CN104539362B - Visible light communication system received power optimizing method based on genetic algorithm - Google Patents
Visible light communication system received power optimizing method based on genetic algorithm Download PDFInfo
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Abstract
The invention discloses a visible light communication system received power optimizing method based on a genetic algorithm. The visible light communication system received power optimizing method includes the steps that firstly, a receiving plane composed of receivers of a visible light communication system is divided into a plurality of areas, wherein optical collectors with the same light transmittance are adopted for the receivers in each area; then the light transmittance of the multiple areas serves as genes to obtain bodies, a fitness objective function is set, an optimal light transmittance combination is obtained with the genetic algorithm, after the genetic algorithm is repeated a plurality of times, the obtained optimal light transmittance combinations are averaged, and the final light transmittance combination result is obtained. By means of the visible light communication system received power optimizing method, the evenness of the received power in the visible light communication system can be effectively improved, and the visible light communication system received power optimizing method is simple and practicable; in addition, adjustment and control are carried out at the receiving end, the power at the transmitting end can not be influenced, and therefore the indoor lighting level and the transmission delay can not be influenced.
Description
Technical field
The invention belongs to visible light communication system technical field, more specifically, be related to a kind of based on genetic algorithm
Visible light communication system receiving power optimization method.
Background technology
Based on the indoor visible light communication technology of LED, increasingly paid close attention to by academia.LED has
A lot of advantages, such as high, low, environment friendly of long service life, energy consumption of radiation efficiency etc..Compare with traditional light source,
LED can provide communication simultaneously and illuminate.However, because the mirror-reflection effect of indoor minute surface ceiling etc. is it is seen that optic communication
The Multipath Transmission of system is inevitable.It is not that Multipath Transmission can lead to the power that the receiver positioned at diverse location receives
Equally distributed, that is, the reception function being located at room center receives more power than the receiver positioned at corner.
In order to reduce the impact of uneven Power coverage, it is also proposed certain methods at present, mainly lay stress on control
On LED beam and LED array distribution.Such as Jupeng Ding etc. is published in Journal of the Optical Society
of America A,2012,29(6):971-979.'s is entitled《Evolutionary Algorithm Based Uniform
Received Power&Illumination Rendering for Indoor Visible Light Communication》
Paper propose and reach the purpose of optimization with the transmission power that evolvement method optimizes transmitting terminal LED array, however, these sides
Method not only reduces illumination level, also add the root mean square delay spread of transmission simultaneously.Additionally, T.Komine etc. is published in
Wireless Communications, IEEE Transactions, 2009,8 (6), 2892-2900's is entitled
《Adaptive equalization system for visible light wireless communication
utilizing multiple white LED lighting equipment》Paper propose based on adaptive equalization skill
The prioritization scheme of art, but adaptive equalization technique implements sufficiently complex, and cost is also high.Therefore, do not affecting illumination level
On the premise of root mean square time delay, the optimization quickly and easily realizing the distribution of visible light communication receiving power is critically important.
Content of the invention
It is an object of the invention to overcoming the deficiencies in the prior art, provide a kind of visible light communication system based on genetic algorithm
System receiving power optimization method, quickly and easily realizes the optimization of receiving power distribution in visible light communication system, improves and receive
The uniformity of power.
For achieving the above object, the visible light communication system receiving power optimization side based on genetic algorithm for the present invention
Method, comprises the following steps：
S1：It will be seen that the receiving plane of the receiver composition of optical communication system is divided into M region, connecing in each region
Receipts machine adopts light transmittance identical concentrator, and the light transmittance of m-th region concentrator is designated as lm, the span of m is m=1,
2,…,M；
S2：Setting genetic algorithm execution total degree K, carries out K genetic algorithm, the concrete steps bag of each genetic algorithm
Include：
S2.1：By M light transmittance lmAs M gene, form individual L=(l1,l2,…,lM), randomly generate N number of
One initial population of individual composition；
S2.2：Set the object function of the individual adaptation degree based on receiving power, setting principle is：Receiving power distribution is got over
Uniformly, fitness is higher；
S2.3：Calculate the receiving power of each individual corresponding all receiver in population, and calculated according to receiving power
Each individual fitness value；
S2.4：Judging whether to reach default genetic algorithm end condition, if it is not, entering step S2.5, otherwise entering
Enter step 2.6；
S2.5：Enter the selection in line algorithm according to fitness value, intersection, the operation of variation obtain progeny population, return step
Rapid S2.3；
S2.6：Filter out the maximum individuality of a fitness value as optimum light transmittance group in last generation progeny population
Close Lk=(l1,k,l2,k,…,lM,k)；
S3：The optimum light transmittance combination L that K genetic algorithm is obtainedk=(l1,k,l2,k,…,lM,k) carry out averagely, obtaining
The final result of light transmittance combinationBy this light transmittance combination application in visible light communication system.
The visible light communication system receiving power optimization method based on genetic algorithm for the present invention, first it will be seen that optic communication system
The receiving plane of the receiver composition of system is divided into several regions, and the receiver in each region adopts light transmittance identical to gather
Then the light transmittance in this several region is obtained an individual, the object function of setting fitness as gene, adopts by light device
Genetic algorithm obtains optimum light transmittance combination, after repeated several times genetic algorithm, the optimum light transmittance combination obtaining is put down
All, obtain final light transmittance combined result.Receiving power in visible light communication system can be effectively improved using the present invention
Uniformity, and simple, and the present invention is to be regulated and controled in receiving terminal, and transmitting terminal power will not be impacted,
Therefore also indoor illumination level and propagation delay time will not be impacted.
Brief description
Fig. 1 is the specific embodiment based on the visible light communication system receiving power optimization method of genetic algorithm for the present invention
Flow chart；
Fig. 2 is the receiving plane schematic diagram of the present embodiment；
Fig. 3 is the LED transmitter configuration figure of the present embodiment；
Fig. 4 is that the receiving plane in the present embodiment divides schematic diagram；
Fig. 5 is the receiving power distribution map being provided without receiving power optimization method；
Fig. 6 is the receiving power distribution map using receiving power optimization method of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described, so that those skilled in the art is preferably
Understand the present invention.Requiring particular attention is that, in the following description, when known function and design detailed description perhaps
Can desalinate the present invention main contents when, these descriptions will be ignored here.
Embodiment
Fig. 1 is the specific embodiment based on the visible light communication system receiving power optimization method of genetic algorithm for the present invention
Flow chart.As shown in figure 1, the present invention includes following step based on the visible light communication system receiving power optimization method of genetic algorithm
Suddenly：
S101：Receiving plane divides：
It will be seen that the receiving plane of the receiver composition of optical communication system is divided into M region, the reception in each region
Machine adopts light transmittance identical concentrator, and the light transmittance of m-th region concentrator is designated as lm, the span of m is m=1,
2,…,M.
Fig. 2 is the receiving plane schematic diagram of the present embodiment.As shown in Fig. 25 meters of the length in room in the present embodiment, wide 5 meters,
High 3 meters, it is entirely empty, without any jamming light source with block.It is evenly distributed 25 × 25=625 receiver on ground, connect
The face that is closed flat is located at 0.85 meter of ground.Fig. 3 is the LED transmitter configuration figure of the present embodiment.As shown in figure 3, the present embodiment
In amount to 3 × 3=9 LED transmitter array, be uniformly distributed on the ceiling, in each LED transmitter array, comprise 7 × 7=
49 LED transmitter.Fig. 4 is that the receiving plane in the present embodiment divides schematic diagram.As shown in figure 4, receiving flat in the present embodiment
Face is divided into 5 × 5=25 region, has 25 receivers in each region, the light transmittance of the concentrator that each receiver uses
All same.Then amount to 25 light transmittances in the present embodiment.In practical application, the region division of receiving plane is not necessarily uniformly, can
Divided with the actual conditions according to environment.
S102：Setting genetic algorithm execution total degree K.K=20 is set in the present embodiment.
S103：Make k=1.
S104：Generate the initial population of kth time genetic algorithm：
By M light transmittance lmAs M gene, form individual L=(l1,l2,…,lM), randomly generate individuality
One initial population of composition.
S105：Set the object function of the individual adaptation degree based on receiving power, setting principle is：Receiving power distribution is got over
Uniformly, fitness is higher.In the present embodiment, the object function of the fitness of employing is：
Wherein, maxPr(Lv) and minPr(Lv) represent respectively for a specific light transmittance combination individuality Lv, entirely connect
It is closed flat the maxima and minima in all receiver receiving powers in face.The maxima and minima difference of receiving power is got over
Little, fitness is bigger.
Object function can be selected according to actual conditions, for example, can also build fitness target letter using variance
Number.
S106：Calculate the receiving power of each individual corresponding all receiver in population.In the present embodiment, receiving power
Computing formula：
Wherein, SiRepresent i-th emitter, i=1,2 ..., I, I represent the number of LED transmitter in visible light communication system
Amount, RjRepresent j-th receiver, j=1,2 ..., J, J represent the quantity of receiver in visible light communication system, PtRepresent each
The transmission power of LED transmitter, H(0)(0；Si,Rj) it is the direct projection gain to j-th receiver of i-th emitter, Href(0；Si,
Rj) represent reflection gain, AsurRepresent plane of reflection area, njRepresent the light transmittance of the concentrator of j-th receiver, ψcRepresent every
The angle of visibility FOV (angle of visibility) of individual receiver.
In visible light communication system, the computational methods of receiving power may refer to Fundeamental Analysis for
Visible-Light Communication System using LED Lights(Toshihiko Komine,and
Masao Nakagawa).
S107：Each individual fitness value is calculated according to receiving power.
S108：Judging whether to reach default genetic algorithm end condition, if it is not, entering step S109, otherwise entering
Enter step S110.Genetic algorithm end condition is configured according to actual needs, generally has two ways, and one kind is that setting adapts to
The threshold value of angle value, then terminates when fitness value reaches threshold value；Also have a kind of be setting progeny population maximum algebraically, when reaching
Advanced algebra then terminates.
S109：Enter the selection in line algorithm according to fitness value, intersection, the operation of variation obtain progeny population, return step
Rapid S106.
S110：Filter out the maximum individuality of a fitness value as optimum light transmittance group in last generation progeny population
Close Lk=(l1,k,l2,k,…,lM,k), enter step S111.
Genetic algorithm is a kind of conventional ripe algorithm at present, its principle and select, intersect, the operation here of variation no longer
Repeat.
S111：Judging whether k ＜ K, if it is, entering step S112, otherwise entering step S113.
S112：Make k=k+1, return to step S104.
S113：By K optimum light transmittance combination Lk=(l1,k,l2,k,…,lM,k) carry out averagely, obtaining light transmittance combination
Final resultComputing formula is：
Why carried out using the optimum light transmittance combination that K genetic algorithm obtains average, be because that genetic algorithm exists
Certain randomness, using the impact that averagely can reduce this randomness.
According to step of the present invention, embodiment illustrated in fig. 2 is emulated, the optimum that 20 genetic algorithms are obtained
Light transmittance combination average, obtains final result.25 light transmittances in light transmittance combination in the present embodiment are followed successively by 1.9,1.8,
1.7,1.7,1.9,1.8,1.6,1.5,1.6,1.8,1.7,1.6,1.7,1.7,1.7,1.7,1.7,1.6,1.7,1.7,2.0,
1.8,1.7,1.9,1.9.In all receivers, receiving power maximum is 2.9 μ W, and minimum of a value is 1.4 μ W.
Fig. 5 is the receiving power distribution map being provided without receiving power optimization method.Fig. 6 is excellent using receiving power of the present invention
The receiving power distribution map of change method.Contrast Fig. 5 and Fig. 6 understands, when not adopting receiving power optimization method, the present embodiment
In room, receiving power is distributed with room center as maximum, successively decreases to outer, and maximum and minimum of a value differ greatly；When adopting
Carry out after receiving power optimization with receiving power optimization method of the present invention, the announcement of receiving power is more uniform, especially room
The power that accepts of corner is greatly improved.It can be seen that, combined using the light transmittance that the present invention obtains, can effectively improve visible
The uniformity of receiving power in optical communication system.
Although to the present invention, illustrative specific embodiment is described above, in order to the technology of the art
Personnel understand the present invention, the common skill it should be apparent that the invention is not restricted to the scope of specific embodiment, to the art
For art personnel, as long as various change is in the spirit and scope of the present invention of appended claim restriction and determination, these
Change is it will be apparent that all utilize the innovation and creation of present inventive concept all in the row of protection.
Claims (2)
1. a kind of visible light communication system receiving power optimization method based on genetic algorithm is it is characterised in that include following walking
Suddenly：
S1：It will be seen that the receiving plane of the receiver composition of optical communication system is divided into M region, the receiver in each region
Using light transmittance identical concentrator, the light transmittance of m-th region concentrator is designated as lm, the span of m is m=1,2 ...,
M；
S2：Setting genetic algorithm execution total degree K, carries out K genetic algorithm, the concrete steps of each genetic algorithm include：
S2.1：By M light transmittance lmAs M gene, form individual L=(l1,l2,…,lM), randomly generate individuality
One initial population of composition；
S2.2：Set the object function of the individual adaptation degree based on receiving power, setting principle is：Receiving power distribution is more equal
Even, fitness is higher；
S2.3：Calculate the receiving power of each individual corresponding all receiver in population, and each is calculated according to receiving power
Individual fitness value；
S2.4：Judging whether to reach default genetic algorithm end condition, if it is not, entering step S2.5, otherwise entering step
Rapid 2.6；
S2.5：Entered according to fitness value the selection in line algorithm, intersection, variation operation obtain progeny population, return to step
S2.3；
S2.6：Filter out the maximum individuality of a fitness value and combine L as optimum light transmittance in last generation progeny populationk
=(l1,k,l2,k,…,lM,k)；
S3：The optimum light transmittance combination L that K genetic algorithm is obtainedk=(l1,k,l2,k,…,lM,k) carry out averagely, obtaining printing opacity
The final result of rate combinationBy this light transmittance combination application in visible light communication system.
2. visible light communication system receiving power optimization method according to claim 1 is it is characterised in that described individuality is suitable
The object function of response is：
Wherein, maxPr(Lv) and minPr(Lv) represent respectively for a specific light transmittance combination individuality Lv, entirely receive flat
Maxima and minima in all receiver receiving powers in face.
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| CN105634593B (en) * | 2015-12-18 | 2018-05-04 | 重庆邮电大学 | A kind of indoor visible light communication LED array layout optimization method based on genetic algorithm |
| CN106444406A (en) * | 2016-10-25 | 2017-02-22 | 彭云 | Intelligent control system and network device |
| CN108365891B (en) * | 2018-02-09 | 2020-09-01 | 重庆邮电大学 | Method for optimizing downlink coverage uniformity of indoor visible light communication system |
| CN113395113B (en) * | 2021-06-11 | 2022-07-26 | 桂林电子科技大学 | Differential demodulation method based on color shift keying |
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