CN1388654A - Digital pulse interval-modulated power line carrier communication method and its transceiving method - Google Patents
Digital pulse interval-modulated power line carrier communication method and its transceiving method Download PDFInfo
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- CN1388654A CN1388654A CN 02134233 CN02134233A CN1388654A CN 1388654 A CN1388654 A CN 1388654A CN 02134233 CN02134233 CN 02134233 CN 02134233 A CN02134233 A CN 02134233A CN 1388654 A CN1388654 A CN 1388654A
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Abstract
The present invention is carrier digital pulse interval modulation (C-DPIM) communication method and transceiver in power line. The DPIM pulse is generated with linear frequency scanning SSC bandspread carrier of 50-535 KHz narrow band carrier signal sequence and is encoded via pulse interval. Pulse leading code is introduced as the synchronizing signal of transmitted data block to prevent error transmission. Monochip computer is used in the C-DPIM communication. Power line carrier communication interface transceiver is developed and may be used in realizing ideal power line carrier communication.
Description
Technical field
The present invention relates to a kind of carrier number word pulse and modulate C-DPIM (carrier digital pulse intervalmodulation) power line data communications method and R-T unit at interval.
Background technology
The low-voltage power network is developed to is the information Access Network, it is low to utilize electrical network to carry out the new technology cost of data communication reliably at a high speed, and it is convenient to implement, and is the focus of present people's research.At present, computer, the communication technology, microcontroller technology combine and infiltration with the close of consumption electronic product, make home electric production progressively step into home automation, and the organic integration of Internet appliance product has then formed home network.In home network, its transmission signals can be divided into two classes, and the one, low speed signal, the less demanding water, electricity, gas amr message of, real-time less, the control of traditional home appliance such as electric light, air-conditioning, information such as antitheft, fireproof alarming as control command and data volume.Another kind is a high speed signal, as video, audio signal etc.
Because the time variation of low-voltage power spider lines, decay are big (when especially electrical load is capacitive, the carrier communication signal is close to short circuit) and the existence of various complicated disturbance noises, make that power-line carrier communication is difficult to be applied for a long time at home.Utilize low-tension network to carry out carrier communication, the power carrier special chip that adopts has LM1893 at present, ST7536, ST7537 etc., though they have taked some interference protection measures at the characteristic of channel of power line, its modulation-demodulation technique that adopts is the FSK mode that falls behind, the communications distance is still shorter, in the distance range of hundreds of rice, be difficult to accomplish normal reception, can't transmit information during peak of power consumption and cause the paralysis, do not reach practical requirement.SSC P300 is the power line carrier MODEM chip that INTELLON company adopts up-to-date communication technology design, it has adopted spread spectrum (CHIRP mode) modulation-demodulation technique, the CEBUS agreement of Modern DSP technology and standard, but its power line carrier communication result of use in field and not obvious such as check meter at home.Trace it to its cause, SSC P300 designs at north America region frequency standard, electrical network characteristic and home automation (single household's formula separate house).Owing to have the strong narrow band interference and the background noise of 50HZ and multiple frequency signal thereof on the power line, China does not have American-European strict to the control of mains by harmonics in addition, the domestic electrical network characteristic of power line private communication chip technology and method incompatibility realizes normal data communication both at home and abroad when also not having a kind of real suitable China's low-voltage powerline carrier communication chip technology electrical network characteristic, reasonable price and method can accomplish to reach peak of power consumption in the distance range of hundreds of rice at present.
Summary of the invention
The purpose of this invention is to provide a kind of power line data communications method and R-T unit that is applicable to China's power line electrical network characteristic, background noise and the periodicity strong jamming complicated and changeable to power line network have strong inhibitory action, compare with existing power line data communications method, aspect the ratio of performance to price, be significantly improved.
The technical solution adopted in the present invention: adopt linear frequency sweep Chirp extension frequency carrier to modulate C-DPIM (carrier digital pulse interval modulation) communication means at interval and on power line or other wire communication medium, realize data communication as the carrier number word pulse of pulse capture signal.This method comprise transmitting terminal to data source encode, signal modulation and sending, receiving terminal is to the reception and the data decode of signal.Sending method comprises:
1) at first converts data source to Log
2N is a N-DPIM Frame data symbol.N is interior contained maximum basic time slot (slot) number of the time interval between two pulses.The signal node composition of DPIM as shown in Figure 1,1 expression " K DPIM Frame ", 2 expressions " N basic time slot ", 3 represent " linear frequency sweep Chirp carrier wave ".For fear of the influence of disturbing, additional basic time slot is as boundary belt after each DPIM pulse.Each symbol begins with a DPIM pulse, followed by be sent out the corresponding basic time slot of data decimal number (slot) number.Time slot width equals a DPIM pulse duration, i.e. the duration of each linear frequency sweep Chirp burst.Every Log of DPIM
2N numerical digit is mapped in N the possible symbol, and for example, when N=4, it is as shown in table 1 that source data converts N-DPIM Frame data symbol principle to.
2) produce the DPIM signal according to switched N-DPIM Frame data symbol.The time interval between i.e. two pulses of the length of DPIM Frame changes along with the difference that sends data, and DPIM Frame gap length has been represented the information that will transmit.Comprise a lead code among every K the DPIM Frame, it occupies a DPIM Frame, but its pulse spacing length is fixed as 3N.Define a data block (block) and form, be i.e. Log by K-1 DPIM Frame
2N takes advantage of K-1 binary data bit.Thereby a data block includes K-1 pulse and a lead code pulse, and block length changes between 3N+NK-1 and 3N+K-1.
3), by the DPIM pulse-triggered and produce the carrier signal sequence, be coupled to power line or other wire communication medium transmission through the power line signal coupling circuit according to the DPIM signal that has produced.Patent of the present invention has been selected to be used to catch the carrier signal of pulse spacing modulating pulse and has been made up of several linear frequency sweeps Chirp waveform.This Chirp has fixed mode, can be received by online arbitrary node.These Chirp waveforms have covered the frequency band of 200kHz--350kHz, and always begin linearity with 200kHz and scan 350kHz and finish, and are about 50us during this period of time.This Chirp waveform has very strong autocorrelation performance, and all equipment on the network of being connected can be discerned this distinct waveforms that any apparatus is from network sent simultaneously, need not carry out between transmitting and receiving device synchronously.The narrowband carrier signal that the present invention adopts 35KHZ-535KHZ is as the pulse capture signal of DPIM electric line communication system or with the linear frequency sweep Chirp waveform of the 100KHZ-400KHZ that meets the CEBUS agreement pulse capture signal as the DPIM electric line communication system.
Method of reseptance is: by the carrier monitoring device linear frequency sweep Chirp signal of DPIM carrier signal is carried out correlation filtering and detect, if receive the linear frequency sweep Chirp burst that is complementary with linear frequency sweep Chirp coherent detection filter mode, then produce a DPIM pulse by the carrier monitoring device, and then adjudicate by single-chip microcomputer, detect the lead code and the numeric data code of DPIM data block.After receiving a data block, obtain the decoding of DPIM system data by the interval location of estimating the DPIM pulse.The carrier monitoring device can adopt SSC P485 or LM1893 chip to realize.
Use said method, we have developed a kind of carrier number word pulse modulation electric line of force transceiver communication device at interval.This device is by power line carrier signal coupling circuit, power amplification, carrier signal transtation mission circuit, and the carrier signal circuit that accepts filter, carrier signal correlation detecting circuit (being the carrier monitoring device), the singlechip controller circuit interconnects and forms (as shown in Figure 2).Physical circuit is connected to: power line carrier signal coupling circuit is in series with the elementary of coupling transformer T1 after by a resistance capacitance R16, C22 parallel connection; Constitute power amplification, carrier signal transtation mission circuit by ternary computing amplification circuit IC3 and AC signal coupling circuit C10, RI1, output the 3rd, 6 pin of IC3 are connected with the secondary of transformer T1 through AC signal coupling circuit C10, RI1, the 6th and 11 pin of R100 cross-over connection IC3, the 9th pin of IC3 connects the collector electrode of Q10, and the 11st pin links to each other with the 14th pin of IC2 after R12 and C11 serial connection; NPN transistor amplifier (Q2, R9, R15, D1, Q4, input R10) connect π type low pass filter (L3, C17, C18), again through high pass filter (C15, L4), surge absorbing circuit (D4, D5), the clamped circuit (D2 of level, D3) be connected with the secondary of transformer T1, the collector electrode of Q2 connects the 11st pin of IC2, forms the carrier signal circuit that accepts filter; Integrated circuit (IC) 2, R103, R104 etc. constitute the carrier monitoring device, and R103 connects the 6th, 19 pin of IC2, and the 6th pin of integrated circuit (IC) 2 connects power supply through R104, and the 11st pin of IC2 connects the base stage of Q10 through R102, and the 17th pin links to each other with the collector electrode of Q2; The 6th pin of single-chip microcomputer integrated circuit (IC) 1 links to each other with the 7th pin of IC2, and the 7th pin links to each other with the 8th pin of IC2, and the 8th pin links to each other with the 12nd pin of IC2.
During transmission, the data transaction that single-chip microcomputer will send becomes the DPIM sign indicating number, and link to each other with the 8th pin of IC2 from the 7th pin output DPIM pulsing control signal, IC2 receives behind this signal that from the 14th pin outgoing carrier signal through C11, RI2 links to each other and is coupled on the power line with power amplification, carrier signal transtation mission circuit and power line carrier signal coupling circuit and transmits.
During reception, carrier wave Chirp waveform signal links to each other with the 17th pin of carrier monitoring device IC circuit 2 through power line carrier signal coupling circuit, the carrier signal circuit that accepts filter, the carrier monitoring device receives that the laggard line correlation of this signal detects judgement outgoing carrier monitor signal and links to each other with single-chip microcomputer the 6th pin through the 7th pin, single-chip microcomputer is received behind this signal and further to be finished the decoding of DPIM signal by software with this pulse signal as DPIM.
Pulse spacing modulation DPIM (digital pulse interval modulation) is a kind of modification of PPM (pulse positionmodulation), it be not by one fixedly among the Frame position of pulse come transmission information, but come transmission information with the size in adjacent two interpulse time intervals, can adopt that the chip microcontroller digit pulse is modulated at interval, the identification of carrier signal sequence, the strong narrow band interference of 50HZ on the power line and multiple frequency signal thereof is had extremely strong inhibitory action.On the other hand, owing to adopted linear frequency sweep Chirp spread spectrum technic, improved the inhibition ability that communication system is disturbed the power line network background noise, even carrier signal is flooded by noise, also can correctly detect the appearance of carrier signal at receiving terminal, the communication error rate is descended, and reliability improves greatly.
A large amount of experiment and analysis results show that it is stronger to the interference rejection capability of low-voltage power spider lines that carrier number word pulse of the present invention is modulated C-DPIM power line data communications method at interval, and communication efficiency is better.Make that it becomes when being, high signal attenuation characteristic and have the train-installed low-voltage power spider lines of complicated disturbance and work-at-home low-voltage power spider lines on realized desirable communication, with compare based on CEBUS protocol of I NTELLON SSC P300 chip technology, the communication error rate has obvious reduction, can realize the low speed signal transmission such as functions such as remote data collections under a lot of powerline network environment that adopt INTELLON SSC P300 chip can not realize correct communication, transmission speed can reach 5KBPS at present.The C-DPIM power-line carrier communication has a wide range of applications in industrial automation field bus control system, family's building automation system, long-distance meter-reading system.
Adopt said method and carrier number word pulse interval modulation electric line of force transceiver communication device to do the mass communication experiment at experiment building, residential quarters, train 380V low-voltage power spider lines, effect is obvious.The continuous experimental period of each experiment is 17 hours, and total bit number of transmission is 10000000.Carry out the microcomputer chamber of 380V power line network communication experiment in disturbing bigger 20m scope, experiment building, and C-DPIM R-T unit and SSC P300 transceiver (CEBUS agreement) transmission error rates are respectively 0.09% and 18.5%.Two communication point of experiment building 380V power line network communication experiment in building, Building to five 1, building 350m line scope are carried out, and C-DPIM R-T unit and SSC P300 transceiver (CEBUS agreement) transmission error rates are respectively 1.75% and 99.9%.Train 380V low-voltage power line network service experiment is carried out in adjacent two joint compartments, and C-DPIM R-T unit and SSC P300 transceiver (CEBUS agreement) transmission error rates are respectively 0.77% and 99.9%.Train 380V low-voltage power line network service experiment is carried out between two compartments of 4 joint cars that are separated by, and C-DPIM R-T unit and SSC P300 transceiver (CEBUS agreement) transmission error rates are respectively 2.79% and 100%.The result shows that in peak times of power consumption, the power line load increases, and signal attenuation is big, and disturbing increases, and transmission error rates rises.In addition, when communication distance increased, power line produced more high attenuation and distortion to signal, and transmission error rates is increased, thereby had caused the paralysis of SSC P300 communication system.And adopt carrier number word pulse of the present invention interval modulation electric line of force transceiver communication device under the bad environment of Malignant, still to have communication efficiency preferably.
Description of drawings
Fig. 1 is the signal node composition of DPIM.
Fig. 2 is a carrier number word pulse modulation electric line of force transceiver communication schematic diagram of device at interval.
Embodiment
Among Fig. 1,1 expression " K DPIM Frame ", 2 expressions " N basic time slot ", 3 expressions " linear frequency sweep Chirp carrier wave ".
Among Fig. 2, the model that single-chip microcomputer integrated circuit (IC) 1 adopts is P87PLC759, and the model that integrated circuit (IC) 2 adopts is SSC485, and the model that ternary computing amplification circuit IC3 adopts is TLE2310.
Table 1: source data converts N-DPIM Frame data symbol table to
Claims (3)
1, a kind of digit pulse modulation electric powerline carrier communication method at interval, it is characterized in that this method comprise transmitting terminal to data source encode, the signal modulation with send, receiving terminal is to the reception and the data decode of signal; Sending method comprises: 1) at first convert data source to Log
2N is a N-DPIM Frame data symbol, and N is interior contained maximum basic time slot (slot) number of the time interval between two pulses; 2) produce the DPIM signal according to switched N-DPIM Frame data symbol; 3), by the DPIM pulse-triggered and produce the carrier signal sequence, be coupled to power line or other wire communication medium transmission through the power line signal coupling circuit according to the DPIM signal that has produced; Method of reseptance is: by the carrier monitoring device linear frequency sweep Chirp signal of DPIM carrier signal is carried out correlation filtering and detect, if receive the linear frequency sweep Chirp burst that is complementary with linear frequency sweep Chirp coherent detection filter mode, then produce a DPIM pulse by the carrier monitoring device, and then adjudicate by single-chip microcomputer, detect the lead code and the numeric data code of DPIM data block, after receiving a data block, obtain the decoding of DPIM system data by the interval location of estimating the DPIM pulse.
2, a kind of digit pulse interval modulation electric powerline carrier communication R-T unit that uses the described method of claim 1, it is characterized in that this device is by power line carrier signal coupling circuit, power amplification, carrier signal transtation mission circuit, the carrier signal circuit that accepts filter, carrier signal correlation detecting circuit and singlechip controller circuit interconnect and form.
3, a kind of digit pulse as claimed in claim 2 modulation electric powerline carrier communication R-T unit at interval is characterized in that the physical circuit of this device is connected to: the power line signal coupling circuit is in series with the elementary of coupling transformer T1 after by a resistance capacitance R12, C22 parallel connection; By ternary computing amplification circuit IC3 and AC signal coupling circuit (C10, RI1) constitute power amplification, carrier signal transtation mission circuit, output the 3rd, 6 pin of IC3 are connected with the secondary of transformer T1 through AC signal coupling circuit C10, RI1, the 6th and 11 pin of R100 cross-over connection IC3, the 9th pin of IC3 connects the collector electrode of Q10, and the 11st pin links to each other with the 14th pin of IC2 after R12 and C11 serial connection; By NPN transistor amplifier (Q2, R9, R15, D1, Q4, input R10) connect π type low pass filter (L3, C17, C18), again through high pass filter (C15, L4), surge absorbing circuit (D4, D5), the clamped circuit (D2 of level, D3) be connected with the secondary of transformer T1, output connects the 11st pin of IC2, forms the carrier signal circuit that accepts filter; Integrated circuit (IC) 2 and R103, R104 constitute the carrier monitoring device, and R103 connects the 6th, 19 pin of IC2, and the 6th pin of integrated circuit (IC) 2 connects power supply through R104, and the 11st pin of IC2 connects the base stage of Q10 through R102, and the 17th pin links to each other with the collector electrode of Q2; The 6th pin of single-chip microcomputer integrated circuit (IC) 1 links to each other with the 7th pin of IC2, and the 7th pin links to each other with the 8th pin of IC2, and the 8th pin links to each other with the 12nd pin of IC2.
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| CN 02134233 CN1203624C (en) | 2002-06-25 | 2002-06-25 | Digital pulse interval-modulated power line carrier communication method and its transceiving method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1992546B (en) * | 2005-12-30 | 2010-10-13 | 杨华 | Intelligent power line carrier transmitting-receiving system |
| CN101267424B (en) * | 2008-02-26 | 2011-08-31 | 上海大学 | Ultra-broadband wireless communication modulation method based on scanning frequency pulse |
| CN102497219A (en) * | 2005-03-16 | 2012-06-13 | 美国亚德诺半导体公司 | System and method for power line communications |
| CN101651470B (en) * | 2008-08-07 | 2013-02-13 | 索尼株式会社 | Communication apparatus, transmission line communication chip and communication method |
| CN105245291A (en) * | 2014-07-07 | 2016-01-13 | 阿瓦亚公司 | Acoustic information transfer |
| CN107545717A (en) * | 2016-06-23 | 2018-01-05 | 瑞昱半导体股份有限公司 | Infrared ray learning device |
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2002
- 2002-06-25 CN CN 02134233 patent/CN1203624C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497219A (en) * | 2005-03-16 | 2012-06-13 | 美国亚德诺半导体公司 | System and method for power line communications |
| CN102497219B (en) * | 2005-03-16 | 2014-09-10 | 美国亚德诺半导体公司 | System and method for power line communications |
| CN1992546B (en) * | 2005-12-30 | 2010-10-13 | 杨华 | Intelligent power line carrier transmitting-receiving system |
| CN101267424B (en) * | 2008-02-26 | 2011-08-31 | 上海大学 | Ultra-broadband wireless communication modulation method based on scanning frequency pulse |
| CN101651470B (en) * | 2008-08-07 | 2013-02-13 | 索尼株式会社 | Communication apparatus, transmission line communication chip and communication method |
| CN105245291A (en) * | 2014-07-07 | 2016-01-13 | 阿瓦亚公司 | Acoustic information transfer |
| CN107545717A (en) * | 2016-06-23 | 2018-01-05 | 瑞昱半导体股份有限公司 | Infrared ray learning device |
| CN107545717B (en) * | 2016-06-23 | 2019-10-25 | 瑞昱半导体股份有限公司 | Infrared ray learning device |
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| CN1203624C (en) | 2005-05-25 |
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