CN103281279A - Realization method of electric power line carrier chip - Google Patents
Realization method of electric power line carrier chip Download PDFInfo
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- CN103281279A CN103281279A CN2013101794422A CN201310179442A CN103281279A CN 103281279 A CN103281279 A CN 103281279A CN 2013101794422 A CN2013101794422 A CN 2013101794422A CN 201310179442 A CN201310179442 A CN 201310179442A CN 103281279 A CN103281279 A CN 103281279A
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Abstract
The invention discloses a realization method of an electric power line carrier chip. The method adopts flooding networking to be realized on the basis of an OFDM (orthogonal frequency division multiplexing) modulation mode. In the method, a signal channel analysis circuit, a networking control circuit, an OFDM modulation circuit and a demodulation circuit are adopted, wherein the signal channel analysis circuit comprises a signal channel busy and idle monitoring unit, a noise monitoring unit and a fading monitoring unit, the networking control circuit comprises a networking parameter control unit, a communication rate control unit and an avoiding mechanism control unit, and the OFDM modulation circuit and the demodulation circuit are controlled by the signal channel analysis circuit and the networking control circuit. The realization method has the advantages that the blooding networking mode is combined with the characteristics of the OFDM modulation, the electric power line carrier communication speed is improved, the reliability and the stability are enhanced, and the practicability and the universality are realized.
Description
Technical field
The present invention relates to a kind of implementation method of power line carrier communication chip, particularly relate to a kind of chip based on OFDM modulation system and the networking of use inundation.
Background technology
Electric line carrier communication refers to the transmission line to be the communication of the transmission medium of signal, usually high-frequency signal (9kHz-500kHz) is coupled to (as 220v, the 50Hz alternating current) on the power line.OFDM (Orthogonal Frequency Division Multiplexing) is orthogonal frequency division multiplexi, its main thought is: channel is divided into some orthogonal sub-channels, convert high-speed data signal to parallel low speed sub data flow, be modulated at each subchannel and transmit.At present, check meter with the low pressure arrowband and be applied as main power line carrier communication and present following characteristics:
Low pressure arrowband power line carrier communication is mainly based on single-carrier modulated, and as FSK, BPSK, traffic rate exist traffic rate low usually at 0.1kbps-5kbps, the shortcoming that success rate is low.
Networking mode generally adopts static routing or based on the dynamic group net of inundation.Static networking needs long learning time, and the environment that becomes can not adapt to power line well the time.
The dynamic group net mode of inundation also has in the power line communication that is used in the single-carrier modulated mode, but because the shortcoming that the body of single carrier own exists can not reach gratifying effect in use.
Summary of the invention
At the shortcoming of existing carrier communication scheme, the invention provides a kind of implementation method of low-voltage powerline carrier communication chip.This implementation method is applicable to the power line carrier communication of multinode, and highly reliable, high-speed communication can be provided, and makes the networking mode of inundation be used for the OFDM modulation, and makes it to become an organic combination closely.Chip of scheme especially is fit to and use power line communication fields such as power line carrier is checked meter, Smart Home, Industry Control in this.
A kind of power line carrier chip implementation method based on the OFDM modulation system of using the inundation networking provided by the invention, its improvements are that described method comprises the steps:
When not having carrier signal on the power line:
1) information on the analog sampling circuit power line, by ofdm demodulator, the Multiple Channel Analysis machine obtains real time information on the power line again;
2) according to the real time information of obtaining, by suitable algorithm, obtain noise, the attenuation of different frequency range on the power line;
3) the Multiple Channel Analysis machine is adjusted the synchronous and equilibrium in the OFDM demodulation according to noise, the attenuation of current time;
4) simultaneously, the Multiple Channel Analysis machine sends to the networking controller to the noise of current time, attenuation;
5) the networking controller is adjusted the networking parameter in real time according to the information that the Multiple Channel Analysis machine sends, in order to sending data;
When having carrier signal on the power line:
1) analog circuit receives signal, and by the OFDM demodulation, obtains data and send to the user
2) simultaneously, the information that the Multiple Channel Analysis machine obtains by the OFDM demodulation is analyzed noise, decay, distorted signals on the power line;
3) the power line channel information obtained according to the Multiple Channel Analysis machine of networking controller, the power line channel situation was revised the networking parameter again when comparison had carrier-less signal, had been sent out data
When being ready for sending data
1) obtains transmission information from user interface, and send this networking controller;
2) networking controller according to depositing the real-time electric power line channel information that networking parameter and Multiple Channel Analysis machine obtain, is revised in real time and is sent relevant parameter;
3) by dodging mechanism, data are sent on the power line
The invention has the beneficial effects as follows
1. the present invention organically combines inundation networking mode and OFDM modulation system.The high speed of OFDM modulation, reliable advantage, combine with advantages such as need not the learning of inundation networking, intelligent relaying, two-way communications, make the power line communication of multinode, large coverage quick more and reliable.
2. the present invention receives parameter, transmission parameter and networking parameter to physical layer and adjusts in real time by the real-time sense of physical layer to power line channel, has strengthened the adaptive capacity to power line network, has improved the communication success rate.
3. the networking parameter is based on physical layer parameter among the present invention, according to the adjustment of physical layer parameter, adopts different networking parameters.Therefore can utilize power line channel transmission data better.
4. the mechanism of dodging that the present invention adopts by priority, send at random, end, cancel and forming, networking mode is science more, has reduced data packet collision greatly.
Description of drawings
Fig. 1 is the carrier chip block diagram
Fig. 2 is OFDM demodulation block diagram
Fig. 3 is Multiple Channel Analysis machine frame figure
Fig. 4 is networking controller block diagram
Fig. 5 is OFDM demodulation block diagram
Fig. 6 dodges machine-processed flow chart for sending
Concrete technical scheme of the present invention:
Working mechanism of the present invention adopts and intercepts the mechanism that afterwards sends earlier, namely intercepts power line channel earlier, sends according to the user then and asks and the transmission of selecting a good opportunity of power line channel condition.
Referring to Fig. 1, Fig. 2, Fig. 3, receiving on the path, analog circuit is finished the amplification of signal, behind analog filtering, is converted to digital signal and sends to the OFDM demodulation, and concrete demodulation flow process is seen Fig. 2, and each several part is described as follows.
Described synchronous AGC carries out synchronously and by the AGC algorithm amplifier in the analog circuit being controlled to the digital signal that analog circuit is finished after the analog-to-digital conversion.Comprise that synchronously sign synchronization, Frequency Synchronization, sampling clock are synchronous.
The described CP of going is the Cyclic Prefix that removes the OFDM symbol.
Described FFT is fast Fourier transform.
Described equilibrium is to the ISI(intersymbol interference) with the ICI(interchannel interference) elimination.
Described subcarrier demodulation is the solution mapping of subcarrier, as BPSK, QPSK, 16QAM are separated mapping.
Described deinterleaving, decoding are data to be carried out reciprocal cross knit coding and separate chnnel coding.
The user data that obtains after the demodulation during described data.
The Multiple Channel Analysis machine of Fig. 3 is finished the signal analysis of channel and demodulation control, and relevant information is issued the networking controller.Fig. 3 each several part is described as follows.
Not busy busy the intercepting of described channel is to the analysis of OFDM demodulated data, judged whether that the carrier data bag is just in the enterprising news that work of power line.
Described band noise monitoring is that the frequency band that carrier communication is used is monitored, and analyzes the noise size of each frequency in the frequency band, then according to the noise size, adjusts the parameter of AGC algorithm, synchronized algorithm.
Described band attenuation monitoring is that the frequency band that carrier communication is used is monitored, and analyzes the decline situation of each frequency in the frequency band, then according to the decline situation, adjusts the parameter of AGC algorithm, synchronized algorithm.
Described frequency band distortion detection is that the frequency band that carrier communication is used is monitored, and analyzes the distortion situation of current channel, then according to the distortion situation, adjusts the parameter of equalization algorithm.
By above step, can finish intercepting carrier signal.After the user data that receives is issued application layer, send data if desired, so just start transmission path.As Fig. 4, Fig. 5, shown in Figure 6, the specific implementation method is as follows.
Data as described in Figure 4 are data that application layer issues.
Described coding, to interweave be chnnel coding and interweaving encoding.Chnnel coding such as convolution code, RS sign indicating number etc., interweaving encoding can be adjusted interleaving degree according to actual needs.
Described subcarrier-modulated is the modulation system of each subcarrier among the OFDM, can be BPSK, QPSK, 16QAM etc.
Described IFFT is anti-fast Fourier transform.
The described CP of adding is that the OFDM symbol adds Cyclic Prefix.
The described pilot tone, framing of adding is to increase the training pilot tone, increases the time domain spread spectrum, after finish the final data frame.
During the control of as described in Figure 5 physical layer parameter according to the Multiple Channel Analysis machine send about interchannel noise, decay, distortion situation, and with reference to after the last networking parameter, come chnnel coding, interleaving mode, subcarrier-modulated in the control chart 4, the parameter of training pilot tone, time domain spread spectrum etc.
The control of described networking parameter is the parameter according to physical layer, adjusts the networking parameter---relaying sends number of times, packet life cycle, the length of priority time, the span of transmitting time etc. at random.
Transmission is dodged mechanism as Fig. 6, and the described free time refers to not find the carrier data bag on the power line, and carrier chip is in the state of intercepting.
Described busy be that carrier communication is just being arranged on the power line, this chip is receiving this packet.
Described priority is according to bag type, priority time of wait-for-response and then enter the transmission state.
The described transmission at random is not find carrier signal after entering the transmission state, waits for that then a random time sends data.
Described being sent completely is that packet sends on the power line.
Described termination is that application layer is sent the carrier data that instruction stops to send.
Described cancellation is to stop to be in the transmission that priority is waited for, sent the packet of state at random.
The workflow of Fig. 6 is as follows.Chip is in idle condition generally speaking, intercepts whether carrier signal is arranged on the power line.When finding signal, begin to receive, be in busy state; When finishing receiving, if application layer does not send request, then enter idle condition, if the request of sending is arranged then enter the priority wait state.If bide one's time in priority etc., application layer send the cancellation instruction then cancellation send; If cancellation instruction, and the stand-by period arrive, then enter the state that sends at random.When sending state at random, if when waiting at random a transmitting time, be employed layer cancellation and send, then enter the cancellation state; If the stand-by period arrives, then begin to send; If when sending, the application layer cancellation sends, and then enters abort state, is sent completely state, the idle condition of entering then if send to finish.
Above-described implementation method is only in order to illustrate that technical scheme of the present invention is not intended to limit, if the specific embodiment of the present invention is made amendment or is equal to replacement, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, all should be encompassed in the middle of the claim scope of the present invention.
Claims (4)
1. the implementation method of a power line carrier chip is finished the power line carrier communication of physical layer by the OFDM modulation system, finishes networking with the inundation mode, it is characterized in that: the power line carrier chip that the inundation network's mode is applied to the OFDM modulation system.
2. the implementation method of a kind of power line carrier chip as claimed in claim 1, it is characterized in that: physical layer parameter---chnnel coding, interleaving mode, subcarrier-modulated, training pilot tone, time domain spread spectrum based on to after the intercepting of power line channel, are considered relatively to obtain after the last networking parameter.
3. the implementation method of a kind of power line carrier chip as claimed in claim 1 is characterized in that: the networking parameter---relaying sends number of times, and the packet life cycle, the length of priority time, the span of transmitting time obtains based on physical layer parameter at random.
4. the implementation method of a kind of power line carrier chip as claimed in claim 1, it is characterized in that: mechanism is dodged in transmission as shown in Figure 6.
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| CN2013101794422A CN103281279A (en) | 2013-05-15 | 2013-05-15 | Realization method of electric power line carrier chip |
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| CN2013101794422A CN103281279A (en) | 2013-05-15 | 2013-05-15 | Realization method of electric power line carrier chip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539317A (en) * | 2015-02-09 | 2015-04-22 | 北京华强智连微电子有限责任公司 | Dual-mode communication chip of OFDM carrier wave mode and GFSK wireless mode |
| CN104868910A (en) * | 2015-06-17 | 2015-08-26 | 北京华强智连微电子有限责任公司 | Delay circuit adopting structure in which phase inverters are overlapped in staggered manner |
| CN110956795A (en) * | 2019-11-14 | 2020-04-03 | 安徽科技学院 | Power data acquisition method based on power line carrier technology |
| CN113938160A (en) * | 2021-09-30 | 2022-01-14 | 海南电网有限责任公司 | Remote communication and online verification scheme research of small water and electricity terminal without signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6522626B1 (en) * | 1998-12-15 | 2003-02-18 | Nortel Networks Limited | Power line communications system and method of operation thereof |
| CN102857257A (en) * | 2011-06-30 | 2013-01-02 | 美国博通公司 | Power line communication device |
| CN102970372A (en) * | 2012-12-04 | 2013-03-13 | 威胜集团有限公司 | Remote upgrade method for carrier communication module of automatic meter reading system |
-
2013
- 2013-05-15 CN CN2013101794422A patent/CN103281279A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6522626B1 (en) * | 1998-12-15 | 2003-02-18 | Nortel Networks Limited | Power line communications system and method of operation thereof |
| CN102857257A (en) * | 2011-06-30 | 2013-01-02 | 美国博通公司 | Power line communication device |
| CN102970372A (en) * | 2012-12-04 | 2013-03-13 | 威胜集团有限公司 | Remote upgrade method for carrier communication module of automatic meter reading system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539317A (en) * | 2015-02-09 | 2015-04-22 | 北京华强智连微电子有限责任公司 | Dual-mode communication chip of OFDM carrier wave mode and GFSK wireless mode |
| CN104868910A (en) * | 2015-06-17 | 2015-08-26 | 北京华强智连微电子有限责任公司 | Delay circuit adopting structure in which phase inverters are overlapped in staggered manner |
| CN110956795A (en) * | 2019-11-14 | 2020-04-03 | 安徽科技学院 | Power data acquisition method based on power line carrier technology |
| CN113938160A (en) * | 2021-09-30 | 2022-01-14 | 海南电网有限责任公司 | Remote communication and online verification scheme research of small water and electricity terminal without signal |
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Application publication date: 20130904 |