CN104917713B - Narrowband power line communication power frequency zero transmission method based on OFDM modulation - Google Patents
Narrowband power line communication power frequency zero transmission method based on OFDM modulation Download PDFInfo
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- CN104917713B CN104917713B CN201510227494.1A CN201510227494A CN104917713B CN 104917713 B CN104917713 B CN 104917713B CN 201510227494 A CN201510227494 A CN 201510227494A CN 104917713 B CN104917713 B CN 104917713B
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- frame message
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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
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a kind of narrowband power line communication power frequency zero transmission methods based on OFDM modulation comprising following steps：Confirm that physical layer needs the original message for handling and sending；Form frame message；Judge whether to send frame message according to power frequency zero transmission mode；Configure frame message format；Periodically send the frame message configured；Frame message is sent according to the continuous transmission mode in former G3 PLC standards；Periodically send the frame message configured；Judge whether according to power frequency zero transmission mode receiving frame message；According in G3 PLC standards OFDM demodulation and fec decoder mode demodulate reception data；According in G3 PLC standards OFDM demodulation and fec decoder mode demodulate reception data；It obtains receiving terminal and demodulates message, complete physical layer and receive and handle.The present invention ensure that higher traffic rate while compatible international standard.
Description
Technical field
The present invention relates to a kind of transmission methods, more particularly to a kind of narrowband power line communication power frequency based on OFDM modulation
Zero transmission method.
Background technology
Power-line carrier communication is a kind of communication mode carried out data transmission as medium using power line, is had
Natural advantage.With the gradually foundation of national smart grid, voltage power-line carrier communication technology is in electric energy and the various energy
Metering field has obtained deep application, and power line carrier communication is in the application range in the fields such as household electrical appliance automation control
Will be very extensive with foreground, therefore, power line carrier communication has huge economic benefit and significant social benefit.
Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, be abbreviated as OFDM) is
A kind of special multi-carrier signal modulator approach improves communication speed compared with the single-carrier modulateds mode such as original FSK, PSK
Rate, and frequency selective fading can be effectively antagonized, there is higher noise robustness, be more suitable for power line channel ring
Border.Formulated series of standards for low pressure narrowband power line communication in the world at present, as ITU-T G.990x series standard,
1901.2 standards of IEEE Std, G3-PLC standards, PRIME standards etc. have been all made of OFDM modulation techniques, and ITU-T
G.9903 G3-PLC standard formulations are based on 1901.2 standards of IEEE Std, are the affirmative to the standard technique.But, by
It is extensive in China Power Grids distribution, population in use is numerous, and that there are circuits in many areas is irregular, and power utilization environment noise is big,
The problems such as supply district is big, spread of voltage, and unqualified earth leakage protective device is easy tripping, these and foreign countries, especially America and Europe are electric
The power grid environment in the very fast area of line of force Communication Development is entirely different, it is therefore desirable to according to China Power Grids environment to G3-PLC standards into
Row improves, to play better communication performance.
Since in industrial frequency AC near zero-crossing point, various interference are relatively small with noise, and channel circumstance is cleaner, more suitable
Data transmission is closed, and international relevant criterion does not consider power frequency zero transmission mode at present, therefore, the present invention is in G3-PLC standards
On the basis of increase power frequency zero transmission technology, only transmit signal in power frequency near zero-crossing point, other periods do not transmit.Power frequency zero
Point transmission requires relatively low, the cost of device capable of reducing power source to the power output of sending node, meanwhile, what intermittence was sent
Carrier signal can effectively avoid earth leakage circuit-breaker mistrip.Also, it is original continuous in the compatible G3-PLC standards of the present invention
Transmission mode.
The Chinese invention patent of number of patent application 201410011148.5 discloses one kind and being adapted to power line communication zero passage
The OFDM frames design of point transmission, the design are also that ac zero-crossing point region carries out data on power line by the way of OFDM
Burst communication, but the invention can not be compatible with international relevant communication standard, and its FFT points are 1024 points, sample frequency is
2MHz, realization is increasingly complex compared with G3-PLC standards, and can not ensure its hardware circuit communication performance.
Meanwhile the Chinese invention patent of number of patent application 20120378047.2 discloses one kind and being suitable for low-voltage power line
The high speed carrier communication technology, be based on electric main power frequency simultaneous techniques, but its system be based on FSK spread spectrum carrier communication technologies,
Compared with OFDM modulation techniques, rate is relatively low, cannot be satisfied intelligent grid and household intelligent control big data quantity, high-speed is wanted
It asks.
Invention content
Technical problem to be solved by the invention is to provide a kind of narrowband power line communication power frequencies zero based on OFDM modulation
Point transmission method makes communication system be more suitable for China Power Grids environment, improves system while compatible international standard
Noise robustness, while ensure that higher traffic rate.
The present invention is to solve above-mentioned technical problem by following technical proposals：A kind of narrowband electricity based on OFDM modulation
The line of force communicates power frequency zero transmission method, which is characterized in that it includes the following steps：
Step 1：Confirm that physical layer needs the original message for handling and sending；
Step 2：FEC codings are carried out to original message according to G3-PLC standards and OFDM is modulated, form frame message；
Step 3：According to system requirements, judge whether to send frame message according to power frequency zero transmission mode；
Step 4：If necessary to send frame message according to power frequency zero transmission mode, then frame message format is configured first；
Step 5：According to power frequency zero transmission mode, the frame message configured is periodically sent；
Step 6：If you do not need to sending frame message according to power frequency zero transmission mode, i.e., according in former G3-PLC standards
Continuous transmission mode send frame message, configure frame message format；
Step 7：According to continuous transmission mode, the frame message configured is periodically sent；
Step 8：Receiving terminal adaptive reception frame message, by judging the relationship of leading character end position and power frequency zero,
Judge whether according to power frequency zero transmission mode receiving frame message；
Step 9：According to power frequency zero transmission mode, according to frame message format configuring condition, according in G3-PLC standards
OFDM demodulation and fec decoder mode demodulate reception data；
Step 10：According to continuous transmission mode, according to frame message format configuring condition, according to the OFDM in G3-PLC standards
Demodulation and fec decoder mode demodulate reception data；
Step 11：It obtains receiving terminal and demodulates message, complete physical layer and receive and handle.
Preferably, the frame message format of the step 4 and the frame message format of step 6 all include leading character, synchronous head
And the configuration of data.
Preferably, the transmitting terminal of the step 5 controls certain phase power frequency dead-center position in three-phase when sending signal, just
It is located at the centre position of leading character well.
Preferably, the transmitting terminal of the step 7 controls leading character end position when sending signal, is located exactly at this phase
The power frequency dead-center position of position.
Preferably, if step 8 satisfaction ± △=3.33 × N+1.44 ± 0.2 (ms), then it is assumed that be that power frequency zero passes
Defeated pattern；If meeting △=3.33 × N ± 0.2 (ms), then it is assumed that be continuous transmission mode.
The positive effect of the present invention is that：The present invention keeps communication system more applicable while compatible international standard
In China Power Grids environment, the noise robustness of system is improved, while ensure that higher traffic rate, in addition can be compatible with blueness
The high velocity, low pressure narrow-band power line carrier communication system that island Neusoft carrier wave Science and Technology Co., Ltd. former base is modulated in OFDM.
Description of the drawings
In order to illustrate more clearly of technical scheme of the present invention, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, drawings in the following description are only some embodiments of the invention, for the common skill in this field
For art personnel, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is the power frequency zero transmission mode schematic diagram of the present invention.
Fig. 2 is the flow diagram of the narrowband power line communication method based on OFDM modulation of the present invention.
Fig. 3 is data frame structure schematic diagram.
Fig. 4 be the present invention power frequency zero transmission mode in synchronous head and data configuration schematic diagram.
Fig. 5 is that the power frequency zero transmission mode timing of the present invention sends leading character position view.
Fig. 6 is that the continuous transmission mode timing of the present invention sends leading character position view.
Specific implementation mode
The preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
As shown in Figure 1, since China Power Grids power frequency is 50Hz, the corresponding period is 20ms, under power frequency zero transmission mode,
The present invention is divided into multiple periods synchronous with power frequency, each period as unit of power frequency half period 10ms, by power line channel
Centered on power frequency zero crossing, signal is transmitted within the period (about 3.33ms) no more than power frequency half period one third.
The duration of the leading character of physical layer frame, synchronous head and data was limited in the above-mentioned period, but can be split as multiple
Period is transmitted.Power frequency zero transmission mode needs chip exterior zero crossing circuitry to add chip interior zero passage timer jointly complete
At zero passage timer resets Counter Value and count again, in order to calculate power frequency zero after detecting zero signal every time
Point position relationship.
As shown in Fig. 2, the present embodiment provides a kind of narrowband power line communication power frequency zero transmission sides based on OFDM modulation
Method includes the following steps：
Step 1：Confirm that physical layer needs the original message for handling and sending.
Step 2：FEC codings are carried out to original message according to G3-PLC standards and OFDM is modulated, form frame message.
Frame message refers to two kinds of frame types of G3-PLC standard physical layers support：Data frame and acknowledgement frame.Data frame is physics
The basic unit of layer data transmission, it is made of leading character (Preamble), synchronous head (FCH) and data (Payload), is such as schemed
Shown in 3.Acknowledgement frame includes only then targeting signal and frame synchronization head.
Under normal circumstances, the leading character of data frame is made of 9.5 OFDM symbols, specially 8 identical SYNCP
Symbol and 1.5 identical SYNCM symbols compositions, wherein each symbol duration is 640us, when leading character continues total
Between be 6.08ms；Synchronous head is made of 13 OFDM symbols；Data symbol length is variable according to actual conditions length, wherein synchronous
Head and each symbol duration of data are 695us.
Leading character is mainly used for AGC and adapts to adjustment, sign synchronization, channel estimation and initial phase with reference to estimation etc., each
SYNCP symbols and SYNCM symbols are 256 sampled points, and SYNCM symbols are identical with SYNCP symbols, only all sub- loads
Wave all carries out π phase shifts, i.e. SYNCP only indicates that symbol is multiplied by+1, SYNCM and indicates that symbol is multiplied by -1.
Step 3：According to system requirements, judge whether to send frame message according to power frequency zero transmission mode.
Step 4：If necessary to send frame message according to power frequency zero transmission mode, then frame message format, frame are configured first
Message format includes the configuration of leading character, synchronous head and data.
Wherein leading character can be configured to 4.5 × M OFDM symbol, each power frequency zero slot transmission leading character it is lasting when
Between be：4.5 × 640us=2.88ms, M indicate power frequency zero number needed for leading character transmission, can both take 1, can also take it
His integer, it is therefore an objective to improve synchronization dependability and for AGC lockings, SNR estimations etc., if M ＞ 1, before M-1 power frequency zero when
Gap sends 4.5 or 4 SYNCP symbols, the last one power frequency zero time slot sends 3 SYNCP symbols and 1.5 SYNCM symbols
Number, amount to 4.5 symbols.
Wherein the configuration of synchronous head and data is as shown in figure 4, each 1 SYNCP symbol of power frequency zero slot transmission and 3
Synchronous head or data symbol, duration are 1 × 640us+3 × 695us=2.725ms, and power frequency zero is located exactly at this 4 symbols
Number centre position.Under the transmission mode, synchronous head and synchronizing for data consist of two parts：
(1) when after leading character by 10ms fixed response times；
(2) SYNCP of each power frequency zero provides fixed phase for synchronizing, while to synchronous head or data symbol, uses
In differential ference spiral.
Step 5：According to power frequency zero transmission mode, the frame message configured is periodically sent, as shown in figure 5, transmitting terminal exists
Certain phase power frequency dead-center position in control three-phase, is located exactly at the centre position of leading character when sending signal.It is not necessarily to this phase at this time
Zero is transmitted, and selection is can also be configured, to take into account the low signal-to-noise ratio situation of receiving terminal.
Step 6：If you do not need to sending frame message according to power frequency zero transmission mode, i.e., according in former G3-PLC standards
Continuous transmission mode sends frame message, configures frame message format, includes the configuration of leading character, synchronous head and data.
Wherein leading character number can be configured to 4.5~12.5 OFDM symbols, that is, support 3~11 SYNCP symbols and 1.5
A SYNCM symbols, the parameter being defaulted as in G3-PLC standards.Preferable in channel circumstance, noise is relatively high or communication system is stablized
In the case of, receiving terminal can be completed synchronous and AGC using 4.5 leading character symbols and adjust, and save signal duration.
Synchronous head and data under continuous transmission mode are still configured according to G3-PLC mode standards, no particular/special requirement.
Step 7：According to continuous transmission mode, the frame message configured is periodically sent, as shown in fig. 6, transmitting terminal is being sent
Leading character end position is controlled when signal, is located exactly at the power frequency dead-center position of this phase, and generally send as early as possible, is to improve
System efficiency of transmission.
Step 8：Receiving terminal adaptive reception frame message, by judging the relationship of leading character end position and power frequency zero,
Judge whether according to power frequency zero transmission mode receiving frame message.
If satisfaction ± △=3.33 × N+1.44 ± 0.2 (ms), then it is assumed that be power frequency zero transmission mode；If meet △=
3.33 × N ± 0.2 (ms), then it is assumed that be continuous transmission mode.Wherein △ is zero counters count after leading character receives
Time；3.33ms is three-phase zero interval, and 0.2ms is zero passage detection and synchronized sampling error, and 1.44ms transmits for this phase zero
When, leading character end point and power frequency zero distance, N generally take 0, can also be equal to 1 or 2.
Step 9：According to power frequency zero transmission mode, according to frame message format configuring condition, according in G3-PLC standards
OFDM demodulation and fec decoder mode demodulate reception data.
Step 10：According to continuous transmission mode, according to frame message format configuring condition, according to the OFDM in G3-PLC standards
Demodulation and fec decoder mode demodulate reception data.
Step 11：It obtains receiving terminal and demodulates message, complete physical layer and receive and handle.
The present invention is existing better than other by theory analysis, algorithm simulating, FPGA tests and chip testing, system communication performance
Some technologies, and traffic rate is higher than other existing single carrier communication technologies, can meet intelligent grid and home intelligent completely
The demand of control.
Particular embodiments described above, the technical issues of to the solution of the present invention, technical solution and advantageous effect carry out
It is further described, it should be understood that the above is only a specific embodiment of the present invention, is not limited to
The present invention, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection domain of invention.
Claims (5)
1. a kind of narrowband power line communication power frequency zero transmission method based on OFDM modulation, which is characterized in that it includes following
Step：
Step 1：Confirm that physical layer needs the original message for handling and sending；
Step 2：FEC codings are carried out to original message according to G3-PLC standards and OFDM is modulated, form frame message；
Step 3：According to system requirements, judge whether to send frame message according to power frequency zero transmission mode, if so, executing step
Four；If it is not, executing step 6；
Step 4：If necessary to send frame message according to power frequency zero transmission mode, then frame message format is configured first, wherein
The message format of the power frequency zero transmission mode is：The duration of the leading character of physical layer frame, synchronous head and data limits
In 3.33ms processed, but removable it be divided into multiple periods and be transmitted；
Step 5：According to power frequency zero transmission mode, the frame message configured is periodically sent；
Step 6：If you do not need to sending frame message according to power frequency zero transmission mode, i.e., according to the company in former G3-PLC standards
Continuous transmission mode sends frame message, configures frame message format, wherein the message of the continuous transmission mode in the G3-PLC standards
Format includes leading character, synchronous head and data, and the leading character of the data frame is made of 9.5 OFDM symbols, and specially 8 complete
Exactly the same SYNCP symbols and 1.5 identical SYNCM symbols compositions, wherein each symbol duration is 640us,
Leading character continues total time as 6.08ms；Synchronous head is made of 13 OFDM symbols；Data symbol length is long according to actual conditions
Degree is variable, and wherein each symbol duration of synchronous head and data is 695us；
Step 7：According to continuous transmission mode, the frame message configured is periodically sent；
Step 8：Receiving terminal adaptive reception frame message is judged by judging the relationship of leading character end position and power frequency zero
Whether according to power frequency zero transmission mode receiving frame message；
Step 9：If according to power frequency zero transmission mode, according to frame message format configuring condition, according in G3-PLC standards
OFDM demodulation and fec decoder mode demodulate reception data；
Step 10：If according to continuous transmission mode, according to frame message format configuring condition, solved according to the OFDM in G3-PLC standards
It adjusts and fec decoder mode demodulates reception data；
Step 11：It obtains receiving terminal and demodulates message, complete physical layer and receive and handle.
2. the narrowband power line communication power frequency zero transmission method as described in claim 1 based on OFDM modulation, feature exist
All include the configuration of leading character, synchronous head and data in, the frame message format of the step 4 and the frame message format of step 6.
3. the narrowband power line communication power frequency zero transmission method as described in claim 1 based on OFDM modulation, feature exist
In the transmitting terminal of the step 5 controls certain phase power frequency dead-center position in three-phase when sending signal, is located exactly at leading character
Centre position.
4. the narrowband power line communication power frequency zero transmission method as described in claim 1 based on OFDM modulation, feature exist
In the transmitting terminal of the step 7 controls leading character end position when sending signal, is located exactly at the power frequency zero of this phase
Position.
5. the narrowband power line communication power frequency zero transmission method as described in claim 1 based on OFDM modulation, feature exist
In if step 8 satisfaction ± △=3.33 × N+1.44 ± 0.2 (ms), then it is assumed that be power frequency zero transmission mode；If full
Sufficient △=3.33 × N ± 0.2 (ms), then it is assumed that be continuous transmission mode；Wherein, △：After leading character receives, zero counts
Device timing statistics, ms；N generally takes the arbitrary value in 0,1,2.
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| CN106936753B (en) * | 2015-12-31 | 2019-12-13 | 钜泉光电科技(上海)股份有限公司 | transmission method based on OFDM power line communication |
| CN105681243B (en) * | 2016-03-14 | 2018-11-27 | 中国科学院微电子研究所 | Frame Timing Synchronization Method Applied to Broadband OFDM Power Line Communication System |
| CN107770110A (en) * | 2016-08-19 | 2018-03-06 | 弥亚微电子（上海）有限公司 | A kind of sending method of discontinuous frame, channel compensating method |
| CN108173799B (en) * | 2017-11-29 | 2020-08-07 | 深圳市力合微电子股份有限公司 | Power line carrier communication method based on frequency domain processing |
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| CN101751766A (en) * | 2009-12-23 | 2010-06-23 | 北京格林伟迪科技有限公司 | Remote meter reading method and device based on power line |
| CN103297188A (en) * | 2012-02-22 | 2013-09-11 | 德克萨斯仪器股份有限公司 | Transmission of segmented frames in power line communication |
| CN103746786A (en) * | 2014-01-10 | 2014-04-23 | 中国人民解放军重庆通信学院 | OFDM (orthogonal frequency division multiplexing) frame design suitable for transmission of zero crossing point of power line communication |
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| US9537533B2 (en) * | 2012-10-18 | 2017-01-03 | Texas Instruments Incorporated | PLC FCH unitary circle differential symbol and preamble encoding determination |
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| CN101751766A (en) * | 2009-12-23 | 2010-06-23 | 北京格林伟迪科技有限公司 | Remote meter reading method and device based on power line |
| CN103297188A (en) * | 2012-02-22 | 2013-09-11 | 德克萨斯仪器股份有限公司 | Transmission of segmented frames in power line communication |
| CN103746786A (en) * | 2014-01-10 | 2014-04-23 | 中国人民解放军重庆通信学院 | OFDM (orthogonal frequency division multiplexing) frame design suitable for transmission of zero crossing point of power line communication |
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