CN105007588A - Communication method based on wireless ultraviolet light - Google Patents

Abstract

The invention discloses a communication method based on wireless ultraviolet light. The method comprises the following steps: establishing an ultraviolet light network; layering the network, and classifying network nodes into a commander, a group leader, a gateway and an ordinary node; selecting an optimal communication path according to a genetic algorithm; determining ultraviolet light transmitting power according to the selected optimal communication path; and performing instant communication with a receiving node according to the transmitting power, the optimal communication path and a reception-transmission elevation angle by a transmitting node. Ultraviolet light is taken as a carrier of information transmission, so that tactical communication has the features of self-organization, self-healing, high robustness, non-line-of-sight communication, high interference resistance and the like. The wireless ultraviolet light hybrid network is large in scale and high in mobility. An accurate judgment on a most appropriate path and a most appropriate elevation angle can be made by layering of a wireless network structure, so that the communication among nodes in the same layer becomes more efficient and rapid.

Description

A kind of communication means based on wireless ultraviolet light

Technical field

The invention belongs to communication technical field, be specifically related to a kind of communication means based on wireless ultraviolet light.

Background technology

The major way of radio communication is microwave communication and satellite communication, and radio communication does not need when carrying out information transmission to pass through line media.Microwave communication transmits information signal by radio wave, and its transmission range can far reach tens of km, and the frequency band of microwave is broad, can hold bulk information, meets the user demand of more users.The coverage of microwave communication is wide, but its major way is horizon communication, need relay forwarding after exceeding sighting distance, in order to ensure the Accuracy and high efficiency of cross-region, telecommunication, a microwave relay will be built to realize microwave transmission at interval of tens kms.The coverage of satellite communication is more wide, and the distance of information transmission is longer.Satellite communication is using the communication satellite in space as microwave relay, is connected, realizes exchanges data with the Signal reception point on ground.Compare microwave communication, this communication mode of satellite communication is more easy in transfer of data.But satellite communication has intrinsic deadly defect: be subject to electronic jamming and illegally intercepted and captured.

Along with the growth of wireless communication system application, a series of new demand is promoting that production application is to more firm and System Development more flexibly, guarantees to need also can set up communication by wireless network and need not rely on land or satellite communication system between the object of communication.Current, the transportable network of node, ensures that the performance of network and the reliability communicated are regular occupations being badly in need of solving.Wireless network architecture is studied, and is one of communications platform major part in wireless network.For cordless communication network non-stop layer self-organizing, network topology dynamic change is frequent, transmission bandwidth is limited, there is the features such as one way link, needs the wireless network architecture determining a kind of applicable wireless communication network system architecture badly.

Summary of the invention

The object of this invention is to provide a kind of communication means based on wireless ultraviolet light, solve the problem that existing communication method is easily ravesdropping and wireless network non-stop layer self-organizing message transmission rate is low.

The technical solution adopted in the present invention is, a kind of communication means based on wireless ultraviolet light, specifically implements according to following steps:

Step 1, sets up ultraviolet light network;

Step 2, in the ultraviolet light network that step 1 is set up, random selecting network node is as commander, maximum Connected degree clustering algorithm is utilized to hive off to all the other nodes in network subsequently, and to its layering: network node is divided into cluster, gateway and ordinary node successively;

Step 3, selects optimal communication path by genetic algorithm;

Step 4, according to the optimal communication path of step 3 gained, determines ultraviolet light emission power;

Step 5, transmitting node carries out instant messaging according to step 4 gained ultraviolet light emission power.

Feature of the present invention is also,

In step 2, network hierarchy process is:

Step 2.1: the number of the adjacent node of all nodes in statistics network, choose and wherein there is the maximum node of adjacent node number as cluster, then select when the number of degrees are identical No. ID minimum node as cluster, calculate the communication range R of cluster by formula (1):

In formula, R is the communication range of cluster, and unit is m; P _rfor received power, unit is W; P _tfor the transmitted power of transmitting node, unit is W; A _rfor the area in receiving node aperture, unit is m ²; P _sfor Scattering Phase Function; φ ₁for launching elevation, unit is rad; φ ₂for receiving the elevation angle, unit is rad; θ ₁for the beam angle of transmitting node, unit is rad; θ ₂for the angle of visual field of receiving node, unit is rad; R is the horizontal range between transmitting node and receiving node, and unit is m; K _efor atmosphere attenuation coefficien, K _e=K _sR+ K _sM+ K _a, wherein, K _sRfor Rayleigh scattering coefficient, K _sMfor Mile scattering coefficient, K _afor atmosphere absorbance;

Step 2.2: all nodes in cluster communication range R are rank and file's node of this group, and by the mark position 1 of rank and file's node of this group, residue vertex ticks is 0;

Step 2.3: repeat step 2.1 and step 2.2, hive off to the node being labeled as 0, until nodes mark does not have 0, has now hived off;

Step 2.4: in the node after step 2.3 being hived off, the Node configuration of connection group and group is gateway node, and the layering of network terminates.

In step 3, the selection course in optimal communication path is:

Step 3.1, according to the node relationships of network on network after step 2 layering, with certain two node any in network for transmitting node and receiving node, is encoded as gene in the transmitting-receiving elevation angle of the communication path existed between them and transmitting-receiving node, produce N number of chromosome s ₁, s ₂..., s _n, each chromosome comprises 3 genes: communication path numbering, launching elevation, the reception elevation angle, composition initial population S={s ₁, s ₂..., s _n, put algebraically Gen=1;

Step 3.2, utilizes formula (2) to calculate each chromosomal fitness f (s):

$f\left(s\right)=\Σ\[l_{ij}+\frac{\sin ({\mathrm{\θ}}_i+{\mathrm{\θ}}_j)}{{\mathrm{sin\θ}}_i}\exp (-\frac{{\mathrm{sin\θ}}_i+{\mathrm{sin\θ}}_j}{\sin ({\mathrm{\θ}}_i+{\mathrm{\θ}}_j)})\]---\left(2\right)$

Step 3.3, if step 3.2 gained fitness f (s) is less than C, then the communication path numbering gene that this chromosome carries is optimal communication path; Otherwise the chromosome in population S carries out selecting, intersect, making a variation obtains population of new generation; Wherein, C is the constant drawn according to communications cost and communicating requirement;

Step 3.4, utilizes chromosomal fitness in formula (2) calculation procedure 3.3 gained a new generation population, repeats the method for step 3.3, until obtain optimal communication path.

In step 4, the computational process of ultraviolet light emission power is: the transmitting power by formula (3) calculation procedure 3 gained optimal communication outlet openings node:

In formula, P _tfor the transmitted power of transmitting node, unit is W; P _rfor received power, unit is W; A _rfor the area in receiving node aperture, unit is m ²; P _sfor Scattering Phase Function; φ ₁for launching elevation, unit is rad; φ ₂for receiving the elevation angle, unit is rad; θ ₁for the beam angle of transmitting node, unit is rad; θ ₂for the angle of visual field of receiving node, unit is rad; R is the horizontal range between transmitting node and receiving node, and unit is m; K _efor atmosphere attenuation coefficien, K _e=K _sR+ K _sM+ K _a, wherein K _sRfor Rayleigh scattering coefficient, K _sMfor Mile scattering coefficient, K _afor atmosphere absorbance.

The invention has the beneficial effects as follows,

1. the present invention is using ultraviolet light as the carrier of transmission information, radio communication the is provided with characteristic such as self-organizing, self-healing, high robustness, non-direct-view communication, antijamming capability be strong.

2. in the present invention, large, the mobility of wireless ultraviolet light hybrid network scale is strong, by carrying out layering to this wireless network architecture, accurately can judge which paths, the great transmitting-receiving elevation angle are most suitable, thus makes the communication between same node layer become more efficient, rapidly.

Accompanying drawing explanation

Fig. 1 is the present invention's wireless ultraviolet light network hierarchy Path selection flow chart;

Fig. 2 is wireless ultraviolet light network hierarchy schematic network structure in the embodiment of the present invention;

Fig. 3 is the single scattering model figure of wireless ultraviolet light network when non line-of-sight communication in the embodiment of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.

A kind of communication means based on wireless ultraviolet light of the present invention, the present invention is wireless ultraviolet light network hierarchy Path selection flow chart is as shown in Figure 1; Specifically implement according to following steps:

Step 1, sets up ultraviolet light network;

Step 2, in the ultraviolet light network that step 1 is set up, random selecting network node is as commander, utilizes maximum Connected degree clustering algorithm to hive off to all the other nodes in network subsequently, and to its layering:

Step 2.1: the number of the adjacent node of all nodes in statistics network, choose wherein there is topnotch number node as cluster, then select when the number of degrees are identical No. ID minimum node as cluster, calculate the communication range R of cluster by formula (1):

In formula, R is the communication range of cluster, and unit is m; P _rfor received power, unit is W; P _tfor the transmitted power of transmitting node, unit is W; A _rfor the area in receiving node aperture, unit is m ²; P _sfor Scattering Phase Function; φ ₁for launching elevation, unit is rad; φ ₂for receiving the elevation angle, unit is rad; θ ₁for the beam angle of transmitting node, unit is rad; θ ₂for the angle of visual field of receiving node, unit is rad; R is the horizontal range between transmitting node and receiving node, and unit is m; K _efor atmosphere attenuation coefficien, K _e=K _sR+ K _sM+ K _a, wherein, K _sRfor Rayleigh scattering coefficient, K _sMfor Mile scattering coefficient, K _afor atmosphere absorbance;

Step 2.2: all nodes in cluster communication range R are rank and file's node of this group, and by the mark position 1 of rank and file's node of this group, residue vertex ticks is 0;

Step 2.3: repeat step 2.1 and step 2.2, hive off to the node being labeled as 0, until nodes mark does not have 0, has now hived off;

Step 2.4: in the node after step 2.3 being hived off, the Node configuration of connection group and group is gateway node, and the layering of network terminates.

Step 3, select optimal communication path by genetic algorithm:

Step 3.1, according to the node relationships of network on network after step 2 layering, with certain two node any in network for transmitting node and receiving node, is encoded as gene in the transmitting-receiving elevation angle of the communication path existed between them and transmitting-receiving node, produce N number of chromosome s ₁, s ₂..., s _n, each chromosome comprises 3 genes: communication path numbering, launching elevation, the reception elevation angle, composition initial population S={s ₁, s ₂..., s _n, put algebraically Gen=1;

Step 3.2, utilizes formula (2) to calculate each chromosomal fitness f (s):

$f\left(s\right)=\Σ\[l_{ij}+\frac{\sin ({\mathrm{\θ}}_i+{\mathrm{\θ}}_j)}{{\mathrm{sin\θ}}_i}\exp (-\frac{{\mathrm{sin\θ}}_i+{\mathrm{sin\θ}}_j}{\sin ({\mathrm{\θ}}_i+{\mathrm{\θ}}_j)})\]---\left(2\right)$

In formula, f (s) is chromosomal fitness, l _ijbe the bandwidth resources between node i and node j, unit is B; θ _ibe the launching elevation of node i, unit is rad, θ _jthe reception elevation angle of node j, unit is rad;

Step 3.3, if step 3.2 gained fitness f (s) is less than C, then the communication path numbering gene that this chromosome carries is optimal communication path; Otherwise the chromosome in population S carries out selecting, intersect, making a variation obtains population of new generation; Wherein, C is the constant drawn according to communications cost and communicating requirement;

Step 3.4, utilizes chromosomal fitness in formula (2) calculation procedure 3.3 gained a new generation population, repeats the method for step 3.3, until obtain optimal communication path.

Step 4, according to the optimal communication path of step 3 gained, determine ultraviolet light emission power:

Transmitting power by formula (3) calculation procedure 3 gained optimal communication outlet openings node:

In formula, P _tfor the transmitted power of transmitting node, unit is W; P _rfor received power, unit is W; A _rfor the area in receiving node aperture, unit is m ²; P _sfor Scattering Phase Function; φ ₁for launching elevation, unit is rad; φ ₂for receiving the elevation angle, unit is rad; θ ₁for the beam angle of transmitting node, unit is rad; θ ₂for the angle of visual field of receiving node, unit is rad; R is the horizontal range between transmitting node and receiving node, and unit is m; K _efor atmosphere attenuation coefficien, K _e=K _sR+ K _sM+ K _a, wherein K _sRfor Rayleigh scattering coefficient, K _sMfor Mile scattering coefficient, K _afor atmosphere absorbance.

Step 5, transmitting node carries out instant messaging according to step 4 gained ultraviolet light emission power.

Embodiment

C3 in the network created for Fig. 2, illustrates the embodiment of the communication means that the present invention is based on wireless ultraviolet light:

1) node 0 in specified network is commander.

2) in remaining node, find out the maximum node Isosorbide-5-Nitrae of the node number of degrees successively, 8 are set to cluster, determine the ordinary node in group according to its communication range, as the ordinary node in group C3 has: 7,11,9,10; Divide all nodes in this network successively, the node of connection group and group is gateway node, and the gateway node of this network is 2,3,5,6; Concrete layering result as shown in Figure 2.

3) in the network after layering for 7 be source node, node for the purpose of 10,12 chromosomes produced after carrying out gene code in U obtain population S={s ₁, s ₂..., s _n, specific as follows.Meanwhile, algebraically Gen=1 is put.

s ₁：7 8 6 11 9 10；

s ₂：7 8 9 10；

s ₃：7 8 10； 0；0

s ₄：7 8 11 9 10；

s ₅：7 11 8 9 10；

s ₆：7 11 9 10；

s ₇：7 6 8 9 10；

s ₈：7 6 8 10；

s ₉：7 11 8 10；

s ₁₀：7 6 8 11 9 10；

s ₁₁：7 6 11 8 9 10；

s ₁₂：7 6 11 9 10；

Bandwidth resources l between C3 group's interior nodes _ijfor:

Node#

6

7

8

9

10

11

6	0	25	30	∞	∞	12
							7	25	0	14	∞	∞	32
8	30	14	0	15	18	28
							9	∞	∞	15	0	45	34
10	∞	∞	18	45	0	∞
							11	12	32	28	34	∞	0

4 chromosome s are selected above from the population obtained ₂, s ₅, s ₈, s ₁₂as initial population, the fitness utilizing formula (2) to calculate this population is f (s), wherein, and s ₁fitness be:

$\begin{array}{c}f\left(s_1\right)=\Σ\[l_{ij}+\frac{\sin ({\mathrm{\θ}}_i+{\mathrm{\θ}}_j)}{{\mathrm{sin\θ}}_i}\exp (-\frac{{\mathrm{sin\θ}}_i+{\mathrm{sin\θ}}_j}{\sin ({\mathrm{\θ}}_i+{\mathrm{\θ}}_j)})\]\\ =14+\frac{\sin (\frac{5\mathrm{\π}}{36}+\frac{\mathrm{\π}}{4})}{\sin \frac{5\mathrm{\π}}{36}}\exp (-\frac{\sin \frac{5\mathrm{\π}}{36}+\sin \frac{\mathrm{\π}}{4}}{\sin (\frac{5\mathrm{\π}}{36}+\frac{\mathrm{\π}}{4})})+30+\frac{\sin (\frac{\mathrm{\π}}{9}+\frac{\mathrm{\π}}{6})}{\sin \frac{\mathrm{\π}}{9}}\exp (-\frac{\sin \frac{\mathrm{\π}}{9}+\sin \frac{\mathrm{\π}}{6}}{\sin (\frac{\mathrm{\π}}{9}+\frac{\mathrm{\π}}{6})})\\ +12+\frac{\sin (\frac{2\mathrm{\π}}{9}+\frac{\mathrm{\π}}{3})}{\sin \frac{2\mathrm{\π}}{9}}\exp (-\frac{\sin \frac{2\mathrm{\π}}{9}+\sin \frac{\mathrm{\π}}{3}}{\sin (\frac{2\mathrm{\π}}{9}+\frac{\mathrm{\π}}{3})})+34+\frac{\sin (\frac{4\mathrm{\π}}{9}+\frac{\mathrm{\π}}{6})}{\sin \frac{4\mathrm{\π}}{9}}\exp (-\frac{\sin \frac{4\mathrm{\π}}{9}+\sin \frac{\mathrm{\π}}{6}}{\sin (\frac{4\mathrm{\π}}{9}+\frac{\mathrm{\π}}{6})})\\ +45+\frac{\sin (\frac{\mathrm{\π}}{2}+\frac{\mathrm{\π}}{12})}{\sin \frac{\mathrm{\π}}{2}}\exp (-\frac{\sin \frac{\mathrm{\π}}{2}+\sin \frac{\mathrm{\π}}{12}}{\sin (\frac{\mathrm{\π}}{2}+\frac{\mathrm{\π}}{12})})\\ =127.3455\end{array}$

In like manner calculate s successively ₅, s ₈, s ₁₂fitness, subsequently the f (s) obtained is compared with C successively, C=40 is chosen according to communications cost and requirement, because f (s)=127.3455 are greater than C, then the communication path numbering gene that carries of this chromosome can not be optimal communication path, carries out selecting, intersects, making a variation obtains population of new generation with a chromosomal gene pairs chromosome:

(1) selection opertor and population S obtain new colony S ₁:

Individual numbering	Initial population	Fitness value	Account for total percentage	Select number of times	Selection result
						1	7 8 9 10	135	0.30	0	76810
2	7 11 8 9 10	120	0.27	1	7118910
						3	7 6 8 10	73	0.16	2	7118910
4	7 6 11 9 10	116	0.27	1	7611910
						Summation		444	1

(2) crossover operator and population S ₁obtain new colony S ₂:

(3) mutation operator and population S ₂obtain new colony S ₃:

By colony S ₃as new population, namely use S ₃replace S, Gen=Gen+1, judge whether there is optimum dyeing body in current population or select the algebraically Gen of cross and variation to reach 10, then the chromosome that in S, fitness is minimum is as required result.

Individual numbering	Progeny population	Fitness value	Account for the percentage of sum
				1	7 8 9 10	74	0.29
2	7 8 10	32	0.12
				3	7 6 8 10	73	0.28
4	7 11 8 10	78	0.31
				Summation		257	1

As can be seen from the above table, colony is after a generation is evolved, and the minimum value of its fitness, mean value are obtained for obvious improvement.In fact, have found optimized individual " 7810 " here.Namely 7 is transmitting node, and 10 is receiving node, and the path of bandwidth resources optimum is: $(7,\frac{\mathrm{\π}}{3},0)\→(8,\frac{\mathrm{\π}}{4},\frac{\mathrm{\π}}{3})\→(10,0,\frac{3\mathrm{\π}}{10}).$

4) calculated by the transmitting power P of node 7 by formula (3) _t, ultraviolet light non-direct-view scattering,single traffic model as shown in Figure 3.

5) node 7 transmitting power P is launched _t, with node path instant messaging is completed with receiving node 10.

Communication means based on wireless ultraviolet light of the present invention, solves the current poor expandability of wireless network centralized configuration, the problem of poor mobility, and accurately can judge that road the best, improves the anti-interference of radio communication greatly simultaneously.

Claims (4)

1. based on a communication means for wireless ultraviolet light, it is characterized in that, specifically implement according to following steps:

Step 1, sets up ultraviolet light network;

Step 2, in the ultraviolet light network that step 1 is set up, random selecting network node is as commander, maximum Connected degree clustering algorithm is utilized to hive off to all the other nodes in network subsequently, and to its layering: network node is divided into cluster, gateway and ordinary node successively;

Step 3, selects optimal communication path by genetic algorithm;

Step 4, according to the optimal communication path of step 3 gained, determines ultraviolet light emission power;

Step 5, transmitting node carries out instant messaging according to step 4 gained ultraviolet light emission power.

2. a kind of communication means based on wireless ultraviolet light according to claim 1, is characterized in that, in step 2, network hierarchy process is:

Step 2.1: the number of the adjacent node of all nodes in statistics network, choose wherein there is topnotch number node as cluster, then select when the number of degrees are identical No. ID minimum node as cluster, calculate the communication range r of cluster by formula (1):

In formula, R is the communication range of cluster, and unit is m; P _rfor the received power of receiving node, unit is W; P _tfor the transmitted power of transmitting node, unit is W; A _rfor the area in receiving node aperture, unit is m ²; P _sfor Scattering Phase Function; φ ₁for launching elevation, unit is rad; φ ₂for receiving the elevation angle, unit is rad; θ ₁for the beam angle of transmitting node, unit is rad; θ ₂for the angle of visual field of receiving node, unit is rad; R is the horizontal range between transmitting node and receiving node, and unit is m; K _efor atmosphere attenuation coefficien, K _e=K _sR+ K _sM+ K _a, wherein, K _sRfor Rayleigh scattering coefficient, K _sMfor Mile scattering coefficient, K _afor atmosphere absorbance;

Step 2.2: all nodes in cluster communication range R are rank and file's node of this group, and by the mark position 1 of rank and file's node of this group, residue vertex ticks is 0;

Step 2.3: repeat step 2.1 and step 2.2, hive off to the node being labeled as 0, until nodes mark does not have 0, has now hived off;

Step 2.4: in the node after step 2.3 being hived off, the Node configuration of connection group and group is gateway node, and the layering of network terminates.

3. a kind of communication means based on wireless ultraviolet light according to claim 1, is characterized in that, in step 3, the selection course in optimal communication path is:

Step 3.1, according to the node relationships of network on network after step 2 layering, with certain two node any in network for transmitting node and receiving node, is encoded as gene in the transmitting-receiving elevation angle of the communication path existed between them and transmitting-receiving node, produce N number of chromosome s ₁, s ₂..., s _n, each chromosome comprises 3 genes: communication path numbering, launching elevation, the reception elevation angle, composition initial population S={s ₁, s ₂..., s _n, put algebraically Gen=1;

Step 3.2, utilizes formula (2) to calculate each chromosomal fitness f (s):

$f\left(s\right)=\mathrm{\Σ}\[l_{ij}+\frac{sin({\mathrm{\θ}}_i+{\mathrm{\θ}}_j)}{{\mathrm{sin\θ}}_i}\exp (-\frac{{\mathrm{sin\θ}}_i+{\mathrm{sin\θ}}_j}{sin({\mathrm{\θ}}_i+{\mathrm{\θ}}_j)})\]---\left(2\right)$

Step 3.3, if step 3.2 gained fitness f (s) is less than C, then the communication path numbering gene that this chromosome carries is optimal communication path; Otherwise the chromosome in population S carries out selecting, intersect, making a variation obtains population of new generation; Wherein, C is the constant drawn according to communications cost and communicating requirement;

Step 3.4, utilizes chromosomal fitness in formula (2) calculation procedure 3.3 gained a new generation population, repeats the method for step 3.3, until obtain optimal communication path.

4. a kind of communication means based on wireless ultraviolet light according to claim 1, it is characterized in that, in step 4, the computational process of ultraviolet light emission power is: the transmitting power by formula (3) calculation procedure 3 gained optimal communication outlet openings node:

In formula, P _tfor the transmitted power of transmitting node, unit is W; P _rfor received power, unit is W; A _rfor the area in receiving node aperture, unit is m ²; P _sfor Scattering Phase Function; φ ₁for launching elevation, unit is rad; φ ₂for receiving the elevation angle, unit is rad; θ ₁for the beam angle of transmitting node, unit is rad; θ ₂for the angle of visual field of receiving node, unit is rad; R is the horizontal range between transmitting node and receiving node, and unit is m; K _efor atmosphere attenuation coefficien, K _e=K _sR+ K _sM+ K _a, wherein K _sRfor Rayleigh scattering coefficient, K _sMfor Mile scattering coefficient, K _afor atmosphere absorbance.