CN107241153A - The impedance calculation device and computational methods of a kind of body area network channel - Google Patents
The impedance calculation device and computational methods of a kind of body area network channel Download PDFInfo
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- CN107241153A CN107241153A CN201710600762.9A CN201710600762A CN107241153A CN 107241153 A CN107241153 A CN 107241153A CN 201710600762 A CN201710600762 A CN 201710600762A CN 107241153 A CN107241153 A CN 107241153A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/005—Transmission systems in which the medium consists of the human body
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
Abstract
In view of the shortcomings of the prior art, the present invention provides a kind of impedance calculation device and computational methods, the impedance calculation device, including computer, detection unit, theoretical model unit, Model Measured unit, fitting unit of body area network channel；The computational methods, including：Obtain detection signal, the acquisition of theoretical model, the acquisition of Model Measured, 4 steps of fitting for setting up complete trails model.Beneficial technique effect：The present invention by the way of emulation, the segmented model that above 2 steps are obtained is together in series to form complete trails model, both improves simulation accuracy, model complexity is reduced again on whole communication path.The invention provides the detection means suitable for the above method.
Description
Technical field
The invention belongs to wireless communication technology field, and in particular to a kind of impedance calculation device of body area network channel and calculating
Method.
Background technology
With sensor network and the development and progress of radio communication, wearable or implanted sensor node is more next
More popularize so that wireless body area network (WBAN.Wireless Body Area Network) it is widely used in tele-medicine
The field such as health care and special population nursing, wireless body area network is radio sensing network (WSN, Wireless Sensor
Network) one of branch.IEEE has set up IEEE802.15.6 work group in 2007, and issues IEEE in 2012
802.15.6 standard, has greatly promoted the development of wireless body area network.Network of the wireless body area network centered on body, includes body
Implantable sensor inside the wearable sensor on surface or implantation body, and some possible equipment (such as mobile phone or
Computer etc.).
Wireless body area network is also the important component of Internet of Things IoT (Internet of Thing) medical service system：
By the various sensor nodes in body surface or body, the physiological data observed and collect body includes body temperature, blood pressure, the heart
Rate etc., then these physiological datas are sent on the various communication equipments of the related personnel such as doctor, care provider, realize to body domain
The real-time analysis of network users physiological parameter and feedback, and then preferably monitoring patient, the elderly or other special populations, urgent feelings
Condition can directly send ambulance.
In transmission signal process, signal energy constantly can be lost for transmission channel, influence the factor master of loss of signal
There are resistance loss, dielectric loss, radiation loss etc..Therefore design of the impedance during transmission of wireless signals to communication system
Influence is very big.If too high to impedance estimation in design, design degree of desire is reserved excessive, system power dissipation can be caused excessive, shortened
The cruising time of portable electronic piece equipment.And if channel impedance is underestimated, then impedance can be caused more than expected, signal attenuation
Greatly, thrashing is directly resulted in.
Existing modeling technique includes：Simulation model, experimental model.During long-term use, there is following lack
Point：
Pure simulation model uses pure theoretical model, by way of finite element modeling, is assigned on virtual grid
Physiological parameter, then infers signal impedance using Computer Simulation.The shortcoming of this mode is：The accuracy of one physiological parameter
It is difficult to ensure that, we can not possibly detect to each cell of body.The second is electrode is difficult with being modeled on body contact surface.
Experimental model is by surveying the impedance obtained under specified path and scene.It has the disadvantage：Experiment condition is without normal plane face
All arrive, because impedance is with different people, different parts, different paths etc. there are different manifestations, therefore experimental model is eternal
Rich and varied application scenarios can not be met.
The content of the invention
For the above-mentioned deficiency of prior art, the present invention provides the impedance calculation device and computational methods of body area network channel,
To solve：
Compound modeling pattern is employed, experimental model is employed in electrode incoming end, improves model accuracy.For body
The different parts of body, employ corresponding measured data, and fitting obtains model parameter.
On whole communication path, by the way of emulation, the segmented model that above 2 steps are obtained is together in series, and it is complete to be formed
Path model, both improves simulation accuracy, model complexity is reduced again.
Detection means suitable for the above method is provided.
Concrete structure of the present invention is as follows：
A kind of impedance calculation device of body area network channel, including computer, provided with detection unit, theoretical model unit, reality
Survey model unit, fitting unit.Specifically annexation is：Detection unit is connected with computer, installs reasonable in computer
By model unit, Model Measured unit, fitting unit.
A kind of computational methods of the impedance calculation device of body area network channel, it is characterised in that carry out as follows：
Step 1：Obtain detection signal.
Signal will be detected after overcoupling/conduction to electrode, final by amplification module, sampling module, filtration module
To clearly detecting signal.
Step 2：The acquisition of theoretical model.
Using the method for finite element modelling, by computer is hindered by building the electrical property model of idiosoma organization come simulated channel
It is anti-.
Step 3：The acquisition of Model Measured.
Impedance calculation device of the present invention is worn on the diverse location of body and the data at each position are obtained, by counting
Calculation machine carries out the modeling of body various pieces respectively, obtains the Prediction Parameters of channel quality.
Step 4：Set up the fitting of complete trails model.
After being completed based on the modeling of body various pieces, carried out with reference to the Prediction Parameters and detection signal of channel quality
Fitting, and thus obtain the impedance of whole channel, that is, after the obtaining step for completing Model Measured, the step of real-time output result.
Wherein, the detection signal that obtains refers to the bio-electrical information of organism, bio-electrical information include internal signal and/
Or external signal.
The theoretical model refers to the model obtained using finite element etc. according to mathematical derivation.
The Model Measured refers to empirical model, wherein with or without empirical value, the Model Measured in the present invention
Empirical model including body part and the complete trails model being made up of multiple body sections.
The complete trails model refers to the impedance model of a complete channel.
Beneficial technique effect
The inventive method improves the model accuracy of electrode contact surface.
The method tested respectively with experiment can obtain more accurately body section model parameter.
On whole communication path, by the way of emulation, the segmented model that above 2 steps are obtained is together in series, and it is complete to be formed
Path model, both improves simulation accuracy, model complexity is reduced again.
The invention provides the equipment that one is used in the above method.
Brief description of the drawings
Fig. 1 is to implement schematic diagram using the typical case of the inventive method.
Embodiment
Describe the design feature and ins and outs of the present invention in detail in conjunction with accompanying drawing.
A kind of impedance calculation device of body area network channel, including computer, it is characterised in that provided with detection unit, theory
Model unit, Model Measured unit, fitting unit.Specifically annexation is：Detection unit is connected with computer, in computer
Theoretical model unit, Model Measured unit, fitting unit are inside installed.
Furtherly, detection unit includes biopotential electrode and biological electricity amplification module.Wherein, biopotential electrode is brain electricity
Electrode, electromyographic electrode, and/or electrocardioelectrode.
Furtherly, detection unit is made up of biopotential electrode, biological electricity amplification module, sampling module and filtration module.
Wherein, biopotential electrode is made up of electrode for encephalograms, electromyographic electrode and electrocardioelectrode.Electrode for encephalograms, electromyographic electrode and electrocardioelectrode
It is connected respectively through a biological electricity amplification module with sampling module.The output end of sampling module and the input phase of filtration module
Connection.
Using a kind of computational methods of the impedance calculation device of body area network channel of the present invention, enter as follows
OK：
Step 1：Obtain detection signal.
Signal will be detected after overcoupling/conduction to electrode, final by amplification module, sampling module, filtration module
To clearly detecting signal.
Step 2：The acquisition of theoretical model.
Using the method for finite element modelling, by computer is hindered by building the electrical property model of idiosoma organization come simulated channel
It is anti-.
Step 3：The acquisition of Model Measured.
Impedance calculation device of the present invention is worn on the diverse location of body and the data at each position are obtained, by counting
Calculation machine carries out the modeling of body various pieces respectively, obtains the Prediction Parameters of channel quality.
Step 4：Set up the fitting of complete trails model.
After being completed based on the modeling of body various pieces, carried out with reference to the Prediction Parameters and detection signal of channel quality
Fitting, and thus obtain the impedance of whole channel, that is, after the obtaining step for completing Model Measured, the step of real-time output result.
Wherein, the detection signal that obtains refers to the bio-electrical information of organism, bio-electrical information include internal signal and/
Or external signal.
The theoretical model refers to the model obtained using finite element etc. according to mathematical derivation.
The Model Measured refers to empirical model, wherein with or without empirical value, the Model Measured in the present invention includes
The empirical model of body part and the complete trails model being made up of multiple body sections.
The complete trails model refers to the impedance model of a complete channel.
Furtherly, in step 1, it is necessary to which the signal obtained is：Brain electricity electric signal, myoelectricity electric signal and electrocardio telecommunications
Number.Theoretical model is the electric finite element impedance model of brain, myoelectricity finite element impedance model and electrocardio finite element impedance model.
Furtherly, in step 1, the triggering submodule of detection is included.The triggering submodule of detection is touched by 2 factors
Hair：Passive triggering and actively triggering.Passive triggering is the clocked flip caused by time factor.Actively triggering is non-time factor
Caused clocked flip.
Furtherly, passively trigger to prevent system sleep.Actively triggering is that user's posture change is caused, it is necessary to weight
The new triggering for calculating channel impedance.I.e. actively triggering is because being triggered caused by system other factors.
Furtherly, in step 3, Model Measured Z (s) is specially：
Model Measured Z (s) is used for building the impedance model of body joint, body section and electrode contact surface, and D and E are real number
Parameter, s is Laplce's modulus, and Pn is limit n, and Res is that real number or plural number are right.Furtherly, Model Measured Z (s) structure
Construction method is to get the impedance of body joint, body section and electrode contact surface using the method for actual measurement first, then utilize number
The occurrence of above-mentioned parameter is obtained according to the method for fitting.
Then, the model of whole communication path is built by functional expression PL (d),
PL (d)=PL0+10nlog10 (d/d0) (formula 2)
The model is used for building the model of whole communication path.D is communication path length, and d0 is the length in nominal communication path
Degree, PL0 is the impedance value in nominal communication path, PL0=Z (s).
Furtherly, in the obtaining step of Model Measured carried out in system set-up stage.Impedance calculation device is worn
The diverse location of person's body to be detected is worn over, detection signal is obtained and is transmitted to computer disposal：Obtain detected person body each
Partial modeling：
It is by the mode of microcomputer modelling：
System is based on after detection signal is gotIt is fitted, so as to obtain
Get the concrete numerical value of coefficient in the formula.Then the prediction of the concrete numerical value of acquisition as channel quality in follow-up time is joined
Number.
Embodiment 1
It is a kind of typical performance of the present invention referring to Fig. 1.The implication of sequence number in figure is referring to following table：
The formula used in this embodiment for：
Model above is used for building the impedance model of body joint, body section, and electrode contact surface, and D and E join for real number
Number, s is Laplce's modulus, and Pn is limit n, and Res is that real number or plural number are right.Construction method is, first using the side of actual measurement
Method gets the impedance of body joint, body section, and electrode contact surface, and the method being then fitted using data obtains above-mentioned parameter
Occurrence.
PL (d)=PL0+10nlog10(d/d0) (2)
Model above is used for building the model of whole communication path.D is communication path length, and d0 is nominal communication path
Length, PL0 is the impedance value in nominal communication path.
Claims (9)
1. a kind of impedance calculation device of body area network channel, including computer, it is characterised in that provided with detection unit, theoretical mould
Type unit, Model Measured unit, fitting unit；Specifically annexation is：Detection unit is connected with computer, in computer
Theoretical model unit, Model Measured unit, fitting unit are installed.
2. the impedance calculation device of a kind of body area network channel according to claim 1, it is characterised in that detection unit includes
Biopotential electrode and biological electricity amplification module；Wherein, biopotential electrode is electrode for encephalograms, electromyographic electrode, and/or electrocardioelectrode.
3. the impedance calculation device of a kind of body area network channel according to claim 1, it is characterised in that detection unit is by giving birth to
Thing electricity electrode, biological electricity amplification module, sampling module and filtration module composition；Wherein, biopotential electrode is by electrode for encephalograms, myoelectricity
Electrode and electrocardioelectrode composition；Electrode for encephalograms, electromyographic electrode and electrocardioelectrode are respectively through a biological electricity amplification module and sampling
Module is connected；The output end of sampling module is connected with the input of filtration module.
4. the computational methods of the impedance calculation device using a kind of body area network channel described in claim 1, it is characterised in that press
Following steps are carried out：
Step 1：Obtain detection signal；
It will detect that signal after overcoupling/conduction to electrode, finally gives clearly by amplification module, sampling module, filtration module
Clear detection signal；
Step 2：The acquisition of theoretical model；
Using the method for finite element modelling, by computer is by building the electrical property model of idiosoma organization come simulated channel impedance；
Step 3：The acquisition of Model Measured；
Impedance calculation device of the present invention is worn on the diverse location of body and the data at each position are obtained, by computer
The modeling of body various pieces is carried out respectively, obtains the Prediction Parameters of channel quality；
Step 4：Set up the fitting of complete trails model；
After being completed based on the modeling of body various pieces, intended with reference to the Prediction Parameters and detection signal of channel quality
Close, and thus obtain the impedance of whole channel, that is, after the obtaining step for completing Model Measured, the step of real-time output result；
Wherein, described to obtain the bio-electrical information that detection signal refers to organism, bio-electrical information includes internal signal and/or body
External signal；
The theoretical model refers to the model obtained using finite element etc. according to mathematical derivation；
The Model Measured refers to empirical model, wherein with or without empirical value, the Model Measured in the present invention includes part
The empirical model of body and the complete trails model being made up of multiple body sections；
The complete trails model refers to the impedance model of a complete channel.
5. according to claim 4 use a kind of computational methods of the impedance calculation device of body area network channel, its feature exists
In in step 1, it is necessary to which the signal obtained is：Brain electricity electric signal, myoelectricity electric signal and electrocardio electric signal；Theoretical model is brain
Electric finite element impedance model, myoelectricity finite element impedance model and electrocardio finite element impedance model.
6. according to claim 4 use a kind of computational methods of the impedance calculation device of body area network channel, its feature exists
In in step 1, including the triggering submodule of detection；The triggering submodule of detection is triggered by 2 factors：Passive triggering and
Actively trigger；Passive triggering is the clocked flip caused by time factor；Actively triggering is that the caused timing of non-time factor is touched
Hair.
7. according to claim 6 use a kind of computational methods of the impedance calculation device of body area network channel, its feature exists
In passively triggering to prevent system sleep；Actively triggering is that user's posture change is caused, it is necessary to recalculate channel impedance
Triggering；I.e. actively triggering is because being triggered caused by system other factors.
8. according to claim 4 use a kind of computational methods of the impedance calculation device of body area network channel, its feature exists
In,
In step 3, Model Measured Z (s) is specially：
Model Measured Z (s) is used for building the impedance model of body joint, body section and electrode contact surface, and D and E are real parameters,
S is Laplce's modulus, and Pn is limit n, and Res is that real number or plural number are right；
Then, the model of whole communication path is built by functional expression PL (d),
PL (d)=PL0+10nlog10 (d/d0) (formula 2)
The model is used for building the model of whole communication path；D is communication path length, and d0 is the length in nominal communication path,
PL0 is the impedance value in nominal communication path, PL0=Z (s).
9. according to claim 4 use a kind of computational methods of the impedance calculation device of body area network channel, its feature exists
In, the obtaining step of Model Measured be system set-up stage carry out；Impedance calculation device is worn on person's body to be detected
The diverse location of body, obtains detection signal and is transmitted to computer disposal：Obtain the modeling of detected person's body various pieces：
It is specially by the mode of microcomputer modelling：System is based on after detection signal is got
It is fitted, so as to get the concrete numerical value of coefficient in the formula；Then it regard the concrete numerical value of acquisition as letter in follow-up time
The Prediction Parameters of road quality.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112932476A (en) * | 2019-11-26 | 2021-06-11 | Oppo广东移动通信有限公司 | Information prompting method and related equipment |
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| CN103345551A (en) * | 2013-06-28 | 2013-10-09 | 国家电网公司 | Method for calculating tower electric potential in back flashover based on vector matching method |
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