CN107612858A - Multicarrier base band and FSK hybrid modulation methods based on inductively thermohaline depth chain - Google Patents
Multicarrier base band and FSK hybrid modulation methods based on inductively thermohaline depth chain Download PDFInfo
- Publication number
- CN107612858A CN107612858A CN201710969906.8A CN201710969906A CN107612858A CN 107612858 A CN107612858 A CN 107612858A CN 201710969906 A CN201710969906 A CN 201710969906A CN 107612858 A CN107612858 A CN 107612858A
- Authority
- CN
- China
- Prior art keywords
- frequency
- data
- fsk
- wave
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
- Near-Field Transmission Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The present invention is using the transmission channel of inductively thermohaline depth chain as using prototype, propose a kind of multicarrier base band being applied in overocean communications system and FSK hybrid modulation methods, and it is directed to the communication protocol design of the invention reception demodulation part of corresponding time-domain filtering, complete transmitting-receiving overocean communications system is constituted with this, the feasibility of the modulator approach is verified using matlab, and actual test has been carried out using LABVIEW softwares, actual ocean coupling channel and matlab demodulation process algorithm.The lowest signal-to-noise that can be born in theory tested by the channel system of software test and reality is 10db, the bit error rate is controlled within 2/1000ths, well below current channel communication environment, the it is proposed of this method provides a kind of data communications method of simple possible for inductively thermohaline depth transmission channel, the realization of this method can simplify the complexity of underwater data node circuit, and a kind of new thinking is provided to reduce the power consumption of communication system and extending system lifetim.
Description
Technical field
The present invention is using the transmission channel of inductively thermohaline depth chain as using prototype, it is proposed that one kind is applied to overocean communications
Multicarrier base band and FSK hybrid modulation methods in system, provide one kind for inductively thermohaline depth transmission channel and simply may be used
Capable data communications method, the realization of this method can simplify the complexity of underwater data node circuit, to reduce communication system
Power consumption and extension system lifetim provide a kind of new thinking.
Background technology
Data transmission technology based on inductively channel is one of important communication technology of Ocean Surveying, is using electricity
The contactless underwater signal transmission channel system that magnetic induction principle is realized, it has, and transmission means is simple in construction, cost is low, transmission
Apart from it is remote the characteristics of, while sensor node can be subjected to three-dimensional networking, realize more preferable marine monitoring effect.Inductively
Oceanographic data communication system is mainly made up of underwater data node, data transmission channel and reception modulating system three parts waterborne,
Wherein underwater data node is sent modulating system and formed by sensor, data；Transmission channel is by coupling magnet ring (including magnet ring waterborne
With underwater magnet ring), transmission cable and water body composition.In the actual measurement work in inductively ocean, the biography in underwater data node
Sensor completes the collection to information such as the ocean temperatures, salinity, depth of different nodes, and data are sent into modulation system by data
System is modulated a group bag and passes to underwater magnet ring, is then transferred to magnet ring waterborne again by being inductively transferred to single-turn circular coil, most
After be transferred to reception modulating system waterborne and be demodulated processing, because underwater node long-term work is in marine environment, simply may be used
For reducing the power consumption of system, the working life for extending system has great importance the modulation technique leaned on.
The transmission means of data signal is divided into base band transmission and band-pass transmissions, and digital baseband signal refers to not carrier-modulated
And digital baseband signal is directly transmitted, the communication technology has the advantages of simple possible.Frequency shift keying (FSK) utilizes the frequency of carrier wave
Rate changes to transmit digital information, and it has the advantages that realizing simply, the better performances of antinoise and antidamping, in middle low speed number
According to being widely used in transmission.At present, the inductively Transmission system that China is researched and developed is with marine environment, iron oxygen
The magnet ring of body material, the modeling Baogang cable of high intensity are transmission channel, using ASK or DPSK modulation-demodulation technique, realize data
The transmission of information, its transmission rate reach 1200bps.Compared to China, transmission system of the other countries based on inductively principle
System has possessed polytype ripe product.At this stage, grasp inductively transmission technology and apply to marine monitoring
The main You Liangge companies of system, it is the SBE-BIRD in the U.S. and Canadian RBR companies respectively.The sensing of SBE-BIRD companies
The equipment such as coupled transmission system and current meter, Doppler profile instrument has standard serial interface, can collect with remote measurement inductive transmission systems
Into together, using DPSK modulation techniques, its transmission rate is up to 9.6Kbps.The inductively data transmission system of RBR companies
Be by inductively transmitter and underwater instrument integrate under water, it is reachable using DPSK modulation techniques, its transmission rate
4.8Kbps.This method uses base band and FSK Hybrid Modulation Technologies, has more preferable anti-interference energy compared to ASK modulation techniques
Power, compared to DPSK technologies, its structure is simpler.
The content of the invention
The purpose of the present invention is to have devised multicarrier base band by the further investigation to baseband modulation and FSK modulation technology
With the signal modulating method of FSK hybrid modulations, with improve the overocean communications system data based on inductively thermohaline depth chain biography
Defeated speed, the power consumption of communication system benthic division node is reduced, extend the usage time of electricity, that improves whole system uses the longevity
Life, to obtain bigger marine monitoring ability.
The present invention has carried out deep theory analysis according to baseband modulation technique and FSK modulation technology, and according to sensing coupling
The actual features of thermohaline depth chain and the power consumption demand of overocean communications system are closed, have devised the tune that multicarrier base band mixes with FSK
Method processed, concrete regulation are：Modulation whole first uses base band square-wave frequency modulation, carrier wave is not added with, with the whole modulating part of simplification
Circuit structure；Secondly, whole signal square wave is made up of multi-frequency, and the square wave of first frequency forms leading for a whole set of transmission signal
Ripple, periodicity are fixed；The different types of parameter that different frequency below represents respectively, the periodicity of every kind of square wave represent respectively
The numerical value of the parameter；Finally, guided wave and other specification waveform are formed into a signal bag, group bag is sent.The effect of guided wave be for
Receiving portion provides identification, synchronous effect, only successfully identifies guided wave come numerical value below can just be had with receiving portion
The reception of effect, while guided wave has the function to underwater node circuit frequency calibration waterborne.Number of parameters below is according to itself
System needs to be configured, and the present invention has three kinds of temperature, salinity, depth signals, therefore this hair based on inductively thermohaline depth chain
The bright square wave for being provided with three kinds of different frequencies below, the square wave of each frequency represent a kind of parameter, and the periodicity of square wave is should
The transmission numerical values recited of parameter.
The present invention is the overocean communications system based on inductively thermohaline depth chain, and combines baseband modulation and FSK modulation
Advantage and caused multicarrier base band and FSK hybrid modulation methods, and have devised on this basis based on time domain filtering
Reception demodulating system constitute complete set overocean communications receive-transmit system.Use first and emulation survey has been carried out on MATLAB softwares
Examination, demonstrate the feasibility of hybrid modulation method.Also with LABVIEW softwares, actual coupling channel to whole overocean communications
Receive-transmit system carries out actual laboratory level test, to verify the service condition in actual environment.The invention is oceanographic data
Transmission research provides a new method, and has important reality to improving overocean communications system transfer rate and reducing power consumption
Border meaning, and solution is provided to complicated ocean communication monitoring system.
Technical scheme：
The transmission channel based on inductively thermohaline depth chain of the invention, with reference to the respective advantage of baseband modulation and FSK modulation, hair
Understand multicarrier base band and FSK hybrid modulation methods, and be directed to connecing for corresponding time-domain filtering of the communication protocol design of invention
Demodulation part is received, complete transmitting-receiving overocean communications system is constituted with this, the feasibility of the modulator approach entered using matlab
Go checking, and couple channel using LABVIEW softwares, actual ocean and matlab demodulation process algorithm has carried out reality
Test.It can be expressed as, transmission program and NI USB- are modulated using LABVIEW software programming design data modulation algorithms program
The collection of 6259 data collecting cards receives the modulated data that channel is coupled by ocean, and then the data received are saved,
And send data by receiving demodulating algorithm programe reduction.
Multicarrier base band provided by the invention based on inductively thermohaline depth chain and FSK hybrid modulation methods, specific step
Suddenly it is：
1st step, design send modulating part
The channel characteristic of inductively thermohaline depth chain overocean communications system is primarily based on, design multicarrier base band is mixed with FSK
Modulator approach is closed, base band square-wave frequency modulation is carried out, is added without carrier wave；Square wave frequency part uses similar FSK frequency variation pattern,
And the signal only transmits four kinds of temperature, salinity, depth parameters, therefore channel is transmitted serially to using by four kinds of different frequencies
In, first frequency band is guided wave, and periodicity is fixed, and the effect of guided wave is to play guiding, recognition reaction；Three frequency difference afterwards
For the temperature in ocean, salinity, the parameter of depth, periodicity size represents parameter value；Four frequencies be one group of data together
Send.
2nd step, design receive demodulating system
By modulated signal respectively by the wave filter of four kinds of different frequency parameters, the baseband signal of each frequency is extracted, so
The signal waveform filtered out respectively to wave filter afterwards carries out being shaped to square wave, and is counted using rising edge, saves；If
The periodicity of first frequency is that saves the data received below as the periodicity of the first frequency waveform of transmission；
If different, data below are abandoned；
3rd step, the test of communication modulation demodulating system plus noise
By data Transmission system and data receiving system synthesis at one piece, complete transceiver communication system is formed, is utilized
MATLAB carries out test emulation, and white Gaussian noise is added to it, 3 kinds of temperature of input, salt, deep data volume, is modulated by modulating system
Go out corresponding frequency and periodicity, the signal to noise ratio of initialization system, reception is demodulated by demodulating system, demodulates the correspondence of transmission
Parameter values.Test result shows that the multicarrier base band based on inductively thermohaline depth chain has with FSK hybrid modulation methods
Feasibility, it is possible to achieve overocean communications systemic-function, the very low bit error rate can be ensured in the case of very low signal to noise ratio.
4th step, add actual sensed coupling channel progress confirmatory experiment
Modulating system, i.e. input temp, salinity, the numerical value of three kinds of parameters of depth are sent using LABVIEW Software for Design, is adjusted
The square-wave signal that four kinds of guided wave, temperature, salinity, depth different frequencies combine is made, and adds white Gaussian noise to simulate
Actual environment, the signal of mixed noise is sent to actual overocean communications inductively among channel, and utilizes NI USB-
6259 data collecting cards by the signal of channel to being acquired.The data signal received is carried out by reception system program
Demodulation process, obtain the concrete numerical value of three parameters.From experimental result, the multicarrier base based on inductively thermohaline depth chain
Band uses in can coupling channel in the ocean of reality with FSK hybrid modulation methods, has certain use value, this result
It is consistent with the simulation results to system, it was demonstrated that the accuracy of emulation testing.
The advantages of the present invention：
The present invention is directed to the high request of inductively thermohaline depth chain and overocean communications system to power consumption, it is proposed that overloading
Ripple base band and FSK hybrid modulation methods, this method compared with other data communications methods for, drawn baseband modulation and FSK modulation
The advantage of mode, using base band square-wave frequency modulation, the characteristics of change along with FSK frequency, implement simpler, Er Qiekao
Consider the practical factor encountered in various overocean communications, more meet the demand of the actual overocean communications system of reality.It is more
Baseband is sent with FSK hybrid modulation methods using base band square wave, and without other carrier modulations, which greatly simplifies hair
The hardware circuit of part is sent, the power consumption of sending module is also therefore greatly reduced, increases the usage time of battery, substantially prolongs
Data transmission system sending node life cycle.In addition multi-frequency combined square wave is used using the frequency change similar to FSK, can
, can be with simultaneous transmission temperature, salt, deep three kinds of data to substantially increase volume of transmitted data, or monitoring system is carried out as needed
Extension, increase the quantity of parameter value, can very easily improve the complexity of whole communication system.Demodulation part, using parallel
Data processing, four wave filters are placed parallel, data are filtered respectively, extract the fundamental wave of data waveform, then carry out whole
Shape counts, and this method is highly suitable for conventional fpga parallel advantage, can so greatly speed up the processing speed of data, carry
The disposal ability of high whole communication system, the power consumption of whole system is reduced, improve the service life of whole communication system.
Brief description of the drawings
Fig. 1 is the overocean communications master-plan of the multicarrier base band based on inductively thermohaline depth chain and FSK hybrid modulations
Figure, mainly includes：(a) flux ring portion waterborne, (b) transmission wirerope, (c) underwater magnet ring, (d) modulating part, (e) demodulation part；
Fig. 2 is algorithm implementation process figure, and figure (a) is modulating part and its specific agreement, and figure (b) is demodulation part and its knot
Structure, figure (c) is time domain filtering；
Fig. 3 is each node waveform reduction of overocean communications system, and figure (a) is the original square wave sent out, (b) plus noise
Square wave, (c) after filtering after square wave, the square wave of (d) after shaping；
Fig. 4 is error rate calculation figure, and figure (a) is the graph of a relation of the bit error rate and signal to noise ratio, and figure (b) is the bit error rate with sending frequency
The graph of a relation of rate；
It is described further below in conjunction with accompanying drawing and by embodiment to the embodiment of the present invention.
Embodiment
Embodiment one
The first step：Design sends modulating part
Lead code selects 30KHZ square wave first, and periodicity is arranged to 5000；Temperature information uses 100KHZ square wave,
Periodicity is arranged to 8000,；Salinity information uses 50KHZ square wave, and periodicity is arranged to 10000；Depth information uses 80KHZ
Square wave, periodicity is arranged to 12000.Group bag is sent in a serial manner, first sends lead code, secondly temperature information, then
Secondary salinity information, the order of last depth information, these four frequencies are fixed, the square wave group signal that periodicity determines is sent out
Go.
Second step：Design receives demodulating system
Demodulating system is made up of four kinds of bandpass filters, reshaper and counter.Filter order is 100 ranks, is used respectively
In the signal for filtering out 30KHz, 100KHz, 50KHz, 80KHz.Because the signal of device after filtering is sinusoidal, therefore use one
It is shaped to square wave by reshaper.The principle of reshaper is, if the magnitude of voltage of input signal is more than a certain threshold value, output signal
For height, if being equal to or less than the threshold value, output signal is low.In principle, the threshold value is a magnitude of voltage more than zero, therefore most
Output duty cycle square wave afterwards is less than 50%.A rolling counters forward rising edge number is finally used, can be to reach technical side
The purpose of ripple number, so as to obtain the information contained in signal.
3rd step：Communication modulation demodulating system plus noise is tested
As what the first step was described designs transmission modulating part, guided wave frequency is 30khz, the cycle 5000；Temperature frequency
Rate is 100KHz, periodicity 8000；Salinity frequency is 50KHz, periodicity 10000；Deep frequency is 80KHz, and periodicity is
12000；The signal Serial output that will be modulated, white Gaussian noise is added, setting signal to noise ratio is 8db, is formed by noise jamming
Output signal, and the signal is input in the reception demodulating system as described in second, demodulates corresponding parameter values,
And the numerical value to demodulating calculates corresponding error code compared with the numerical value sent.By emulation testing, demonstrate based on sense
The multicarrier base band of thermohaline depth chain and the feasibility of FSK hybrid modulation methods should be coupled.
4th step：Add actual sensed coupling channel and carry out confirmatory experiment
Using LABVIEW Software for Design transmitting portions, input temp, salinity, depth parameter value, and then modulate guided wave
30KHz square wave, periodicity are arranged to 5000；Temperature parameter uses square wave of the frequency for 100KHz, and periodicity is arranged to
8000,；Salinity parameter uses square wave of the frequency for 50KHz, and periodicity is arranged to 10000；Depth parameter uses frequency as 80KHz
Square wave, periodicity is arranged to 12000.The square wave of four kinds of frequencies is converted digital signals into simulation electricity by analog-digital converter
Signal, it is input in inductively channel, and using NI USB-6259 data collecting cards to being adopted by the signal of channel
Collection.Reception system program of the data signal received by the narration of the 3rd step is demodulated processing, obtains the tool of three parameters
Body numerical value, and obtained numerical value is calculated into the bit error rate compared with sending numerical value.The verification experimental verification is based on inductively
The multicarrier base band of thermohaline depth chain and the feasibility of FSK hybrid modulation methods in practice, and compared with emulation testing, this
One result is consistent with the simulation results to system, it was demonstrated that the accuracy of emulation testing.
Simulation and analysis result
(1) as can be seen from Figure, multicarrier base band and FSK hybrid modulation method knots based on inductively thermohaline depth chain
The advantages of having closed baseband modulation and FSK modulation, use baseband modulation, with reference to the different frequency in FSK modulation, every kind of frequency representative
A kind of parameter value, periodicity parameter value.Modulation carrier wave is added without, only carries out baseband modulation, simplifies the electricity for sending modulation
Road, the power consumption for sending modulation circuit is reduced, extends usage time；Using multiple frequency carriers, many kinds of parameters number can be sent
According to improving data transfer.
(2) as can be seen from Figure, the trend gradually increased can occur with the reduction of signal to noise ratio in the bit error rate of signal,
Otiose signal can be flooded when the noise of signal is too big, causes signal interference and useful signal can not be extract, is
The bit error rate is in the scope 2/1000ths, in theory signal to noise ratio minimum 4db, in actual test signal to noise ratio on
Rise, reach 8db.
It can also be drawn the following conclusions by this experiment：Multicarrier base band can simplify electricity with FSK hybrid modulation methods
Road, power consumption is reduced, and the Transmission system disposably organizes bag and sends temperature, salt, deep more data parameters, and transmission contains much information, and
The parameter that can be sent according to actual use situation increase, increases the parameter amount of transmission, expands monitoring range, can so extend
The service life of whole system, feasible scheme is provided to build complicated marine monitoring system.
Claims (5)
1. the multicarrier base band provided by the invention based on inductively thermohaline depth chain and FSK hybrid modulation methods, specific steps
It is：
1st step, design send modulating part
The channel characteristic of inductively thermohaline depth chain overocean communications system is primarily based on, design multicarrier base band mixes tune with FSK
Method processed, base band square-wave frequency modulation is carried out, is added without carrier wave；Square wave frequency part uses FSK frequency variation pattern, and the letter
Three kinds of transmission temperature, salinity, depth parameters are also needed in number in addition to pilot tone, therefore are used the serial data of four kinds of different frequencies
It is sent in channel, first frequency band is guided wave, and periodicity is fixed, and the effect of guided wave is to play guiding, identification and frequency school
Accurate effect；Three frequencies are respectively temperature, salinity, the parameter of depth in ocean afterwards, the size of periodicity represent temperature,
The parameter value of salinity, depth；Four frequencies are that one group of data is sent together.
2nd step, design receive demodulating system
By modulated channel respectively by the wave filter of four kinds of different frequency parameters, the baseband signal of each frequency, Ran Houfen are extracted
The other signal waveform filtered out to wave filter carries out being shaped to square wave, and is counted using rising edge, saves；If first frequency
The periodicity of rate is that saves the data received below as the periodicity of the first frequency waveform of transmission；If
It is different, abandon data below；
3rd step, the test of communication modulation demodulating system plus noise
By data Transmission system and data receiving system synthesis at one piece, complete transceiver communication system is formed, utilizes MATLAB
Test emulation is carried out, white Gaussian noise is added to it, 3 kinds of temperature of input, salt, deep data volume, is modulated accordingly by modulating system
Frequency and periodicity, the signal to noise ratio of initialization system, reception is demodulated by demodulating system, demodulates the corresponding parameter of transmission
Numerical value.
4th step, add actual sensed coupling channel progress confirmatory experiment
Modulating system, i.e. input temp, salinity, the numerical value of three kinds of parameters of depth are sent using LABVIEW Software for Design, is modulated
The square-wave signal that four kinds of guided wave, temperature, salinity, depth different frequencies combine, and white Gaussian noise is added to simulate reality
Environment, the signal of mixed noise is sent to actual overocean communications inductively among channel, and utilizes NI USB-6259
Data collecting card by the signal of channel to being acquired.The data signal received is demodulated place by reception system program
Reason, obtains the concrete numerical value of three parameters.
2. transmitting portion modulator approach according to claim 1, it is characterised in that multicarrier base band and FSK hybrid modulations
Method modulated signal, using base band square-wave frequency modulation, without carrier modulation, and the multi-frequency hybrid modulation of FSK modes is used,
A kind of every kind of parameter value of frequency representative, the numerical values recited of the periodicity representation parameter of every kind of frequency.
3. analysis method according to claim 1, it is characterised in that this modulator approach send agreement be guided wave, parameter 1,
Parameter 2, parameter 3 combine serial transmission, and guided wave frequency and periodicity are fixed, entirely send data front portion, behind connect parameter,
Every kind of parameters frequency is different, number of parameters number can arbitrary extension according to demand.
4. analysis method according to claim 1, it is characterised in that the anterior addition guided wave of data division is entirely being sent,
It is to provide identification, synchronous effect for receiving portion that it, which is acted on, only successfully identifies guided wave come number below with receiving portion
Value just can be received effectively, while guided wave has the function to underwater node circuit frequency calibration waterborne.
5. analysis method according to claim 1, it is characterised in that multicarrier base band and FSK hybrid modulation methods are bases
Invented in inductively channel thermohaline depth chain, the parameter spread suitable for such overocean communications system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710969906.8A CN107612858B (en) | 2017-10-17 | 2017-10-17 | Multi-carrier baseband and FSK hybrid modulation method based on inductive coupling temperature and salt deep chain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710969906.8A CN107612858B (en) | 2017-10-17 | 2017-10-17 | Multi-carrier baseband and FSK hybrid modulation method based on inductive coupling temperature and salt deep chain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107612858A true CN107612858A (en) | 2018-01-19 |
| CN107612858B CN107612858B (en) | 2020-11-06 |
Family
ID=61077082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710969906.8A Expired - Fee Related CN107612858B (en) | 2017-10-17 | 2017-10-17 | Multi-carrier baseband and FSK hybrid modulation method based on inductive coupling temperature and salt deep chain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107612858B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832823A (en) * | 2009-03-13 | 2010-09-15 | 国民技术股份有限公司 | Temperature sensor |
| CN104821851A (en) * | 2015-05-19 | 2015-08-05 | 华南师范大学 | 2ASK preprocessing visible light communication system |
| CN105052103A (en) * | 2013-02-07 | 2015-11-11 | 西门子公司 | Method for the synchronous transmission of messages |
| US20170124960A1 (en) * | 2015-10-29 | 2017-05-04 | Lg Display Co., Ltd. | Power control device and method and organic light emitting display device including the same |
| WO2017099191A1 (en) * | 2015-12-10 | 2017-06-15 | 株式会社デンソー | Signal transfer circuit |
| CN107070570A (en) * | 2017-03-28 | 2017-08-18 | 天津工业大学 | Inductively overocean communications system channel characteristic research and analysis based on frequency sweep method |
-
2017
- 2017-10-17 CN CN201710969906.8A patent/CN107612858B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832823A (en) * | 2009-03-13 | 2010-09-15 | 国民技术股份有限公司 | Temperature sensor |
| CN105052103A (en) * | 2013-02-07 | 2015-11-11 | 西门子公司 | Method for the synchronous transmission of messages |
| CN104821851A (en) * | 2015-05-19 | 2015-08-05 | 华南师范大学 | 2ASK preprocessing visible light communication system |
| US20170124960A1 (en) * | 2015-10-29 | 2017-05-04 | Lg Display Co., Ltd. | Power control device and method and organic light emitting display device including the same |
| WO2017099191A1 (en) * | 2015-12-10 | 2017-06-15 | 株式会社デンソー | Signal transfer circuit |
| CN107070570A (en) * | 2017-03-28 | 2017-08-18 | 天津工业大学 | Inductively overocean communications system channel characteristic research and analysis based on frequency sweep method |
Non-Patent Citations (4)
| Title |
|---|
| D.KRULIC: "Multiple square wave voltammetry: experimental verification of the theory", 《MULTIPLE SQUARE WAVE VOLTAMMETRY: EXPERIMENTAL VERIFICATION OF THE THEORY 》 * |
| 潘子龙: "两节反谐振式网络输出方波脉冲的参数计算", 《强激光与粒子束》 * |
| 王琦峰: "多载波信号非合作接收参数估计关键技术研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 邓云: "感应耦合数据传输技术及其在海洋领域的应用研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107612858B (en) | 2020-11-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206133913U (en) | Be used for smart power grids data acquisition system | |
| CN102710281B (en) | Direct sequence spread spectrum method for continuous phase modulation | |
| CN102612817B (en) | Apparatus and method for transmitting data in low-frequency band in human body communication system | |
| CN107070570A (en) | Inductively overocean communications system channel characteristic research and analysis based on frequency sweep method | |
| CN107819713A (en) | Multi-channel parallel processing frequency-domain demodulation method based on inductively thermohaline depth chain | |
| CN101714961B (en) | Digital signal transmitting method and equipment based on modulated carriers of equal amplitude and equal period | |
| CN103457636A (en) | Method and system for cross-frequency band power line carrier communication based on frequency recognition technology | |
| CN101605112A (en) | A kind of ultra wide band chaotic communication method | |
| JP2005354682A (en) | Uwb communication method, uwb transmission device, and reception device | |
| CN103152074B (en) | A kind of direct sequence spread spectrum communication system launching and receiving method | |
| CN103700240A (en) | Hydrographic measuring information wireless transmission system applicable to turbid shallow water and hydrographic measuring information wireless transmission method applicable to turbid shallow water | |
| CN103023533B (en) | Communication method and communication device for dual-frequency power line carrier | |
| CN105978595B (en) | Multimode reception device, multimode sending device and multimode receiving/transmission method | |
| CN101217333B (en) | A transmission method and the corresponding acceptance method of channel resource reusing | |
| US20220385376A1 (en) | Ultrasonic Human Body Communication Method Based on a Group Index Modulation, and a Device Thereof | |
| CN102325109B (en) | Rapid FSK (Frequency Shift Keying) demodulation method and full-digital low-power-consumption device for realizing same | |
| CN107579940A (en) | Multi-carrier communication algorithm based on inductively thermohaline depth chain multinode channel model | |
| CN103580723B (en) | A kind of UWB Wireless Sensor device communication means based on time-frequency combination modulation | |
| CN107612858A (en) | Multicarrier base band and FSK hybrid modulation methods based on inductively thermohaline depth chain | |
| CN103152070B (en) | Variable beacon sequence-based spread spectrum communication method | |
| CN101582868A (en) | Extended binary phase shift keying modulation and demodulation method for frequency spectrum compression | |
| CN104992549B (en) | A kind of Intelligent Drill String duplex information Transmission system and method based on adsl communication | |
| CN101945474A (en) | RSSI-based positioning method for wireless sensor network | |
| CN105846927A (en) | Deep-sea navigation XCTD time-varying channel signal transmission error rate analysis method under ASK frequency band transmission | |
| CN103138776B (en) | A kind of Zigbee emitter of multi output |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Zhang Sai Document name: Notice of termination of patent right |
|
| DD01 | Delivery of document by public notice | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201106 Termination date: 20211017 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |