CN104954311B - Power-line carrier communication system targeting signal generation method based on OFDM modulation - Google Patents
Power-line carrier communication system targeting signal generation method based on OFDM modulation Download PDFInfo
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- CN104954311B CN104954311B CN201510271999.8A CN201510271999A CN104954311B CN 104954311 B CN104954311 B CN 104954311B CN 201510271999 A CN201510271999 A CN 201510271999A CN 104954311 B CN104954311 B CN 104954311B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses the power-line carrier communication system targeting signal generation methods modulated based on OFDM, include the following steps：S1, sets the characterisitic parameter of OFDM symbol, and characterisitic parameter includes IFFT point number；S2 according to IFFT point number N, designs binary pseudo-random sequence PN one group longL, pseudo-random sequence PNLLength be NL；S3, to pseudo-random sequence PNLThe mapping of the first BPSK symbols is carried out, BPSK modulated signals is obtained, and BPSK modulated signals is filled on corresponding effective subcarrier；S4 does discrete fast Fourier inverse transformation to BPSK modulated signals, obtains OFDM baseband signals；S5, the short sequence PN of one group of binary system of designS, short sequence PNSCode length be NS；S6, to short sequence PNSBPSK modulation is done, obtains short sequence symbol；S7 carries out combined modulation to OFDM baseband signals using short sequence symbol, obtains NS sections of combined modulation signal；S8 determines targeting signal according to NS sections of combined modulation signal.The present invention adapts to complicated power line multi-path channel environment.
Description
【Technical field】
The power line carrier communication system modulated the present invention relates to digital information transmission technical field more particularly to based on OFDM
System targeting signal generation method.
【Background technology】
Power-line carrier communication abbreviation PLC refers to a kind of communication mode using power line transmission data.Power line
The working frequency of carrier communication is much larger than the power frequency component 50Hz or 60Hz of power grid, and such high-frequency signal can be with electric energy simultaneously
It is transmitted in power line, therefore, existing low voltage power distribution network infrastructure can be made full use of, be one without any wiring
Kind " No New Wires " technology, has saved resource, while also saves manpower, has saved cable investment, has accelerated network and open
The logical time.Particularly power-line carrier communication system can be applicable to automatic data logging (AMR), long-range throwing/incision pass, energy/load
The safety and reliability of power grid can be greatly improved in the fields such as management, equipment monitor and alarm for power-off, improve service quality and
Economic benefit.
However, power line channel transmission environment very severe, believes there are Various Complex noise jamming, with other business frequency ranges
Number couple, severe frequency selectivity and quick time variation, these all cause the great obstruction to signal transmitting,
Effective technology is needed to ensure the effective robust of signal transmission.
Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, be abbreviated as OFDM) skill
Art has data transmission capabilities, the efficient availability of frequency spectrum and the anti-multipath jamming of high speed, resists frequency selective fading channels
Ability, therefore be well suited for being applied to field of power line communication.At present, the narrow-band power line carrier communication standard formulated in the world,
Including ERDF G3 standards, PRIME standards and ITU G.9955, it is the narrow-band power line carrier communication skill of support OFDM modulation
Art standard.But external technical standard is not appropriate for China's national situation, and therefore, it is necessary to the power line environment exploitations specifically for China
Corresponding ofdm communication system.
Since narrow-band power line carrier communication system belongs to the communication system of burst, net synchronization capability is required very tight
Lattice, the error on any time or frequency, can all cause the performance of power-line carrier communication system very big loss.Therefore,
Design good targeting signal, fast and accurately obtained with receiving terminal convenient for transmitting terminal it is synchronous, to power-line carrier communication system
It is of great significance.
In the prior art, targeting signal usually is designed using the OFDM data of two or more repetitions, however, transmitting terminal
It is difficult to reach accurate synchronization with receiving terminal, and noise immunity is relatively low.
In addition, country variant and area are different to the communications band requirement of power line carrier communication, it is European
CENELEC regulation A channel band 10kHz to 95kHz, B channel band 95kHz to 120kHz, C channel bands 120kHz
To 140kHz, the Federal Communications Commission FCC regulations in the U.S. are using 10kHz to 490kHz, and China provides power line carrier communication
Frequency range is 3kHz~500kHz.Current targeting signal is difficult in adapt to requirement of multiple countries and regions to frequency range.
【The content of the invention】
Since the correlation of the OFDM data simply repeated is not strong, cause generated targeting signal synchronization accuracy not
Height, noise immunity be not also strong.In power-line carrier communication system, power line channel is the channel of very severe, and various interference are made an uproar
Sound is complicated, and impedance conversion is big, and attenuation is larger, there are serious interference, severe impedance mismatch and multipath fading are serious the problems such as.Cause
This, the targeting signal of the above method of prior art generation make when can not meet application transmitting terminal and receiving terminal accurate synchronization and
The strong requirement of noise immunity.
For overcome the deficiencies in the prior art, the present invention provides a kind of power line carrier communication systems based on OFDM modulation
System targeting signal generation method, improves synchronization accuracy and noise robustness.
Based on the power-line carrier communication system targeting signal generation method of OFDM modulation, include the following steps：
S1, sets the characterisitic parameter of OFDM symbol, and the characterisitic parameter includes IFFT point number；
S2 according to the IFFT point number N, designs binary pseudo-random sequence PN one group longL, the pseudo-random sequence PNL's
Length is NL；
S3, to the pseudo-random sequence PNLThe mapping of the first BPSK symbols is carried out, obtains BPSK modulated signals, and by described in
BPSK modulated signals are filled on corresponding effective subcarrier；
S4 does discrete fast Fourier inverse transformation to the BPSK modulated signals, obtains OFDM baseband signals；
S5, the short sequence PN of one group of binary system of designS, the short sequence PNSCode length be NS；
S6, to the short sequence PNSBPSK modulation is done, obtains short sequence symbol；
S7 carries out combined modulation to the OFDM baseband signals using the short sequence symbol, obtains NS sections of joint tune
Signal processed；
S8 determines targeting signal according to combined modulation signal NS sections described, and the targeting signal includes the joint and adjusts
Signal processed.
In one embodiment, following steps are further included in step S8：
Intercept prefix signal and suffix signal, be respectively placed in before the first segment of the combined modulation signal and last
After section；Wherein, the prefix signal is taken at the first segment of the combined modulation signal, and the suffix signal is taken at the joint
The final stage of modulated signal；
Using the entirety of the prefix signal, combined modulation signal and suffix signal as the targeting signal.
In one embodiment, the prefix signal is taken at the RI number backmost of the first segment of the combined modulation signal
According to the suffix signal is taken at the data of foremost RI of the final stage of combined modulation signal.
In one embodiment, the step S2 includes the following steps：
S21, the pseudo-random sequence PNLLength NL meet：
S22 chooses the pseudo-random sequence PNLM1Rank primitive polynomial G1(x), wherein m1Meet：
S23, according to the m of selection1Rank primitive polynomial G1(x), initial phase value, the pseudorandom that generation length is NL are set
Sequence PNL。
In one embodiment, the step S3 includes the following steps：
S31, by the pseudo-random sequence PNLIt is mapped to BPSK modulated signals XL：
XL(k)=[1-2 × PNL(k)]+j[1-2×PNL(k)]；
Wherein, XL(k) k-th of BPSK modulated signals X is representedL, PNL(k) pseudo-random sequence PN is representedLK-th value；
S32, by the BPSK modulated signals XL(k) it is filled into one by one on OFDM subcarriers；
Wherein, Xb(k) k-th of OFDM subcarrier is represented.
In one embodiment, by serial numberOn subcarrier be arranged to invalid subcarrier.
In one embodiment, the step S4 includes the following steps：
The result for doing inverse fast fourier transform to the BPSK modulated signals takes real part again, obtains OFDM baseband signals：
Wherein, xb(n) OFDM baseband signals are represented, IFFT [] represents inverse fast fourier transform handling function, real
[] represents to take complex signal real part handling function.
In one embodiment, the step S6 includes the following steps：
In the following way to the short sequence PNSDo BPSK modulation：
xs(i)=[1-2 × PNS(i)],0≤i≤NS；
Wherein, xs(i) i-th of symbol in short sequence symbol, PN are representedS(i) short sequence PN is representedSIn i-th value.
In one embodiment, the combined modulation signal S (n) NS sections described is：
Wherein, RN[] represents the rectangular window function based on length N：
In one embodiment, following steps are further included：
Windowing process is carried out to the targeting signal by raised cosine window, wherein, windowed function win (n) is：
Compared with the prior art, the invention has the advantages that：
One aspect of the present invention makes full use of the good autocorrelation performance of pseudo-random sequence so that the targeting signal of generation also has
There is good correlation, you can to simultaneously provide accurate and reliable timing position, to adapt to complicated power line multipath channel
Environment.
On the other hand, the flexibility of the effective sub-carrier configurations of OFDM is made full use of so that the band limits side of targeting signal
It can adjust, to meet the requirement for adapting to country variant and area to power line carrier frequency range.
Meanwhile the subcarrier-modulated of targeting signal makes full use of the stochastic behaviour of pseudo-random sequence so that before being generated
Leading signal has the characteristics that low peak average ratio.
In addition, by the windowing process to entire targeting signal, out-of-band radiation power is reduced further, ensures system
Good Electro Magnetic Compatibility.
【Description of the drawings】
Fig. 1 is a kind of targeting signal generation method flow chart that the specific embodiment of the invention provides；
Fig. 2 is a kind of specific embodiment of effective subcarrier and virtual subnet distribution of carriers in ofdm system；
Fig. 3 is long pseudo-random sequence PN in the specific embodiment of the inventionLGenerating structure figure；
Fig. 4 is targeting signal structure diagram generated in the specific embodiment of the invention；
Fig. 5 is the targeting signal waveform diagram generated in the specific embodiment of the invention；
Fig. 6 is the spectrum diagram of targeting signal generated in the specific embodiment of the invention；
Fig. 7 is phase of the targeting signal of receiving terminal reception in the specific embodiment of the invention under the state of signal-to-noise of -3dB
Close peak value schematic diagram.
【Specific embodiment】
The following further describes in detail the preferred embodiments of the invention.
As shown in Fig. 1 to 7, a kind of power-line carrier communication system targeting signal generation based on OFDM modulation of embodiment
Method, for generating the targeting signal of OFDM power-line carrier communication systems.
Step S1：The OFDM symbol characterisitic parameter of setting system, including working band, subcarrier spacing and IFFT point number
Deng.
First, the OFDM symbol characterisitic parameter of system is defined, shown in table specific as follows：
1 OFDM narrow-band power line carrier communication system parameters of table
| Index | Value |
| Working frequency (kHz) | 250 |
| IFFT point number N | 512 |
| Working band (kHz) | 41.992~88.867 |
| Subcarrier spacing Δ f | 488.28125Hz |
Wherein, working frequency is total frequency range that all effective subcarriers and invalid subcarrier occupy.
Then, based on working band and subcarrier spacing, effective total number of sub-carriers (N of real work is calculatedV=97) with
And corresponding effective subcarrier sequence number is from 86~182.Therefore, as shown in Fig. 2, in Fig. 2, W1 is indicated for the distribution of subcarrier
Subcarrier is imitated, W2 represents invalid subcarrier.
Step S2：According to IFFT point number, one group of long binary pseudo-random sequence is designed, is known as long sequence PNL, length is
NL。
First, it is 512 according to IFFT point number N, determines the area requirement of the length NL of binary pseudo-random sequence, i.e.,
Then, based on long sequence PNLLength requirement, i.e. NL >=255 choose the m of the long pseudo-random sequence1Rank basis is more
Item formula G1(x), wherein m1Meet：
That is m1=8
Then, according to 8 rank primitive polynomial G of selection1(x)=x8+x4+x3+x2+ 1, the rational initial phase of optimal design-aside
It is worth for 10101011b, the long sequence PN that generation length is NL=255L, generating structure is as shown in Figure 3；
Step S3：To long sequence PNLBPSK symbol mappings are carried out, its modulated signal is obtained and is filled into corresponding effective son
On carrier wave；
First, by the long sequence PNLIt is mapped to BPSK modulated signals XL, wherein mapping ruler is：
XL(k)=[1-2 × PNL(k)]+j[1-2×PNL(k)]；
Wherein, XL(k) k-th of BPSK modulated signal, PNL(k) pseudo-random sequence PN is representedLK-th value；
Secondly, by BPSK modulated signals XL(k) it is filled into that IFFT point number is 512, subcarrier spacing is Δ f and is had one by one
It imitates the OFDM that subcarrier number is 97 to modulate on carrier wave, i.e.,；
Preferably, it is in order to realize the transmission of base band real number signal on power line, the subcarrier on 256≤k≤511 is equal
It is arranged to invalid subcarrier.
Step S4：Discrete fast Fourier inverse transformation (IFFT) is done to the modulated signal after mapping, OFDM is obtained and believes substantially
Number.
The result that inverse fast fourier transform is done to modulated signal takes real part again, obtains OFDM baseband signals, i.e.,：
Wherein, xb(n) OFDM baseband signals are represented.IFFT [] represents inverse fast fourier transform handling function.real
[] represents to take complex signal real part handling function.
Step S5：The short binary pseudo-random sequence of another set or Barker code or their truncated code are introduced, is referred to as short
Sequence PNS, code length NS；
Due to short sequence PNSIt is to carry out whole modulation to entire OFDM baseband signals, therefore its Design of length is usual
Net synchronization capability and efficiency of transmission are taken into account, is commonly designed its code length as between 10~20.In the preferred embodiment, NS=is chosen
The Barker code with excellent correlated performance of 13bit is as short sequence, i.e.,
PNS=[1,1,1,1,1,0,0,1],.1,0,1,0,1
Step S6：To short sequence PNSBPSK modulation is done, obtains short sequence symbol；
Short sequence PNSIt is to realize the positive negatively-modulated to entire OFDM baseband signals, therefore, BPSK to do BPSK modulation
Modulating rule is：
xs(i)=[1-2 × PNS(i)],0≤i≤NS；
Wherein, XL(k) k-th of BPSK modulated signals X is representedL, PNL(k) pseudo-random sequence PN is representedLK-th value.
By above formula, realize that the short sequence of binary system to the symbol mapping of -1 value, obtains corresponding from " 0 " to+1 value and " 1 "
Short sequence symbol.
Step S7：Combined modulation is carried out to OFDM baseband signals using short sequence symbol, obtains NS sections of combined modulation signals；
Combined modulation is carried out to OFDM baseband signals using short sequence symbol, the joint that total length is NNS can be obtained
Modulated signal, i.e.,：
Wherein, RN[] represents the rectangular window function based on length N, i.e.,
So far, can targeting signal be determined according to combined modulation signal NS sections described, using combined modulation signal as before
Lead signal.But due to this combined modulation signal spectral band outside harass etc. poor-performings, it is also necessary to step S8 to S9 into
The processing of one step, can just further improve correlated performance.
Step S8：Prefix signal and suffix signal are intercepted, is respectively placed in the foremost and backmost of combined modulation signal；
The prefix signal is taken at the RI data backmost of the paragraph 1 (sequence number i is equal to 0) of combined modulation signal, and
Suffix signal is taken at foremost RI of NS-1 sections (that is, final stage, sequence number i are equal to [NS-1]) of combined modulation signal
Data.Preferably, it is 124 to set RI values.Its realization method is as shown in the targeting signal modulation schematic diagram of Fig. 4, TRIIt represents
The length of prefix signal and suffix signal.
Step S9：Windowing process is carried out to prefix signal and suffix signal, is obtained the prefix signal and suffix after adding window
Signal and the combined modulation signal targeting signal final as system.
It harasses outside the spectral band of system to further reduce, targeting signal is carried out at adding window by designing raised cosine window
Reason, obtained final targeting signal waveform are as shown in Figure 5.Specific windowed function is expressed as：
From the final targeting signal spectrum diagram of Fig. 6 can be seen that generated signal spectrum 41.992~
88.867kHz, and attenuation outside a channel can meet common EMC Requirements well up to more than 30dB.
And it is illustrated in figure 7 under the state of signal-to-noise of -3dB, the correlation peak signal for the targeting signal that receiving terminal receives
Figure.It can be seen from figure 7 that even if under the severe communication environment of -3dB, the correlation peak of receiving terminal targeting signal is still non-
Chang Mingxian shows that targeting signal noise immunity is very strong, and performance is fine.
Meanwhile from the method as can be seen that passing through simple modification frequency band, it can be ensured that system is operated in 40kHz
Arbitrary frequency range in the special frequency range of power line carrier of~500kHz, thus can support that China Power line carrier wave is special well
Frequency range and Europe CENELEC A/B/C/D frequency ranges and extended frequency band.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
On the premise of not departing from present inventive concept, several simple deduction or replace can also be made, should all be considered as belonging to the present invention by
The scope of patent protection that the claims submitted determine.
Claims (7)
1. based on the power-line carrier communication system targeting signal generation method of OFDM modulation, it is characterized in that, include the following steps：
S1, sets the characterisitic parameter of OFDM symbol, and the characterisitic parameter includes IFFT point number；
S2 according to the IFFT point number N, designs binary pseudo-random sequence PN one group longL, the pseudo-random sequence PNLLength
For NL；
S3, to the pseudo-random sequence PNLThe mapping of the first BPSK symbols is carried out, obtains BPSK modulated signals, and by the BPSK tune
Signal processed is filled on corresponding effective subcarrier；
S4 does discrete fast Fourier inverse transformation to the BPSK modulated signals, obtains OFDM baseband signals；
S5, the short sequence PN of one group of binary system of designS, the short sequence PNSCode length be NS；
S6, to the short sequence PNSBPSK modulation is done, obtains short sequence symbol；
S7 carries out combined modulation using the short sequence symbol to the OFDM baseband signals, obtains NS sections of combined modulation letter
Number；
S8 determines targeting signal according to combined modulation signal NS sections described, and the targeting signal is believed comprising the combined modulation
Number；
Step S2 is specifically included：According to the IFFT point number N, the area requirement for determining the length NL of the pseudo-random sequence isBased on pseudo-random sequence PNLLength NL requirement, choose pseudo-random sequence PNLM1Rank primitive polynomial G1
(x), wherein m1MeetAccording to the m of selection1Rank primitive polynomial G1(x), initial phase value is set, generates length
For the pseudo-random sequence PN of NLL；
Step S8 is specifically included：Prefix signal and suffix signal are intercepted, is respectively placed in the foremost and most of combined modulation signal
Below；Wherein, the prefix signal is taken at the RI data backmost of the paragraph 1 of combined modulation signal, and the suffix signal takes
In the data of foremost RI of the final stage of combined modulation signal；Adding window is carried out to the prefix signal and the suffix signal
Processing, and using the prefix signal after adding window and suffix signal and combined modulation signal as the targeting signal.
2. the power-line carrier communication system targeting signal generation method as described in claim 1 based on OFDM modulation, special
Sign is that the step S3 includes the following steps：
S31, by the pseudo-random sequence PNLIt is mapped to BPSK modulated signals XL：
XL(k)=[1-2 × PNL(k)]+j[1-2×PNL(k)]；
Wherein, XL(k) k-th of BPSK modulated signals X is representedL, PNL(k) pseudo-random sequence PN is representedLK-th value；
S32, by the BPSK modulated signals XL(k) it is filled into one by one on OFDM subcarriers；
Wherein, Xb(k) k-th of OFDM subcarrier is represented.
3. the power-line carrier communication system targeting signal generation method as claimed in claim 2 based on OFDM modulation, special
Sign is,
By serial numberOn subcarrier be arranged to invalid subcarrier.
4. the power-line carrier communication system targeting signal generation method as claimed in claim 3 based on OFDM modulation, special
Sign is that the step S4 includes the following steps：
The result for doing inverse fast fourier transform to the BPSK modulated signals takes real part again, obtains OFDM baseband signals：
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5. the power-line carrier communication system targeting signal generation method as claimed in claim 4 based on OFDM modulation, special
Sign is that the step S6 includes the following steps：
In the following way to the short sequence PNSDo BPSK modulation：
xs(i)=[1-2 × PNS(i)],0≤i≤NS；
Wherein, xs(i) i-th of symbol in short sequence symbol, PN are representedS(i) short sequence PN is representedSIn i-th value.
6. the power-line carrier communication system targeting signal generation method as claimed in claim 5 based on OFDM modulation, special
Sign is that the combined modulation signal S (n) NS sections described is：
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7. the power-line carrier communication system targeting signal generation method as described in claim 1 based on OFDM modulation, special
Sign is to further include following steps：
Windowing process is carried out to the targeting signal by raised cosine window, wherein, windowed function win (n) is：
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| CN107317604A (en) * | 2017-07-15 | 2017-11-03 | 青岛鼎信通讯股份有限公司 | Suitable for the interrupted envelope carrier modulating method of power line channel |
| CN108270714A (en) * | 2018-02-02 | 2018-07-10 | 北京晓程科技股份有限公司 | A kind of generation method and equipment of frame preamble signal |
| EP3742780A4 (en) * | 2018-03-16 | 2021-01-06 | Huawei Technologies Co., Ltd. | Communication method and communication device |
| CN114650205B (en) * | 2022-03-25 | 2023-07-28 | 深圳市力合微电子股份有限公司 | HPLC dual-mode high-speed wireless system preamble synchronization signal generation method |
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