CN208445556U - The detection device of OFDM electric line communication system narrowband interference - Google Patents
The detection device of OFDM electric line communication system narrowband interference Download PDFInfo
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- CN208445556U CN208445556U CN201821067241.8U CN201821067241U CN208445556U CN 208445556 U CN208445556 U CN 208445556U CN 201821067241 U CN201821067241 U CN 201821067241U CN 208445556 U CN208445556 U CN 208445556U
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Abstract
The utility model discloses a kind of detection devices of OFDM electric line communication system narrowband interference, which includes: coupling transformer；Analog bandpass filter；AFE(analog front end)；Digital filter；Narrow-band band-elimination filter is connected with the digital filter；Data cache controller is connected with the digital filter and narrow-band band-elimination filter, and the signal that the digital filter exports is formatted and stored；Memory；Processor is connected with the memory, for FFT operation and narrowband interference analysis；And man-machine interface, it couples with the processor, is interfered as the result is shown for command interaction and narrowband.The detection device of the OFDM electric line communication system narrowband interference of the utility model, can solve on OFDM power-line carrier communication system Timing Synchronization with it is synchronous it is two kinds not upper in the case of narrowband Interference Detection, and improve detection accuracy.
Description
Technical field
The utility model is to interfere about carrier communication field especially with regard to a kind of OFDM electric line communication system narrowband
Detection device.
Background technique
Power line communication refers to a kind of communication mode using power line transmission data and media signal.Power line is initially
It is not a kind of ideal communication channel for conveying electric energy design.There are serious multipath fadings, arteries and veins in power line channel
Rush noise, ambient noise and narrowband interference.In order to realize the data transmission of reliable high speed, the at present electric power of mainstream on power line
Line carrier communication agreement all uses OFDM (Orthogonal Frequency Division Multiplexing, i.e. orthogonal frequency
Divide multiplexing) technology, it can be effectively in conjunction with longer cyclic prefix, stronger channel interleaving, diversity copy and channel coding technology
To anti-multipath fading, impulsive noise and ambient noise.But narrowband generally existing in power line is interfered, agreement itself is not
It is provided with good mechanism.
Narrowband interference typically refers in the lesser frequency range of some relative bandwidth, continues within a certain period of time or basic
Continue existing strong interference.It is right if narrowband interference frequency point appears in the position of subcarrier just in ofdm communication system
Answering the data of subcarrier can seriously be damaged, and systematic bits error rate is caused to rise；If narrowband interference frequency point is located at two sons
Between carrier wave, FFT spectrum leakage, the influence for causing two subcarrier datas all to be interfered by narrowband will be increased.If narrowband is dry
Scrambling point is more, intensity is big, such as detects and inhibits not in time, directly affects the accuracy of the accuracy and channel estimation of timing, sternly
It will lead to receiver when weight not synchronize, subsequent demodulation and decoding operate can not be carried out.
Existing power line narrowband interference detection technique is normally based on the channel frequency domain response or letter of each subcarrier of OFDM
Make an uproar than carrying out dynamic detection, it is contemplated that in power line there may be multiple narrowbands interfere and its frequency point and subcarrier frequency point generally not
Identical, this technology acuracy is inadequate, can damage useful signal, is suitable for ultra-wideband OFDM power-line carrier communication system, narrow
With less effective in ofdm system and common wideband OFDM system (such as bandwidth is less than the less system of 15MHz, sub-carrier number).
In fact, stronger narrowband interference is usually by other narrowband power line communications, amplitude modulation near local receiver in power line
Caused by the low frequency signals such as broadcast, ham radio, have and change over time less, the feature of non-hostility is a kind of quiet
State or the interference of quasi-static narrowband, therefore timing frequency sweep or on-line analysis mode can be used in narrowband Interference Detection, it is correct to examine
After measuring narrowband interference, it is real-time to configure corresponding IIR (Infinite Impulse Response, infinite impulse response) trapper
It filters out, this implementation is at low cost, inhibitory effect is good.
The device or method of existing narrowband Interference Detection mainly have it is several, one is utilize frequency spectrograph frequency sweep, in electric power
When line carrier communication system deployment, frequency sweep repeatedly is carried out to power line by coupler using high performance frequency spectrograph, is determined narrow
After the information such as center frequency point, intensity and bandwidth with interference, set by relevant parameter in update power-line carrier communication system
The removal that narrowband interference is carried out after IIR trapper is set, this method precision is high, but usually frequency spectrograph volume and weight are all larger,
Mobile operating cost is high, and when narrowband interference changes needs frequency sweep again, time-consuming and laborious, is not easy to on-line analysis.It is another
Common method or device are using the FFT module in OFDM power-line carrier communication system or in chip receiver, after synchronizing
Reception signal carry out time-frequency conversion after sub-carrier power be compared, if peak power is apparently higher than mean power, recognize
For be narrowband interference, this method there are two limitations, one be receiver Timing Synchronization palpus can correctly obtain, the other is
By the limitation of hardware FFT (Fast Fourier Transformation, Fast Fourier Transform (FFT)) points and bit wide, narrowband is dry
The precision disturbed generally can not be higher than the interval of subcarrier.
The information disclosed in the background technology section is intended only to increase the understanding to the general background of the utility model, and
It is not construed as recognizing or implying in any form that information composition is already known to those of ordinary skill in the art existing
Technology.
Utility model content
The purpose of this utility model is to provide a kind of detection device of OFDM electric line communication system narrowband interference, energy
Narrowband Interference Detection is enough effectively performed.
To achieve the above object, the utility model provides a kind of detection dress of OFDM electric line communication system narrowband interference
It sets, comprising: coupling transformer, for being coupled out carrier signal from low-voltage power line；Analog bandpass filter is coupled with described
Transformer is connected, for filtering out the out of band signal in the carrier signal；AFE(analog front end), with the analog bandpass filter phase
Connection, the gain for signal are enlarged or reduced, which is equipped with analog-digital converter and is turned so that carrier signal is carried out modulus
It changes；Digital filter is connected with the AFE(analog front end), for further being filtered to the digital signal after conversion；Narrowband
Bandstop filter is coupled with the digital filter；Data cache controller is filtered with the digital filter and narrow-band band-elimination
Device couples, and the signal that the digital filter exports is formatted；Memory, with the data cache controller phase
Even, it is stored for the data after formatting the data cache controller；Processor, with the memory phase
Connection, for FFT operation and narrowband interference analysis；And man-machine interface, it is coupled with the processor, is used for command interaction and narrowband
Interference is as the result is shown.
In a preferred embodiment, the detection device of OFDM electric line communication system narrowband interference further include: increase
Beneficial controller is coupled between the AFE(analog front end) and the digital filter, which is based on received signal function
Rate controls the signal gain of the AFE(analog front end).
In a preferred embodiment, the detection device of OFDM electric line communication system narrowband interference further include: fixed
When synchronizer, coupled with the data cache controller, for determining the initial position of synchronizing sequence in signal frame.
In a preferred embodiment, the digital filter can be arranged to number according to actual signal bandwidth
Bandpass filter or wave digital lowpass filter.
In a preferred embodiment, automatic gain mode or manual gain mould can be set as by stating gain controller
Formula.
In a preferred embodiment, the man-machine interface includes GPIO, serial ports, keyboard and touch screen.
In a preferred embodiment, the narrow-band band-elimination filter is the cascade IIR trap of a second order lattice
Device group, effective number, center frequency point, the bandwidth of the IIR trapper group can be configured by the processor
In a preferred embodiment, which can be independently of the OFDM electric line communication system or integration
In the chip of the OFDM electric line communication system.
Compared with prior art, the detection device of OFDM electric line communication system according to the present utility model narrowband interference,
It can be used as an independent power line Portable narrow band interference detector, power line carrier communication chip or system can also be integrated into
It is middle that narrowband is used as to interfere in-line analyzer.The detection device uses synchronization when carrier communication receiver, which synchronizes, correctly to be obtained
Frame control afterwards carries out narrowband Interference Detection with payload data；In narrowband, interference is more, intensity is sufficiently large, and synchronizing cannot be just
When really obtaining, reception gain is manually adjusted, the sweep method of multiple different accuracy obtains the information of narrowband interference.This programme is adopted
Realize FFT transform, FFT points and butterfly computation process intermediate variable and FFT output bit wide not by hardware electricity with software mode
Road limitation, can accomplish it is very high so that narrowband Interference Detection and inhibition reach very high-precision.
Detailed description of the invention
Fig. 1 is the detection device interfered according to the OFDM electric line communication system narrowband of one embodiment of the utility model
Schematic diagram.
Specific embodiment
With reference to the accompanying drawing, specific embodiment of the present utility model is described in detail, it is to be understood that this is practical
Novel protection scope is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
As shown in Figure 1, the inspection interfered according to the OFDM electric line communication system narrowband of the preferred embodiments of the present invention
Surveying device includes: coupling transformer 11, for being coupled out carrier signal from low-voltage power line；Analog bandpass filter 12, with
Coupling transformer 11 is connected, for filtering out the out of band signal in carrier signal；AFE(analog front end) 13, with analog bandpass filter
12 are connected, and the gain for signal is enlarged or reduced, which is equipped with analog-digital converter so that carrier signal is carried out mould
Number conversion；Digital filter 15 is connected with AFE(analog front end) 14, for further being filtered to the digital signal after conversion；
Timing synchronizer 17, the initial position of the synchronizing sequence correlation peak for determining signal frame；Data cache controller 18, with number
Word filter 15 and timing synchronizer 17 couple, and the signal that digital filter exports is formatted；Memory 19, with
Data cache controller 18 is connected, and stores for the data after formatting data cache controller 18；Place
Device 20 is managed, is connected with memory 19, for FFT operation and narrowband interference analysis；It with man-machine interface 21, couples, uses with processor
As the result is shown in command interaction and narrowband interference.
In a preferred embodiment, detection device further includes gain controller 14, is coupled in 13 sum number of AFE(analog front end)
Between word filter 15, which is based on received signal power, controls the signal gain of AFE(analog front end).This
Outside, which can be set as automatic gain mode or manual gain mode.
In a preferred embodiment, detection device further includes narrow-band band-elimination filter 16, with data cache controller
18 couplings.The narrow-band band-elimination filter is a cascade IIR trapper group, effective number of the IIR trapper group, center frequency
Point, bandwidth can be configured by processor 20.
In a preferred embodiment, digital filter 15 is enough according to actual signal bandwidth, is arranged to digital band pass filter
Wave device or wave digital lowpass filter.
In a preferred embodiment, data cache controller 18 selectively with digital filter 15 or narrow-band band-elimination
Filter 16 is communicated.
In a preferred embodiment, man-machine interface 21 includes GPIO, serial ports, keyboard and touch screen.
In a preferred embodiment, which independently of OFDM electric line communication system or can be incorporated into OFDM
In the chip of electric line communication system.
The detection interfered according to the OFDM electric line communication system narrowband of the preferred embodiments of the present invention is filled below
The mode of operation set is introduced.
The narrowband Interference Detection point of the detection device of OFDM electric line communication system according to the present utility model narrowband interference
Three kinds of situations are frequency sweep mode, synchronous mode and patrol mode respectively.
Frequency sweep mode be directed to narrowband interference it is larger, timing does not synchronize, and can not determine the feelings of the initial position of frame
Condition, therefore use blind detection method.Process is as follows:
1) gain controls: setting gain controller 14 is manual mode, and setting analog gain is half range value, turns off number
Gain waits gain control to stablize.
2) data capture: the input of setting data cache controller 18 is the output of digital lowpass bandpass filter, setting
Data sampling points, then allow data cache controller 18 to work, and carry out data capture, capture is automatically stopped when completing, to place
20 hair of device is managed to interrupt.
3) data review: processor calculates data mean power and counts to peak value sampling point.Firstly, if sampled point
Amplitude is greater than first threshold, then it is assumed that this sampled point is peak point；If peak value number be greater than second threshold, then it is assumed that data without
Then effect reduces 2dB to signal gain, re-starts data capture.If yield value has had arrived at minimum value, it is reported to place
Manage device；Otherwise, mean power and signal gain value are judged, if mean power is greater than target power or signal gain value has reached
Maximum value, then it is assumed that data are effective.Then, if mean power is less than target power, target power and mean power are calculated
Difference, takes the larger value in power difference and 2dB, and analog gain increases described the larger value, re-starts data capture to calculate
Data mean power simultaneously counts peak value sampling point.
In one embodiment, the first threshold is that wave amplitude expires the 95% of amplitude, and the second threshold is total sampled point
Several 20%.
4) data are analyzed: processor 20 carries out fft analysis based on valid data by the way of sliding window, before fft analysis
Windowing process first is carried out to initial data to limit spectral leakage, frequency domain resolution is Δ f/2, and exports and be added to multiple FFT
It averages, then averages (P_avg) to narrow-band band-elimination filter 16 with interior effective sub-carrier power and standard deviation (P_std),
According to P_avg and P_std, the decision threshold (P_avg+ α * P_std, α value depends on P_std) of narrowband interference is determined, then
The peak value starting point of narrowband interference is searched for according to decision threshold, so that it is determined that center frequency point, bandwidth and the number of narrowband interference.If
The number of narrowband interference is greater than 0, then it is Δ f/4 that FFT frequency domain resolution, which is arranged, repeats above procedure, obtains more accurate narrow
Then number, center frequency point and bandwidth value with interference calculate the coefficient of narrow-band band-elimination filter 16, if more according to above- mentioned information
A narrowband interference is close adjacent, it is believed that is that the narrowband with larger width interferes, can be pressed down with an IIR trapper
System, otherwise an IIR trapper is arranged in a narrowband interfering frequencies, and after IIR trapper is arranged, it is same to attempt the normal timing of progress
Step.If the number of narrowband interference is 0, the above 1-4 process of repetition is multiple, if not finding also, notifies upper layer, not find narrowband
Interference.
For synchronous mode, if on system energy Timing Synchronization, gain controller 14 is set as automatic mode, data are slow
The input of memory controller 18 is the valid data after Timing Synchronization, directly carries out data analysis, and analysis method is same as above.
For patrol mode, it is therefore an objective to determine whether narrowband interference has occurred variation (increasing or decreasing).Can timing it is same
In the case where in step, gain controller 14 is set as automatic mode, and the input of data cache controller 18 is the filter of digital lowpass band logical
The output of wave device 15 or narrow-band band-elimination filter 16, directly progress data analysis, analysis method are same as above, if analyzing narrowband interference
It changes, then updates the setting of IIR trapper.
In conclusion the detection device of OFDM electric line communication system according to the present utility model narrowband interference, supports to sweep
Frequency mode, synchronous mode and patrol mode can solve on OFDM power-line carrier communication system Timing Synchronization with synchronous not upper two
Narrowband Interference Detection in the case of kind, while narrowband being supported to interfere detection when changing at a slow speed.
The description of the aforementioned specific exemplary embodiment to the utility model is in order to illustrate and illustration purpose.These
Description is not wishing to for the utility model to be limited to disclosed precise forms, and it will be apparent that according to the above instruction, can carry out
It is many to change and change.The purpose of selecting and describing the exemplary embodiment is that explaining the specific principle of the utility model
And its practical application, so that those skilled in the art can be realized and utilize a variety of different examples of the utility model
Property embodiment and various chooses and changes.The scope of the utility model is intended to by claims and its waits similar shapes
Formula is limited.
Claims (8)
1. a kind of detection device of OFDM electric line communication system narrowband interference characterized by comprising
Coupling transformer, for being coupled out carrier signal from low-voltage power line；
Analog bandpass filter is connected with the coupling transformer, for filtering out the out of band signal in the carrier signal；
AFE(analog front end) is connected with the analog bandpass filter, and the gain for signal is enlarged or reduced, which sets
There is analog-digital converter so that carrier signal is carried out analog-to-digital conversion；
Digital filter is connected with the AFE(analog front end), for further being filtered to the digital signal after conversion；
Narrow-band band-elimination filter is connected with the digital filter；
Data cache controller is connected with the digital filter and narrow-band band-elimination filter, and the digital filter is defeated
Signal out formats；
Memory is connected with the data cache controller, after formatting the data cache controller
Data are stored；
Processor is connected with the memory, for FFT operation and narrowband interference analysis；With
Man-machine interface is connected with the processor, interferes as the result is shown for command interaction and narrowband.
2. the detection device of OFDM electric line communication system as described in claim 1 narrowband interference, which is characterized in that also wrap
It includes:
Gain controller is connected between the AFE(analog front end) and the digital filter, which is based on received
Signal power controls the signal gain of the AFE(analog front end).
3. the detection device of OFDM electric line communication system as described in claim 1 narrowband interference, which is characterized in that also wrap
Include: timing synchronizer is connected with the data cache controller, for determining the initial position of synchronizing sequence in signal frame.
4. the detection device of OFDM electric line communication system as described in claim 1 narrowband interference, which is characterized in that the number
Word filter can be arranged to digital band-pass filter or wave digital lowpass filter according to actual signal bandwidth.
5. the detection device of OFDM electric line communication system as claimed in claim 2 narrowband interference, which is characterized in that the increasing
Beneficial controller can be set as automatic gain mode or manual gain mode.
6. the detection device of OFDM electric line communication system as described in claim 1 narrowband interference, which is characterized in that the people
Machine interface includes GPIO, serial ports, keyboard and touch screen.
7. the detection device of OFDM electric line communication system as described in claim 1 narrowband interference, which is characterized in that described narrow
Band bandstop filter is a cascade second order lattice IIR trapper group, effective number of the IIR trapper group, center frequency point,
Bandwidth can be configured by the processor.
8. the detection device that the OFDM electric line communication system narrowband as described in any one of claims 1 to 7 interferes, feature
It is, which independently of the OFDM electric line communication system or can be incorporated into the OFDM electric line communication system
In chip.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649999A (en) * | 2018-07-06 | 2018-10-12 | 北京智芯微电子科技有限公司 | The detection device and detection method of OFDM electric line communication systems narrowband interference |
| CN111464210A (en) * | 2020-04-01 | 2020-07-28 | 深圳市均方根科技有限公司 | Data diversity combining method and device, communication equipment and storage medium |
| CN112636785A (en) * | 2020-11-27 | 2021-04-09 | 北京智芯微电子科技有限公司 | Narrow-band interference detection device and detection method for power line communication system |
-
2018
- 2018-07-06 CN CN201821067241.8U patent/CN208445556U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649999A (en) * | 2018-07-06 | 2018-10-12 | 北京智芯微电子科技有限公司 | The detection device and detection method of OFDM electric line communication systems narrowband interference |
| CN108649999B (en) * | 2018-07-06 | 2024-01-30 | 北京智芯微电子科技有限公司 | Detection device and detection method for narrow-band interference of OFDM power line communication system |
| CN111464210A (en) * | 2020-04-01 | 2020-07-28 | 深圳市均方根科技有限公司 | Data diversity combining method and device, communication equipment and storage medium |
| CN112636785A (en) * | 2020-11-27 | 2021-04-09 | 北京智芯微电子科技有限公司 | Narrow-band interference detection device and detection method for power line communication system |
| CN112636785B (en) * | 2020-11-27 | 2022-01-14 | 北京智芯微电子科技有限公司 | Narrow-band interference detection device and detection method for power line communication system |
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