CN105335564B - A kind of Wearable current mode human body channel modeling method of Electromagnetic field - Google Patents
A kind of Wearable current mode human body channel modeling method of Electromagnetic field Download PDFInfo
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- CN105335564B CN105335564B CN201510735461.8A CN201510735461A CN105335564B CN 105335564 B CN105335564 B CN 105335564B CN 201510735461 A CN201510735461 A CN 201510735461A CN 105335564 B CN105335564 B CN 105335564B
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Abstract
The present invention relates to a kind of Wearable current mode human body channel modeling method of Electromagnetic field, using current coupling signal transmission form, first establish the electric field model of human body communication, on this basis, the communications portion of Wearable, interelectrode parasitic capacitive impedance, the actual coupling capacitive reactances for measuring external environment etc. is equivalent into external circuit model, it is added to the model that Electromagnetic field is obtained in electric field model.Present invention improves the deficiency that existing channel modeling method ignores each interelectrode parasitic capacitive impedance, external environment coupling capacitive reactances and Wearable circuit etc., the integrality of perfect modeling, human body channel estimation is carried out using the Wearable current mode human body channel method of Electromagnetic field, it can reflect the truth of actual measurement environment, the characteristic of channel goodness of fit higher with real human body comprehensively.
Description
Technical field
The present invention relates to a kind of Wearable current mode human body channel modeling method of Electromagnetic field.
Background technology
Human body communication is the propagation of electrical signals technology using human body as transmission medium, in body area network especially medical treatment detection, fortune
The short-distance wireless communication fields such as dynamic monitoring, consumer electronics, soldier's monitoring are with a wide range of applications and market potential.Human body
Channel model is established as follow-up study human body channel capacity, human body channel estimation, design coding mode, optimization modulation system etc.
Application and development provides basis.Patent（Application number 200910081416.X）Propose a kind of finite element human body towards human body communication
Modeling method.Partes corporis humani position is carried out geometry according to profile nature to be abstracted, defines the interior geometry of partes corporis humani position, if
The electromagnetic property parameters of partes corporis humani position dielectric layer are put, connection partes corporis humani position forms complete Human-body Finite Element Model.Patent
（Application number 201410281066.2）It is proposed a kind of human body communication channel modeling method and system based on non-uniform dielectric.By people
Body is divided into multiple structural models by structure and structural model is abstracted into regular geometric body, and dielectric layer is carried out to structural model inside
Division, sets the thickness of each dielectric layer, and the equivalent electrical parameter of computation model.
In above-mentioned patent human body channel modeling is mainly based on circuit model and finite element model, is described with equiva lent impedance
Human body channel model, illustrates the signal transfer mechanisms of human body communication, to human body communication apparatus parameter（Configuring, be electric including electrode
The position of pole and carrier frequency etc.）Optimization be it is indispensable, but circuit model can not image announcement extrinsic motivated
Distribution situation of circulation way, electric current or voltage signal of the signal in human body in each layer tissue of human body, can not distinguish
The transmitting effect of different body parts.And it although can be good at rebuilding by transmission telecommunications for the finite element modeling of human body channel
Internal Potential distribution situation caused by number, realizes the visualization of signal transmission, but in the actual measuring environment of human body channel, often
Each interelectrode parasitic capacitive impedance and Wearable circuit are have ignored, such as Wearable internal signal sources, receiver
Deng influence of the input and output impedance to signal transmission, cause the imperfect of modeling, it is impossible to which reflection actual measurement environment is true comprehensively
Situation, makes the human body channel characteristic that measurement obtains not accurate enough.
In actual measuring environment, a complete human body communication system mainly by signal source, send and receive electrode, people
Body Model, receiver composition.The electric signal that signal source produces injects human body through sender electrode, in receiving terminal, passes through receiving electrode
Receive signal.Electrode is by by the metallic plate or the metal material of wire that necessarily handle and the conduction with electrolyte solution
Glue is formed, and directly and human contact, there are parasitic capacitive impedance between electrode.Interelectrode parasitic capacitive impedance is to influence signal
One of an important factor for transmission characteristic.When the signal frequency for inputting human body is sufficiently high, the parasitic capacitive impedance between electrode is not
It is negligible.Due to the energy exchange between test equipment and tested instrument, the work of measurand can be changed to a certain extent
State, therefore connecting signal source, receiver will consider influence of the instrument input and output impedance to accuracy of measurement when instrument.
Existing human body channel model often have ignored each interelectrode parasitic capacitive impedance and Wearable circuit,
Such as influence of the input and output impedance of Wearable internal signal sources, receiver to signal transmission, in order to overcome these not
Foot, the present invention devise a kind of Wearable current mode human body channel modeling method of Electromagnetic field, Wearable are led to
Believe part（Include sending module and receiving module）, interelectrode parasitic capacitive impedance, the coupling capacitive reactances etc. of external environment
Human external factor is equivalent into external circuit model, in conjunction with the human body electric field model of construction, is built by field road interface unit
Obtain the Wearable current mode human body channel model of Electromagnetic field.
The content of the invention
It is an object of the invention to provide a kind of Wearable current mode human body channel modeling method of Electromagnetic field,
The human body channel model of Electromagnetic field is established in corresponding software, carries out the research such as human body channel estimation, finite element simulation, can be comprehensively
The truth of reflection actual measurement environment, accuracy higher；More accurate modeling method is provided for the research of the human body characteristic of channel,
Abundant and development to human body communication theoretical (carrier frequency, coding mode, transmission rate etc.) provides foundation.
To achieve the above object, the technical scheme is that：A kind of Wearable current mode human body of Electromagnetic field
Channel modeling method, includes the following steps,
Step S1：According to the layering rule between human appearance feature and interior tissue, whole body human body or partial body are established
Model of geometrical features, then the model of geometrical features of whole body human body or partial body is respectively organized to set corresponding electromagnetism to join
Number, including electrical conductivity, relative dielectric constant, magnetic conductivity；
Step S2：The communications portion of Wearable includes sending module and receiving module, and wherein sending module is by signal
Source, input impedance composition, receiving module are made of receiver, output impedance, and consider parasitic appearance between electrode on this basis
Property impedance, external environment coupling capacitive reactances influence, by the communications portion of Wearable, interelectrode parasitic capacitive hinder
It is anti-, the coupling capacitive reactances of external environment is equivalent into circuit model；
Step S3：Using current coupling signal transmission form, by equivalent current mode field road interface unit by step S1
The human body electric field model of foundation is combined the Wearable current mode of composition Electromagnetic field with the step S2 circuit models established
Human body channel model；
Step S4：The wearing of the step S3 Electromagnetic fields established is used as using Maxwell equations or corresponding reduced form
The governing equation of formula device current type human body channel model；It is and special with the geometry of the step S1 whole body human bodies established or partial body
Boundary condition of the model as human body channel model is levied, this structure of human body channel model is used as using each corresponding electromagnetic property of tissue
Relation；Using the analytic method of electromagnetic field, semi analytical method or method of value solving, obtain electric signal and receiving terminal is transmitted to by transmitting terminal
Transmission equation, calculate path loss, phase offset, estimation channel capacity, transmission rate, the bit error rate, and then obtain field road
With reference to Wearable current mode human body channel model.
In an embodiment of the present invention, the whole body human body or the model of geometrical features of partial body include cylinder, ellipse
The geometrical model of sphere, cuboid or real human body.
In an embodiment of the present invention, in step s3, the current mode field road interface unit includes contact resistance, pole
Change voltage, hand capacity, the contact resistance is connected in parallel after being connected in series with polarizing voltage with the hand capacity.In this hair
In a bright embodiment, in step s 4, the Maxwell equations：
In formula,For magnetic field intensity；For free current density；For electric displacement vector；For electric field strength；For magnetic induction intensity；For charge density.
In an embodiment of the present invention, in step s 4, the corresponding reduced form of the Maxwell equations is Laplace
Equation：, wherein,Representing electrical conductivity, ω represents angular frequency,Represent permittivity of vacuum,Represent relative dielectric constant,For electric scalar potential.
Compared to the prior art, the invention has the advantages that：Present invention improves existing channel modeling method
Ignore the deficiency of each interelectrode parasitic capacitive impedance, external environment coupling capacitive reactances and Wearable circuit etc., it is complete
It has been apt to the integrality of modeling, human body channel estimation is carried out using the Wearable current mode human body channel method of Electromagnetic field,
It can reflect the truth of actual measurement environment, the characteristic of channel goodness of fit higher with real human body comprehensively.
Brief description of the drawings
Fig. 1 is the Wearable current mode human body channel model schematic of Electromagnetic field of the present invention.
Fig. 2 is the Wearable current mode human body channel model signal of Electromagnetic field of the present invention by taking human arm as an example
Figure.
Fig. 3 is the experimental result picture of the present invention.
In figure：The communications portion of 1- Wearables A, 2- current modes field road interface unit, 3,6- human body electric field models, 4-
The coupling capacitive reactances of external environment, the communications portion of 5- Wearables B, 7- parasitic capacitive impedances.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
Technical scheme is told about below in conjunction with specific embodiment.
As shown in Figs. 1-2, the Wearable current mode human body channel modeling method of a kind of Electromagnetic field of the invention, should
Method：The electric field model at human body or tissue position is constructed first：According to the layering between human appearance feature and interior tissue
Rule, establishes whole body human body or the model of geometrical features of partial body, which can be abstract geometry
The geometrical model of model, such as cylinder, spheroid or cuboid or real human body.To human geometry's characteristic model
In each tissue corresponding electromagnetic parameter, including electrical conductivity, relative dielectric constant, magnetic conductivity etc. are set.Electromagnetic field meets in human body
Maxwell equation groups：
In formulaFor magnetic field intensity；For free current density；For electric displacement vector；For electric field strength；For magnetic induction intensity；For charge density.
Secondly, the communications portion of Wearable includes sending module and receiving module, wherein sending module by signal source,
Input impedance forms, and receiving module is made of receiver, output impedance, as shown in the module 1 and module 5 of Fig. 1.And in this base
Parasitic capacitive impedance, the influence of external environment between consideration electrode on plinth, by the communications portion of Wearable, interelectrode parasitism
Capacitive reactances, and coupling capacitive reactances of external environment etc. are also equivalent into circuit model.
Furthermore by field road interface unit, electric field model is combined with circuit model.The Wearable of Electromagnetic field
Current mode human body channel modeling method, using current coupling signal transmission form, equivalent modules such as Fig. 1 of Qi Chang roads interface unit
Module 2 shown in, by field road interface unit by electric field model with circuit model be combined form the wearable of Electromagnetic field set
Standby current mode human body channel model.
Finally, the governing equation of field road model is used as using Maxwell equations or corresponding reduced form.Such as in electric current
Under coupled mode human body communication pattern, Maxwell equations can be reduced to Laplace's equation：, its
In,Representing electrical conductivity, ω represents angular frequency,Represent permittivity of vacuum,Represent relative dielectric constant,For scalar electricity
Position.And using the whole body human body of foundation or the model of geometrical features of partial body as the boundary condition of human body channel model, with each
Organize constitutive relation of the corresponding electromagnetic property as human body channel model；Using the analytic method of electromagnetic field, semi analytical method or number
It is worth method for solving, obtains the transmission equation that electric signal is transmitted to receiving terminal by transmitting terminal, calculate path loss, phase offset,
Estimate channel capacity, transmission rate, the bit error rate, obtain the Wearable current mode human body channel model of Electromagnetic field.This Shen
Please in current mode field road interface unit include contact resistance, polarizing voltage, hand capacity, the contact resistance and polarizing voltage
It is connected in parallel after being connected in series with the hand capacity
The Wearable current mode human body channel model of Electromagnetic field is as shown in Fig. 2, 1 and 5 represent wearable and set respectively
The standby communications portion of A and the communications portion of Wearable B；2 represent current mode field road interface unit；7 represent parasitic capacitive resistance
It is anti-；4 represent the coupling capacitive reactances of external environment；6 represent human body electric field model.To prove the necessity of field road model, herein
By taking human arm as an example, using the Electromagnetic field modeling method shown in Fig. 2, human arm channel field road model is built.By electric field
Model（EF）Result and field road model（C-EF）Channel estimation results and human experimentation（in-vivo）As a result contrasted.
As shown in figure 3, test result indicates that, the channel estimation based on field road model can preferably tally with the actual situation, field road model
Signal gain result has preferably uniformity with human experimentation data.Illustrate to carry out human body letter using Electromagnetic field modeling method
Road is estimated, closer to the real human body characteristic of channel, demonstrates a necessity for road model.
Above is presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, caused function are made
During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.
Claims (4)
- A kind of 1. Wearable current mode human body channel modeling method of Electromagnetic field, it is characterised in that：Include the following steps,Step S1：According to the layering rule between human appearance feature and interior tissue, the several of whole body human body or partial body are established What characteristic model, then respectively organizes to set corresponding electromagnetic parameter to the model of geometrical features of whole body human body or partial body, wraps Include electrical conductivity, relative dielectric constant, magnetic conductivity；Step S2：The communications portion of Wearable includes sending module and receiving module, and wherein sending module is by signal source, defeated Enter impedance composition, receiving module is made of receiver, output impedance, and considers parasitic capacitive resistance between electrode on this basis Anti-, external environment coupling capacitive reactances influences, by the communications portion of Wearable, interelectrode parasitic capacitive impedance, outer The coupling capacitive reactances of boundary's environment is equivalent into circuit model；Step S3：Using current coupling signal transmission form, step S1 is established by equivalent current mode field road interface unit Human body electric field model with the step S2 circuit models established be combined form Electromagnetic field Wearable current mode human body Channel model；Step S4：Wearable the setting of the step S3 Electromagnetic fields established is used as using Maxwell equations or corresponding reduced form The governing equation of standby current mode human body channel model；And with the step S1 whole body human bodies established or the geometric properties mould of partial body Boundary condition of the type as human body channel model, is closed using this structure of each corresponding electromagnetic property of tissue as human body channel model System；Using the analytic method of electromagnetic field, semi analytical method or method of value solving, obtain electric signal and receiving terminal is transmitted to by transmitting terminal Transmission equation, calculates path loss, phase offset, estimation channel capacity, transmission rate, the bit error rate, and then obtains field road knot The Wearable current mode human body channel model of conjunction；In step s3, the current mode field road interface unit includes contact resistance, polarizing voltage, hand capacity, described to connect Get an electric shock after resistance is connected in series with polarizing voltage and be connected in parallel with the hand capacity.
- 2. a kind of Wearable current mode human body channel modeling method of Electromagnetic field according to claim 1, it is special Sign is：The whole body human body or the model of geometrical features of partial body include cylinder, spheroid, cuboid or real human body Geometrical model.
- 3. a kind of Wearable current mode human body channel modeling method of Electromagnetic field according to claim 1, it is special Sign is：In step s 4, the Maxwell equations：In formula,For magnetic field intensity；For free current density；For electric displacement vector；For electric field strength；For magnetic induction intensity；For charge density.
- 4. a kind of Wearable current mode human body channel modeling method of Electromagnetic field according to claim 1, it is special Sign is：In step s 4, the corresponding reduced form of the Maxwell equations is Laplace equations：, wherein,Representing electrical conductivity, ω represents angular frequency,Represent permittivity of vacuum,Generation Table relative dielectric constant,For electric scalar potential.
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| CN107241153B (en) * | 2017-07-21 | 2021-03-30 | 深圳信息职业技术学院 | Impedance calculation device and method for body area network channel |
| CN111726143B (en) * | 2019-03-18 | 2021-07-20 | 清华大学 | Wireless body area network communication system |
| CN110932793B (en) * | 2019-11-25 | 2021-03-30 | 北京理工大学 | Combined electrode suitable for current/capacitance coupling type human body communication |
| CN113285766B (en) * | 2020-02-20 | 2022-12-13 | Oppo广东移动通信有限公司 | Signal transmission method and device for human body communication and human body communication transceiver |
| 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 |
| CN113810138B (en) * | 2021-09-24 | 2023-06-30 | 重庆邮电大学 | Multipath channel modeling method for dynamic on-body channel in wireless body area network |
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