CN111711470B - Broadband power line carrier communication implementation method and device - Google Patents
Broadband power line carrier communication implementation method and device Download PDFInfo
- Publication number
- CN111711470B CN111711470B CN202010535275.0A CN202010535275A CN111711470B CN 111711470 B CN111711470 B CN 111711470B CN 202010535275 A CN202010535275 A CN 202010535275A CN 111711470 B CN111711470 B CN 111711470B
- Authority
- CN
- China
- Prior art keywords
- signal
- noise
- power line
- signals
- communication
- 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
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- 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
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
Abstract
The invention discloses a broadband power line carrier communication implementation method, which comprises the following steps: coupling the power line access signal to obtain a communication signal; carrying out self-adaptive filtering on the communication signal to remove a high-frequency signal and a noise signal; carrying out anti-interference processing on the filtered signals, and further removing interference signals; carrying out windowing interpolation processing on the signal subjected to the interference rejection processing to obtain frequency domain information of the signal; and decoding the processed signals to obtain related data, packaging according to other communication protocols and transmitting to the outside. The invention also discloses a device based on the method, which comprises a signal coupling module, a signal anti-interference and filtering module, a signal modulation and decoding module and a data conversion and transmission module. The invention can effectively remove and inhibit the interference of noise on signals, improve the signal analysis level of power line communication, improve the overall quality of power line communication transmission and provide guarantee for the application of broadband power line communication technology.
Description
Technical Field
The invention belongs to the field of electric power automation, and particularly relates to a broadband power line carrier communication implementation method and device.
Background
The power line is the most popular physical medium with the widest coverage, adopts the power line as a communication medium, does not need communication line construction and communication line maintenance, and is an ideal information transmission carrier in the fields of intelligent power distribution networks and intelligent power utilization.
In the early days, narrow-band co-communication and narrow-band power line communication are mainly adopted, the frequency band is limited between 3kHz and 500kHz, the communication speed is less than 1Mbit/S, and signal modulation modes such as FSK, S-FS, OFDM and the like are generally adopted.
With the development and construction of smart grids, narrow-band power line communication cannot meet the requirements of current engineering applications, and therefore new broadband power line communication (HPLC) is developed. Broadband power line communication has the technical advantages of high speed and interconnection compared with narrowband carriers, and therefore, the broadband power line communication is widely applied to the fields of intelligent power grids, energy management and the like. The overall characteristics of the broadband power line communication technology are similar to those of a narrowband carrier, but the communication frequency range is 2-30MHz, the transmission rate can reach 25Mbit/s, the existing network in a power grid is used as a framework, a communication channel does not need to be additionally laid, the cost is saved, and stable and reliable data transmission can be realized.
However, when the power line is used for data transmission, it is found that electromagnetic interference in the line is serious, and a large number of high-frequency signals and noise signals are doped in the line, so that the influence and interference on power line communication signals are serious, and the use effect of power line communication is influenced. Therefore, there is an urgent need for a broadband power line carrier communication method and apparatus that can overcome the above-mentioned drawbacks.
Disclosure of Invention
Aiming at the problem that electromagnetic interference and noise signals influence the communication quality and information interaction of a line in broadband power line communication, the invention aims to provide a broadband power line carrier communication method, which can effectively remove and inhibit the interference of the noise to the signals, improve the overall quality of the power line communication and provide guarantee for the application of the broadband power line communication technology.
The invention also aims to provide a broadband power line carrier communication implementation device based on the implementation method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a broadband power line carrier communication implementation method comprises the following steps:
1) coupling the power line access signal to obtain a communication signal;
2) carrying out self-adaptive filtering on the communication signal to remove a high-frequency signal and a noise signal;
3) carrying out anti-interference processing on the filtered signals, and further removing interference signals;
4) carrying out windowing interpolation processing on the signal subjected to the interference rejection processing to obtain frequency domain information of the signal;
5) and decoding the processed signals to obtain related data, packaging according to other communication protocols and transmitting to the outside.
Further, the adaptive filtering: and according to the frequency band of the signals in the accessed region, a method of combining and setting a multi-stage filter is adopted to automatically switch the band elimination filter and the low-pass filter and remove the noise signals in the signals.
Further, the anti-interference processing: reducing noise interference according to a method of combining time domain and frequency, and in the time domain part, carrying out noise suppression by adjusting the duty ratio of a pulse signal; in the frequency domain part, a band elimination filter is arranged according to the power spectral density of noise at different frequency points, so that the suppression of the noise is realized.
Further, the windowing interpolation processing: windowing is carried out on the signals by adopting a third-order Chebyshev window function, then the windowed data are processed by adopting a fast Fourier algorithm, and further detailed frequency domain information of the signals is obtained.
A broadband power line carrier communication implementation apparatus, the apparatus comprising:
the signal coupling module is used for obtaining a communication signal from the power line;
the signal anti-interference and filtering module adopts a method of combining and setting a multi-stage filter to autonomously switch a band elimination filter and a low-pass filter and remove a noise signal in a signal; further suppressing and removing noise according to a method of combining time domain and frequency, and further effectively suppressing noise;
the signal modulation and decoding module is used for windowing to acquire specific frequency domain information of the signal;
and the data conversion and transmission module is used for packaging information according to protocols of various communication interfaces to realize external transmission of signals.
Further, the signal anti-interference and filtering module further suppresses and removes noise according to a method of combining a time domain and a frequency: in the time domain part, noise suppression is carried out by adjusting the duty ratio of the pulse signal; in the frequency domain part, a band elimination filter is arranged according to the power spectral density of noise at different frequency points for filtering, so that the suppression of the noise is realized. In the prior art, when a power line is used for data transmission, the electromagnetic interference in the line is found to be serious, and a large number of high-frequency signals and noise signals are doped in the line, so that the influence and the interference on power line communication signals are serious, and the use effect of power line communication is influenced. Aiming at the problem, the invention provides a method and a device suitable for realizing broadband power line carrier communication, which can effectively remove and inhibit the interference of noise on signals, improve the signal analysis level of power line communication, improve the overall quality of power line communication transmission and provide guarantee for the application of broadband power line communication technology.
Drawings
Fig. 1 is a flowchart of a broadband power line carrier communication implementation method according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, the method for implementing broadband power line carrier communication of the present embodiment includes the following steps:
1) a communication signal is acquired. And accessing the power transmission line, and acquiring a communication signal in the power grid through the signal coupling module. The frequency range of power line carrier use in China is 40-500kHz, so a filter is needed to be involved to filter 220V power frequency alternating current, and a high-frequency carrier signal superposed on the power frequency alternating current is extracted, therefore, in order to ensure complete acquisition of the signal, RC series current is usually adopted to form a passive high-pass filter to filter the 220V power frequency alternating current, and the carrier signal is acquired.
2) And (4) self-adaptive filtering processing. And according to the frequency band of the signals in the accessed region, a method of combining and setting a multi-stage filter is adopted to automatically switch the band elimination filter and the low-pass filter and remove the noise signals in the signals. From the research of the power line channel in China, the noise is distributed differently in different scenes and different time, but most scene noise is concentrated below 1MHz, even below 500kHz, and few noises can reach the frequency point of 2.5 MHz. Therefore, according to the frequency characteristics of most of current carrier communication, predefined different frequency bands are selected from 2-12Mhz channels for self-adaptation, the specific setting mode is flexibly adjusted according to the characteristics of the region, and a low-pass filter is selected under the condition of serious noise interference to remove high-frequency signals; and the band elimination filter is automatically switched under the condition of less interference so as to reduce signal attenuation. The selection of a specific frequency band can be realized by setting a frequency band interval N, namely, when the signal frequency f is less than 10MHz, the signal frequency f is divided into 1-N, N-2N and 2N-3N; when the signal f exceeds 10MHz, it is uniformly set to 10MHz or more. For example, if N is set to 2, the frequency band is automatically divided into a plurality of levels of frequency bands below 1-2MHz, 2-4Mhz, 4-6MHz, 6-8Mhz, 8-10MHz and above 10 MHz. In the same way, if N is set to be 3, the frequency bands are divided according to 1-3MHz, 3-6MHz, 6-9Hz, 9M-10MHz and more than 10 MHz. After the self-adaptive division of different frequency bands is completed, preliminary spectrum analysis is carried out on external information, and the frequency band of the noise signal with the maximum amplitude is selected as a main filtering frequency band. When the largest noise frequency band is distributed in the above frequency band, such as the distribution is just between 6-8MHz, then the band-stop filter of the frequency channel range is selected for noise filtering. If the signal is greater than 10MHz or less than N, then the low pass filter is automatically switched to filter.
3) And carrying out anti-interference processing on the filtered signals. This step is a further improvement of the adaptive filtering of the front. After adaptive filtering, the signal is further processed. The interference of noise is reduced according to a method combining time domain and frequency. In the time domain, the noise is suppressed by adjusting the duty ratio of the pulse signal.
In the frequency domain part, corresponding filtering methods are arranged according to the power spectral density distribution of noise at different frequency points, so that the noise suppression is realized. In specific implementation, according to the power spectral density distribution curve, frequency point ranges corresponding to 90% of peak points on two sides of the peak point are selected, and a band elimination filter is arranged to further filter noise signals. For example, when the frequency corresponding to the peak a of the power spectral density distribution curve is fa, and the power spectral density distribution curve is parabolic, there are two frequency points corresponding to the amplitude of 90% a around the peak a, which are f1 and f2, respectively, where f1< fa < f2, and then the signals in the frequency range of f1-f2 are filtered by a band-stop filter, so as to further reduce the noise signals. 4) Spectral analysis of the signal. Windowing is carried out on the signals by adopting a third-order Chebyshev window function, then the windowed data are processed by adopting a fast Fourier algorithm, and further detailed frequency domain information of the signals is obtained.
5) Signal modulation and transmission. And decoding the processed signal to obtain the message for information transmission. And then packaging according to protocols of various communication interfaces to realize external transmission of signals. Such as an RS485 serial port, an RJ-45 Ethernet port and the like, and realizes interaction according to a communication mode commonly used in the industrial field after receiving power line transmission information.
Certainly, the above method is to acquire signals from the power line, acquire message information through filtering, anti-interference processing and windowing interpolation calculation and analysis, and then package the message information according to a common communication interface and a communication protocol for external transmission. Similarly, messages transmitted through the RJ-45 ethernet port from the outside are also transmitted through the power line after being modulated, filtered and subjected to anti-interference processing.
The device using the broadband power line carrier communication implementation method of the embodiment comprises a signal coupling module, a signal anti-interference and filtering module, a signal modulation and decoding module and a data conversion and transmission module.
The following processing flows are adopted among the modules:
1) the signal coupling module acquires a signal from the power line;
2) the signal anti-interference and filtering module adopts a method of combining and setting multi-stage filters to automatically switch a band elimination filter and a low-pass filter to remove a noise signal in a signal, then further suppress and remove the noise according to a method of combining a time domain and a frequency, in a time domain part, the noise is suppressed by adjusting the duty ratio of a pulse signal, in a frequency domain part, corresponding filtering methods are distributed according to the power spectral density of the noise at different frequency points, and then the noise is effectively suppressed.
3) The signal modulation and decoding module is used for windowing to obtain specific frequency domain information of the signal;
4) and the data conversion and transmission module encapsulates the specific information according to protocols of various communication interfaces to realize external transmission of signals.
The above description is only a preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (5)
1. A broadband power line carrier communication implementation method is characterized by comprising the following steps:
1) coupling the power line access signal to obtain a communication signal;
2) carrying out self-adaptive filtering on the communication signal to remove a high-frequency signal and a noise signal;
3) carrying out anti-interference processing on the filtered signals, and further removing interference signals;
the anti-interference processing comprises the following steps: reducing noise interference according to a method of combining time domain and frequency, and in the time domain part, carrying out noise suppression by adjusting the duty ratio of a pulse signal; in the frequency domain part, a band elimination filter is arranged according to the power spectral density of noise at different frequency points, so that the suppression of the noise is realized;
4) carrying out windowing interpolation processing on the signal subjected to the interference rejection processing to obtain frequency domain information of the signal;
5) and decoding the processed signals to obtain related data, packaging according to other communication protocols and transmitting to the outside.
2. The method of claim 1, wherein the adaptive filtering is performed by: and according to the frequency band of the signals in the accessed region, a method of combining and setting a multi-stage filter is adopted to automatically switch the band elimination filter and the low-pass filter and remove the noise signals in the signals.
3. The broadband power line carrier communication implementation method of claim 1 or 2, wherein the windowing interpolation process: windowing is carried out on the signals by adopting a third-order Chebyshev window function, then the windowed data are processed by adopting a fast Fourier algorithm, and further detailed frequency domain information of the signals is obtained.
4. An apparatus for implementing broadband power line carrier communication, the apparatus comprising:
the signal coupling module is used for obtaining a communication signal from the power line;
the signal anti-interference and filtering module adopts a method of combining and setting a multi-stage filter to autonomously switch a band elimination filter and a low-pass filter and remove a noise signal in a signal; further suppressing and removing noise according to a method of combining time domain and frequency, and further effectively suppressing noise;
the signal modulation and decoding module is used for windowing to acquire specific frequency domain information of the signal;
and the data conversion and transmission module is used for packaging information according to protocols of various communication interfaces to realize external transmission of signals.
5. The apparatus of claim 4, wherein the signal interference rejection and filtering module further suppresses and removes noise according to a time domain and frequency combination method: in the time domain part, noise suppression is carried out by adjusting the duty ratio of the pulse signal; in the frequency domain part, a band elimination filter is arranged according to the power spectral density of noise at different frequency points for filtering, so that the suppression of the noise is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535275.0A CN111711470B (en) | 2020-06-12 | 2020-06-12 | Broadband power line carrier communication implementation method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535275.0A CN111711470B (en) | 2020-06-12 | 2020-06-12 | Broadband power line carrier communication implementation method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111711470A CN111711470A (en) | 2020-09-25 |
| CN111711470B true CN111711470B (en) | 2021-06-29 |
Family
ID=72540016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010535275.0A Active CN111711470B (en) | 2020-06-12 | 2020-06-12 | Broadband power line carrier communication implementation method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111711470B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113472392B (en) * | 2021-06-23 | 2022-11-11 | 北京溢美四方软件技术有限公司 | Frequency band detection method for broadband power line carrier communication |
| CN113783587B (en) * | 2021-11-12 | 2022-02-22 | 国网江苏省电力有限公司营销服务中心 | Noise self-adaption method and device in electricity consumption information data acquisition process |
| CN114531176A (en) * | 2022-01-14 | 2022-05-24 | 山东梅格彤天电气有限公司 | Carrier communication quality optimization method, device and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205157788U (en) * | 2015-11-20 | 2016-04-13 | 武汉梦芯科技有限公司 | Single -frequency GNSS signal narrowband interference suppression device and multifrequency GNSS signal narrowband interference restrain system |
| CN112014806A (en) * | 2020-08-14 | 2020-12-01 | 西安电子科技大学 | Method for suppressing unintentional interference of airborne radar in complex interference scene |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9154002B2 (en) * | 2010-01-25 | 2015-10-06 | Access Business Group International Llc | Systems and methods for detecting data communication over a wireless power link |
| US9407323B2 (en) * | 2013-01-18 | 2016-08-02 | Marvell World Trade Ltd. | Devices and methods for power consumption control in powerline communications systems and apparatus |
| CN103297091B (en) * | 2013-05-10 | 2015-03-04 | 中国科学院微电子研究所 | Power line communication transmission system and power line communication receiving system |
| CN103532901B (en) * | 2013-10-14 | 2017-06-23 | 国家电网公司 | A kind of time synchronization method and system for power line carrier communication |
| CN105791194B (en) * | 2014-12-24 | 2019-10-22 | 国家电网公司 | It is a kind of can the interference of anti-narrowband synchronous method and its system |
| CN107769815A (en) * | 2016-08-19 | 2018-03-06 | 南京理工大学 | Linear frequency modulation short-range detecting system noise AM interference suppressing method |
-
2020
- 2020-06-12 CN CN202010535275.0A patent/CN111711470B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205157788U (en) * | 2015-11-20 | 2016-04-13 | 武汉梦芯科技有限公司 | Single -frequency GNSS signal narrowband interference suppression device and multifrequency GNSS signal narrowband interference restrain system |
| CN112014806A (en) * | 2020-08-14 | 2020-12-01 | 西安电子科技大学 | Method for suppressing unintentional interference of airborne radar in complex interference scene |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111711470A (en) | 2020-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111711470B (en) | Broadband power line carrier communication implementation method and device | |
| Yonge et al. | An overview of the HomePlug AV2 technology | |
| US10050672B2 (en) | Method for processing an analog signal coming from a transmission channel, in particular a signal carried by power line communications | |
| CN108880621B (en) | Adaptive filtering method for power line communication signals | |
| JP2003008521A (en) | Method and device for canceling noise | |
| CN109257068B (en) | Adaptive filtering method for power line communication signals | |
| CN107359905B (en) | Digital front end and frame detection method for frequency division power line carrier communication | |
| CN103259754A (en) | Digital front end system used for power line carrier communication and implementation method of digital front end system | |
| EP1798865B1 (en) | Communication apparatus and communication method used in spectrum sharing environment | |
| Jiang et al. | Low-complexity spectral precoding for rectangularly pulsed OFDM | |
| CN108494511B (en) | Dynamic arrival spectrum sensing method based on absolute value accumulation | |
| CN101651463A (en) | Method and device for suppressing narrowband interference of baseband signals | |
| CN103973608A (en) | Channel estimating method for single carrier frequency domain equalization in short-wave communication channel | |
| CN107317784A (en) | A kind of many band parallel filtering mixed carrier transmission methods | |
| CN108123724B (en) | Communication system based on short wave narrow-band waveform | |
| CN109039379B (en) | Power line communication signal filtering method | |
| RU2545505C2 (en) | Signal processing method and device for long term evolution (lte) base station side | |
| CN107911326B (en) | Noise suppression transmission method of medium-voltage power line OFDM communication system | |
| CN111934716B (en) | Power line communication signal filtering method and system | |
| CN105656516A (en) | Method for regulating middle-voltage power carrier power | |
| CN202261303U (en) | Anti-jamming device based on cognitive radio | |
| CN109309513B (en) | Adaptive reconstruction method for power line communication signals | |
| CN109245839B (en) | Method for detecting narrow-band interference, communication chip and communication device thereof | |
| CN103338058B (en) | Multi-frequency programmable matching filter | |
| CN109194345B (en) | GMSK waveform adjacent channel interference resisting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |