CN105320823B - Information exchange modeling method and its device based on current coupling type IBC - Google Patents
Information exchange modeling method and its device based on current coupling type IBC Download PDFInfo
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Abstract
The invention belongs to human body communication technology field, and in particular to a kind of information exchange modeling method and its device based on current coupling type IBC.This method carries out circuit modeling first, to the information interaction passage based on current coupling type IBC, forms overall circuit model.Secondly, according to the overall circuit model proposed, circuit modeling is carried out to the contact impedance caused by extremity.Then, with reference to overall circuit model, the information exchange complete circuit model based on current coupling type IBC is formed.Finally, based on the complete circuit model established, the information exchange mathematical modeling based on current coupling type IBC is obtained through circuit analysis.Contrast prior art, the present invention provides safety guarantee for the information exchange based on current coupling type IBC, design for the information interactive device based on current coupling type IBC provides system design foundation, solve two Geometric Modeling, circuit modeling and the Mathematical Modeling Problems between organism and electronic installation, offered reference for correlative study with design.
Description
Technical field
The invention belongs to human body communication technology field, and in particular to a kind of information exchange based on current coupling type IBC is built
Mould method and its device.
Background technology
Human body communication (Intra-Body Communication, IBC) is a kind of number using human body as signal transmission medium
According to the communication technology, compared to current short-distance wireless communication technology (such as bluetooth, ZigBee), the technology have low-power consumption,
The advantages such as anti-interference, high-speed.Importantly, based on human body communication technology can realize people-people based on extremity, people-
Machine information is interactive and the networking of wearable electronic installation etc..Human body communication technology is in information exchange, personal area network, net
The fields such as network access, cloud computing, physiologic information monitoring system have a variety of potential applications.Such as：Two people need to only hold
Hand, you can electronic name card exchanging；Consumer only needs hand stretching to automatic vending machine, you can completes small amount payment；Visitor only needs
Stand before a certain showpiece, you can obtain electronic information of the showpiece etc. automatically by the human body communication apparatus positioned at foot.Therefore,
Human body communication has extensive in fields such as wired home, digitization community, medical information, E-Government, IT application in enterprises
Application prospect.
Mathematical modeling is particularly significant for realizing the information exchange based on human body communication (hereinafter referred to as IBC).On the one hand,
The Information Interaction Model based on human body communication is established, software simulation can be carried out to correlation technique and technology before Physical Experiment, from
And ensure personal safety.On the other hand, software emulation is carried out based on mathematical modeling, the people under different condition-people's information can be handed over
Many condition simulation is mutually carried out, and then obtains its channel characteristic, foundation is provided for the information interactive device design based on IBC.However,
The modeling difficulty of information exchange based on IBC is relatively large.First, compared with the human body communication based on single human body medium, it is based on
The information model of human body communication should not only include two manikins, should also include contact resistance caused by double body extremity
Anti- model etc., so as to increase the complexity of model.Secondly, the channel characteristic of the information exchange based on human body communication by it is multiple because
The influence of element, such as contact site, the way of contact and human body attitude, so as to increase determination, verify its calculation method of parameters
Difficulty.
For these reasons, existing research at present only realizes the human body communication modeling based on single human body medium, and not
The modeling of the information exchange based on human body communication can be realized.Due to lacking correlation model, method there is no clearly to lead to based on human body at present
The channel characteristic of the information exchange of letter, the design of related IBC devices equally lack foundation.
The content of the invention
The purpose of the present invention is to solve the information exchange modeling problem based on human contact, it is proposed that a kind of to be based on electric current
The modeling method of coupled mode IBC information exchange.
The inventive method principle is：First, circuit modeling is carried out to the information interaction passage based on current coupling type IBC,
Form overall circuit model.Secondly, according to the modeling method proposed, circuit is carried out to the contact impedance caused by extremity
Modeling.Then, with reference to overall circuit model, the information exchange complete circuit model based on current coupling type IBC is formed.Finally,
Based on the complete circuit model established, the information exchange mathematical modeling based on current coupling type IBC is obtained through circuit analysis.
The purpose of the present invention is achieved through the following technical solutions.
The modeling method of information exchange based on current coupling type IBC, including herein below：Foundation is based on current coupling type
The information exchange overall circuit model of human body communication, the model mainly include by the transmitting terminal for simulating human body communication transmitter
Model (1), for simulating the more human body medium's models (2) for two human bodies for carrying out information exchange and being connect for simulating human body communication
Receive the closed circuit of receiving terminal model (3) composition of device；
The transmitting terminal model (1) includes two transmitting terminals being connected respectively with human body communication transmitter model (11) both ends
Electrode-human contact's impedance (1)；Human body communication transmitter model includes voltage source and its internal resistance being sequentially connected；
More human body medium's models (2) include two sets of human body A being sequentially connected transverse impedance (22), human body-human body
The transverse impedance (24) of contact impedance (23) and human body B, and the two sets of impedances in this two sets of impedance both ends and this that are placed in are connected respectively
Input impedance (21) and output impedance (26), and two intersect impedance (25) with this two sets of impedance interconnections；
The receiving terminal model (3) includes two receiving terminals being connected respectively with human body communication receiver model (32) both ends
Electrode-human contact's impedance (31).
Preferably, the circuit model of the human body-human contact's impedance (23) is by latticed connection intersected with each other
Some human body A unit transverse impedance (231), some human body B unit transverse impedance (232) and with some unit longitudinal impedances
(233) the circuit network composition formed, the total impedance of circuit network is human body-human contact's impedance.
Preferably, parallel circuit meter of the unit transverse impedance by each layer counterpart impedance in tissue hierarchical structure
The equiva lent impedance calculated, the longitudinal impedance are the string of each layer counterpart impedance in the two human body organizational hierarchys to contact with each other
The equiva lent impedance that connection circuit counting goes out.
Preferably, the tissue hierarchical structure is skin, fat, muscle, five layers of cancellous bone and compact bone substance.
A kind of information exchange model building device based on current coupling type IBC, including be sequentially connected transmitting terminal model, contact
Dielectric model and receiving terminal model, three form a completion closed circuit；
The transmitting terminal model includes two transmitting termination electrode-people being connected respectively with human body communication transmitter model both ends
Body contact impedance；
More human body medium's models include two sets of human body A being sequentially connected transverse impedance, human body-human contact's impedance
With human body B transverse impedance, and the input impedance and output that the two sets of impedances in this two sets of impedance both ends and this are connected respectively that is placed in
Impedance, and two intersect impedance with this two sets of impedance interconnection；
The receiving terminal model includes two reception termination electrode-people being connected respectively with human body communication receiver model both ends
Body contact impedance.
Preferably, the human body-human contact's impedance is horizontal by some human body A of latticed connection intersected with each other unit
The circuit network formed to impedance, some human body B unit transverse impedance and some unit longitudinal impedances forms, circuit network
Total impedance is human body-human contact's impedance.
Preferably, parallel circuit meter of the unit transverse impedance by each layer counterpart impedance in tissue hierarchical structure
The equiva lent impedance calculated, the longitudinal impedance are the string of each layer counterpart impedance in the two human body organizational hierarchys to contact with each other
The equiva lent impedance that connection circuit counting goes out.
Preferably, the tissue hierarchical structure is skin, fat, muscle, five layers of cancellous bone and compact bone substance.
Beneficial effect
The present invention breaches the limitation that current human body communication model is only applicable to single human body medium's emulation, it is proposed that Yi Zhongji
In current coupling type IBC information exchange modeling method, the information exchange based on current coupling type IBC can be established based on this method
Mathematical modeling, so as to realize the information exchange mathematical simulation based on current coupling type IBC.Thus, will bring following beneficial to effect
Fruit：
(1) safety guarantee is provided：Based on the method for the present invention, the information exchange based on current coupling type IBC can be achieved
Mathematical simulation, avoid directly being tested with real human body, so as to ensure the safety of the information exchange related experiment based on IBC
Property.
(2) system design foundation is provided：The method according to the invention, the information based on current coupling type IBC can be established
Interaction models, by the channel characteristic of the mathematical simulation clearly information exchange based on human body communication, and then it is related IBC devices
Design provides foundation.
(3) offered reference for correlative study with design：The present invention proposes a kind of information exchange side based on human body communication
Method, it this method solve Geometric Modeling, circuit modeling sum between two organisms (palm), multiple human bodies and electronic installations
Modeling problem is learned, research and system design for association areas such as wearable electronic installation, personal area networks have important
Reference value.
Brief description of the drawings
Fig. 1 is information exchange overall circuit model schematic of the embodiment of the present invention based on current coupling type IBC；
Fig. 2 is the Geometric Modeling process schematic of extremity of the embodiment of the present invention (shaking hands), wherein (a) represents that human hand shows
It is intended to, (b) represents that human body-human contact (shakes hands) schematic diagram, and (c) represents that the geometrical model of human body-human contact (shaking hands) shows
It is intended to；
Fig. 3 is the circuit model schematic of extremity of the embodiment of the present invention (shaking hands)；
Fig. 4 is that extremity of the embodiment of the present invention (is shaken hands) the transverse impedance modeling process schematic diagram of model, wherein (a) table
Let others have a look at the geometrical model schematic diagram of body palm, (b) represents the human body palm geometrical model schematic diagram of unit length, and (c) represents single
The five-ply weave parallel circuit model schematic of bit length, (d) represent the geometrical model schematic diagram of unit longitudinal impedance；
Fig. 5 is that extremity of the embodiment of the present invention (is shaken hands) the longitudinal impedance modeling process schematic diagram of model, wherein (a) table
The geometrical model schematic diagram that body-human body of leting others have a look at is shaken hands, (b) represent the geometrical model signal that human body-human body of unit length is shaken hands
Figure, (c) represent the five-ply weave series circuit model schematic of unit length, and (d) represents the geometrical model of unit transverse impedance
Schematic diagram；
Fig. 6 positions model confirmatory experiment result of the embodiment of the present invention.
Reference：
1 is transmitting terminal model, including：11- human body communication transmitters model (voltage source and its internal resistance), 12- transmitting terminals electricity
Pole-human contact's impedance；
2 be more human body medium's models, including：21- input impedance, 22- human bodies A transverse impedance, 23- human bodies-human body connect
(shaking hands) impedance, 24- human bodies B transverse impedance are touched, 25- media intersect impedance, 26- output impedances；
3 be receiving terminal model, including：31- receives termination electrode-human contact's impedance, 32- human body communication receiver models；
231- human bodies A palm portion unit transverse impedance, 232- human bodies B palm portion unit transverse impedance, 233-
Human body A, human body B palm contacts part whole geometry model unit longitudinal impedance.
Embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
Embodiment
Illustrate the specific implementation of the information exchange modeling method of the invention based on current coupling type IBC exemplified by shaking hands below
Process：
Step 1, establish the information exchange overall circuit model based on current coupling type IBC；
In the information exchange based on current coupling type IBC, signal is coupled into by human body communication transmitter, emission electrode
Human body A, and via human body A, two hands, human body B in the state of shaking hands.Finally, led to by the receiving electrode at human body B ends, human body
Letter receiver detects the signal via human body transmission, and then realizes the information exchange based on extremity.According to above-mentioned signal
The process of transmission, establish the overall circuit model of the information exchange based on extremity.The model mainly includes：Transmitting terminal model
(human body communication transmitter model, launching termination electrode-human contact's impedance), more human body medium's model (input impedance, laterally resistances
It is anti-, intersect impedance, human body-human contact's impedance, output impedance), receiving terminal model (human body communication receiver model, receiving terminal
Electrode-human contact's impedance) etc..As shown in figure 1, including following content：
Transmitting terminal model 1, main analog human body communication transmitter, including：Human body communication transmitter model 11, including voltage
Source and its internal resistance, launch termination electrode-human contact's impedance 12；
More human body medium's models 2, main analog carries out two human bodies of information exchange, such as human body A and human body B, Yi Jiren
Body-human body contact portion；Because the present embodiment is exemplified by shaking hands, therefore contact portion is palm, including, it is double for simulating
The overall input impedance 21 of body medium channel, for simulating human body A transverse impedance 22, connect for simulating human body-human body palm
The impedance 23 of contact portion point, for simulating human body B transverse impedance 24, the Integral cross impedance for simulated dual human body medium's passage
25, the overall output impedance 26 for simulated dual human body medium's passage；
Receiving terminal model 3, main analog human body communication receiver, including：Receive termination electrode-human contact's impedance 31, people
Body communication receiver model 32, that is, transmitter impedance is received, it is neglected greatly depending on the reception transmitter of selection.
In above-mentioned impedance in addition to human body-human contact's impedance, calculating at home and abroad can be found among correlative theses
Method, such as：With different transmission path human body communication analogy method (Song, Q.Hao, K.Zhang, M.Wang, Y.Chu,
and B.Kang,“The Simulation Method of the Galvanic Coupling Intrabody
Communication With Different Signal Transmission Paths”IEEE
Trans.Instrum.Meas.,vol.60,no.pp.1257-1266,Apr.2011.).In the present embodiment, the transmitter of use
Voltage peak-to-peak value is 5V, and transmitter internal resistance is 50 Ω, and receiver impedance is 1M Ω.
Step 2, establish the circuit model of human body-human contact's impedance；
First, the geometrical model of contact impedance when human body-human body is shaken hands is established.As shown in Fig. 2 (a), the hand of people can be divided into
Palm and finger.Under normal circumstances, when two people shake hands, main part fully contacts for the palm of two human hands, such as Fig. 2 (b) institutes
Show.Meanwhile two the finger part of people then gently contacted with other side's hand back part, but due to finger and the contact area of hand back part
It is relatively small, the influence of finger touch part can be neglected.Therefore, two hands in the state of shaking hands can be abstracted as close by two
The geometrical model that cuboid is formed is contacted, its contact area is identical with palm, as shown in Fig. 2 (c).The present embodiment human body-
During the Geometric Modeling of human contact's impedance, the palm of people is abstracted as a multilayer cuboid, its length and human hand palm
The approximation of partial profile length is equal；Meanwhile by the cuboid be equally divided into skin, fat, muscle, cancellous bone and
Five layers of compact bone substance, experiment prove, this kind abstract and hierarchical mode can obtain relatively good effect, is not limited to herein certainly
Such a abstract and layering.
Secondly, based on above-mentioned Geometric Modeling, the circuit model of human body-human contact's impedance is established.As shown in figure 3, human body-
The circuit network that the circuit model of human contact is made up of some unit transverse impedances and some unit longitudinal impedances forms.Its
In, 231 be human body A palm portion unit transverse impedance, and 232 be human body B palm portion unit transverse impedance, and 233 be people
Body A, human body B palm contacts part whole geometry model unit longitudinal impedance.The number of the unit impedance number is according to people
The size of body-human body contact portion determines.
Step 3, calculate human body-human contact's impedance
First, the unit transverse impedance in the circuit model of human body-human contact's impedance is calculated.According to retouching for step 2
State, the palm of people is abstracted as a multilayer cuboid, its length is expressed as L, M, H, as shown in figure 4, △ L are represented
For the unit length of palm.In the present embodiment, solved using 1mm as unit length.Experiment proof, the unit length
Dividing mode can obtain relatively good effect, be not limited to such a mode herein certainly.Due to the human body as shown in Fig. 4 (a)
Palm model is by five-ply weave, i.e. skin, fat, muscle, cancellous bone and compact bone substance, forms, by the palm model of unit length
It is considered as the parallel form of five-ply weave layer, as shown in Fig. 4 (b), then transverse impedance can be considered as five-ply weave layer counterpart impedance
Parallel circuit, as shown in Fig. 4 (c), wherein △ Zs, △ Zf, △ Zm,△ZCb,△ZbRespectively skin layer impedance, fatty layer impedance,
Muscle layer impedance, cancellous bone impedance, compact bone substance impedance.According to the geometric parameter of palm and each organized layer at respective frequencies
Electrical characteristic parameter, such as electrical conductivity and relative dielectric constant, unit transverse impedance is calculated by circuit equivalent, such as Fig. 4 (d) institutes
Show, wherein, △ ZCRepresent unit transverse impedance.
Secondly, the unit longitudinal impedance in the circuit model to human body-human contact's impedance is calculated.As shown in figure 5, when two
Individual palm be in shake hands state when, both be in close contact.To calculate the longitudinal impedance between palm A and palm B, by unit length
The palm model in close contact state is split in vertical direction, as shown in Fig. 5 (b).List in vertical direction
Bit length impedance can be considered the impedance string corresponding to palm contacts model inner skin, fat, muscle, cancellous bone and compact bone substance layer
Connection, as shown in Fig. 5 (c).According to the electrical characteristic parameter of the physical parameter of palm and each organized layer at respective frequencies, such as conductance
Rate and relative dielectric constant, unit longitudinal impedance is calculated by circuit equivalent, as shown in Fig. 5 (d), wherein △ ZVRepresent unit
Longitudinal impedance.
Finally, based in the human body calculated-human contact's impedance circuit model unit laterally, longitudinal impedance value, according to
According to the geometric parameter of two human body palms, the total resistance of circuit network as shown in Figure 3 is calculated, when as two human bodies are shaken hands
The impedance value of extremity part.
Step 4, establish the information exchange mathematical modeling based on current coupling type IBC.
The circuit model of human body-human contact's impedance is implanted into the information exchange overall circuit based on current coupling type IBC
Model, form the information exchange complete circuit model based on current coupling type IBC.Based on this, by circuit analysis, with reference to
The parameter of each impedance, draw the mathematical modeling of the information exchange based on current coupling type IBC.
The implementation process of the inventive method is illustrated exemplified by shaking hands for said process, for those skilled in the art
For, it is not difficult to similarly establish the information exchange modeling of human body-human body other parts contact with reference to said process.
Based on the above-mentioned information exchange modeling method based on current coupling type IBC, establish based on current coupling type IBC's
Information exchange model building device, the device include transmitting terminal model, contact medium model and the receiving terminal model being sequentially connected, three
Form a completion closed circuit；
The transmitting terminal model includes two transmitting termination electrode-people being connected respectively with human body communication transmitter model both ends
Body contact impedance；
The contact medium model include two sets of human body A being sequentially connected transverse impedance, human body-human contact's impedance and
Human body B transverse impedance, and the input impedance and output resistance that the two sets of impedances in this two sets of impedance both ends and this that are placed in are connected respectively
It is anti-, and two intersect impedance with this two sets of impedance interconnections；
The receiving terminal model includes two reception termination electrode-people being connected respectively with human body communication receiver model both ends
Body contact impedance.
Further, the human body-human contact's impedance is horizontal by some human body A of latticed connection intersected with each other unit
The circuit network formed to impedance, some human body B unit transverse impedance and some unit longitudinal impedances forms, circuit network
Total impedance is human body-human contact's impedance.
Further, the unit transverse impedance by each layer counterpart impedance in tissue hierarchical structure parallel circuit meter
The equiva lent impedance calculated, the longitudinal impedance are the string of each layer counterpart impedance in the two human body organizational hierarchys to contact with each other
The equiva lent impedance that connection circuit counting goes out.
Further, the tissue hierarchical structure is skin, fat, muscle, five layers of cancellous bone and compact bone substance.
Result of the test
The present invention is verified by emulating and testing, method is as follows：
The sinusoidal signal that signal generator generates is coupled into human body, is received by oscillograph, amplitude-frequency is calculated
Attenuation curve.Wherein, 3 groups of Physical Experiments have been carried out, it is right respectively that the copper annular emission that radius is 10mm is received into differential electrode
Claim the 20cm for being positioned over human body A and human body B arm, 30cm, 40cm place, i.e. two pairs of electrodes apart respectively 40cm, 60cm,
80cm；And each pair differential electrode is at a distance of 60mm.Experimental result is as shown in Figure 6, it is found that based on the double body of current coupling type
The different distance result of mathematical simulation signal attenuation curve of circuit model and the signal attenuation curve base of physical measurement experimental result
This is consistent.The validity of emulation, and the feasibility of system are demonstrated by experiment.
Above-described specific descriptions, the purpose, technical scheme and beneficial effect of invention are carried out further specifically
It is bright, it should be understood that the specific embodiment that the foregoing is only the present invention, the protection model being not intended to limit the present invention
Enclose, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., should be included in the present invention
Protection domain within.
Claims (10)
- A kind of 1. information exchange modeling method based on current coupling type IBC, it is characterised in that：Including following content：Establish base In the information exchange overall circuit model of current coupling type human body communication, the model is mainly included by for simulating human body communication hair The transmitting terminal model (1) of emitter, for simulating the more human body medium's models (2) for two human bodies for carrying out information exchange and for mould The closed circuit of receiving terminal model (3) composition of anthropomorphic body communication receiver；The transmitting terminal model (1) includes two transmitting terminal being connected respectively with human body communication transmitter model (11) both ends electricity Pole-human contact's impedance (1)；Human body communication transmitter model includes voltage source and its internal resistance being sequentially connected；More human body medium's models (2) include two sets of human body A being sequentially connected transverse impedance (22), human body-human contact Impedance (23) and human body B transverse impedance (24), and the two sets of impedances in this two sets of impedance both ends and this that are placed in be connected respectively it is defeated Enter impedance (21) and output impedance (26), and two intersect impedance (25) with this two sets of impedance interconnections；The receiving terminal model (3) includes two receiving terminal being connected respectively with human body communication receiver model (32) both ends electricity Pole-human contact's impedance (31).
- A kind of 2. information exchange modeling method based on current coupling type IBC according to claim 1, it is characterised in that： The circuit model of the human body-human contact's impedance (23) is horizontal by some human body A of latticed connection intersected with each other unit To impedance (231), some human body B unit transverse impedance (232) and with some unit longitudinal impedances (233) form circuit network Network forms, and the total impedance of circuit network is human body-human contact's impedance.
- A kind of 3. information exchange modeling method based on current coupling type IBC according to claim 2, it is characterised in that： The unit transverse impedance is impedance corresponding to 1mm unit lengths, therefore unit laterally hinders in human body-human contact's impedance (23) Anti- number N is the length L/1mm of human body-human body contact portion, and unit longitudinal impedance number K is N+1.
- 4. a kind of information exchange modeling method based on current coupling type IBC according to Claims 2 or 3, its feature exist In：The equivalent resistance that the unit transverse impedance is calculated by the parallel circuit of each layer counterpart impedance in tissue hierarchical structure Anti-, the longitudinal impedance is that the series circuit of each layer counterpart impedance in the two human body organizational hierarchys to contact with each other calculates Equiva lent impedance.
- A kind of 5. information exchange modeling method based on current coupling type IBC according to claim 4, it is characterised in that： The tissue hierarchical structure is skin, fat, muscle, five layers of cancellous bone and compact bone substance.
- A kind of 6. information exchange model building device based on current coupling type IBC, it is characterised in that：Including the transmitting terminal being sequentially connected Model, contact medium model and receiving terminal model, three form a completion closed circuit；The transmitting terminal model connects including two transmitting termination electrode-human bodies being connected respectively with human body communication transmitter model both ends Touch impedance；The contact medium model includes two sets of human body A being sequentially connected transverse impedance, human body-human contact's impedance and human body B transverse impedance, and the input impedance that is connected respectively of the two sets of impedances in this two sets of impedance both ends and this that are placed in and output impedance, with And two intersect impedance with this two sets of impedance interconnection；The receiving terminal model connects including two reception termination electrode-human bodies being connected respectively with human body communication receiver model both ends Touch impedance.
- A kind of 7. information exchange model building device based on current coupling type IBC according to claim 6, it is characterised in that： Some human body As unit transverse impedance of the human body-human contact's impedance by latticed connection intersected with each other, some human body B Unit transverse impedance and the circuit network composition that forms of some unit longitudinal impedances, the total impedance of circuit network be human body- Human contact's impedance.
- A kind of 8. information exchange model building device based on current coupling type IBC according to claim 7, it is characterised in that： The unit transverse impedance is impedance corresponding to 1mm unit lengths.
- 9. a kind of information exchange model building device based on current coupling type IBC according to claim 7 or 8, its feature exist In：The equivalent resistance that the unit transverse impedance is calculated by the parallel circuit of each layer counterpart impedance in tissue hierarchical structure Anti-, the longitudinal impedance is that the series circuit of each layer counterpart impedance in the two human body organizational hierarchys to contact with each other calculates Equiva lent impedance.
- A kind of 10. information exchange model building device based on current coupling type IBC according to claim 9, it is characterised in that： The tissue hierarchical structure is skin, fat, muscle, five layers of cancellous bone and compact bone substance.
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| CN107526881B (en) * | 2017-08-10 | 2020-11-10 | 浙江大学城市学院 | Lithium battery electrode impedance modeling method based on continuity derivation |
| CN111585661B (en) * | 2020-04-30 | 2021-09-28 | 中国科学院自动化研究所 | Modeling method, system and device based on human body communication channel transmission |
| CN111464206B (en) * | 2020-05-22 | 2023-11-07 | 福州大学 | Automatic impedance matching adjusting device and method for current coupling type human body communication |
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| CN101582097A (en) * | 2009-04-03 | 2009-11-18 | 北京理工大学 | Finite element human body modeling method oriented to human body communications |
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| CN101582097A (en) * | 2009-04-03 | 2009-11-18 | 北京理工大学 | Finite element human body modeling method oriented to human body communications |
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