CN117560026A - Signal correction method and device for receiver, electronic equipment and storage medium - Google Patents
Signal correction method and device for receiver, electronic equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
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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
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- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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Abstract
The embodiment of the application provides a signal correction method, a device, electronic equipment and a storage medium of a receiver, wherein the signal correction method comprises the following steps: acquiring a digital signal of a receiver; performing filtering compensation processing on the digital signal according to the frequency parameter of the receiver to obtain a filtered signal; reconstructing the filtering signal according to a preset correction parameter to obtain an image interference signal; and correcting the digital signal according to the image interference signal to obtain a correction signal. The embodiment can realize the correction of the signal of the receiver only by a small amount of digital logic, the correction process is simple, and the area of an analog circuit is not required to be increased.
Description
Technical Field
The present invention relates to the field of electronic communications technologies, and in particular, to a signal correction method and apparatus for a receiver, an electronic device, and a computer readable storage medium.
Background
Low intermediate frequency receivers are a common architecture in communication systems that can reduce the effects of IQ imbalance and dc offset. The low intermediate frequency architecture typically performs a secondary down-conversion after the analog-to-digital conversion, with the secondary down-conversion circuit including a frequency-adjustable digital mixer.
If there is an interference signal at the image position of the intermediate frequency signal in the receiver, the interference signal will generate two kinds of interference signals, one is the adjacent channel interference signal and the other is the image interference signal, for the analog signal output by the digital mixer.
For the adjacent channel interference signals, a part of the adjacent channel interference signals can be filtered through a complex Butterworth filter, and then the adjacent channel interference signals can be further well inhibited through secondary filtering of a subsequent digital filter. For image disturbance signals, the rejection is guaranteed by means of the orthogonality of the analog mixers. If the IQ two paths of signals of the analog mixer are completely orthogonal, no image interference exists, otherwise, the generated image interference can fall in the signal bandwidth exactly and cannot be filtered by a subsequent filter, so that the demodulation performance is affected. However, during actual operation of the receiver, the physical limitations of the circuit hardware and the unavoidable errors in designing the circuit will cause the amplitudes and phases of the I and Q signals to deviate, i.e., IQ imbalance.
In response to this difficulty, in an intermediate frequency receiver, an IQ correction algorithm can be used for compensation.
For low intermediate frequency receivers, the existing IQ correction algorithm corrects the complex filter by an additional analog circuit, which is relatively complex and increases the analog circuit area.
Disclosure of Invention
An object of the embodiments of the present application is to provide a signal correction method, apparatus, electronic device, and storage medium for a receiver, where correction of a signal of the receiver can be implemented only by a small amount of digital logic, and the correction process is simple, without increasing an area of an analog circuit.
In a first aspect, an embodiment of the present application provides a signal correction method of a receiver, including:
acquiring a digital signal of a receiver;
performing filtering compensation processing on the digital signal according to the frequency parameter of the receiver to obtain a filtered signal;
reconstructing the filtering signal according to a preset correction parameter to obtain an image interference signal;
and correcting the digital signal according to the image interference signal to obtain a correction signal.
In the implementation process, filtering compensation is carried out on the digital signal according to the frequency parameter of the receiver, and compensation processing is carried out on the filtering signal according to the preset correction parameter to obtain an image interference signal; and correcting the digital signal according to the image interference signal to obtain a correction signal. The above steps are accomplished primarily by digital logic without requiring a substantial increase in the area of the analog circuitry of the receiver. Meanwhile, the frequency parameter and the preset correction parameter are parameters which can be determined quickly, so that the signal correction method of the receiver provided by the embodiment of the application is simple in correction process and can complete signal correction of the receiver quickly.
Further, the digital signal is obtained after the receiver preprocesses the received analog signal;
the filtering compensation processing is performed on the digital signal according to the frequency parameter of the receiver, so as to obtain a filtered signal, which comprises the following steps:
if the analog band-pass filter is utilized to filter the analog signal in the preprocessing process, the digital signal is subjected to filtering compensation processing according to the frequency parameter of the receiver, and a filtered signal is obtained;
reconstructing the filtered signal according to a preset correction parameter to obtain an image interference signal, including:
if the analog band-pass filter is utilized to filter the analog signal in the preprocessing process, the conjugation processing is carried out on the filtered signal to obtain a conjugated signal, and the compensation processing is carried out on the conjugated signal according to the preset correction parameters to obtain an image interference signal;
and if the digital signal is not filtered by the analog band-pass filter in the pretreatment process, carrying out conjugate processing on the digital signal to obtain a conjugate signal, and carrying out compensation processing on the conjugate signal according to a preset correction parameter to obtain an image interference signal.
In the implementation process, whether to use the analog band-pass filter to filter the analog signal corresponds to different working modes of the low intermediate frequency receiver, and types of interference signals in the analog signal output by the digital mixer in different working modes are different.
Further, the filtering compensation processing is performed on the digital signal according to the frequency parameter of the receiver, so as to obtain a filtered signal, which includes:
generating parameters of a first filter and parameters and filtering compensation parameters of a second filter according to parameters of a radio frequency mixer of a receiver;
and carrying out filtering compensation processing on the digital signal according to the first filter, the second filter and the filtering compensation parameter to obtain the filtering signal.
In the implementation process, the parameters of the first filter, the parameters of the second filter and the filtering compensation parameters are generated through the parameters of the radio frequency mixer and the parameters of the analog band-pass filter of the receiver, the analog signals are subjected to filtering compensation according to the first filter, the second filter and the filtering compensation parameters, and filtering signals are obtained.
Further, the generating the parameters of the first filter and the parameters of the second filter and the filter compensation parameters according to the parameters of the radio frequency mixer of the receiver includes:
Determining a center frequency of the first filter as a negative number of a frequency of an intermediate frequency signal of a radio frequency mixer of the receiver;
determining the center frequency of the second filter as a preset multiple of the center frequency of the first filter;
determining attenuation values of cascade frequency responses of an analog band-pass filter, the first filter and the second filter used in the preprocessing process at the center frequency of the first filter as the filtering compensation parameters;
the filtering compensation processing is performed on the digital signal according to the first filter, the second filter and the filtering compensation parameter to obtain the filtered signal, including:
filtering the digital signal by using the first filter and the second filter to obtain a filtered signal;
and compensating the filtered signal by using the filtering compensation parameter to obtain the filtering signal.
In the implementation process, the first filter and the second filter are utilized to filter the digital signals to obtain the filtered signals, the filtered signals are compensated by utilizing the filtering compensation parameters to obtain the filtered signals, and the steps are easy to implement by using digital logic, so that the area of an analog circuit in a chip can be effectively reduced.
Further, the preset correction parameters include: gain adjustment and phase rotation parameters;
the compensation processing is performed on the conjugate signal according to a preset correction parameter to obtain a mirror image interference signal, including:
the conjugate signal is subjected to correction processing according to the following formula:
i=1, 2,3, ·n, N is a positive integer;
wherein A is 3 (i) Is a mirrorLike the value of the ith point of the interference signal, A 2 (i) The value of the i-th point of the conjugate signal, g d2 Omega for gain adjustment parameters d2 Is a phase rotation parameter.
Further, the preset correction parameters are obtained by the following method:
receiving a test signal;
acquiring the amplitude ratio of a Q path signal to an I path signal in a test signal;
generating a first preset correction parameter according to the amplitude ratio of the Q-channel signal to the I-channel signal in the test signal and a preset first phase difference of the I-channel signal and the Q-channel signal in the test signal;
generating a first signal sequence according to a first preset correction parameter;
acquiring a frequency spectrum of the first signal sequence;
acquiring a first power difference corresponding to a first frequency point and a second frequency point in the frequency spectrum of the first signal sequence;
generating a second phase difference of the I path signal and the Q path signal in the test signal according to the first power difference;
Generating a second preset correction parameter according to the amplitude ratio of the Q-channel signal to the I-channel signal in the test signal and the second phase difference of the I-channel signal and the Q-channel signal in the test signal;
generating a second signal sequence according to the second preset correction parameters;
acquiring a second power difference corresponding to the first frequency point and the second frequency point in the frequency spectrum of the second signal sequence;
and generating the preset correction parameters according to the first power difference, the second power difference and the second preset correction parameters.
In the implementation process, a method for generating the preset correction parameters is provided, and the preset correction parameters can be determined during the production of the receiver, so that the digital signal of the receiver can be quickly corrected based on the preset correction parameters in the subsequent working process of the receiver.
Further, the first preset correction parameter and the second preset correction parameter are generated by the following formulas:
wherein g d1 、ω d1 For the first preset correction parameter(s),a first phase difference preset for the I path signal and the Q path signal in the test signal, or g d1 、ω d1 For said second preset correction parameter, < >>G is the second phase difference of the I-path signal and the Q-path signal in the test signal 1 And the amplitude ratio of the Q paths of signals and the I paths of signals in the test signal is set.
Further, a second phase difference of the I-path signal and the Q-path signal in the test signal is generated by the following formula:
r＝10 ΔP/10 ；
wherein,for the second phase difference, ΔP is the first power difference, g 1 And the amplitude ratio of the Q paths of signals and the I paths of signals in the test signal is set.
Further, the generating the preset correction parameter according to the first power difference, the second power difference and the second preset correction parameter includes:
if the second power difference is larger than the first power difference, taking the second preset correction parameter as the preset correction parameter, and if the second power difference is smaller than or equal to the first power difference, taking the second phase difference out of the opposite number to obtain a third phase difference;
and acquiring the preset correction parameters according to the third phase difference and a preset formula.
In a second aspect, an electronic device provided in an embodiment of the present application includes: a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to any one of the first aspects when the computer program is executed.
In a third aspect, embodiments of the present application provide a computer-readable storage medium having instructions stored thereon, which when executed on a computer, cause the computer to perform the method according to any of the first aspects.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the techniques disclosed herein.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a signal correction method of a receiver according to an embodiment of the present application;
Fig. 2 is a schematic structural diagram of a receiver according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a filtering compensation process according to an embodiment of the present application;
FIG. 4 is a graph of a spectrum provided in an embodiment of the present application;
FIG. 5 is another spectrum diagram provided in an embodiment of the present application;
FIG. 6 is another spectrum diagram provided in an embodiment of the present application;
FIG. 7 is another spectrum diagram provided in an embodiment of the present application;
FIG. 8 is another spectrum diagram provided in an embodiment of the present application;
FIG. 9 is another spectrum diagram provided in an embodiment of the present application;
fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, an embodiment of the present application provides a signal correction method of a receiver, which can be applied to a server or an electronic device or a computer readable storage medium or a digital logic circuit or a processor, and is used for correcting a digital signal of a low intermediate frequency receiver. The server may be an independent server or a server cluster formed by a plurality of servers, and may also be a cloud server for providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDNs, basic cloud computing services such as big data and artificial intelligent sampling point devices, and the like. Referring to fig. 1, the method includes:
S1: acquiring a digital signal of a receiver;
s2: performing filtering compensation processing on the digital signal according to the frequency parameter of the receiver to obtain a filtered signal;
s3: reconstructing the filtering signal according to a preset correction parameter to obtain an image interference signal;
s4: and correcting the digital signal according to the image interference signal to obtain a correction signal.
In the above embodiments, the receiver refers to a low intermediate frequency receiver in which the IQ signal imbalance has the same effect on the phase and amplitude of the relevant signals in the receiver, and the IQ imbalance is independent of frequency, which is caused by the local oscillator of the low intermediate frequency receiver. The IQ signal is also called as a homodromous quadrature signal, I is in-phase, Q is quadrature, and the phase difference between the IQ signal and the quadrature signal is 90 degrees.
For example, referring to fig. 2, which is a schematic structural diagram of a low intermediate frequency receiver according to an embodiment of the present application, an IQ mismatch correction module in fig. 2 is an implementation body of a method provided by an embodiment of the present application, and the IQ mismatch correction module may be one or more of an electronic device, a server, a computer readable storage medium, a processor, and a digital logic circuit. In some embodiments, the IQ mismatch correction module may be a processor, and the components in fig. 2 other than the IQ mismatch correction module are existing structures of the low intermediate frequency receiver.
In an application scene, a low noise amplifier receives a radio frequency signal, a radio frequency mixer carries out quadrature down-conversion on the radio frequency signal to an intermediate frequency signal to obtain two paths of intermediate frequency quadrature signals (the two paths of intermediate frequency quadrature signals are not ideal quadrature signals and have errors), an analog intermediate frequency filter (an intermediate frequency analog bandpass filter or a low pass filter is used for realizing channel filtering), external noise and interference signals of the two paths of intermediate frequency quadrature signals are removed, an analog-digital converter is used for converting the analog signal to a digital signal (which can be expressed as A (I) =I (I) +j Q (I)), and a processor carries out filtering compensation processing on the digital signal according to frequency parameters of a receiver after receiving the digital signal to obtain a filtering signal, and reconstruction processing is carried out on the filtering signal according to preset correction parameters to obtain an image interference signal; and correcting the digital signal according to the image interference signal to obtain a correction signal. The random access memory is used for storing intermediate operation results of the processor. The processor then inputs the correction signal to a digital intermediate frequency synthesizer that outputs a Real signal (I signal) and an imaginary imag signal (Q signal) to obtain a useful baseband signal.
In the implementation process, filtering compensation is carried out on the digital signal according to the frequency parameter of the receiver, and compensation processing is carried out on the filtering signal according to the preset correction parameter to obtain an image interference signal; and correcting the digital signal according to the preset correction parameters and the image interference signal to obtain a correction signal. The above steps are accomplished primarily by digital logic without requiring a substantial increase in the area of the analog circuitry of the receiver. Meanwhile, the frequency parameter and the preset correction parameter are parameters which can be determined quickly, so that the signal correction method of the receiver provided by the embodiment of the application is simple in correction process and can complete signal correction of the receiver quickly.
In some embodiments, S4 comprises: and subtracting the image interference signal from the digital signal to obtain a correction signal.
In some embodiments, S1 comprises: generating parameters of a first filter and parameters and filtering compensation parameters of a second filter according to parameters of a radio frequency mixer of a receiver; and carrying out filtering compensation processing on the digital signal according to the first filter, the second filter and the filtering compensation parameter to obtain the filtering signal.
In the implementation process, the parameters of the first filter, the parameters of the second filter and the filtering compensation parameters are generated through the parameters of the radio frequency mixer and the parameters of the analog band-pass filter of the receiver, the analog signals are subjected to filtering compensation according to the first filter, the second filter and the filtering compensation parameters, and filtering signals are obtained.
In some embodiments, the generating the parameters of the first filter and the parameters of the second filter and the filter compensation parameters according to the parameters of the radio frequency mixer of the receiver includes: determining a center frequency of the first filter as a negative number of a frequency of an intermediate frequency signal of a radio frequency mixer of the receiver; determining the center frequency of the second filter as a preset multiple of the center frequency of the first filter; determining attenuation values of cascade frequency responses of an analog band-pass filter, the first filter and the second filter used in the preprocessing process at the center frequency of the first filter as the filtering compensation parameters; the filtering compensation processing is performed on the digital signal according to the first filter, the second filter and the filtering compensation parameter to obtain the filtered signal, including: filtering the digital signal by using the first filter and the second filter to obtain a filtered signal; and compensating the filtered signal by using the filtering compensation parameter to obtain the filtering signal.
The rf mixer is mainly a power device for converting the frequency of an rf signal with one frequency into another frequency, so that the information processing is easier and the cost is lower. In addition to generating new frequency signals, other characteristics of the original signals are maintained to enable reception or transmission.
Typically, the three ports on the mixer are a Radio Frequency (RF) port, a local oscillator port (LO), and an intermediate frequency port (IF). The Radio Frequency (RF) port receives the radio frequency signal (i.e., the amplified antenna signal) output by the low noise amplifier, the Local Oscillator (LO) port is used for inputting the local carrier signal generated by the local oscillator, and the mixer multiplies the radio frequency signal and the local carrier signal to obtain a down-conversion signal, i.e., the intermediate frequency signal IF.
Illustratively, referring to FIG. 2, assume that after the low noise amplifier LNA receives the radio frequency signal, the radio frequency signal is input to a radio frequency mixer, which quadrature downconverts the radio frequency signal to cos ω IF t and sin omega IF t (ideal case), wherein ω IF ＝2πf IF ，f IF Is the frequency of the intermediate frequency signal of the radio frequency mixer, which is settable and is therefore also referred to as the frequency of the variable intermediate frequency signal.
If the analog filter at the front end of the system adopts analog band-pass filteringThe filter (i.e. the analog bandpass filter is used to filter the digital signal during preprocessing), the center frequency of bandpass filtering is generally set at f IF . The center frequency of the first filter is-f IF The center frequency of the second filter is-3*f IF . According to the frequency response curve of the analog band-pass filter, the first filter and the second filter, which are cascaded, the frequency-f of the signal after the signal passes through the filtering system is determined IF And (5) the lost intensity, and performing filter gain compensation processing according to the intensity.
Referring to fig. 3, if the frequency of the intermediate frequency signal of the radio frequency mixer is 6MHz, the center frequency of the analog band pass filter should be 6MHz, the center frequency of the first filter is-6 MHz, and the center frequency of the second filter is-18 MHz.
In the implementation process, the first filter and the second filter are utilized to filter the digital signals to obtain the filtered signals, the filtered signals are compensated by utilizing the filtering compensation parameters to obtain the filtered signals, and the steps are easy to implement by using digital logic, so that the area of an analog circuit in a chip can be effectively reduced.
In some embodiments, the predetermined multiple is N, which is a natural number.
In some embodiments, the preset multiple is 3.
In some embodiments, the filter compensation parameters are obtained by: acquiring a cascade frequency response curve of a filtering system formed by the analog filter, the first filter and the second filter; and determining the loss intensity of the signal after passing through the filtering system according to the cascade frequency response curve.
Illustratively, referring to FIG. 3, the digital signal is processed using a first filter, a second filter, and a gain compensation module, the radio frequency mixer has a center frequency of 6MHz, and the first filter has a center frequency of-6 MHz and the second filter has a center frequency of-18 MHz. And drawing a cascade frequency response curve of a filtering system formed by the analog band-pass filter, the first filter and the second filter, determining that the strength of the loss of a signal at a frequency point of-6 MHz after passing through the filtering system is 36.5dB according to the frequency response curve, and determining that the gain compensation coefficient is 36.5dB according to the strength.
In some embodiments, the digital signal is obtained after preprocessing the received analog signal by the receiver.
Illustratively, referring to FIG. 2, the preprocessing process includes: the low noise amplifier LNA receives the radio frequency signal, the radio frequency mixer orthogonally down-converts the radio frequency signal to the intermediate frequency signal, two paths of intermediate frequency orthogonal signals (which are not ideal orthogonal signals and have errors) are obtained, channel filtering is realized through the intermediate frequency analog band-pass filter BPF or the low pass filter LPF, external noise and interference signals of the two paths of intermediate frequency orthogonal signals are removed, and the analog signal is converted into a digital signal through the analog-digital converter.
Based on this, S1 includes: if the analog band-pass filter is utilized to filter the analog signal in the preprocessing process, the digital signal is subjected to filtering compensation processing according to the frequency parameter of the receiver, and a filtered signal is obtained; if the analog low-pass filter is utilized to filter the analog signal in the preprocessing process, the digital signal does not need to be subjected to filtering compensation processing according to the frequency parameter of the receiver; s2 comprises the following steps: if the analog band-pass filter is utilized to filter the analog signal in the preprocessing process, the conjugation processing is carried out on the filtered signal to obtain a conjugated signal, and the compensation processing is carried out on the conjugated signal according to the preset correction parameters to obtain an image interference signal; and if the digital signal is not filtered by the analog band-pass filter in the pretreatment process, carrying out conjugate processing on the digital signal to obtain a conjugate signal, and carrying out compensation processing on the conjugate signal according to a preset correction parameter to obtain an image interference signal.
For example, referring to fig. 4, based on the low-and-medium frequency receiver structure of fig. 2, if no band-pass filter is used in the preprocessing process, in the case that there is interference at the image frequency position of the radio frequency mixer, the spectrum of the output signal of the radio frequency mixer is the same as that of the radio frequency mixer, the spectrum after conjugation is taken as shown in fig. 5, the spectrum of the signal after phase adjustment and subtraction is taken as shown in fig. 6, and the spectrum of the interference-free signal obtained after processing by the digital mixer and the low-pass filter LPF is shown in fig. 7. If a band-pass filter is used in the preprocessing process, a spectrum diagram of the signal output by the mixer is shown in fig. 8, and a spectrum filtered by the band-pass filter is shown in fig. 9. Therefore, image suppression cannot be performed by simple gain and phase rotation after signal conjugation. It is necessary to recover the image signal before the rejection is completed.
In the implementation process, whether to use the analog band-pass filter to filter the analog signal corresponds to different working modes of the low intermediate frequency receiver, and types of interference signals in the analog signal output by the digital mixer in different working modes are different.
In some embodiments, the compensating the conjugate signal according to a preset correction parameter to obtain an image interference signal includes:
the conjugate signal is subjected to correction processing according to the following formula:
i=1, 2,3,..n, N is a positive integer;
wherein A is 3 (i) Is the value of the ith point of the mirror image interference signal, A 2 (i) The value of the i-th point of the conjugate signal, g d2 Omega for gain adjustment parameters d2 Is a phase rotation parameter.
The embodiment of the application also provides a method for determining the gain adjustment parameter and the phase rotation parameter, which comprises the following steps: receiving a test signal; acquiring the amplitude ratio of a Q path signal to an I path signal in a test signal; generating a first preset correction parameter according to the amplitude ratio of the I path signal to the Q path signal in the test signal and a preset first phase difference of the I path signal and the Q path signal in the test signal; generating a first signal sequence according to a first preset correction parameter; acquiring a frequency spectrum of a first signal sequence; acquiring a first power difference corresponding to a first frequency point and a second frequency point in a frequency spectrum of a first signal sequence; generating a second phase difference of the I path signal and the Q path signal in the test signal according to the first power difference; generating a second preset correction parameter according to the amplitude ratio of the I path signal to the Q path signal in the test signal and the second phase difference of the I path signal and the Q path signal in the test signal; generating a second signal sequence according to a second preset correction parameter; acquiring a second power difference corresponding to the first frequency point and the second frequency point in the frequency spectrum of the second signal sequence; and generating preset correction parameters according to the first power difference, the second power difference and the second preset correction parameters.
In some embodiments, taking the radio frequency chip corresponding to the receiver structure of fig. 2 as an example, before receiving the test signal, the method includes: configuring the chip into a receiving mode, so that the chip can receive an external test signal; adding an interference signal at the mirror image position of the radio frequency signal as a test signal at the antenna input end of the chip through a measuring instrument; if the analog intermediate frequency filter of the radio frequency chip only supports analog band-pass filtering, the filter of the chip is closed, and the signal receiving mode of the chip is configured to be signal through, namely the radio frequency chip does not pass through the intermediate frequency filter after receiving the signal and directly transmits the signal to the analog-to-digital converter; if the analog intermediate frequency filter supports analog low-pass filtering, the mode of the radio frequency chip is switched to analog low-pass filtering, namely the radio frequency chip carries out low-pass filtering on the received test signal through the analog low-pass filter; the analog-to-digital converter is configured to communicate with the test mode of the random access memory so that the random access memory can sample the signal output by the analog-to-digital converter to obtain a sampled signal.
It will be appreciated that after the test signal is obtained, the test signal is further sampled, so as to obtain a sampled signal, and the Q-channel signal and the I-channel signal in the test signal mentioned in the method for determining the gain adjustment parameter and the phase rotation parameter are actually sampled signals of the Q-channel signal and the I-channel signal.
In the implementation process, a method for generating the preset correction parameters is provided, and the preset correction parameters can be determined during the production of the receiver, so that the digital signal of the receiver can be quickly corrected based on the preset correction parameters in the subsequent working process of the receiver.
Further, the first signal sequence and the second signal sequence are generated by the following formula:
i=1, 2,3,..n, N is a positive integer;
wherein A is 1 (i) For the sample value of the ith point of the first signal sequence, I 1 (i) Sampling values of the ith point of the I-path signal in the first signal sequence; q (Q) 1 (i) Sampling values of the ith point of the Q paths of signals in the first signal sequence; g d1 For the gain adjustment parameter, ω, of the first preset correction parameters d1 For the phase rotation parameter in the first preset correction parameter, or A 1 (i) Is the sampling value of the ith point of the second signal sequence, I 1 (i) Sampling values of the ith point of the I-path signal in the second signal sequence; q (Q) 1 (i) Sampling values of the ith point of the Q paths of signals in the second signal sequence; g d1 For the gain adjustment parameter, ω, in the second preset correction parameter d2 Is the phase rotation parameter in the second preset correction parameter.
Further, the first preset correction parameter and the second preset correction parameter are generated by the following formulas:
Wherein g d1 、ω d1 For the first preset correction parameter(s),a first phase difference preset for the I path signal and the Q path signal in the test signal, or g d1 、ω d1 For a second preset correction parameter, +.>G is the second phase difference of the I-path signal and the Q-path signal in the test signal 1 The amplitude ratio of the Q-channel signal to the I-channel signal in the test signal is the amplitude ratio of the I-channel signal to the Q-channel signal. In some embodimentsIn the test signal, the I-path signal and the Q-path signal are sine waves, and the amplitude refers to the peak value of the sine waves.
In some embodiments, the first phase difference is 0 °.
Further, before the amplitude ratio of the Q-channel signal and the I-channel signal in the test signal is obtained, the method includes: sampling the I-path signal and the Q-path signal of the test signal to obtain an expression of the I-path signal and sampling values of the Q-path signal, wherein the sampling number can be 2 N Point, n=11, 12, 13, 14 …, N may be a positive integer greater than 11.
Further, the first frequency point and the second frequency point are respectively-f IF And f IF Wherein f IF Is the frequency of the intermediate frequency signal of the radio frequency mixer.
Further, generating a second phase difference of the I-path signal and the Q-path signal according to the first power difference, including:
generating a second phase difference of the I-path signal and the Q-path signal in the test signal by the following formula:
r＝10 ΔP/10 ；
Wherein,for the second phase difference, ΔP is the first power difference, g 1 The amplitude ratio of the I path signal and the Q path signal in the test signal.
Further, generating a preset correction parameter according to the first power difference, the second power difference and the second preset correction parameter includes: if the second power difference is larger than the first power difference, taking the second preset correction parameter as the preset correction parameter; and if the second power difference is smaller than or equal to the first power difference, taking the second phase difference as the opposite number to obtain a third phase difference, and acquiring a preset correction parameter according to the third phase difference and a preset formula. That is, the preset correction parameters are obtained according to the following formula:wherein g d 、ω d For presetting correction parameters, ++>A third phase difference of the I-path signal and the Q-path signal, or g d 、ω d G is a third preset correction parameter 1 The amplitude ratio of the Q path signal and the I path signal in the test signal.
The application further provides an electronic device, please refer to fig. 10, and fig. 10 is a block diagram of an electronic device according to an embodiment of the application. The electronic device may include a processor 101, a communication interface 102, a memory 103, and at least one communication bus 104. Wherein the communication bus 104 is used to enable direct connection communication of these components. The communication interface 102 of the electronic device in the embodiment of the present application is used for performing signaling or data communication with other node devices. The processor 101 may be an integrated circuit chip with signal processing capabilities.
The processor 101 may be a general-purpose processor, including a central processing unit (CPU, central Processing Unit), a network processor (NP, network Processor), and the like; but may also be a Digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor 101 may be any conventional processor or the like.
The Memory 103 may be, but is not limited to, random access Memory (RAM, random Access Memory), read Only Memory (ROM), programmable Read Only Memory (PROM, programmable Read-Only Memory), erasable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable Read Only Memory (EEPROM, electric Erasable Programmable Read-Only Memory), and the like. The memory 103 has stored therein computer readable instructions which, when executed by the processor 101, can cause the electronic device to perform the steps involved in the above-described method embodiments.
Optionally, the electronic device may further include a storage controller, an input-output unit.
The memory 103, the memory controller, the processor 101, the peripheral interface, and the input/output unit are electrically connected directly or indirectly to each other, so as to realize data transmission or interaction. For example, the elements may be electrically coupled to each other via one or more communication buses 104. The processor 101 is configured to execute executable modules stored in the memory 103, such as software functional modules or computer programs included in the electronic device.
The input-output unit is used for providing the user with the creation task and creating the starting selectable period or the preset execution time for the task so as to realize the interaction between the user and the server. The input/output unit may be, but is not limited to, a mouse, a keyboard, and the like.
It will be appreciated that the configuration shown in fig. 10 is merely illustrative, and that the electronic device may also include more or fewer components than shown in fig. 10, or have a different configuration than shown in fig. 10. The components shown in fig. 10 may be implemented in hardware, software, or a combination thereof.
The embodiment of the present application further provides a storage medium, on which instructions are stored, and when the instructions are executed on a computer, the computer program implements the method of the method embodiment when executed by a processor, and in order to avoid repetition, details are not repeated here.
The present application also provides a computer program product which, when run on a computer, causes the computer to perform the method of the method embodiments.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners as well. The apparatus embodiments described above are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above is only an example of the present application, and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
Claims (11)
1. A method for signal correction in a receiver, comprising: acquiring a digital signal of a receiver;
performing filtering compensation processing on the digital signal according to the frequency parameter of the receiver to obtain a filtered signal;
reconstructing the filtering signal according to a preset correction parameter to obtain an image interference signal;
and correcting the digital signal according to the image interference signal to obtain a correction signal.
2. The signal correction method of a receiver according to claim 1, wherein the digital signal is obtained after preprocessing a received analog signal by the receiver;
the filtering compensation processing is performed on the digital signal according to the frequency parameter of the receiver, so as to obtain a filtered signal, which comprises the following steps:
if the analog band-pass filter is utilized to filter the analog signal in the preprocessing process, the digital signal is subjected to filtering compensation processing according to the frequency parameter of the receiver, and a filtered signal is obtained;
reconstructing the filtered signal according to a preset correction parameter to obtain an image interference signal, including:
if the analog band-pass filter is utilized to filter the analog signal in the preprocessing process, the conjugation processing is carried out on the filtered signal to obtain a conjugated signal, and the compensation processing is carried out on the conjugated signal according to the preset correction parameters to obtain an image interference signal;
And if the digital signal is not filtered by the analog band-pass filter in the pretreatment process, carrying out conjugate processing on the digital signal to obtain a conjugate signal, and carrying out compensation processing on the conjugate signal according to a preset correction parameter to obtain an image interference signal.
3. The signal correction method of a receiver according to claim 1, wherein the filtering compensation processing is performed on the digital signal according to a frequency parameter of the receiver to obtain a filtered signal, and the method comprises:
generating parameters of a first filter and parameters and filtering compensation parameters of a second filter according to parameters of a radio frequency mixer of a receiver;
and carrying out filtering compensation processing on the digital signal according to the first filter, the second filter and the filtering compensation parameter to obtain the filtering signal.
4. The method for signal correction of a receiver according to claim 2, wherein,
the generating parameters of the first filter and parameters and filtering compensation parameters of the second filter according to parameters of a radio frequency mixer of the receiver comprises:
determining a center frequency of the first filter as a negative number of a frequency of an intermediate frequency signal of a radio frequency mixer of the receiver;
Determining the center frequency of the second filter as a preset multiple of the center frequency of the first filter;
determining attenuation values of cascade frequency responses of an analog band-pass filter, the first filter and the second filter used in the preprocessing process at the center frequency of the first filter as the filtering compensation parameters;
the filtering compensation processing is performed on the digital signal according to the first filter, the second filter and the filtering compensation parameter to obtain the filtered signal, including:
filtering the digital signal by using the first filter and the second filter to obtain a filtered signal;
and compensating the filtered signal by using the filtering compensation parameter to obtain the filtering signal.
5. The signal correction method of a receiver according to claim 2, wherein the preset correction parameters include: gain adjustment and phase rotation parameters;
the compensation processing is performed on the conjugate signal according to a preset correction parameter to obtain a mirror image interference signal, including:
the conjugate signal is subjected to correction processing according to the following formula:
n is a positive integer;
Wherein A is 3 (i) Is the value of the ith point of the mirror image interference signal, A 2 (i) The value of the i-th point of the conjugate signal, g d2 Omega for gain adjustment parameters d2 Is a phase rotation parameter.
6. The signal correction method of a receiver according to claim 1, wherein the preset correction parameters are obtained by:
receiving a test signal;
acquiring the amplitude ratio of a Q path signal to an I path signal in a test signal;
generating a first preset correction parameter according to the amplitude ratio of the Q-channel signal to the I-channel signal in the test signal and a preset first phase difference of the I-channel signal and the Q-channel signal in the test signal;
generating a first signal sequence according to a first preset correction parameter;
acquiring a frequency spectrum of the first signal sequence;
acquiring a first power difference corresponding to a first frequency point and a second frequency point in the frequency spectrum of the first signal sequence;
generating a second phase difference of the I path signal and the Q path signal in the test signal according to the first power difference;
generating a second preset correction parameter according to the amplitude ratio of the Q-channel signal to the I-channel signal in the test signal and the second phase difference of the I-channel signal and the Q-channel signal in the test signal;
generating a second signal sequence according to the second preset correction parameters;
Acquiring a second power difference corresponding to the first frequency point and the second frequency point in the frequency spectrum of the second signal sequence;
and generating the preset correction parameters according to the first power difference, the second power difference and the second preset correction parameters.
7. The signal correction method of a receiver according to claim 6, wherein the first preset correction parameter and the second preset correction parameter are generated by the following formulas:
wherein g d1 、ω d1 For the first preset correction parameter(s),a first phase difference preset for the I path signal and the Q path signal in the test signal, or g d1 、ω d1 For said second preset correction parameter, < >>G is the second phase difference of the I-path signal and the Q-path signal in the test signal 1 And the amplitude ratio of the Q paths of signals and the I paths of signals in the test signal is set.
8. The method for signal correction of a receiver according to claim 6, wherein,
generating a second phase difference of the I-path signal and the Q-path signal in the test signal by the following formula:
r＝10 ΔP/10 ；
wherein,for the second phase difference, ΔP is the first power difference, g 1 And the amplitude ratio of the Q paths of signals and the I paths of signals in the test signal is set.
9. The signal correction method of a receiver according to claim 8, wherein said generating the preset correction parameters from the first power difference, the second power difference, and the second preset correction parameters comprises:
If the second power difference is larger than the first power difference, taking the second preset correction parameter as the preset correction parameter, and if the second power difference is smaller than or equal to the first power difference, taking the second phase difference out of the opposite number to obtain a third phase difference;
and acquiring the preset correction parameters according to the third phase difference and a preset formula.
10. An electronic device, comprising: memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to any one of claims 1-8 when the computer program is executed.
11. A computer readable storage medium having instructions stored thereon which, when run on a computer, cause the computer to perform the method of any of claims 1-8.
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