CN110572209A - Indoor visible light communication LED optimal layout method and system - Google Patents
Indoor visible light communication LED optimal layout method and system Download PDFInfo
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- CN110572209A CN110572209A CN201910944939.6A CN201910944939A CN110572209A CN 110572209 A CN110572209 A CN 110572209A CN 201910944939 A CN201910944939 A CN 201910944939A CN 110572209 A CN110572209 A CN 110572209A
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an indoor visible light communication LED optimal layout method and system, which construct position vectors of particles by using lamp coordinates, update velocity vectors of the particles by using velocity, and achieve the aim of optimizing the power variation range of a receiver by using the variance of received light power on a communication plane as a fitness function. The present disclosure is based on the fact that the location and number of lamps are two key factors that affect the received signal-to-noise ratio. When the lamps are arranged, the lamps are arranged in the middle of the ceiling, so that the signal-to-noise ratio distribution on the communication plane tends to be uniform. The received power is an important factor influencing the quality and the capacity of the VLC system, the system communication quantity can be improved by solving the lamp power through the particle swarm algorithm, and the problem of uneven equal power is fundamentally solved.
Description
Technical Field
The invention belongs to the field of optical communication, and particularly relates to an indoor visible light communication LED optimal layout method and system.
Background
the statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the layout of indoor LEDs generally adopts a subjective layout mode, which may cause different communication qualities obtained at different positions, and further cause uneven layout of indoor visible light, which may not meet the requirements of customers.
in order to ensure the quality of the visible light communication system, an equalized power distribution is required. In an indoor VLC system, users are randomly distributed at different indoor locations. How to ensure that the locations of these users get the same communication quality, how to ensure that a uniform distribution of received signal-to-noise ratios (SNRs) has a significant impact on indoor vlc communication quality.
Disclosure of Invention
in order to overcome the defects of the prior art, the invention provides an indoor visible light communication LED optimal layout method, which ensures that a receiving user obtains the best communication performance at any position by a deep learning method, and realizes effective improvement of the communication performance by changing the position, the transmitting power and the half-power angle of an LED array.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
The indoor visible light communication LED optimal layout method comprises the following steps:
the position vector of the particle is constructed by utilizing the lamp coordinate, the velocity vector of the particle is updated by utilizing the velocity, and the variance of the received light power on the communication plane is taken as a fitness function, so that the aim of optimizing the power variation range of the receiver is achieved.
Further, the LED arrays are placed on the same plane and have lambertian radiation patterns, and each LED is biased at a recommended bias point in the data table.
In the VLC system, each point in the communication plane is made to be equally important, and users in a room can receive the same signal strength no matter where the users are;
The total number of LEDs is N, and each LED array is filled with N0A number of LED arraysThe uniformity of the received power is measured by using the variance of the light receiving power on the communication plane, and the smaller the power variance is, the higher the power uniformity is, and the LED optimization layout problem is expressed as a minimum light receiving power solving problem.
According to the further technical scheme, during solving, a J particle swarm is initialized by using a random position vector and a speed;
Calculating the fitness of all the particles;
updating the velocity and position vectors of the jth particle;
Calculating the fitness of the new position vector;
The derived variance of the received optical power satisfies an optimal solution of the set condition.
the invention also discloses an indoor visible light communication LED optimal layout system, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor executes the program to realize the following steps:
The position vector of the particle is constructed by utilizing the lamp coordinate, the velocity vector of the particle is updated by utilizing the velocity, and the variance of the received light power on the communication plane is taken as a fitness function, so that the aim of optimizing the power variation range of the receiver is achieved.
the invention also discloses a computer readable storage medium having a computer program stored thereon, characterized in that the program, when executed by a processor, implements the steps of:
the position vector of the particle is constructed by utilizing the lamp coordinate, the velocity vector of the particle is updated by utilizing the velocity, and the variance of the received light power on the communication plane is taken as a fitness function, so that the aim of optimizing the power variation range of the receiver is achieved.
the above one or more technical solutions have the following beneficial effects:
The present disclosure is based on the fact that the location and number of lamps are two key factors that affect the received signal-to-noise ratio. When the lamps are arranged, the lamps are arranged in the middle of the ceiling, so that the signal-to-noise ratio distribution on the communication plane tends to be uniform. The received power is an important factor influencing the quality and the capacity of the VLC system, the system communication quantity can be improved by solving the lamp power through the particle swarm algorithm, and the problem of uneven equal power is fundamentally solved.
Based on the layout scheme, the receiving power distribution range of the optimized layout is-6.61 dbm to-8.88 dbm, and compared with the uniform layout, the receiver power variation range of the optimized layout is smaller.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic view of an indoor visible light communication scheme according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a layout scheme of an led array according to an embodiment of the present invention;
FIG. 3 is a flowchart of an algorithm according to an embodiment of the present invention;
FIG. 4 is an optimized front optical power diagram;
Fig. 5 is an optimized optical power diagram.
Detailed Description
it is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The general idea provided by the invention is as follows:
in order to solve the problem of led layout and optimization of receiving uniformity, a Particle Swarm Optimization (PSO) is provided, a position vector of a particle is constructed by using lamp coordinates, a velocity vector of the particle is updated by using a velocity, and the variance of receiving optical power on a communication plane is used as a fitness function, so that the aim of optimizing the power variation range of a receiver is achieved.
example one
the embodiment discloses an indoor visible light communication LED optimal layout method, according to the European lighting standard, assuming that LED arrays are placed on the same plane and have Lambertian radiation patterns, the required minimum illumination intensity is 400 lx. Each LED was biased at the recommended bias point in the data table (i.e., 350mA) and had a light output power of 189 mW.
In a VLC system, there are many links between the transmitter and receiver, including line-of-sight and reflected links that reflect 95.16%, 3.57%, and 1.27% of light to received light, respectively. The LOS light thus determines the performance of the VLC system, and the power of the received light signal by the VLC receiver is as follows:
in the formula, PtIs the transmitted power of the lamp, Hd(0) Is the DC gain of the LOS channel, Href(0) is the dc gain of the reflection channel.
in order to obtain the maximum value of the received optical power on the communication plane, parameter values such as the photoelectric conversion efficiency, the refractive index of the lens, the FOV of the PD, the physical area of the receiver, and the transmitted optical power are fixed. In an actual VLC system, it is assumed that every point in the communication plane (as shown in fig. 1) is equally important, and the user in the room should receive the same signal strength no matter where the user is. The total number of LEDs is N. Each LED array is filled with N0A number of LED arrayshere, the uniformity of the received power is measured by using the variance of the light received power on the communication plane, and the smaller the power variance, the higher the power uniformity. Therefore, the LED optimal layout problem can be expressed as a minimum light receiving power, that is:
min{D(Pr)} (2)
Wherein x is more than or equal to 01,x2,...,xN≤L,0≤y1,y2,...,yN≤W。
Where N is the number of LED lamps and L and W represent the length and width of the room, respectively. D (P)r) Is the variance of the received light power in the communication plane, and the coordinates x and y represent the horizontal and vertical coordinates of each lamp, respectively, where
D(Pr)＝E{[Pr-E(Pr)]2} (3)
The xy coordinates of the N distributed LEDs are composed of a position vector of one particle, the number of the particles is J, an initial position vector and a velocity vector of each particle are randomly generated, namely each element in the initial position vector is from DsRandomly selected in the area.
In the PSO algorithm, the position vector and velocity vector of the jth (j ═ 1, · · j) particle are:
Xj(t)＝[xj,1(t),xj,2(t),...xj,M/2(t),yj,1(t),yj,2(t),...yj,M/2(t)]T (5)
Vj(t)＝[vj,1(t),vj,2(t),...vj,M(t)]T (6)
The particle swarm algorithm updates the current position of each particle with the velocity. The particle velocity and position update rule of the jth (j ═ 1, · · j) particle consists of
Xj(t+1)＝Xj(t)+Vj(t+1) (8)
where t is the number of iterations; vj (t) Vj(t) is the velocity of the jth particle at the number of iterations t; xj(t) is the position of the jth particle at the number of iterations t,Is the jth particle best solution at iteration t; pglocalIs the global optimal solution for the iteration time t; ζ and η are random numbers between (0, 1); the learning factors a and b have great influence on the convergence speed of the algorithm and need to be adjusted through experiments; inertial weight wtGiven by:
Wherein wmax,wmin,MmaxMaximum weight, minimum weight and maximum number of iterations allowed, respectively.
referring to FIG. 3, a particle swarm optimization algorithm
Inputting: ds，N，Mmax；
and (3) outputting: pglocal
STEP 1: initializing a J particle swarm by using a random position vector and a speed;
STEP 2: calculating the fitness of all particlesAnd Pglocal；
Step 3: updating the velocity and position vectors of the jth particle according to equations (6) (7);
Step 4: calculating the fitness of the new position vector according to equation (2);
Step 5: if the new position vector is better thanThe new position vector will be recorded as
If the new position vector is better than PglocalA 1 is to PglocalUpdating to a new position vector;
step 6: if the end condition t ≧ M is satisfiedmaxand at DsMiddle, position vector PglocalOf derived received optical powerthe variance satisfies (2), then PglocalIs the optimal solution;
Otherwise, no optimal solution exists.
In the specific implementation example, the indoor light wireless scheme scene is shown in fig. 1, a plurality of LED arrays are installed on the ceiling for illuminating the room and transmitting information, L, W and H are respectively used as the length, width and height of the room. Here, θ denotes an irradiation angle between the emitted light to an axis perpendicular to the emission plane, and α is an incident angle with respect to an axis perpendicular to the reception plane. As shown in fig. 2, the total number of LEDs is N. Each LED array is filled with N0a number of LED arraysThe length and width of each LED array are respectively L0,W0。
It can be seen in fig. 4 and 5 that the receive power distribution of the optimized layout ranges from-6.61 dbm to-8.88 dbm, and the range of receiver power variation of the optimized layout is smaller compared to the uniform layout.
example II
The invention also discloses an indoor visible light communication LED optimal layout system, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor executes the program to realize the following steps:
The position vector of the particle is constructed by utilizing the lamp coordinate, the velocity vector of the particle is updated by utilizing the velocity, and the variance of the received light power on the communication plane is taken as a fitness function, so that the aim of optimizing the power variation range of the receiver is achieved.
Example III
The invention also discloses a computer readable storage medium having a computer program stored thereon, characterized in that the program, when executed by a processor, implements the steps of:
The position vector of the particle is constructed by utilizing the lamp coordinate, the velocity vector of the particle is updated by utilizing the velocity, and the variance of the received light power on the communication plane is taken as a fitness function, so that the aim of optimizing the power variation range of the receiver is achieved.
The steps involved in the apparatuses of the second and third embodiments correspond to those of the first embodiment of the method, and the detailed description thereof can be found in the relevant description of the first embodiment. The term "computer-readable storage medium" should be taken to include a single medium or multiple media containing one or more sets of instructions; it should also be understood to include any medium that is capable of storing, encoding or carrying a set of instructions for execution by a processor and that cause the processor to perform any of the methods of the present invention.
Those skilled in the art will appreciate that the modules or steps of the present invention described above can be implemented using general purpose computer means, or alternatively, they can be implemented using program code that is executable by computing means, such that they are stored in memory means for execution by the computing means, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps of them are fabricated into a single integrated circuit module. The present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (9)
1. The indoor visible light communication LED optimizing layout method is characterized by comprising the following steps:
The position vector of the particle is constructed by utilizing the lamp coordinate, the velocity vector of the particle is updated by utilizing the velocity, and the variance of the received light power on the communication plane is taken as a fitness function, so that the aim of optimizing the power variation range of the receiver is achieved.
2. The method of claim 1, wherein the LED arrays are placed in a same plane and have Lambertian radiation patterns, and each LED is biased at a bias point recommended in the data table.
3. the method of claim 1, wherein each point in the VLC system is made equally important, and the user in the room should receive the same signal strength no matter where the user is;
the total number of LEDs is N, and each LED array is filled with N0A number of LED arraysthe uniformity of the received power is measured by using the variance of the light receiving power on the communication plane, and the smaller the power variance is, the higher the power uniformity is, and the LED optimization layout problem is expressed as a minimum light receiving power solving problem.
4. The indoor visible light communication LED optimal layout method of claim 1, wherein in solving, J particle swarm is initialized by random position vector and speed;
Calculating the fitness of all the particles;
Updating the velocity and position vectors of the jth particle;
Calculating the fitness of the new position vector;
the derived variance of the received optical power satisfies an optimal solution of the set condition.
5. The indoor visible light communication LED optimizing layout method of claim 1, wherein the VLC receiver receives optical signal power:
in the formula, Ptis the transmitted power of the lamp, Hd(0) Is the DC gain of the LOS channel, Href(0) Is the dc gain of the reflection channel.
6. The indoor visible light communication LED optimal layout method of claim 3, wherein the minimum light reception power:
min{D(Pr)} (2)
Wherein x is more than or equal to 01,x2,...,xN≤L,0≤y1,y2,...,yN≤W；
Where N is the number of LED lamps and L and W represent the length and width of the room, respectively. D (P)r) Is the variance of the received light power in the communication plane, and the coordinates x and y represent the horizontal and vertical coordinates of each lamp, respectively, where
D(Pr)＝E{[Pr-E(Pr)]2} (3)
The xy coordinates of the N distributed LEDs are composed of a position vector of one particle, the number of the particles is J, an initial position vector and a velocity vector of each particle are randomly generated, namely each element in the initial position vector is from DsRandomly selecting the regions;
7. The indoor visible light communication LED optimal layout method of claim 1, wherein a particle swarm algorithm updates the current position of each particle by velocity.
8. the indoor visible light communication LED optimizing layout system is characterized by comprising a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the program to realize the following steps:
The position vector of the particle is constructed by utilizing the lamp coordinate, the velocity vector of the particle is updated by utilizing the velocity, and the variance of the received light power on the communication plane is taken as a fitness function, so that the aim of optimizing the power variation range of the receiver is achieved.
9. a computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, carries out the steps of:
The position vector of the particle is constructed by utilizing the lamp coordinate, the velocity vector of the particle is updated by utilizing the velocity, and the variance of the received light power on the communication plane is taken as a fitness function, so that the aim of optimizing the power variation range of the receiver is achieved.
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