CN115801029B - Method, apparatus and medium for canceling IM2 signal of zero intermediate frequency receiver - Google Patents
Method, apparatus and medium for canceling IM2 signal of zero intermediate frequency receiver Download PDFInfo
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Abstract
The disclosure relates to a method, a device and a medium for eliminating a second-order intermodulation interference signal of a zero intermediate frequency receiver, which are applied to the technical field of signal processing and are used for eliminating the second-order intermodulation interference signal of the zero intermediate frequency receiver. The method for eliminating the second-order intermodulation interference signal of the zero intermediate frequency receiver comprises the following steps: determining a component coefficient of a second-order intermodulation interference signal contained in a signal output by a zero intermediate frequency receiver; acquiring an output signal of a zero intermediate frequency receiver; based on the component coefficients, the output signal is processed to cancel the second order intermodulation interference signal. According to the method, when the second-order intermodulation interference signals of the zero intermediate frequency receiver are eliminated, a detection circuit and a compensation circuit are not required to be added in the circuit, so that the circuit design of the zero intermediate frequency receiver can be simplified, the design cost is saved, and other interference signals with larger amplitude can be avoided.
Description
Technical Field
The present disclosure relates to the field of signal processing technologies, and in particular, to a method, an apparatus, and a medium for eliminating a second-order intermodulation interference signal of a zero intermediate frequency receiver.
Background
In a zero intermediate frequency receiver circuit, factors such as circuit differential adaptation can cause second-order intermodulation (im2) interference signals to appear in an output signal, and the signals can seriously affect the performance of the receiver.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a method, an apparatus, and a medium for eliminating a second-order intermodulation interference signal of a zero intermediate frequency receiver.
According to a first aspect of embodiments of the present disclosure, there is provided a method for canceling a second-order intermodulation interference signal of a zero intermediate frequency receiver, the method including:
determining component coefficients of the second-order intermodulation interference signal contained in a signal output by the zero intermediate frequency receiver;
acquiring an output signal of the zero intermediate frequency receiver;
processing the output signal to cancel the second order intermodulation interference signal based on the component coefficients.
In an exemplary embodiment, the determining component coefficients of the second order intermodulation interference signal contained in the signal output by the zero intermediate frequency receiver comprises:
determining a test input signal input to the zero intermediate frequency receiver;
acquiring a test output signal of the zero intermediate frequency receiver when the test input signal is input;
obtaining the component coefficients based on the test input signal and the test output signal.
In an exemplary embodiment, said obtaining said component coefficients based on said test input signal and said test output signal comprises:
subtracting the test input signal from the test output signal to obtain a test second-order intermodulation interference signal in the test output signal;
and determining the component coefficient according to the test second-order intermodulation interference signal and the test input signal.
In an exemplary embodiment, the determining the component coefficients from the test second order intermodulation interference signal and the test input signal comprises:
determining the component coefficients by:
wherein a represents the component coefficient,
represents the test output signal->
Represents the test input signal, <' > is selected>
Represents said test second order intermodulation interference signal, -is present in>
Representing a modulus value of the test input signal.
In an exemplary embodiment, the processing the output signal based on component coefficients to cancel the second order intermodulation interference signal includes:
determining the second order intermodulation interference signal by:
wherein a represents the component coefficient, m represents the second order intermodulation interference signal, y represents the output signal, and y represents the modulus of the output signal;
subtracting the second order intermodulation interference signal from the output signal to cancel the second order intermodulation interference signal in the output signal.
According to a second aspect of the embodiments of the present disclosure, there is provided an apparatus for canceling a second order intermodulation interference signal of a zero intermediate frequency receiver, the apparatus comprising:
a determining module configured to determine component coefficients of the second order intermodulation interference signal contained in a d signal output by the zero intermediate frequency receiver;
an acquisition module configured to acquire an output signal of the zero intermediate frequency receiver;
a processing module configured to process the output signal based on the component coefficients to cancel the second order intermodulation interference signal.
In an exemplary embodiment, the determining module is further configured to:
determining a test input signal input to the zero intermediate frequency receiver;
acquiring a test output signal of the zero intermediate frequency receiver when the test input signal is input;
obtaining the component coefficients based on the test input signal and the test output signal.
In an exemplary embodiment, the determining module is further configured to:
subtracting the test input signal from the test output signal to obtain a test second-order intermodulation interference signal in the test output signal;
and determining the component coefficient according to the test second-order intermodulation interference signal and the test input signal.
In an exemplary embodiment, the determining module is further configured to:
determining the component coefficients by:
wherein a represents the component coefficient,
represents the test output signal, is present>
Represents the test input signal, <' > is selected>
Represents said test second order intermodulation interference signal, -is present in>
Representing a modulus value of the test input signal.
In an exemplary embodiment, the processing module is further configured to:
determining the second order intermodulation interference signal by:
wherein a represents the component coefficient, m represents the second order intermodulation interference signal, y represents the output signal, and y represents the modulus of the output signal;
subtracting the second order intermodulation interference signal from the output signal to cancel the second order intermodulation interference signal in the output signal.
According to a third aspect of embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium having instructions thereon which, when executed by a processor of an apparatus, enable the apparatus to perform the method according to any one of the first aspect of the embodiments of the present disclosure.
By adopting the method disclosed by the invention, the following beneficial effects are achieved: according to the method, when the second-order intermodulation interference signals of the zero intermediate frequency receiver are eliminated, a detection circuit and a compensation circuit are not required to be added in the circuit, so that the circuit design of the zero intermediate frequency receiver can be simplified, the design cost is saved, and other interference signals with larger amplitude can be avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flow diagram illustrating a method for canceling a second order intermodulation interference signal of a zero intermediate frequency receiver in accordance with an exemplary embodiment;
fig. 2 is a flowchart illustrating a method for determining component coefficients of a second-order intermodulation interference signal included in a signal output from a zero intermediate frequency receiver in step S101 according to an exemplary embodiment;
fig. 3 is a schematic diagram illustrating the input and output of a zero intermediate frequency receiver in accordance with an exemplary embodiment;
FIG. 4 is a flowchart illustrating a method for obtaining the component coefficients based on the test input signal and the test output signal in step S203 according to an exemplary embodiment;
fig. 5 is a schematic diagram illustrating the input and output of a zero intermediate frequency receiver in accordance with an exemplary embodiment;
fig. 6 is a block diagram illustrating an apparatus for canceling a second order intermodulation interference signal of a zero intermediate frequency receiver according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
In the related art, in order to eliminate the second-order intermodulation interference signal, a detection circuit and a compensation circuit are usually added in a zero intermediate frequency receiver analog circuit, the second-order intermodulation interference signal is detected by the detection circuit, the amplitude and the phase of the second-order intermodulation interference signal are adaptively adjusted by the compensation circuit, and the adjusted second-order intermodulation interference signal is superposed on the main signal link, so that the effect of canceling the second-order intermodulation interference signal in the main signal link is realized. However, the added detection circuit and compensation circuit not only increase the cost of the zero intermediate frequency receiver, but also increase the circuit layout area, which is not favorable for the isolation between signals on the circuit board, and is easy to generate other interference signals with larger amplitude.
In an exemplary embodiment of the present disclosure, a method for eliminating a second-order intermodulation interference signal of a zero intermediate frequency receiver is provided. Fig. 1 is a flowchart illustrating a method for canceling a second-order intermodulation interference signal of a zero intermediate frequency receiver according to an exemplary embodiment, as shown in fig. 1, including the steps of:
step S101, determining a component coefficient of a second-order intermodulation interference signal contained in a signal output by a zero intermediate frequency receiver;
step S102, acquiring an output signal of a zero intermediate frequency receiver;
step S103, processing the output signal based on the component coefficient to eliminate the second-order intermodulation interference signal.
In an exemplary embodiment of the present disclosure, in order to overcome the problems of the related art, a method of canceling a second-order intermodulation interference signal of a zero intermediate frequency receiver is provided. Determining a component coefficient of a second-order intermodulation interference signal contained in a signal output by a zero intermediate frequency receiver, acquiring an output signal of the zero intermediate frequency receiver, and processing the output signal based on the component coefficient so as to eliminate the second-order intermodulation interference signal. According to the method, when the second-order intermodulation interference signals of the zero intermediate frequency receiver are eliminated, a detection circuit and a compensation circuit are not required to be added in the circuit, so that the circuit design of the zero intermediate frequency receiver can be simplified, the design cost is saved, and other interference signals with larger amplitude can be avoided.
The zero intermediate frequency receiver is used for converting a received radio frequency signal into a baseband signal, the received radio frequency signal is input into the zero intermediate frequency receiver, and the output is the baseband signal. The size of the second-order intermodulation interference signal is related to the hardware condition of the zero intermediate frequency receiver, the size of the second-order intermodulation interference signal is the same for the zero intermediate frequency receiver with the same hardware condition, and when the hardware condition changes, the size of the second-order intermodulation interference signal also changes. The hardware conditions include gain, frequency point, temperature and the like of the zero intermediate frequency receiver.
In step S101, determining a component coefficient of a second-order intermodulation interference signal included in a signal output by a zero intermediate frequency receiver, that is, a component coefficient of a second-order intermodulation interference signal included in an output signal, where the component coefficients of the zero intermediate frequency receiver under the same hardware condition are the same, and a mapping relationship table between the zero intermediate frequency receiver and the component coefficients under different hardware conditions may be stored in a memory in advance, and in an actual application process, determining a component coefficient corresponding to the zero intermediate frequency receiver under the current hardware condition by querying the mapping relationship table; or the calculation rule of the component coefficient can be stored in the memory in advance, and the component coefficient corresponding to the current zero intermediate frequency receiver is calculated and obtained by calling the calculation rule in the actual application process.
In step S102, the output signal of the zero intermediate frequency receiver is a signal obtained by receiving and processing the radio frequency signal by the zero intermediate frequency receiver, i.e. a baseband signal, and the output signal includes a second-order intermodulation interference signal. To facilitate the calculation of the signal, the output signal is usually a Digital signal converted by an Analog to Digital Converter (ADC).
It should be noted that, in the present disclosure, the execution steps of step S101 and step S102 are not limited, and when the calculation rule of the component coefficient is pre-stored in the memory, and the calculation rule is invoked in the actual application process to calculate and obtain the component coefficient corresponding to the current zero intermediate frequency receiver, it is required to first obtain the output signal of the zero intermediate frequency receiver, and then determine the component coefficient of the second-order intermodulation interference signal included in the signal output by the zero intermediate frequency receiver.
In step S103, after determining the component coefficient of the second-order intermodulation interference signal corresponding to the zero intermediate frequency receiver, the second-order intermodulation interference signal in the output signal is determined according to the component coefficient, and the second-order intermodulation interference signal is separated from the output signal, so that the effect of eliminating the second-order intermodulation interference signal is achieved.
In an exemplary embodiment of the present disclosure, a component coefficient of a second order intermodulation interference signal included in a signal output by a zero intermediate frequency receiver is determined, an output signal of the zero intermediate frequency receiver is obtained, and the output signal is processed based on the component coefficient to eliminate the second order intermodulation interference signal. According to the method, when the second-order intermodulation interference signals of the zero intermediate frequency receiver are eliminated, a detection circuit and a compensation circuit are not required to be added in the circuit, so that the circuit design of the zero intermediate frequency receiver can be simplified, the design cost is saved, and other interference signals with larger amplitude can be avoided.
In an exemplary embodiment, fig. 2 is a flowchart illustrating a method for determining component coefficients of a second-order intermodulation interference signal included in a signal output from a zero intermediate frequency receiver in step S101 according to an exemplary embodiment, as shown in fig. 2, including the following steps:
step S201, determining a test input signal input to a zero intermediate frequency receiver;
step S202, obtaining a test output signal of the zero intermediate frequency receiver when the test input signal is input;
step S203, obtaining the component coefficient based on the test input signal and the test output signal.
Determining a component coefficient of a second-order intermodulation interference signal of the zero intermediate frequency receiver under certain hardware condition through the test signal, recording the hardware condition of the zero intermediate frequency receiver after determining the hardware condition of the zero intermediate frequency receiver, inputting the test input signal into the zero intermediate frequency receiver, and acquiring a test output signal of the zero intermediate frequency receiver corresponding to the test input signal. In order to facilitate signal operation, the test input signal and the test output signal are both digital signals, wherein the test input signal is a known signal, and the test output signal is acquired by the signal acquisition device. Because the test input signal does not contain the second-order intermodulation interference signal, and the test output signal contains the second-order intermodulation interference signal, the test input signal is separated from the test output signal, and the second-order intermodulation interference signal can be obtained, so that the component coefficient is obtained.
FIG. 3 is a schematic diagram illustrating input and output of a zero intermediate frequency receiver, such as the receiver shown in FIG. 3, to test an input signal according to an exemplary embodiment
Input into a zero intermediate frequency receiver and output a test output signal->
The test output signal comprises a test input signal->
And a second order intermodulation interference signal, wherein the second order intermodulation interference signal is generated in the circuit by the test input signal, and when the second order intermodulation interference signal is linearly related to the test input signal, the test output signal and the test input signal satisfy the relation: />
A denotes a component coefficient, based on which>
The modulus of the test input signal is represented, and therefore, the component coefficients can be obtained from the relational expression and the test input signal and the test output signal.
After the component coefficient is obtained, the component coefficient is recorded in a position corresponding to the hardware condition of the zero intermediate frequency receiver, the hardware condition of the zero intermediate frequency receiver is changed, the component coefficient is recalculated, a mapping relation table of the hardware condition of the zero intermediate frequency receiver and the second-order intermodulation interference signal component coefficient is obtained, and the mapping relation table is stored in a memory so that when the mapping relation table is actually applied, the corresponding component coefficient is inquired and obtained from the mapping relation table according to the hardware condition of the current zero intermediate frequency receiver.
In an exemplary embodiment, fig. 4 is a flowchart illustrating a method for obtaining the component coefficients based on the test input signal and the test output signal in step S203 according to an exemplary embodiment, and as shown in fig. 4, the method includes the following steps:
step S401, subtracting the test input signal from the test output signal to obtain a test second-order intermodulation interference signal in the test output signal;
step S402, determining the component coefficient according to the test second-order intermodulation interference signal and the test input signal.
Since the zero intermediate frequency receiver does not change the amplitude of the signal, the difference between the test output signal and the test input signal can be used as a test second-order intermodulation interference signal. And subtracting the test input signal from the test output signal to obtain a test second-order intermodulation interference signal in the test output signal. Because the test second-order intermodulation interference signal is an interference signal generated by inputting a test input signal into the zero intermediate frequency receiver and processing the zero intermediate frequency receiver, a component coefficient can be determined according to the relation between the test second-order intermodulation interference signal and the test input signal. And calculating the relation between the test second-order intermodulation interference signal and the test input signal by adopting a linear correlation relation.
In one example, determining the component coefficients from the test second order intermodulation interference signal and the test input signal comprises:
determining the component coefficients by the formula:
wherein a represents the component coefficient,
represents the test output signal->
Represents said test input signal, <' > is selected>
Represents the test second order intermodulation interference signal, < > or >>
Representing a modulus value of the test input signal.
The test second-order intermodulation interference signal is an interference signal generated by a test input signal in a zero intermediate frequency receiver circuit, the component coefficient of the test second-order intermodulation interference signal is marked as a, and when the test second-order intermodulation interference signal is linearly related to the test input signal, the test second-order intermodulation interference signal can be used
The second-order intermodulation interference signal is shown to be tested, and therefore, the relation is satisfied:
wherein the input signal is tested
And testing the output signal->
Since all the components are known, the component coefficient a can be calculated from the above relation. Based on the row-column relationship between the input signal and the output signal, a formula is derived from the above formula>
Component coefficients are calculated, resulting in a complex number.
It should be noted that, based on the relationship between the test input signal and the second-order intermodulation interference signal, the component coefficient a may also be obtained in other manners, for example, frequency spectrums of the test input signal and the second-order intermodulation interference signal in the frequency domain are respectively calculated, and a value obtained by dividing the frequency spectrum of the second-order intermodulation interference signal and the frequency spectrum of the test input signal is used as the component coefficient.
In an exemplary embodiment, the processing the output signal based on the component coefficients in step S103 to cancel the second order intermodulation interference signal includes:
determining the second order intermodulation interference signal by:
wherein a represents the component coefficient, m represents the second order intermodulation interference signal, y represents the output signal, and y represents the modulus of the output signal;
subtracting the second order intermodulation interference signal from the output signal to cancel the second order intermodulation interference signal in the output signal.
In the practical application process of the zero intermediate frequency receiver, after a component coefficient and an output signal are determined, a second-order intermodulation interference signal contained in the output signal is determined through the component coefficient, and the second-order intermodulation interference signal is determined through the following formula:
where a represents the component coefficient, m represents the second-order intermodulation interference signal, y represents the output signal, and | y | represents a modulus value of the output signal. Since the output signal and the input signal satisfy the relation:a|x| 2 =y-xi.e. byy=x+ a|x| 2 Therefore, the second order intermodulation interference signal is:
subtracting the second-order intermodulation interference signal from the output signal, that is, eliminating the second-order intermodulation interference signal in the output signal, fig. 5 is a schematic input/output diagram of the zero intermediate frequency receiver according to an exemplary embodiment, as shown in fig. 5, where an input signal is denoted as x, an output signal is denoted as y, a square processing module is configured to calculate a square of a modulus value of the output signal to calculate an m value, and an output signal after eliminating the second-order intermodulation interference signal is denoted as z, then:
wherein, a represents the component coefficient of the second order intermodulation interference signal, it can be seen that z no longer includes the second order intermodulation interference signal, although z includes the third order intermodulation interference signal and the fourth order intermodulation interference signal, the component coefficient of the third order intermodulation interference signal is
A component coefficient of the fourth-order intermodulation interference signal is +>
Therefore, the power of the interference signal is much lower than the original second-order intermodulation interference signal, for example, the original second-order intermodulation interference signal is 30dB lower than the main signal, the third-order intermodulation interference signal in z is 60dB lower than the main signal, and the fourth-order intermodulation interference signal is 90dB lower than the main signal, so that the third-order intermodulation interference signal and the fourth-order intermodulation interference signal in z do not affect the performance of the zero intermediate frequency receiver.
In an exemplary embodiment of the present disclosure, an apparatus for canceling a second-order intermodulation interference signal of a zero intermediate frequency receiver is provided. Fig. 6 is a block diagram of an apparatus for canceling a second-order intermodulation interference signal of a zero intermediate frequency receiver according to an exemplary embodiment, shown in fig. 6, including:
a determining module 601 configured to determine component coefficients of the second order intermodulation interference signal included in a signal output by the zero intermediate frequency receiver;
an obtaining module 602 configured to obtain an output signal of the zero intermediate frequency receiver;
a processing module 603 configured to process the output signal based on the component coefficients to cancel the second order intermodulation interference signal.
In an exemplary embodiment, the determining module 601 is further configured to:
determining a test input signal input to the zero intermediate frequency receiver;
acquiring a test output signal of the zero intermediate frequency receiver when the test input signal is input;
based on the test input signal and the test output signal, the component coefficients are obtained.
In an exemplary embodiment, the determining module 601 is further configured to:
subtracting the test input signal from the test output signal to obtain a test second-order intermodulation interference signal in the test output signal;
and determining the component coefficient according to the test second-order intermodulation interference signal and the test input signal.
In an exemplary embodiment, the determining module 601 is further configured to:
determining the component coefficients by the formula:
wherein, a represents the component coefficient,
represents the test output signal->
Represents the test input signal, <' > is selected>
Represents the test second order intermodulation interference signal, < > or >>
Representing a modulus value of the test input signal.
In an exemplary embodiment, the processing module 603 is further configured to:
determining the second order intermodulation interference signal by:
wherein a represents the component coefficient, y represents the output signal, and | y | represents a modulus value of the output signal;
subtracting the second order intermodulation interference signal from the output signal to cancel the second order intermodulation interference signal in the output signal.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
A non-transitory computer readable storage medium having instructions therein which, when executed by a processor of a device, enable the device to perform a method of cancelling a second order intermodulation interference signal of a zero intermediate frequency receiver.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (3)
1. A method for canceling a second order intermodulation interference signal of a zero intermediate frequency receiver, the method comprising:
determining component coefficients of the second-order intermodulation interference signal contained in a signal output by the zero intermediate frequency receiver;
acquiring an output signal of the zero intermediate frequency receiver;
processing the output signal to cancel the second order intermodulation interference signal based on the component coefficients;
the determining component coefficients of the second order intermodulation interference signal contained in a signal output by the zero intermediate frequency receiver comprises:
determining a test input signal input to the zero intermediate frequency receiver;
acquiring a test output signal of the zero intermediate frequency receiver when the test input signal is input;
obtaining the component coefficients based on the test input signal and the test output signal;
said obtaining said component coefficients based on said test input signal and said test output signal comprises:
subtracting the test input signal from the test output signal to obtain a test second-order intermodulation interference signal in the test output signal;
determining the component coefficient according to the test second-order intermodulation interference signal and the test input signal;
the determining the component coefficients from the test second order intermodulation interference signal and the test input signal comprises:
determining the component coefficients by the formula:
the processing the output signal based on the component coefficients to cancel the second order intermodulation interference signal comprises:
determining the second order intermodulation interference signal by:
subtracting the second order intermodulation interference signal from the output signal to cancel the second order intermodulation interference signal in the output signal.
2. An apparatus for canceling a second order intermodulation interference signal of a zero intermediate frequency receiver, the apparatus comprising:
a determining module configured to determine component coefficients of the second order intermodulation interference signal contained in a signal output by the zero intermediate frequency receiver;
an acquisition module configured to acquire an output signal of the zero intermediate frequency receiver;
a processing module configured to process the output signal based on the component coefficients to cancel the second order intermodulation interference signal;
the determination module is further configured to:
determining a test input signal input to the zero intermediate frequency receiver;
acquiring a test output signal of the zero intermediate frequency receiver when the test input signal is input;
obtaining the component coefficients based on the test input signal and the test output signal;
the determination module is further configured to:
subtracting the test input signal from the test output signal to obtain a test second-order intermodulation interference signal in the test output signal;
determining the component coefficient according to the test second-order intermodulation interference signal and the test input signal;
the determination module is further configured to:
determining the component coefficients by:
the processing module is further configured to:
determining the second order intermodulation interference signal by:
subtracting the second order intermodulation interference signal from the output signal to cancel the second order intermodulation interference signal in the output signal.
3. A non-transitory computer readable storage medium having instructions therein which, when executed by a processor of an apparatus, enable the apparatus to perform the method of claim 1.
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| 方俊 等.零中频接收机DC偏移和IM2消除的探讨.桂林电子工业学院学报.2004,第24卷(第3期),全文. * |
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