CN107317604A - Suitable for the interrupted envelope carrier modulating method of power line channel - Google Patents
Suitable for the interrupted envelope carrier modulating method of power line channel Download PDFInfo
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- CN107317604A CN107317604A CN201710593476.4A CN201710593476A CN107317604A CN 107317604 A CN107317604 A CN 107317604A CN 201710593476 A CN201710593476 A CN 201710593476A CN 107317604 A CN107317604 A CN 107317604A
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- information
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- power line
- envelope
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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
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
Abstract
The invention discloses a kind of interrupted envelope carrier modulating method suitable for power line channel, belong to power line carrier communication field.In the present invention, source node is encoded to certain line signal first, and Source Significant Information replaces transmission with isolation information, and head/tail portion information of effective information is included in isolation information；Then source node dynamically adjusts the envelope shape of modulated signal according to the transmission rate of baseband signal, is then based on the modulation that this envelope realizes signal amplitude, phase, frequency；Last source node produces the interrupted baseband modulation signal of the corresponding synchronization of this road signal, and it is multiplied with the modulated signal that previous step is produced, can get Ci roads interrupted modulated signal.Institute's extracting method has well adapted to power line channel characteristic, with higher communication success rate, while having the higher availability of frequency spectrum, and the coding rule of isolation information ensure that does not lose information when signal is not exclusively synchronous, improves the robustness of communication.
Description
Technical field
The present invention relates to a kind of interrupted envelope carrier modulating method suitable for power line channel, belong to power line carrier and lead to
Letter and control field.
Background technology
In recent years, power-line carrier communication is progressively widely used in power information acquisition system, but by
It is a kind of transmission line of non-uniform Distribution in power line, is originally used only to transmit electric energy, different from traditional communications
Medium such as twisted-pair feeder, coaxial cable, optical fiber etc., the characteristic of channel of electric power networks are sufficiently complex.Channel is mainly reflected in exist by force
Time variation and multipath effect, with serious frequency dispersal and time selectivity；In the presence of a large amount of white noises, coloured noise and
Impulse disturbances；The impedance of circuit is small and impedance is as there are large change signal frequency and time, this decay to carrier signal
It is very serious.On the other hand, power information acquisition system proposes higher want to carrier communication transmission rate, propagation delay time etc.
Ask, and the frequency spectrum resource of power line carrier is very nervous, the spectrum efficiency for lifting power line carrier communication is extremely urgent.
In order to tackle the transmission environment that power line carrier communication is severe, the strengthened research for power information capturing service is provided
Solid physical layer communication environment, and further lift carrier communication spectrum efficiency.Ancient cooking vessel letter communication is to power line carrier communication
On the basis of channel characteristic and the further investigation of various modulation systems, the interrupted envelope carrier modulation of proposition (IECM,
Intermittent Envelope Carrier Modulation) method, result of field running shows, this method significant increase
Carrier communication success rate, and improve the power spectral density of signal, improve the spectrum efficiency of system.
The content of the invention
Power line carrier communication environment and its severe, based on the further investigation to power line communication environment, obtains power line
Interchannel noise, impedance, fading characteristics.In general, noise has time-varying characteristics and with all with alternating current under power line channel
Phase close periodicity trend, meanwhile, power line electric main zero-acrross ing moment noise is general weaker, and non-zero crossing moment noise becomes
Change and more enrich；Impedance ranges are changed greatly, and with cyclically-varying trend, zero-acrross ing moment has necessarily in non-zero-acrross ing moment
Difference is still in a period of time, and impedance variations are more stable, identical place, and each frequency variation tendency is more obvious；Signal declines
Subtract not only relevant with transmission range, the presence of the phenomenon such as standing wave, the transmitting of signal on power line and a large amount of branches makes signal
Decay and its complexity, decay also have certain cyclically-varying trend, and zero-acrross ing moment has differences in non-zero-acrross ing moment, but one
Attenuation change is more constant in the section time.
On the other hand, as electricity adopts the raising of business and its strengthened research to requirements such as carrier-wave transmission speed, propagation delay times,
Carrier system based on current carrier system research and development higher rate, more low time delay, more flexible attributes of network is extremely urgent.And it is real
The existing most direct mode of above-mentioned purpose is the frequency quantity of increase transmission information, but Most current modulation system has power spectrum
Density decay is slower, the problem of not high out-of-band power leakage of in-band signal power accounting is more serious, and this strongly limits multifrequency
The deployment effect of spot net, limits the development of power line carrier communication.
Based on above-mentioned analysis, a kind of interrupted envelope carrier modulating method is proposed, this method not only fabulous adaptation power line
Channel circumstance, and the power spectral density of signal is improved, out-of-band interference is reduced, heavily fortified point is provided for the deployment of multifrequency point network agile
Real basis.
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without having to pay creative labor, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Brief description of the drawings
Fig. 1 is put forward modulator approach base band-band signal waveform compares figure by the present invention；
Fig. 2 is modulator approach power spectral density plot of the present invention；
Fig. 3 is the interrupted modulator approach schematic diagram of the present invention；
Fig. 4 is each tributary signal waveform diagram of the interrupted modulator approach of the present invention；
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to accompanying drawing of the embodiment of the present invention,
Further clear, complete description is done to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is the present invention
One kind of embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
The every other embodiment obtained under the premise of creative work is made, the scope of protection of the invention is belonged to.
Analysis based on the further investigation to power line channel environment and more modulation technology, proposes a kind of interrupted envelope
Carrier modulating method.This method has well adapted to the noise of power line channel environment, impedance, attenuation characteristic, improves simultaneously
The power spectral density plot of signal, reduces the band external diffusion of signal energy, improves the reliability of carrier communication system with having
Effect property.Carried modulator approach is described as follows：
In order to adapt to power line carrier communication channel circumstance, source node does following coded treatment to information to be passed first.If
The cycle of electric main is Ts, the modulation rate of baseband signal is Rb, then for a certain bar carrier line, (information source sends chip most
It is many to support 3 tunnel line modulations simultaneously), information source is to taking-up every timeEffective information, is then transmitted againEvery
From information, wherein thisN number of bit is before it before isolation informationThe afterbody Nbit of effective information,
Nbit is behind belowThe head Nbit of effective information, center section information transfer all ones or all zeroes information.Afterwards
Information source is carried out in two steps modulation to this coding information, first using following modulation system：
Wherein fcRepresent carrier frequency, A cos (π RbT- pi/2s) and-A cos (π RbT- pi/2s) represent that baseband signal is respectively
Corresponding modulated signal envelope when 1/0, this envelope is dynamically adjusted according to the transmission rate of baseband signal, is then based on this envelope complete
Into signal amplitude, phase, frequency adjustment, and obtain the modulated signal S on i-th (i=1,2,3) roadI, mod_all.As shown in figure 1,
By above-mentioned modulator approach, make signal continuity is stronger especially to reduce signal Derivative on the left or on the right gap at symbol alternating, greatly
Improve power spectrum signal distribution situation.Using 2PSK modulation, as reference, during normal 2PSK modulation schemes, main lobe power accounting is about
For 90.5%, and suggested plans main lobe power accounting is about 96.9%.It can be seen that its band internal power accounting is significantly improved, greatly promote
The efficiency of transmission of signal, as can be seen from Figure 2, the power spectral density decay for signal of suggesting plans faster, so as to greatly reduce
Crosstalk between different frequency, the construction for multifrequency point carrier communication system provides solid foundation.
Based on above-mentioned modulated signal, source node is further discontinuously handled.Source node produces interrupted baseband modulation first
Signal, this interrupted baseband modulation signal makes full use of voltage Power Line Carrier Channel noise, impedance, attenuation characteristic, can effectively avoid
Power line channel noise is severe, impedance and at the time of decay unstable.Discontinuously the cycle of baseband modulation signal isThen the i-th (i
=1,2,3) expression formula of the interrupted baseband modulation signal a cycle in road is as follows：
To above formula carry out periodic extension, can get Mou roads interrupted baseband modulation signalSource
Nodal exactness control continuous modulation signal is synchronous with interrupted baseband modulation signal, and both, which are multiplied, can obtain the interrupted modulation of this circuit
Signal, modulated process is as shown in Figure 3；I-th tunnel transmission signal expression is Smod_i=SI, mod_all*seli(t), its transmitted waveform
As shown in Figure 4.By discontinuously modulating so that the fabulous power line channel environment that adapted to of carrier communication improves communication success rate.
On the other hand, it is above-mentioned carried to a certain when the interrupted baseband modulation signal on this road is not exclusively synchronous with continuous carrier signal
The coding rule of road information so that isolation information part includes the partial information of front and rear effective information, then what is now obtained is interrupted
Modulated signal will not also lose effectively transmission information, greatly improve the robustness of transmission.
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
The present invention is described in detail with reference to the foregoing embodiments for pipe, it will be understood by those within the art that；It is still
Technical scheme described in previous embodiment can be modified, or equivalent substitution is carried out to which part technical characteristic；
And these modifications or replacement, the essence of appropriate technical solution is departed from the spirit and model of technical scheme of the embodiment of the present invention
Enclose.
Claims (1)
1. a kind of interrupted envelope carrier modulating method suitable for power line channel.It is characterized in that：Information source is first in institute's extracting method
First a certain line information to be passed is encoded, encoded as follows：Information source is to taking-up every timeIndividual bit, is then transmitted againIsolation information, wherein thisBefore N number of bit for before itAfterbody Nbit, behind
Nbit is behindHead Nbit, center section information transfer all ones or all zeroes information；Information source is according to baseband signal
Transmission rate dynamically adjustment modulated signal envelope shape, be then based on this envelope realize to this road coding information amplitude, phase
Position, the adjustment of frequency；Further, source node produces interrupted baseband modulation signal for this road signal, by this signal and generation
Continuous carrier signal multiplication can obtain interrupted modulated signal；Source node, which sends chip, can accurately control the time synchronized of two signals,
On the other hand, the coding method of isolation information part so that when both are not exclusively synchronous, obtained interrupted modulated signal is not lost
Effective information, improves the robustness of communication.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221677A (en) * | 2021-11-25 | 2022-03-22 | 国网山东省电力公司营销服务中心(计量中心) | Power line carrier modulation system and method based on channel state self-adaptive adjustment |
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| EP1168273A2 (en) * | 2000-06-27 | 2002-01-02 | Oxley Developments Company Limited | Device controller and control arrangement |
| CN101167322A (en) * | 2005-04-29 | 2008-04-23 | 索尼德国有限责任公司 | Transmitting device, receiving device and communication method for an OFDM communication system with new preamble structure |
| CN101409956A (en) * | 2008-11-28 | 2009-04-15 | 清华大学 | Honeycomb district identification method for wideband wireless mobile communication |
| CN102195679A (en) * | 2010-03-10 | 2011-09-21 | 青岛东软载波科技股份有限公司 | Power line carrier modulation method, demodulation method, circuit and chip |
| CN103179067A (en) * | 2013-03-07 | 2013-06-26 | 西安理工大学 | Multi-system digital communication carrier modulation method |
| CN104954311A (en) * | 2015-05-25 | 2015-09-30 | 深圳市力合微电子股份有限公司 | Method for generating leading signals of power line carrier communication systems on basis of OFDM (orthogonal frequency division multiplexing) modulation |
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2017
- 2017-07-15 CN CN201710593476.4A patent/CN107317604A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1168273A2 (en) * | 2000-06-27 | 2002-01-02 | Oxley Developments Company Limited | Device controller and control arrangement |
| CN101167322A (en) * | 2005-04-29 | 2008-04-23 | 索尼德国有限责任公司 | Transmitting device, receiving device and communication method for an OFDM communication system with new preamble structure |
| CN101409956A (en) * | 2008-11-28 | 2009-04-15 | 清华大学 | Honeycomb district identification method for wideband wireless mobile communication |
| CN102195679A (en) * | 2010-03-10 | 2011-09-21 | 青岛东软载波科技股份有限公司 | Power line carrier modulation method, demodulation method, circuit and chip |
| CN103179067A (en) * | 2013-03-07 | 2013-06-26 | 西安理工大学 | Multi-system digital communication carrier modulation method |
| CN104954311A (en) * | 2015-05-25 | 2015-09-30 | 深圳市力合微电子股份有限公司 | Method for generating leading signals of power line carrier communication systems on basis of OFDM (orthogonal frequency division multiplexing) modulation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114221677A (en) * | 2021-11-25 | 2022-03-22 | 国网山东省电力公司营销服务中心(计量中心) | Power line carrier modulation system and method based on channel state self-adaptive adjustment |
| CN114221677B (en) * | 2021-11-25 | 2023-08-22 | 国网山东省电力公司营销服务中心(计量中心) | Power line carrier modulation system and method based on channel state self-adaptive adjustment |
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Application publication date: 20171103 |