CN102904604B - Narrow-band interference suppression method and device - Google Patents
Narrow-band interference suppression method and device Download PDFInfo
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- CN102904604B CN102904604B CN201210333683.3A CN201210333683A CN102904604B CN 102904604 B CN102904604 B CN 102904604B CN 201210333683 A CN201210333683 A CN 201210333683A CN 102904604 B CN102904604 B CN 102904604B
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Abstract
The invention relates to a narrow-band interference suppression method and a narrow-band interference suppression device. The device comprises an adaptive filter module, a fast Fourier transformation module, a narrow-band interference suppression module and a fast inverse Fourier transformation module. The method comprises the following steps of: 1) forecasting a dispersion sequence obtained through sampling to obtain a narrow-band interference forecast signal according to an adaptive algorithm; 2) multiplying the narrow-band interference forecast signal by a factor K to obtain a forecast factor signal, and subtracting the forecast factor signal from a received signal to obtain a first signal; 3) transforming the first signal to a frequency domain, and performing frequency domain wave trapping processing on the first signal in the frequency domain; and 4) converting the first signal subjected to frequency domain wave trapping into a second signal in a time domain, and inputting the second signal into a spread spectrum signal demodulator to finish narrow-band interference suppression. By the method, the shortcoming that a time domain adaptive filter cannot completely suppress the interference is overcome; and energy leakage in a frequency domain wave trapper is reduced.
Description
Technical field
The invention relates to digital communicating field, be specifically related to a kind of narrow-band interference rejection method in spread spectrum system.
Background technology
Spread spectrum communication system has certain antijamming capability, but when spreading gain in spread spectrum system is less or interference strength is larger, takes effective Interference Detection and suppression strategy to be very important at spread spectrum system receiving terminal.According to the difference of processing domain, existing arrowband interference (Narrowband Interference, NBI) Restrainable algorithms can be divided into two large classes: the location of the estimation of time domain and minimizing technology and transform domain and suppressing method.
Particularly, Time-Domain algorithm general spread-spectrum signal and the difference of NBI in correlation (i.e. predictability) are estimated NBI, and are subtracted each other by time domain and removed.The Classical examples of this algorithm is sef-adapting filter, and sef-adapting filter adopts certain adaptive algorithm (such as LMS, ACM, DDK etc.) to carry out predicted estimate to interference.As application number: the patent application of CN102263574A, " arrowband Interference Detection and suppressing method in a kind of communication system, device and receiver, disclose a kind of method using sef-adapting filter Interference Detection suppression in arrowband spread spectrum communication, by carrying out grouping cache to received signal, calculate autocorrelation matrix, the process such as power normalization suppresses multiple interference, there is complexity low, the feature of strong robustness " but due to the exponent number of filter and the restriction of adaptive algorithm precision, the suppression of usual self-adaptive filters in time area device to interference is thorough not, especially when disturbing larger, remaining interference components is larger.
Position and bandwidth that transform domain technology then utilizes both differences on spectrum signature (i.e. power spectrum integrated distribution, the high density of smooth, the low-density of the power spectrum of spread-spectrum signal and NBI) to detect to disturb, certain notch technology is adopted to suppress interference.The most frequently used is frequency domain trapper, namely transforms to frequency domain by FFT, carrying out interference location, then carrying out zero setting trap to the frequency band at interference place and realizing AF panel at frequency domain by comparing based on thresholding.As the patent No.: the patent of ZL 200580047600.2, eliminated the method and apparatus of arrowband interference by windowing process in spread spectrum system, disclose a kind of by carrying out Spectrum Conversion to sampled point, and to sampled point carrying out on setting-up time energy value and threshold value and to comparing, determine width and the position of the number that arrowband disturbs and each arrowband, determine corresponding frequency domain adjustment window further.But do not distinguish interference and spread-spectrum signal due to during process, and in FFT process, arrowband interference energy leakage can occur, therefore, this algorithm is inevitable to the damage of spread-spectrum signal, and interference is larger, larger to the damage of spread-spectrum signal.
Summary of the invention
The present invention, by the pluses and minuses in conjunction with two class algorithms, overcomes the deficiency of existing two class algorithms, provides the suppressing method of a kind of arrowband interference in spread spectrum system.The spread-spectrum signal disturbed containing arrowband is carried out successively self-adaptive filters in time area device and the process of frequency domain trapper, the method is applicable to the scene of large interference well, compared with existing two class algorithms, has better rejection.
In order to reach above object, technical scheme of the present invention is: the narrow-band interference rejection method in a kind of spread spectrum system, and its step comprises:
1) Received signal strength discrete series is obtained to the analog signal sampling of receiving terminal, according to adaptive algorithm, prediction is carried out to this discrete series and obtain arrowband interference prediction signal;
2) by described arrowband interference prediction signal times with factor k, obtain predictive factor signal, and in described Received signal strength, deduct described predictive factor signal obtain the first signal,
3) according to fast Fourier transform, described first signal is transformed to frequency domain, frequency domain carries out the process of frequency domain trap to described first signal, obtain the first signal after the process of frequency domain trap;
4) the first signal after the process of described frequency domain trap be converted into the secondary signal in time domain and be input to the demodulator of spread-spectrum signal, completing Suppression of narrow band interference.
Described step 2) in factor k meet: described first signal signal interference ratio component is greater than described step 1) adaptive-filtering process and/or described step 3) setting thresholding in the process of frequency domain trap.
Described step 1) in adaptive algorithm be selected from one of LMS, Kalman, ACM, DDK algorithm.
Described step 3) frequency domain trap handling process is:
I) by fast Fourier transform, described first signal is transformed to frequency domain, whether recycling threshold comparative law detects narrow-band interference signal in this first signal exists, if exist, utilizes energy measuring method to detect narrow-band interference signal position;
Ii) frequency band at described narrow-band interference signal place is carried out trap process, eliminate the narrow-band interference signal still existed.
One of trapezoid window, triangular window, raised cosine window, Hamming window is adopted to carry out windowing process to described first signal before described fast Fourier transform.
Described fast Fourier transform operation selects overlap to block Overlap-Cut operational processes.
A Suppression of narrow band interference device in spread spectrum system, comprising: sef-adapting filter module, fast Fourier transform module, Suppression of narrow band interference module and inverse fast Fourier transform module, is characterized in that,
Described sef-adapting filter module, the analog signal sampling for receiving terminal obtains Received signal strength discrete series, carries out prediction obtain arrowband interference prediction signal according to adaptive algorithm to this discrete series; And obtain predictive factor signal, and deduct in described Received signal strength after described predictive factor signal obtains the first signal and input fast Fourier transform module;
Described fast Fourier transform module, transforms to frequency domain according to fast Fourier transform to by described first signal;
Described AF panel module, frequency domain carries out the process of frequency domain trap to described first signal, obtains the first signal after the process of frequency domain trap;
Further, described inverse fast Fourier transform module, for being converted into the secondary signal in time domain by the first signal after described frequency domain trap.
Further, LMS, Kalman, ACM, DDK filter is adopted in described adaptive-filtering module.
Further, described predictive factor signal signal interference ratio component is greater than the setting thresholding in sef-adapting filter and/or frequency domain trapper;
As factor k=0, described first signal equals Received signal strength; Described device comprises frequency domain trapper;
As factor k=1, described first signal equals described Received signal strength and deducts described predictive factor signal, self-adaptive filters in time area device module and frequency domain trapper block coupled in series in described device;
Factor k meets: described first signal signal interference ratio component is greater than the setting thresholding in sef-adapting filter and/or frequency domain trapper.
Further, be provided with an analog to digital converter at receiving terminal, Received signal strength discrete series is obtained to the analog signal sampling of receiving terminal.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention proposes the narrow-band interference rejection method in a kind of spread spectrum system.The method combines the pluses and minuses of existing self-adaptive filters in time area device and frequency domain trapper, the carrying out that the spread-spectrum signal disturbed containing arrowband enters out-of-date domain adaptive filter and frequency domain trapper is successively processed, efficiently avoid the halfway shortcoming of self-adaptive filters in time area device AF panel, alleviate the problem of energy leakage in frequency domain trapper simultaneously.Especially, in the scene that narrow-band interference strength is larger, this algorithm has better performance compared with existing algorithm.
Accompanying drawing explanation
Fig. 1 is the narrow-band interference rejection method flow chart in spread spectrum system of the present invention;
Fig. 2 is the process block diagram of narrow-band interference rejection method in narrow-band interference rejection method one embodiment in spread spectrum system of the present invention;
Fig. 3 is the performance comparison analogous diagram with existing algorithm in narrow-band interference rejection method one embodiment in spread spectrum system of the present invention.
Embodiment
As shown in Figure 1, now describe in detail the narrow-band interference rejection method in a kind of spread spectrum system of the present invention, its step comprises:
1) at receiving terminal, the Received signal strength of simulation is sampled through ADC (analog to digital converter), generate discrete series, be expressed as r (n), r (n)=s (n)+v (n)+w (n), wherein n is discrete series sequence number, and s (n) is spread-spectrum signal, v (n) is narrow-band interference signal, and w (n) is the white Gaussian noise in channel;
2) Received signal strength r (n) is sent into self-adaptive filters in time area device, narrow-band interference signal v (n) is given a forecast, obtain the narrow-band interference signal predicted
3) by the interference of the arrowband of prediction
be multiplied by factor k (0≤k≤1), and deduct from Received signal strength, obtain signal s
1(n),
4) by s
1n () signal input frequency domain trapper, does trap at frequency domain to interference signal and removes, obtain outputing signal s
2n (), completes the process of inhibition of arrowband interference, and by s
2n () signal is input to the demodulator of spread-spectrum signal.
In described step 2) in narrow-band interference signal v (n) is given a forecast, self-adaptive filters in time area device can adopt common various adaptive algorithms, as filters such as LMS, Kalman, ACM, DDK.
In described step 3) middle factor k decision algorithm performance.As k=0, method of the present invention is equivalent to frequency domain trapper, and as k=1, this algorithm is equivalent to connecting of self-adaptive filters in time area device and frequency domain trapper.The optimum value of k is selected criterion and is: the selection of k should ensure s
1signal interference ratio (the Signal to Interference Ratio of (n), SIR) component is greater than certain threshold, this thresholding depends on the sef-adapting filter of use and the algorithm of frequency domain trapper and parameter, particularly, factor k meets: described first signal signal interference ratio component is greater than described step 1) adaptive-filtering process and/or described step 3) setting thresholding in the process of frequency domain trap.
In described step 4) in frequency domain trapper be existing algorithm flow, namely first by FFT by s
1n () transforms to frequency domain, the method utilizing thresholding to compare detects presence or absence and the position of interference, then the frequency band at interference place is carried out trap process, transforms to time domain, complete AF panel finally by IFFT.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Below with reference to Fig. 2, the Suppression of narrow band interference device in one embodiment of the invention in spread spectrum system comprises: sef-adapting filter module 1, fast Fourier transform FFT module 2, Suppression of narrow band interference module 3, inverse fast Fourier transform IFFT module 4.
The realization flow of this device is:
1) sef-adapting filter module 1 to received signal r (n) carry out the prediction of arrowband interference, obtain disturb prediction signal
wherein filter order is 31 rank, and the renewal Coefficient Algorithm of filter is LMS algorithm, is specially:
α
i(n+1)＝α
i(n)+μr(n-i)e(n),i＝1,2,...,M
Wherein i is filter coefficient sequence number, and M is filter order, α
ifor filter coefficient, e (n) is output feedback signal, and μ is the stepping of coefficient adjustment.
2) factor k is multiplied by interference prediction signal v (n), and deducts from Received signal strength r (n), obtains signal s
1n (), wherein the value of k ensures s
1n the SIR of () equals-10dB.
3) fast Fourier transform module FFT module 2 is by s
1n () signal transforms to frequency domain.Wherein, it is 256 points that FFT counts, and simultaneously in order to reduce the energy leakage of arrowband interference, needing windowing process in the pre-fft, having selected Trapezoid Window Function in this example, also can adopt triangular window, raised cosine window, Hamming window.FFT operation has selected the operational processes of Overlap-Cut, in order to realize the object of linear convolution in addition.
4) AF panel module 3 detects the position of interference at frequency domain by the method for energy measuring, then carries out zero setting to the frequency at interference place and eliminates interference.
5) frequency-region signal after interference elimination is converted into time-domain signal by inverse fast Fourier transform IFFT module 4, obtains signal s
2n (), completes the process of inhibition of arrowband interference.
Fig. 3 gives the performance comparison of suppressing method in this example and existing time domain LMS algorithm filter and frequency domain trapper algorithm, simulated conditions is: spread spectrum system is WCDMA system, and spreading factor is 4, and narrow-band interference signal is GSM signal, AWGN signal, SNR=-3.5dB.In figure, abscissa is SIR, and ordinate is Block Error Rate (BLER), and can find out that the suppressing method that this method provides can make the Block Error Rate of system lower, performance is better.
Described the suppressing method of a kind of arrowband interference in spread spectrum system provided by the present invention above by specific embodiment, it will be understood by those of skill in the art that in the scope not departing from essence of the present invention, certain distortion or amendment can be made to the present invention; Its preparation method is also not limited to content disclosed in embodiment.
Claims (8)
1. the narrow-band interference rejection method in spread spectrum system, its step comprises:
1) Received signal strength discrete series is obtained to the analog signal sampling of receiving terminal, according to adaptive algorithm, prediction is carried out to this discrete series and obtain arrowband interference prediction signal;
2) by described arrowband interference prediction signal times with factor k, obtain predictive factor signal, and in described Received signal strength, deduct described predictive factor signal obtain the first signal,
3) according to fast Fourier transform, described first signal is transformed to frequency domain, frequency domain carries out the process of frequency domain trap to described first signal, obtain the first signal after the process of frequency domain trap;
4) the first signal after the process of described frequency domain trap be converted into the secondary signal in time domain and be input to the demodulator of spread-spectrum signal, completing Suppression of narrow band interference;
As factor k=0, described first signal equals Received signal strength; As factor k=1, described first signal equals described Received signal strength and deducts described predictive factor signal, and factor k meets: described first signal signal interference ratio component is greater than described step 1) adaptive-filtering process and/or described step 3) setting thresholding in the process of frequency domain trap.
2. the narrow-band interference rejection method in spread spectrum system as claimed in claim 1, is characterized in that, described step 1) in adaptive algorithm be selected from one of LMS, Kalman, ACM, DDK algorithm.
3. the narrow-band interference rejection method in spread spectrum system as claimed in claim 1, is characterized in that, described step 3) frequency domain trap handling process is:
I) by fast Fourier transform, described first signal is transformed to frequency domain, whether recycling threshold comparative law detects narrow-band interference signal in this first signal exists, if exist, utilizes energy measuring method to detect narrow-band interference signal position;
Ii) frequency band at described narrow-band interference signal place is carried out trap process, eliminate the narrow-band interference signal still existed.
4. the narrow-band interference rejection method in spread spectrum system as claimed in claim 1, is characterized in that, adopts the one in trapezoid window, triangular window, raised cosine window, Hamming window to carry out windowing process before described fast Fourier transform to described first signal.
5. the narrow-band interference rejection method in spread spectrum system as claimed in claim 1, is characterized in that, described fast Fourier transform operation selects overlap to block Overlap-Cut operational processes.
6. the Suppression of narrow band interference device in spread spectrum system, comprising: sef-adapting filter module, fast Fourier transform module, Suppression of narrow band interference module and inverse fast Fourier transform module, is characterized in that,
Described sef-adapting filter module, the analog signal sampling for receiving terminal obtains Received signal strength discrete series, carries out prediction obtain arrowband interference prediction signal according to adaptive algorithm to this discrete series; And obtain predictive factor signal, and deduct in described Received signal strength after described predictive factor signal obtains the first signal and input fast Fourier transform module, described predictive factor signal signal interference ratio component is greater than the setting thresholding in sef-adapting filter and/or frequency domain trapper;
As factor k=0, described first signal equals Received signal strength; Described device comprises frequency domain trapper;
As factor k=1, described first signal equals described Received signal strength and deducts described predictive factor signal, self-adaptive filters in time area device module and frequency domain trapper block coupled in series in described device;
Factor k meets: described first signal signal interference ratio component is greater than the setting thresholding in sef-adapting filter and/or frequency domain trapper;
Described fast Fourier transform module, transforms to frequency domain according to fast Fourier transform to by described first signal;
Described AF panel module, frequency domain carries out the process of frequency domain trap to described first signal, obtains the first signal after the process of frequency domain trap;
Described inverse fast Fourier transform module, for being converted into the secondary signal in time domain by the first signal after described frequency domain trap.
7. the Suppression of narrow band interference device in spread spectrum system as claimed in claim 6, is characterized in that, adopt the one in LMS, Kalman, ACM, DDK filter in described adaptive-filtering module.
8. the Suppression of narrow band interference device in spread spectrum system as claimed in claim 6, is characterized in that, be provided with an analog to digital converter at receiving terminal, obtain Received signal strength discrete series to the analog signal sampling of receiving terminal.
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| DE102015001106B4 (en) * | 2015-02-01 | 2016-12-15 | IAD Gesellschaft für Informatik, Automatisierung und Datenverarbeitung mbH | A method of frequency and time selective interference cancellation for a communication system based on OFDM and receivers therefor |
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| CN109698712B (en) * | 2018-12-28 | 2020-11-27 | 长沙天仪空间科技研究院有限公司 | Narrow band satellite communication system |
| CN111628816B (en) * | 2019-01-03 | 2022-02-01 | 长沙天仪空间科技研究院有限公司 | Narrow-band interference suppression method of satellite communication system |
| CN115133940A (en) * | 2022-06-28 | 2022-09-30 | 恒玄科技(上海)股份有限公司 | Method and device for inhibiting Bluetooth interference in WiFi signal and signal receiving and transmitting device |
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