CN101098396A - Method and apparatus for eliminating signal interference - Google Patents
Method and apparatus for eliminating signal interference Download PDFInfo
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- CN101098396A CN101098396A CNA2006100283504A CN200610028350A CN101098396A CN 101098396 A CN101098396 A CN 101098396A CN A2006100283504 A CNA2006100283504 A CN A2006100283504A CN 200610028350 A CN200610028350 A CN 200610028350A CN 101098396 A CN101098396 A CN 101098396A
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Abstract
The invention provides a device of eliminating interference of signal, comprising an interference checker for converting signal into frequency domain to check interference of signal, and check the interference position at frequency domain, a frequency spectrum transfer device for transferring the interference position at frequency domain to zero frequency to transfer the frequency spectrum of signal at initial position to generate an upper transfer signal, a high-pass filter for filtering out the checked interference from the upper transfer signal to generate a filtered signal, and a frequency spectrum lower transfer device for transferring the frequency spectrum of the filtered signal back to initial position to generate a signal without interface. The invention can find and filter interference position, therefore, balancer can work at ideal condition, to improve system property, which can eliminate fixed interference and treat some additional unknown single-frequency interference, with wide application, low demand on hardware resource, and easy application. The invention also provides a method for eliminating interference.
Description
Technical field
The invention belongs to digital signal transmission field,, especially realize Anti-Jamming Technique in the digital terrestrial television transmission system particularly how in communication system.
Background technology
1. digital terrestrial television transmission system (comprising U.S., Europe, Japanese system),
The Digital Television Terrestrial Broadcasting technology mainly can be divided into two big classes: a class is based on single-carrier technology, and it is mainly represented is advanced television system committee (ATSC) system of the U.S.; An other class is based on multi-transceiver technology, and it is mainly represented is digital video broadcasting-ground (DVB-T) system in Europe and floor synthetic service digits broadcasting (ISDB-T) system of Japan.
The generation of 2 anolog TV signals and transmission
Simulated television transmits with vestigial sideband amplitudemodulation (AM-VSB) mode frequency division multiplexing.Its feature is that clear and definite carrier frequency is arranged.It is f that television image signal is modulated onto frequency
1On the carrier wave of Mhz, in order to avoid the main energy area of image graph image signal, within the 8Mhz bandwidth, audio signal is modulated onto frequency and is about (f again
1+ 6) on the carrier wave of Mhz.The AM-VSB signal is carried out spectrum analysis, and in each 8Mhz bandwidth, promptly in channel, concentration of energy is distributed on the vision carrier frequency (the part sideband suppresses, suppressed carrier not, this is different with balanced amplitude modulation).There is suitable Energy distribution (being bunch shape distributes) on the vision carrier frequency both sides, the existence of representative image particularly to high frequency direction.At (f
1+ 4) there is a peak of beating at the Mhz place, and this is the position at colour subcarrier place, changes with the difference of pattern colour saturation.At (f
1+ 6) Mhz place is the peak of sound subcarrier.
The generation of 3 digital television signals and transmission
Digital television signal adopts the modulation system that is different from simulated television.It at first combines to high frequency carrier both amplitude modulation or phase modulation or amplitude modulation the mpeg 2 transport stream of having finished chnnel coding with phase modulation.Amplitude modulation is again balanced amplitude modulation, has suppressed carrier wave.Thereby from spectrum analyzer, the modulated signal of a digital channel resembles a noise platform of having raised, and is tiled in uniformly within the whole bandwidth, in the bandwidth of whole qualification is flat-top, and no peak can be sayed.Its energy is evenly distributed in the whole qualification bandwidth.When audio signal is encoded at MPEG-2, together multiplexing with the form of bag with picture signal.Thereby a digital TV channel does not only have so-called image carrier, does not have sound carrier yet.
4 eliminate the necessity of simulated television co-channel interference
From above-mentioned 2,3 two can it is evident that, when digital television signal and anolog TV signals transmit in same frequency range, anolog TV signals are superimposed upon on the digital signal, the frequency spectrum that makes digital television receiver receive signal is no longer calmed down no peak in the bandwidth range that limits, but 3 peaks (wherein 1 meeting is beated) of appearance.As not eliminating, can influence follow-up signal processing (as: equilibrium, decoding), reduce whole receiver performance.Although the digital TV ground transmission standard of China is about to release, in several years even the more than ten years in future, in decades, simulated television and Digital Television will coexist, need so eliminate co-channel interference, and also be necessary.In addition, in the Digital Television bandwidth, also exist some unusual simple signal to disturb, also need further elimination.
5 tradition are eliminated the method for simulated television co-channel interference
With U.S. ATSC system is example, and this system adopts the zero-frequency interference of comb filter in order to the antagonism simulated television at receiving terminal.The block diagram of comb filter is as shown in Figure 8: comb filter 802 is made up of feedforward delay cell 804 and adder 806, and wherein this comb filter 802 is the linear feedforward filters of single tap.This filter 802 generally is positioned over and is used to separate after the system that is transferred to base band, sends into (all not shown) before the equalizer.
Fig. 9 shows comb filter 802 spectral responses in U.S. ATSC system.It is 57 * f that comb filter 802 produces an equispaced
hPeriodicity pit (896.8kkHz), wherein f
hHorizontal line rate for (U.S.) national television standards committee (NTSC) standard.Therefore as shown in Figure 9, have 7 pits in the ATSC6Mhz bandwidth, make the image carrier V of NTSC accurately fall into 2.1kHz place before second pit, chrominance carrier C falls near the 6th pit, and sound carrier falls into 13.6kHz place behind the 7th pit.
Though comb filter is widely used in the television transmission field, this method still exists some limitation.At first it can only play inhibitory action to the interference of fixing frequency, even under the situation of the co-channel interference of dealing with known NTSC, also have only chrominance carrier C to fall into fully in the pit that comb filter produces thereby can be by complete elimination, the position of picture-and-sound carrier wave and pit all have deviation.In addition, when eliminating the ad-hoc location interference,, therefore the useful data that is positioned at the pit respective frequencies has been produced influence owing to introduced other pit.And these influences may need extra chnnel coding to compensate, and have increased hardware complexity.At last, owing to used feedforward delay cell 804 to realize feedforward filtering, the noise of final output is original noise and adding up through the noise after the delay cell.Can make signal to noise ratio decline 3.5dB under additive white Gaussian noise (AWGN) channel generally speaking, so this method is applicable to relatively under the signal to noise ratio condition with higher.
Improvement system based on comb filter is also arranged afterwards, for example by judging whether to exist the simulation co-channel interference to select whether to open comb filter, but owing to often be subjected to the interference of channels such as multipath and impulsive noise, cause erroneous judgement easily, cause unstable properties on the contrary.Also having a kind of way is to adopt such filter, and it only pit occurs near the known disturbances frequency; Or be to move the position that occurs disturbing to a certain characteristic frequency, carry out filtering with fixing filter.More than two kinds of ways all only be defined in the situation of the frequency location of determining known disturbances, in fact can't resist the strong single-frequency that changes at any time in the real channel and disturb.
Therefore, the method and apparatus that disturbs in a kind of effective erasure signal of this area needs.
Summary of the invention
The objective of the invention is to be that communication system, especially digital television ground broadcast transmission system provide a kind of simple, eliminate the method and apparatus that disturbs reliably.The position that wherein can determine to disturb (for example the image carrier in the digital television ground broadcast transmission system received signal disturbs and sound carrier disturbs or the strong single-frequency of some the unknowns is disturbed) is in addition filtering also.In addition, remedy the damage of elimination interference, make that the power of eliminating the signal that disturbs front and back is basic identical signal power by automatic gain control (AGC) module.In the signal input equalizer, make equalizer be operated in the ideal environment afterwards, systematic function is improved.
According to the present invention, a kind of equipment of disturbing in the digital terrestrial television transmission system erasure signal of being used for is provided, comprise: interference detecting apparatus is used for by described signal transformation is detected the frequency domain position of interference and detected interference from described signal to frequency domain; Filtting device on the frequency spectrum, with the coupling of described interference detecting apparatus, the frequency spectrum that is used for moving from the home position by the frequency domain position of described interference is moved the zero frequency place described signal is moved signal to produce; High pass filter is used for moving the described interference of the detected interference of signal filtering to produce the signal of filtering from described; And Filtting device under the frequency spectrum, be used for frequency spectrum shift with the signal of described filtering and go back to described home position and eliminated interference signals to produce.
According to the present invention, a kind of equipment that is used for a plurality of interference of erasure signal also is provided, comprising: interference detecting apparatus is used for by described signal transformation is detected the frequency domain position of a plurality of interference and detected a plurality of interference from described signal to frequency domain; And the interference blanking unit of a plurality of serial connections, be used for eliminating detected a plurality of interference according to detected frequency domain position of disturbing a plurality of interference respectively, wherein, each interference blanking unit comprises: Filtting device on the frequency spectrum, and the frequency spectrum that is used for moving from the home position by one frequency domain position of detected a plurality of interference is moved the zero frequency place described signal is moved signal to produce; High pass filter is used for a signal with generation filtering of moving the detected a plurality of interference of signal filtering from described; And Filtting device under the frequency spectrum, be used for the frequency spectrum shift of the signal of described filtering is gone back to described home position to produce the input of output signal as Filtting device on the frequency spectrum of next interference blanking unit of interference blanking unit of a plurality of serial connections, wherein, the output signal that Filtting device produces under the frequency spectrum of last interference blanking unit in the interference blanking unit of a plurality of serial connections is as final output signal.
According to the present invention, a kind of method that erasure signal disturbs that is used for also is provided, may further comprise the steps: a) by described signal transformation is detected the frequency domain position of interference and detected interference from described signal to frequency domain; B) frequency spectrum of moving described signal by the frequency domain position of described interference is moved the zero frequency place from the home position is moved signal to produce; C) move the detected interference of filtering the signal to produce the signal of filtering from described; And d) frequency spectrum shift of the signal of described filtering is gone back to described home position and eliminated interference signals to produce.
According to the present invention, a kind of method that is used for a plurality of interference of erasure signal also is provided, may further comprise the steps: a) by described signal transformation is detected the frequency domain position of a plurality of interference and detected a plurality of interference from described signal to frequency domain; B) frequency spectrum of moving described signal by one frequency domain position in detected a plurality of interference is moved the zero frequency place from the home position is moved signal to produce; C) move in the detected a plurality of interference of filtering the signal to produce the signal of filtering from described; D) frequency spectrum shift of the signal of described filtering is gone back to described home position and eliminated interference signals to produce; And e) repeating step b)-d) up to eliminating detected a plurality of interference to produce final output signal.
The present invention is by to carrying out filtering at the position of determining after the Interference Detection, not only can eliminate fixing interference (as NTSC simulation co-channel interference), also can do with some extra unknown single-frequency disturbs, it is filtering interfering targetedly, adapts to wide, and less demanding to hardware resource, realize easily, hardware configuration is simple, saves resource, robust.
Description of drawings
Further describe the present invention below in conjunction with drawings and Examples.
Fig. 1 illustrates the structured flowchart of eliminating the equipment that disturbs according to embodiments of the invention;
Fig. 2 illustrates the structured flowchart of interference detecting apparatus among Fig. 1 according to embodiments of the invention;
Fig. 3 illustrates the structured flowchart of interference blanking unit among Fig. 1 according to embodiments of the invention;
Fig. 4 illustrates the detailed structure view of the equipment of eliminating a plurality of interference according to one embodiment of present invention;
Fig. 5 illustrates the flow chart of interference elimination method according to embodiments of the invention;
Fig. 6 illustrates the sub-process figure of Interference Detection step among Fig. 5 according to embodiments of the invention;
Fig. 7 illustrates the sub-process figure of interference eliminated step among Fig. 5 according to embodiments of the invention;
Fig. 8 shows the block diagram that is used for the comb filter that erasure signal disturbs in the prior art;
Fig. 9 shows the spectral response of comb filter among Fig. 8.
Embodiment
Below by being that example provides following examples in conjunction with content of the present invention with the digital tv ground broadcasting, it comprises single-carrier system (as ATSC system and China advanced digital television terrestrial broadcasting (ADTB-T) system of the U.S.), and multicarrier system (as the DVB-T system in Europe and DMB (DMB-T) system of China).Those skilled in the art will appreciate that the present invention also can be applicable in other communication systems, as wireless communication system and digital communication system in.
As shown in Figure 1, show the The general frame of eliminating the equipment 100 that disturbs according to embodiments of the invention.It comprises interference detecting apparatus 120, interference blanking unit 140 and AGC module 160, wherein interference detecting apparatus 120 is used for detecting to frequency domain by the signal transformation that will receive the frequency domain position (if any) of the interference and the interference of this signal, below can be described in detail according to Fig. 2.Interference blanking unit 140 is eliminated according to this frequency domain position and is to disturb detected interference in the checkout gear 120, below can be described in detail according to Fig. 3.Since eliminated disturb after, the amplitude of signal can reduce, thus available AGC module 160 come adaptively the power of output signal to be improved, be stabilized at last reference power value near.
Following detailed diagram according to the interference detecting apparatus shown in Fig. 2 120 is described the process of disturbing that detects.As shown in Figure 2, interference detecting apparatus 120 comprises: frequency domain transform device 122, peak detection block 124, adding up device 126, sine and cosine look-up table device 128.Frequency domain transform device 122 is transformed to frequency-region signal with received signal.Because these disturb and show as the very big peak of amplitude on frequency domains, thus can be by input signal be done frequency domain transform, time-domain signal is transformed into the frequency domain analyzing and processing that gets on.Be input to peak detection block 124 from the signal of frequency domain transform device 122 outputs, thereby the peak value of the magnitude squared value of detection frequency-region signal is to produce and peak value frequency points corresponding position signalling in bandwidth.Subsequently, adding up device 126 is accumulated as phase signal with described frequency position signalling.In one embodiment, adding up device 126 is realized by the combination of delayer and accumulator, wherein by adding up of frequency position signalling and its delay form produced phase signal.Certainly, can also use other modes to realize this adding up device.At last, sine and cosine look-up table device 126 produces the frequency domain position of corresponding sine and cosine value as the interference of interference detecting apparatus 120 generations according to phase signal.
In one embodiment, in order to improve the accuracy of detection, peak detector 120 can comprise the comparison means (not shown), its institute's peak value that detects and predetermined threshold are made comparisons, if peak value is greater than this threshold value then think interference that need to eliminate, otherwise think the interference that general interchannel noise causes, thereby do not need to eliminate.According to comparative result, this comparison means produces corresponding enable signal subsequently.Particularly, when peak value during greater than threshold value, enable signal is for enabling signal, otherwise then is disables.It may occur to persons skilled in the art that this comparison means also can be positioned outside the peak detector 120, this does not influence operation wherein.The effect of this enable signal continues to be described below with reference to Fig. 3.
It should be noted that, because the randomness of signal and frequency domain transform exist intrinsic computational accuracy error (as adopting 2048 fast Fourier transform (FFT), under the 15M clock, minimum frequency resolution is 7, about 3kHz), may have bigger error so detect according to the result of single frequency domain transform.Therefore, the fast fourier transform that can adopt height to count improves precision.Optionally, adopt repeatedly frequency domain transform result's mean value to come the position of detection peak to increase the confidence level of judgement.With the data after average as the frequency position signalling, thereby can improve the stability and the accuracy of testing result.
It will be appreciated by those skilled in the art that, more than the testing process of shown interference only be illustrative rather than restrictive, the present invention also can adopt other interference frequency domain detection process, as long as produce frequency domain position corresponding to detected interference, can be as frequency position, phase place, spectrum information etc. as the information of expression frequency domain position.In addition, can adopt any frequency domain transform mode well known in the art in the frequency domain transform device 122, for example discrete Fourier transform (DFT).Those skilled in the art can select different fast fourier transform of counting (as 1024 points according to required precision in addition, 2048 points, 4196 points), also can require to select non real-time or non real-time fast fourier transform, perhaps use common discrete Fourier transform (DFT) according to hardware complexity.
Following detailed diagram according to the interference blanking unit shown in Fig. 3 140 is described the process of disturbing of eliminating.As shown in Figure 3, interference blanking unit 140 comprises Filtting device 146 under Filtting device 142 on the frequency spectrum, high pass filter 144 and the frequency spectrum.Filtting device 142 is moved the zero frequency place to the frequency domain position that disturbs according to the sine and the cosine value of sine and cosine look-up table device 126 output on the frequency spectrum, and the frequency spectrum of moving received signal from the home position is moved signal to produce.High pass filter 144 is moved filtering interfering the signal to produce the signal of filtering from this.
And Filtting device 146 goes back to the frequency spectrum shift of the signal of filtering to the home position and has eliminated interference signals to produce under the frequency spectrum.This signal is input to AGC module 160 subsequently.
If interference detecting apparatus 120 comprises comparison means, then can be divided into two kinds of situations: if the enable signal of its generation then starts high pass filter 144, interference filtering for enabling signal.If this enable signal is a disables, the high pass filter 144 of then stopping using, on to move signal in the past straight-through, actual result only is to mix corresponding delay.
In one embodiment, high pass filter 146 is single order infinite impulse response (IIR) filters.It will be appreciated by those skilled in the art that, can select other high pass filter (as second order iir filter, finite impulse response (FIR) filter etc.) according to actual conditions, and regulate the coefficient of this filter, make its bandwidth and the outer supression of band all satisfy the requirement of filtering interfering.
Application of the present invention when being a plurality of interference of example detailed description elimination to detect and to eliminate two interference below in conjunction with accompanying drawing 4.Fig. 4 shows the detailed structure view of present device 400 according to one embodiment of present invention.
As shown in Figure 4, this equipment 400 comprises as shown in Figure 2 interference detecting apparatus 120 and two interference blanking unit 140A and 140B as shown in Figure 3.In the operation, band interference signals din_real and din_imag (expression comprises the real part and the imaginary part of signal) enter frequency domain transform device 122.It is transformed to received signal frequency-region signal and produces frequency-region signal.This signal is input to peak detection block 124, two peak values of the magnitude squared value by detecting bandwidth frequency domain signal, and two frequency position signalling bin1 of output peak-peak and second largest peak value correspondence and bin2.Be similar to the description among above Fig. 2 in addition, peak detection block 124 also can comprise comparison means, its this two peak values are made comparisons with two predetermined thresholds respectively, thereby export two enable signal rem_ena1 and rem_ena2 that act on high pass filter 144A and 144B respectively.These two frequency position signalling bin1 and bin2 carry out producing from adding up two phase signal phase1 and phase2 by the included delayer D1 of adding up device 126 and D2 and accumulator 402A and 402B respectively.Phase signal phase1 and phase2 are input to sine and cosine look-up table device 128 respectively, thus produce two groups of sine and cosine values corresponding respectively to two interference (cos1, sin1) and (cos2 sin2) represents the frequency domain position of these two interference.They are input to respectively on the frequency spectrum of two interference blanking unit 140A and 140B and are moved among module 142A and the 142B.
Move module 142A on the frequency spectrum according to the one group of sine and cosine value (cos1 that disturbs the interference of peak-peak (for example corresponding to) corresponding to one of them, sin1) frequency domain position of this interference is moved the zero frequency place, thereby make band interference signals din_real and din_imag move signal pos_sft_re1 and pos_sft_im1 on becoming.Move the enable signal rem_ena1 that signal pos_sft_re1 and pos_sft_im1 and peak detection block 124 are produced in the high pass filter 144A reception.Be divided into two kinds of situations this moment: if enable signal rem_ena1 for enabling signal, then starts high pass filter 144A, the image carrier interference filtering.If enable signal rem_ena1 is a disables, the high pass filter 144A that then stops using, on move signal pos_sft_re1 and pos_sft_im1 is in the past straight-through, actual result only is to mix corresponding delay.High pass filter 144A is output as the signal pos_rem_re1 and the pos_rem_im1 of filtering, moves module 146A under its input spectrum.Move module 146A under the frequency spectrum frequency spectrum of the signal pos_rem_re1 of filtering and pos_rem_im1 is moved back on the original position, thereby produce output signal pos_resft_re1 and pos_resft_im1.At this moment in this output signal, just eliminated one of them interference.
Subsequently output signal pos_resft_re1 and pos_resft_im1 are input to and move module 142B on the frequency spectrum.Similar with the process of eliminating the interference that first detected, move module 142B on the frequency spectrum according to the one group of sine and cosine value (cos2 that disturbs the interference of second largest peak value (for example corresponding to) corresponding to another, sin2) frequency domain position of this interference is moved the zero frequency place, thereby make output signal pos_resft_re1 and pos_resft_im1 move signal pos_sft_re2 and pos_sft_im2 on becoming.Move the enable signal rem_ena2 that signal pos_sft_re2 and pos_sft_im2 and peak detection block 124 are produced in the high pass filter 144B reception.Also be divided into two kinds of situations this moment: if enable signal rem_ena2 for enabling signal, then starts high pass filter 144B, this detected interference filtering.If enable signal rem_ena2 is a disables, the high pass filter 144B that then stops using, on move signal pos_sft_re1 and pos_sft_im2 is in the past straight-through, actual result only is to mix corresponding delay.High pass filter 144B is output as the signal pos_rem_re2 and the pos_rem_im2 of filtering, moves module 146B under its input spectrum.Move module 146B under the frequency spectrum frequency spectrum of the signal pos_rem_re2 of filtering and pos_rem_im2 is moved back on the original position, thereby produce final output signal pos_resft_re2 and pos_resft_im2, wherein two all filterings of interference.
At last final output signal pos_resft_re2 and pos_resft_im2 are input to AGC module 160.AGC module 160 is regulated the power of final output signal according to power reference value signal pwr_ref, make its be stabilized in reference power value near.The output toeql_re of AGC module 160 and toeql_im are admitted to equalizer and do subsequent treatment.In one embodiment, AGC module 160 is a digital AGC.
Though above embodiment has only described the elimination at two detected interference, but it will be appreciated by those skilled in the art that this embodiment is exemplary and nonrestrictive, it can expand at N to detect the elimination of disturbing, wherein peak detection block 124 detects N peak value, thereby utilizes N interference blanking unit 140 to eliminate the interference of this N peak value correspondence respectively.
Can use that interference that the present invention eliminates for example can comprise that adjacent in co-channel interference that analog digital television was waited with sowing time, signal transmission disturbs frequently and all bandwidth of signal in other strong single-frequency interference of the unwanted the unknown of institute, and comprising in the co-channel interference that image carrier disturbs, chrominance carrier disturbs and sound carrier disturbs.When for example applying the present invention to digital television ground broadcast transmission system, mainly need removal of images carrier-in-interference and sound carrier to disturb, peak-peak in then embodiment illustrated in fig. 4 is just disturbed corresponding to image carrier, and second largest peak value just disturbs corresponding to sound carrier.
In above equipment, but a plurality of peak values of interference detecting apparatus 120 one-time detection avoid offseting except the signal after one or more interference and carry out frequency domain transform again one time, so just can save ample resources.Simultaneously, as described above in reference to Figure 1, the FFT that can adopt height to count improves precision, and optionally, adopts repeatedly frequency domain transform result's mean value to improve the stability and the accuracy of testing result as the frequency position signalling.In addition, if not being single-frequency, the interference that is detected do not disturb, thereby certain bandwidth is arranged all, then preferably window with the position of detected peak value, detect additional peak value outside window, can avoid like this peak that abuts against detected peak value next door is thought another peak value and caused damaging useful signal.
In addition, in above equipment, the bandwidth of a plurality of high pass filters and the outer supression of band can be inequality, and those skilled in the art can select the parameter of each high pass filter according to actual conditions.For example, when applying the present invention to digital television ground broadcast transmission system, high pass filter 144A just is used for the removal of images carrier-in-interference, high pass filter 144B just is used to eliminate sound carrier to be disturbed, so preferable, the outer supression of the band of high pass filter 144B is littler than the outer supression of the band of high pass filter 144A, because image carrier signal interference ratio sound carrier signal disturbs approximately strong 8db-10db.In the operation, through experiment repeatedly, parameter configuration the best of following high pass filter under general environment (first order IIR filtering device): the parameter of high pass filter 144A is: a
0=1, a
1=63/64, b
0=1, b
1Be 1 the zero point of=-1 correspondence, and limit is 63/64, and bandwidth is 36.62kHz; The parameter of high pass filter 144B is: a
0=1, a
1=127/128, b
0=1, b
1=-1, be 1 corresponding zero point, and limit is 127/128, and bandwidth is 18.31kHz, a0 herein, and a1, b0, b1 represent the molecule denominator coefficients of the system function of filter, just in order to the coefficient of the difference equation of representing such filter.
In addition, those skilled in the art can understand: need select AGC module 160 step-lengths producing preferable effect suitably, if because step-length choosing excessive, AGC module 160 can be unstable, shakes very big; When step-length was too small, AGC module 160 convergence rates were slow, can not follow the tracks of the variation of amplitude at short notice.For example, step-length can be adjustable in [1/2^24,1/2^18] scope, desirable 1/2^21 of preferable step-length or 1/2^22.
As shown in Figure 5, show the flow chart of eliminating interference method 500 according to embodiments of the invention.This flow process is from step 520, wherein detects the interference in this signal and the frequency domain position (if any) of interference by the signal transformation that will receive to frequency domain, below can be described in detail according to Fig. 6.Flow process enters frame 540 subsequently, wherein eliminates detected interference in step 520, below can be described in detail according to Fig. 7.Since eliminated disturb after, the amplitude of signal can reduce, thus need come adaptively the power of output signal to be improved by step 560, be stabilized at last reference power value near.
Following detail flowchart according to step 520 among the Fig. 5 shown in Fig. 6 is described the process of disturbing that detects.As shown in Figure 6, the Interference Detection process wherein is transformed to frequency-region signal with received signal from step 522.Flow process enters step 524 subsequently, and the peak value of magnitude squared value that wherein detects frequency-region signal in bandwidth is to produce and peak value frequency points corresponding position signalling.Optionally, can adopt repeatedly frequency domain transform result's mean value to improve the stability and the accuracy of testing result as the frequency position signalling.In addition, in one embodiment, this peak value and predetermined threshold can be made comparisons, if peak value is greater than this threshold value then think interference that need to eliminate, otherwise think the interference that general interchannel noise causes and do not need to eliminate, produce corresponding enable signal according to previous comparative result.Particularly, when peak value during greater than threshold value, enable signal is for enabling signal, otherwise then is disables.The effect of this enable signal continues to be described below with reference to Fig. 7.Then, in step 526, the frequency position signalling is accumulated as phase signal.In one embodiment, by adding up of frequency position signalling and its delay form produced phase signal.At last, in step 528, produce corresponding sine and cosine value according to phase signal and represent the frequency domain position that disturbs.
Following detail flowchart according to step 540 among the Fig. 5 shown in Fig. 7 is described the process of disturbing of eliminating.As shown in Figure 7, this flow process is wherein moved the zero frequency place to the frequency domain position that disturbs according to sinusoidal and cosine value from step 542, thereby the frequency spectrum of moving received signal from the home position is moved signal to produce.Flow process enters step 544 subsequently, wherein moves filtering interfering the signal to produce the signal of filtering from this.Flow process enters step 546 subsequently, wherein the frequency spectrum shift of the signal of filtering is gone back to the home position and has eliminated interference signals to produce.This output signal is carried out the operation that above-described adaptive power improves subsequently.In above step 544, the enable signal of all right receiving step 524 outputs, and in response to this enable signal startup or its operation of stopping using.
Those skilled in the art also can understand the elimination that this method 500 also can be applicable to a plurality of interference of existing in the signal, wherein detect a plurality of interference by detecting a plurality of peak values in step 520, thereby find the frequency domain position of detected a plurality of interference, eliminate this a plurality of interference respectively by the corresponding number of times of repeating step 540 (step 542-546) subsequently, will eliminate a plurality of interference signals at last and carry out the operation that adaptive power improves.Simultaneously, also can adopt repeatedly frequency domain transform result's mean value to improve the stability and the accuracy of testing result as the frequency position signalling to each detected interference.In addition, also can produce corresponding a plurality of enable signals to control operation respectively in step 524 for the step 544 of each detected interference.
The technology that elimination described here is disturbed can realize in various manners.For example, the various elements of these technology can be implemented in hardware, software or its combination.Realize for hardware, be used for realizing that the element of any of above-mentioned technology (as the process that illustrates in Fig. 5-7) or combination can realize at following element: one or more application specific integrated circuits (ASIC), digital signal processor (DSP), digital signal processing appts (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, other electronic units or its combination of design to realize function described here.
Realize that for software the element of these technology can be realized with the module that realizes above-mentioned functions.Software code can be stored in the memory cell and by processor and carry out.Memory cell can be in processor inside or processor is outside realizes that in this case, they can be coupled to processor communicatedly by variety of way known in the field.
The description of above preferred embodiment makes those skilled in the art can make or use the present invention.The various modifications of these embodiment are conspicuous for a person skilled in the art, here Ding Yi General Principle can be applied among other embodiment and do not use creativity (such as, the high pass filter acquiescence can be made as and enable, then comparison means only produces the enable signal that acts on high pass filter when peak value is not more than predetermined threshold).Therefore, the embodiment that the present invention is not limited to illustrate here, and will meet and the principle and the novel feature the most wide in range consistent scope that disclose here.
Claims (10)
1. one kind is used for the equipment that erasure signal disturbs, and comprising:
Interference detecting apparatus is used for by described signal transformation is detected the frequency domain position that disturbs and disturb to frequency domain and from described signal;
Filtting device on the frequency spectrum, with the coupling of described interference detecting apparatus, the frequency spectrum that is used for moving from the home position by the frequency domain position of described interference is moved the zero frequency place described signal is moved signal to produce;
High pass filter is used for moving the detected interference of signal filtering to produce the signal of filtering from described; And
Filtting device under the frequency spectrum is used for frequency spectrum shift with the signal of described filtering and goes back to described home position and eliminated interference signals to produce.
2. equipment as claimed in claim 1 is characterized in that also comprising:
Automatic gain control equipment is used for the described power of having eliminated interference signals is brought up to reference power.
3. equipment as claimed in claim 1 is characterized in that described interference detecting apparatus comprises:
The frequency domain transform device, being used for described signal transformation is frequency-region signal;
Peak detector is used for detecting the peak value of magnitude squared value of described frequency-region signal to produce and described peak value frequency points corresponding position signalling in bandwidth;
Be used for described frequency position signalling is accumulated as the device of phase signal; And
Sine and cosine look-up table device is used for producing corresponding sine and cosine value according to described phase signal, represents the frequency domain position of detected interference.
4. equipment as claimed in claim 3 is characterized in that described interference detecting apparatus also comprises:
Comparison means is used for described peak value and predetermined threshold are compared, and exports the disables that is used for inactive described high pass filter when described peak value is not more than described predetermined threshold.
5. equipment that is used for a plurality of interference of erasure signal comprises:
Interference detecting apparatus is used for by described signal transformation is detected the frequency domain position of a plurality of interference and detected a plurality of interference from described signal to frequency domain; And
The interference blanking unit of a plurality of serial connections is used for eliminating detected a plurality of interference according to the frequency domain position of a plurality of interference that detected respectively,
Wherein, each interference blanking unit comprises:
Filtting device on the frequency spectrum, the frequency spectrum that is used for moving from the home position by one frequency domain position of detected a plurality of interference is moved the zero frequency place described signal is moved signal to produce;
High pass filter is used for a signal with generation filtering of moving the detected a plurality of interference of signal filtering from described; And
Filtting device under the frequency spectrum is used for frequency spectrum shift with the signal of described filtering and goes back to described home position producing the input of output signal as Filtting device on the frequency spectrum of next interference blanking unit of interference blanking unit of a plurality of serial connections,
Wherein, the output signal that Filtting device produces under the frequency spectrum of last interference blanking unit in the interference blanking unit of a plurality of serial connections is as final output signal.
6. one kind is used for the method that erasure signal disturbs, and may further comprise the steps:
A) by described signal transformation is detected the frequency domain position of interference and detected interference from described signal to frequency domain;
B) frequency spectrum of moving described signal by the frequency domain position of described interference is moved the zero frequency place from the home position is moved signal to produce;
C) move the detected interference of filtering the signal to produce the signal of filtering from described; And
D) frequency spectrum shift of the signal of described filtering is gone back to described home position and eliminated interference signals to produce.
7. method as claimed in claim 6 is characterized in that further comprising the steps of:
E) the described power of having eliminated interference signals is brought up to reference power.
8. method as claimed in claim 6 is characterized in that step a) comprises:
A1) be frequency-region signal with described signal transformation;
A2) in bandwidth, detect the peak value of magnitude squared value of described frequency-region signal to produce and described peak value frequency points corresponding position signalling;
A3) described frequency position signalling is accumulated as phase signal; And
A4) produce corresponding sine and cosine value according to described phase signal, represent the frequency domain position of detected interference.
9. method as claimed in claim 8 is characterized in that step a) also comprises:
Described peak value and predetermined threshold are compared; And
If being not more than predetermined threshold, described peak value exports the disables that is used to ignore described filtering step.
10. method that is used for a plurality of interference of erasure signal may further comprise the steps:
A) by described signal transformation is detected the frequency domain position of a plurality of interference and detected a plurality of interference from described signal to frequency domain;
B) frequency spectrum of moving described signal by one frequency domain position in detected a plurality of interference is moved the zero frequency place from the home position is moved signal to produce;
C) move in the detected a plurality of interference of filtering the signal to produce the signal of filtering from described;
D) frequency spectrum shift of the signal of described filtering is gone back to described home position and eliminated interference signals to produce; And
E) repeating step b)-d) up to eliminating detected a plurality of interference to produce final output signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100283504A CN100562064C (en) | 2006-06-29 | 2006-06-29 | Be used for the method and apparatus that erasure signal disturbs |
| HK08107323.5A HK1116972A1 (en) | 2006-06-29 | 2008-07-02 | A method and apparatus for removing the interference signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100283504A CN100562064C (en) | 2006-06-29 | 2006-06-29 | Be used for the method and apparatus that erasure signal disturbs |
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| CN100562064C CN100562064C (en) | 2009-11-18 |
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| CN101841644A (en) * | 2010-04-14 | 2010-09-22 | 华亚微电子（上海）有限公司 | Adjacent channel interference elimination device and method |
| CN102664843A (en) * | 2012-03-02 | 2012-09-12 | 北京大学 | Method and device for single-frequency interference detection and elimination |
| CN102752002A (en) * | 2012-06-29 | 2012-10-24 | 深圳数字电视国家工程实验室股份有限公司 | Method for eliminating adjacent-channel interference (ACI) and receiver |
| WO2013078991A1 (en) * | 2011-11-28 | 2013-06-06 | 浙江网新技术有限公司 | High-speed rail sensor environment-based short-term pulse interference-elimination device and implementation method |
| CN104614606A (en) * | 2015-01-23 | 2015-05-13 | 青岛海信电器股份有限公司 | Method and device for detecting electromagnetic interference equipment |
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| CN105873231A (en) * | 2014-11-07 | 2016-08-17 | 普天信息技术有限公司 | Method and device for sending random access signal |
| CN106341123A (en) * | 2015-07-07 | 2017-01-18 | 上海无线通信研究中心 | Single-tone interference filtering method and device |
| CN108540151A (en) * | 2017-03-01 | 2018-09-14 | 大唐移动通信设备有限公司 | A kind of method and device for eliminating mono-tone interference |
| CN108631801A (en) * | 2017-03-20 | 2018-10-09 | 展讯通信（上海）有限公司 | Frequency position selection method, device and the receiver of low intermediate frequency signal |
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2006
- 2006-06-29 CN CNB2006100283504A patent/CN100562064C/en active Active
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2008
- 2008-07-02 HK HK08107323.5A patent/HK1116972A1/en not_active IP Right Cessation
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| CN102752002A (en) * | 2012-06-29 | 2012-10-24 | 深圳数字电视国家工程实验室股份有限公司 | Method for eliminating adjacent-channel interference (ACI) and receiver |
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Also Published As
| Publication number | Publication date |
|---|---|
| HK1116972A1 (en) | 2009-01-02 |
| CN100562064C (en) | 2009-11-18 |
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