CN104917713A - 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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- CN104917713A CN104917713A CN201510227494.1A CN201510227494A CN104917713A CN 104917713 A CN104917713 A CN 104917713A CN 201510227494 A CN201510227494 A CN 201510227494A CN 104917713 A CN104917713 A CN 104917713A
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- frame message
- power frequency
- zero point
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- frequency transmission
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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
Abstract
The invention discloses a narrowband power line communication power-frequency zero transmission method based on OFDM modulation, comprising the following steps: confirming an original message needing to be processed and sent by a physical layer; forming a frame message; judging whether or not to send the frame message according to a power-frequency zero transmission mode; configuring the format of the frame message; regularly sending the configured frame message; sending the frame message according to a continuous transmission mode in the original G3-PLC standard; regularly sending the configured frame message; judging whether or not to receive the frame message according to the power-frequency zero transmission mode; demodulating the received data according to OFDM demodulation and FEC decoding modes in the G3-PLC standard; demodulating the received data according to OFDM demodulation and FEC decoding modes in the G3-PLC standard; and obtaining a receiving-end demodulation message, and completing receiving and processing tasks of the physical layer. The method of the invention ensures high communication rate while being compatible with international standards.
Description
Technical field
The present invention relates to a kind of transmission method, particularly relate to a kind of arrowband power line communication power frequency transmission method at zero point based on OFDM modulation.
Background technology
Power-line carrier communication utilizes power line to carry out a kind of communication mode of transfer of data as medium, has natural advantage.Along with the progressively foundation of national intelligent grid, voltage power-line carrier communication technology obtains deep application at electric energy and various energy measurement field, and the range of application of power line carrier communication in fields such as household electrical appliance Automated condtrol and prospect will be very extensive, therefore, power line carrier communication has huge economic benefit and significant social benefit.
OFDM (Orthogonal Frequency Division Multiplexing, be abbreviated as OFDM) be a kind of special multi-carrier signal modulator approach, compared with the single-carrier modulated modes such as original FSK, PSK, improve traffic rate, and can effective contrary frequency Selective intensity, there is higher noise robustness, be more suitable for power line channel environment.Series of standards has been formulated in the world at present for low pressure arrowband power line communication, as ITU-T G.990x series standard, IEEE Std 1901.2 standard, G3-PLC standard, PRIME standard etc., all have employed OFDM modulation technology, and ITU-T G.9903 with IEEE Std 1901.2 standard all based on G3-PLC standard formulation, be the affirmative to this standard technique.But; because China Power Grids distribution is extensive, population in use is numerous; and a lot of area exists circuit irregularity, power utilization environment noise is large, and supply district is large; spread of voltage; the problems such as defective earth leakage protective device easily trips, these are with external, and the power grid environment of especially American-European power line communication relatively fast developed area is completely different; therefore need to improve G3-PLC standard according to China Power Grids environment, thus play better communication performance.
Due at industrial frequency AC near zero-crossing point, various interference and noise are relatively little, channel circumstance is cleaner, be more suitable for transfer of data, and current international relevant criterion does not all consider power frequency transmission mode at zero point, therefore, the present invention increases power frequency transmission technology at zero point on the basis of G3-PLC standard, only at power frequency near zero-crossing point signal transmission, other periods do not transmit.It is lower that power frequency transmission at zero point exports requirement to the power of sending node, the cost of device capable of reducing power source, and meanwhile, the intermittent carrier signal sent can effectively avoid earth leakage circuit-breaker mistrip.Further, the present invention can original continuous transmission mode in compatible G3-PLC standard.
The Chinese invention patent of number of patent application 201410011148.5 discloses a kind of OFDM frame design being adapted to the transmission of power line communication zero crossing, this design is also adopt mode ac zero-crossing point region on power line of OFDM to carry out the burst communication of data, but the communication standard that this invention cannot be compatible international relevant, and its FFT to count be 1024 points, sample frequency is 2MHz, realization is more complicated compared with G3-PLC standard, and cannot ensure its hardware circuit communication performance.
Simultaneously, the Chinese invention patent of number of patent application 20120378047.2 discloses a kind of high speed carrier communication technology being applicable to low-voltage power line, based on electric main power frequency simultaneous techniques, but its system is based on FSK spread spectrum carrier communication technology, compared with OFDM modulation technology, speed is lower, cannot meet the requirement of intelligent grid and household intelligent control big data quantity, two-forty.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of arrowband power line communication power frequency transmission method at zero point based on OFDM modulation, it is while compatible international standard, communication system is made to be more suitable for China Power Grids environment, improve the noise robustness of system, ensure that higher traffic rate simultaneously.
The present invention solves above-mentioned technical problem by following technical proposals: a kind of arrowband power line communication power frequency transmission method at zero point based on OFDM modulation, and it is characterized in that, it comprises the following steps:
Step one: confirm the original message that physical layer needs process and sends;
Step 2: carry out FEC coding and OFDM modulation to original message according to G3-PLC standard, forms frame message;
Step 3: according to system requirements, judges whether according to power frequency transmission mode at zero point transmission frame message;
Step 4: if needed according to power frequency transmission mode at zero point transmission frame message, then first configure frame message format;
Step 5: according to power frequency transmission mode at zero point, the frame message that timed sending configures;
Step 6: if do not need according to power frequency transmission mode at zero point transmission frame message, namely according to the continuous transmission mode transmission frame message in former G3-PLC standard, configuration frame message format;
Step 7: according to continuous transmission mode, the frame message that timed sending configures;
Step 8: receiving terminal adaptive reception frame message, by judging the relation of leading character end position and power frequency zero point, judges whether according to power frequency transmission mode at zero point received frame message;
Step 9: according to power frequency transmission mode at zero point, according to frame message format configuring condition, according to the OFDM demodulation in G3-PLC standard 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 demodulation in G3-PLC standard and fec decoder mode demodulate reception data;
Step 11: obtain receiving terminal demodulation message, completes physical layer and receives and process.
Preferably, the frame message format of described step 4 and the frame message format of step 6 all comprise the configuration of leading character, synchronous head and data.
Preferably, the transmitting terminal of described step 5 controls certain phase place power frequency dead-center position in three-phase when sending signal, is just positioned at the centre position of leading character.
Preferably, the transmitting terminal of described step 7 controls leading character end position when sending signal, is just positioned at the power frequency dead-center position of this phase place.
Preferably, if described step 8 meets ± △=3.33 × N+1.44 ± 0.2 (ms), then power frequency transmission mode at zero point is thought; If meet △=3.33 × N ± 0.2 (ms), then think continuous transmission mode.
Positive progressive effect of the present invention is: the present invention is while compatible international standard, communication system is made to be more suitable for China Power Grids environment, improve the noise robustness of system, ensure that higher traffic rate simultaneously, in addition can the former high velocity, low pressure narrow-band power line carrier communication system based on OFDM modulation of compatible Qingdao Eastsoft Communication Technology Co., Ltd..
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is power frequency transmission mode at zero point schematic diagram of the present invention.
Fig. 2 is the schematic flow sheet of the arrowband power line communication method based on OFDM modulation of the present invention.
Fig. 3 is data frame structure schematic diagram.
Fig. 4 is the configuration schematic diagram of synchronous head and data in power frequency transmission mode at zero point of the present invention.
Fig. 5 is power frequency transmission mode at zero point timed sending leading character position view of the present invention.
Fig. 6 is continuous transmission mode timed sending leading character position view of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
As shown in Figure 1, because China Power Grids power frequency is 50Hz, the corresponding cycle is 20ms, under power frequency transmission mode at zero point, the present invention is in units of power frequency half period 10ms, power line channel is divided into multiple period synchronous with power frequency, each period centered by power frequency zero crossing, signal transmission within the time period (being about 3.33ms) being no more than the power frequency half period 1/3rd.The duration of the leading character of physical layer frame, synchronous head and data was all limited in the above-mentioned time period, but can be split as multiple time period and transmit.Power frequency transmission mode at zero point needs chip exterior zero crossing circuitry to add chip internal zero passage timer jointly to complete, and zero passage timer, zero signal being detected after at every turn, resets Counter Value and again adds up, so that calculate power frequency dead-center position relation.
As shown in Figure 2, the present embodiment provides a kind of arrowband power line communication power frequency transmission method at zero point based on OFDM modulation, comprises the steps:
Step 1: confirm the original message that physical layer needs process and sends.
Step 2: carry out FEC coding and OFDM modulation to original message according to G3-PLC standard, forms frame message.
Frame message refers to two kinds of frame types that G3-PLC standard physical layer is supported: Frame and acknowledgement frame.Frame is the elementary cell of transmitting data in physical layer, and it is made up of leading character (Preamble), synchronous head (FCH) and data (Payload), as shown in Figure 3.Acknowledgement frame then only comprises targeting signal and frame synchronization head.
Generally, the leading character of Frame is made up of 9.5 OFDM symbol, and be specially 8 identical SYNCP symbols and 1.5 identical SYNCM symbol compositions, wherein each symbol duration is 640us, and it is 6.08ms that leading character continues total time; Synchronous head is made up of 13 OFDM symbol; Data symbol length is according to actual conditions variable-length, and wherein synchronous head and each symbol duration of data are 695us.
Leading character is mainly used in AGC and adapts to adjustment, sign synchronization, channel estimating and initial phase with reference to estimating, each SYNCP symbol and SYNCM symbol are 256 sampled points, SYNCM symbol is identical with SYNCP symbol, just all subcarriers all carry out π phase shift, namely SYNCP only represents that symbol is multiplied by+1, SYNCM and represents that symbol is multiplied by-1.
Step 3: according to system requirements, judges whether according to power frequency transmission mode at zero point transmission frame message.
Step 4: if needed according to power frequency transmission mode at zero point transmission frame message, then first configure frame message format, frame message format comprises the configuration of leading character, synchronous head and data.
Wherein leading character can be configured to 4.5 × M OFDM symbol, the duration of each power frequency slot transmission at zero point leading character is: 4.5 × 640us=2.88ms, M represents the required power frequency zero number of leading character transmission, both 1 can be got, also other integers can be got, object improves synchronization dependability and estimates for AGC locking, SNR, if M > 1, then front M-1 power frequency time slot at zero point sends 4.5 or 4 SYNCP symbols, last power frequency time slot at zero point, send 3 SYNCP symbols and 1.5 SYNCM symbols, amount to 4.5 symbols.
Wherein the configuration of synchronous head and data as shown in Figure 4, each power frequency slot transmission at zero point 1 SYNCP symbol and 3 synchronous heads or data symbol, duration is 1 × 640us+3 × 695us=2.725ms, and power frequency is positioned at the centre position of these 4 symbols zero point just.Under this transmission mode, synchronous head and the synchronous of data are made up of two parts:
(1) leading character terminate after by 10ms fixed response time time;
(2) SYNCP at each power frequency zero point is used for synchronous, provides fixed phase, for differential ference spiral to synchronous head or data symbol simultaneously.
Step 5: according to power frequency transmission mode at zero point, the frame message that timed sending configures, as shown in Figure 5, transmitting terminal controls certain phase place power frequency dead-center position in three-phase when sending signal, is just positioned at the centre position of leading character.Now without the need to the transmission at zero point of this phase, also configurable selection, thus the low signal-to-noise ratio situation taking into account receiving terminal.
Step 6: if do not need according to power frequency transmission mode at zero point transmission frame message, namely according to the continuous transmission mode transmission frame message in former G3-PLC standard, configuration frame message format, comprises the configuration of leading character, synchronous head and data.
Wherein leading character number can be configured to 4.5 ~ 12.5 OFDM symbol, namely supports 3 ~ 11 SYNCP symbols and 1.5 SYNCM symbols, is defaulted as the parameter in G3-PLC standard.Better at channel circumstance, signal to noise ratio is higher, or under communication system stable case, receiving terminal uses 4.5 leading character symbols can complete synchronous and AGC adjustment, saves signal duration.
Synchronous head under continuous transmission mode and data still configure, without particular/special requirement according to G3-PLC mode standard.
Step 7: according to continuous transmission mode, the frame message that timed sending configures, as shown in Figure 6, transmitting terminal controls leading character end position when sending signal, is just positioned at the power frequency dead-center position of this phase place, and generally sends as early as possible, to improve system transfers efficiency.
Step 8: receiving terminal adaptive reception frame message, by judging the relation of leading character end position and power frequency zero point, judges whether according to power frequency transmission mode at zero point received frame message.
If meet ± △=3.33 × N+1.44 ± 0.2 (ms), then think power frequency transmission mode at zero point; If meet △=3.33 × N ± 0.2 (ms), then think continuous transmission mode.Wherein △ is after leading character reception terminates, the counters count time at zero point; 3.33ms is three-phase interval at zero point, and 0.2ms is zero passage detection and synchronized sampling error, 1.44ms for this phase to transmit zero point time, leading character end point and power frequency zero distance, N generally gets 0, also can equal 1 or 2.
Step 9: according to power frequency transmission mode at zero point, according to frame message format configuring condition, according to the OFDM demodulation in G3-PLC standard 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 demodulation in G3-PLC standard and fec decoder mode demodulate reception data.
Step 11: obtain receiving terminal demodulation message, completes physical layer and receives and process.
The present invention is through theory analysis, algorithm simulating, FPGA test and chip testing, and system communication performance is better than other existing technology, and traffic rate is higher than other existing single carrier communication technology, can meet the demand of intelligent grid and household intelligent control completely.
Above-described specific embodiment; the technical problem of solution of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1., based on an arrowband power line communication power frequency transmission method at zero point for OFDM modulation, it is characterized in that, it comprises the following steps:
Step one: confirm the original message that physical layer needs process and sends;
Step 2: carry out FEC coding and OFDM modulation to original message according to G3-PLC standard, forms frame message;
Step 3: according to system requirements, judges whether according to power frequency transmission mode at zero point transmission frame message;
Step 4: if needed according to power frequency transmission mode at zero point transmission frame message, then first configure frame message format;
Step 5: according to power frequency transmission mode at zero point, the frame message that timed sending configures;
Step 6: if do not need according to power frequency transmission mode at zero point transmission frame message, namely according to the continuous transmission mode transmission frame message in former G3-PLC standard, configuration frame message format;
Step 7: according to continuous transmission mode, the frame message that timed sending configures;
Step 8: receiving terminal adaptive reception frame message, by judging the relation of leading character end position and power frequency zero point, judges whether according to power frequency transmission mode at zero point received frame message;
Step 9: according to power frequency transmission mode at zero point, according to frame message format configuring condition, according to the OFDM demodulation in G3-PLC standard 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 demodulation in G3-PLC standard and fec decoder mode demodulate reception data;
Step 11: obtain receiving terminal demodulation message, completes physical layer and receives and process.
2., as claimed in claim 1 based on the arrowband power line communication power frequency transmission method at zero point of OFDM modulation, it is characterized in that, the frame message format of described step 4 and the frame message format of step 6 all comprise the configuration of leading character, synchronous head and data.
3. as claimed in claim 1 based on the arrowband power line communication power frequency transmission method at zero point of OFDM modulation, it is characterized in that, the transmitting terminal of described step 5 controls certain phase place power frequency dead-center position in three-phase when sending signal, is just positioned at the centre position of leading character.
4. as claimed in claim 1 based on the arrowband power line communication power frequency transmission method at zero point of OFDM modulation, it is characterized in that, the transmitting terminal of described step 7 controls leading character end position when sending signal, is just positioned at the power frequency dead-center position of this phase place.
5. as claimed in claim 1 based on the arrowband power line communication power frequency transmission method at zero point of OFDM modulation, it is characterized in that, if described step 8 meets ± △=3.33 × N+1.44 ± 0.2 (ms), then think power frequency transmission mode at zero point; If meet △=3.33 × N ± 0.2 (ms), then think continuous transmission mode.
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| CN105681243A (en) * | 2016-03-14 | 2016-06-15 | 中国科学院微电子研究所 | Frame timing synchronization method applied to broadband OFDM power line communication system |
| CN106936753A (en) * | 2015-12-31 | 2017-07-07 | 钜泉光电科技(上海)股份有限公司 | A kind of transmission method based on OFDM power line communications |
| 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 |
| CN108173799A (en) * | 2017-11-29 | 2018-06-15 | 深圳市力合微电子股份有限公司 | A kind of power-line carrier communication method based on frequency domain processing |
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