CN109547059A - A kind of Chirp-GFSK joint spread-spectrum modulation and demodulation system - Google Patents
A kind of Chirp-GFSK joint spread-spectrum modulation and demodulation system Download PDFInfo
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- CN109547059A CN109547059A CN201910092948.7A CN201910092948A CN109547059A CN 109547059 A CN109547059 A CN 109547059A CN 201910092948 A CN201910092948 A CN 201910092948A CN 109547059 A CN109547059 A CN 109547059A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention discloses a kind of Chirp-GFSK to combine spread-spectrum modulation and demodulation system, is related to wireless communication technology field.System includes radio frequency part, baseband modulator and base band demodulator；Baseband modulator includes data modulator, frame synchronization header generator and data frame comprising modules；Data modulator includes whitening module, spread spectrum module and GFSK modulation module.In transmitting terminal, system is according to GFSK spread spectrum mode dynamic generation and sends Chirp waveform as frame synchronizing signal, is then modulated by GFSK and sends data；In receiving end, symbol and frequency departure according to frame synchronizing signal Chirp using multi-threshold synchronized algorithm estimation signal during transmission, after the frequency departure of compensation spread spectrum GFSK, GFSK demodulation is carried out to spread spectrum GFSK signal and signal is de-spread, recovers transmission signal.The present invention combines Chirp modulated signal and spreads the advantage of GFSK modulated signal, reduces the synchronous complexity of signal, reduces the synchronization time to weak signal, overcome channel symbol frequency departure, signal demodulated complex degree is reduced while realizing low-power consumption.
Description
Technical field
The present invention relates to wireless communication technology fields more particularly to a kind of Chirp-GFSK to combine spread-spectrum modulation and demodulation system
System.
Background technique
Current wireless communication is all developed rapidly all over the world, and has become global communication and IT circles are paid close attention to jointly
Hot technology, especially as the world's Internet of Things construction it is fully under way, not only make wireless communication basic technology constantly improve
Development and change, more promote various types of wireless communication system and wirelessly communicate new technology to continue to bring out, market for
The demand of wireless communication technique also increases rapidly therewith.Remote transmission, low complex degree, low-power consumption are produced as new era Internet of Things
Demand of the industry for wireless communication chips.The physical layer design of bluetooth BLE technology uses GFSK signal modulation, successfully reduces and sets
The complexity of meter realizes the low-power consumption of communication chip, but transmission range is only limitted to several meters to tens meters.And direct sequence expands
Frequency technology is known and can achieve very high coding gain level, as, using Direct-Spread mode, realized in GPS system
Good noise resisting ability realizes remote signal transmission.But the design of GPS receiver is considerably complicated, and to weak signal
Synchronization time is very long.And the digit synthesis linear frequency modulation symbol that LoRa transceiver uses makees the communication system modulated, and also reaches
Very high coding gain is horizontal, show it is brilliant it is remote it is anti-make vulnerability to jamming, but using Fu of complexity in LoRa transceiver
In leaf transformation algorithm realize that signal receives demodulation and considerably increases the complexity of reception system.
Therefore, those skilled in the art is dedicated to developing a kind of Chirp-GFSK joint spread-spectrum modulation and demodulation system, with
Phase reduces the synchronous complexity of signal, reduces to weak signal synchronization time, and it is multiple that signal demodulation is reduced while realizing low-power consumption
Miscellaneous degree, and make it suitable for the demand of Internet of Things medium and long distance transmission.
Summary of the invention
In view of the above drawbacks of the prior art, the technical problems to be solved by the invention include two aspects: first is that how
The synchronous complexity of signal is reduced, to reduce to weak signal synchronization time；Second is that how to reduce letter while realizing low-power consumption
Number demodulated complex degree, to be suitable for the demand of Internet of Things medium and long distance transmission.
To achieve the above object, the present invention provides a kind of Chirp-GFSK to combine spread-spectrum modulation and demodulation system, including penetrates
Frequency part, baseband modulator and base band demodulator；The radio frequency part include first filter, DAC module, power amplifier,
Low-noise amplifier, second filter and ADC module；The baseband modulator includes data modulator, frame synchronization header generator
With data frame comprising modules；The data modulator includes whitening module, spread spectrum module and GFSK modulation module；The frame synchronization
Header generator includes spread spectrum parameter configuration module and Chirp generation module；The base band demodulator includes that digital filter, frame are same
It walks module, frequency deviation cancellation module, GFSK demodulation module, despreading frequency module and conciliates whitening module；
The frame synchronization header generator determines Chirp according to the spread spectrum mode configured in the spread spectrum parameter configuration module
The length that signal generates, and the Chirp signal is generated via the Chirp generation module；Originally transmitted signal is entered institute
Data modulator is stated, and carries out whitening processing via the whitening module, the data after whitening processing are admitted to the spread spectrum mould
Block carries out Direct Sequence Spread Spectrum processing, and the data after spread processing are modulated to obtain GFSK tune via the GFSK modulation module
Data processed；The data frame comprising modules by the Chirp signal of generation and the GFSK modulation data group be combined into one it is complete
Whole data packet；The data packet is via the first filter and the DAC module by the inphase signal component I of baseband signal
It is sent to the radio frequency part with quadrature signal component Q data, uppermixing is filtered by radio circuit, then by the power
Amplifier sends modulated radiofrequency signal；
The modulated radiofrequency signal is believed via the number generated after the second filter and ADC module processing
The digital filter for number being entered the base band demodulator carries out digital filtering, and the signal after digital filtering is admitted to described
Frame synchronization module carries out that signal is synchronous, determine the GFSK modulation data initial position and the frequency departure, by described
After frequency cancellation module eliminates frequency departure, then via GFSK demodulation module progress GFSK demodulation, despread via described
Module carries out direct sequence and despreads, and the data after despreading, which input after the solution whitening module carries out solution whitening processing, to be restored
The transmission signal out.
Further, the Chirp signal includes Down-Chirp (frequency linearity successively decreases) signal and Up-Chirp (frequency
Linear increment) signal.
Further, Down-Chirp (frequency linearity successively decreases) signal and the Up-Chirp (frequency linearity is incremented by)
The signal length parameter of signal determines that GFSK spreads parameter according to configuration variation, according to the spread spectrum parameter configuration module, according to
Down-Chirp and Up-Chirp signal length parameter required for the GFSK spread spectrum parameter determines.
Further, the Chirp signal generation module first generates the Up-Chirp signal and accords with to signal is received
Number synchronization regenerates the Down-Chirp signal and carries out frequency offset estimation to the reception signal.
Further, the originally transmitted signal include device address (Device Addr), header packet information (Header),
Bag data (Payload) and verification section (CRC).
Further, the concrete operations of the Direct Sequence Spread Spectrum processing are by pseudo-random generator in the spread spectrum module
Output valve and the whitening processing after data carry out exclusive or processing.
Further, it is to be estimated using multi-threshold synchronized algorithm that the frame synchronization module, which carries out the synchronous specific method of signal,
Symbol and frequency deviation f of the signal during transmission are counted, to realize sign synchronization and frequency offset estimation.
Further, the calculation formula of the frequency offset estimation is,
Frequency deviation f=(Posi2-Posi1-Lchirp)/2*BW/Lchirp,
Wherein, Posi2 is the Up-Chirp signal end position, and Posi1 is the Down-Chirp signal stop bits
It sets, Lchirp is the Chirp signal length parameter, and BW is the bandwidth of the originally transmitted signal.
Further, the frequency deviation cancellation module includes frequency mixer, and eliminates frequency departure using the frequency mixer.
Further, the concrete operations that the direct sequence is despread are, by the pseudo-random sequence locally generated and reception
The cumulative judgement later of the sequence exclusive or arrived sends size of data.
Compared with prior art, the beneficial technical effect of the present invention lies in:
The present invention combines Chirp modulated signal and spreads the advantage of GFSK modulated signal, devises a kind of joint Chirp
With the spread-spectrum modulation and demodulation wireless communication system of GFSK.Using Chirp signal as frame synchronizing signal, reduction signal is synchronous to be answered
Miscellaneous degree reduces to weak signal synchronization time, overcomes channel symbol frequency departure.Using GFSK spread spectrum, low-power consumption is being realized
While reduce signal demodulated complex degree, suitable for Internet of Things medium and long distance transmission demand.
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
Detailed description of the invention
Fig. 1 is that the system of a preferred embodiment of the invention constitutes schematic diagram；
Fig. 2 is the instantaneous frequency of Up-Chirp signal and Down-Chirp signal in a preferred embodiment of the invention；
Fig. 3 is spread spectrum module operation principle schematic diagram in a preferred embodiment of the invention；
Fig. 4 is the complete data packet frame structure diagram in a preferred embodiment of the invention；
Fig. 5 is that Chirp signal synchronizes flow chart in a preferred embodiment of the invention；
Fig. 6 is despreading frequency module operation principle schematic diagram in a preferred embodiment of the invention.
Wherein, 1-radio frequency part, 2-baseband modulators, 3-base band demodulators, 101-first filters, 102-DAC
Module, 103-power amplifiers, 104-low-noise amplifiers, 105-second filters, 106-ADC module, 2-base band tune
Device processed, 21-data modulators, 22-frame synchronization header generators, 23-data frame comprising modules, 211-whitening modules, 212-
Spread spectrum module, 213-GFSK modulation modules, 221-spread spectrum parameter configuration modules, 222-Chirp generation modules, 301-numbers
Filter, 302-frame synchronization modules, 303-frequency deviation cancellation modules, 304-GFSK demodulation modules, 305-despreading frequency modules,
306-solution whitening modules.
Specific embodiment
Multiple preferred embodiments of the invention are introduced below with reference to Figure of description, keep its technology contents more clear and just
In understanding.The present invention can be emerged from by many various forms of embodiments, and protection scope of the present invention not only limits
The embodiment that Yu Wenzhong is mentioned.
As shown in Figure 1, the present invention provides a kind of Chirp-GFSK to combine spread-spectrum modulation and demodulation system, including radio frequency part
1, baseband modulator 2 and base band demodulator 3.Radio frequency part 1 includes first filter 101, DAC module 102, power amplifier
103, low-noise amplifier 104, second filter 105 and ADC module 106.Baseband modulator 2 includes data modulator 21, frame
Synchronous header generator 22 and data frame comprising modules 23.Data modulator 21 includes whitening module 211,212 and of spread spectrum module
GFSK modulation module 213.Frame synchronization header generator 22 includes spread spectrum parameter configuration module 221 and Chirp generation module 222.Base
Band demodulator 3 includes digital filter 301, frame synchronization module 302, frequency deviation cancellation module 303, GFSK demodulation module 304, despreading
Frequency module 305 conciliates whitening module 306.
In transmitting terminal, frame synchronization header generator 22 is determined according to the spread spectrum mode configured in spread spectrum parameter configuration module 221
Determine the length of Chirp signal generation, and generates Chirp signal via Chirp generation module 222.Chirp signal includes Down-
Chirp (frequency linearity successively decreases) signal and Up-Chirp (frequency linearity is incremented by) signal, this two segment signal are used for receiving end symbol
Synchronous and offset estimation.The instantaneous frequency of Down-Chirp and Up-Chirp, Chirp signal is as shown in Figure 2.When system works,
Chirp signal generation module 222 first generates Up-Chirp signal and carries out sign synchronization to signal is received, and regenerates Down-Chirp
Signal carries out frequency offset estimation to the reception signal.Wherein, Down-Chirp (frequency linearity successively decreases) signal and Up-
The signal length parameter of Chirp (frequency linearity is incremented by) signal is according to configuration variation, first according to spread spectrum parameter configuration module 221
It determines that GFSK spreads parameter, Down-Chirp and Up-Chirp signal length required for parameter determines then is spread according to GFSK
Parameter.
In transmitting terminal, originally transmitted signal includes device address (Device Addr), header packet information (Header), packet number
According to (Payload) and verification section (CRC).The originally transmitted signal is entered data modulator 21, and via whitening module 211
Whitening processing is carried out, the data after whitening processing are admitted to spread spectrum module 212 and carry out Direct Sequence Spread Spectrum processing, after spread processing
Data be modulated to obtain GFSK modulation data via GFSK modulation module 213.As shown in figure 3, Direct Sequence Spread Spectrum is handled
Concrete operations be that the data after the output valve of pseudo-random generator in spread spectrum module 212 and the whitening processing are subjected to exclusive or
Processing.
The Chirp signal of generation and GFSK modulation data group are combined into a complete data by data frame comprising modules 23
Packet, the frame structure of complete data packet such as Fig. 4.The data packet is via first filter 101 and DAC module 102 by baseband signal
Inphase signal component I and quadrature signal component Q data be sent to radio frequency part 1, uppermixing is filtered by radio circuit, so
Modulated radiofrequency signal is sent by power amplifier 103 afterwards.
In receiving end, modulated radiofrequency signal is via the number generated after second filter 105 and the processing of ADC module 106
The digital filter 301 that word signal is entered base band demodulator 3 carries out digital filtering.It is same that signal after digital filtering is admitted to frame
It is synchronous to walk the progress signal of module 302, determines initial position and the frequency departure of GFSK modulation data, then, signal is entered frequency
Rate cancellation module 303, frequency deviation cancellation module 303 include frequency mixer, eliminate frequency departure using the frequency mixer, it is inclined to eliminate frequency
After difference, then via the progress GFSK demodulation of GFSK demodulation module 304, direct sequence is carried out via despreading frequency module 305 and is despread, most
Data input solution whitening module 306 after despreading afterwards recovers originally transmitted signal after carrying out solution whitening processing.
In the treatment process of receiving end, frame synchronization module 302 carries out the synchronous specific method of signal and is, using multi-threshold
Synchronized algorithm estimates symbol and frequency deviation f of the signal during transmission, to realize sign synchronization and frequency departure
Estimation, concrete operations process are as shown in Figure 5.
As shown in figure 5, frame synchronization module 302 is according to the decision Chirp signal generation of the spread spectrum mode of current-configuration first
Length Lchirp, Up-Chirp signal is generated according to Chirp length parameter, by the Up-Chirp signal of generation and the data received
Related accumulated energies P1corr, while calculating the signal energy P1 for receiving datasig, according to reception signal energy P1sigDifference
Size selects corresponding energy threshold P1th, as related accumulated energies P1corrGreater than threshold value P1thWhen, correlation energy is at this time for definition
P1corr_1, continue searching the related accumulated energies P1 of N number of pointcorr_2To P1corr_N, multilevel iudge set [P1corr_1,
P1corr_2... ..., P1corr_N] in maximum value, the maximum value position be send signal Down-Chirp end position Posi1, this
It carves, generates the Down-Chirp signal of same length, start the position that search sends signal Up-Chirp.Similarly, it will generate
Up-Chirp signal accumulated energies P2 related to the data receivedcorr, while calculating the signal energy for receiving data
P2sig, according to reception signal energy P2sigDifferent size select corresponding energy threshold P2th, as related accumulated energies P2corr
Greater than threshold value P2thWhen, correlation energy is P2 at this time for definitioncorr_1, continue searching the related accumulated energies P2 of N number of pointcorr_2Extremely
P2corr_N, multilevel iudge set [P2corr_1, P2corr_2... ..., P2corr_N] in maximum value, the maximum value position be send signal
Up-Chirp end position Posi2.According to the position Down-Chirp Posi1, Up-Chirp the position Posi2 obtained before and
Chirp signal length parameter Lchirp, frequency deviation f, which can be calculated, is
Δ f=(Posi2-Posi1-Lchirp)/2*BW/Lchirp
Wherein, BW is the bandwidth for sending signal.
As shown in fig. 6, it is the puppet that will locally generate that despreading frequency module 305, which carries out the concrete operations that direct sequence is despread,
Random sequence sends size of data with the cumulative judgement later of the sequence exclusive or received.
The present invention combines Chirp modulated signal and spreads the advantage of GFSK modulated signal, passes through Chirp modulation system pole
The earth reduces the synchronous computation complexity of signal of spread spectrum GFSK, reduces to weak signal synchronization time, spreads by using GFSK
Technology reduces signal demodulated complex degree while realizing low-power consumption, simplifies the hardware costs of spread spectrum system chip realization,
It can satisfy the modulation /demodulation performance requirement of communication system.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of Chirp-GFSK combines spread-spectrum modulation and demodulation system, which is characterized in that including radio frequency part, baseband modulator and
Base band demodulator；The radio frequency part includes first filter, DAC module, power amplifier, low-noise amplifier, the second filter
Wave device and ADC module；The baseband modulator includes data modulator, frame synchronization header generator and data frame comprising modules；Institute
Stating data modulator includes whitening module, spread spectrum module and GFSK modulation module；The frame synchronization header generator includes spread spectrum ginseng
Number configuration module and Chirp generation module；The base band demodulator includes digital filter, frame synchronization module, frequency deviation elimination mould
Block, GFSK demodulation module, despreading frequency module conciliate whitening module；
The frame synchronization header generator determines Chirp signal according to the spread spectrum mode configured in the spread spectrum parameter configuration module
The length of generation, and the Chirp signal is generated via the Chirp generation module；Originally transmitted signal is entered the number
Carry out whitening processing according to modulator, and via the whitening module, the data after whitening processing be admitted to the spread spectrum module into
Row Direct Sequence Spread Spectrum is handled, and the data after spread processing are modulated to obtain GFSK modulation number via the GFSK modulation module
According to；The Chirp signal of generation and the GFSK modulation data group are combined into one completely by the data frame comprising modules
Data packet；The data packet is via the first filter and the DAC module by the inphase signal component I of baseband signal and just
It hands over signal component Q data to be sent to the radio frequency part, uppermixing is filtered by radio circuit, then by the power amplification
Device sends modulated radiofrequency signal；
The modulated radiofrequency signal is via the digital signal quilt generated after the second filter and ADC module processing
The digital filter for inputting the base band demodulator carries out digital filtering, and it is same that the signal after digital filtering is admitted to the frame
Walk module and carry out that signal is synchronous, determine the GFSK modulation data initial position and the frequency departure, by the frequency
After cancellation module eliminates frequency departure, then via GFSK demodulation module progress GFSK demodulation, via the despreading frequency module
It carries out direct sequence to despread, the data after despreading input after the solution whitening module carries out solution whitening processing and recover institute
State transmission signal.
2. Chirp-GFSK as described in claim 1 combines spread-spectrum modulation and demodulation system, which is characterized in that the Chirp letter
It number include Down-Chirp (frequency linearity successively decreases) signal and Up-Chirp (frequency linearity is incremented by) signal.
3. Chirp-GFSK as claimed in claim 2 combines spread-spectrum modulation and demodulation system, which is characterized in that the Down-
The signal length parameter of Chirp (frequency linearity successively decreases) signal and the Up-Chirp (frequency linearity is incremented by) signal is according to configuration
Variation determines that GFSK spreads parameter according to the spread spectrum parameter configuration module, required for being determined according to GFSK spread spectrum parameter
Down-Chirp and Up-Chirp signal length parameter.
4. Chirp-GFSK as described in claim 1 combines spread-spectrum modulation and demodulation system, which is characterized in that the Chirp letter
Number generation module first generates the Up-Chirp signal and carries out sign synchronization to signal is received, and regenerates the Down-Chirp letter
Number to the reception signal carry out frequency offset estimation.
5. Chirp-GFSK as described in claim 1 combines spread-spectrum modulation and demodulation system, which is characterized in that described originally transmitted
Signal includes device address (Device Addr), header packet information (Header), bag data (Payload) and verification section (CRC).
6. Chirp-GFSK as described in claim 1 combines spread-spectrum modulation and demodulation system, which is characterized in that the direct sequence
The concrete operations of spread processing are by the number after the output valve of pseudo-random generator in the spread spectrum module and the whitening processing
According to progress exclusive or processing.
7. Chirp-GFSK as described in claim 1 combines spread-spectrum modulation and demodulation system, which is characterized in that the frame synchronization mould
It is to estimate symbol of signal during transmission using multi-threshold synchronized algorithm that block, which carries out the synchronous specific method of signal,
Number and frequency deviation f, to realize sign synchronization and frequency offset estimation.
8. Chirp-GFSK as claimed in claim 7 combines spread-spectrum modulation and demodulation system, which is characterized in that the frequency departure
The calculation formula of estimation is,
Frequency deviation f=(Posi2-Posi1-Lchirp)/2*BW/Lchirp,
Wherein, Posi2 is the Up-Chirp signal end position, and Posi1 is the Down-Chirp signal end position,
Lchirp is the Chirp signal length parameter, and BW is the bandwidth of the originally transmitted signal.
9. Chirp-GFSK as described in claim 1 combines spread-spectrum modulation and demodulation system, which is characterized in that the frequency deviation is eliminated
Module includes frequency mixer, and eliminates frequency departure using the frequency mixer.
10. Chirp-GFSK as described in claim 1 combines spread-spectrum modulation and demodulation system, which is characterized in that the direct sequence
Arranging the concrete operations despread is, the pseudo-random sequence locally generated is sent with the cumulative judgement later of sequence exclusive or received
Size of data.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071732A (en) * | 2019-04-16 | 2019-07-30 | 苏州磐启微电子有限公司 | A kind of low-consumption wireless method of reseptance and its receive system |
| CN110572337A (en) * | 2019-09-12 | 2019-12-13 | 重庆邮电大学 | Channel estimation and equalization method for Chirp modulation signal |
| CN110581750A (en) * | 2019-11-11 | 2019-12-17 | 上海磐启微电子有限公司 | modulator, demodulator and wireless communication system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040100897A1 (en) * | 1998-02-12 | 2004-05-27 | Shattil Steve J. | Carrier interferometry coding with aplications to cellular and local area networks |
| CN1531295A (en) * | 2003-03-11 | 2004-09-22 | M/A-Com | Method and method for modulating bias linear modulation pulses |
| CN105374191A (en) * | 2015-11-24 | 2016-03-02 | 西安科技大学 | Modulator-demodulator used for elevator hoistway and short distance wireless communication method |
| CN106452501A (en) * | 2016-09-30 | 2017-02-22 | 华中科技大学 | Establishment method for real virtual staggered quadriphase sequence, MSK/GMSK (Gaussian Minimum Shift Keying) synchronization method and spectrum spread system |
| CN107426534A (en) * | 2017-05-25 | 2017-12-01 | 智恒科技股份有限公司 | Intelligent acquisition system and management system |
| CN107945487A (en) * | 2017-12-29 | 2018-04-20 | 洛阳愿景科技有限公司 | A kind of radio meter register equipment of M BUS power supplies |
-
2019
- 2019-01-30 CN CN201910092948.7A patent/CN109547059B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040100897A1 (en) * | 1998-02-12 | 2004-05-27 | Shattil Steve J. | Carrier interferometry coding with aplications to cellular and local area networks |
| CN1531295A (en) * | 2003-03-11 | 2004-09-22 | M/A-Com | Method and method for modulating bias linear modulation pulses |
| CN105374191A (en) * | 2015-11-24 | 2016-03-02 | 西安科技大学 | Modulator-demodulator used for elevator hoistway and short distance wireless communication method |
| CN106452501A (en) * | 2016-09-30 | 2017-02-22 | 华中科技大学 | Establishment method for real virtual staggered quadriphase sequence, MSK/GMSK (Gaussian Minimum Shift Keying) synchronization method and spectrum spread system |
| CN107426534A (en) * | 2017-05-25 | 2017-12-01 | 智恒科技股份有限公司 | Intelligent acquisition system and management system |
| CN107945487A (en) * | 2017-12-29 | 2018-04-20 | 洛阳愿景科技有限公司 | A kind of radio meter register equipment of M BUS power supplies |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071732A (en) * | 2019-04-16 | 2019-07-30 | 苏州磐启微电子有限公司 | A kind of low-consumption wireless method of reseptance and its receive system |
| CN110572337A (en) * | 2019-09-12 | 2019-12-13 | 重庆邮电大学 | Channel estimation and equalization method for Chirp modulation signal |
| CN110572337B (en) * | 2019-09-12 | 2021-11-05 | 重庆邮电大学 | Channel estimation and equalization method for Chirp modulation signal |
| CN110581750A (en) * | 2019-11-11 | 2019-12-17 | 上海磐启微电子有限公司 | modulator, demodulator and wireless communication system |
| CN111181600A (en) * | 2019-12-31 | 2020-05-19 | 北京升哲科技有限公司 | Chirp spread spectrum modulation and demodulation method and system based on QPSK |
| CN111181596B (en) * | 2019-12-31 | 2021-11-30 | 北京升哲科技有限公司 | Modulation-demodulation method and system |
| CN111181600B (en) * | 2019-12-31 | 2022-01-11 | 北京升哲科技有限公司 | Chirp spread spectrum modulation and demodulation method and system based on QPSK |
| CN111181596A (en) * | 2019-12-31 | 2020-05-19 | 北京升哲科技有限公司 | Modulation-demodulation method and system |
| CN111245475A (en) * | 2020-01-10 | 2020-06-05 | 上海感悟通信科技有限公司 | Wireless communication data transmitting method, receiving method, wireless communication method and device |
| CN112134820B (en) * | 2020-08-24 | 2022-01-14 | 北京智芯微电子科技有限公司 | Modulation method, modulator, demodulation method, demodulator, communication method and system |
| CN112134820A (en) * | 2020-08-24 | 2020-12-25 | 北京智芯微电子科技有限公司 | Modulation method, modulator, demodulation method, demodulator, communication method and system |
| CN112904386A (en) * | 2021-01-15 | 2021-06-04 | 武汉梦芯科技有限公司 | Method and system for compensating LoRa Doppler frequency offset based on GNSS |
| CN114665918A (en) * | 2022-03-25 | 2022-06-24 | 深圳市力合微电子股份有限公司 | Multi-slope Chirp signal generation and de-spreading method with error correction capability |
| CN114665918B (en) * | 2022-03-25 | 2023-10-27 | 深圳市力合微电子股份有限公司 | Multi-slope Chirp signal generation and despreading method with error correction capability |
| CN115174323A (en) * | 2022-06-29 | 2022-10-11 | 北京智芯微电子科技有限公司 | Frequency modulation signal detection method, device, electronic equipment and storage medium |
| CN115174323B (en) * | 2022-06-29 | 2023-11-28 | 北京智芯微电子科技有限公司 | Frequency modulation signal detection method, frequency modulation signal detection device, electronic equipment and storage medium |
| CN117375661A (en) * | 2023-12-05 | 2024-01-09 | 深圳市国电科技通信有限公司 | Signal processing method, system, electronic device and storage medium |
| CN117375661B (en) * | 2023-12-05 | 2024-02-09 | 深圳市国电科技通信有限公司 | Signal processing method, system, electronic device and storage medium |
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