CN103248395A - Narrow-band interference suppression method and device - Google Patents
Narrow-band interference suppression method and device Download PDFInfo
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- CN103248395A CN103248395A CN2012100282390A CN201210028239A CN103248395A CN 103248395 A CN103248395 A CN 103248395A CN 2012100282390 A CN2012100282390 A CN 2012100282390A CN 201210028239 A CN201210028239 A CN 201210028239A CN 103248395 A CN103248395 A CN 103248395A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/71—Interference-related aspects the interference being narrowband interference
- H04B1/7102—Interference-related aspects the interference being narrowband interference with transform to frequency domain
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Abstract
The invention discloses a narrow-band interference suppression method and device. The method comprises the following steps: sampling input digital signals; converting the obtained digital signals into frequency-domain signals; obtaining the interference testing result according to the frequency-domain signals; configuring a filter unit according to the interference testing result; and performing interference suppression for the input digital signals through the filter unit. Due to the adoption of the technical scheme, the problems that a narrow-band interference suppression algorithm is complex and difficult to realize in the prior art are solved.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of narrow-band interference rejection method and device.
Background technology
In 3-G (Generation Three mobile communication system), directly expand CDMA (Code Division Multiple Addressing, code division multiple access) system and obtained using widely.Straight expand cdma system by pseudo noise code with the frequency spectrum of data sequence directly expand to one than demand wide on the bandwidth spectrum of Duo, this processing mode by spread-spectrum makes straight expansion cdma system have Suppression of narrow band interference ability to a certain degree.But, in the practical application, the straight signal transmission power that expands cdma system is limited (this point is particularly outstanding in miniaturization base stations such as pico and femeto), when the narrow-band interference signal in the external world is enough strong, the normal demodulation performance of community user will be worsened, reduce cell capacity and coverage, also can cause the residential quarter choking phenomenon when serious.Therefore how suppressing the arrowband interference in limited frequency spectrum resources is a very important problem.
Suppression of narrow band interference device of the prior art mainly be divided into time domain based on the Suppression of narrow band interference device of adaptive-filtering and the Suppression of narrow band interference device based on the frequency spectrum conversion process of frequency domain.Wherein the basic principle based on the Suppression of narrow band interference device of adaptive-filtering of time domain is, utilize to disturb and the statistical property of the spread-spectrum signal that receives different, the employing adaptive algorithm is predicted interference and is estimated, the interference of estimating is eliminated from resultant signal, thereby reached the purpose that suppresses interference.The basic principle based on the Suppression of narrow band interference device of frequency spectrum conversion of frequency domain is, adopt FFT (fast Fourier transform) to calculate the spectral characteristic of the signal that receives, in frequency spectrum, search and disturb the frequency that occurs, and this frequency handled accordingly, thereby reduce the influence of disturbing in receiving signal.
Suppression of narrow band interference device of the prior art needs that all signal is carried out FFT and transforms to frequency domain, obtain its spectrum signature then, on frequency domain signal being carried out filtering according to spectrum signature handles, contravariant is changed to time-domain signal to frequency-region signal after at last filtering being handled through FFT, the weak point that exists: need realize FFT conversion and FFT inverse transformation algorithm simultaneously, and carry out this process that filtering is handled according to spectrum signature at frequency domain, more complicated realizes that difficulty is bigger.
Summary of the invention
The invention provides a kind of narrow-band interference rejection method and device, solve Suppression of narrow band interference algorithm complexity in the prior art, realize the big problem of difficulty.
For solving the problems of the technologies described above, the present invention takes following technical scheme.
A kind of narrow-band interference rejection method comprises:
Digital signal to input is sampled; The digital signal conversion that sampling is obtained is frequency-region signal; Obtain interference detection results according to described frequency-region signal; According to described interference detection results configuration filter cell; Utilize described filter cell that the digital signal of input is disturbed inhibition.
In an embodiment of the present invention, this filter cell comprises the notch filter of one or more groups cascade.
In an embodiment of the present invention, the method according to described interference detection results configuration filter cell is specially: according to the default filter coefficient table of described interference detection results inquiry; Coefficient configuration filter cell according to the required configuration of filter that checks in.
In an embodiment of the present invention, this digital signal conversion that sampling is obtained is frequency-region signal method is specially: the digital signal conversion of adopting fast Fourier transform that sampling is obtained is frequency-region signal.
Whether in an embodiment of the present invention, the method that obtains interference detection results according to described frequency-region signal is specially: the mould to described frequency-region signal carries out the filtering processing, detect to exist the arrowband to disturb; If exist, then obtain the characteristic information that the arrowband disturbs, the characteristic information that described arrowband disturbs is described interference detection results.
In an embodiment of the present invention, the characteristic information of described arrowband interference comprises interfering frequency and jamming bandwidth.
In an embodiment of the present invention, described filter coefficient table is preserved the incidence relation of the coefficient of interfering frequency, jamming bandwidth and the required configuration of filter.
A kind of Suppression of narrow band interference device comprise sampling unit, the time/frequency converter unit, Interference Detection unit, dispensing unit and filter cell, wherein, described sampling unit is used for the digital signal of input is sampled; When described/converter unit is frequency-region signal for the digital signal conversion that described sampling unit sampling is obtained frequently; Described Interference Detection unit is used for when described/and frequency-region signal after the conversion of frequency converter unit obtains interference detection results; The interference detection results that described dispensing unit is used for obtaining according to described Interference Detection unit disposes filter cell; Described filter cell is used for the digital signal of input is disturbed inhibition.
In an embodiment of the present invention, this filter cell comprises the notch filter of one or more groups cascade.
In an embodiment of the present invention, this dispensing unit is inquired about default filter coefficient table according to the interference detection results that described Interference Detection unit obtains; Coefficient configuration filter cell according to the required configuration of filter that checks in.
In an embodiment of the present invention, this Interference Detection unit is used for when described/and the mould of frequency-region signal after the conversion of frequency converter unit carries out filtering to be handled, and detects whether there is the arrowband interference; If exist, then obtain the characteristic information that the arrowband disturbs, the characteristic information that described arrowband disturbs is described interference detection results.
The invention provides a kind of narrow-band interference rejection method and device, the present invention is frequency-region signal in the digital signal conversion that sampling is obtained, frequency-region signal is carried out after the Interference Detection, employing is disposed filter cell according to interference detection results, utilize filter cell the digital signal of input to be disturbed the mode of inhibition, do not need as the process of prior art according to spectrum signature filtering on frequency domain, simultaneously, also do not need again frequency-region signal to be transformed to time-domain signal through the mode of inverse transformation.Have and realize advantages such as simple, that difficulty is low, reliable, real-time is good.
Description of drawings
The schematic diagram of the receiver of the Suppression of narrow band interference device that is provided with one embodiment of the invention and provides is provided Fig. 1;
The Suppression of narrow band interference schematic representation of apparatus that Fig. 2 provides for one embodiment of the invention;
The structural representation of the filter coefficient table that Fig. 3 provides for one embodiment of the invention;
The flow chart of the narrow-band interference rejection method that Fig. 4 provides for one embodiment of the invention.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
Suppression of narrow band interference device provided by the invention is positioned at after the Digital IF Processing, before base band demodulating is handled, the base station receiver of the Suppression of narrow band interference device that is provided with one embodiment of the invention and provides is provided Fig. 1, this receiver comprises successively reverse receiving element 11, Digital IF Processing unit 12, Suppression of narrow band interference device 13 and the base band demodulating processing unit 14 that links to each other, and Suppression of narrow band interference device 13 is connected between the input of the output of Digital IF Processing unit 12 and base band demodulating processing unit 14.By 13 pairs of processing of disturbing digital signal of this Suppression of narrow band interference device, can effectively strengthen the performance that the anti-arrowband of receiver disturbs.
Core of the present invention is by conversion obtains the real-time detection of the arrowband interference characteristic of frequency-region signal to sampled digital signal, then according to interference detection results configuration filter cell, utilize the filter cell after disposing that the digital signal of input is disturbed inhibition, thereby reach disturbing the processing of digital signal, finally realize system's antijamming capability.
Fig. 2 is the Suppression of narrow band interference device that one embodiment of the invention provides, comprise sampling unit 21, the time/frequency converter unit 22, Interference Detection unit 23, dispensing unit 24 and filter cell 25.
The time/frequency converter unit 22 is used for this N data point that sampling unit 21 samplings obtain is carried out fast Fourier transform, is transformed to frequency-region signal.
During 23 pairs of Interference Detection unit/this frequency-region signal of obtaining after 22 conversion of frequency converter unit carries out modulo operation, obtain the mould of frequency-region signal, mould to this frequency-region signal carries out the filtering processing again, detect and whether exist the arrowband to disturb, if exist, then obtain characteristic informations such as the interfering frequency disturbed by the arrowband and jamming bandwidth, the characteristic information that this arrowband disturbs is the interference detection results of Interference Detection unit 23, dispensing unit 24 is configured filter cell according to this interference detection results, can report this interference detection results to give base station processor simultaneously.
25 pairs of time-domain signals of filter cell carry out filtering, play the interference inhibit feature to time-domain signal, the notch filter that can comprise one or more groups cascade, notch filter such as Notch filter, its default conditions are Bypass (not gating) state, the baseband digital signal of 25 pairs of inputs of filter cell this moment does not carry out filtering, directly exports to base band demodulating and handles.The filter coefficient table of storing in the interfering frequency that dispensing unit 24 obtains according to Interference Detection unit 23 and the jamming bandwidth consults memory, obtain the coefficient of the required configuration of corresponding filter, dispensing unit 24 is automatic or manual to be configured to this coefficient in the corresponding coefficient register of filter cell 25, be operating state with the Bypass Status Change then, this moment, filter cell 25 began the baseband digital signal of input is disturbed inhibition.After the arrowband of interference signal interference characteristic information changed, dispensing unit 24 sent one group of new coefficient to give filter cell 25 again, and the filter register that only need to upgrade filter cell 25 this moment just can disturb inhibition to new interference signal.
The structure of the filter coefficient table that Fig. 3 provides for one embodiment of the invention, this filter coefficient table is preserved the incidence relation of the coefficient of interfering frequency, jamming bandwidth and the required configuration of filter.Thereby shorten and to table look-up the time in order to reduce in the table data volume.Suppose that the base-band signal spectrum bandwidth is B, electing the jamming bandwidth value as spectral bandwidth is the N five equilibrium, namely jamming bandwidth may be selected to be B/N, 2B/N ..., B.When jamming bandwidth is chosen as B/N, interfering frequency may be selected to be-(2N-1) * B/ (2N) ... ,-3*B/ (2N) ,-1*B/ (2N), 0, B/2N, 3*B/2N ..., (2N-1) * B/ (2N); When jamming bandwidth was chosen as 2B/N, interfering frequency may be selected to be-(N-1) * B/ (N) ... ,-3*B/ (N) ,-1*B/ (N), 0, B/N, 3*B/N ..., (N-1) * B/ (N); By that analogy, when jamming bandwidth was chosen as B, interfering frequency only may be selected to be 0; Calculate corresponding filter coefficient by simulated program at various bandwidth and interfering frequency situation again, generate this filter coefficient table, this filter coefficient table can be stored in the memory.When tabling look-up, can in the sublist of correspondence, inquire about according to interfering frequency then earlier according to the jamming bandwidth inquiry, obtain the coefficient that finally need dispose.
Suppression of narrow band interference device provided by the invention can be integrated in FPGA, ASICs, High Performance DSP device or other processor and realize.
The invention provides a kind of narrow-band interference rejection method based on this Suppression of narrow band interference device, Fig. 4 has provided the flow chart of the method for the invention.
S401, sampling unit 21 be N data point of sampling (N is that 2 power is inferior, may be selected to be 512,1024 etc.) from the digital signal of input.
S402, the time/this N data point that 22 pairs of samplings of frequency converter unit obtain carries out fast Fourier transform, is transformed to frequency-region signal.
S403,23 pairs of these frequency-region signals in Interference Detection unit carry out modulo operation, obtain the mould of frequency-region signal, mould to this frequency-region signal carries out the filtering processing again, detect and whether exist the arrowband to disturb, if exist, show that then need carry out filtering handles, and enters step S404, otherwise expression does not need to carry out filtering to be handled, and enters step S405.
S404, obtain characteristic informations such as interfering frequency and jamming bandwidth, as the usefulness of tabling look-up in the subsequent step, the characteristic information that this arrowband disturbs is the interference detection results of Interference Detection unit 23, also can report this interference detection results to give base station processor simultaneously.
S405, currently not having an interference, is Bypass (not gating) state by dispensing unit 24 automatic or manual configuration filter cells 25, makes the digital signal of input filter unit 25 directly deliver to the output of filter cell 25.Return step S401.
S406: dispensing unit 24 is tabled look-up according to interfering frequency and jamming bandwidth that step S404 provides, and this filter coefficient table as shown in Figure 3.Earlier inquire corresponding sublist according to jamming bandwidth, and then inquire about the coefficient that obtains current filter cell 25 required configurations according to interfering frequency.
S407, by the coefficient of dispensing unit 24 automatic or manual configuration filter cells 25, and be operating state with the pattern configurations of filter cell 25, this moment, filter cell 25 began the baseband digital signal of input is disturbed inhibition, returned step S401.
Present embodiment carries out fast Fourier transform with the digital signal that sampling obtains, be transformed to frequency-region signal, the mould of getting this frequency-region signal carries out filtering to be handled, detect and whether exist the arrowband to disturb, if exist, then record characteristic informations such as interfering frequency and jamming bandwidth, table look-up according to characteristic informations such as interfering frequency and jamming bandwidths, obtain the coefficient of the required configuration of current filter cell, according to this coefficient filter cell is carried out the coefficient configuration, and be operating state with the pattern configurations of filter cell, utilize filter cell that the digital signal of input is disturbed inhibition at last.Do not need as the process of prior art according to spectrum signature filtering on frequency domain, simultaneously, also do not need again frequency-region signal to be transformed to time-domain signal through the mode of inverse transformation.Have and realize advantages such as simple, that difficulty is low, reliable, real-time is good.
Above content be in conjunction with concrete execution mode to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (11)
1. a narrow-band interference rejection method is characterized in that, comprising:
Digital signal to input is sampled;
The digital signal conversion that sampling is obtained is frequency-region signal;
Obtain interference detection results according to described frequency-region signal;
According to described interference detection results configuration filter cell;
Utilize described filter cell that the digital signal of input is disturbed inhibition.
2. narrow-band interference rejection method as claimed in claim 1 is characterized in that, described filter cell comprises the notch filter of one or more groups cascade.
3. narrow-band interference rejection method as claimed in claim 1 or 2 is characterized in that, the method that disposes filter cell according to described interference detection results is specially:
According to the default filter coefficient table of described interference detection results inquiry;
Coefficient configuration filter cell according to the required configuration of filter that checks in.
4. narrow-band interference rejection method as claimed in claim 3 is characterized in that, the digital signal conversion that sampling is obtained is that the method for frequency-region signal is specially: the digital signal conversion of adopting fast Fourier transform that sampling is obtained is frequency-region signal.
5. whether narrow-band interference rejection method as claimed in claim 3 is characterized in that, the method that obtains interference detection results according to described frequency-region signal is specially: the mould to described frequency-region signal carries out the filtering processing, detect to exist the arrowband to disturb; If exist, then obtain the characteristic information that the arrowband disturbs, the characteristic information that described arrowband disturbs is described interference detection results.
6. narrow-band interference rejection method as claimed in claim 5 is characterized in that, the characteristic information that described arrowband disturbs comprises interfering frequency and jamming bandwidth.
7. narrow-band interference rejection method as claimed in claim 6 is characterized in that, described filter coefficient table is preserved the incidence relation of the coefficient of interfering frequency, jamming bandwidth and the required configuration of filter.
8. a Suppression of narrow band interference device is characterized in that, comprise sampling unit, the time/frequency converter unit, Interference Detection unit, dispensing unit and filter cell, wherein,
Described sampling unit is used for the digital signal of input is sampled;
When described/converter unit is frequency-region signal for the digital signal conversion that described sampling unit sampling is obtained frequently;
Described Interference Detection unit is used for when described/and frequency-region signal after the conversion of frequency converter unit obtains interference detection results;
The interference detection results that described dispensing unit is used for obtaining according to described Interference Detection unit disposes filter cell;
Described filter cell is used for the digital signal of input is disturbed inhibition.
9. Suppression of narrow band interference device as claimed in claim 8 is characterized in that, described filter cell comprises the notch filter of one or more groups cascade.
10. Suppression of narrow band interference device as claimed in claim 8 or 9 is characterized in that, the default filter coefficient table of interference detection results inquiry that described dispensing unit obtains according to described Interference Detection unit; Coefficient configuration filter cell according to the required configuration of filter that checks in.
11. Suppression of narrow band interference device as claimed in claim 10, described Interference Detection unit be used for when described/and the mould of frequency-region signal after the conversion of frequency converter unit carries out filtering to be handled, and detects whether there is the arrowband interference; If exist, then obtain the characteristic information that the arrowband disturbs, the characteristic information that described arrowband disturbs is described interference detection results.
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| CN2012100282390A CN103248395A (en) | 2012-02-09 | 2012-02-09 | Narrow-band interference suppression method and device |
| PCT/CN2012/073406 WO2013117035A1 (en) | 2012-02-09 | 2012-03-31 | Narrowband interference suppression method and device |
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| CN104361892A (en) * | 2014-09-18 | 2015-02-18 | 电子科技大学 | Method for recognizing narrow-band interference with aliasing of interference signals and voice modulation signals |
| CN110493860A (en) * | 2018-05-14 | 2019-11-22 | 海能达通信股份有限公司 | A kind of method of multi-mode communication, mobile terminal and storage medium |
| CN110995201A (en) * | 2019-10-14 | 2020-04-10 | 珠海格力电器股份有限公司 | Force sensor filtering method and system, force sensor and robot |
| WO2021227039A1 (en) * | 2020-05-15 | 2021-11-18 | 华为技术有限公司 | Method for isolating narrowband interference and communication apparatus |
| CN118041393A (en) * | 2024-04-11 | 2024-05-14 | 高拓讯达(北京)微电子股份有限公司 | Method and device for suppressing narrow-band interference signals, electronic equipment and storage medium |
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| CN104361892A (en) * | 2014-09-18 | 2015-02-18 | 电子科技大学 | Method for recognizing narrow-band interference with aliasing of interference signals and voice modulation signals |
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Application publication date: 20130814 |