CN104539317A - Dual-mode communication chip of OFDM carrier wave mode and GFSK wireless mode - Google Patents
Dual-mode communication chip of OFDM carrier wave mode and GFSK wireless mode Download PDFInfo
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- CN104539317A CN104539317A CN201510013398.7A CN201510013398A CN104539317A CN 104539317 A CN104539317 A CN 104539317A CN 201510013398 A CN201510013398 A CN 201510013398A CN 104539317 A CN104539317 A CN 104539317A
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Abstract
The invention discloses a dual-mode communication chip of an OFDM power line carrier wave mode and a GFSK wireless mode. The dual-mode communication chip uses an OFDM modulation technique suitable for carrier wave meter reading and a GFSK modulation technique suitable for wireless meter reading simultaneously; the single dual-mode communication chip integrates a dual mode analog front end receiving circuit, a dual-mode modulation demodulator, a dual-mode carrier wave sensing collision detection CSMA unit, a CRC verification and forward error correction FEC unit, a storage and an interface unit, an sigma delta modulator, a phase-locked loop unit and a power amplifier unit, wherein the dual-mode analog front end receiving circuit comprises a frequency conversion and amplifying unit, a filtering unit and a analog-digital converter, and the dual-mode modulation demodulator comprises an OFDM modulation demodulator and a GFSK modulation demodulator. The integration level of the dual-mode communication chip is high, the single dual-mode communication chip can not only achieve the utilization of power line communication in an OFDM modulation manner, but also achieve the utilization of wireless communication in a GFSK modulation manner, the complexity of a system is lowered, and the success probability of meter reading of the electricity information collection system can be effectively improved.
Description
Technical field
The present invention relates to dual mode communication technology, particularly the dual mode communication technology of a kind of OFDM power line communication and GFSK radio communication
Background technology
Power information collection mainly adopts traditional Single mode communication mode, and mainstream technology mainly contains power line communication and micro power radio communication.
Power line communication utilizes low-voltage power line power distribution network to carry out carrier communication, with low cost, one of major way becoming intelligent meter data recording.In power line carrier communication, in order to obtain higher speed and the interference of anti-arrowband, adopt orthogonal frequency division multiplexi (OFDM).OFDM is divided into several parallel data streams information, then Data Modulation is transmitted to mutually orthogonal single sub-carrier.OFDM reduces intersymbol interference, improves the availability of frequency spectrum, has effectively resisted arrowband interference.
But power line has a lot of non-ideal factor as communication media: time variation is strong, equiva lent impedance transformation range is large, and fading channel is large, interference and noise strong etc.Along with the continuous increase of power consumption equipment kind, various frequency conversion electrical equipment and high-power electric appliance use more and more, and OFDM carrier communication in some conditions cannot proper communication, especially heavy or under disturbing strong condition in load.
Micro power radio communication adopts wireless channel as communication media, it is not by the impact of the various non-ideal factors of power line, in various load heavy and under disturbing strong environment communication efficiency fine, but wireless channel is in iron sheet table case and the many place of some building walls, cannot proper communication.
Adopt the dual mode communication mode of power line carrier and micro power radio communication, when power line interference is very strong or load weighs especially, power line cannot communicate, now adopt wireless communication, and serious at wireless shielding, when radio communication cannot normally work, power line is adopted to communicate, power line communication because channel is different, has very strong complementarity with radio communication in the application, and therefore dual mode communication mode can both be stablized under various conditions and communicate reliably.
Summary of the invention
The object of the invention is to provide a kind of dual-mode communication chip based on OFDM power line communication and wireless GFSK.Have employed the OFDM modulation technology of applicable power line communication and the GFSK modulation technique of applicable radio meter register simultaneously, chip integration is high, single-chip can realize the power line communication adopting OFDM modulation mode, the radio communication adopting GFSK debud mode can be realized again, reduce system complexity, effectively can improve the success rate of checking meter of power information acquisition system.
Technical scheme of the present invention is as follows:
The dual-mode communication chip of a kind of OFDM power line communication and GFSK radio communication, be integrated with bimodulus AFE (analog front end) receiving circuit, bimodulus modulator-demodulator, bimodulus carrier sense collision detection CSMA unit, sigma delta modulator, phase locked-loop unit and Power Amplifier Unit.
Described bimodulus AFE (analog front end) receiving circuit comprises frequency conversion and amplifying unit, filter unit and analog to digital converter, can carry out frequency translation, amplification, filtering and analog-to-digital conversion to ofdm signal GFSK signal.
Described bimodulus modulator-demodulator comprises OFDM modulation demodulating unit and GFSK modulator-demodulator.
Described sigma delta modulator can be configured to GFSK pattern and be used for sending GFSK signal, also can be configured to OFDM pattern and be used for sending ofdm signal.
Described phase-locked loop can be configured to GFSK pattern and be used for sending GFSK signal, also can configure OFDM pattern and be used for sending ofdm signal.
Described bimodulus carrier sense collision detection CSMA unit carries out intelligent collision detection according to OFDM detection signal and GFSK detection signal.
Beneficial effect of the present invention
As can be seen from technique scheme, the present invention has following beneficial effect:
The invention discloses a kind of OFDM power line communication and wireless GFSK dual-mode communication chip, single-chip integration bimodulus AFE (analog front end) receiving circuit, bimodulus modulator-demodulator, bimodulus carrier sense collision detection CSMA unit, configurable sigma delta modulator, configurable phase locked-loop unit, configurable power amplifier unit.Chip integration is high, and single-chip both can realize the power line communication adopting OFDM modulation mode, can realize again the radio communication adopting GFSK debud mode, reduce system complexity, effectively can improve the success rate of checking meter of power information acquisition system.
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described.
Fig. 1 is system block diagram of the invention process
Fig. 2 is the block diagram of bimodulus analog front circuit of the invention process
Fig. 3 is the block diagram of the invention process OFDM modulation demodulator
Fig. 4 is the block diagram of GFSK modulator-demodulator of the invention process
Fig. 5 is the block diagram of bimodulus CSMA of the invention process
Specific implementation method
Circuit block diagram of the invention process is as Fig. 1.Shown frequency conversion and amplifying unit 101, filter unit 102, analog to digital converter 103, OFDM modulation demodulation 104, GFSK modulator-demodulator 105, CRC check and FEC forward error correction 106, store and interface unit 107, sigma delta modulator 108, phase locked-loop unit 109, Power Amplifier Unit 110, bimodulus carrier sense collision detection CSMA unit 111.Shown frequency conversion and amplifying unit export 101 and are connected with filter unit 102, filter unit 102 exports and analog to digital converter 103, analog to digital converter 103 exports and is connected with GFSK modulator-demodulator 105 with OFDM modulation demodulation 104, OFDM modulation demodulation 104 is connected with FEC forward error correction 106 with CRC check with GFSK modulator-demodulator 105, CRC check is connected with interface unit 107 with storage with FEC forward error correction 106, and OFDM modulation demodulation 104 is connected with sigma delta modulator 108 with GFSK modulator-demodulator 105; Sigma delta modulator 108 is connected with phase locked-loop unit 109; Phase locked-loop unit 109 exports and is connected with Power Amplifier Unit 110.
As Fig. 2 provides the structured flowchart of bimodulus AFE (analog front end).Shown low noise amplifier unit 101, mixer unit 102, phase locked-loop unit 103, automatic gain amplifying unit 104, energy detection unit 105, variable band-pass filter 106, variable gain amplifier 107, AD conversion unit 108, energy detection unit 109, gain control unit 110.Low noise amplifier exports 101 and is connected with frequency mixer 102, the output of phase-locked loop 103 is connected with the input of frequency mixer 102, the output of frequency mixer 102 is connected with the input of automatic gain amplifier 104, and the output of automatic gain amplifier 104 is connected with the input of energy detection unit 105 and variable band-pass filter unit 106 respectively; The output of energy detection unit 105 is connected with the control end of automatic gain control unit 104; The output of variable band-pass filter unit 106 is connected with the input of adjustable gain amplifying unit 107; The output of adjustable gain amplifying unit 107 connects the second energy detection unit 110 respectively and is connected with the input of AD conversion unit 108; Second energy detection unit 110 is connected with gain control unit 108, and the output of gain control unit 108 is connected with the gain control end of adjustable gain amplifying unit 107.As Fig. 3 gives the block diagram of OFDM modulation demodulation.Be divided into transtation mission circuit and receiving circuit, first transtation mission circuit carries out chnnel coding to data, and the data after coding, through outer intertexture computing, add the randomness of data, has upset the original order of data, has improve antijamming capability; Then carry out convolutional encoding and interior intertexture, improve the reliability of data communication.Scrambler computing improves the randomness of data, reduces peak-to-average force ratio.Modulation module can realize Data Modulation according to configuration, by the data allocations after modulation on different subcarriers, then change to time domain through inversefouriertransform data from frequency domain, add Cyclic Prefix, the Frame that composition sends, by delivering to analog circuit after band pass filter.Receiving course is the inverse operation sent, except balanced and synchronous, and other computing all fours.
As Fig. 4 gives the block diagram of GFSK modulation /demodulation.Be divided into transtation mission circuit and receiving circuit, first transtation mission circuit carries out chnnel coding to data, improves antijamming capability, then forms the Frame of transmission, by delivering to sigma delta modulator after Gaussian filter, then sends through analog circuit.Receiving course is first computing after filtering, and then calculus of differences and down-sampled laggard line slip window judgement, carry out the accuracy of bit synchronization and the judgement of frequency offset correction raising sliding window simultaneously, then carry out data syn-chronization by frame head, decode data convert in judgement.
If Fig. 5 is bimodulus carrier sense conflict monitoring state machine diagram.Enter idle condition after system reset, if ofdm signal or GFSK signal detected, show to receive and busy enter accepting state, send order if receive during no signal, then the state to be sent such as to enter, if there is no above-mentioned two conditions, be then in idle condition always.Enter after finishing receiving and get back to idle condition.During etc. state to be sent, if ofdm signal or GFSK signal carrier detected, show to receive and busy enter accepting state, if no signal, after wait one section of random time, enter transmission state, after sending an OFDM carrier signal and a GFSK wireless signal, get back to idle condition.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art can also find out many selections, combination, modifications and changes on basis described above.Therefore, the scope of the present invention, should listed by claims.
Claims (4)
1. the dual-mode communication chip of an OFDM power line communication and GFSK radio communication, it is characterized in that: be integrated with bimodulus AFE (analog front end) receiving circuit, bimodulus modulator-demodulator, say mould carrier sense collision detection CSMA unit, sigma delta modulator, phase locked-loop unit and Power Amplifier Unit.
2. bimodulus AFE (analog front end) receiving circuit as claimed in claim 1, it is characterized in that: described bimodulus AFE (analog front end) receiving circuit comprises frequency conversion and amplifying unit, filter unit and analog to digital converter, can carry out frequency translation, amplification, filtering and analog-to-digital conversion to ofdm signal GFSK signal.
3. bimodulus modulator-demodulator as claimed in claim 1, is characterized in that: described bimodulus modulator-demodulator comprises OFDM modulation demodulating unit and GFSK modulator-demodulator.
4. bimodulus carrier sense collision detection CSMA unit as claimed in claim 1, is characterized in that: described bimodulus carrier sense collision detection CSMA unit carries out intelligent collision detection according to OFDM detection signal and GFSK detection signal.
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| CN201510013398.7A CN104539317A (en) | 2015-02-09 | 2015-02-09 | Dual-mode communication chip of OFDM carrier wave mode and GFSK wireless mode |
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| CN201510013398.7A CN104539317A (en) | 2015-02-09 | 2015-02-09 | Dual-mode communication chip of OFDM carrier wave mode and GFSK wireless mode |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108234378A (en) * | 2018-01-19 | 2018-06-29 | 张涛 | A kind of anti-aliasing filter method, apparatus and programmable logic device |
| CN109379101A (en) * | 2018-11-22 | 2019-02-22 | 天津七六四通信导航技术有限公司 | There are many hybrid communication devices in channel for miniature band |
| CN112398508A (en) * | 2020-11-03 | 2021-02-23 | 国网山东省电力公司青岛供电公司 | Intelligent module implementation method capable of realizing single-core double-channel based on HPLC communication |
| CN115001626A (en) * | 2022-05-26 | 2022-09-02 | 内蒙古显鸿科技股份有限公司 | Data modulation and demodulation method, system and medium |
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| JP2002374190A (en) * | 2001-06-15 | 2002-12-26 | Matsushita Electric Ind Co Ltd | Device and system for electric power line communication |
| CN103281279A (en) * | 2013-05-15 | 2013-09-04 | 北京华强智连微电子有限责任公司 | Realization method of electric power line carrier chip |
| CN203504599U (en) * | 2013-09-04 | 2014-03-26 | 国家电网公司 | Electric power communication device based on OFDM technology |
| CN204697106U (en) * | 2015-01-21 | 2015-10-07 | 北京华强智连微电子有限责任公司 | A kind of OFDM power line carrier and GFSK wireless double mode communication chip |
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2015
- 2015-02-09 CN CN201510013398.7A patent/CN104539317A/en active Pending
Patent Citations (4)
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| JP2002374190A (en) * | 2001-06-15 | 2002-12-26 | Matsushita Electric Ind Co Ltd | Device and system for electric power line communication |
| CN103281279A (en) * | 2013-05-15 | 2013-09-04 | 北京华强智连微电子有限责任公司 | Realization method of electric power line carrier chip |
| CN203504599U (en) * | 2013-09-04 | 2014-03-26 | 国家电网公司 | Electric power communication device based on OFDM technology |
| CN204697106U (en) * | 2015-01-21 | 2015-10-07 | 北京华强智连微电子有限责任公司 | A kind of OFDM power line carrier and GFSK wireless double mode communication chip |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108234378A (en) * | 2018-01-19 | 2018-06-29 | 张涛 | A kind of anti-aliasing filter method, apparatus and programmable logic device |
| CN109379101A (en) * | 2018-11-22 | 2019-02-22 | 天津七六四通信导航技术有限公司 | There are many hybrid communication devices in channel for miniature band |
| CN112398508A (en) * | 2020-11-03 | 2021-02-23 | 国网山东省电力公司青岛供电公司 | Intelligent module implementation method capable of realizing single-core double-channel based on HPLC communication |
| CN112398508B (en) * | 2020-11-03 | 2022-02-22 | 国网山东省电力公司青岛供电公司 | Intelligent module implementation method capable of realizing single-core double-channel based on HPLC communication |
| CN115001626A (en) * | 2022-05-26 | 2022-09-02 | 内蒙古显鸿科技股份有限公司 | Data modulation and demodulation method, system and medium |
| CN115001626B (en) * | 2022-05-26 | 2023-08-08 | 内蒙古显鸿科技股份有限公司 | Data modulation and demodulation method, system and medium |
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