CN101860382B - Narrow-band interference suppression method and device - Google Patents
Narrow-band interference suppression method and device Download PDFInfo
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Abstract
The invention discloses a narrow-band interference suppression method and a narrow-band interference suppression device. The narrow-band interference suppression device comprises a frequency determining unit, a self-adaptive filtering unit, and an interference eliminating unit, wherein the frequency determining unit determines the frequency position of the narrow-band interference in a receiving signal, forms a local oscillator signal which only comprises narrow-band interference frequency information, and provides the local oscillator signal serving as a reference noise source for the self-adaptive filtering unit; the self-adaptive filtering unit converts the reference noise source into an analog interference signal which is consistent with the narrow-band interference, and provides the analog interference signal which is consistent with the narrow-band interference for the interference eliminating unit; and the interference eliminating unit eliminates the analog interference signal which is consistent with the narrow-band interference from the receiving signal, and outputs a useful signal. The narrow-band interference suppression method and the narrow-band interference suppression device perform point-to-point sampling processing on the data, and have high response speed. During eliminating the narrow-band interference, the damage to the useful signal at the same frequency position is reduced.
Description
Technical field
The present invention relates to digital signal processing technique field, more specifically, the present invention relates to a kind of narrow-band interference rejection method and device.
Background technology
In digital information processing system, the data-signal that is processed can be because a variety of causes be sneaked into the additivity interference signal, and said additivity interference signal is accumulated on the useful signal, influences the transmission and the processing of useful signal.Common additivity interference signal comprises: white noise, impulsive noise, narrow band interference etc.
A kind of as the additivity interference signal, narrow-band interference signal is meant the interference signal of bandwidth much smaller than useful signal.Said narrow-band interference signal has serious harm for the message transmission and the information processing of digital information processing system.For example, in communication control processor, strong narrow band interference can cause the signal-noise ratio threshold of receiver to reduce, and is difficult to locking synchronously, and equalizer is difficult to convergence, even takes defeat; In digital television system, undressed narrow band interference can influence the transmission of useful data, causes that digital TV terminal display quality occurs and descends.
For digital television system, the main source of narrow band interference comprises: (1) simple signal, and said simple signal can be revealed from the local oscillator in transmitter or the receiver, oscillator signal that crystal oscillator produces on the printed circuit board (PCB) and harmonic wave thereof etc.; (2) the FM radio set ripple also can produce strong narrow band interference like FM broadcasting, intercom etc.; (3) image carrier signal of anolog TV signals and sound carrier signal.
The method that prior art suppresses narrow band interference can be divided into two types usually:
A kind of method be utilize fast Fourier transform (FFT) with signal by spatial transform to frequency domain, the method through power detection finds the corresponding frequency of narrow band interference, and through this frequency is carried out zero setting or filtering operation, reaches the purpose of eliminating narrow band interference.Like number of patent application is that 200710071414.3 one Chinese patent application file is said, at first input signal is carried out fast Fourier transform, detect the narrow band interference position after, should locational subcarrier in frequency domain zero setting.
Another kind method is at first to confirm the frequency that narrow band interference is corresponding, and the mode of using shift frequency, filtering then is with its filtering.Like number of patent application is that 200610028350.4 one Chinese patent application file is said; At first convert the signal into frequency domain; Detect whether narrow band interference exists and confirm its frequency domain position, afterwards, the frequency domain position of said narrow band interference is moved the zero frequency place through the frequency spectrum shift device; Then, with high pass filter filtering narrow-band interference signal; The last signal that will eliminate narrow band interference is again moved go back to the original signal spectrum position.
Yet there are many shortcomings in the narrow-band interference rejection method of prior art:
1. the fast Fourier transform of prior art employing belongs to the data block processing, and its response speed is limited, is difficult to the variation of real-time tracking narrow band interference;
2. when the signal of narrow band interference frequency being carried out zero setting or Filtering Processing, the useful signal of same frequency position is significantly suppressed;
3. the narrow-band interference signal frequency can only be followed the tracks of, and the variation of its phase place and amplitude can't be followed the tracks of.
Summary of the invention
The problem that the present invention solves provides a kind of narrow-band interference rejection method and device; Both can follow the tracks of the frequency change of interference signal; Can also follow the tracks of the amplitude and the phase change of interference signal; Accomplish Suppression of narrow band interference simultaneously, reduce to the influence of the useful signal of narrow band interference same frequency, thereby improved the signal to noise ratio of handling the back signal.
For addressing the above problem, the invention provides a kind of narrow-band interference rejection method, comprising:
Confirm to receive the frequency location of narrow band interference in the signal, form the reference noise source that comprises the narrow band interference frequency information;
Convert said reference noise source into the simulaed interference signal consistent through adaptive-filtering with narrow band interference;
From receive signal, eliminate the said simulaed interference signal consistent with narrow band interference.
Optional, the method that said adaptive-filtering adopts recurrence to upgrade weight coefficient realizes converting the reference noise source into the simulaed interference signal consistent with narrow band interference.
Optional, said recurrence is upgraded weight coefficient and is comprised:
Weight coefficient and reference noise source is synthetic, form simulaed interference signal;
More said simulaed interference signal and reception signal form the output signal based on said comparative result;
Confirm the weight coefficient renewal amount based on said output signal and reference noise source;
Repeatedly repeat above-mentioned steps, with the weight coefficient renewal amount weight coefficient is carried out recurrence and upgrade, no longer change until the value of said weight coefficient;
Weight coefficient and the reference noise source of this moment is synthetic, form the simulaed interference signal consistent with narrow band interference.
Accordingly, the present invention also provides a kind of Suppression of narrow band interference device, comprising: frequency is confirmed unit, adaptive-filtering unit and interference cancellation unit, wherein,
Frequency confirms that the unit confirm to receive the frequency location of narrow band interference in the signal, forms the local oscillated signal that includes the narrow band interference frequency information, and with said local oscillated signal as a reference noise source offer the adaptive-filtering unit;
The adaptive-filtering unit converts said reference noise source into the simulaed interference signal consistent with narrow band interference, and the said simulaed interference signal consistent with narrow band interference offered interference cancellation unit;
Interference cancellation unit is eliminated the said simulaed interference signal consistent with narrow band interference from receive signal.
Optional, the adaptive-filtering of said adaptive-filtering unit is realized based on least mean square algorithm or recursive least-squares algorithm.
Compared with prior art, the present invention has the following advantages:
1. logarithm is gone the pointwise sampling processing factually, and response speed is fast;
2. adopt adaptive noise to offset the elimination of accomplishing narrow band interference, when said narrow band interference is eliminated, reduced destruction the useful signal of same frequency position;
3. both can follow the tracks of the frequency of narrow-band interference signal, can also follow the tracks of its phase place and changes in amplitude.
Description of drawings
Fig. 1 is the schematic flow sheet of an embodiment of narrow-band interference rejection method of the present invention;
Fig. 2 is the schematic flow sheet of adaptive-filtering among embodiment of narrow-band interference rejection method of the present invention;
Fig. 3 is the module diagram of Suppression of narrow band interference device of the present invention;
Fig. 4 is the module diagram of first embodiment of Suppression of narrow band interference device of the present invention;
Fig. 5 is the module diagram of second embodiment of Suppression of narrow band interference device of the present invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Set forth a lot of details in the following description so that make much of the present invention, implement but the present invention can also adopt other to be different from alternate manner described here, so the present invention has not received the restriction of following disclosed specific embodiment.
Said as the background technology part, the narrow-band interference rejection method of prior art has many shortcomings:
1. the fast Fourier transform of adopting belongs to data block to be handled, and its response speed is limited, is difficult to the variation of real-time tracking narrow band interference;
2. often need carry out zero setting or Filtering Processing to the signal of narrow band interference frequency, the useful signal of same frequency position can be suppressed equally;
3. the narrow-band interference signal frequency can only be followed the tracks of, and the variation of its phase place and amplitude can't be followed the tracks of.
To the problems referred to above, method and device that the inventor provides a kind of narrow band interference of utilizing adaptive-filtering to be mingled with to received signal to suppress.Said adaptive-filtering is based on least mean square algorithm or recursive least-squares algorithm; After weight coefficient being carried out recurrence renewal repeatedly; Obtained confirming constant weight coefficient, can obtain the simulaed interference signal consistent based on said definite weight coefficient, afterwards with receiving narrow-band interference of signal; Said simulaed interference signal is eliminated from receiving signal, can be obtained the useful signal after narrow band interference is suppressed.
Inventor of the present invention finds that it is that a kind of sef-adapting filter that utilizes converts the reference noise source and the corresponding to simulaed interference signal of interference signal to that adaptive noise offsets, and from receive signal, eliminates the noise cancellation method of interference signal again.But in digital communication system, said reference noise source be difficult for to obtain, and therefore, not capable field technique personnel offset said adaptive noise in the elimination that method is applied to the noise suppressed of digital communication system, particularly narrow band interference.
The problem that is difficult for acquisition to said reference noise source; The inventor proposes; Utilize phase-locked loop to confirm the frequency of narrow band interference earlier, form the local oscillated signal that comprises said narrow band interference frequency information, afterwards; With said local oscillated signal noise source as a reference, can adaptive noise be offseted the inhibition method that method is applied to narrow band interference again.Said adaptive noise offsets accomplishes Suppression of narrow band interference simultaneously, reduced to the influence of the useful signal of narrow band interference same frequency, improved the signal to noise ratio of handling the back signal greatly.
Narrow-band interference rejection method and device are described further specific embodiment of the present invention with reference to the accompanying drawings for a better understanding of the present invention.
Fig. 1 is the schematic flow sheet of an embodiment of narrow-band interference rejection method of the present invention.
Of Fig. 1, one embodiment comprises of narrow-band interference rejection method of the present invention:
Execution in step S102, definite frequency location that receives narrow band interference in the signal forms the reference noise source that comprises the narrow band interference frequency information.
The process of narrow band interference frequency comprises in said definite reception signal: local oscillated signal and narrow band interference are compared; Based on said comparative result the frequency of local oscillated signal is upgraded, identical until the frequency of said local oscillated signal with the frequency of narrow band interference; Local oscillated signal noise source as a reference with this moment.
In specific embodiment, produce local oscillated signal through phase-locked loop, and carry out the comparison of said local oscillated signal and narrow band interference, the renewal of local oscillated signal.Owing to include useful signal and narrow band interference in the said reception signal; Because the frequency band range broad of useful signal, thus said phase-locked loop mainly follow the tracks of the narrower narrow band interference of frequency band and with the frequency change of the part useful signal of said narrow band interference same frequency.
Execution in step S104 converts said reference noise source into the simulaed interference signal consistent with narrow band interference through adaptive-filtering.
Said adaptive-filtering is realized through the adaptive-filtering unit; In the processing procedure of said adaptive-filtering; Adaptive-filtering unit by using previous moment has obtained the filter parameter that filter parameter is regulated now automatically, with the variation of adaptation signal and interference, thereby realizes optimal filter.Adaptive-filtering for narrow-band interference rejection method employing of the present invention; Its adaptive-filtering unit need upgrade the weight coefficient renewal amount based on the output signal in its last cycle; And, form the weight coefficient of current period based on the weight coefficient renewal amount of said renewal.Said weight coefficient is the impulse response of adaptive-filtering.
Then, the reference noise source is handled, form simulaed interference signal based on said weight coefficient.Afterwards, said adaptive-filtering unit compares simulaed interference signal with receiving signal, and based on said simulaed interference signal and the comparative result that receives signal, the adaptive-filtering unit forms the output signal.This has just realized renewal process of weight coefficient, simulaed interference signal.
And in actual process, after need upgrading through repeatedly recurrence, said simulaed interference signal can be realized consistent with narrow band interference.
In specific embodiment, can form the said simulaed interference signal consistent through adaptive-filtering based on least mean square algorithm or recursive least-squares algorithm with narrow band interference.
As shown in Figure 2, specifically, the flow process of said adaptive-filtering comprises:
Execution in step S202, weight coefficient and reference noise source is synthetic, form simulaed interference signal.
In the renewal process of said weight coefficient, need upgrade weight coefficient based on a definite weight coefficient initial value, the initial value of said weight coefficient can be confirmed by preset value.The occurrence of said weight coefficient initial value does not influence the end value of weight coefficient, only influences the speed that weight coefficient upgrades.
In specific embodiment, weight coefficient and reference noise source is synthetic, form simulaed interference signal and confirm by expression:
n(n)＝p(n)*conj[W(n)]；
Wherein, n (n) is a simulaed interference signal, and p (n) is the reference noise source, and W (n) is a weight coefficient, and conj [] is for getting conjugation.
Execution in step S204, more said simulaed interference signal and reception signal form the output signal based on said comparative result.
In specific embodiment, more said simulaed interference signal and reception signal form the output signal based on said comparative result and are confirmed by expression:
y(n)＝r(n)-n(n)；
Wherein, y (n) is the output signal, and r (n) is for receiving signal.Promptly from said reception signal, remove simulaed interference signal.Through after the above-mentioned processing, except the difference of simulaed interference signal and narrow band interference, also include useful signal in the said output signal; But because said useful signal and narrow band interference are separate, so the useful signal in the output signal does not influence confirming of weight coefficient renewal amount.
Execution in step S206 confirms the weight coefficient renewal amount based on said output signal and reference noise source.
In specific embodiment, adopt the product in output signal and reference noise source to confirm weight coefficient renewal amount k (n).
For the adaptive-filtering that adopts least mean square algorithm, its weight coefficient renewal amount k (n) is confirmed by following formula:
k(n)＝step*y(n)*conj[p(n)]，
Wherein, y (n) is the output signal, and step is the configuration constant, through revising said configuration constant, can regulate speed and precision that the weight coefficient recurrence is upgraded.
And for the adaptive-filtering that adopts the recursive least-squares algorithm, its weight coefficient renewal amount k (n) is confirmed by following formula:
k(n)＝[1/(delta(n)]*y(n)*conj[p(n)]，
delta(n)＝lamda*delta(n-1)+p(n)*conj[p(n)]；
Wherein, y (n) is the output signal, and delta (n) is a recursion coefficient, and lamda is the configuration constant, and the span of said configuration constant is (0,1).Through revising said configuration constant, can regulate speed and precision that recursion coefficient delta (n) recurrence is upgraded, and then realize adjusting weight coefficient renewal speed and precision.
Execution in step S208 repeatedly repeats above-mentioned steps, with the weight coefficient renewal amount weight coefficient is carried out recurrence and upgrades, and no longer changes until the value of said weight coefficient.
In practical application; Weight coefficient only can't make simulaed interference signal follow the tracks of narrow band interference through once upgrading, and said weight coefficient need upgrade through recurrence repeatedly, after said repeatedly recurrence is upgraded completion; The weight coefficient renewal amount is zero, and weight coefficient no longer changes simultaneously.Do not include the signal relevant with narrow band interference in the weight coefficient renewal amount explanation output signal of said null value, it is independent fully each other promptly to export signal and narrow band interference.
Execution in step S210, weight coefficient and the reference noise source of this moment is synthetic, form the simulaed interference signal consistent with narrow band interference.
In specific embodiment, said weight coefficient and reference noise source synthetic identical with step S202 after being about to said definite constant weight coefficient and getting conjugation, multiplied each other with the reference noise source again, forms the simulaed interference signal consistent with narrow band interference.
As shown in Figure 1, after abovementioned steps S102 to S104 carried out, the reference noise source promptly can be exchanged into the simulaed interference signal consistent with narrow band interference.Afterwards, continue execution in step S106, from receive signal, eliminate the said simulaed interference signal consistent, thereby obtain clean useful signal with narrow band interference.
An embodiment of narrow-band interference rejection method of the present invention is an inhibition method of having only a narrow band interference in the signal to receiving; And under reality; Receive signal and possibly include a plurality of narrow band interference that are in the different frequency position, for example include the digital television signal of FM broadcasting and simulated television sound carrier simultaneously.For the said reception signal that includes a plurality of narrow band interference, repeated execution of steps S102 to S106 repeatedly is until eliminating detected a plurality of narrow band interference.
Fig. 3 is the module diagram of Suppression of narrow band interference device of the present invention.
As shown in Figure 3, Suppression of narrow band interference device of the present invention comprises: frequency is confirmed unit 201, adaptive-filtering unit 203 and interference cancellation unit 205, wherein,
Frequency confirms that unit 201 confirms to receive the frequency locations of narrow band interference in the signals, forms the local oscillated signal that only includes the narrow band interference frequency information, and with said local oscillated signal as a reference noise source offer adaptive-filtering unit 203.
Adaptive-filtering unit 203 converts said reference noise source into the simulaed interference signal consistent with narrow band interference, and the said simulaed interference signal consistent with narrow band interference offered interference cancellation unit 205.
The operation principle of Suppression of narrow band interference device of the present invention is:
The reception signal that will include useful signal and narrow band interference is sent into frequency respectively and is confirmed unit 201 and interference cancellation unit 205; Wherein, Said frequency is confirmed the frequency location of unit 201 definite narrow band interference; Follow the tracks of the frequency change of said narrow band interference, form the local oscillated signal only include the narrow band interference frequency information, and with said local oscillated signal as a reference noise source offer adaptive-filtering unit 203.
Adaptive-filtering unit 203 converts said reference noise source the simulaed interference signal consistent with narrow band interference into and offers interference cancellation unit 205 after receiving said reference noise source; And interference cancellation unit 205 is eliminated the said simulaed interference signal consistent with narrow band interference from receive signal, exports clean useful signal.
In specific embodiment; The adaptive-filtering of said adaptive-filtering unit 203 is based on least mean square algorithm or the realization of recursive least-squares algorithm; The output signal demand of interference cancellation unit 205 feeds back to said adaptive-filtering unit 203, to regulate the weight coefficient renewal amount of adaptive-filtering.After recurrence convergence repeatedly, adaptive-filtering unit 203 obtains the noise signal consistent with narrow band interference, and the clean useful signal of the also stable output of interference cancellation unit 205.
Fig. 4 is the module diagram of first embodiment of Suppression of narrow band interference device of the present invention.Suppression of narrow band interference device first embodiment of the present invention adopts the adaptive-filtering based on least mean square algorithm to suppress narrow band interference.
As shown in Figure 4, first embodiment of Suppression of narrow band interference device of the present invention comprises: frequency is confirmed unit 201, adaptive-filtering unit 203 and interference cancellation unit 205.
In specific embodiment, said frequency confirms that unit 201 is phase-locked loop structures, comprises error extracting device 302, loop filter 304 and digital controlled oscillator 306, wherein,
The local oscillated signal and the errors that receive narrow-band interference of signal of the output of error extracting device 302 comparand controlled oscillators 306, and said error signal offered in the loop filter 304.
304 pairs of said error signals of loop filter are carried out filtering, form control signal, said control signal and error signal positive correlation, and error signal is more little, and the amplitude of control signal is more little.
Digital controlled oscillator 306 receives the control signal that loop filter 304 provides, and different according to the amplitude of said control signal, forms the local oscillated signal of different frequency, and said local oscillated signal is fed back to error extracting device 302.
In practical operation, after feedback repeatedly, the frequency-tracking of the narrow band interference during the local oscillated signal of digital controlled oscillator 302 output achieves a butt joint and collects mail number, said local oscillated signal are promptly as the reference noise source of follow-up adaptive-filtering.
Adaptive-filtering unit 203 carries out adaptive-filtering based on least mean square algorithm, need give said adaptive-filtering unit 203 with the output signal feedback of interference cancellation unit 205, to regulate the weight coefficient renewal amount of adaptive-filtering.Said adaptive-filtering upgrades weight coefficient through recurrence and accomplishes the tracking to narrow band interference.
For the recurrence of accomplishing said weight coefficient is upgraded, adaptive-filtering unit 203 comprises renewal amount setup unit 301, adder unit 303, delay unit 305 and interference synthesis unit 307, wherein,
Renewal amount setup unit 301 receive frequencies are confirmed the output signal of reference noise source that unit 201 provides and interference cancellation unit 205 feedbacks; The product of the conjugate in said reference noise source, configuration constant and output signal as the weight coefficient renewal amount, and is offered adder unit 303 with said weight coefficient renewal amount;
The weight coefficient renewal amount addition of the weight coefficient of the last one-period that adder unit 303 will be delayed time and current period realizes the renewal of weight coefficient, and said weight coefficient is offered delay unit 305;
Behind the weight coefficient time-delay one-period that delay unit 305 provides adder unit 303, offer adder unit 303 respectively and disturb synthesis unit 307;
Disturb synthesis unit 307 that said weight coefficient and reference noise source are synthesized, as simulaed interference signal, and said simulaed interference signal sent into interference cancellation unit 205 with the product in the conjugate of said weight coefficient and reference noise source.
Said interference cancellation unit 205 feeds back to renewal amount setup unit 301 to receive the poor as the output signal of signal and simulaed interference signal.
Through the processing of said adaptive-filtering unit 201, said weight coefficient no longer changes, and explain that promptly the weight coefficient renewal amount is zero, and said weight coefficient renewal amount is by output signal and the reference noise source decision relevant with narrow band interference.Therefore, do not include the signal relevant with narrow band interference in the weight coefficient renewal amount of the said null value explanation output signal, output signal and narrow band interference are independent fully each other.
Fig. 5 is the module diagram of second embodiment of Suppression of narrow band interference device of the present invention.Second embodiment of Suppression of narrow band interference device of the present invention suppresses narrow band interference based on the adaptive-filtering of recursive least-squares algorithm.
As shown in Figure 5, second embodiment of Suppression of narrow band interference device of the present invention comprises: frequency is confirmed unit 201, adaptive-filtering unit 203 and interference cancellation unit 205.
In specific embodiment, said frequency confirms that unit 201 is phase-locked loop structures, comprises error extracting device 302, loop filter 304 and digital controlled oscillator 306, and is identical with the corresponding unit of first embodiment of Suppression of narrow band interference device of the present invention.
Adaptive-filtering unit 203 carries out adaptive-filtering based on the recursive least-squares algorithm, need give said adaptive-filtering unit 203 with the output signal feedback of interference cancellation unit 205, to regulate the weight coefficient renewal amount of adaptive-filtering.Said adaptive-filtering upgrades weight coefficient through recurrence and accomplishes the tracking to narrow band interference i (n).
For the recurrence of accomplishing said weight coefficient is upgraded; Adaptive-filtering unit 203 comprises renewal amount setup unit 501, first adder unit 503, first delay unit 505, disturb synthesis unit 507, second adder unit 509, second delay unit 511, coefficient dispensing unit 513 and recurrence renewal amount unit 515; Wherein
Renewal amount setup unit 501 receive frequencies are confirmed reference noise source that unit 201 provides, recursion coefficient that second delay unit 511 provides and the output signal of interference cancellation unit 205 feedbacks; The product of the reciprocal of the conjugate in said reference noise source, recursion coefficient and output signal as the weight coefficient renewal amount, and is offered first adder unit 503 with said weight coefficient renewal amount;
The weight coefficient renewal amount addition of the weight coefficient of the last one-period that first adder unit 503 will be delayed time and current period realizes the renewal of weight coefficient, and said weight coefficient is offered first delay unit 505;
Behind the weight coefficient time-delay one-period that first delay unit 505 provides first adder unit 503, offer first adder unit 503 respectively and disturb synthesis unit 507;
Disturb synthesis unit 507 that the weight coefficient that first delay unit 505 provides is synthesized with the reference noise source, as simulaed interference signal, and said simulaed interference signal sent into interference cancellation unit 205 with the product in the conjugate of said weight coefficient and reference noise source;
Recurrence renewal amount unit 515 receive frequencies are confirmed the reference noise source that the unit provides, and as the recursion coefficient renewal amount, and said recursion coefficient renewal amount are offered second adder unit 509 with the product in the conjugate in said reference noise source and reference noise source;
Behind the recursion coefficient time-delay one-period that second delay unit 511 provides second adder unit 509, deliver to coefficient dispensing unit 513 and renewal amount setup unit 501 respectively.
Said interference cancellation unit 205 feeds back to renewal amount setup unit 501 to receive the poor as the output signal of signal and simulaed interference signal.
Through the processing of said adaptive-filtering unit 201, said weight coefficient no longer changes, and explain that promptly the weight coefficient renewal amount is zero, and said weight coefficient renewal amount is by output signal and the reference noise source decision relevant with narrow band interference.Therefore, do not include the signal relevant with narrow band interference in the weight coefficient renewal amount of the said null value explanation output signal, output signal and narrow band interference are independent fully each other.
Have only a narrow band interference in the reception signal of Suppression of narrow band interference device of the present invention, and under reality, receive signal and possibly include a plurality of narrow band interference, for example include the digital television signal of FM broadcasting and simulated television sound carrier simultaneously.For the said reception signal that includes a plurality of narrow band interference, can said Suppression of narrow band interference device is connected in series, eliminate detected a plurality of narrow band interference respectively, obtain clean useful signal.
Narrow-band interference rejection method of the present invention and device are when handling narrow band interference, and logarithm is gone the pointwise sampling processing factually, and response speed is fast; Accomplishing Suppression of narrow band interference simultaneously, reduced destruction to the useful signal of same frequency position, improved the signal to noise ratio of handling the back signal.
Should be appreciated that example here and embodiment only are exemplary, those skilled in the art can make various modifications and corrigendum under the situation of the spirit and scope of the present invention that do not deviate from the application and accompanying claims and limited.
Claims (13)
1. a narrow-band interference rejection method is characterized in that, comprising:
Confirm to receive the frequency location of narrow band interference in the signal, form the reference noise source that comprises the narrow band interference frequency information, comprising: local oscillated signal and narrow band interference are compared; Based on said comparative result the frequency of local oscillated signal is upgraded, identical until the frequency of said local oscillated signal with the frequency of narrow band interference; Local oscillated signal noise source as a reference with this moment;
Convert said reference noise source into the simulaed interference signal consistent through adaptive-filtering with narrow band interference; Wherein, The method that said adaptive-filtering adopts recurrence to upgrade weight coefficient realizes converting the reference noise source into the simulaed interference signal consistent with narrow band interference; Comprise: 1) that weight coefficient and reference noise source is synthetic, form simulaed interference signal; 2) more said simulaed interference signal and reception signal form the output signal based on said comparative result; 3) confirm the weight coefficient renewal amount based on said output signal and reference noise source;
Repeatedly repeat above-mentioned steps 1), 2), 3), with the weight coefficient renewal amount weight coefficient is carried out recurrence and upgrades, no longer change until the value of said weight coefficient; Weight coefficient and the reference noise source of this moment is synthetic, form the simulaed interference signal consistent with narrow band interference;
From receive signal, eliminate the said simulaed interference signal consistent with narrow band interference.
2. narrow-band interference rejection method as claimed in claim 1 is characterized in that, weight coefficient and reference noise source is synthetic, forms simulaed interference signal and is confirmed by expression:
n(n)=p(n)*conj[W(n)]；
Wherein, n (n) is a simulaed interference signal, and p (n) is the reference noise source, and W (n) is a weight coefficient, and conj [] is for getting conjugation.
3. narrow-band interference rejection method as claimed in claim 2 is characterized in that, more said simulaed interference signal and reception signal form the output signal based on said comparative result and confirmed by expression:
y(n)=r(n)-n(n)；
Wherein, y (n) is the output signal, and r (n) is for receiving signal.
4. narrow-band interference rejection method as claimed in claim 3 is characterized in that, with said weight coefficient renewal amount weight coefficient is carried out recurrence and upgrades by expression definite:
W(n+1)=W(n)+k(n)；
Wherein, W (n) is the weight coefficient of current period, and k (n) is the weight coefficient renewal amount of current period, and W (n+1) is the time-delay back weight coefficient of following one-period.
5. narrow-band interference rejection method as claimed in claim 4 is characterized in that, said weight coefficient renewal amount is confirmed by expression:
k(n)=step*y(n)*conj[p(n)]；
Wherein, step is the configuration constant, and said configuration constant is used for confirming the speed and the precision of recurrence convergence.
6. narrow-band interference rejection method as claimed in claim 4 is characterized in that, said weight coefficient renewal amount is confirmed by expression:
k(n)=[1/(delta(n)]*y(n)*conj[p(n)]；
delta(n)=lamda*delta(n-1)+p(n)*conj[p(n)]；
Wherein, delta (n) is a recursion coefficient, and lamda is the configuration constant, and the span of said configuration constant is (0,1).
7. narrow-band interference rejection method as claimed in claim 1 is characterized in that, produces local oscillated signal through phase-locked loop, and carries out the comparison of said local oscillated signal and narrow band interference, the renewal of local oscillated signal.
8. narrow-band interference rejection method as claimed in claim 1 is characterized in that, the reception signal for including a plurality of narrow band interference repeatedly repeats said narrow-band interference rejection method, until eliminating detected a plurality of narrow band interference.
9. a Suppression of narrow band interference device is characterized in that, comprising: frequency is confirmed unit, adaptive-filtering unit and interference cancellation unit, wherein,
Frequency confirms that the unit confirm to receive the frequency location of narrow band interference in the signal, forms the local oscillated signal that includes the narrow band interference frequency information, and with said local oscillated signal as a reference noise source offer the adaptive-filtering unit; Wherein, said frequency confirms that the unit is a phase-locked loop structures, comprising: error extracting device, loop filter and digital controlled oscillator; Wherein, the local oscillated signal of the more said digital controlled oscillator of said error extracting device output and the error that receives narrow-band interference of signal, and said error signal offered in the said loop filter; Said loop filter carries out filtering to said error signal, forms control signal, said control signal and error signal positive correlation, and error signal is more little, and the amplitude of control signal is more little; Said digital controlled oscillator receives the control signal that said loop filter provides, and different according to the amplitude of said control signal, forms the local oscillated signal of different frequency, and said local oscillated signal is fed back to the error extracting device;
The adaptive-filtering unit converts said reference noise source into the simulaed interference signal consistent with narrow band interference, and the said simulaed interference signal consistent with narrow band interference offered interference cancellation unit;
Interference cancellation unit is eliminated the said simulaed interference signal consistent with narrow band interference from receive signal.
10. Suppression of narrow band interference device as claimed in claim 9 is characterized in that, said adaptive-filtering unit comprises renewal amount setup unit, adder unit, delay unit and interference synthesis unit, wherein,
Renewal amount setup unit receive frequency is confirmed the output signal of reference noise source that the unit provides and interference cancellation unit feedback; The product of the conjugate in said reference noise source, configuration constant and output signal as the weight coefficient renewal amount, and is offered adder unit with said weight coefficient renewal amount;
The weight coefficient renewal amount addition of the weight coefficient of the last one-period that adder unit will be delayed time and current period realizes the renewal of weight coefficient, and said weight coefficient is offered delay unit;
Behind the weight coefficient time-delay one-period that delay unit provides adder unit, offer adder unit respectively and disturb synthesis unit;
Disturb synthesis unit that said weight coefficient and reference noise source are synthesized, as simulaed interference signal, and said simulaed interference signal sent into interference cancellation unit with the product in the conjugate of said weight coefficient and reference noise source;
Said interference cancellation unit feeds back to the renewal amount setup unit to receive the poor as the output signal of signal and simulaed interference signal.
11. Suppression of narrow band interference device as claimed in claim 9; It is characterized in that; Said adaptive-filtering unit comprises renewal amount setup unit, first adder unit, first delay unit, disturbs synthesis unit, second adder unit, second delay unit, coefficient dispensing unit and recurrence renewal amount unit, wherein:
Renewal amount setup unit receive frequency is confirmed reference noise source that the unit provides, recursion coefficient that second delay unit provides and the output signal of interference cancellation unit feedback; The product of the reciprocal of the conjugate in said reference noise source, recursion coefficient and output signal as the weight coefficient renewal amount, and is offered first adder unit with said weight coefficient renewal amount;
The weight coefficient renewal amount addition of the weight coefficient of the last one-period that first adder unit will be delayed time and current period realizes the renewal of weight coefficient, and said weight coefficient is offered first delay unit;
Behind the weight coefficient time-delay one-period that first delay unit provides first adder unit, offer first adder unit respectively and disturb synthesis unit;
Disturb synthesis unit that the weight coefficient that first delay unit provides is synthesized with the reference noise source, as simulaed interference signal, and said simulaed interference signal sent into interference cancellation unit with the product in the conjugate of said weight coefficient and reference noise source;
Recurrence renewal amount unit receive frequency is confirmed the reference noise source that the unit provides, and as the recursion coefficient renewal amount, and said recursion coefficient renewal amount is offered second adder unit with the product in the conjugate in said reference noise source and reference noise source;
The coefficient dispensing unit multiplies each other the recursion coefficient that second delay unit provides with the configuration constant, and the recursion coefficient after the said configuration is offered second adder unit;
Second adder unit will go up one-period through the recursion coefficient and the recursion coefficient renewal amount addition of current period after the configuration of coefficient dispensing unit, the renewal of completion recursion coefficient, and said recursion coefficient offered second delay unit;
Behind the recursion coefficient time-delay one-period that second delay unit provides second adder unit, deliver to coefficient dispensing unit and renewal amount setup unit respectively;
Said interference cancellation unit feeds back to the renewal amount setup unit to receive the poor as the output signal of signal and simulaed interference signal.
12. Suppression of narrow band interference device as claimed in claim 9 is characterized in that, said frequency confirms that the unit is a phase-locked loop.
13. Suppression of narrow band interference device as claimed in claim 9 is characterized in that, for the reception signal that includes a plurality of narrow band interference, said Suppression of narrow band interference device is connected in series, and eliminates said a plurality of narrow band interference respectively.
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| CN102347778B (en) * | 2011-08-05 | 2014-01-22 | 中国舰船研究设计中心 | Self-adapting interference cancellation device and debugging method thereof |
| CN102281218B (en) * | 2011-08-18 | 2017-07-28 | 泰凌微电子（上海）有限公司 | DC-offset eliminating system and its method |
| CN103369651A (en) * | 2012-03-29 | 2013-10-23 | 中兴通讯股份有限公司 | Method for allocating downlink transmission power in long-term evolution system and device thereof |
| CN104111465B (en) * | 2014-07-29 | 2017-06-13 | 上海北伽导航科技有限公司 | The estimator of continuous wave CO_2 laser signal, method of estimation, arrester and removing method |
| CN106341123B (en) * | 2015-07-07 | 2019-09-06 | 上海无线通信研究中心 | A kind of filtering method and device of single tone jamming |
| CN105652291A (en) * | 2015-12-29 | 2016-06-08 | 西安航天华迅科技有限公司 | Anti-narrow band interference adaptive filter, system and adaptive filtering method |
| CN108631801B (en) * | 2017-03-20 | 2020-06-05 | 展讯通信（上海）有限公司 | Method and device for selecting intermediate frequency position of low intermediate frequency signal and receiver |
| CN110176943A (en) * | 2018-03-07 | 2019-08-27 | 中国电子科技集团公司第三十研究所 | A kind of short-wave reception is with road Suppression of narrow band interference system |
| CN111983646B (en) * | 2018-12-29 | 2023-03-17 | 上海司南卫星导航技术股份有限公司 | Receiving device, terminal device and computer readable storage medium |
| CN111698022B (en) * | 2019-01-03 | 2022-02-08 | 长沙天仪空间科技研究院有限公司 | Satellite communication system based on narrow-band multi-channel communication interference suppression |
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| CN101521643A (en) * | 2009-03-30 | 2009-09-02 | 华为技术有限公司 | Method and system for processing interference signal |
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