied to signal calibration of a signal transmitted by a base station, the above procedure may be performed by an FPGA in the base station, where the FPGA is in an RRU (Remote Radio Unit) of the base station. Therefore, when the FPGA is used to execute the signal calibration method based on image rejection, fig. 4 shows a schematic diagram of a local structure of the base station for performing signal calibration according to the signal calibration method based on image rejection provided in this embodiment. In the process of transmitting a signal by a base station, the BBU in fig. 4 provides a baseband signal to the RRU, and the RRU sets the configuration parameter of the signal generation circuit to the configuration parameter adjusted by the "signal calibration method based on image rejection" provided in this embodiment, so that the amplitude of the image signal in the signal transmitted by the RRU is as small as possible, the amplitudes between effective signal components (I and Q signals) in the effective signal tend to be balanced, and the phases between the effective signal components also tend to be balanced, which is beneficial to improving communication quality. The signal calibration is carried out by the signal calibration method based on image rejection provided by the embodiment, the base station does not need to be connected with external equipment or an instrument, the connection operation of the external equipment or the instrument is not needed in the calibration process, the external equipment or the instrument is not needed to be adjusted, the operation in the calibration process is simplified, and the calibration efficiency is improved.
In addition, fig. 5 is a schematic structural diagram of a signal calibration system based on image rejection provided in this embodiment, referring to fig. 5, the signal calibration system based on image rejection includes a signal generation circuit 501, a signal feedback circuit 502, and an adjustment module 503;
the signal generating circuit 501 is configured to generate an output signal according to the received initial signal component;
the signal feedback circuit 502 is configured to couple an output signal of the signal generating circuit to obtain a coupling signal, and generate a feedback signal according to the coupling signal;
the adjusting module 503 is configured to perform any one of the above image rejection-based signal calibration methods to reduce the amplitude of the image signal in the output signal of the signal generating circuit.
It should be noted that the signal generation circuit 501 is not limited to the structure shown in fig. 5, as long as an output signal can be generated according to each initial signal component input by the adjustment module 503, and the signal generation circuit 501 has a parameter capable of influencing the amplitude of the mirror image signal in the output signal. The signal feedback circuit 502 is not limited to the structure shown in fig. 5, as long as it can couple the output signal of the signal generation circuit 501 to obtain a coupled signal and process the coupled signal to obtain a feedback signal. The adjusting module 503 is not limited to the structure shown in fig. 5, as long as it can input an initial signal component to the signal generating circuit 501, receive a feedback signal output from the signal feedback circuit 502, and implement signal calibration according to the feedback signal. For example, the adjusting module 503 may include an FPGA and a memory as shown in fig. 5, or may be other functional modules or devices capable of performing the steps 201 and 202.
In the signal calibration system based on image rejection provided in this embodiment, an initial signal component is generated based on any center frequency point to be calibrated, and configuration parameters of a signal generation circuit are adjusted according to an image signal in a feedback signal and a preset adjustment condition, so as to reduce the amplitude of the image signal in an output signal of the signal generation circuit. By suppressing the amplitude of the mirror image signal, amplitude calibration and phase calibration of each path of effective signal component in the output signal generated by the signal generation circuit are realized. The process of adjusting the configuration parameters of the signal generating circuit does not need other instruments, so that the calibration cost is saved, the processes of amplitude calibration and phase calibration do not need human participation, and the calibration accuracy and the calibration efficiency are improved.
Further, on the basis of the above embodiment, the signal feedback circuit 502 includes a coupler and a signal processing unit;
the coupler is used for coupling an output signal of the signal generating circuit to obtain a coupling signal, and inputting the coupling signal into the signal processing unit;
the signal processing unit is used for converting the coupling signal into a digital signal and taking the converted digital signal as the feedback signal.
When the adjusting module 503 implements the image rejection based signal calibration method through the FPGA as shown in fig. 5, a signal processing unit may be disposed behind the coupler to generate a digital signal supported by the FPGA.
Wherein the signal processing unit comprises a high frequency ADC (Analog-to-Digital Converter). A high-frequency ADC is a device capable of converting an analog signal of a high frequency into a digital signal. Alternatively, the signal processing unit includes a mixer and an analog-to-digital converter ADC.
In this embodiment, the coupler and the signal processing unit are used to implement a process of generating a feedback signal according to the output signal, and provide a signal for adjusting the configuration parameter for the adjustment module.
Further, on the basis of the above embodiments, as shown in fig. 5, the signal processing unit includes a mixer and an analog-to-digital converter ADC;
the frequency mixer is used for reducing the frequency of the coupling signal according to the local oscillation signal output by the local oscillation circuit to obtain a low-frequency signal, and inputting the low-frequency signal into the ADC;
the ADC is used for converting the low-frequency signal into a digital signal, and the converted digital signal is used as the feedback signal.
In fig. 5, the load resistor connected to the coupler is a resistor for adjusting a coupling parameter of the coupler.
In this embodiment, the frequency of the coupling signal is reduced by the mixer to obtain a low-frequency signal, and then analog-to-digital conversion is performed by the ADC, so that a process of generating a feedback signal according to the output signal is realized, and a signal for adjusting the configuration parameter is provided to the adjustment module.
Further, on the basis of the foregoing embodiments, as shown in fig. 5, the signal generating circuit includes a DAC, a filtering unit, a quadrature modulator, a signal amplifying unit, and a local oscillation circuit;
the DAC is used for converting the received initial signal components into analog signals to obtain analog signals corresponding to the initial signal components, and the analog signals corresponding to the initial signal components are input into the filtering unit;
the filtering unit is used for filtering the analog signals corresponding to the initial signal components and inputting the filtered analog signals into the quadrature modulator;
the quadrature modulator is used for generating a transmitting signal according to the analog signal corresponding to each filtered initial signal component and the local oscillator signal output by the local oscillator circuit, and inputting the transmitting signal into the signal amplifying unit;
the signal amplification unit is used for amplifying the transmitting signal and taking the amplified transmitting signal as an output signal of the signal generation circuit.
The filtering unit comprises a plurality of reconstruction filters, and each reconstruction filter is used for filtering the digital signal of one path of initial signal component output by the DAC.
Wherein the signal amplification unit comprises a driving amplifier and a power amplifier; the driving amplifier is used for amplifying the transmitting signal and inputting the amplified transmitting signal into the power amplifier, and the power amplifier is used for amplifying the transmitting signal input by the driving amplifier to obtain the output signal.
The local oscillation signal input to the quadrature modulator by the local oscillation circuit is the same as the local oscillation signal input to the frequency mixer by the local oscillation circuit.
The present embodiment realizes the generation of the output signal according to each initial signal component through the signal generating circuit, and provides a signal source for the signal feedback circuit.
When the method provided in this embodiment is applied to signal calibration of a signal transmitted by a Base station, as an example, if IQ is calibrated, the calibration process may be implemented in an RRU inside the Base station, regardless of a Base Band Unit (BBU). Specifically, as shown in fig. 5, the IQ calibration circuit is composed of a signal generation circuit, a signal feedback circuit, and an amplitude/phase adjustment circuit, wherein the signal generation circuit is composed of a DAC, a quadrature modulator, a local oscillator circuit, a driver amplifier, and a power amplifier; the feedback circuit consists of a directional coupler, a frequency mixer, a local oscillator circuit and an ADC; the amplitude/phase adjusting circuit is composed of an FPGA circuit.
The working principle of the signal generating circuit is as follows:
in the first step, the DAC sends I path cosine signals and Q path sine signals.
And secondly, the signals of the paths I and Q are respectively sent to reconstruction filters of the paths I and Q to complete filtering of the output signals of the DAC.
And thirdly, filtering the I and Q signals, then entering a quadrature modulator, completing the modulation and frequency conversion functions of the IQ signal by the quadrature modulator, and outputting a single-ended radio frequency signal. In the modulation and frequency conversion processes, the local oscillation circuit provides the local oscillation signal required by the modulator.
And fourthly, the single-ended radio frequency signal output by the modulator is amplified by the driving amplifier and the power amplifier in two stages and then is sent to a filter or a duplexer.
The working principle of the signal feedback circuit is as follows:
in the first step, the coupler obtains the image signal generated by the signal generating circuit from the output end of the power amplifying circuit.
In the second step, the image signal is down-converted by a mixer.
And thirdly, sampling the image signal after frequency conversion by an ADC, converting the image signal into a digital intermediate frequency signal, and finally sending the digital intermediate frequency signal to an FPGA circuit.
The working principle of the amplitude/phase adjusting circuit is as follows:
the FPGA circuit controls the modification of DAC internal registers < DIGITAL GAIN > and < PHASE OFFSET > configuration words through SPI serial signals, where register < DIGITAL GAIN > is responsible for developing corrections for the amplitude imbalance of IQ signals and register < PHASE OFFSET > is responsible for developing corrections for the PHASE imbalance of IQ signals. Assuming that the number of the center frequency points of the base station is N, and the 1 st center frequency point is fc, then:
firstly, the FPGA circuit controls the signal generation circuit to generate a single-tone signal with the frequency point fc.
And secondly, controlling a signal feedback circuit to acquire a mirror image signal with a fimage frequency point by the FPGA circuit.
Third, the FPGA circuit develops calibration work according to a specific DAC calibration algorithm (as in example 2).
Fourthly, the FPGA circuit writes the obtained configuration word of the register < DIGITAL GAIN > and the obtained configuration word of the register < PHASE OFFSET > into the memory, and the calibration work of the 1 st central frequency point is finished.
And fifthly, continuously executing the calibration work of the remaining N-1 central frequency points, wherein the calibration step corresponding to each central frequency point is from the first step to the fourth step.
And sixthly, after the calibration work of the Nth central frequency point is finished, the completion of the whole IQ signal calibration process is indicated.
It should be noted that, it is assumed that the 1 st central frequency point is fc, and the local oscillation signal is fLOIf the high local oscillation scheme is adopted, the image signal frequency point fimage＝fc+(fLO-fc)；
If a low local oscillation scheme is adopted, the image signal frequency point fimage＝fc+(fc-fLO)。
The signal calibration method and system based on image rejection provided by the embodiment can realize calibration of the IQ signal of the base station by means of the existing signal feedback circuit of the base station or only slightly improving the circuit of the base station, thereby ensuring the orthogonality of the IQ signal. The calibration method provided by the embodiment can be realized by adjusting the DAC in the FPGA, has a simple algorithm, only involves two registers, occupies few FPGA resources and memory resources, and is very suitable for a broadband base station system. The following technical effects can be achieved: (1) the automatic calibration can be realized without a calibration instrument, a test PC and operators, the calibration cost is low, and the calibration efficiency is high; (2) for a base station with a feedback channel designed inside, for example, a current mainstream 4G or 5G base station, automatic calibration of an IQ signal can be realized only through software design without adding extra hardware cost; (3) the algorithm flow for realizing calibration by adjusting the DAC configuration parameters is simple, and few FPGA circuit resources and memory resources are occupied.
In addition, this embodiment provides an RRU including the signal calibration system based on image rejection described in any of the above embodiments.
In addition, this embodiment provides a base station, where the base station includes the RRU described above.
In addition, fig. 6 is a block diagram of a signal calibration apparatus based on image rejection according to the present embodiment, referring to fig. 6, the apparatus includes a generating module 601 and a parameter adjusting module 602, wherein,
a generating module 601, configured to generate an initial signal component based on any center frequency point to be calibrated;
a parameter adjusting module 602, configured to adjust configuration parameters of the signal generating circuit according to the mirror image signal in the feedback signal and a preset adjustment condition, so as to reduce an amplitude of the mirror image signal in an output signal of the signal generating circuit;
wherein the feedback signal is generated by a signal feedback circuit from a coupling signal; the coupling signal is obtained by coupling the output signal of the signal generating circuit by the signal feedback circuit after each initial signal component is input into the signal generating circuit.
The signal calibration apparatus based on image rejection provided in this embodiment is suitable for the signal calibration method based on image rejection provided in each of the above embodiments, and is not described herein again.
In the signal calibration device based on image rejection provided in this embodiment, an initial signal component is generated based on any center frequency point to be calibrated, and according to an image signal in a feedback signal and a preset adjustment condition, configuration parameters of a signal generation circuit are adjusted to reduce an amplitude of the image signal in an output signal of the signal generation circuit. By suppressing the amplitude of the mirror image signal, amplitude calibration and phase calibration of each path of effective signal component in the output signal generated by the signal generation circuit are realized. The process of adjusting the configuration parameters of the signal generating circuit does not need other instruments, so that the calibration cost is saved, the processes of amplitude calibration and phase calibration do not need human participation, and the calibration accuracy and the calibration efficiency are improved.
Further, on the basis of the foregoing embodiment, the adjusting the configuration parameters of the signal generating circuit according to the mirror signal in the feedback signal and a preset adjusting condition includes:
circularly executing parameter adjustment operation on the configuration parameters corresponding to each path of effective signal component in the signal generation circuit until the adjustment is finished, and storing the adjusted configuration parameters; the effective signal component is a component of an effective signal except an image signal in an output signal of the signal generating circuit;
the parameter adjustment operation comprises: inputting an initial signal component into the signal generating circuit, acquiring a feedback signal output by the signal feedback circuit, judging whether a mirror image signal in the feedback signal meets the preset adjusting condition, if so, finishing the adjustment, otherwise, adjusting the configuration parameter corresponding to the effective signal component in the signal generating circuit;
wherein the preset adjusting condition comprises at least one of the following conditions: when the parameter adjustment operation is executed at this time, the amplitude of the mirror image signal in the feedback signal is smaller than or equal to a preset amplitude; when the parameter adjustment operation is executed this time, the amplitude of the mirror image signal in the feedback signal is larger than the amplitude of the mirror image signal in the feedback signal when the parameter adjustment operation is executed last time; the number of times of performing the parameter adjustment operation is greater than or equal to a preset number of times.
Further, on the basis of the foregoing embodiments, the determining whether the mirror signal in the feedback signal satisfies the preset adjustment condition, if so, the adjusting is finished, otherwise, the adjusting the configuration parameter corresponding to the effective signal component in the signal generating circuit includes:
judging whether the amplitude of the mirror image signal in the feedback signal is smaller than or equal to the preset amplitude, if so, finishing the adjustment, otherwise, judging whether the parameter adjustment operation executed this time is the parameter adjustment operation executed for the first time, and if so, adjusting the configuration parameters corresponding to the effective signal components in the signal generation circuit;
if the parameter adjusting operation is not executed for the first time, judging whether the amplitude of the mirror image signal in the feedback signal is larger than the amplitude of the mirror image signal in the feedback signal when the parameter adjusting operation is executed for the current time, if so, finishing the adjustment, otherwise, judging whether the number of times of executing the parameter adjusting operation is larger than or equal to the preset number;
if the number of times of executing parameter adjustment operation is larger than or equal to the preset number of times, the adjustment is finished, otherwise, the configuration parameters corresponding to the effective signal components in the signal generation circuit are adjusted.
Further, on the basis of the foregoing embodiments, the configuration parameter includes a configuration word corresponding to each effective signal component in an output signal of the signal generation circuit in a digital-to-analog converter DAC of the signal generation circuit.
Further, fig. 7 is a schematic diagram showing an entity structure of the electronic device provided in the present embodiment.
Referring to fig. 7, the electronic device includes: a processor (processor)701, a communication Interface (Communications Interface)702, a memory (memory)703 and a communication bus 704, wherein the processor 701, the communication Interface 702 and the memory 703 complete communication with each other through the communication bus 704. The processor 701 may call logic instructions in the memory 703 to perform the following method: generating an initial signal component based on any central frequency point to be calibrated; adjusting configuration parameters of a signal generation circuit according to a mirror image signal in a feedback signal and a preset adjustment condition so as to reduce the amplitude of the mirror image signal in an output signal of the signal generation circuit; wherein the feedback signal is generated by a signal feedback circuit from a coupling signal; the coupling signal is obtained by coupling the output signal of the signal generating circuit by the signal feedback circuit after each initial signal component is input into the signal generating circuit.
In addition, the logic instructions in the memory 703 can be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The present embodiments disclose a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the methods provided by the above-described method embodiments, for example, comprising: generating an initial signal component based on any central frequency point to be calibrated; adjusting configuration parameters of a signal generation circuit according to a mirror image signal in a feedback signal and a preset adjustment condition so as to reduce the amplitude of the mirror image signal in an output signal of the signal generation circuit; wherein the feedback signal is generated by a signal feedback circuit from a coupling signal; the coupling signal is obtained by coupling the output signal of the signal generating circuit by the signal feedback circuit after each initial signal component is input into the signal generating circuit.
The present embodiments provide a non-transitory computer readable storage medium having stored thereon a computer program, the computer program being executable by a processor to perform the method of: generating an initial signal component based on any central frequency point to be calibrated; adjusting configuration parameters of a signal generation circuit according to a mirror image signal in a feedback signal and a preset adjustment condition so as to reduce the amplitude of the mirror image signal in an output signal of the signal generation circuit; wherein the feedback signal is generated by a signal feedback circuit from a coupling signal; the coupling signal is obtained by coupling the output signal of the signal generating circuit by the signal feedback circuit after each initial signal component is input into the signal generating circuit.
The above-described embodiments of the electronic device and the like are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may also be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (14)
1. A method for signal calibration based on image rejection, comprising:
generating an initial signal component based on any central frequency point to be calibrated;
adjusting configuration parameters of a signal generation circuit according to a mirror image signal in a feedback signal and a preset adjustment condition so as to reduce the amplitude of the mirror image signal in an output signal of the signal generation circuit;
wherein the feedback signal is generated by a signal feedback circuit from a coupling signal; the coupling signal is obtained by coupling the output signal of the signal generating circuit by the signal feedback circuit after each initial signal component is input into the signal generating circuit.
2. The method for calibrating signal based on image rejection according to claim 1, wherein said adjusting configuration parameters of the signal generating circuit according to the image signal in the feedback signal and a preset adjusting condition comprises:
circularly executing parameter adjustment operation on the configuration parameters corresponding to each path of effective signal component in the signal generation circuit until the adjustment is finished, and storing the adjusted configuration parameters; the effective signal component is a component of an effective signal except an image signal in an output signal of the signal generating circuit;
the parameter adjustment operation comprises: inputting an initial signal component into the signal generating circuit, acquiring a feedback signal output by the signal feedback circuit, judging whether a mirror image signal in the feedback signal meets the preset adjusting condition, if so, finishing the adjustment, otherwise, adjusting the configuration parameter corresponding to the effective signal component in the signal generating circuit;
wherein the preset adjusting condition comprises at least one of the following conditions: when the parameter adjustment operation is executed at this time, the amplitude of the mirror image signal in the feedback signal is smaller than or equal to a preset amplitude; when the parameter adjustment operation is executed this time, the amplitude of the mirror image signal in the feedback signal is larger than the amplitude of the mirror image signal in the feedback signal when the parameter adjustment operation is executed last time; the number of times of performing the parameter adjustment operation is greater than or equal to a preset number of times.
3. The method according to claim 2, wherein the determining whether the image signal in the feedback signal satisfies the preset adjustment condition, if so, the adjustment is completed, otherwise, the adjusting the configuration parameter corresponding to the effective signal component in the signal generating circuit includes:
judging whether the amplitude of the mirror image signal in the feedback signal is smaller than or equal to the preset amplitude, if so, finishing the adjustment, otherwise, judging whether the parameter adjustment operation executed this time is the parameter adjustment operation executed for the first time, and if so, adjusting the configuration parameters corresponding to the effective signal components in the signal generation circuit;
if the parameter adjusting operation is not executed for the first time, judging whether the amplitude of the mirror image signal in the feedback signal is larger than the amplitude of the mirror image signal in the feedback signal when the parameter adjusting operation is executed for the current time, if so, finishing the adjustment, otherwise, judging whether the number of times of executing the parameter adjusting operation is larger than or equal to the preset number;
if the number of times of executing parameter adjustment operation is larger than or equal to the preset number of times, the adjustment is finished, otherwise, the configuration parameters corresponding to the effective signal components in the signal generation circuit are adjusted.
4. The method according to claim 1, wherein the configuration parameter comprises a configuration word corresponding to each effective signal component in the output signal of the signal generation circuit in a digital-to-analog converter (DAC) of the signal generation circuit.
5. A signal calibration system based on image rejection is characterized by comprising a signal generation circuit, a signal feedback circuit and an adjustment module;
the signal generating circuit is used for generating an output signal according to the received initial signal component;
the signal feedback circuit is used for coupling the output signal of the signal generating circuit to obtain a coupling signal and generating a feedback signal according to the coupling signal;
the adjusting module is used for executing the image suppression-based signal calibration method of any one of claims 1 to 4 to reduce the amplitude of the image signal in the output signal of the signal generating circuit.
6. The image rejection based signal calibration system according to claim 5, wherein said signal feedback circuit comprises a coupler and a signal processing unit;
the coupler is used for coupling an output signal of the signal generating circuit to obtain a coupling signal, and inputting the coupling signal into the signal processing unit;
the signal processing unit is used for converting the coupling signal into a digital signal and taking the converted digital signal as the feedback signal.
7. The image rejection based signal calibration system according to claim 6, wherein said signal processing unit comprises a mixer and an analog-to-digital converter (ADC);
the frequency mixer is used for reducing the frequency of the coupling signal according to the local oscillation signal output by the local oscillation circuit to obtain a low-frequency signal, and inputting the low-frequency signal into the ADC;
the ADC is used for converting the low-frequency signal into a digital signal, and the converted digital signal is used as the feedback signal.
8. The image rejection based signal calibration system according to claim 5, wherein said signal generation circuit comprises a DAC, a filtering unit, a quadrature modulator, a signal amplification unit, and a local oscillation circuit;
the DAC is used for converting the received initial signal components into analog signals to obtain analog signals corresponding to the initial signal components, and the analog signals corresponding to the initial signal components are input into the filtering unit;
the filtering unit is used for filtering the analog signals corresponding to the initial signal components and inputting the filtered analog signals into the quadrature modulator;
the quadrature modulator is used for generating a transmitting signal according to the analog signal corresponding to each filtered initial signal component and the local oscillator signal output by the local oscillator circuit, and inputting the transmitting signal into the signal amplifying unit;
the signal amplification unit is used for amplifying the transmitting signal and taking the amplified transmitting signal as an output signal of the signal generation circuit.
9. An image rejection based signal calibration apparatus, comprising:
the generating module is used for generating an initial signal component based on any central frequency point to be calibrated;
the parameter adjusting module is used for adjusting configuration parameters of the signal generating circuit according to the mirror image signal in the feedback signal and a preset adjusting condition so as to reduce the amplitude of the mirror image signal in the output signal of the signal generating circuit;
wherein the feedback signal is generated by a signal feedback circuit from a coupling signal; the coupling signal is obtained by coupling the output signal of the signal generating circuit by the signal feedback circuit after each initial signal component is input into the signal generating circuit.
10. The apparatus according to claim 9, wherein the adjusting the configuration parameters of the signal generating circuit according to the image signal in the feedback signal and the preset adjusting condition comprises:
circularly executing parameter adjustment operation on the configuration parameters corresponding to each path of effective signal component in the signal generation circuit until the adjustment is finished, and storing the adjusted configuration parameters; the effective signal component is a component of an effective signal except an image signal in an output signal of the signal generating circuit;
the parameter adjustment operation comprises: inputting an initial signal component into the signal generating circuit, acquiring a feedback signal output by the signal feedback circuit, judging whether a mirror image signal in the feedback signal meets the preset adjusting condition, if so, finishing the adjustment, otherwise, adjusting the configuration parameter corresponding to the effective signal component in the signal generating circuit;
wherein the preset adjusting condition comprises at least one of the following conditions: when the parameter adjustment operation is executed at this time, the amplitude of the mirror image signal in the feedback signal is smaller than or equal to a preset amplitude; when the parameter adjustment operation is executed this time, the amplitude of the mirror image signal in the feedback signal is larger than the amplitude of the mirror image signal in the feedback signal when the parameter adjustment operation is executed last time; the number of times of performing the parameter adjustment operation is greater than or equal to a preset number of times.
11. The apparatus according to claim 10, wherein the determining whether the image signal in the feedback signal satisfies the preset adjustment condition, if so, the adjusting is finished, otherwise, the adjusting the configuration parameter corresponding to the effective signal component in the signal generating circuit includes:
judging whether the amplitude of the mirror image signal in the feedback signal is smaller than or equal to the preset amplitude, if so, finishing the adjustment, otherwise, judging whether the parameter adjustment operation executed this time is the parameter adjustment operation executed for the first time, and if so, adjusting the configuration parameters corresponding to the effective signal components in the signal generation circuit;
if the parameter adjusting operation is not executed for the first time, judging whether the amplitude of the mirror image signal in the feedback signal is larger than the amplitude of the mirror image signal in the feedback signal when the parameter adjusting operation is executed for the current time, if so, finishing the adjustment, otherwise, judging whether the number of times of executing the parameter adjusting operation is larger than or equal to the preset number;
if the number of times of executing parameter adjustment operation is larger than or equal to the preset number of times, the adjustment is finished, otherwise, the configuration parameters corresponding to the effective signal components in the signal generation circuit are adjusted.
12. The image reject-based signal calibration apparatus of claim 9, wherein the configuration parameter comprises a configuration word corresponding to each valid signal component in the output signal of the signal generation circuit in a digital-to-analog converter (DAC) of the signal generation circuit.
13. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the image rejection based signal calibration method according to any one of claims 1 to 4 when executing the program.
14. A non-transitory readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the image rejection based signal calibration method according to any one of claims 1 to 4.
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