CN203492046U - A narrowband interference removing apparatus - Google Patents
A narrowband interference removing apparatus Download PDFInfo
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- CN203492046U CN203492046U CN201320573707.2U CN201320573707U CN203492046U CN 203492046 U CN203492046 U CN 203492046U CN 201320573707 U CN201320573707 U CN 201320573707U CN 203492046 U CN203492046 U CN 203492046U
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Abstract
The purpose of the utility model is to provide an apparatus capable of adapting to a power line communication system, removing narrowband interference, and increasing receiver efficiency. The utility model discloses a narrowband interference removing apparatus comprising a detector. The detector is configured to receive a signal on a power line and perform data processing on multiple sub-band signals in the signal, and comprises a notching filter group device. The notching filter group device is configured to perform down-conversion on the multiple sub-band signals, notch the multiple down-conversion signals, and perform up-conversion on the multiple notched signals.
Description
Technical field
The utility model relates to the interference of a kind of electric line communication system arrowband and removes device, and device is removed in the electric line communication system arrowband interference relating in particular to based on OFDM host-host protocol.
Background technology
Power line communication (Power Line Communication is called for short PLC), refers to utilize existing power line, and data or information are transmitted with numerical digit signal processing method.Existing low frequency (50/60Hz) power circuit of PLC utilization transmits the network information in broadband.Use power line communication technology, substantially do not need again to lay in addition network line, and the geographic coverage that power circuit is contained is wide, much larger than the circuit of other kind of carrier.
The English full name of OFDM is Orthogonal Frequenc
y-Division Multiplexing, Chinese implication is OFDM.It adopts a kind of discontinuous multi-tone technology, and a large amount of signals that are called as in the different frequency of carrier wave are merged into single signal, thereby settling signal transmits.Its frame structure is by a series of preamble symbol, and frame head code element and data symbols form.
Electric line communication system in prior art, generally adopt the transport protocol standard based on OFDM, existing electric line communication system receiver, there is detection module, detection module utilizes the autocorrelation performance of preamble symbol signal to carry out the detection of OFDM frame conventionally, and arrowband disturbs and to have very large impact for this detection method, cause detection module to occur that flase drop, frame start position inaccuracy, channel impulse response are inaccurate etc.In order to address this problem, existing technology is that input signal is divided into a plurality of sub-bands, analyze the signal to noise ratio (snr) of each sub-frequency bands, by the lower sub-band filtering of signal to noise ratio, but this technology is not efficient, and because arrowband disturbs conventionally to be occurred with harmonic wave form, having certain impact probability to most of sub-band, existing like this technology is just no longer applicable.
Utility model content
The purpose of this utility model is to provide a kind of can be applicable to electric line communication system, removes arrowband and disturbs, and improves the device of receiver efficiency.
The utility model discloses the interference of a kind of arrowband and remove device, comprising: detection module, is configured to receive the signal on power line, and a plurality of sub-band signals in described signal are carried out to data processing; , described detection module also comprises: notch filter group device, is configured to described a plurality of sub-band signals to carry out down-conversion, and described a plurality of down-conversion signals are carried out to trap, and signal after described a plurality of traps is carried out to up-conversion.
Preferably, in the utility model, the interfering frequency that described notch filter group device is also configured in described a plurality of sub-band signal is down converted to zero-frequency point, and after described trap, signal is returned original frequency by up-conversion.
Preferably, in the utility model, described notch filter group device is also configured to described interfering frequency and is received signal spectrum, measured the signal frame receive or different node and send the explore frame signal of mourning in silence and obtain by measurement.
Preferably, in the utility model, described notch filter group device is also configured to have a plurality of notch filters, and the resonance point of described a plurality of notch filters is identical.
Preferably, in the utility model, described notch filter group device is also configured to described up-conversion and described down-conversion is used same index generator.
Adopted after technique scheme, compared with prior art, the utlity model has and can remove the function that arrowband disturbs, improved receiver efficiency.
Accompanying drawing explanation
Fig. 1 is the existing receiver principle figure based on OFDM agreement;
Fig. 2 is the schematic diagram of detection module of the present utility model;
Fig. 3 is notch filter group schematic diagram of device of the present utility model;
Fig. 4 is initial sub-band spectra figure in preferred embodiment of the present utility model;
Fig. 5 is notch filter spectrogram in preferred embodiment of the present utility model;
Fig. 6 removes the signal spectrum figure that arrowband disturbs in preferred embodiment of the present utility model;
Embodiment
Embodiment of the present utility model has below been described.Be important to note that, can combine by any way all embodiment described below, that is to say, do not have some description embodiment can not with the restriction of other embodiment combination.
Fig. 1 is the existing receiver principle figure based on OFDM agreement, comprise that analog-to-digital conversion module (ADC), the first fast Fourier change module 102(FFT), channel equalizer (EQU), demodulation module (DEMOD) and detection module 101(Detector), analog-to-digital conversion module receives external analog signal, via detection module 101, intercept whether there is signal frame appearance, once listen to signal frame, receiver will be estimated one group of parameter, for the whole signal frame of demodulation.Simultaneously these parameters are respectively the position receiver of starting point (i.e. the first effective sampling points) of signal frame and the sampling clock deviation between transmitter, local frequency deviation (being the local oscillator frequency deviation between receiver and transmitter) and for the parameters such as signal strength signal intensity of automatic gain control.After these parameter Estimation are complete, receiver starts this signal frame of demodulation.
Fig. 2 is the schematic diagram of preferred embodiment detection module of the present utility model, detection module 101 comprises polyphase filters 201, fast Fourier transform 202, notch filter group device 203, in order to improve detection performance, detection module 101 need to be to input signal x[n] I sub-frequency bands data analysis, by a polyphase filters 301 and one second fast Fourier transform module 202 is set thereafter, form sub-band filters and realize this function, this second fast Fourier changes the parameter that module 202 parameters are made as I and are less than the first fast Fourier transform piece 102 shown in Fig. 1.In order to remove arrowband, disturb introducing one notch filter group device 203, after arrowband disturbs and successfully removed, last state no interference signal will be sent to follow up device.
Fig. 3 is notch filter group device 203 schematic diagrams of preferred embodiment of the present utility model, signal x[n] through after polyphase filters 201 and the second fast Fourier transform module 202, be decomposed into a plurality of sub-band signal x
0[m] is to x
n-1[m], wherein sub-band signal x
i[m] through down-conversion operation with exp (j2 π f
im) after multiplying each other, the centre frequency f that arrowband is disturbed
ibe down converted to resonance point, then by the sub-band signal x after this down-conversion
i[m] by the notch filter of this resonance point, and this notch filter is near all interference signal filterings resonance point, afterwards the sub-band signal x after this trap by centre frequency
i[m] carry out again frequency up-conversion operation with exp (j2 π f
im) multiply each other, the sub-band signal x after this trap
ithe frequency that [m] returns to before down-conversion becomes the sub-band signal y disturbing without arrowband
i[m], arrowband disturbs and is just eliminated like this, simultaneously this sub-band signal y
ithe signal to noise ratio of [m] is also enhanced, and has so just played a tunable function.
Preferred notch filter means 203 is configured to have a plurality of notch filters, the resonance point of the plurality of notch filter is identical, avoid like this coefficient of each notch filter to adjust, optimized notch filter group device 203 hard-wired complexities.
If Fig. 4 is initial sub-band spectra figure in preferred embodiment of the present utility model, as seen from the figure, disturb centre frequency f
i=0.1Khz, and signal power is now 0dB, and when initial sub-band is after frequency up-conversion operation, this disturbs centre frequency f
iin zero-frequency point, then the notch filter group device 203 that is zero-frequency point by resonance point.
As shown in Figure 5, the signal power at zero-frequency point place can decay to very little, now makes the sub-band signal after this trap carry out frequency up-conversion operation, and whole sub-band frequency retrieval, to original frequency, disturbs centre frequency f
ithe signal power at place is-100dB that the normal signal of these other parts of sub-band does not change.
As shown in Figure 6, now the signal to noise ratio of sub-band has just obtained significant lifting.
Signal in explanation comprises with mixed noise, and radio broadcasting is disturbed, invade noise with and the signal of mixed noise.
When what note, be, embodiment of the present utility model has preferably implementation, and not the utility model is done to any type of restriction, any person skilled in art of being familiar with may utilize the technology contents change of above-mentioned announcement or be modified to the effective embodiment being equal to, in every case do not depart from the content of technical solutions of the utility model, any modification or equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (5)
1. arrowband disturbs and removes a device, comprising:
Detection module, is configured to receive the signal on power line, and a plurality of sub-band signals in described signal are carried out to data processing;
Notch filter group device, is configured to described a plurality of sub-band signals to carry out down-conversion, and described a plurality of down-conversion signals is carried out to trap, and signal after described a plurality of traps is carried out to up-conversion.
2. device as claimed in claim 1, the interfering frequency that described notch filter group device is also configured in described a plurality of sub-band signal is down converted to zero-frequency point, and after described trap, signal is returned original frequency by up-conversion.
3. device as claimed in claim 2, described notch filter group device is also configured to described interfering frequency and is received signal spectrum, measured the signal frame that receives or different node and send the explore frame signal of mourning in silence and obtain by measurement.
4. device as claimed in claim 1, described notch filter group device is also configured to have a plurality of notch filters, and the resonance point of described a plurality of notch filters is identical.
5. the device as described in claim 1,2,4 any one, described notch filter group device is also configured to use same index generator in described up-conversion and described down-conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573707.2U CN203492046U (en) | 2013-09-16 | 2013-09-16 | A narrowband interference removing apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573707.2U CN203492046U (en) | 2013-09-16 | 2013-09-16 | A narrowband interference removing apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015035922A1 (en) * | 2013-09-16 | 2015-03-19 | 芯迪半导体科技（上海）有限公司 | Device and method for removing narrowband interference of power line communication system |
-
2013
- 2013-09-16 CN CN201320573707.2U patent/CN203492046U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015035922A1 (en) * | 2013-09-16 | 2015-03-19 | 芯迪半导体科技（上海）有限公司 | Device and method for removing narrowband interference of power line communication system |
| CN104468443A (en) * | 2013-09-16 | 2015-03-25 | 芯迪半导体科技（上海）有限公司 | Narrow-band interference eliminating device and method for power line communication system |
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Granted publication date: 20140319 |