CN105335564A - Field-circuit combined wearable device current-type human body channel modeling method - Google Patents
Field-circuit combined wearable device current-type human body channel modeling method Download PDFInfo
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Abstract
The invention relates to a field-circuit combined wearable device current-type human body channel modeling method. A current coupling signal transmission method is adopted, firstly a human body communication electric field model is established, enabling the parasitic capacitive impedance between communication parts and electrodes of the wearable device, actually measured external environment coupling capacitive impedance and the like to be equivalent to an external circuit model, and adding the external circuit model into the electric field model to obtain a field-circuit combined model. The field-circuit combined wearable device current-type human body channel modeling method improves the defect that an existing channel modeling method ignores the parasitic capacitive impedance among the electrodes, the external coupling capacitive impedance and the circuit of the wearable device and the like, perfects the integrity of modeling, performs human body channel estimation, can fully reflect the actual situations of actually measured environments and can realize higher fitness with real human body channel characteristics.
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 take human body as the propagation of electrical signals technology of transmission medium, detects, the short-distance wireless communication field such as motion monitoring, consumer electronics, soldier's monitoring is with a wide range of applications and market potential at body area network especially medical treatment.The application and developments such as the follow-up study human body channel capacity that is established as, the human body channel of human body channel model are estimated, design coded system, optimization modulation system provide basis.Patent (application number 200910081416.X) proposes a kind of finite element human body modeling method of human oriented body communication.Geometry is carried out according to profile nature in partes corporis humani position abstract, the interior geometry of definition partes corporis humani position, arranges the electromagnetic property parameters of partes corporis humani position dielectric layer, connects partes corporis humani position and forms complete Human-body Finite Element Model.Patent (application number 201410281066.2) proposes a kind of human body communication channel modeling method based on nonhomogeneous media and system.Human body is divided into multiple structural model by structure and structural model is abstracted into regular geometric body, dielectric layer division is carried out to structural model inside, the thickness of each dielectric layer is set, 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, with equiva lent impedance, human body channel model is described, set forth the signal transfer mechanisms of human body communication, indispensable to the optimization of human body communication apparatus parameter (comprising the configuration of electrode, the position of electrode and carrier frequency etc.), but the circulation way of announcement extrinsic motivated signal in human body, electric current or the distribution situation of voltage signal in each layer tissue of human body that circuit model can not be vivid, more can not distinguish the transmitting effect of different body part.Although and can be good at rebuilding by the body inner potential distribution situation sending electric signal and cause for the finite element modeling of human body channel, realize the visual of Signal transmissions, but in human body channel actual measurement environment, often have ignored each interelectrode parasitic capacitive impedance and Wearable circuit, if the input and output impedance of Wearable internal signal sources, receiver etc. is on the impact of Signal transmissions, cause the imperfect of modeling, can not reflect the truth of actual measurement environment, the human body channel characteristic that measurement is obtained is not accurate enough comprehensively.
In actual measurement environment, a complete human body communication system is primarily of signal source, transmission and receiving electrode, and manikin, receiver forms.The electric signal that signal source produces injects human body through sender electrode, at receiving end, by receiving electrode Received signal strength.Electrode is formed with the conducting resinl with electrolyte solution by the sheet metal through necessarily processing or metal material wiry, and direct and human contact, exists parasitic capacitive impedance between electrode.Interelectrode parasitic capacitive impedance is one of key factor affecting signal transmission characteristics.When the signal frequency inputting human body is enough high, the parasitic capacitive impedance between electrode be can not ignore.Due to the energy exchange between testing tool and tested instrument, the duty of measurand can be changed to a certain extent, therefore during the instrument such as connecting signal source, receiver, consider that instrument input and output impedance is on the impact of accuracy of measurement.
Existing human body channel model often have ignored each interelectrode parasitic capacitive impedance and Wearable circuit, as Wearable internal signal sources, the input and output impedance of receiver etc. is on the impact of Signal transmissions, not enough in order to overcome these, the present invention devises a kind of Wearable current mode human body channel modeling method of Electromagnetic field, by Wearable communications portion (comprising sending module and receiver module), interelectrode parasitic capacitive impedance, the human external factor equivalences such as the coupling capacitive reactances of external environment become external circuit model, the human body electric field model of combined structure again, the Wearable current mode human body channel model obtaining Electromagnetic field is built by field road interface unit.
Summary of the invention
The object of the present invention is 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 set up in corresponding software, carry out the researchs such as human body channel estimation, finite element simulation, can reflect the truth of actual measurement environment, accuracy is higher comprehensively; Research for the human body characteristic of channel provides more accurate modeling method, provides foundation to the abundant of human body communication theory (carrier frequency, coded system, transfer rate etc.) and development.
For achieving the above object, technical scheme of the present invention is: a kind of Wearable current mode human body channel modeling method of Electromagnetic field, comprises the steps,
Step S1: according to the layering rule between human appearance feature and interior tissue, set up the model of geometrical features of whole body human body or partial body, then the model of geometrical features of whole body human body or partial body is respectively organized and corresponding electromagnetic parameter is set, comprise conductivity, relative dielectric constant, magnetic permeability;
Step S2: the communications portion of Wearable comprises sending module and receiver module, wherein sending module is made up of signal source, input impedance, receiver module is made up of receiver, output impedance, and consider the coupling capacitive reactances impact of parasitic capacitive impedance between electrode, external environment on this basis, the equivalence of the coupling capacitive reactances of the communications portion of Wearable, interelectrode parasitic capacitive impedance, external environment is become circuit model;
Step S3: adopt current coupling signal transmission form, the human body electric field model set up by step S1 by the current mode field road interface unit of equivalence is combined with the circuit model that step S2 sets up and forms the Wearable current mode human body channel model of Electromagnetic field;
Step S4: the governing equation of the Wearable current mode human body channel model of the Electromagnetic field set up as step S3 using Maxwell equation or corresponding reduced form; And the model of geometrical features of the whole body human body set up using step S1 or partial body is as the boundary condition of human body channel model, using the corresponding electromagnetic property of each tissue as the constitutive relation of human body channel model; Adopt the analytical method of electromagnetic field, semi analytical method or method of value solving, obtain electric signal is transferred to receiving end transmission equation by transmitting terminal, calculate path loss, phase offset, estimation channel capacity, transfer rate, the bit error rate, and then obtain the Wearable current mode human body channel model of Electromagnetic field.
In an embodiment of the present invention, the model of geometrical features of described whole body human body or partial body comprises the geometric model of right cylinder, spheroid, rectangular parallelepiped or real human body.
In an embodiment of the present invention, in step s3, described current mode field road interface unit comprises contact resistance, polarizing voltage, hand capacity, is connected in parallel after described contact resistance and polarizing voltage are connected in series with described hand capacity.In an embodiment of the present invention, in step s 4 which, described Maxwell equation:
In formula,
for magnetic field intensity;
for free current density;
for electric displacement vector;
for electric field intensity;
for magnetic induction density;
for electric density.
In an embodiment of the present invention, in step s 4 which, the corresponding reduced form of described Maxwell equation is Laplace equation:
, wherein,
represent conductivity, ω represents angular frequency,
represent permittivity of vacuum,
represent relative dielectric constant,
for electric scalar potential.
Compared to prior art, the present invention has following beneficial effect: 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 perfect integrality of modeling, the Wearable current mode human body channel method of Electromagnetic field is adopted to carry out human body channel estimation, the truth of actual measurement environment can be reflected comprehensively, higher with the characteristic of channel goodness of fit of real human body.
Accompanying drawing explanation
Fig. 1 is the Wearable current mode human body channel model schematic of Electromagnetic field of the present invention.
Fig. 2 is that the present invention is for the Wearable current mode human body channel model schematic of the Electromagnetic field of human arm.
Fig. 3 is experimental result picture of the present invention.
In figure: the communications portion of 1-Wearable A, 2-current mode field road interface unit, 3,6-human body electric field model, the coupling capacitive reactances of 4-external environment, the communications portion of 5-Wearable B, the impedance of 7-parasitic capacitive.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is specifically described.
Technical scheme of the present invention is told about below in conjunction with specific embodiment.
As shown in Figure 1-2, the Wearable current mode human body channel modeling method of a kind of Electromagnetic field of the present invention, the method: the electric field model first constructing human body or tissue position: according to the layering rule between human appearance feature and interior tissue, set up the model of geometrical features of whole body human body or partial body, this human geometry's characteristic model can be abstract geometric model, as right cylinder, spheroid or rectangular parallelepiped etc., it also can be the geometric model of real human body.Corresponding electromagnetic parameter is arranged to tissue each in human geometry's characteristic model, comprises conductivity, relative dielectric constant, magnetic permeability etc.In human body, electromagnetic field meets Maxwell system of equations:
In formula
for magnetic field intensity;
for free current density;
for electric displacement vector;
for electric field intensity;
for magnetic induction density;
for electric density.
Secondly, the communications portion of Wearable comprises sending module and receiver module, and wherein sending module is made up of signal source, input impedance, and receiver module is made up of receiver, output impedance, if the module 1 of Fig. 1 is with shown in module 5.And consider the impact of parasitic capacitive impedance between electrode, external environment on this basis, by the communications portion of Wearable, interelectrode parasitic capacitive impedance, and the coupling capacitive reactances of external environment etc. also equivalence become circuit model.
Moreover, by field road interface unit, electric field model is combined with circuit model.The Wearable current mode human body channel modeling method of Electromagnetic field, adopt current coupling signal transmission form, electric field model, as shown in the module 2 of Fig. 1, to be combined with circuit model by field road interface unit and forms the Wearable current mode human body channel model of Electromagnetic field by the equivalent modules of Qi Chang road interface unit.
Finally, using Maxwell equation or corresponding reduced form as the governing equation of field road model.Such as under current coupling type human body communication pattern, Maxwell equation can be reduced to Laplace's equation:
, wherein,
represent conductivity, ω represents angular frequency,
represent permittivity of vacuum,
represent relative dielectric constant,
for electric scalar potential.And using the model of geometrical features of the whole body human body set up or partial body as the boundary condition of human body channel model, using the corresponding electromagnetic property of each tissue as the constitutive relation of human body channel model; Adopt the analytical method of electromagnetic field, semi analytical method or method of value solving, obtain electric signal is transferred to receiving end transmission equation by transmitting terminal, calculate path loss, phase offset, estimate channel capacity, transfer rate, the bit error rate, obtain the Wearable current mode human body channel model of Electromagnetic field.Current mode field road interface unit in the application comprises contact resistance, polarizing voltage, hand capacity, is connected in parallel after described contact resistance and polarizing voltage are connected in series with described hand capacity
As shown in Figure 2,1 and 5 represent the communications portion of Wearable A and the communications portion of Wearable B to the Wearable current mode human body channel model of Electromagnetic field respectively; 2 represent current mode field road interface unit; 7 represent parasitic capacitive impedance; The coupling capacitive reactances of 4 expression external environments; 6 represent human body electric field model.For proving the necessity of field road model, this sentences human arm is example, adopts the Electromagnetic field modeling method shown in Fig. 2, builds human arm channel field road model.The channel estimation results on the result of electric field model (EF) and field road model (C-EF) and human experimentation (in-vivo) result are contrasted.As shown in Figure 3, experimental result shows, the channel estimating based on field road model can tally with the actual situation preferably, and signal gain result and the human experimentation data of field road model have consistance preferably.Illustrate and adopt Electromagnetic field modeling method to carry out human body channel estimation, closer to the real human body characteristic of channel, demonstrate a necessity for road model.
Be more than preferred embodiment of the present invention, all changes done according to technical solution of the present invention, when the function produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (5)
1. a Wearable current mode human body channel modeling method for Electromagnetic field, is characterized in that: comprise the steps,
Step S1: according to the layering rule between human appearance feature and interior tissue, set up the model of geometrical features of whole body human body or partial body, then the model of geometrical features of whole body human body or partial body is respectively organized and corresponding electromagnetic parameter is set, comprise conductivity, relative dielectric constant, magnetic permeability;
Step S2: the communications portion of Wearable comprises sending module and receiver module, wherein sending module is made up of signal source, input impedance, receiver module is made up of receiver, output impedance, and consider the coupling capacitive reactances impact of parasitic capacitive impedance between electrode, external environment on this basis, the equivalence of the coupling capacitive reactances of the communications portion of Wearable, interelectrode parasitic capacitive impedance, external environment is become circuit model;
Step S3: adopt current coupling signal transmission form, the human body electric field model set up by step S1 by the current mode field road interface unit of equivalence is combined with the circuit model that step S2 sets up and forms the Wearable current mode human body channel model of Electromagnetic field;
Step S4: the governing equation of the Wearable current mode human body channel model of the Electromagnetic field set up as step S3 using Maxwell equation or corresponding reduced form; And the model of geometrical features of the whole body human body set up using step S1 or partial body is as the boundary condition of human body channel model, using the corresponding electromagnetic property of each tissue as the constitutive relation of human body channel model; Adopt the analytical method of electromagnetic field, semi analytical method or method of value solving, obtain electric signal is transferred to receiving end transmission equation by transmitting terminal, calculate path loss, phase offset, estimation channel capacity, transfer rate, the bit error rate, and then obtain the Wearable current mode human body channel model of Electromagnetic field.
2. the Wearable current mode human body channel modeling method of a kind of Electromagnetic field according to claim 1, is characterized in that: the model of geometrical features of described whole body human body or partial body comprises the geometric model of right cylinder, spheroid, rectangular parallelepiped or real human body.
3. the Wearable current mode human body channel modeling method of a kind of Electromagnetic field according to claim 1, it is characterized in that: in step s3, described current mode field road interface unit comprises contact resistance, polarizing voltage, hand capacity, is connected in parallel after described contact resistance and polarizing voltage are connected in series with described hand capacity.
4. the Wearable current mode human body channel modeling method of a kind of Electromagnetic field according to claim 1, is characterized in that: in step s 4 which, described Maxwell equation:
In formula,
for magnetic field intensity;
for free current density;
for electric displacement vector;
for electric field intensity;
for magnetic induction density; For electric density.
5. the Wearable current mode human body channel modeling method of a kind of Electromagnetic field according to claim 1, is characterized in that: in step s 4 which, and the corresponding reduced form of described Maxwell equation is Laplace equation:
, wherein,
represent conductivity, ω represents angular frequency,
represent permittivity of vacuum,
represent relative dielectric constant,
for electric scalar potential.
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| CN111585661A (en) * | 2020-04-30 | 2020-08-25 | 中国科学院自动化研究所 | Modeling method, system and device based on human body communication channel transmission |
| CN111726143A (en) * | 2019-03-18 | 2020-09-29 | 清华大学 | Wireless body area network communication system |
| CN113285766A (en) * | 2020-02-20 | 2021-08-20 | 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 |
| CN113810138A (en) * | 2021-09-24 | 2021-12-17 | 重庆邮电大学 | Multipath channel modeling method for dynamic on-body channel in wireless body area network |
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| CN113285766A (en) * | 2020-02-20 | 2021-08-20 | 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 |
| CN111585661A (en) * | 2020-04-30 | 2020-08-25 | 中国科学院自动化研究所 | Modeling method, system and device based on human body communication channel transmission |
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| CN113810138A (en) * | 2021-09-24 | 2021-12-17 | 重庆邮电大学 | Multipath channel modeling method for dynamic on-body channel in wireless body area network |
| 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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