CN102904604A - Narrow-band interference suppression method and device - Google Patents
Narrow-band interference suppression method and device Download PDFInfo
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- CN102904604A CN102904604A CN2012103336833A CN201210333683A CN102904604A CN 102904604 A CN102904604 A CN 102904604A CN 2012103336833 A CN2012103336833 A CN 2012103336833A CN 201210333683 A CN201210333683 A CN 201210333683A CN 102904604 A CN102904604 A CN 102904604A
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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 the spread spectrum system.
Background technology
Spread spectrum communication system has certain antijamming capability, but when less or interference strength is larger, takes effective Interference Detection and suppression strategy to be very important at the spread spectrum system receiving terminal when spreading gain in the spread spectrum system.According to the difference of processing domain, existing arrowband disturbs (Narrowband Interference, NBI) Restrainable algorithms can be divided into two large classes: the time domain estimation and removal method and transform domain location and inhibition method.
Particularly, Time-Domain algorithm general using spread-spectrum signal and the NBI difference on correlation (being predictability) estimates NBI, and subtracts each other by time domain and to be 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.) that estimation is predicted in interference.Patent application such as application number: CN102263574A, " arrowband Interference Detection and inhibition method in a kind of communication system; device and receiver; disclose a kind of sef-adapting filter method that Interference Detection suppresses in the arrowband spread spectrum communication of using; by carrying out to received signal grouping cache; calculate autocorrelation matrix; power normalization etc. are processed and suppressed multiple interference, has complexity low, the characteristics of strong robustness " but because the exponent number of filter and the restriction of adaptive algorithm precision; the self-adaptive filters in time area device is thorough not to the inhibition of disturbing usually; especially when interference was larger, remaining interference components was larger.
The transform domain technology then utilize both differences on spectrum signature (power spectrum that is spread-spectrum signal is smooth, low-density and the power spectrum of NBI concentrate distribute, high density) detect the position of disturbing and bandwidth, the certain notch technology of employing suppresses interference.The most frequently used is the frequency domain trapper, namely transforms to frequency domain by FFT,, then the frequency band that disturbs the place is carried out the zero setting trap and realizes disturbing inhibition by relatively disturbing the location based on thresholding at frequency domain.Patent such as the patent No.: ZL200580047600.2, eliminate the method and apparatus that the arrowband disturbs by windowing process in the spread spectrum system, disclose a kind of by sampled point is carried out Spectrum Conversion, and to carrying out energy value and threshold value and to relatively at setting-up time on the sampled point, determine number and width and the position of each arrowband, further definite corresponding frequency domain adjustment window that the arrowband disturbs.Yet, do not distinguish during owing to processing and disturb and spread-spectrum signal, and the arrowband disturbs meeting generation energy leakage in the FFT process, therefore, this algorithm is inevitable to the damage of spread-spectrum signal, and interference is larger, and is larger to the damage of spread-spectrum signal.
Summary of the invention
The present invention has overcome the deficiency of existing two class algorithms by the pluses and minuses in conjunction with two class algorithms, and the inhibition method that a kind of arrowband disturbs in the spread spectrum system is provided.To contain the spread-spectrum signal that disturbs by the arrowband and carry out successively self-adaptive filters in time area device and the processing of frequency domain trapper, the method is applicable to the large scene of disturbing well, compares with existing two class algorithms, has better rejection.
In order to reach above purpose, 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) analog signal sampling of receiving terminal obtained receiving the signal discrete sequence, according to adaptive algorithm this discrete series is predicted to obtain the arrowband interference prediction signal;
2) with described arrowband interference prediction signal times with factor K, obtain the predictive factor signal, and in described reception signal, deduct described predictive factor signal and obtain first signal,
3) according to fast Fourier transform described first signal is transformed to frequency domain, on frequency domain, described first signal is carried out the frequency domain trap and process, obtain the first signal after the frequency domain trap is processed;
4) first signal after described frequency domain trap is processed is converted into the secondary signal on the time domain and is input to the demodulator of spread-spectrum signal, finishes Suppression of narrow band interference.
Described step 2) factor K in satisfies: described first signal signal interference ratio component is greater than the setting thresholding in described step 1) adaptive-filtering processing and/or the processing of described step 3) frequency domain trap.
Adaptive algorithm in the described step 1) is 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, recycling thresholding comparison method detects whether narrow-band interference signal exists in this first signal, if exist, utilizes the energy measuring method to detect the narrow-band interference signal position;
Ii) the frequency band with described narrow-band interference signal place carries out the trap processing, eliminates the narrow-band interference signal that still exists.
Before the described fast Fourier transform described first signal is adopted trapezoid window, triangular window, raised cosine window, Hamming window windowing process.
The overlapping Overlap-Cut of blocking operational processes is selected in described fast Fourier transform operation.
Suppression of narrow band interference device in a kind of spread spectrum system comprises: sef-adapting filter module, fast Fourier transform module, Suppression of narrow band interference module and inverse fast Fourier transform module, it is characterized in that,
Described sef-adapting filter module, the analog signal sampling that is used for receiving terminal obtains receiving the signal discrete sequence, according to adaptive algorithm this discrete series is predicted to obtain arrowband interference prediction signal; And obtain the predictive factor signal, and in described reception signal, deduct and input fast Fourier transform module after described predictive factor signal obtains first signal;
Described fast Fourier transform module, according to fast Fourier transform to described first signal is transformed to frequency domain;
Described interference suppresses module, on frequency domain described first signal is carried out the frequency domain trap and processes, the first signal after obtaining that the frequency domain trap processes;
Further, described inverse fast Fourier transform module is for the secondary signal that the first signal behind the described frequency domain trap is converted on the time domain.
Further, adopt LMS, Kalman, ACM, DDK filter in the 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 the frequency domain trapper;
When factor k=0, described first signal equals to receive signal; Comprise the frequency domain trapper in the described device;
When factor k=1, described first signal equals described reception signal and deducts described predictive factor signal, and self-adaptive filters in time area device module is connected with frequency domain trapper module in the described device;
Factor k satisfies: described first signal signal interference ratio component is greater than the setting thresholding in sef-adapting filter and/or the frequency domain trapper.
Further, be provided with an analog to digital converter at receiving terminal, the analog signal sampling of receiving terminal is obtained receiving the signal discrete sequence.
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, to contain the spread-spectrum signal that disturbs by the arrowband and advance successively processing of out-of-date domain adaptive filter and frequency domain trapper, effectively avoid the self-adaptive filters in time area device to disturb and suppressed halfway shortcoming, alleviated simultaneously the problem of energy leakage in the frequency domain trapper.Especially in the larger scene of narrow-band interference strength, this algorithm is compared with existing algorithm has better performance.
Description of drawings
Fig. 1 is the narrow-band interference rejection method flow chart in the spread spectrum system of the present invention;
Fig. 2 is the processing block diagram of narrow-band interference rejection method among narrow-band interference rejection method one embodiment in the spread spectrum system of the present invention;
Fig. 3 be among narrow-band interference rejection method one embodiment in the spread spectrum system of the present invention with existing Algorithm Performance contrast simulation figure.
Embodiment
As shown in Figure 1, now the narrow-band interference rejection method in a kind of spread spectrum system of the present invention is described in detail, its step comprises:
1) at receiving terminal, the reception signal of simulation is through the ADC(analog to digital converter) sampling, generate discrete series, be expressed as r (n), r (n)=s (n)+v (n)+w (n), wherein n is the discrete series sequence number, s (n) is spread-spectrum signal, v (n) is narrow-band interference signal, and w (n) is the white Gaussian noise in the channel;
2) will receive signal r (n) and send into the self-adaptive filters in time area device, narrow-band interference signal v (n) be given a forecast the narrow-band interference signal that obtains predicting
3) arrowband with prediction disturbs
Multiply by factor k (0≤k≤1), and from receive signal, deduct, obtain signal s
1(n),
4) with s
1(n) signal input frequency domain trapper is done trap at frequency domain to interference signal and is removed, and obtains output signal s
2(n), finish the process of inhibition that the arrowband disturbs, and with s
2(n) 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, the self-adaptive filters in time area device can adopt common various adaptive algorithms, such as filters such as LMS, Kalman, ACM, DDK.
In described step 3) in factor k determine algorithm performance.When k=0, method of the present invention is equivalent to the frequency domain trapper, and when 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: the selection of k should guarantee s
1(n) signal interference ratio (Signal to Interference Ratio, SIR) component is greater than certain threshold, and this thresholding depends on algorithm and the parameter of sef-adapting filter and the frequency domain trapper of use.
In described step 4) in the frequency domain trapper be existing algorithm flow, namely first by FFT with s
1(n) transform to frequency domain, utilize the method for thresholding comparison to detect having or not and the position of disturbing, then will disturb the frequency band at place to carry out the trap processing, transform to time domain by IFFT at last, finish to disturb and suppress.
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 the 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 that the arrowband disturbs, the prediction signal that obtains disturbing
Wherein filter order is 31 rank, and the update coefficients algorithm of filter is the LMS algorithm, is specially:
α
i(n+1)=α
i(n)+μr(n-i)e(n),i=1,2,...,M
Wherein i is the filter coefficient sequence number, and M is filter order, α
iBe filter coefficient, e (n) is output feedback signal, and μ is the stepping of coefficient adjustment.
2) interference prediction signal
Multiply by factor k, and from receive signal r (n), deduct, obtain signal s
1(n), wherein the value of k guarantees s
1(n) SIR equals-10dB.
3) fast Fourier transform module FFT module 2 is with s
1(n) signal transforms to frequency domain.Wherein, it is 256 points that FFT counts, and the energy leakage that disturbs in order to reduce the arrowband simultaneously needed windowing process before FFT, selected Trapezoid Window Function in this example, also can adopt triangular window, raised cosine window, Hamming window.The operational processes of Overlap-Cut has been selected in the FFT operation in addition, in order to realize the purpose of linear convolution.
4) disturb inhibition module 3 to detect the position of interference by the method for energy measuring at frequency domain, then the frequency that disturbs the place is carried out the zero setting elimination and disturb.
5) inverse fast Fourier transform IFFT module 4 will disturb the frequency-region signal after eliminating to be converted into time-domain signal, obtain signal s
2(n), finish the process of inhibition that the arrowband disturbs.
Fig. 3 has provided inhibition method and existing time domain LMS algorithm filter and the contrast of frequency domain trapper Algorithm Performance in this example, simulated conditions is: spread spectrum system is the WCDMA system, and spreading factor is 4, and narrow-band interference signal is the GSM signal, the AWGN signal, SNR=-3.5dB.Abscissa is SIR among the figure, and ordinate is Block Error Rate (BLER), can find out that the inhibition method that this method provides can be so that the Block Error Rate of system be lower, and performance is better.
The above inhibition method of having described a kind of arrowband interference in the spread spectrum system provided by the present invention by specific embodiment it will be understood by those of skill in the art that in the scope that does not break away from essence of the present invention, can make certain distortion or modification to the present invention; Its preparation method also is not limited to disclosed content among the embodiment.
Claims (10)
1. the narrow-band interference rejection method in the spread spectrum system, its step comprises:
1) analog signal sampling of receiving terminal obtained receiving the signal discrete sequence, according to adaptive algorithm this discrete series is predicted to obtain the arrowband interference prediction signal;
2) with described arrowband interference prediction signal times with factor K, obtain the predictive factor signal, and in described reception signal, deduct described predictive factor signal and obtain first signal,
3) according to fast Fourier transform described first signal is transformed to frequency domain, on frequency domain, described first signal is carried out the frequency domain trap and process, obtain the first signal after the frequency domain trap is processed;
4) first signal after described frequency domain trap is processed is converted into the secondary signal on the time domain and is input to the demodulator of spread-spectrum signal, finishes Suppression of narrow band interference.
2. the narrow-band interference rejection method in the spread spectrum system as claimed in claim 1, it is characterized in that described step 2) in factor K satisfy: described first signal signal interference ratio component is processed greater than described step 1) adaptive-filtering and/or the setting thresholding of described step 3) frequency domain trap in processing.
3. the narrow-band interference rejection method in the spread spectrum system as claimed in claim 1 is characterized in that, the adaptive algorithm in the described step 1) is selected from one of LMS, Kalman, ACM, DDK algorithm.
4. the narrow-band interference rejection method in the 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, recycling thresholding comparison method detects whether narrow-band interference signal exists in this first signal, if exist, utilizes the energy measuring method to detect the narrow-band interference signal position;
Ii) the frequency band with described narrow-band interference signal place carries out the trap processing, eliminates the narrow-band interference signal that still exists.
5. the narrow-band interference rejection method in the spread spectrum system as claimed in claim 1 is characterized in that, before the described fast Fourier transform described first signal is adopted trapezoid window, triangular window, raised cosine window, Hamming window windowing process.
6. the narrow-band interference rejection method in the spread spectrum system as claimed in claim 1 is characterized in that, the overlapping Overlap-Cut of blocking operational processes is selected in described fast Fourier transform operation.
7. the Suppression of narrow band interference device in the spread spectrum system comprises: sef-adapting filter module, fast Fourier transform module, Suppression of narrow band interference module and inverse fast Fourier transform module, it is characterized in that,
Described sef-adapting filter module, the analog signal sampling that is used for receiving terminal obtains receiving the signal discrete sequence, according to adaptive algorithm this discrete series is predicted to obtain arrowband interference prediction signal; And obtain the predictive factor signal, and in described reception signal, deduct and input fast Fourier transform module after described predictive factor signal obtains first signal;
Described fast Fourier transform module, according to fast Fourier transform to described first signal is transformed to frequency domain;
Described interference suppresses module, on frequency domain described first signal is carried out the frequency domain trap and processes, the first signal after obtaining that the frequency domain trap processes;
Described inverse fast Fourier transform module is for the secondary signal that the first signal behind the described frequency domain trap is converted on the time domain.
8. the Suppression of narrow band interference device in the spread spectrum system as claimed in claim 7 is characterized in that, adopts LMS, Kalman, ACM, DDK filter in the described adaptive-filtering module.
9. the Suppression of narrow band interference device in the spread spectrum system as claimed in claim 7 is characterized in that, described predictive factor signal signal interference ratio component is greater than the setting thresholding in sef-adapting filter and/or the frequency domain trapper;
When factor k=0, described first signal equals to receive signal; Comprise the frequency domain trapper in the described device;
When factor k=1, described first signal equals described reception signal and deducts described predictive factor signal, and self-adaptive filters in time area device module is connected with frequency domain trapper module in the described device;
Factor k satisfies: described first signal signal interference ratio component is greater than the setting thresholding in sef-adapting filter and/or the frequency domain trapper.
10. the Suppression of narrow band interference device in the spread spectrum system as claimed in claim 7 is characterized in that, is provided with an analog to digital converter at receiving terminal, and the analog signal sampling of receiving terminal is obtained receiving the signal discrete sequence.
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| CN104502925A (en) * | 2015-01-22 | 2015-04-08 | 西安航天华迅科技有限公司 | Narrowband interference resisting system and method based on adaptive signal processing |
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| CN108957419A (en) * | 2018-05-31 | 2018-12-07 | 西安电子科技大学 | Asynchronous interference suppressing method based on notch filter processing |
| CN108957419B (en) * | 2018-05-31 | 2022-08-19 | 西安电子科技大学 | Asynchronous interference suppression method based on notch filtering processing |
| CN112422151A (en) * | 2018-12-28 | 2021-02-26 | 长沙天仪空间科技研究院有限公司 | Communication satellite |
| CN111698022A (en) * | 2019-01-03 | 2020-09-22 | 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 |
| 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 |
| 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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| 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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| CN115604066B (en) * | 2022-10-08 | 2024-05-03 | 杭州万高科技股份有限公司 | Low-cost narrowband interference frequency estimation method based on discrete Fourier transform |
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