CN104954112B - A kind of across frequency band power line carrier frequencies cognitive approach based on thin frequency granularity - Google Patents
A kind of across frequency band power line carrier frequencies cognitive approach based on thin frequency granularity Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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Abstract
The present invention relates to a kind of across frequency band power line carrier frequencies cognitive approach based on thin frequency granularity, including：Build power-line carrier communication system model；Working frequency is divided into low frequency, intermediate frequency and high frequency and according to thin frequency granularity feature, obtains the thin frequency granularity sub-band of low frequency, the thin frequency granularity sub-band of intermediate frequency and the thin frequency granularity sub-band of high frequency；Measure the power line channel noise of main website and slave station；Calculate the power line channel attenuation of uplink and downlink；Calculate the link-quality instruction LQI of uplink and downlink；Link-quality is set to indicate threshold value, obtains and can use thin frequency granularity sub-band, and spectrum aggregating is carried out to available thin frequency granularity sub-band；Can by plc communication frequency resource across frequency band expansion, the different frequency bands such as low frequency, intermediate frequency, high frequency are carried out with the cognition of thin frequency granularity respectively, so that PLC can fully search communication frequency and can establish stable communication link under exceedingly odious channel condition.
Description
Technical field
The present invention relates to field of power communication, and in particular to a kind of across frequency band power line carrier based on thin frequency granularity
Frequency cognitive approach.
Background technology
Power line carrier communication (Power Line Communication, PLC) technology is that a kind of utilization power circuit is made
Carry out the communication mode of transmitting data information for telecommunication media, conventional power line communication technology be on existing power circuit,
High-frequency carrier signal of the loading through ovennodulation communicates, and therefore, power line communication is normally referred to as power line carrier communication.It presses
According to the voltage class of carrier communication circuit, PLC technology generally comprises：The ultra-high-tension power transmission line of 35kV and above is made
For the high-tension electricity line carrier communication of telecommunication media, using the middle pressure transmission line of 10kV voltage class as the middle pressure of telecommunication media
Power line carrier communication and using the low-voltage electricity transmission line of 380/220V voltage class as telecommunication media low-voltage power line carry
Wave communication.
At present, the PLC technology of conventional smart grid-oriented application is operated in prespecified frequency range, typically
The 2-30MHz of 30-500kHz including narrowband PLC, broadband PLC.Traditional narrow PLC is easily achieved, but transmission rate is low, anti-dry
It is weak to disturb ability；Broadband PLC transmission rates are high, can bearer service it is more, but often single-hop communication distance is limited.In fact, noise, declining
Subtract and wait power line channels characteristic that there is significant frequency selectivity feature, and it is special by topological structure of electric, line characteristic and load
The factors such as point influence, and show otherness relevant with region and unpredictability.Practical application shows that PLC uses single work
Working frequency, it is difficult to realize all standing under different channels condition, application scenarios, easily cause communication blind spot, link stability
The communication requirement of intelligent grid business can not be met.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of across frequency band power line carrier frequency based on thin frequency granularity
Rate cognitive approach, by plc communication frequency resource across frequency band expansion, to the different frequency bands such as low frequency, intermediate frequency, high frequency respectively into
The cognition of the thin frequency granularity of row, so that PLC can fully search can communication frequency under exceedingly odious channel condition
And stable communication link is established, the ability that PLC flexibly tackles differentiation power line channel environment is improved, has adapted to PLC skills
The developing direction in art future.
The purpose of the present invention is what is realized using following technical proposals：
A kind of across frequency band power line carrier frequencies cognitive approach based on thin frequency granularity, it is improved in that bag
It includes：
(1) the power-line carrier communication system model being made of main website, slave station, uplink and downlink is built；
(2) working frequency is divided into low frequency, intermediate frequency and high frequency；
(3) according to the thin frequency granularity feature of low frequency, intermediate frequency and high frequency, respectively to the bandwidth of low frequency, intermediate frequency and high frequency
It is divided in a manner of being overlapped or is nonoverlapping；
(4) the thin frequency granularity sub-band of low frequency, the thin frequency granularity sub-band of intermediate frequency and the thin frequency particle of high frequency are obtained
Spend sub-band；
(5) power line channel noise of the main website and the slave station under current time and working frequency is measured respectively；
(6) the power line channel attenuation of the uplink under current time and working frequency and the downlink are calculated respectively
The power line channel attenuation of link；
(7) link-quality of the uplink and the downlink under current time and working frequency is calculated respectively to refer to
Show LQI；
(8) link-quality is set to indicate threshold value, obtains current time and thin frequency granularity sub-band whole frequency point pair
The uplink and the link-quality instruction LQI of the downlink answered are respectively less than the link-quality instruction threshold value
Thin frequency granularity sub-band can be used, and spectrum aggregating is carried out with thin frequency granularity sub-band to described.
Preferably, in the step (1), main website is a PLC device in PLC system, and slave station is adjacent with main website
One PLC device, uplink for the slave station to the main website direction link, downlink for the main website to it is described from
It stands the link in direction.
Preferably, in the step (2), the Frequency is 30kHz to 500kHz, and the IF frequency is 500kHz
To 1.6MHz, the higher frequency is 1.6MHz to 30MHz.
Preferably, in the step (3), the thin frequency granularity feature of the low frequency, intermediate frequency and high frequency includes：Low frequency is thin
Frequency granularity is characterized as the thin frequency granularity sub-band width of low frequency as 1kHz to 10kHz, the thin frequency granularity feature of intermediate frequency
It is 10kHz to 100kHz for the thin frequency granularity sub-band width of intermediate frequency, the thin frequency granularity of high frequency is characterized as the thin frequency of high frequency
Granularity sub-band width is 100kHz to 1MHz.
Preferably, in the step (5), the main website and the slave station under current time and working frequency are measured respectively
Power line channel noise, including：
Measurement Resolution bandwidth is 1kHz to 30kHz, the main website and the slave station under current time and working frequency
Power line channel noise formula is：
In formula (1-1), Noiseave(t) average value of the noise measurement obtained for t moment n times measurement, N ∈ (1,
10), Noiseave(t-1) it is N-1 average value for measuring obtained noise measurement of t-1 moment, Noisemeas(t) be t when
Carve the noise power that measurement obtains.
Preferably, in the step (6), the power line channel of the downlink under current time and working frequency is calculated
Attenuation, including：Using the main website as transmitting terminal, swept-frequency signal is sent to by the slave station as receiving terminal, the transmitting terminal
Receiving terminal；The swept-frequency signal intensity that the power line channel of the downlink decays to transmitting terminal transmission subtracts reception termination
The signal strength of receipts.
Preferably, in the step (6), the power line channel of the uplink under current time and working frequency is calculated
Attenuation, including：Using the slave station as transmitting terminal, swept-frequency signal is sent to by the main website as receiving terminal, the transmitting terminal
Receiving terminal；The swept-frequency signal intensity that the power line channel of the uplink decays to transmitting terminal transmission subtracts reception termination
The signal strength of receipts.
Preferably, in the step (7), calculate respectively under current time and working frequency the uplink and it is described under
The link-quality instruction LQI of line link, including：
The power line channel of power line channel noise+uplink of the link-quality instruction LQI=main websites of uplink
Attenuation；
The power line channel of power line channel noise+downlink of the link-quality instruction LQI=slave stations of downlink
Attenuation.
Preferably, in the step (8), the link-quality instruction threshold value is：The current time and working frequency
Under the link-quality of the uplink and the downlink instruction LQI minimum value add 5-15dB.
Preferably, in the step (8), spectrum aggregating is carried out with thin frequency granularity sub-band to described, including：
Respectively to the thin frequency granularity sub-band of the low frequency, the thin frequency granularity sub-band of intermediate frequency and the thin frequency of high frequency
Described in granularity sub-band carries out spectrum aggregating in frequency band with thin frequency granularity sub-band；
To that can use described in the thin frequency granularity sub-band of the low frequency and the thin frequency granularity sub-band of the intermediate frequency
Thin frequency granularity sub-band carries out across band spectrum polymerization；
To that can use described in the thin frequency granularity sub-band of the intermediate frequency and the thin frequency granularity sub-band of the high frequency
Thin frequency granularity sub-band carries out across band spectrum polymerization.
Beneficial effects of the present invention：
(1) a kind of across frequency band power line carrier frequencies cognitive approach based on thin frequency granularity proposed by the present invention, energy
It is enough by the range of choice of PLC working frequencies expand to across frequency band, covered from tens kHz to tens megahertzs low frequency, in
Frequency and high-frequency band, have broken the segmentation in traditional PLC working frequencies narrowband and broadband, have improved the spirit of frequency efficiency and selection
Activity.
(2) different frequency bands such as low frequency, intermediate frequency and high frequency are each divided into the son for meeting thin frequency granularity feature
Frequency band realizes finer frequency cognition so that under exceedingly odious channel condition, can also ensure that plc communication accesses.
(3) on the basis of PLC master station, slave station measure power line channel noise, attenuation, link-quality is introduced
It indicates the important parameter index that LQI is recognized as power line carrier frequencies, the channel quality at different frequency can be objectively responded,
Principle is simple, is easily achieved.
(4) indicate that the available thin frequency granularity sub-band of LQI thresholdings is aggregating by the way that link-quality will be met, realize
Multiband parallel transmission improves enabling capabilities of the PLC to intelligent grid business.
(5) the two-way asymmetry of power line channel is considered, is supported to slave station to main website uplink, main website to slave station
Downlink recognizes the suitable working frequency of selection respectively.
(6) scene of multiple PLC node networkings can be further expanded to, it is suitable by being selected for each of the links cognition
Working frequency effectively increases the covering performance of PLC network, it can be achieved that multifrequency networking.
Description of the drawings
Fig. 1 is a kind of across frequency band power line carrier frequencies cognitive approach flow chart based on thin frequency granularity of the present invention；
Fig. 2 is power-line carrier communication system structure diagram；
Fig. 3 is power-line carrier communication system model schematic；
Fig. 4 is across frequency band PLC working frequencies range of choice schematic diagram；
Fig. 5 is the thin frequency granularity sub-band knot for meeting thin frequency granularity feature with the model split not overlapped each other
Fruit schematic diagram；
Fig. 6 is the result schematic diagram for measuring local channel noise；
Fig. 7 is measurement fading channel result schematic diagram；
Fig. 8 is to calculate link-quality instruction LQI result schematic diagrams；
Fig. 9 is to obtain to can use thin frequency granularity sub-band schematic diagram according to LQI thresholdings；
Figure 10 is available thin frequency granularity sub-band spectra polymerization schematic diagram；
Figure 11 is that a kind of across frequency band power line carrier frequencies cognitive approach based on thin frequency granularity of the present invention implements stream
Journey schematic diagram.
Specific embodiment
It elaborates below in conjunction with the accompanying drawings to the specific embodiment of the present invention.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The all other embodiment obtained without making creative work, belongs to the scope of protection of the invention.
A kind of across frequency band power line carrier frequencies cognitive approach based on thin frequency granularity provided by the invention, such as Fig. 1
It is shown, including：
(1) the power-line carrier communication system model being made of main website, slave station, uplink and downlink is built；
Wherein, main website is a PLC device in PLC system, and slave station is a PLC device adjacent with main website, uplink
Link is the link of the slave station to the main website direction, and downlink is the link in the main website to the slave station direction.
Such as：As shown in Fig. 2, power-line carrier communication system is by carrier telecommunication and power line channel two
It is grouped into.Carrier telecommunication is responsible for coupling and extraction of the high-frequency carrier signal on power line, and power line channel is
By the electric power networks formed comprising a plurality of power circuit and various electric power facilities and electrical equipment, although actual PLC network structure
Two complex but adjacent PLC devices can regard the topological structure of point-to-point as, and provide that a wherein PLC is set
Standby is main website, and in addition a PLC device is slave station.It is attached between main website and slave station by power line channel, main website to slave station
The link in direction is known as downlink, and the link in slave station to main website direction is known as uplink.
As shown in figure 3, the high-frequency carrier signal that the PLC device being linked into power line network is sent passes through power line channel
It is transmitted.Signal can generate attenuation when being transmitted on power line channel, meanwhile, various noises and interference signal meeting in power grid
It is added in carrier signal, the intermediate waves radio signal in space can also be coupled on asymmetric power line, form narrowband and do
It disturbs.All these noises, attenuation are respectively provided with frequency selectivity, and topological structure with different location power grid, line characteristic, load
The factors such as feature are closely related, and the PLC system performance of the fixed working frequency pattern of tradition is impacted.
(2) working frequency is divided into low frequency, intermediate frequency and high frequency；
Wherein, the Frequency be 30kHz to 500kHz, the IF frequency be 500kHz to 1.6MHz, the height
Frequent rate is 1.6MHz to 30MHz.
The range of choice of PLC working frequencies is expanded to from tens kHz to tens megahertzs and, across frequency band, is covered
The different frequency bands such as low frequency, intermediate frequency and high frequency so as to break the segmentation of the frequency of traditional PLC narrowbands, broadband, improve the frequency that can communicate
Rate resource utilization and the flexibility of frequency selection；
Such as：As shown in figure 4, across the frequency band PLC working frequencies range of choice from 150kHz to 11.6MHz, wherein covering
The low-frequency band of 150kHz to 500kHz, the height of the medium-frequency band and 1.6MHz of 500kHz to 1.6MHz to 11.6MHz is again and again
Band.
(3) according to the thin frequency granularity feature of low frequency, intermediate frequency and high frequency, respectively to the bandwidth of low frequency, intermediate frequency and high frequency
It is divided in a manner of being overlapped or is nonoverlapping；
Wherein, the thin frequency granularity feature of the low frequency, intermediate frequency and high frequency includes：The thin frequency granularity of low frequency is characterized as
The thin frequency granularity sub-band width of low frequency is 1kHz to 10kHz, and the thin frequency granularity of intermediate frequency is characterized as the thin frequency particle of intermediate frequency
It is 10kHz to 100kHz to spend sub-band width, and the thin frequency granularity of high frequency is characterized as the thin frequency granularity sub-band width of high frequency
For 100kHz to 1MHz.
In view of power line channel low frequency, intermediate frequency and high frequency band bandwidth, the characteristic of channel, suitable environment etc. difference
It is different, the different frequency bands such as low frequency, intermediate frequency and high frequency are each divided into the sub-band for meeting thin frequency granularity feature,
In, it can be overlapped between the sub-band divided, it can also not overlap each other；
Such as：As shown in figure 5, by the low-frequency band of the common 350kHz bandwidth of 150kHz to 500kHz, draw with not overlapping each other
It is divided into using 10kHz as the thin frequency granularity sub-band width of low frequency, amounts to the thin frequency granularity sub-band of 35 low frequencies；It will
The medium-frequency band of the common 1.1MHz bandwidth of 500kHz to 1.6MHz is divided into using 55kHz as the thin frequency of intermediate frequency with not overlapping each other
Granularity sub-band width amounts to the thin frequency granularity sub-band of 20 intermediate frequencies；By the common 10MHz bandwidth of 1.6MHz to 11.6MHz
High frequency band is divided into using 500kHz as the thin frequency granularity sub-band width of high frequency with not overlapping each other, and amounts to 20 high frequencies
Thin frequency granularity sub-band.
(4) the thin frequency granularity sub-band of low frequency, the thin frequency granularity sub-band of intermediate frequency and the thin frequency particle of high frequency are obtained
Spend sub-band；
(5) power line channel noise of the main website and the slave station under current time and working frequency is measured respectively；
It makes an uproar specifically, measuring the power line channel of the main website and the slave station under current time and working frequency respectively
Sound, including：
Measurement Resolution bandwidth is 1kHz to 30kHz, the main website and the slave station under current time and working frequency
Power line channel noise formula is：
In formula (1-1), Noiseave(t) average value of the noise measurement obtained for t moment n times measurement, N are measurement
Number, N ∈ (1,10), Noiseave(t-1) it is N-1 average value for measuring obtained noise measurement of t-1 moment,
Noisemeas(t) noise power obtained for t moment measurement.
Such as：Main website and slave station are according to order from low to high, respectively to low frequency (150-500kHz), intermediate frequency
The local channel noise of (500kHz-1.6MHz) and high frequency (1.6-11.6MHz) measures, according to formula (1-1) with 10kHz
Resolution bandwidth (Resolution Band-Width, RBW) carries out, and improves measurement in a manner that multiple measurement is averaged
As a result accuracy, the measurement result of PLC slave station noises are as shown in Figure 6；
(6) the power line channel attenuation of the uplink under current time and working frequency and the downlink are calculated respectively
The power line channel attenuation of link；
Wherein, the power line channel attenuation of the downlink under current time and working frequency is calculated, including：By described in
Swept-frequency signal is sent to receiving terminal by main website as transmitting terminal, the slave station as receiving terminal, the transmitting terminal；The downlink chain
The swept-frequency signal intensity that the power line channel on road decays to transmitting terminal transmission subtracts receiving terminal received signal intensity.
The power line channel attenuation of the uplink under current time and working frequency is calculated, including：By the slave station
As transmitting terminal, swept-frequency signal is sent to receiving terminal by the main website as receiving terminal, the transmitting terminal；The uplink
The swept-frequency signal intensity that power line channel decays to transmitting terminal transmission subtracts receiving terminal received signal intensity.
Main website is considered to slave station downlink and slave station to the asymmetry of main website uplink, and measurement two-way channel declines
Subtract, fading channel measurement result is obtained using the method being averaged repeatedly is measured, and PLC master station to slave station downlink channel declines
The measurement result subtracted is as shown in Figure 7；
(7) link-quality of the uplink and the downlink under current time and working frequency is calculated respectively to refer to
Show LQI；
Wherein, the link-quality of the uplink and the downlink under current time and working frequency is calculated respectively
Indicate LQI, including：
The power line channel of power line channel noise+uplink of the link-quality instruction LQI=main websites of uplink
Attenuation；
The power line channel of power line channel noise+downlink of the link-quality instruction LQI=slave stations of downlink
Attenuation.
Further, link-quality instruction LQI is represented at sometime a certain frequency, is existed according to current resolution bandwidth
When receiving terminal reaches 0dB signal-to-noise ratio, transmitting signal power that transmitting terminal is needed at the frequency.LQI is smaller, represents in the frequency
It is better to locate channel quality, and LQI is unrelated with transmitting terminal transmitting signal power, can objectively respond the power line at different frequency and carry
Ripple channel quality is the important parameter index for realizing power line carrier frequencies cognition.Meanwhile transmitting terminal is actual at the frequency
Transmitting signal power subtracts LQI, you can obtains the signal-to-noise ratio of receiving terminal, as shown in Figure 8；
(8) link-quality is set to indicate threshold value, obtains current time and thin frequency granularity sub-band whole frequency point pair
The uplink and the link-quality instruction LQI of the downlink answered are respectively less than the link-quality instruction threshold value
Thin frequency granularity sub-band can be used, and spectrum aggregating is carried out with thin frequency granularity sub-band to described.
Wherein, the link-quality instruction threshold value is：Under the current time and working frequency the uplink and
The minimum value of the link-quality instruction LQI of the downlink adds 5-15dB.
Main website is directed to the LQI of uplink, and slave station is directed to the LQI of downlink, sets suitable LQI thresholdings respectively, and
Whether to meet LQI thresholdings and preferably go out uplink, the thin frequency granularity usable subband of downlink respectively as standard, if
When the LQI of all frequency points is respectively less than LQI thresholdings in certain sub-band, which is that the thin frequency granularity preferably gone out can use son frequency
Band.The LQI of downlink is calculated according to attached drawing 6, the power line channel noise of attached drawing 7, attenuation measurements, and according to LQI
Limit, which obtains, can use thin frequency granularity sub-band, as shown in Figure 9；
The thin frequency granularity usable subband preferably gone out is polymerize by main website, slave station by spectrum aggregating technology respectively
Come, multiband parallel transmission channels are built, so as to effectively improve the availability of frequency spectrum of PLC, traffic rate and band width configuration
Flexibility, meet the transmission demand of the intelligent grid business higher to requirement of real-time.Meanwhile consider low frequency, intermediate frequency, high frequency
Frequency band the thin frequency granularity sub-band bandwidth, the characteristic of channel, suitable environment each divided etc. difference, it is specified that right
It is described to carry out spectrum aggregating with thin frequency granularity sub-band, as shown in Figure 10, including：
Respectively to the thin frequency granularity sub-band of the low frequency, the thin frequency granularity sub-band of intermediate frequency and the thin frequency of high frequency
Described in granularity sub-band carries out spectrum aggregating in frequency band with thin frequency granularity sub-band；
To that can use described in the thin frequency granularity sub-band of the low frequency and the thin frequency granularity sub-band of the intermediate frequency
Thin frequency granularity sub-band carries out across band spectrum polymerization；
To that can use described in the thin frequency granularity sub-band of the intermediate frequency and the thin frequency granularity sub-band of the high frequency
Thin frequency granularity sub-band carries out across band spectrum polymerization.
According to step (1) to (8), a kind of across frequency band power line carrier based on thin frequency granularity provided in this embodiment
Frequency cognitive approach implementing procedure, as shown in figure 11, including：
Main website actively initiates frequency cognitive process, and sends the time of noise testing frame specifying measurement local channel noise,
Transmission ACK is confirmed to main website after slave station completes noise testing, and main website starts local channel noise testing until completing；
Main website sends attenuation measurement frame and starts downlink attenuation measurement, and slave station sends ACK and confirms that main website main website receives
Downlink attenuation measurement is carried out after ack signal.Slave station sends the startup uplink attenuation of attenuation measurement frame and surveys after measurement
Amount, main website send ACK and confirm to slave station, and slave station carries out uplink attenuation measurement after receiving ack signal；
After the completion of noise, attenuation measurement, slave station carries out downlink LQI calculating, preferably goes out the available thin frequency of downlink
Rate granularity sub-band completes spectrum aggregating, and the downlink operation frequency information most determined at last feeds back to main website.Main website
Uplink LQI calculating is carried out after receiving information, preferably goes out the available thin frequency granularity sub-band of uplink, completes frequency spectrum
Polymerization, and the uplink working frequency information most determined at last feeds back to slave station.Slave station receive send after information ACK confirm to
Main website, so as to complete the cognition of the frequency of uplink and downlink link between PLC master station, slave station.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Pipe is described in detail the present invention with reference to above-described embodiment, those of ordinary skills in the art should understand that：Still
The specific embodiment of the present invention can be modified or replaced equivalently, and without departing from any of spirit and scope of the invention
Modification or equivalent substitution should all cover within the claims of the present invention.
Claims (10)
1. a kind of across frequency band power line carrier frequencies cognitive approach based on thin frequency granularity, which is characterized in that including following
Step：
(1) the power-line carrier communication system model being made of main website, slave station, uplink and downlink is built；
(2) working frequency is divided into low frequency, intermediate frequency and high frequency；
(3) according to the thin frequency granularity feature of low frequency, intermediate frequency and high frequency, respectively to the bandwidth of low frequency, intermediate frequency and high frequency with weight
Folded or nonoverlapping mode is divided；
(4) the thin frequency granularity sub-band of low frequency, the thin frequency granularity sub-band of intermediate frequency and thin frequency granularity of high frequency are obtained
Frequency band；
(5) power line channel noise of the main website and the slave station under current time and working frequency is measured respectively；
(6) the power line channel attenuation of the uplink under current time and working frequency and the downlink are calculated respectively
Power line channel attenuation；
(7) link-quality of the uplink and the downlink under current time and working frequency is calculated respectively to indicate
LQI；
(8) link-quality is set to indicate threshold value, obtains current time and thin frequency granularity sub-band whole frequency point is corresponding
The link-quality of the uplink and downlink instruction LQI is respectively less than the available of the link-quality instruction threshold value
Thin frequency granularity sub-band, and to described spectrum aggregating is carried out with thin frequency granularity sub-band.
2. the method as described in claim 1, which is characterized in that in the step (1), main website is a PLC in PLC system
Equipment, slave station are a PLC device adjacent with main website, and uplink is link of the slave station to the main website direction, under
Line link is the link in the main website to the slave station direction.
3. the method as described in claim 1, which is characterized in that in the step (2), the Frequency for 30kHz extremely
500kHz, the IF frequency are 500kHz to 1.6MHz, and the higher frequency is 1.6MHz to 30MHz.
4. the method as described in claim 1, which is characterized in that in the step (3), the thin frequency granularity feature of low frequency
It is 1kHz to 10kHz for the thin frequency granularity sub-band width of low frequency, the thin frequency granularity of intermediate frequency is characterized as the thin frequency of intermediate frequency
Rate granularity sub-band width is 10kHz to 100kHz, and the thin frequency granularity of high frequency is characterized as the thin frequency granularity of high frequency
Sub-band width is 100kHz to 1MHz.
5. the method as described in claim 1, which is characterized in that in the step (5), measure current time and work frequency respectively
The power line channel noise of the main website and the slave station under rate, including：
Measurement Resolution bandwidth be 1kHz to 30kHz, the electric power of the main website and the slave station under current time and working frequency
Line interchannel noise formula is：
<mrow>
<msub>
<mi>Noise</mi>
<mrow>
<mi>a</mi>
<mi>v</mi>
<mi>e</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>Noise</mi>
<mrow>
<mi>m</mi>
<mi>e</mi>
<mi>a</mi>
<mi>s</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
</mrow>
<mi>N</mi>
</mfrac>
<mo>+</mo>
<msub>
<mi>Noise</mi>
<mrow>
<mi>a</mi>
<mi>v</mi>
<mi>e</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>*</mo>
<mfrac>
<mrow>
<mi>N</mi>
<mo>-</mo>
<mn>1</mn>
</mrow>
<mi>N</mi>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula (1-1), Noiseave(t) average value of the noise measurement obtained for t moment n times measurement, N ∈ (1,10),
Noiseave(t-1) it is N-1 average value for measuring obtained noise measurement of t-1 moment, Noisemeas(t) surveyed for t moment
The noise power measured.
6. the method as described in claim 1, which is characterized in that in the step (6), calculate under current time and working frequency
The power line channel attenuation of the downlink, including：Using the main website as transmitting terminal, the slave station is as receiving terminal, institute
It states transmitting terminal and swept-frequency signal is sent to receiving terminal；The power line channel of the downlink decays to the described of transmitting terminal transmission
Swept-frequency signal intensity subtracts receiving terminal received signal intensity.
7. the method as described in claim 1, which is characterized in that in the step (6), calculate under current time and working frequency
The power line channel attenuation of the uplink, including：Using the slave station as transmitting terminal, the main website is as receiving terminal, institute
It states transmitting terminal and swept-frequency signal is sent to receiving terminal；The power line channel of the uplink decays to the described of transmitting terminal transmission
Swept-frequency signal intensity subtracts receiving terminal received signal intensity.
8. the method as described in claim 1, which is characterized in that in the step (7), calculate current time and work frequency respectively
The link-quality of the uplink and the downlink indicates LQI under rate, including：
The power line channel attenuation of power line channel noise+uplink of the link-quality instruction LQI=main websites of uplink；
The power line channel attenuation of power line channel noise+downlink of the link-quality instruction LQI=slave stations of downlink.
9. the method as described in claim 1, which is characterized in that in the step (8), the link-quality indicates threshold value
For：The minimum of the link-quality of the uplink and downlink instruction LQI under the current time and working frequency
Value plus 5-15dB.
10. the method as described in claim 1, which is characterized in that in the step (8), to described with thin frequency granularity
Sub-band carries out spectrum aggregating, including：
Respectively to the thin frequency granularity sub-band of the low frequency, the thin frequency granularity sub-band of intermediate frequency and the thin frequency granularity of high frequency
Described in sub-band carries out spectrum aggregating in frequency band with thin frequency granularity sub-band；
To thin frequency can be used described in the thin frequency granularity sub-band of the low frequency and the thin frequency granularity sub-band of the intermediate frequency
Rate granularity sub-band carries out across band spectrum polymerization；
To thin frequency can be used described in the thin frequency granularity sub-band of the intermediate frequency and the thin frequency granularity sub-band of the high frequency
Rate granularity sub-band carries out across band spectrum polymerization.
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| CN107529688A (en) * | 2017-04-10 | 2018-01-02 | 华北电力大学（保定） | Middle voltage distribution networks power line carrier communication frequency method for optimizing based on channel input reactance |
| CN107888233A (en) * | 2017-11-13 | 2018-04-06 | 珠海格力电器股份有限公司 | Frequency modulation method and device |
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| CN103457636A (en) * | 2013-08-09 | 2013-12-18 | 国家电网公司 | Method and system for cross-frequency band power line carrier communication based on frequency recognition technology |
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| JP2014064100A (en) * | 2012-09-20 | 2014-04-10 | Aisin Seiki Co Ltd | Power line communication transceiver and power line communication method |
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| CN103457636A (en) * | 2013-08-09 | 2013-12-18 | 国家电网公司 | Method and system for cross-frequency band power line carrier communication based on frequency recognition technology |
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