CN107124295A - A kind of indoor visible light power distribution emulated computation method containing mirror-reflection - Google Patents
A kind of indoor visible light power distribution emulated computation method containing mirror-reflection Download PDFInfo
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- CN107124295A CN107124295A CN201710187837.5A CN201710187837A CN107124295A CN 107124295 A CN107124295 A CN 107124295A CN 201710187837 A CN201710187837 A CN 201710187837A CN 107124295 A CN107124295 A CN 107124295A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/145—Network analysis or design involving simulating, designing, planning or modelling of a network
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Abstract
The invention discloses a kind of indoor visible light power distribution emulated computation method containing mirror-reflection, which solve the problem of only considering diffusing reflection mode in traditional indoor visible light communication Channel Modeling, the main reflection mode that will only consider that irreflexive traditional reflective Mode change is consideration diffusing reflection and mirror-reflection combination of the invention, and give the method that mirror-reflection is used that calculates, it compensate for considering incomplete drawback during conventional channel modeling and simulating, from actual scene is more conformed to a certain extent, the further optimization of indoor visible light modeling is realized.
Description
Technical field
The invention belongs to technical field of visible light communication, more particularly to a kind of indoor visible light power containing mirror-reflection
Distributed simulation computational methods.
Background technology
Different only with the method for diffusing reflection pattern from traditional indoor visible light modeling pattern, the modeling method will be unrestrained anti-
Penetrate and combine with mirror-reflection, why take this method, reason one：Many places can all decorate one in actual scene
Face mirror reaches the effect of expansion space；Reason two：Compared to diffusing reflection, mirror-reflection can obtain higher power；Reason
Three：An incident ray is only possible to produce an emergent ray for mirror-reflection, so anti-by metope from certain point
It is mapped to another point and there was only a route, the influence that multi-path jamming is brought can be weakened to a certain extent compared with diffusing reflection,
It is that visible light communication brings more possibility so as to realize faster transmission speed.
1979, Gfeller and Bapst established indoor diffusing scattering infrared communication system model, are rung by system pulses
The characteristic of indoor channel should be represented, they think that indoor channel is divided into two parts：LOS and NLOS.LOS refers to straight from transmitter
Access the path of receiver；NLOS refers to be received from transmitter by being reached after wall, ceiling, the ground i.e. diffusing reflection of object
The path of device.1993, Barry had also been proposed a kind of based on Lambertian radiation on the basis of the diffusing reflection model that Gfeller is proposed
The indoor infrared communication channel model of model.The model is divided into all planes smaller unit, for anti-for the first time
Penetrate, each unit is seen the receiver of light source, try to achieve LOS luminous powers；For the second secondary reflection, then first time each
Receiving unit regards new light source as, then computes repeatedly, the power reflected.2010, Beijing University of Post ＆ Telecommunication's fourth lifted roc pin
To above-mentioned channel model when calculating multiple diffusing reflection the not enough situation of excessively complicated and precision, propose reflection sources independent interactive
Method calculates wall multiple reflections, this method avoid a large amount of repeated recursive operations, reduces the complexity calculated, improves
Operation efficiency.2014, Chowdhury et al. was by Deterministic Method and Modified Monte Carlo
Both algorithms of Method combine, and first reflection uses Deterministic Method, and its coreflection is used
Modified Monte Carlo Method, also improve the operational efficiency of algorithm while the degree of accuracy is ensured.
Since emulating first time, although all emulation improve the precision of result step by step, but are due to only to adopt
With irreflexive reflective-mode, and mirror-reflection this pith is have ignored, so simulation result is compared with actual conditions
There is a certain degree of error unavoidably.
The content of the invention
The technical problems to be solved by the invention are the deficiencies for background technology there is provided a kind of containing mirror-reflection
Indoor visible light power distribution emulated computation method, its incident ray for mirror-reflection is only possible to generation one and gone out
Light is penetrated, compared with diffusing reflection produces a plurality of reflection light, the standard of information is realized in the interference that multipath effect can be overcome to be brought
Really transmission.
The present invention uses following technical scheme to solve above-mentioned technical problem
A kind of indoor visible light power distribution emulated computation method containing mirror-reflection, is specifically comprised the following steps：
Step 1, the parameter required for setting；
Step 2, make vertical line from S points to minute surface, and extend that the line makes that the distance of extension line segment is equal to that S points put to hanging down away from
From so as to obtain coordinate of the S points on the virtual point S' of minute surface；
Step 3, virtual point S' and pip A is connected, and extends S'A and is intersected with ground；
Step 4, extension S'A and ground intersection points B point coordinate are obtained using the method for three point on a straight line；
Step 5, B point power is calculated according to specular reflectivity R, and calculated from S points to the time t of B points；
Step 6, when light reach B points after, done from the point of view of B light source and using diffusing reflection pattern to all directions transmitting light
Line, and then obtain the power distribution situation on ground and the impulse response of ground each point；
Step 7, by changing the size of minute surface and the position of minute surface, repeat step 2 arrives step 6, obtains different minute surfaces
Power distribution situation under parameter on ground.
It is used as a kind of the further excellent of indoor visible light power distribution emulated computation method containing mirror-reflection of the present invention
Scheme is selected, in step 1, the parameter includes the position of length, width and height, the position of light source, the reflectivity in each face and the minute surface in room
Put size.
It is used as a kind of the further excellent of indoor visible light power distribution emulated computation method containing mirror-reflection of the present invention
Scheme is selected, in step 4, the specific method of the three point on a straight line is
Wherein Ax, Ay, Az be A point coordinates, Bx, By, Bz be B point coordinates, S'x, S'y, S'z be S' point coordinates.
It is used as a kind of the further excellent of indoor visible light power distribution emulated computation method containing mirror-reflection of the present invention
Scheme is selected, in steps of 5, the specific of B point power is calculated as follows：
Wherein, n is the lambertian pattern of light source, and R is specular reflectivity, PSFor light source power, θ is SA and plane where light source
The angle of normal, Ψ is SA and the angle of plane where A points, ARThe area of minimum unit, D where A pointsSAFor S and A away from
From.
It is used as a kind of the further excellent of indoor visible light power distribution emulated computation method containing mirror-reflection of the present invention
Scheme is selected, in steps of 5, the specific of t is calculated as follows：Wherein, c
For the light velocity.
The present invention uses above technical scheme compared with prior art, with following technique effect：
1st, the present invention mainly will only consider irreflexive traditional reflective Mode change to consider diffusing reflection and mirror-reflection group
The reflection mode of conjunction, and give and calculate the method that is used of mirror-reflection, during compensate for conventional channel modeling and simulating
Consider incomplete drawback, from actual scene is more conformed to a certain extent, realize the further of indoor visible light modeling
Optimization；
2nd, the direction of propagation for the reflection light that the present invention uses the mirror image up to the pip on ground to calculate these light,
Compared with tradition is only with irreflexive method, amount of calculation can be greatly reduced；
3rd, adjusted present invention is generally directed to reflective-mode, it is anti-to introduce minute surface in single diffusing reflection pattern
Penetrate, and the method for giving solution to the signal transmission path problem of mirror-reflection, it is irreflexive without considering further that
The uncertain problem of reflection ray angle, enormously simplify the complexity of system, and can overcome to a certain extent many
Footpath is disturbed, and improves the accuracy of system.
Brief description of the drawings
Fig. 1 is the reflection light direction of mirror-reflection.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：
The present invention thinking be that existing visible ray indoor communications channel model is improved, introduce mirror-reflection with
Afterwards, for reaching the light of the minute surface, the reflective-mode of mirror-reflection will be taken, an incident ray only produces an emergent light
Line, so as to overcome the interference that multipath effect is brought to a certain extent, and is asked without the concern for the complexity of diffusing reflection reflection light
Topic, enormously simplify the complexity of signal transmission, can also obtain the distribution of more accurate indoor power.
A kind of indoor visible light power distribution emulated computation method containing mirror-reflection, as shown in Figure 1：It is specific to include such as
Lower step：
Step 1, the parameter required for setting；Length, width and height of the parameter comprising room, the position of light source, the reflection in each face
The position size of rate and minute surface.
Step 2, make vertical line from S points to minute surface, and extend that the line makes that the distance of extension line segment is equal to that S points put to hanging down away from
From so as to obtain coordinate of the S points on the virtual point S' of minute surface；
Step 3, virtual point S' and pip A is connected, and extends S'A and is intersected with ground；
Step 4, extension S'A and ground intersection points B point coordinate are obtained using the method for three point on a straight line；The three point on a straight line
Specific method is
Wherein Ax, Ay, Az be A point coordinates, Bx, By, Bz be B point coordinates, S'x, S'y, S'z be S' point coordinates.
Step 5, B point power is calculated according to specular reflectivity R, and calculated from S points to the time t of B points；Then B points pulse
Respond and be：B points can be reached due to there are many paths to pass through reflection, it is that B points are received that most each impulse response accumulation, which is got up, at last
General power；The specific of B point power is calculated as follows：
Wherein, n is the lambertian pattern of light source, and R is specular reflectivity, PSFor light source power, θ is SA and plane where light source
The angle of normal, Ψ is SA and the angle of plane where A points, ARThe area of minimum unit, D where A pointsSAFor S and A away from
From.
The specific of t is calculated as follows：
Step 6, when light reach B points after, done from the point of view of B light source and using diffusing reflection pattern to all directions transmitting light
Line, and then obtain the power distribution situation on ground and the impulse response of ground each point；
Step 7, by changing the size of minute surface and the position of minute surface, repeat step 2 arrives step 6, obtains different minute surfaces
Power distribution situation under parameter on ground.
Diffusing reflection, is to project the phenomenon that light on a rough surface reflects to all directions.When a branch of parallel incident light
When line is mapped to coarse surface, although incident ray is parallel to each other, because the normal direction of each point is inconsistent, cause reflection light to
Different directions are irregularly reflected, and mirror-reflection and irreflexive unique difference are exactly that the reflecting surface of mirror-reflection is relatively flat,
Thus optical beam ratio is relatively unified and reflection direction is than more consistent.
Mirror-reflection follows the reflection law of light, and the property of its imaging is upright, waits big, positioned at object heteropleural
The virtual image, meeting left and right is opposite.
The reflection law of light：1. angle of reflection is equal to incidence angle；
2. incident ray, reflection light is in the same plane；
3. incident ray and reflection light are located at normal both sides.
Irreflexive reflection light can be propagated to all directions in traditional emulation mode, so neither one is true
Fixed angle, and the reflection light of mirror-reflection only has one, and according to its reflection law, its reflection direction be it is certain,
This is also to introduce the problem of mirror-reflection needs to solve with post-simulation.Due to directly seeking light source to the reflection light of certain point, no
Only to consider normal direction, while the problem of must also considering coplanar, this undoubtedly needs many restrictive conditions.
So set forth herein a kind of method of solution：Only need to consider the virtual image of the light source on minute surface, the virtual image and reflection
The extended line of the line of point is exactly reflection light (such as Fig. 1) at this, so only requiring that the intersection point on extended line and ground just can be with
The propagation path of the light is determined, the calculating of the heavier condition such as coplanar, normal is also may dispense with.After light reaches ground,
Because ground still uses diffusing reflection pattern, according to Deterministic Method, the point will launch light beam to each unit
Line, and to calculate reach minute surface light the direction of propagation, can take with light source identical method, use up to the anti-of ground
The mirror image of exit point calculates the direction of propagation of the reflection light of these light.
Step one：The size of minute surface is manually set on a certain wall, as shown in figure 1, in 5m*5m*3m room, I
Set whole left side wall as minute surface, reflectivity R1=0.9, its excess-three sidewalls and ceiling use irreflexive side
Formula, reflectivity R2=0.8, the reflectivity R3=0.3 on ground；
Step 2：Set good after basic parameter, we only need to consider the virtual image of the light source on minute surface for mirror-reflection,
The extended line of the line of the virtual image and pip is exactly the reflection light at this, so only requiring the intersection point on extended line and ground just
The propagation path of the light can be determined.LED on ceiling is as a light source S, and the B points positioned at ground are exactly to pass through
The position that light is reached after A point reflections on minute surface, so S points have two kinds of paths to B points：LOS and NLOS.Because LED is used
Lambertian source, so its LOS power can be obtained directly.For NLOS power, the light of minute surface is not reached still using unrestrained
The mode of reflection, and the light of minute surface is reached then by the way of mirror-reflection, by being divided to minute surface, we can obtain
LED reaches the power of each unit, and such as P (A) can then be obtained according to LOS methods, and due to incident ray SA and reflected light
Line AB is coplanar, and S' is S mirror image, and according to the propagation property of light, S'A and AB should be conllinear, by formula
Known Ax, Ay, Az, Bz, it is easy to obtain Bx, By, so as to obtain the coordinate of B points, and the power P (B) of B points
=P (A) * R1, R1 are the reflectivity of minute surface.
And propagation time of the light from S to B is also easy to obtain,
C is the light velocity.
Irreflexive reflection light can be propagated to all directions in above formula, with traditional emulation mode,
The angle that neither one is determined compares, and the reflection light of mirror-reflection only has one, and according to its reflection law, it reflects
Direction is certain, by method presented herein, can directly seek light source to the light communication process of a certain receiver, and
And receiving power when being easy to obtain the time required for transmitting and reaching receiver, and without the concern for normal direction
And it is coplanar the problem of, this undoubtedly greatly reduces required amount of calculation.
And for more high order reflection when reach the light of the minute surface and can then use identical method, such as when light is arrived
Up to after ground, ground uses diffusing reflection pattern, according to Deterministic Method, and the point will launch a branch of to each unit
Light, then will some light to reach minute surface, and to calculate the arrival minute surface back reflection light of some light, then
The direction of propagation of the reflection light of these light can be calculated using the mirror image B ' of B points.
Step 3：We can change the size of minute surface according to actual needs, such as certain part needs to concentrate some to come
Faster transmission speed is reached, so we just only can load onto minute surface in some parts, and all be loaded onto without whole face wall, in section
About cost while can also reach corresponding effect.
It was found from above-mentioned processing, the indoor visible light modeling method proposed by the present invention containing mirror-reflection can effectively subtract
The quantity of light considered is needed in few simulation process, and is easy to obtain the propagation path of light, is weakening multi-path jamming
While, it also compensate for only considering irreflexive weak point in conventional chamber in visible light channel modeling process, make Channel Modeling
It is further improved.
Claims (5)
1. a kind of indoor visible light power distribution emulated computation method containing mirror-reflection, it is characterised in that：It is specific to include such as
Lower step：
Step 1, the parameter required for setting；
Step 2, vertical line is made from S points to minute surface, and extending the line makes the distance of extension line segment be equal to the distance that S points are put to hanging down, from
And obtain coordinate of the S points on the virtual point S' of minute surface；
Step 3, virtual point S' and pip A is connected, and extends S'A and is intersected with ground；
Step 4, extension S'A and ground intersection points B point coordinate are obtained using the method for three point on a straight line；
Step 5, B point power is calculated according to specular reflectivity R, and calculated from S points to the time t of B points；
Step 6, after light reaches B points, doing light source from the point of view of B and launching light to all directions using diffusing reflection pattern, enter
And obtain the impulse response of the power distribution situation on ground and ground each point；
Step 7, by changing the size of minute surface and the position of minute surface, repeat step 2 arrives step 6, obtains different minute surface parameters
Power distribution situation on lower ground.
2. a kind of indoor visible light power distribution emulated computation method containing mirror-reflection according to claim 1, its
It is characterised by：In step 1, the parameter includes length, width and height, the position of light source, the reflectivity in each face and the minute surface in room
Position size.
3. a kind of indoor visible light power distribution emulated computation method containing mirror-reflection according to claim 1, its
It is characterised by：In step 4, the specific method of the three point on a straight line is
Wherein Ax, Ay, Az be A point coordinates, Bx, By, Bz be B point coordinates, S'x, S'y, S'z be S' point coordinates.
4. a kind of indoor visible light power distribution emulated computation method containing mirror-reflection according to claim 1, its
It is characterised by：In steps of 5, the specific of B points power is calculated as follows：
Wherein, n is the lambertian pattern of light source, and R is specular reflectivity, PSFor light source power, θ is SA and plane normal where light source
Angle, Ψ is the angle of plane where SA and A points, ARThe area of minimum unit, D where A pointsSAFor S and A distance.
5. a kind of indoor visible light power distribution emulated computation method containing mirror-reflection according to claim 3, its
It is characterised by：In steps of 5, the specific of t is calculated as follows：Its
In, c is the light velocity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108229058A (en) * | 2018-01-31 | 2018-06-29 | 南京邮电大学 | A kind of design method containing empty lamp in visible light communication |
| CN111551182A (en) * | 2020-06-08 | 2020-08-18 | 中国人民解放军战略支援部队信息工程大学 | Visible light indoor terminal positioning method and visible light positioning system |
-
2017
- 2017-03-27 CN CN201710187837.5A patent/CN107124295A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108229058A (en) * | 2018-01-31 | 2018-06-29 | 南京邮电大学 | A kind of design method containing empty lamp in visible light communication |
| CN111551182A (en) * | 2020-06-08 | 2020-08-18 | 中国人民解放军战略支援部队信息工程大学 | Visible light indoor terminal positioning method and visible light positioning system |
| CN111551182B (en) * | 2020-06-08 | 2021-09-17 | 中国人民解放军战略支援部队信息工程大学 | Visible light indoor terminal positioning method and visible light positioning system |
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Application publication date: 20170901 |