CN103259754B - A kind of digital front-end system and its implementation for power line carrier communication - Google Patents
A kind of digital front-end system and its implementation for power line carrier communication Download PDFInfo
- Publication number
- CN103259754B CN103259754B CN201310091035.6A CN201310091035A CN103259754B CN 103259754 B CN103259754 B CN 103259754B CN 201310091035 A CN201310091035 A CN 201310091035A CN 103259754 B CN103259754 B CN 103259754B
- Authority
- CN
- China
- Prior art keywords
- signal
- digital
- frequency
- band
- base band
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004891 communication Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 238000005070 sampling Methods 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 16
- 230000009466 transformation Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 241000638935 Senecio crassissimus Species 0.000 claims 1
- 238000004088 simulation Methods 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 6
- 230000001629 suppression Effects 0.000 abstract description 6
- 125000004122 cyclic group Chemical group 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- BYACHAOCSIPLCM-UHFFFAOYSA-N 2-[2-[bis(2-hydroxyethyl)amino]ethyl-(2-hydroxyethyl)amino]ethanol Chemical group OCCN(CCO)CCN(CCO)CCO BYACHAOCSIPLCM-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5429—Applications for powerline communications
- H04B2203/5433—Remote metering
Abstract
A kind of field of power communication the present invention relates to support intelligent grid, and in particular to digital front-end system and its implementation for power line carrier communication；The digital front-end system includes the transmitter and receiver for being communicated successively；Emitter includes the inverse Fourier transform module, adding window module I, interpolation filter, frequency mixer I and the digital analog converter that are communicated successively；The receiver includes the analog-digital converter, frequency mixer II, decimation filter, adding window module ii and the Fourier transform module that are communicated successively.The implementation method comprises the steps：（1）Modulation symbol is input to analog signal is converted on emitter；（2）Modulation symbol will be converted in analog signal input to receiver.The present invention is combined the digital front-end of equivalent complex baseband form with the method for Nyquist window, with support frequency band selection, is supported band width configuration, suppression out-of-band interference, the outer energy of reduction sending signal band and is suppressed the characteristics of being disturbed with interior arrowband.
Description
Technical field
Field of power communication the present invention relates to support intelligent grid, and in particular to a kind of for power line carrier communication
Support the digital front-end system and its implementation of equivalent complex baseband quadrature frequency division multiplex OFDM modulation.
Background technology
Compared with other communication systems, power line carrier communication channel is more complicated and changeable.Power line carrier communication channel
With frequency selectivity, time variation, with coloured ambient noise, arrowband interference and various impulsive noises, these characteristics are main
It is as caused by the various electrical equipment being connected on power line.For example, European CE（Europe is unified, CONFORMITE
EUROPEENNE）Certification only measures electromagnetic compatibility of the test electrical equipment more than 150 KHzs（EMC）Characteristic, therefore, 150 kilo hertzs
Hereby following noise is very high.Meanwhile, the decay changed with transmission range, electric network composition, channel impedance and frequency is also
The important factor in order of power line carrier communication.In addition, in smart electric grid system, different tissues can provide different answering
With such as advanced measuring system（AMI）, grid automation etc., and the required service quality of different services also differs greatly, this
The divided band in power network is accomplished by be realized.Therefore, various electric line communication systems may be operated in same section of electric power
Under line, a signal for system can turn into interference for other system, and the energy of this out-of-band interference is even larger than
Signal energy in itself.
It can be seen that, the reliability of noise and decay for guarantee electric line communication system on reply electric line communication system channel
Property is most important.Therefore, an electric line communication system with robustness needs flexible selection of the support to frequency and bandwidth,
Support to the suppression of out-of-band noise to improve available frequency band range, reduction is done with reducing with outer transmit power to adjacent system
Disturb, and can reduce to the full extent with the interference of interior arrowband to orthogonal frequency division multiplex OFDM subcarrier reception performance adjacent thereto
Influence.In order to avoid reaching object above using sufficiently complex AFE(analog front end), it is necessary to reference to being ground in newest prior art
Study carefully the digital front-end structure that can support function above.
Because the band frequency that power line carrier communication is used is relatively low, generally tens KHzs to tens megahertzs it
Between, therefore, it is traditional based on OFDM（OFDM）The digital front-end of electric line communication system do not use digital mixing
Device, but directly data signal is modulated and processed in base band, signal is mapped to transmitting terminal the subcarrier for needing to use
On, the subcarrier for being used directly correspond to the frequency range that information transfer is used.OFDM symbol is by after inverse Fourier transform, entering
Row over-sampling and low-pass filtering treatment, then directly launch to digital analog converter.This traditional digital front-end cannot be realized protecting
Card improves available band scope while with less subcarrier spacing, and especially heart frequency is higher in use（Such as 10
Megahertz）Arrowband OFDM when being communicated, the complexity of system can be greatly improved.
The digital front-end of equivalent complex baseband form is widely used in wireless communication field.With traditional digital front-end structure
Difference, in transmitting terminal, the digital front-end of equivalent complex baseband form is moved to passband signal from base band using digital mixer
It is interior, it is opposite, in receiving terminal, bandpass signal is moved into base band using digital mixer, forming equivalent baseband signal is carried out
Treatment, so as to reduce the difficulty for want sum filter design to receiver sampling rate, but equivalent complex baseband form
Digital front-end is there is presently no being used for power line carrier communication field.The method of Nyquist window function has been used for channel radio
Believe the receiving terminal treatment of ofdm system, but be not suggested also in power-line carrier communication system.
The content of the invention
In view of the shortcomings of the prior art, it is equivalent it is an object of the invention to provide a kind of support for power line carrier communication
The digital front-end system of complex baseband quadrature frequency division multiplex OFDM modulation, another object is to provide a kind of logical for power line carrier
The implementation method of the digital front-end system of letter, the present invention is by the side of the digital front-end of equivalent complex baseband form and Nyquist window
Method is combined, and with support frequency band selection, is supported band width configuration, suppression out-of-band interference, the outer energy of reduction sending signal band and is suppressed
The characteristics of being disturbed with interior arrowband.
The purpose of the present invention is realized using following technical proposals：
A kind of digital front-end system for power line carrier communication, it is theed improvement is that, the digital front-end system
Including the transmitter and receiver for being communicated successively；The emitter includes the inverse Fourier transform mould for being communicated successively
Block, adding window module I, interpolation filter, frequency mixer I and digital analog converter；The receiver includes the modulus for being communicated successively
Converter, frequency mixer II, decimation filter, adding window module ii and Fourier transform module.
Preferably, the inverse Fourier transform module realizes conversion modulation symbol to the equivalent complex base band signal of time domain
Conversion；The adding window module I is used to reduce the outer energy of band of equivalent complex baseband quadrature frequency division multiplex OFDM and sub-carrier signal；
The interpolation filter is cascade mode, the sample rate for improving equivalent complex base band signal step by step；The frequency mixer I is realized
Conversion of the equivalent complex base band signal to digital band-pass signal；The digital analog converter is used to for digital band-pass signal to be converted to mould
Intend signal.
Preferably, the receiver realizes the operation opposite with emitter, and the analog-digital converter changes analog signal
It is digital band-pass signal；The frequency mixer II realizes digital band-pass signal to the conversion of equivalent complex base band signal；The extraction
Wave filter is cascade mode, the sample rate for reducing equivalent complex base band signal step by step；The adding window module ii is used to suppress
The interior arrowband interference of band of equivalent complex base band signal；The Fourier transform module realizes that equivalent complex base band signal is accorded with to modulation
Number conversion.
More preferably, the input signal of the receiver is that analog signal is converted to number tape communication by analog-digital converter
Number, digital band-pass signal turns into equivalent complex base band signal by frequency mixer II frequency conversions again；Equivalent complex base band signal passes through one
Stage speed transformation factor is RaExtraction low pass filter and M grades cascade the speed conversion factor be 2 extraction low pass filter,
It is down-sampled to sample frequency be fsEquivalent complex base band signal；Nyquist window adding window and Fourier transform processing are performed, is obtained
To modulation symbol；Wherein fsFrom 1 KHz to 50 megahertzs.
More preferably, adding window module I and adding window module ii use raised cosine adding window module（Raised cosine window is Nyquist
One kind of window）；It is R that interpolation filter uses the speed conversion factoraInterpolation low pass filter, Ra=2,3 or 5；Decimation filter is adopted
It is R with the speed conversion factoraExtract low pass filter, Ra=2,3 or 5；It is f that frequency mixer I and frequency mixer II use frequencycIt is mixed
Frequency device；Wherein fcFrom 0 hertz to 25 megahertzs.
Preferably, by changing the frequency of frequency mixer I and frequency mixer II, for realizing to digital front-end system center frequency point
Configuration；By changing the cascade sum of series interpolation multiple of the emitter interpolation filter, realization is matched somebody with somebody to emitter bandwidth
Put；By changing the cascade sum of series extracting multiple of the receiver decimation filter, the configuration of the receipts that achieve a butt joint machine bandwidth；Its
The bandwidth of middle emitter bandwidth and receiver is from 7.8 KHzs to 25 megahertzs；The value of interpolation multiple and extracting multiple is equal
With speed conversion factor RaIt is identical, Ra=2,3 or 5.
Preferably, by changing the filter order and every grade of exponent number of wave filter of receiver decimation filter, with reference to mistake
Sampling gain, for realizing different Out-of-band rejection effects.（Different Out-of-band rejection effect such as highests can achieve over 100
The Out-of-band rejection of decibel.）
A kind of realization side of digital front-end system for power line carrier communication that the present invention is provided based on another object
Method, it is theed improvement is that, methods described with digital front-end system include the transmitter and receiver that is communicated successively；Institute
Stating emitter includes the inverse Fourier transform module, adding window module I, interpolation filter, frequency mixer I and the digital-to-analogue that are communicated successively
Converter；The receiver includes the analog-digital converter, frequency mixer II, decimation filter, the adding window module ii that are communicated successively
And Fourier transform module；
The implementation method comprises the steps：
（1）Modulation symbol is input to analog signal is converted on emitter；
（2）Modulation symbol will be converted in analog signal input to receiver.
Preferably, the step（1）Comprise the steps：
A, modulation symbol are respectively mapped on subcarrier, and the equivalent of time domain is converted to by inverse Fourier transform resume module
Complex base band signal；
B, equivalent complex base band signal is carried out into raised cosine window windowing process, the band for reducing equivalent complex base band signal
Outer energy；Assuming that baseband sampling frequency is fs, by the equivalent complex base band signal after Nyquist window windowing process by M grades
The speed conversion factor be 2 interpolation low pass filter over-sampling to 2M·fs, wherein M is integer and 0≤M≤9；
C, the equivalent complex base band signal are again R by first-rate transformation factora, Ra=2,3 or 5 interpolation low pass filtered
Ripple device, the sample rate of equivalent complex base band signal is Ra·2M·fs；
D, the equivalent complex base band signal are f by carrier frequency pointcFrequency mixer to be up-converted into be digital band-pass signal；
E, the digital band-pass signal by digital band-pass signal after digital analog converter by being converted to analog signal.
Preferably, the step（2）Comprise the steps：
<1>The analog signal for being input to receiver is converted to digital band-pass signal by analog-digital converter；
<2>The digital band-pass signal turns into equivalent complex base band signal by frequency mixer II frequency conversions again；
<3>The equivalent complex base band signal is R by first-rate transformation factoraExtraction low pass filter and M grades
The speed conversion factor of cascade is 2 extraction low pass filter, it is down-sampled to sample frequency be fsEquivalent complex base band signal
Signal；
<4>Nyquist window adding window and Fourier's series treatment are performed to equivalent complex base band signal signal, is modulated
Symbol.
Compared with the prior art, the beneficial effect that reaches of the present invention is：
1st, present invention incorporates two kinds of advantages of technology of equivalent complex baseband and adding window：Support frequency band selection, support bandwidth
Configuration, suppression out-of-band interference, the outer energy of reduction sending signal band simultaneously suppress to be disturbed with interior arrowband.
2nd, the digital front-end system that the present invention is provided is by combining equivalent complex baseband method and changing digital mixer
Frequency, it is possible to achieve the configuration to system centre frequency, and then make system have the ability such as to be made an uproar according to power line communication channel situation
Sound and the situation of decay, select best center frequency point to be communicated.
3rd, the digital front-end system that the present invention is provided is by combining equivalent complex baseband method and changing digital cascade filtering
The cascade series or interpolation of device, extracting multiple, it is possible to achieve the configuration to system bandwidth, and then system is had the ability according to difference
Using, electric network composition and channel situation, most suitable system bandwidth is selected to be communicated.
4th, the receiver that the present invention is provided, by combining equivalent complex baseband method and changing the wave filter of cascading filter
The exponent number of every grade of wave filter of sum of series, with reference to over-sampling gain, it is possible to achieve different Out-of-band rejection effects.Highest can be realized surpassing
Cross the Out-of-band rejection of 100dB.
5th, the emitter that the present invention is provided, is sent outside the band of OFDM signal by the method reduction of adding window
Energy, so as to reduce the interference being likely to result in other systems.
6th, the emitter that the present invention is provided, when the interference being likely to result in radio station is reduced using notch technology, leads to
The method for crossing adding window, reduces the outer energy of band of each subcarrier sending signal, the sub-carrier number of trap can be made minimum, so as to improve
The availability of frequency spectrum.
7th, the receiver that the present invention is provided, is disturbed arrowband in band by the method for adding window and suppressed, can be in maximum
The influence to subcarrier reception performance adjacent thereto with the interference of interior arrowband is reduced in degree.
Brief description of the drawings
Fig. 1 is the digital front-end system structure chart that the present invention is provided；
Fig. 2 is the structure chart of emitter in the digital front-end system that the present invention is provided；
Fig. 3 is the structure example figure of emitter in the digital front-end system that the present invention is provided；
Fig. 4 is the structure chart of receiver in the digital front-end system that the present invention is provided；
Fig. 5 is the structure example figure of receiver in the digital front-end system that the present invention is provided；
Fig. 6 is the transmitter and receiver raised cosine window schematic diagram that the present invention is provided；
Fig. 7 is the overlapping schematic diagram of symbol after the adding window that the present invention is provided；
Fig. 8 is the equivalent complex baseband and window function integrated processes Out-of-band rejection performance map that the present invention is provided；
Fig. 9 is that the window function that the present invention is provided compares figure to AF panel in band.
Specific embodiment
Specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.
Digital front-end system structure chart that the present invention is provided is as shown in figure 1, including the emitter that is communicated successively and connect
Receipts machine；The structure chart of emitter is as shown in Fig. 2 including an inverse Fourier transform mould in the digital front-end system that the present invention is provided
Block, adding window module I, a series of interpolation filter of cascades, a frequency mixer I module and a digital analog converter（DAC）.
Wherein inverse Fourier transform module realizes modulation symbol to the conversion of the equivalent complex base band signal of time domain, and adding window module I is used for
The outer energy of band of equivalent complex base band signal is reduced, cascade interpolation filter substep improves the sampling of equivalent complex base band signal
Rate, frequency mixer I realizes equivalent complex base band signal to the conversion of bandpass signal, and digital analog converter is converted to band logical data signal
Analog signal.
Embodiment 1
The structure example figure of emitter is as shown in Figure 3 in the digital front-end system that the present invention is provided, it is possible to achieve center is frequently
O'clock selected between 0 hertz to 25 megahertzs, bandwidth is supported in 7.8 KHzs to flexible configuration between 10 megahertzs.
Under this implementation, the digital front-end structure of emitter includes an inverse Fourier transform（IFFT）Module,
One raised cosine window adding window module, speed conversion factor be 2 interpolation low pass filter, a speed conversion factor be 3
Interpolation low pass filter, the interpolation low pass filter that speed conversion factor is 5, a frequency be fcFrequency mixer and
Individual digital analog converter（DAC）.Using 4096 points of inverse Fourier transform module, modulation symbol is respectively mapped to subcarrier 1 to 410
On subcarrier 3687 to 4096, the equivalent complex base band signal for being converted to time domain is processed by inverse Fourier transform；Then enter
The windowing process of row raised cosine window is used to reduce the outer energy of band of equivalent complex base band signal.Assuming that baseband sampling frequency is fs, enter
The equivalent complex base band signal crossed after windowing process by interpolation low pass filter over-sampling that M stage speed transformation factors are 2 extremely
2M·fs, wherein M is integer and 0≤M≤9；Then, equivalent complex base band signal is again R by first-rate transformation factora（Ra
=2,3 or 5）Interpolation low pass filter, now the sample rate of equivalent complex base band signal be Ra·2M·fs；Finally, it is equivalent multiple
Base band signal is f by carrier frequency pointcIt is digital band-pass signal, digital band-pass signal warp that the frequency mixer of=9.5MHZ is up-converted into
Analog signal is converted to after crossing digital analog converter.
The structure chart of receiver is as shown in figure 4, including an analog-digital converter in the digital front-end system that the present invention is provided
（ADC）, frequency mixer II modules, a series of decimation filter of cascades, an adding window module ii and a Fourier transform
Module.Wherein analog-digital converter converts analog signals into digital band-pass signal, frequency mixer II realize digital band-pass signal to etc.
The conversion of complex base band signal is imitated, the decimation filter substep of cascade reduces the sample rate of equivalent complex base band signal, and adding window is used
In the interior arrowband interference of band for suppressing equivalent complex base band signal, Fourier transform module realizes equivalent complex base band signal to modulation
The conversion of symbol.
Embodiment 2
The structure example figure of receiver is as shown in figure 5, in this implementation in the digital front-end system that the present invention is provided
Under, the digital front-end structure of receiver includes a Fourier transform（FFT）Module, raised cosine window adding window module, one
The extraction low pass filter that extraction low pass filter that speed conversion factor is 2, speed conversion factor are 3, a speed
Conversion factor is 5 extraction low pass filter, and a frequency is fcFrequency mixer and an analog-digital converter（ADC）.Such as Fig. 5 institutes
Show, receiver performs inverse operations corresponding with transmitter.First, the input signal of receiving terminal（Analog signal）By analog-to-digital conversion
Device is converted to digital band-pass signal, then turns into equivalent complex base band signal by removing frequency under frequency mixer.Then, equivalent complex baseband
Signal is R by first-rate transformation factoraExtraction low pass filter and M grades cascade transformation factor be 2 extraction low pass
Wave filter, it is down-sampled to sample frequency be fsEquivalent complex base band signal.Finally, equivalent complex base band signal is performed and rises remaining
Porthole adding window and Fourier's series are processed, and obtain modulation symbol.
Transmitter architecture proposed by the present invention, by the outer energy of band of the method reduction sending signal of adding window；The present invention is carried
The receiver structure for going out, is disturbed arrowband in band by the method for adding window and suppressed.
Embodiment 3
The transmitter and receiver raised cosine window schematic diagram that the present invention is provided is as shown in fig. 6, Fig. 6 gives a kind of raised cosine
In the working method of transmitter and receiver, wherein window above is transmitting terminal raised cosine window, window below is receiving terminal liter to window
Cosine Window.Emitter produces a complete OFDM with Cyclic Prefix and cyclic suffix as shown in Figure 6
（OFDM）, symbol.The raised cosine window of receiver can utilize N5The Cyclic Prefix of individual sampled point, N5The cyclic suffix of individual sampled point
And the 2N in OFDM symbol5Individual sampled point improves demodulation performance, N5The Cyclic Prefix and N of point5The cyclic suffix of point will ensure
Do not influenceed by intersymbol interference.In addition, N1The Cyclic Prefix and cyclic suffix of individual sampled point are used for transmitting terminal raised cosine window,
For time-consuming expense, the OFDM symbol connected for two, the last N of previous OFDM symbol1Individual sampled point with it is latter
The beginning N of individual OFDM1Individual sampled point requirement is overlapping, as shown in Figure 7.The rolloff-factor definition of transmitter and receiver raised cosine window
For：
α _ Tx=N1/N ①；
α _ Rx=2N5/N ②；
Wherein, α _ Tx represents the rolloff-factor of emitter, and α _ Rx represents the rolloff-factor of receiving terminal, and N represents that Fourier becomes
Change/the points of inverse Fourier transform.Fig. 9 simulate when system occur between the 401st subcarrier and the 402nd subcarrier compared with
During strong single tone jamming, receiver to the suppression situation of this interference, as seen from Figure 9, after raised cosine window has been used, do by single-tone
Disturb the situation when the energy leakage of adjacent sub-carrier does not far smaller than use raised cosine window.
Receiver structure proposed by the present invention, by combining equivalent complex baseband method and changing the filtering of cascading filter
The exponent number of every grade of wave filter of device sum of series, with reference to over-sampling gain, it is possible to achieve different Out-of-band rejection effects.Highest can be realized
Out-of-band rejection more than 100dB, as shown in Figure 8.Fig. 8 gives the Out-of-band rejection performance of system realization, system centre frequency
It it is 9.5 megahertzs, with a width of 2.5 megahertzs, it can be seen that system realizes the decay close to 100dB to out of band signal.
Present invention also offers a kind of implementation method of the digital front-end system for power line carrier communication, the realization
Method comprises the steps：
（1）Modulation symbol is input to analog signal is converted on emitter；
A, modulation symbol are respectively mapped on subcarrier, and the equivalent of time domain is converted to by inverse Fourier transform resume module
Complex base band signal；
B, equivalent complex base band signal is carried out into raised cosine window windowing process, the band for reducing equivalent complex base band signal
Outer energy；Assuming that baseband sampling frequency is fs, by the equivalent complex base band signal after windowing process by M stage speeds convert because
Son is 2 interpolation low pass filter over-sampling to 2M·fs, wherein M is integer and 0≤M≤9；
C, the equivalent complex base band signal are again R by first-rate transformation factora, Ra=2,3 or 5 interpolation low pass filtered
Ripple device, the sample rate of equivalent complex base band signal is Ra·2M·fs；
D, the equivalent complex base band signal are f by carrier frequency pointcFrequency mixer to be up-converted into be digital band-pass signal；
E, the digital band-pass signal by digital band-pass signal after digital analog converter by being converted to analog signal.
（2）Modulation symbol will be converted in analog signal input to receiver：
<1>The analog signal for being input to receiver is converted to digital band-pass signal by analog-digital converter；
<2>The digital band-pass signal turns into equivalent complex base band signal by frequency mixer II frequency conversions again；
<3>The equivalent complex base band signal is R by first-rate transformation factoraExtraction low pass filter and M grades
The speed conversion factor of cascade is 2 extraction low pass filter, it is down-sampled to sample frequency be fsEquivalent complex base band signal
Signal；
<4>Raised cosine window adding window and Fourier's series treatment are performed to equivalent complex base band signal signal, modulation symbol is obtained
Number.
The present invention uses equivalent complex baseband technology, by adjusting the frequency of digital mixer, can move system
The good frequency range of channel condition（Such as selected in 30 KHzs to 20 megahertzs of frequency range）；By equivalent complex baseband
Different cascade exponent numbers and different interpolation/extraction yields realize the flexible configuration of system bandwidth in structure（Such as from 7.8 KHzs to 10
Configured in megahertz range）；By the low pass filter in equivalent complex baseband structure, with reference to over-sampling gain, can be with
The suppression of 100dB is achieved over to out-of-band interference, and then best effort Frequency Band Selection in big frequency range can be supported on.
On the basis of this, the method that the present invention has used adding window in time domain can reduce orthogonal frequency division multiplex OFDM and son in transmitting terminal
The leakage of the outer energy of band of carrier wave, so that the interference to other electric line communication systems is reduced, in addition, subtracting using notch technology
During the interference being likely to result in radio station less, the sub-carrier number of trap can be made minimum, so as to improve the availability of frequency spectrum.Connecing
Receiving end can to the full extent reduce energy leakage of the arrowband interference on subcarrier adjacent thereto, so as to reduce pair and its phase
The influence of adjacent subcarrier reception.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention rather than its limitations, to the greatest extent
Pipe has been described in detail with reference to above-described embodiment to the present invention, and those of ordinary skill in the art should be understood：Still
Specific embodiment of the invention can be modified or equivalent, and without departing from any of spirit and scope of the invention
Modification or equivalent, it all should cover in the middle of scope of the presently claimed invention.
Claims (4)
1. a kind of digital front-end system for power line carrier communication, it is characterised in that the digital front-end system include according to
The secondary transmitter and receiver for being communicated；The emitter includes the inverse Fourier transform module, the adding window that are communicated successively
Module I, interpolation filter, frequency mixer I and digital analog converter；The receiver include communicated successively analog-digital converter,
Frequency mixer II, decimation filter, adding window module ii and Fourier transform module；
The inverse Fourier transform module realizes conversion modulation symbol to the conversion of the equivalent complex base band signal of time domain；It is described to add
Window module I is used to reduce the outer energy of band of equivalent complex baseband quadrature frequency division multiplexing modulated signal and each subcarrier；The interpolation
Wave filter is cascade mode, the sample rate for improving equivalent complex base band signal step by step；The frequency mixer I realizes equivalent plural number
Conversion of the baseband signal to digital band-pass signal；The digital analog converter is used to for digital band-pass signal to be converted to analog signal；
The receiver realizes the operation opposite with emitter, and the analog-digital converter converts analog signals into number tape communication
Number；The frequency mixer II realizes digital band-pass signal to the conversion of equivalent complex base band signal；The decimation filter is cascade
Pattern, the sample rate for reducing equivalent complex base band signal step by step；The adding window module ii is used to suppress equivalent complex baseband
The interior arrowband interference of band of signal；The Fourier transform module realizes equivalent complex base band signal to the conversion of modulation symbol；
The input signal of the receiver is converted to digital band-pass signal by analog-digital converter, wherein, input signal is simulation
Signal；Digital band-pass signal turns into equivalent complex base band signal by frequency mixer II frequency conversions again；Equivalent complex base band signal passes through
First-rate transformation factor is RaExtraction low pass filter and M grades cascade the speed conversion factor be 2 extraction LPF
Device, it is down-sampled to sample frequency be fsEquivalent complex base band signal；Nyquist window adding window and Fourier transform processing are performed,
Obtain modulation symbol；Wherein fsFrom 1 KHz to 50 megahertzs；
Adding window module I and adding window module ii use raised cosine adding window module；It is f that frequency mixer I and frequency mixer II use frequencyc
Frequency mixer；Wherein fcFrom 0 hertz to 25 megahertzs；
By changing the frequency of frequency mixer I and frequency mixer II, for realizing the configuration to digital front-end system center frequency point；Pass through
Change the cascade sum of series interpolation multiple of the emitter interpolation filter, realize the configuration to emitter bandwidth；By changing
The cascade sum of series extracting multiple of the receiver decimation filter, the configuration of the receipts that achieve a butt joint machine bandwidth；Wherein transmitter strap
The bandwidth of wide and receiver is from 7.8 KHzs to 25 megahertzs；
By changing the filter order and every grade of exponent number of wave filter of receiver decimation filter, with reference to over-sampling gain, increase
The equivalent bit wide of addend weighted-voltage D/A converter, for realizing different Out-of-band rejection effects.
2. digital front-end system as claimed in claim 1, it is characterised in that the speed conversion factor Ra=2,3 or 5.
3. the implementation method of a kind of digital front-end system for power line carrier communication, it is characterised in that methods described
Digital front-end system includes the transmitter and receiver for being communicated successively；The emitter includes inverse Fu for being communicated successively
Vertical leaf transformation module, adding window module I, interpolation filter, frequency mixer I and digital analog converter；The receiver includes carrying out successively
The analog-digital converter of communication, frequency mixer II, decimation filter, adding window module ii and Fourier transform module；
The implementation method comprises the steps：
(1) modulation symbol is input to and analog signal is converted on emitter；
(2) modulation symbol will be converted in analog signal input to receiver；
The step (1) comprises the steps：
A, modulation symbol are respectively mapped on subcarrier, and the equivalent plural number of time domain is converted to by inverse Fourier transform resume module
Baseband signal；
B, equivalent complex base band signal is carried out into raised cosine window windowing process, for reducing equivalent complex baseband quadrature frequency division multiplexing
The outer energy of band of signal and each subcarrier；Assuming that baseband sampling frequency is fs, by equivalent after Nyquist window windowing process
Complex base band signal is by interpolation low pass filter over-sampling that M stage speed transformation factors are 2 to 2M·fs, wherein M be integer and
0≤M≤9；
C, the sample rate are 2M·fsEquivalent complex base band signal again by first-rate transformation factor be RaInterpolation low pass
Wave filter over-sampling is to Ra·2M·fs；
D, the sample rate are Ra·2M·fsEquivalent complex base band signal by carrier frequency point be fcFrequency mixer be up-converted into for
Digital band-pass signal；
E, the digital band-pass signal by digital band-pass signal after digital analog converter by being converted to analog signal；
The step (2) comprises the steps：
<1>The analog signal for being input to receiver is converted to digital band-pass signal by analog-digital converter；
<2>The digital band-pass signal turns into equivalent complex base band signal by frequency mixer II frequency conversions again；
<3>The equivalent complex base band signal is R by first-rate transformation factoraExtract what low pass filter and M grade were cascaded
The speed conversion factor is 2 extraction low pass filter, it is down-sampled to sample frequency be fsEquivalent complex base band signal；
<4>It is f to the sample frequencysEquivalent complex base band signal perform Nyquist window adding window and Fourier's series treatment,
Obtain modulation symbol.
4. the implementation method of digital front-end system as claimed in claim 3, it is characterised in that the interpolation low pass filter
Speed conversion factor Ra=2,3 or 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310091035.6A CN103259754B (en) | 2013-03-21 | 2013-03-21 | A kind of digital front-end system and its implementation for power line carrier communication |
| PCT/CN2013/084385 WO2014146416A1 (en) | 2013-03-21 | 2013-09-27 | Digital front-end system used for power line carrier communications and implementation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310091035.6A CN103259754B (en) | 2013-03-21 | 2013-03-21 | A kind of digital front-end system and its implementation for power line carrier communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103259754A CN103259754A (en) | 2013-08-21 |
| CN103259754B true CN103259754B (en) | 2017-06-23 |
Family
ID=48963457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310091035.6A Active CN103259754B (en) | 2013-03-21 | 2013-03-21 | A kind of digital front-end system and its implementation for power line carrier communication |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103259754B (en) |
| WO (1) | WO2014146416A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259754B (en) * | 2013-03-21 | 2017-06-23 | 国家电网公司 | A kind of digital front-end system and its implementation for power line carrier communication |
| CN103457638B (en) * | 2013-09-11 | 2015-04-22 | 大连理工大学 | Restraining device and restraining method for burst impulse noise of power line communication channel |
| CN106452504B (en) * | 2015-08-07 | 2019-08-06 | 国网智能电网研究院 | One kind being based on frequency customized multifrequency power line carrier communication network network online |
| CN105680905B (en) * | 2016-01-15 | 2018-05-22 | 中国空间技术研究院 | A kind of FM, PM signal carrier catching method suitable for arbitrary modulation degree |
| CN106656899A (en) * | 2016-12-29 | 2017-05-10 | 北京遥测技术研究所 | Method for realizing multicarrier VDE system modulation and demodulation of ship VDES system |
| CN106789824B (en) * | 2017-01-22 | 2020-04-14 | 东南大学 | Power windowing sending method suitable for UFMC (unidirectional flux modulation) waveform |
| CN107359905B (en) * | 2017-07-11 | 2021-07-23 | 吴泳澎 | Digital front end and frame detection method for frequency division power line carrier communication |
| CN112583754B (en) * | 2019-09-30 | 2022-05-10 | 华为技术有限公司 | Communication method and related device |
| CN113098814B (en) * | 2019-12-23 | 2022-11-29 | 北京神经元网络技术有限公司 | Signal processing method and device, communication system, electronic device, and storage medium |
| CN112260723A (en) * | 2020-10-23 | 2021-01-22 | 全球能源互联网研究院有限公司 | Fusion transmitting device, fusion receiving method, fusion system and fusion equipment |
| CN112615648B (en) * | 2020-12-02 | 2023-11-10 | 江苏芯云电子科技有限公司 | Accurate narrowband noise resistance method used in power line carrier communication Rx process |
| CN113644924A (en) * | 2021-01-26 | 2021-11-12 | 青岛鼎信通讯股份有限公司 | Signal receiving circuit applied to 10KV medium-voltage carrier system |
| CN117544183B (en) * | 2024-01-09 | 2024-04-02 | 航天科工空间工程网络技术发展(杭州)有限公司 | Forward intermediate frequency processing system and method supporting variable symbol rate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252570A (en) * | 2008-04-01 | 2008-08-27 | 北京天碁科技有限公司 | Multi-carrier receiver and signal processing method |
| CN102158456A (en) * | 2011-02-25 | 2011-08-17 | 钜泉光电科技(上海)股份有限公司 | Orthogonal frequency division multiplexing (OFDM)-based power line carrier communication system and fast Fourier transform (FFT) window position recovery method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4373977B2 (en) * | 2005-12-22 | 2009-11-25 | 株式会社東芝 | Wireless communication system and wireless device |
| CN102714508B (en) * | 2010-01-12 | 2015-05-06 | 联想创新有限公司（香港) | OFDM modulated wave transmitter apparatus, OFDM modulated wave transmission method, and program |
| CN102195916B (en) * | 2010-03-15 | 2014-07-09 | 清华大学 | Multi-receiver transmission method and system for orthogonal frequency division multiplexing (OFDM) signal |
| CN103259754B (en) * | 2013-03-21 | 2017-06-23 | 国家电网公司 | A kind of digital front-end system and its implementation for power line carrier communication |
| CN203166913U (en) * | 2013-03-29 | 2013-08-28 | 国家电网公司 | Power line carrier wave transmitter digital front-end |
| CN203166890U (en) * | 2013-03-29 | 2013-08-28 | 国家电网公司 | Power line carrier wave receiver digital front-end |
-
2013
- 2013-03-21 CN CN201310091035.6A patent/CN103259754B/en active Active
- 2013-09-27 WO PCT/CN2013/084385 patent/WO2014146416A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252570A (en) * | 2008-04-01 | 2008-08-27 | 北京天碁科技有限公司 | Multi-carrier receiver and signal processing method |
| CN102158456A (en) * | 2011-02-25 | 2011-08-17 | 钜泉光电科技(上海)股份有限公司 | Orthogonal frequency division multiplexing (OFDM)-based power line carrier communication system and fast Fourier transform (FFT) window position recovery method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014146416A1 (en) | 2014-09-25 |
| CN103259754A (en) | 2013-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103259754B (en) | A kind of digital front-end system and its implementation for power line carrier communication | |
| US8665695B2 (en) | Methods for transceiving data in multi-band orthogonal frequency division multiple access communications system and communications apparatuses utilizing the same | |
| EP2200244B1 (en) | Method and apparatus for multi-carrier frequency division multiplexing transmission | |
| CN106027439B (en) | To the method and receiver handled from the channel analog signal for sending channel | |
| CN103957182A (en) | Co-channel full-duplex system based on MPPSK modulation | |
| CN107070836A (en) | The design method of FBMC receive-transmit systems based on FRM technologies in a kind of 5G systems | |
| CN105429911B (en) | Without time and no frequency guard bands wireless multi-carrier communications method and device | |
| CN105553909B (en) | A kind of method that iteration limit filtration reduces ofdm signal peak-to-average force ratio | |
| CN107911327B (en) | FMT-based multi-carrier modulation and demodulation method and system for ship VDES system | |
| WO2022033028A1 (en) | Multi-channel signal wireless transmission system and physical resource grid distribution control method | |
| CN107317784A (en) | A kind of many band parallel filtering mixed carrier transmission methods | |
| CN101729134B (en) | Generalized multiple carrier frequency division multiple access transmission equipment based on orthogonal transformation processing | |
| CN102223223B (en) | The method of reseptance and device of multi-carrier signal | |
| CN102571653B (en) | Method for processing communication signals and communication receiver | |
| CN101557373B (en) | Method and device for transmitting and receiving signals based on subbands | |
| CN103067329B (en) | A kind of fast Fourier transform multi-band synthesis of chirp real signal and separation method | |
| CN108199998A (en) | A kind of anti-aliasing filter method, apparatus and programmable logic device | |
| CN100588146C (en) | System and method for sending and receiving QAM signal in low signal-noise ratio | |
| Wang et al. | Design and implementation of F-OFDM downstream filter | |
| CN110095791A (en) | A kind of multicarrier fsk modulated signal demodulation method | |
| CN109067689A (en) | The amplitude limit method of PART in a kind of F-OFDM communication system | |
| WO2014147482A1 (en) | Multi-band transmission system | |
| CN108809433A (en) | DCO-OFDM modulation, demodulation method and the device of phase-modulation is added | |
| CN108234378A (en) | A kind of anti-aliasing filter method, apparatus and programmable logic device | |
| CN108965184B (en) | Discrete multi-audio modulation multiplexing system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160511 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: China Electric Power Research Institute Applicant after: State Grid Smart Grid Institute Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: China Electric Power Research Institute |
|
| CB02 | Change of applicant information |
Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: China Electric Power Research Institute Applicant after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: China Electric Power Research Institute Applicant before: State Grid Smart Grid Institute |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |