CN104301280A - Power line carrier periodic impulse noise detecting and restraining method based on OFDM - Google Patents
Power line carrier periodic impulse noise detecting and restraining method based on OFDM Download PDFInfo
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- CN104301280A CN104301280A CN201410566690.7A CN201410566690A CN104301280A CN 104301280 A CN104301280 A CN 104301280A CN 201410566690 A CN201410566690 A CN 201410566690A CN 104301280 A CN104301280 A CN 104301280A
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- ofdm symbol
- ofdm
- recurrent pulse
- power line
- line carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2681—Details of algorithms characterised by constraints
- H04L27/2688—Resistance to perturbation, e.g. noise, interference or fading
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
A power line carrier periodic impulse noise detecting and restraining method based on the OFDM includes the steps of firstly, judging whether periodic impulse noise exists or not, conducting statistic positioning on the frequency band of the periodic impulse noise, modulating a filter again, and restraining the periodic impulse noise in a targeted mode. The complexity of a traditional noise restraining method is remarkably lowered; meanwhile, the restraining effect is remarkably improved, and the signal accuracy is improved.
Description
Technical field
The present invention relates to communication noise detection technique field, particularly a kind of detection for power line carrier recurrent pulse noise and suppressing method.
Background technology
In low-voltage powerline carrier communication, because electric network composition is complicated, load type is various, make power line to exist a large amount of interference noises, wherein serious with impulse noise interference.Impulsive noise is divided into randomness impulsive noise and periodic pulse noise, wherein periodic pulse noise is the most common, this noise like is produced by electric equipment and frequency comparatively fixing (generally within the scope of 40 ~ 200kHz) usually, its power spectral density is more high than carrier signal (the present invention only considers the noise of frequency in PLC frequency band range) usually, and the duration generally exceedes even several hours a few minutes.When carrier signal is under the interference effect of this kind of impulsive noise, the power-line carrier communication system based on OFDM may be initiated timing error, thus causes the increase of error rate of system.Simultaneously, based in the power-line carrier communication system of OFDM, carrier frequency band is divided into m sub-channels, and recurrent pulse noise is a pulse spike at frequency domain representation, when being subject to such noise jamming, disturbed subcarrier information is completely destroyed, and the information of adjacent sub-carrier also can be affected.Therefore, need to suppress recurrent pulse noise before PLC receiver is synchronous, to guarantee correct synchronized result thus the impact of reduction periodic pulse noise sub-carrier.
The detection of impulsive noise and suppressing method in current technology, first the method calculates average power and the average amplitude of Received signal strength, by the impulse noise detection length of window, power and the amplitude threshold values that set, in window, carry out pulse detection, finally by amplitude limit threshold values, amplitude limit suppression is carried out to it.The defect of this method is, when suppressing the impulsive noise in window, can impact the useful signal in window, and the larger amplitude distortion that may cause too much useful signal of window size.
Summary of the invention
Object of the present invention is just to provide a kind of power line carrier recurrent pulse noise measuring based on OFDM and suppressing method, in order to improve the accuracy of noise location, and the impact on useful signal after noise decrease suppression.
The object of the invention is by such technical scheme realize, concrete steps are as follows:
1) receive a power line carrier OFDM symbol, and fast Fourier change is carried out to it;
2) judge whether this OFDM symbol exists impulse noise interference, if exist, then proceed to step 3), if do not exist, then stop;
3) to a N continuous power line carrier OFDM symbol, carry out fast Fourier change respectively, record this each OFDM symbol impulse disturbances frequency range position, add up the number of times that there is impulse noise interference in this N number of OFDM symbol, judge whether this N number of OFDM symbol exists recurrent pulse noise, if do not exist, then stops, if be greater than threshold values, then proceed to step 4);
4) according to step 3) in the frequency range position of each OFDM symbol impulse disturbances of record, judge the frequency range existing for recurrent pulse noise by majority voting method;
5) according to the frequency range at the recurrent pulse noise place detected, Predetermined filter parameter, uses filter to carry out filtering process.
Further, described method also includes step 6): the nonlinear phase distortion cause processing signals and amplitude distortion compensate.
Further, it is characterized in that, step 2) described in judge that the concrete grammar whether OFDM symbol exists impulse noise interference is:
2-1) calculate the maximum power value P of each subcarrier in this OFDM symbol
max;
2-2) calculate the average power content P of this OFDM symbol
mean;
2-3) maximum power value of each subcarrier is judged, if meet P
max> P
th, P
th=a*P
mean, just think to there is impulse noise interference during this OFDM symbol, and this measurement result counted, i.e. N
pin+ 1, otherwise do not count;
Wherein α is scale factor, N
pinfor there is the sum of impulse noise interference.
Further, it is characterized in that, step 4) described in judge that the concrete grammar whether this N number of OFDM symbol exists recurrent pulse noise is:
4-1) add up the times N that there is impulse noise interference in N number of OFDM symbol
pin;
4-2) judge N
pinwhether be greater than threshold values N
th, wherein N
th<N, if be greater than threshold values, thinks to there is recurrent pulse noise, otherwise, then do not think to there is recurrent pulse noise.
Further, it is characterized in that, the concrete grammar that the nonlinear phase distortion cause processing signals and amplitude distortion compensate is: offset data adopts the mode of curve, and be that curve characteristic stores by data transformations, several places value poor to matching stores separately.
Owing to have employed technique scheme, the present invention has following advantage:
First the present invention judges whether to there is recurrent pulse noise, statistics location is carried out to the frequency range of recurrent pulse noise, modulated filter again, carry out recurrent pulse noise suppressed targetedly, significantly reduce the complexity of conventional noise suppressing method, significantly increase inhibition simultaneously, improve the accuracy of signal.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized by specification below and claims and be obtained.
Accompanying drawing explanation
Accompanying drawing of the present invention is described as follows.
Fig. 1 for one by impulsive noise the performance number of each subcarrier in the OFDM symbol disturbed;
Fig. 2 is recurrent pulse noise decision flow chart;
Fig. 3 is filtering recurrent pulse noise hardware schematic diagram;
Fig. 4 is adaptive notch filter optimum configurations schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
The present invention is a kind of power line carrier recurrent pulse noise measuring based on OFDM and suppressing method, by utilizing the frequency partition characteristic of OFDM sub-carrier channels, performance period impulsive noise detection, and by adaptive notch filter, filtering is carried out to it, thus effectively inhibit recurrent pulse noise, below in conjunction with accompanying drawing, the present invention is described further.
Fig. 1 show one by impulsive noise the performance number of each subcarrier in the OFDM symbol disturbed, according to setting power threshold values, judge whether there is impulse noise interference in each subcarrier, calculating formula is P
max> P
th, P
th=a*P
mean, wherein α is scale factor, P
maxfor the maximum power value of subcarrier, P
meanfor average power content.
Fig. 2 is recurrent pulse noise decision flow chart, as shown in the drawing, first receiver judges whether the OFDM symbol number detected is greater than N, if be not more than, utilize FFT module by the symbol transition that receives on frequency domain, in a symbol, whether impulse disturbances is there is by threshold values multilevel iudge, if exist, sub-carrier positions disturbed in previous OFDM symbol is designated as S (i), wherein i=1,2,3 ... N, S (i) represent the position of disturbed subcarrier in i-th OFDM symbol.Thus by after judging N number of symbol continuously, obtain total number N of the OFDM symbol that there is impulse disturbances
pinif, N
pinbe greater than threshold values N
th(N
th<N), then think that there is impulse disturbances is periodically exist, otherwise there is not recurrent pulse noise.Finally by the method for majority voting, from N
pinthe individual value that there is the S (i) selecting occurrence number maximum in the OFDM symbol of impulse noise interference calculates the frequency of corresponding recurrent pulse noise.
After determining recurrent pulse noise frequency, adaptive notch filter is utilized to carry out filtering process to it before signal is synchronous, hardware implementing structure chart as shown in Figure 3, after the FFT that recurrent pulse noise measuring is used and system synchronization detect, FFT used is the time sharing shared of same module, thus saved hardware resource, if adaptive notch filter is not enabled, this module does not do any process to signal, is directly sent to synchronous detection.
The relevant parameter of each notch filter is precomputed according to each sub-carrier frequencies, and by result of calculation stored in ROM, to call corresponding filtering parameter in ROM, notch filter is arranged by the above-mentioned periodic noise frequency detected, reach the effect of filtering noise thus.Fig. 4 is the parameter call of adaptive notch filter in this system.Because filter parameter can preset, corresponding compensating parameter also can precalculate out thus, adopt the mode of curve to carry out storing so that system call for offset data, memory data output can be reduced while guarantee offset data precision thus.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of the technical program, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1., based on the noise measuring of power line carrier recurrent pulse and a suppressing method of OFDM, it is characterized in that, concrete steps are as follows:
1) receive a power line carrier OFDM symbol, and fast Fourier change is carried out to it;
2) judge whether this OFDM symbol exists impulse noise interference, if exist, then proceed to step 3), if do not exist, then stop;
3) to a N continuous power line carrier OFDM symbol, carry out fast Fourier change respectively, record this each OFDM symbol impulse disturbances frequency range position, add up the number of times that there is impulse noise interference in this N number of OFDM symbol, judge whether this N number of OFDM symbol exists recurrent pulse noise, if do not exist, then stops, if be greater than threshold values, then proceed to step 4);
4) according to step 3) in the frequency range position of each OFDM symbol impulse disturbances of record, judge the frequency range existing for recurrent pulse noise by majority voting method;
5) according to the frequency range at the recurrent pulse noise place detected, Predetermined filter parameter, uses filter to carry out filtering process.
2. a kind of power line carrier recurrent pulse noise measuring based on OFDM and suppressing method as claimed in claim 1, it is characterized in that, described method also includes step 6): the nonlinear phase distortion cause processing signals and amplitude distortion compensate.
3. a kind of power line carrier recurrent pulse noise measuring based on OFDM and suppressing method as claimed in claim 1, is characterized in that, step 2) described in judge that the concrete grammar whether OFDM symbol exists impulse noise interference is:
2-1) calculate the maximum power value P of each subcarrier in this OFDM symbol
max;
2-2) calculate the average power content P of this OFDM symbol
mean;
2-3) maximum power value of each subcarrier is judged, if meet P
max> P
th, P
th=a*P
mean, just think to there is impulse noise interference during this OFDM symbol, and this measurement result counted, i.e. N
pin+ 1, otherwise do not count;
Wherein α is scale factor, N
pinfor there is the sum of impulse noise interference.
4. a kind of power line carrier recurrent pulse noise measuring based on OFDM and suppressing method as claimed in claim 1, is characterized in that, step 4) described in judge that the concrete grammar whether this N number of OFDM symbol exists recurrent pulse noise is:
4-1) add up the times N that there is impulse noise interference in N number of OFDM symbol
pin;
4-2) judge N
pinwhether be greater than threshold values N
th, wherein N
th<N, if be greater than threshold values, thinks to there is recurrent pulse noise, otherwise, then do not think to there is recurrent pulse noise.
5. as a kind of power line carrier recurrent pulse noise measuring based on OFDM and suppressing method as claimed in claim 2, it is characterized in that, the concrete grammar that the nonlinear phase distortion cause processing signals and amplitude distortion compensate is: offset data adopts the mode of curve, be that curve characteristic stores by data transformations, several places value poor to matching stores separately.
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Cited By (11)
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| CN106160906A (en) * | 2015-03-27 | 2016-11-23 | 大唐联诚信息***技术有限公司 | Signal processing method and device |
| CN106357582A (en) * | 2016-10-27 | 2017-01-25 | 长沙理工大学 | In-band and out-band interference suppression signal modulation and demodulation method based on subcarrier cluster independent filtering |
| CN106506042A (en) * | 2016-10-20 | 2017-03-15 | 宁波大学 | It is based on L1/2The electric line communication system impulse noise suppression method of norm regularization |
| CN106936743A (en) * | 2017-03-16 | 2017-07-07 | 宁波大学 | A kind of electric line communication system impulse noise suppression method |
| CN106992800A (en) * | 2017-03-16 | 2017-07-28 | 宁波大学 | Electric line communication system impulse noise suppression method based on iteration self-adapting algorithm |
| CN107359906A (en) * | 2017-06-01 | 2017-11-17 | 宁波大学 | The suppressing method of impulsive noise in low pressure power line communication system |
| CN107360111A (en) * | 2017-06-01 | 2017-11-17 | 宁波大学 | Impulsive Noise Mitigation Method in a kind of power line communication based on compressed sensing |
| CN109617573A (en) * | 2019-01-25 | 2019-04-12 | 北京智芯微电子科技有限公司 | The real-time detection and suppressing method of power line impulsive noise |
| CN110401610A (en) * | 2019-09-04 | 2019-11-01 | 深圳市富斯科技有限公司 | Ofdm system anti-disturbance method, device and electronic equipment and storage medium |
| CN111082837A (en) * | 2019-11-25 | 2020-04-28 | 宁波大学 | Recursive compressed sensing-based impulse noise suppression method for power line communication system |
| CN112583754A (en) * | 2019-09-30 | 2021-03-30 | 华为技术有限公司 | Communication method and related device |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160906A (en) * | 2015-03-27 | 2016-11-23 | 大唐联诚信息***技术有限公司 | Signal processing method and device |
| CN106506042A (en) * | 2016-10-20 | 2017-03-15 | 宁波大学 | It is based on L1/2The electric line communication system impulse noise suppression method of norm regularization |
| CN106506042B (en) * | 2016-10-20 | 2019-06-07 | 宁波大学 | Based on L1/2The electric line communication system impulse noise suppression method of norm regularization |
| CN106357582A (en) * | 2016-10-27 | 2017-01-25 | 长沙理工大学 | In-band and out-band interference suppression signal modulation and demodulation method based on subcarrier cluster independent filtering |
| CN106992800A (en) * | 2017-03-16 | 2017-07-28 | 宁波大学 | Electric line communication system impulse noise suppression method based on iteration self-adapting algorithm |
| CN106992800B (en) * | 2017-03-16 | 2019-11-15 | 宁波大学 | Electric line communication system impulse noise suppression method based on iteration self-adapting algorithm |
| CN106936743B (en) * | 2017-03-16 | 2019-11-15 | 宁波大学 | A kind of electric line communication system impulse noise suppression method |
| CN106936743A (en) * | 2017-03-16 | 2017-07-07 | 宁波大学 | A kind of electric line communication system impulse noise suppression method |
| CN107360111B (en) * | 2017-06-01 | 2019-07-09 | 宁波大学 | Impulsive Noise Mitigation Method in a kind of compressed sensing based power line communication |
| CN107359906A (en) * | 2017-06-01 | 2017-11-17 | 宁波大学 | The suppressing method of impulsive noise in low pressure power line communication system |
| CN107360111A (en) * | 2017-06-01 | 2017-11-17 | 宁波大学 | Impulsive Noise Mitigation Method in a kind of power line communication based on compressed sensing |
| CN107359906B (en) * | 2017-06-01 | 2020-06-16 | 宁波大学 | Method for suppressing impulse noise in low-voltage power line communication system |
| CN109617573A (en) * | 2019-01-25 | 2019-04-12 | 北京智芯微电子科技有限公司 | The real-time detection and suppressing method of power line impulsive noise |
| CN110401610A (en) * | 2019-09-04 | 2019-11-01 | 深圳市富斯科技有限公司 | Ofdm system anti-disturbance method, device and electronic equipment and storage medium |
| CN112583754A (en) * | 2019-09-30 | 2021-03-30 | 华为技术有限公司 | Communication method and related device |
| CN114915532A (en) * | 2019-09-30 | 2022-08-16 | 华为技术有限公司 | Communication method and related device |
| CN111082837A (en) * | 2019-11-25 | 2020-04-28 | 宁波大学 | Recursive compressed sensing-based impulse noise suppression method for power line communication system |
| CN111082837B (en) * | 2019-11-25 | 2021-04-23 | 宁波大学 | Recursive compressed sensing-based impulse noise suppression method for power line communication system |
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