CN112913149A - Apparatus and method for eliminating frequency interference - Google Patents

Apparatus and method for eliminating frequency interference Download PDF

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Publication number
CN112913149A
CN112913149A CN201880097210.3A CN201880097210A CN112913149A CN 112913149 A CN112913149 A CN 112913149A CN 201880097210 A CN201880097210 A CN 201880097210A CN 112913149 A CN112913149 A CN 112913149A
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signal
frequency
interference
amplitude
interference frequency
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杨鑫
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
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Abstract

The application discloses a device and a method for eliminating frequency interference. The device includes: the processor is used for detecting a target signal output by the system at the current clock so as to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal; a signal generator for generating an initial signal based on the interference frequency; and the signal modulator is used for modulating the initial signal according to the amplitude and/or phase information of the signal of the interference frequency based on a modulation model, and outputting the obtained modulation signal to the system so as to eliminate the signal of the interference frequency carried in the signal output by the next clock, wherein the modulation model is used for calculating the adjustment quantity of the amplitude and/or phase of the initial signal. The method and the device can reduce frequency interference in the system.

Description

Apparatus and method for eliminating frequency interference Technical Field
The present embodiments relate to the field of communications, and in particular, to an apparatus and method for eliminating frequency interference.
Background
In systems such as Global System for Mobile communications (GSM) System, Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE), etc., since frequency interference may exist between frequencies used by adjacent channels, which may affect the signal performance of the System, how to reduce the frequency interference between adjacent or nearby channels becomes an urgent problem to be solved.
Disclosure of Invention
The embodiment of the application provides a device and a method for eliminating frequency interference, which can reduce the frequency interference in a system.
In a first aspect, an apparatus for eliminating frequency interference is provided, including:
the processor is used for detecting a target signal output by the system at the current clock so as to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal;
a signal generator for generating an initial signal based on the interference frequency;
and the signal modulator is used for modulating the initial signal according to the amplitude and/or phase information of the signal of the interference frequency based on a modulation model, and outputting the obtained modulation signal to the system so as to eliminate the signal of the interference frequency carried in the signal output by the next clock, wherein the modulation model is used for calculating the adjustment quantity of the amplitude and/or phase of the initial signal.
Therefore, the method of the embodiment of the application can flexibly eliminate the signals on the interference frequency regardless of the change of the number and the frequency of the interference sources.
In one possible implementation, the processor is specifically configured to: performing Discrete Fourier Transform (DFT) on the target signal; and determining the interference frequency and the amplitude and/or phase information of the signal of the interference frequency according to the DFT result.
In one possible implementation, the processor is specifically configured to: determining a sampling point corresponding to the interference frequency according to the DFT result; according to Nadj＝f s/f adjDetermining the interference frequency, wherein， N adjFor the sampling points corresponding to the interference frequencies, fsIs the sampling frequency of the DFT, fadjIs the interference frequency.
In one possible implementation, the processor is further configured to: and determining the number of the interference frequencies according to the bandwidth of the system and the frequency interval of adjacent channels in the system.
In one possible implementation, the modulation model comprises a least mean square LMS algorithm.
In one possible implementation, the signal modulator is specifically configured to: determining whether the amplitude of the signal of the interference frequency exceeds a threshold; and if the amplitude of the signal of the interference frequency exceeds the threshold, modulating the initial signal according to the signal amplitude and/or the phase information of the interference frequency based on the modulation model to obtain the modulation signal.
In one possible implementation, the signal modulator is further configured to: and if the amplitude of the signal of the interference frequency does not exceed the preset threshold, keeping the modulation signal the same as the modulation signal of the previous clock input system.
In one possible implementation, the initial signal and the modulated signal are sinusoidal signals.
In one possible implementation, the signal generator is a DDS module.
In one possible implementation, the DDS module includes an NCO.
In one possible implementation, the system comprises a digital phase-locked loop, the means for reducing the signal of the interfering frequency carried in the input signal of the DCO in the digital phase-locked loop.
In a second aspect, a method for eliminating frequency interference is provided, the method comprising: detecting a target signal output by a system at a current clock to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal; generating an initial signal based on the interference frequency; and modulating the initial signal according to amplitude and/or phase information of the signal of the interference frequency based on a modulation model, and outputting the obtained modulation signal to the system so as to eliminate the signal of the interference frequency carried in the signal output by the next clock, wherein the modulation model is used for calculating an adjustment quantity of the amplitude and/or the phase of the initial signal.
In a possible implementation manner, the detecting a target signal output by the system to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal includes: performing Discrete Fourier Transform (DFT) on the target signal; and determining the interference frequency and the amplitude and/or phase information of the signal of the interference frequency according to the DFT result.
In one possible implementation, the determining the interference frequency according to the result of the DFT includes: determining a sampling point corresponding to the interference frequency according to the DFT result; according to Nadj＝f s/f adjDetermining the interference frequency, wherein NadjFor the sampling points corresponding to the interference frequencies, fsIs the sampling frequency of the DFT, fadjIs the interference frequency.
In one possible implementation, before the detecting the target signal output by the system, the method further includes: and determining the number of the interference frequencies according to the bandwidth of the system and the frequency interval of adjacent channels in the system.
In one possible implementation, the modulation model comprises a least mean square LMS algorithm.
In a possible implementation manner, the modulating the initial signal according to amplitude and/or phase information of the signal of the interference frequency based on the modulation model to obtain a modulated signal includes: determining whether the amplitude of the signal of the interference frequency exceeds a threshold; and if the amplitude of the signal of the interference frequency exceeds the threshold, modulating the initial signal according to the signal amplitude and/or the phase information of the interference frequency based on the modulation model to obtain the modulation signal.
In one possible implementation, the method further includes: and if the amplitude of the signal of the interference frequency does not exceed the preset threshold, keeping the modulation signal the same as the modulation signal of the previous clock input system.
In one possible implementation, the initial signal and the modulated signal are sinusoidal signals.
In one possible implementation, the system comprises a digital phase-locked loop, and the method is used for reducing the signal of the interference frequency carried in the input signal of the DCO in the digital phase-locked loop.
In a third aspect, an apparatus for canceling frequency interference is provided and includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method of the second aspect or any possible implementation manner of the second aspect.
Based on the above technical solution, the apparatus for eliminating frequency interference can detect a signal of an interference frequency carried in a target signal output by the system in real time, generate an initial signal based on the interference frequency, and modulate the initial signal according to an amplitude and/or a phase of the signal at the interference frequency based on a predetermined modulation model, so as to cancel the signal of the interference frequency carried in the target signal output by the system subsequently through the modulation signal.
Drawings
Fig. 1 is a schematic flow chart of a method for eliminating frequency interference according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a DFT spectrum of an embodiment of the application.
Fig. 3 is a schematic structural diagram of an apparatus for canceling frequency interference according to an embodiment of the present application.
Fig. 4 is a schematic diagram of the apparatus of the embodiment of the present application applied in a digital phase-locked loop and having only one interference frequency.
Fig. 5 is a schematic diagram of an apparatus according to an embodiment of the present application, which is applied in a digital phase-locked loop and has a plurality of interference frequencies.
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.
The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD) System, a Long Term Evolution (Advanced) Evolution (LTE-A) System, a New Radio (New Radio, NR) System, an Evolution System of an NR System, a non-licensed spectrum (LTE-based) System, a non-licensed spectrum (LTE-based General communication) System, a non-licensed spectrum (NR) System, a non-licensed spectrum (Mobile-NR) System, UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, Wireless Local Area Network (WLAN), Wireless Fidelity (WiFi), bluetooth, next generation communication system, or other communication system.
Generally, conventional Communication systems support a limited number of connections and are easy to implement, however, with the development of Communication technology, mobile Communication systems will support not only conventional Communication, but also, for example, Device-to-Device (D2D) Communication, Machine-to-Machine (M2M) Communication, Machine Type Communication (MTC), and Vehicle-to-Vehicle (V2V) Communication, and the embodiments of the present application can also be applied to these Communication systems.
Since different channels in a communication system use different frequencies, frequency interference may exist between adjacent or nearby channels, thereby affecting the signal transmission performance of the communication system. The current method for reducing inter-channel frequency interference can only eliminate interference between channels with fixed intervals, and cannot be flexibly applied to communication systems with different channel intervals.
Therefore, the embodiment of the present application provides a method for eliminating frequency interference, which may detect a signal of an interference frequency carried in a target signal output by a system in real time, and modulate an initial signal generated based on the interference frequency according to an amplitude and/or a phase of a signal at the interference frequency detected by a current clock based on a predetermined modulation model to obtain a modulated signal, so as to input the modulated signal into the system for eliminating the signal of the interference frequency carried in a signal output by a next clock until the signal of the interference frequency reaches an acceptable range.
Fig. 1 is a schematic flow chart of a method for eliminating frequency interference according to an embodiment of the present application. The method can be applied to any system with frequency interference. As shown in fig. 1, the method includes:
in 110, a target signal output by the system at the current clock is detected to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal.
At 120, an initial signal is generated based on the interference frequency.
In 130, the initial signal is modulated according to the amplitude and/or phase information of the signal of the interference frequency based on the modulation model, and the obtained modulated signal is output to the system for eliminating the signal of the interference frequency carried in the signal of the next clock output.
Wherein the modulation model is used to calculate an adjustment to the amplitude and/or phase of the initial signal. The modulation amount required by the next clock to modulate the amplitude and/or phase of the initial signal can be calculated according to the amplitude and/or phase information of the signal of the interference frequency detected in the current clock, so that the amplitude and/or phase of the initial signal can be modulated correspondingly. For example, the modulation amount may be a weight vector, which is multiplied by the initial signal to obtain a modulation signal.
When a target signal having a specific frequency output in the system is affected by signals at other interfering frequencies, a signal at the interfering frequency may be carried in addition to an ideal output signal among the output target signals detected by the current clock. In order to eliminate the signal of the interference frequency, the target signal may be detected in real time, and amplitude and/or phase information of the signal of the interference frequency carried in the target signal may be acquired. And simultaneously generating an initial signal, wherein the frequency of the initial signal is the interference frequency. Based on a modulation model, such as a Least Mean Square (LMS) algorithm, the amplitude and/or phase of the initial signal generated based on the interference frequency may be adjusted according to the amplitude and/or phase information of the signal detected to obtain the interference frequency, so as to obtain a modulated signal. The modulated signal is output to the system and combined with the input signal so that the interfering frequency signal carried in the signal output by the next clock can be cancelled.
Of course, the signal of the interference frequency carried in the signal of the next clock output may not be completely cancelled, and therefore still carries the signal at the interference frequency, but the information such as the amplitude and/or phase of the signal of the interference frequency carried at this time may be changed, for example, reduced in amplitude. Similarly, the signal of the interference frequency carried in the signal of the next clock output is also detected and used to adjust the initial signal to obtain a modulated signal, which is used to cancel the signal of the interference frequency in the signal of the next clock output.
In this way, the amplitude and/or phase of the initial signal are/is continuously adaptively adjusted according to the signal of the interference frequency carried in the target signal output by the previous clock, so that the signal on the interference frequency in the target signal output by the next clock is cancelled, and finally the signal on the interference frequency in the system is smaller and smaller.
It will be appreciated that when there are multiple interfering frequencies, the cancellation can be performed independently on the signal on each interfering frequency. Alternatively, the number of interfering frequencies may be determined based on the system bandwidth and the frequency spacing of adjacent channels in the system. For example, the number of interfering frequencies to be processed is equal to the system bandwidth divided by the frequency spacing of adjacent channels. The frequency spacing of the adjacent channels may typically be agreed upon in advance by a protocol.
For example, assuming that the system bandwidth is 600kHz and the interval between frequencies of adjacent channels agreed in the system is 200kHz, the signals on the first 3 interfering frequencies can be cancelled only, and the interference of the signals on the interfering frequencies outside the system bandwidth to the system is negligible. Assume that the three interference frequencies to be detected are f1, f2, and f3, respectively. It is necessary to generate initial signals with frequencies f1, f2 and f3, respectively, and modulate the amplitude and/or phase of the initial signals with corresponding frequencies according to the amplitude and/or phase of the detected signals with frequencies f1, f2 and f3, respectively, and input the three resulting modulated signals into the system to be combined with the signals output by the system, so as to cancel the signals with frequencies f1, f2 and f 3.
The frequency of the initial signal is the interference frequency. Alternatively, the amplitude and phase of the initial signal may be determined based on the amplitude and phase of the signal at the interference frequency detected in the first clock. The initial signal is modulated in the following clock, but the adjustment amount of each time needs to be determined according to the adjustment model and the detected signal of the interference frequency.
For example, the initial signal is generated based on a current interference frequency, e.g., f 1. If the current interferer disappears, i.e. the interferer frequency f1 disappears, and another interferer, e.g. the interferer frequency f2, appears, then the frequency of the initial signal is f 2. If the current interference frequency f1 still exists and a new interference frequency f2 is suddenly increased, two initial signals need to be generated for the frequencies f1 and f2, respectively. At this time, the two interference frequencies f1 and f2 need to be independently processed by the above-described method. For example, according to the detected interference frequency f1, the initial signal with the frequency f1 is modulated by using a modulation model to obtain a modulation signal with the frequency f1, and according to the detected interference frequency f2, the initial signal with the frequency f2 is modulated by using a modulation model to obtain a modulation signal with the frequency f 2.
Therefore, the method of the embodiment of the application can flexibly eliminate the signals on the interference frequency regardless of the change of the number and the frequency of the interference sources.
Optionally, in 110, detecting a target signal output by the system to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal, includes: performing (DFT) on the target signal; from the result of the DFT, the interference frequency and the amplitude and/or phase information of the signal at the interference frequency are determined.
By performing DFT on a target signal output by the system, a DFT spectrogram can be obtained from which the interference frequency and the amplitude and/or phase information of the signal at the interference frequency can be obtained.
For example, the sampling point corresponding to the interference frequency can be determined according to the result of DFT, and is determined according to Nadj＝f s/f adjThe interference frequency is determined.
Wherein N isadjFor the sampling point corresponding to the interference frequency, fsIs the sampling frequency of the DFT, fadjIs the interference frequency.
Obtaining the sampling point N corresponding to the interference frequency according to the DFT resultadjSampling point NadjThe corresponding frequency is the interference frequency. Sampling point N can be obtained from DFT frequency spectrumadjThe amplitude and/or phase information of the corresponding signal is the amplitude and/or phase information of the signal at the interference frequency.
Taking the DFT spectrum shown in fig. 2 as an example, the abscissa is a sampling point, and the ordinate represents the signal amplitude such as power. Performing DFT on a target signal output by a current clock to obtain a DFT spectrogram as shown in fig. 2, where N is required to be subjected to DFT according to the DFT shown in fig. 2adj、2N adjAnd 3NadjThe signals at the first three samples are cancelled. The spectrogram is an amplitude map reflecting three sampling points Nadj、2N adjAnd 3NadjSignals at corresponding interference frequencies f1, f2, and f3Amplitude information of (2). Similarly, a phase diagram reflecting the phases of the signals at the interference frequencies f1, f2, and f3 can also be obtained after DFT of the target signal, which is not shown in fig. 2. At this time, according to the amplitude and phase information of the signals at the interference frequencies f1, f2 and f3, the initial signals at the frequencies f1, f2 and f3 can be modulated respectively based on the modulation model, so as to obtain three modulation signals at the frequencies f1, f2 and f3, and the three modulation signals are input into the system and combined with the target signal to be output by the system at the next clock, so as to cancel the signals at the three frequencies.
Optionally, in 120, modulating the initial signal according to the amplitude and/or phase information of the signal of the interference frequency based on a modulation model to obtain a modulated signal, including: determining whether the amplitude of the signal of the interference frequency exceeds a threshold; if the amplitude of the signal of the interference frequency exceeds the threshold, modulating the initial signal according to the signal amplitude and/or phase information of the interference frequency based on the modulation model to obtain the modulation signal.
Or, if the amplitude of the signal of the interference frequency does not exceed the preset threshold, the modulation signal remains the same as the modulation signal of the previous clock input system.
That is, if the amplitude of the signal of the interference frequency detected at the current clock is less than or equal to the preset threshold, it can be considered that the interference of the signal of the interference frequency with the target signal has been controlled within an acceptable range. Therefore, the amplitude and the phase of the modulation signal generated by the current clock can be kept the same as those of the modulation signal input into the system at the previous clock by showing that the modulation signal input into the system at the previous clock can control the signal of the interference frequency carried in the target signal in a proper range.
And if the amplitude of the signal of the interference frequency detected at the current clock is greater than or equal to a preset threshold value, continuously modulating the initial signal again based on the modulation model according to the detected signal amplitude and/or phase information of the interference frequency.
The threshold value may be, for exampleAs indicated by the dashed line in fig. 2. The threshold values corresponding to the sampling point intervals where different interference frequencies are located may be different, where the threshold value corresponding to the interference frequency closer to the frequency of the target signal is larger, and the threshold value corresponding to the interference frequency farther away from the frequency of the target signal is smaller. With NadjThis sample point is taken as an example, if NadjIf the corresponding signal amplitude is below the dashed line, the modulation degree of the initial signal is the same as that of the previous clock, which can be understood as that the modulation signal output by the previous clock is used without further adjustment; if N is presentadjThe corresponding signal amplitude is above the dashed line, the original signal is readjusted based on the modulation model.
Alternatively, the initial signal and the modulated signal may be sinusoidal signals, for example. However, the present application is not limited thereto, and the initial signal and the modulated signal may also be other types of signals, or signals formed by superimposing a plurality of signals, such as Gaussian Frequency Shift Keying (GFSK), Quadrature Phase Shift Keying (QPSK), and other modulated signals.
The modulation signal generated in each clock is modulated based on a predetermined modulation model, which may be, for example, an LMS algorithm. However, the present application is not limited thereto, and the modulation model may be any other adaptive modulation model, such as Recursive Least Squares (RLS).
Taking the modulation model as an example of the LMS algorithm, after obtaining the amplitude and phase information of the signal of the interference frequency, the initial signal generated in each clock may be modulated according to the following formula.
Figure PCTCN2018111975-APPB-000001
Where x (n) is an input vector, e.g., an initial signal; w (n) is a weight vector, which can be used to modulate the amplitude and/or phase of x (n); y (n) is the actual output signal, for example, the modulation signal, i.e. the signal of the interference frequency that can be practically cancelled in the next clock; d (n) is the desired output signal, i.e. the signal of the desired interference frequency to cancel, which may be the original signal, for example; e (n) is a deviation, which may be, for example, a signal on a detected interfering frequency; mu is a convergence factor used for controlling convergence speed and stability.
Based on the LMS algorithm, the initial signal is adjusted recursively, so that the modulation signal input to the system can be closer to the signal at the interference frequency each time, and the signal at the interference frequency can be cancelled as much as possible.
Optionally, the system includes a Digital Phase-Locked Loop (DPLL) for reducing the interference frequency signal carried in an input signal of a DCO (Digital-Controlled Oscillator) in the DPLL
Having described the method for canceling frequency interference according to the embodiment of the present application in detail, the apparatus for canceling frequency interference according to the embodiment of the present application will be described below with reference to fig. 3 to 5, and the technical features described in the embodiment of the method are applicable to the following embodiments of the apparatus.
Fig. 3 is a schematic block diagram of an apparatus for canceling frequency interference according to an embodiment of the present application. As shown in fig. 3, the apparatus 300 includes a processor 310, a signal generator 320, and a signal modulator 330. Wherein:
and a processor 310, configured to detect a target signal output by the system at the current clock, so as to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal.
A signal generator 320 for generating an initial signal based on the interference frequency.
A signal modulator 330, configured to modulate the initial signal according to amplitude and/or phase information of the signal of the interference frequency based on a modulation model and output the modulated signal to the system, so as to eliminate the signal of the interference frequency carried in the signal of the next clock output, where the modulation model is used to calculate an adjustment amount for the amplitude and/or phase of the initial signal.
In this embodiment, the processor 310 may detect the signal of the interference frequency carried in the target signal output by the system in real time. The signal modulator 330 modulates the initial signal generated by the signal generator 320 based on the interference frequency according to the amplitude and/or phase information of the signal at the interference frequency detected by the current clock based on a predetermined modulation model, and inputs the modulated signal into the system for eliminating the signal at the interference frequency carried in the signal output by the next clock.
The device can continuously self-adaptively adjust the amplitude and/or the phase of the initial signal according to the signal of the interference frequency carried in the target signal output by the previous clock, thereby offsetting the signal on the interference frequency in the target signal output by the next clock and finally enabling the signal on the interference frequency in the system to be smaller and smaller.
The frequency of the initial signal is the interference frequency. The amplitude and phase of the initial signal may be determined based on the amplitude and phase of the signal at the interference frequency detected in the first clock. The initial signal is modulated in the following clock, but the adjustment amount of each time needs to be determined according to the adjustment model and the detected signal of the interference frequency.
For example, the initial signal is generated based on a current interference frequency, e.g., f 1. If the current interferer disappears, i.e. the interferer frequency f1 disappears, and another interferer, e.g. the interferer frequency f2, appears, then the frequency of the initial signal is f 2. If the current interference frequency f1 still exists and a new interference frequency f2 is suddenly increased, two initial signals need to be generated for the frequencies f1 and f2, respectively. At this time, the two interference frequencies f1 and f2 need to be independently processed by the above-described method. For example, according to the detected interference frequency f1, the initial signal with the frequency f1 is modulated by using a modulation model to obtain a modulation signal with the frequency f1, and according to the detected interference frequency f2, the initial signal with the frequency f2 is modulated by using a modulation model to obtain a modulation signal with the frequency f 2.
Therefore, the device of the embodiment of the application can flexibly eliminate the signals on the interference frequency regardless of the change of the number and the frequency of the interference sources.
Optionally, the processor 310 is specifically configured to: performing Discrete Fourier Transform (DFT) on the target signal; from the result of the DFT, the interference frequency and the amplitude and/or phase information of the signal of the interference frequency are determined.
The processor 310 may be a DFT module, and by performing DFT on a target signal output by the system, a DFT spectrogram may be obtained, from which amplitude and/or phase information of the signal at the interference frequency may be obtained.
When the processor 310 determines the interference frequency, for example, the sampling point corresponding to the interference frequency may be determined according to the DFT result, and the sampling point is determined according to Nadj＝f s/f adjThe interference frequency is determined. Wherein N isadjFor the sampling point corresponding to the interference frequency, fsIs the sampling frequency of the DFT, fadjIs the interference frequency.
Optionally, the processor 310 is further configured to: the number of interfering frequencies is determined based on the bandwidth of the system and the frequency spacing of adjacent channels in the system.
For example, the number of interfering frequencies to be processed is equal to the system bandwidth divided by the frequency spacing of adjacent channels. The frequency spacing of adjacent channels may typically be agreed upon in advance by a protocol.
For example, assuming that the system bandwidth is 600kHz and the spacing between frequencies of adjacent channels agreed in the system is 200kHz, the cancellation can be performed only on the first 3 interfering frequencies. If the sampling point N is determinedadjThen N may be substitutedadj、2N adjAnd 3NadjThe frequencies corresponding to the first three sampling points are taken as interference frequencies. For example, as shown in fig. 2, the processor 310 determines N from the DFT spectrogram after performing DFT on the target signal output by the systemadj、2N adjAnd 3NadjAmplitude and phase information of the signal. N is a radical ofadj、2N adjAnd 3NadjThe corresponding frequencies are denoted f1, f2, and f3, respectively. At this time, the device 300 may beTo include three signal generators 320 and three signal modulators 330. The three signal generators 320 generate three initial signals having frequencies f1, f2, and f3, respectively. The three signal modulators 330 are based on a modulation model, such as the LMS algorithm, according to the frequency N respectivelyadj、2N adjAnd 3NadjAnd modulating the initial signals with frequencies f1, f2 and f3 according to the amplitude and phase information of the corresponding signals to obtain three modulation signals. The three modulated signals are input into the system and combined with a target signal to be output by the system at the next clock, so that the signals at the three frequencies are cancelled.
Optionally, the modulation model comprises an LMS algorithm. For example, the initial signal generated in each clock may be modulated according to the following formula.
Figure PCTCN2018111975-APPB-000002
Where x (n) is an input vector, e.g., an initial signal; w (n) is a weight vector, which can be used to modulate the amplitude and/or phase of x (n); y (n) is the actual output signal, for example, the modulation signal, i.e. the signal of the interference frequency that can be practically cancelled in the next clock; d (n) is the desired output signal, i.e. the signal of the desired interference frequency to cancel, which may be the original signal, for example; e (n) is a deviation, which may be, for example, a signal on a detected interfering frequency; mu is a convergence factor used for controlling convergence speed and stability.
Optionally, the signal modulator 330 is specifically configured to: determining whether the amplitude of the signal of the interference frequency exceeds a threshold; if the amplitude of the signal of the interference frequency exceeds the threshold, modulating the initial signal according to the signal amplitude and/or phase information of the interference frequency based on the modulation model to obtain the modulation signal.
Optionally, the signal modulator 330 is further configured to: and if the amplitude of the signal of the interference frequency does not exceed the preset threshold, keeping the modulation signal the same as the modulation signal input into the system by the previous clock.
If the amplitude of the signal of the interference frequency detected at the current clock is less than or equal to the preset threshold, the interference of the signal of the interference frequency on the target signal can be considered to be controlled within an acceptable range. Therefore, the amplitude and the phase of the modulation signal generated by the current clock can be kept the same as those of the modulation signal input into the system at the previous clock by showing that the modulation signal input into the system at the previous clock can control the signal of the interference frequency carried in the target signal in a proper range.
And if the amplitude of the signal of the interference frequency detected at the current clock is greater than or equal to a preset threshold value, continuously modulating the initial signal again based on the modulation model according to the detected signal amplitude and/or phase information of the interference frequency.
The dashed line shown in fig. 2 represents the threshold. The threshold values corresponding to the sampling point intervals where different interference frequencies are located may be different, where the threshold value corresponding to the interference frequency closer to the frequency of the target signal is larger, and the threshold value corresponding to the interference frequency farther away from the frequency of the target signal is smaller. With NadjThis sample point is taken as an example, if NadjIf the corresponding signal amplitude is below the dashed line, the modulation degree of the initial signal is the same as that of the previous clock, which can be understood as that the modulation signal output by the previous clock is used without further adjustment; if N is presentadjThe corresponding signal amplitude is above the dashed line, the original signal is readjusted based on the modulation model.
Optionally, the initial signal and the modulated signal are sinusoidal signals. But not limited thereto, the initial signal and the modulated signal may also be other types of signals, or signals formed by superimposing a plurality of signals, such as Gaussian Frequency Shift Keying (GFSK) and Quadrature Phase Shift Keying (QPSK) modulation signals.
Optionally, the signal generator 320 is a Direct Digital Synthesizer (DDS) module.
Optionally, the DDS module includes a digital oscillation controller (NCO).
For example, the NCO may generate a sine and cosine signal by using a hook Up Table (LUP), a coordinate Rotation Digital Computer (CORDIC), and the like.
Optionally, the system comprises a digital phase locked loop, the means for reducing the signal of the interfering frequency carried in the input signal of the DCO in the digital phase locked loop.
The method for eliminating frequency interference in the embodiment of the application can be applied to any system with frequency interference. In the following, referring to fig. 4 and fig. 5, only a Digital Phase-Locked Loop (DPLL) is taken as an example for explanation, but the present application is not limited thereto.
As shown in fig. 4, the Digital phase locked loop includes a Time To Digital Converter (TDC) and a DCO, and a Low-Pass Filter (LPF) is disposed between the TDC and the DCO, and one end of the LPF is connected to an output end of the TDC and the other end is connected to an input end of the DCO. A Multi-Modulus Divider (MMD) is connected between the input of the DCO and one input of the TDC. In order to prevent the signal to be input into the DCO from being affected by the interference frequency and obtain a stable and clean DCO control signal, the device for eliminating the frequency interference in the embodiment of the present application may be disposed between the TDC and the LPF.
The DFT module is connected to an input end of the TDC and used for detecting a target signal output by the system at a current clock so as to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal. The DDS may generate an initial signal, such as a sinusoidal signal, an output of the DDS is connected to an input of a signal modulator, an output of the signal modulator is connected to an output of the TDC, and the signal modulator may modulate the initial signal to obtain a modulated signal. The modulated signal is input to the system for canceling the interfering frequency signal carried in the next clock output signal. An LMS module may be further disposed between the DFT module and the signal modulator, where the LMS module performs LMS calculation after receiving the amplitude and phase information of the detected signal of the interference frequency sent by the DFT module, to determine an amplitude and phase modulation amount of the initial signal, and transmits the calculated modulation amount to the signal modulator, so that the signal modulator performs corresponding adjustment on the initial signal. Alternatively, the LMS module may be integrated in the signal modulator as part of the signal modulator, e.g. as a processing unit of the dry signal modulator; or as a separate processing unit; or the LMS module may be integrated with the DFT module; this is not limited in this application.
Fig. 4 shows the case where only one interference source is present, i.e. the channel carrying the target signal is affected by only one adjacent channel, which may have an interference frequency of, for example, N as shown in fig. 2adjCorresponding interference frequency f 1.
When there are multiple sources of interference, such as sample point N shown in FIG. 2adj、2N adjAnd 3NadjCorresponding to the interference frequencies f1, f2 and f3, as shown in fig. 5, three DDS are required to be set, and three initial signals are generated based on the interference frequencies f1, f2 and f3, respectively. The output end of each DDS is connected with a signal modulator, and the three signal modulators respectively modulate initial signals with frequencies of f1, f2 and f3, so that three modulation signals with frequencies of f1, f2 and f3 are obtained. The three modulation signals are coupled to the output end of the TDC, so that the three interference frequency signals carried in the signal input into the LPF are all cancelled, and then the signal reaches the DCO after being filtered by the LPF, so that the interference in the input signal of the DCO is eliminated to a certain extent.
It should be understood that the apparatus 300 for canceling frequency interference may perform the corresponding method in the method 100, and various embodiments described in the method 100 may be applied to the apparatus 300, which is not described herein again for brevity.
The embodiment of the present application further provides an apparatus for eliminating frequency interference, which includes a memory and a processor, where the processor may call and run a computer program from the memory to implement the method in the embodiment of the present application.
It should be noted that, without conflict, the embodiments and/or technical features in the embodiments described in the present application may be arbitrarily combined with each other, and the technical solutions obtained after the combination also fall within the protection scope of the present application.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should also be understood that in the present embodiment, "B corresponding to (corresponding to) a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the unit is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The device and the equipment mentioned in the present application can be a chip system, and can also be a device or equipment with a shell.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
This functionality, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the 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 conceive of the changes or substitutions within the technical scope of the present application, and shall 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.

Claims (21)

  1. An apparatus for canceling frequency interference, comprising:
    the processor is used for detecting a target signal output by the system at the current clock so as to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal;
    a signal generator for generating an initial signal based on the interference frequency;
    and the signal modulator is used for modulating the initial signal according to the amplitude and/or phase information of the signal of the interference frequency based on a modulation model, and outputting the obtained modulation signal to the system so as to eliminate the signal of the interference frequency carried in the signal output by the next clock, wherein the modulation model is used for calculating the adjustment quantity of the amplitude and/or phase of the initial signal.
  2. The apparatus of claim 1, wherein the processor is specifically configured to:
    performing Discrete Fourier Transform (DFT) on the target signal;
    and determining the interference frequency and the amplitude and/or phase information of the signal of the interference frequency according to the DFT result.
  3. The apparatus of claim 2, wherein the processor is specifically configured to:
    determining a sampling point corresponding to the interference frequency according to the DFT result;
    according to Nadj＝f s/f adjDetermining the interference frequency, wherein NadjFor the sampling points corresponding to the interference frequencies, fsIs the sampling frequency of the DFT, fadjIs the interference frequency.
  4. The apparatus of any of claims 1-3, wherein the processor is further configured to:
    and determining the number of the interference frequencies according to the bandwidth of the system and the frequency interval of adjacent channels in the system.
  5. The apparatus according to any of claims 1 to 4, wherein the modulation model comprises a Least Mean Squares (LMS) algorithm.
  6. The apparatus according to any of claims 1 to 5, wherein the signal modulator is specifically configured to:
    determining whether the amplitude of the signal of the interference frequency exceeds a threshold;
    and if the amplitude of the signal of the interference frequency exceeds the threshold, modulating the initial signal according to the signal amplitude and/or the phase information of the interference frequency based on the modulation model to obtain the modulation signal.
  7. The apparatus of claim 6, wherein the signal modulator is further configured to:
    and if the amplitude of the signal of the interference frequency does not exceed the preset threshold, keeping the modulation signal the same as the modulation signal of the previous clock input system.
  8. The apparatus of any one of claims 1 to 7, wherein the initial signal and the modulated signal are sinusoidal signals.
  9. The apparatus of any one of claims 1 to 8, wherein the signal generator is a direct digital frequency synthesizer (DDS) module.
  10. The apparatus of claim 9, wherein the DDS module comprises a digital oscillation controller (NCO).
  11. An arrangement according to any of claims 1-10, characterized in that the system comprises a digital phase locked loop, and the arrangement is adapted to reduce the signal of the disturbing frequency carried in the input signal of a digitally controlled oscillator, DCO, in the digital phase locked loop.
  12. A method for canceling frequency interference, the method comprising:
    detecting a target signal output by a system at a current clock to obtain amplitude and/or phase information of a signal of an interference frequency carried in the target signal;
    generating an initial signal based on the interference frequency;
    and modulating the initial signal according to amplitude and/or phase information of the signal of the interference frequency based on a modulation model, and outputting the obtained modulation signal to the system so as to eliminate the signal of the interference frequency carried in the signal output by the next clock, wherein the modulation model is used for calculating an adjustment quantity of the amplitude and/or the phase of the initial signal.
  13. The method of claim 12, wherein the detecting the target signal output by the system to obtain the amplitude and/or phase information of the signal of the interference frequency carried in the target signal comprises:
    performing Discrete Fourier Transform (DFT) on the target signal;
    and determining the interference frequency and the amplitude and/or phase information of the signal of the interference frequency according to the DFT result.
  14. The method of claim 13, wherein the determining the interfering frequency according to the result of the DFT comprises:
    determining a sampling point corresponding to the interference frequency according to the DFT result;
    according to Nadj＝f s/f adjDetermining the interference frequency, wherein NadjFor the sampling points corresponding to the interference frequencies, fsIs the sampling frequency of the DFT, fadjIs the interference frequency.
  15. The method of any one of claims 12 to 14, wherein prior to detecting a target signal output by the system, the method further comprises:
    and determining the number of the interference frequencies according to the bandwidth of the system and the frequency interval of adjacent channels in the system.
  16. The method according to any of claims 12 to 15, wherein said modulation model comprises a least mean square LMS algorithm.
  17. The method according to any one of claims 12 to 16, wherein the modulating the initial signal according to amplitude and/or phase information of the signal of the interference frequency based on the modulation model to obtain a modulated signal comprises:
    determining whether the amplitude of the signal of the interference frequency exceeds a threshold;
    and if the amplitude of the signal of the interference frequency exceeds the threshold, modulating the initial signal according to the signal amplitude and/or the phase information of the interference frequency based on the modulation model to obtain the modulation signal.
  18. The method of claim 17, further comprising:
    and if the amplitude of the signal of the interference frequency does not exceed the preset threshold, keeping the modulation signal the same as the modulation signal of the previous clock input system.
  19. The method according to any of claims 12 to 18, characterized in that the initial signal and the modulated signal are sinusoidal signals.
  20. A method according to any one of claims 12 to 19, characterized in that the system comprises a digital phase locked loop, the method being arranged to reduce the signal of the interfering frequency carried in the input signal of a digitally controlled oscillator DCO in the digital phase locked loop.
  21. An apparatus for canceling frequency interference, the apparatus comprising a memory for storing a computer program and a processor for calling and executing the computer program stored in the memory to perform the method of any one of claims 12 to 20.
CN201880097210.3A 2018-10-25 2018-10-25 Apparatus and method for eliminating frequency interference Pending CN112913149A (en)

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