CN109951229A - A kind of method of information and energy common transport in visible light communication system - Google Patents

A kind of method of information and energy common transport in visible light communication system Download PDF

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Publication number
CN109951229A
CN109951229A CN201910151387.3A CN201910151387A CN109951229A CN 109951229 A CN109951229 A CN 109951229A CN 201910151387 A CN201910151387 A CN 201910151387A CN 109951229 A CN109951229 A CN 109951229A
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China
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point
solar panel
light emitting
emitting diode
power
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CN201910151387.3A
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马帅
张凡
赵雨薇
李世银
杜淳
贺阳
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中国矿业大学
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Abstract

The embodiment of the present application discloses a kind of method of information and energy common transport in visible light communication system.It include: to establish point-to-point SLIPT VLC system, point-to-point transmission signal is converted to visible light by a light emitting diode and is sent to point-to-point receiving end by point-to-point transmitting terminal;Point-to-point receiving end will be seen that light carries out point-to-point information reception by photodiode, or carry out point-to-point collection of energy by solar panel.Using preceding method, can be realized while to three Key Performance Indicators of SLIPT VLC system: illumination, information transmission and collection of energy are analyzed.

Description

A kind of method of information and energy common transport in visible light communication system

Technical field

This application involves visible light communication field more particularly to a kind of visible light communication (visible light Communication, VLC) information and energy common transport (simultaneous lightwave information in system And power transfer, SLIPT) method.

Background technique

The explosive of wireless device increases and the growing of demand to high-speed data service gives traditional wireless communication net Network brings huge pressure, the including but not limited to quick damage of radio spectrum (radio frequency, RF) crisis and battery Consumption.To solve this problem, it is seen that information and energy in optic communication (visible light Communication, VLC) system The technology of common transport (simultaneous lightwave information and power transfer, SLIPT) with Its is huge exempt to authorize frequency spectrum, without electromagnetic interference, inherent safety is good the features such as it is promising as one of indoor wireless networks Technology.From the perspective of application, using VLC system, that is, SLIPT VLC system of SLIPT technology, has while photograph being provided The advantages of bright, information transmission and collection of energy.More specifically, the transmitting terminal of SLIPT VLC system shining using low cost Diode (light emitting diodes, LEDs) carries out broadcast biography in the case where certain illumination is required in the form of visible light Defeated, the receiving end of SLIPT VLC system is received using photodiode (photo diode, photodiode).In addition, In order to extend battery life, receiver can collect energy from light wave.Therefore, SLIPT VLC system can be in office, purchase Under the several scenes such as object center, airport, hospital, aircraft cabin with various indoor Internet of Things (Internet ofthings, IoT) It cooperates.

In recent years, people study SLIPT VLC system.In a first aspect, people using solar panel into Row synchronizing information receives and collection of energy, devises a kind of light wireless communication system, this system provides solar panels DC Model and AC model.And it using direct current biasing, visual field (field-of-view, FOV) and energy harvesting time, mentions Go out using a kind of SLIPT strategy to analyze between the energy of collection and service quality (quality of service, QoS) Balance.Alternatively, the energy acquisition VLC system under having studied different illumination conditions.On the other hand, people using photodiode into Row information receives and collection of energy.For example, the secrecy outage probability of research mixing very low frequency radio frequency network.And in double jump (dual-hop) in the rate maximization scheme of VLC/RF network, relaying obtains energy from VLC link by photodiode, so Afterwards by data retransmission to RF link.

Although signal processing of the SLIPT in RF communication system has obtained extensive analysis, since it has obviously The characteristics of, result is not directly applicable SLIPT VLC system.One of main restricting factor is being averaged for VLC system Optical power and peak optical powers must assure that the actual illumination under reasonable energy consumption.In addition, by intensity modulated and directly Detection modulation technique is connect, the signal of VLC system is non-negative real signal.The capacity of VLC channel, which is realized, on limited point set divides Cloth is discrete, and true capacity is not closed expression.In addition, the classical radio frequency Shannon for inputting distribution with Gauss (Shannon) capacity can not accurate evaluation VLC system throughput performance, therefore, the prior art use only considers average light The lower bound of the VLC channel capacity of power constraint.Generally speaking, SLIPT VLC systematic research is obtained very well not yet at present Discussion, three Key Performance Indicators can not be analyzed simultaneously: illumination, information transmission and collection of energy.

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Summary of the invention

This application provides a kind of methods of information and energy common transport in visible light communication system, to solve existing skill The three crucial performance indicators that can not analyze SLIPT VLC system simultaneously of art: illumination, information transmission and collection of energy this Problem.

In a first aspect, the application provides a kind of method of information and energy common transport in visible light communication system, comprising:

Step 1: establishing point-to-point SLIPT VLC system, the point-to-point SLIPT VLC system includes point-to-point transmitting terminal With point-to-point receiving end, the point-to-point transmitting terminal is converted to point-to-point transmission signal by a light emitting diode visible Light, and it is sent to the point-to-point receiving end;

The visible light is carried out point-to-point information reception by photodiode by the point-to-point receiving end, or by institute It states visible light and point-to-point collection of energy is carried out by solar panel.

With reference to first aspect, in one implementation, the step 1, comprising:

Step 1.1: calculate the point-to-point transmission signal x:

Enable s indicate continuous data symbol andRandom real number;

The peak amplitude of s is-A≤s≤A, and the variance of s isWherein A > 0, ε > 0;

The point-to-point transmission signal x are as follows:

Wherein, g is the power gain of power amplifier, IDFor direct current biasing;

The power gain g of the power amplifier should meet:

The average electrical power of the point-to-point transmission signal xAre as follows:

The luminous flux phi of the light emitting diodeOTAre as follows:

ΦOT=354.286x+27, (4).

With reference to first aspect, in one implementation, the step 1, comprising:

Step 1.2: according to the point-to-point transmission signal x, analyzing the illumination control of the point-to-point SLIPT VLC system System:

The light control of the point-to-point SLIPT VLC, the i.e. average light of illumination level τ, point-to-point SLIPT VLC system PowerWith maximum luminous power PTBetween relationship:

0 τ≤1 <;

According to formula (1), the average light power of the point-to-point SLIPT VLC systemBy the direct current biasing IDIt determines, I.e.

The power gain g of the power amplifier meets:

Wherein, IHFor light emitting diode maximum allowed current, i.e.,

With reference to first aspect, in one implementation, the step 1, comprising:

Step 1.3.1: the point-to-point information receiving module of the analysis point-to-point receiving end:

LoS link gain h between the light emitting diode and the photodiode1Are as follows:

Wherein,For lambert's index, φ1/2For the half-power half-angle of light emitting diode, d1It is luminous The distance between diode and photodiode, APDIndicate the detector area of photodiode, φ1For light emitting diode to light The angle of emergence of electric diode,For the incidence angle of light emitting diode to photodiode, Ψ1Indicate the half field-of-view of photodiode Angle;

Receive signal y are as follows:

Y=h1X+z, (9)

Wherein, z indicates that variance is σ2Zero-mean Gaussian noise;

Achievable rate RSISOAre as follows:

Wherein, α and γ is the parameter determined by A and ε, σ2For the variance of zero-mean Gaussian noise;

Achievable rate RSISOLower boundBy being distributed to obtain as follows:

Wherein α, β and γ are the solution of following equations:

T (A)-T (- A)=e1+α, (12a)

β(eA(β-γA)-e-A(β+γA)-e1+α)=0, (12b)

eA(β-γA)((β-2γA)e-2Aβ-β-2γA)+(β2+2γ)e1+α=4 γ2εe1+α, (12c)

Wherein,

With reference to first aspect, in one implementation, the step 1, further includes:

Step 1.3.2: the point-to-point energy collection module of the analysis point-to-point receiving end:

Channel gain h between light emitting diode and solar panel2:

Wherein, AsIndicate the detector area of solar panel, d2Between light emitting diode and solar panel Distance, φ2For the angle of emergence of light emitting diode to solar panel,For the incidence of light emitting diode to solar panel Angle, Ψ2Indicate the angle of half field-of view of solar panel;

The luminous flux phi that solar panel receivesOR:

ΦOR=h2ΦOT (14)

The solar panel illumination E received are as follows:

Wherein,For the relative spectral energy density of light emitting diode, λ is optical wavelength, θ=683lm/w,For standard luminosity function, EaIndicate the illumination (W/m of environment light2);

Using FOCV method and MPP tracking, output voltage U and open-circuit voltage UocIt is approximately:

U=η Uoc, (16)

Wherein, η is a coefficient, η ∈ [0.71,0.78];

According to MPP tracking, the output electric current I of solar panel are as follows:

Wherein, IphFor photogenerated current, Is0To be saturated dark current, c1For solar panel coefficient, RsFor equivalent series electricity Resistance, RshFor equivalent parallel resistance, and solar panel coefficientqeFor electron charge, k is that Boltzmann is normal Number, JfFor the ideality factor of diode, TaFor environment temperature;

According to equivalent-circuit model, the output electric current I of the solar panel is approximately:

Work as open circuit, i.e., when the output electric current I=0 of the described solar panel, have:

The photogenerated current IphWith the solar panel illumination E received the and environment temperature TaIt is directly proportional:

Wherein, Isc,stcFor the short circuit current under standard testing state, i.e. illumination E under standard testing statestc= 1000W/m2, environment temperature T under standard testing statea,stcShort circuit current when=298K, αstcFor short circuit current temperature system Number;

Formula (20) are substituted into formula (19b), the obtained open-circuit voltage UocFor

Wherein,

The saturation dark current I in formula (17)s0Depending on the environment temperature Ta:

Wherein, Is0,stcFor the dark saturation current under standard testing state, coefficientEg,stc=1.12eV For the band gap of the material under standard testing state;

Work as short circuit, is i.e. when the output voltage U=0, has

Iph=Isc, (23)

Wherein, IscFor short circuit current;

According to formula (18), the dark saturation current I under the standard testing state can be obtaineds0,stc:

Wherein, Uoc,stcFor the open-circuit voltage under standard testing state;

Obtain the output power P of solar panelsolarFor the function of the power gain g about power amplifier:

Wherein,

Solar panel energy Q collected by time Δtsolar(Δ t):

Qsolar(Δ t)=PsolarΔt (26)。

With reference to first aspect, in one implementation, the step 1, comprising:

Step 1.4: calculate illumination-rate-energy area of the point-to-point SLIPT VLC system:

The power gain g of the power amplifier and direct current biasing IDMeet:

Wherein,For maximum overall transmission power;

Convolution (2), formula (7) and formula (27), can obtain:

Introduce illumination-information-energy area CI-R-E, the illumination-information-energy area CI-R-EBy giving transmission power Illumination level τ, achievable rate R under constraint conditionSISOWith the energy Q of collectionsolarComposition, the illumination-information-energy area CI-R-EExpression formula are as follows:

Wherein,

With reference to first aspect, in one implementation, the step 2, comprising:

When N number of light emitting diode sends data and energy to K user simultaneously, s is enabledkIndicate N number of light emitting diode To the data symbol of k-th of user, wherein | sk|≤Ak,AkAnd εkRespectively k-th of data The amplitude peak and variance of symbol;

The multi-to-multi transmits signal x are as follows:

Wherein, K is total number of users,For data symbol skBeamforming vectors, 1N The vector that element is all 1 is tieed up for N × 1;

The average electrical power of the multi-to-multi transmission signal xAre as follows:

Wherein, N is light emitting diode quantity;

The beamforming vectors gkMeet:

Wherein, enFor base vector;

The luminous flux phi of n-th of light emitting dioden,OTAre as follows:

Wherein, gk,nFor the power gain between n-th of light emitting diode and k-th of user.

With reference to first aspect, in one implementation, step 2: according to the point-to-point SLIPT VLC system, establishing Multi-to-multi SLIPT VLC network, the multi-to-multi SLIPT VLC network include multi-to-multi transmitting terminal and multi-to-multi receiving end, institute It states multi-to-multi transmitting terminal and multi-to-multi transmission signal is converted into visible light by more than two light emitting diodes, and be sent to institute State multi-to-multi receiving end;

The visible light is carried out multipair multi information by more than two photodiodes and connect by the multi-to-multi receiving end It receives, or the visible light is subjected to multi-to-multi collection of energy by more than two solar panels.

The step 2, comprising: step 2.1: transmitting signal x according to the multi-to-multi of the multi-to-multi SLIPT VLC network, Analyze the light control of the multi-to-multi SLIPT VLC network:

The beamforming vectors gkMeet:

Wherein, IHFor light emitting diode maximum allowed current;

The average light power of multi-to-multi SLIPT VLC networkAre as follows:

The light control of the multi-to-multi SLIPT VLC network, i.e., the described illumination level τ, the multi-to-multi SLIPT VLC The average light power of networkWith the maximum luminous power PTBetween relationship:

With reference to first aspect, in one implementation, it the step 2, comprising: step 2.2: analyzes the multi-to-multi and connects The multi-to-multi information receiving module of receiving end:

The signal y received at k-th of user1,kAre as follows:

Wherein, giFor the beamforming vectors of i-th of user, siFor the data symbol for being sent to i-th of user, h1,k,nFor From n-th of light emitting diode to the channel gain of k-th of user's photodiode, h1,k=[h1,k,1,...,h1,k,N]TIndicate hair Channel vector between optical diode and user k, zkFor zero-mean, variance σ2Additive Gaussian noise;

The achievable rate of k-th of userAre as follows:

Wherein, parameter alphaiAnd γiBy AiAnd εiIt determines, AiAnd εiThe amplitude peak and variance of respectively i-th data symbol;

The lower bound of formula (38) is obtained by distribution as follows:

Wherein, αi, βiAnd γiFor the solution of following equations:

With reference to first aspect, in one implementation, it the step 2, comprising: step 2.3: analyzes the multi-to-multi and connects The multi-to-multi energy collection module of receiving end:

The illumination E received at k-th of userkAre as follows:

Wherein, h2,k,nIndicate n-th of light emitting diode to k-th of user's solar panel channel gain, For the relative spectral energy density of light emitting diode, λ is optical wavelength, θ=683lm/ W,For standard luminosity function, EaIndicate the illumination (W/m of environment light2), Φn,OTIt is n-th The luminous flux of light emitting diode;

At k-th of user, solar panel output voltage UkAre as follows:

Uk=η Uk,oc, (42)

Wherein, Uk,ocFor at k-th of user, the open-circuit voltage of solar panel;

Wherein,Ik,sc,stcFor under k-th of solar panel standard testing state Short circuit current, αk,stcFor the short circuit current temperature coefficient of k-th of solar panel, Ek,stcIt is surveyed for k-th of user in standard Received illumination, I under examination statek,s0For the saturation dark current of k-th of user;

The output electric current I of k-th of solar panelk:

The average output power of the solar panel of k-th of userAre as follows:

Wherein,K is total number of users, h2,k= [h2,k,1,...,h2,k,N]TIndicate the channel vector between light emitting diode and k-th of solar panel,

The present invention analyzes the signal stream of point-to-point SLIPT VLC system, to describe three main performance indicators: shining Bright, information transmission and collection of energy, study the signal processing method on point-to-point transmitting terminal.Next, of the invention Average illumination level is had evaluated based on light control, has also derived the power amplifier (power of point-to-point transmitting terminal Amplifier, PA) and the output voltage and electric current of solar panel between relationship, and point-to-point receiving end is quantified with this The energy of collection.Then, the present invention has obtained illumination-rate-energy area of the point-to-point SLIPT VLC system, realizes Information and energy common transport in point-to-point SLIPT VLC system.Finally, being investigated multi-to-multi SLIPT VLC network Downlink broadcast transmission derives that the illumination, information transmission and energy of the multi-to-multi SLIPT VLC network with explicit expression are received Relationship between collection realizes information and energy common transport in multi-to-multi SLIPT VLC network.

Detailed description of the invention

Fig. 1 is the embodiment of the present application method workflow schematic diagram;

Fig. 2 is the point-to-point transmitting terminal schematic diagram in a kind of point-to-point SLIPT VLC system of the embodiment of the present application;

Fig. 3 is the receiving end schematic diagram in a kind of existing visible light communication system;

Fig. 4 is the point-to-point receiving end schematic diagram in a kind of point-to-point SLIPT VLC system of the embodiment of the present application;

Fig. 5 is a kind of basic equivalence circuit diagram of solar panel of the embodiment of the present application;

Fig. 6 is a kind of downlink unicast transmission schematic diagram of multi-to-multi SLIPT VLC network of the embodiment of the present application;

Fig. 7 a is the energy Q that the embodiment of the present application solar panel is collectedsolarWith achievable rate lower limitWith direct current Bias IDThe curve synoptic diagram of variation;

Fig. 7 b is the energy Q that the embodiment of the present application solar panel is collectedsolarWith achievable rate lower limitWith power The curve synoptic diagram of the power gain g variation of amplifier;

Fig. 8 a is that the embodiment of the present application existsOverall transmission power in the case of with tri- kinds of 1.5bits/sec/HzWith light emitting diode quantity N change curve synoptic diagram;

Fig. 8 b is the embodiment of the present application electrical powerWith rate thresholdThe curve synoptic diagram of variation;

Fig. 8 c is that the embodiment of the present application existsWith 6bits/sec/Hz electrical powerWith collection of energy door LimitChange curve schematic diagram;

Fig. 9 is a kind of maximum rate lower limit of the embodiment of the present applicationWith energy thresholdThe curve of variation is illustrated Figure.

Specific embodiment

A kind of method that the present invention discloses information and energy common transport in visible light communication system.

It referring to Fig.1, is the method for information and energy common transport in a kind of visible light communication system provided in this embodiment Workflow schematic diagram, comprising the following steps:

Step 1: establishing point-to-point SLIPT VLC system, point-to-point SLIPT VLC system includes point-to-point transmitting terminal and point To a receiving end, point-to-point transmission signal is converted to visible light by a light emitting diode by point-to-point transmitting terminal, and is sent To point-to-point receiving end;

Point-to-point receiving end will be seen that light carries out point-to-point information reception by photodiode, or will be seen that light passes through Solar panel carries out point-to-point collection of energy;I.e. point-to-point only one light emitting diode of transmitting terminal, can will be point-to-point It transmits signal and is sent to a point-to-point receiving end in a period.

Step 2: according to point-to-point SLIPT VLC system, analyzing multi-to-multi SLIPT VLC network, multi-to-multi SLIPT VLC Network includes multi-to-multi transmitting terminal and multi-to-multi receiving end, and multi-to-multi transmitting terminal passes through multi-to-multi transmission signal more than two Light emitting diode is converted to visible light, and is sent to multi-to-multi receiving end;

Multi-to-multi receiving end will be seen that light carries out multipair multi information reception by more than two photodiodes, or will Visible light carries out multi-to-multi collection of energy by more than two solar panels.I.e. the configuration of multi-to-multi transmitting terminal is multiple shines Multi-to-multi can be transmitted signal and be sent to multi-to-multi receiving end by diode.

Specifically, present invention research one has the point-to-point SLIPT VLC system of a light emitting diode in transmission end, As shown in Figure 2.In point-to-point transmitting terminal, signal is first by modulators modulate at digital signal.Then, digital signal passes through digital-to-analogue Converter is converted into analog form, is amplified by power amplifier.After power amplifier, signal is added by bias device Enter the direct current in light emitting diode source.Finally, light emitting diode converts the signal into visible light, it is sent to point-to-point receiving end.

Step 1 includes step 1.1: calculating point-to-point transmission signal x.As shown in Fig. 2, enable s indicate continuous data symbol andRandom real number.In addition, given A > 0 and ε > 0, peak amplitude and variance be respectively-A≤s≤A andAfter power amplifier, point-to-point transmission signal x are as follows:

Wherein g is the power gain of power amplifier, IDFor direct current biasing.Because point-to-point transmission signal x be it is non-negative, I.e.So g should meet:

The average electrical power of point-to-point transmission signal x are as follows:

In addition, the luminous flux phi of light emitting diodeOTFor [2]: ΦOT=354.286x+27, (4)

Step 1 includes step 1.2: according to point-to-point transmission signal x, analyzing the illumination control of point-to-point SLIPTVLC system System: light control is one of the basic demand of VLC system, is to meet actual illumination requirement by adjusting average light power.Enable τ Indicate illumination level,Indicate average light power.τ,And PTBetween relationship:

Wherein PTFor maximum luminous power, therefore 0 τ≤1 <.In addition, according to formula (1), average light powerBy direct current biasing IDIt determines, it may be assumed that

Therefore, the control of illumination level can pass through IDIt adjusts to realize, i.e.,

In view of eye-safe and light emitting diode maximum allowed current [3]-[5], if IHPermit for light emitting diode maximum Perhaps electric current, that is,Therefore, the power gain g of power amplifier meets:

Therefore, point-to-point transmitting terminal can control power gain g to meet illumination and safety requirements.Light emitting diode issues Signal be light wave form, be uniformly distributed in space.Light wave is transferred to point-to-point receiving end by optical channel, point-to-point The photodiode or solar panel of receiving end can capture them.As shown in figure 3, the receiving end of the prior art uses Photodiode or solar panel receive signal, obtain separation signal using power splitting technique, a part is used for information Decoding, another part are collected for energy.However, photodiode and solar panel have in different tasks it is respective Advantage, therefore present invention employs a kind of composite structure, i.e. a photodiode is received for information, a solar battery Plate is used for collection of energy, as shown in Figure 4.

Step 1 includes step 1.3.1: analyzing the point-to-point information receiving module of point-to-point receiving end.Optical channel is shining It is leading by direct sight (direct line-of-sight, LoS) link between diode and photodiode, and reflex chain The gain on road can be ignored [6]-[8].Enable h1Indicate the LoS link gain between light emitting diode and photodiode [9]:

WhereinFor lambert's index;φ1/2For the half-power half-angle of light emitting diode;d1It is luminous two The distance between pole pipe and photodiode;APDIndicate the detector area of photodiode;φ1WithRespectively light-emitting diodes Manage the angle of emergence and incidence angle of photodiode;Ψ1Indicate the area of visual field (field-of-view, FOV) of photodiode Half, i.e. the angle of half field-of view of photodiode.

In information receiving module, the light that light emitting diode issues is converted into analog signal by photodiode, then mould Analog signal is sampled into digital form by number converter.Assuming that light emitting diode is non-linear by using predistortion and rear distortion Technology is eased.Under normal circumstances, the signal y received can be indicated are as follows:

Y=h1X+z, (9)

Wherein z indicates that variance is σ2Zero-mean Gaussian noise.

The channel capacity of VLC channel be it is unknown, the present invention is analyzed using rate expression formula achievable in [10] SLIPT VLC system.RSISOIndicate achievable rate:

Wherein α and γ are determined by A and ε.Achievable rate RSISORSISOLower bound obtains [10] by distribution as follows:

Wherein α, β and γ are the solution of following equations:

T (A)-T (- A)=e1+α, (12a)

β(eA(β-γA)-e-A(β+γA)-e1+α)=0, (12b)

eA(β-γA)((β-2γA)e-2Aβ-β-2γA)+(β2+2γ)e1+α=4 γ2εe1+α, (12c)

Wherein,The present invention usesCarry out R in expression (10)SISOLower bound.

Step 1 includes step 1.3.2: analyzing the point-to-point energy collection module of point-to-point receiving end: in collection of energy mould In block, the light of light and surrounding that light emitting diode issues all is converted into analog electrical signal by solar panel, by rectifier Filtering after store in the battery.Similarly, h is enabled2Indicate the channel gain between light emitting diode and solar panel:

Wherein, AsIndicate the detector area of solar panel, d2Between light emitting diode and solar panel Distance, φ2For the angle of emergence of light emitting diode to solar panel,For the incidence of light emitting diode to solar panel Angle, Ψ2Indicate the angle of half field-of view of solar panel.

The luminous flux phi that solar panel receivesORIt can be obtained by [11]:

ΦOR=h2ΦOT (14)

Since bias light and LED light lamp are usually incoherent, the solar panel illumination that receives Are as follows:

WhereinFor the relative spectral energy density [2] of light emitting diode, λ is optical wavelength, θ=683lm/w,For standard luminosity function [12];EaIndicate the illumination (W/m of environment light2)。

The basic equivalence circuit of solar panel is as shown in Figure 5.Due to solar panel usually have it is certain non- Linear C-V characteristic, therefore generally use the analysis output of maximum power point (maximum power point, MPP) tracking technique Power.There are many [13]-[16] for MPP tracking, and the present invention is using widely used in small-sized solar panel system Part open-circuit voltage (fractional open-circuit voltage, FOCV) method [15], [16].Utilize FOCV method With MPP tracking, output voltage U and open-circuit voltage UocIt can be approximated to be [16]:

U=η Uoc, (16)

Wherein, η ∈ [0.71,0.78] is a coefficient.According to equivalent-circuit model, solar panel output electric current I is [17], [18]:

Wherein, IphFor photogenerated current, Is0To be saturated dark current, c1For solar panel coefficient, RsFor equivalent series electricity Resistance, RshFor equivalent parallel resistance, and solar panel coefficientqeFor electron charge, k is that Boltzmann is normal Number, JfFor the ideality factor of diode, TaFor environment temperature.

In room conditions, electric current I and series resistance R is exportedsValue generally respectively milliampere and milliohm horizontal [19], [20].Output voltage U is not more than 10 volts, parallel resistance RshNot less than 1 kilohm [19], [20].Therefore, in formula (17)Item can be ignored, and Rsh> > Rs, so output electric current I can be approximated to be:

When working as open circuit, i.e. I=0, have:

In addition, photogenerated current IphWith illumination E and environment temperature TaDirectly proportional [17], [22]:

Wherein Isc,stcIt is standard testing state (Standard Test Conditions, STC) that is, illumination is Estc= 1000W/m2;Environment temperature Ta,stcShort circuit current when=298K, αstcFor short circuit current temperature coefficient.

Formula (20) are substituted into formula (19b), obtained open-circuit voltage UocAre as follows:

Wherein

Saturation dark current in formula (17) depends on environment temperature Ta[17], [22]:

Wherein Is0,stcFor the dark saturation current in standard testing state,Eg,stc=1.12eV.

When working as short circuit, i.e. U=0, have:

Iph=Isc, (23)

According to formula (18), I can be obtaineds0,stc:

Wherein, Uoc,stcFor the open-circuit voltage under standard testing state.

Finally, the output power for obtaining solar panel is the function of the power gain g of power amplifier:

WhereinFormula (25c) be approximately becauseWith one Rank Taylor expansion: ln (1+x) ≈ x;

Therefore, solar panel energy collected by time Δt can be obtained in the present invention:

Qsolar(Δ t)=PsolarΔt (26)

Step 1 includes step 1.4: calculate illumination-rate-energy area of point-to-point SLIPT VLC system:

Up to the present, the present invention has been obtained rate and harvests power gain g of the energy about power amplifier The explicit expression of function provides in formula (10) and formula (25) respectively.Under actual circuit consideration, the electrical power of VLC signal It is also restrained.Therefore, the power gain g and I of power amplifierDMeet:

Wherein,For maximum overall transmission power.

Convolution (2), formula (7) and formula (27), can obtain:

Finally, the region is by under given transmission power constraint condition invention introduces illumination-information-energy area Illumination level τ, achievable rate RSISOWith the energy Q of collectionsolarComposition, illumination-information-energy area CI-R-EExpression formula are as follows:

Wherein,

In step 2, multi-to-multi transmitting terminal configures multiple light emitting diodes, multi-to-multi transmission signal can be sent to multipair More receiving ends, each receiving module in multi-to-multi receiving end represent a user.As shown in fig. 6, N number of light emitting diode is same When to K user send data and energy.Enable skIndicate N number of light emitting diode give k-th of user data symbol, wherein | sk| ≤Ak,AkAnd εkThe amplitude peak and variance of respectively k-th data symbol.It enablesIndicate data symbol skBeamforming vectors, multi-to-multi transmit signal x are as follows:

Wherein, K is total number of users, gkFor data symbol skBeamforming vectors, 1NFor N × 1 tie up element be all 1 to Amount.

The average electrical power of multi-to-multi transmission signal x are as follows:

Wherein N is light emitting diode quantity.Guarantee the nonnegativity of multi-to-multi transmission signal x, beamforming vectors gkMeet:

Wherein, enFor base vector;In addition, the luminous flux of n-th of light emitting diode are as follows:

Wherein, gk,nFor the power gain between n-th of light emitting diode and k-th of user.

Step 2 includes step 2.1: transmitting signal x according to the multi-to-multi of multi-to-multi SLIPT VLC network, analyzes multi-to-multi The light control of SLIPT VLC network: assuming that the non-linear of light emitting diode can be reduced using predistortion and rear anti-aliasing techniques. Consider the maximum allowed current of eye-safe and light emitting diode, beamforming vectors gkMeet:

Wherein, IHFor light emitting diode maximum allowed current.The average light power of multi-to-multi SLIPT VLC network are as follows:

The light control of multi-to-multi SLIPT VLC network, the i.e. average light of illumination level τ, multi-to-multi SLIPT VLC network PowerWith maximum luminous power PTBetween relationship:

Step 2 includes step 2.2: the multi-to-multi information receiving module of analysis multi-to-multi receiving end:

It is similar with formula (8), enable h1,k,nFor from n-th of light emitting diode to the channel gain of k-th of user's photodiode, Enable h1,k=[h1,k,1,…,h1,k,N]TIndicate the channel vector between LED source and user k, then in k-th of user Place, the signal y received1,kAre as follows:

Wherein, giFor the beamforming vectors of i-th of user, siFor the data symbol for being sent to i-th of user, zkIt is zero Mean value, variance σ2Additive Gaussian noise.

According to [10], the achievable rate of k-th of userAre as follows:

Wherein, parameter alphaiAnd γiBy AiAnd εiIt determines, AiAnd εiThe amplitude peak and variance of respectively i-th data symbol. The lower bound of formula (38) obtains [10] by distribution as follows:

Wherein, αi, βiAnd γiFor the solution of following equations:

Step 2 includes step 2.3: the multi-to-multi energy collection module of analysis multi-to-multi receiving end:

Similar to formula (13), h is enabled2,k,nChannel gain of n-th of light emitting diode to k-th of user's solar panel. At k-th of user, the illumination E that receiveskAre as follows:

Wherein, For the relative spectral energy density of light emitting diode, λ is light wave Wavelength, θ=683lm/w,For standard luminosity function, EaIndicate the illumination (W/ of environment light m2), Φn,OTFor the luminous flux of n-th of light emitting diode.

At k-th of user, solar panel output voltage UkAre as follows:

Uk=η Uk,oc, (42)

Wherein, Uk,ocFor at k-th of user, the open-circuit voltage of solar panel, it may be assumed that

WhereinIk,sc,stcFor under k-th of solar panel standard testing state Short circuit current, αk,stcFor the short circuit current temperature coefficient of k-th of solar panel, Ek,stcIt is surveyed for k-th of user in standard Received illumination, I under examination statek,s0For the saturation dark current of k-th of user.

Meanwhile the output electric current I of k-th of solar panelk:

Therefore, the average output power of the solar panel of k-th of userAre as follows:

Wherein,h2,k=[h2,k,1,…, h2,k,N]TIndicate the channel vector between light emitting diode and k-th of solar panel,

The present invention discloses in a kind of visible light communication system on the basis of information and the method for energy common transport, analyzes The solution of multi-to-multi SLIPT VLC network design issue: step 3: on the basis of analysis multi-to-multi SLIPT VLC network On, have studied two typical SLIPT VLC system design problems: overall transmission power minimization problem and minimum-rate maximize Problem.Step 3 includes step 3.1: explicit achievable rate expression formula (38) and collection of energy expression formula (45c) is utilized, in order to make Overall transmission power minimizes, while meeting rate requirement, and least energy, which is collected, to be required and light control constraint.Mathematically, multipair The overall transmission power minimization problem of more SLIPT VLC networks can indicate are as follows:

NID=τ PT, (46e)

Wherein rkFor the rate requirement of k-th of user, vkFor the collection energy requirement of k-th of user.

Formula (46e) is substituted into formula (46d), problem (46) can equivalently restatement are as follows:

Due to rate constraint (47b) and collection of energy constraint (47c), this is a non-convex problem.

In order to solve the problems, such as (47), the present invention is firstly introduced into following new definition:

According to definition (48), problem (47) can be rewritten into succinct form are as follows:

Wherein

In order to handle non-convex constraint (49b) and (49c), present invention employs SDR technologies.Especially by using with subordinate Property:

And ignore non-convex order constraint rank (G)=1, problem (49) relaxation are as follows:

DefinitionFor the optimal solution of problem (51), if(51) problem is obtained by Eigenvalues Decomposition Optimal beam forming vectorIfGaussian random process [23] is used forObtain the feasible of problem (51) Solution

Step 3 includes step 3.2: multi-to-multi SLIPT VLC network minimum-rate maximization problems.Consider user rate Fairness policy, the design by optimizing Beam-former design setThe value of middle element is maximum Change minimum-rate, while meeting least energy and collecting requirement and light control constraint:

NID=τ PT (52d)

Wherein vkFor the collection energy requirement of k-th of user,For maximum overall transmission power.

(52d) is substituted into (52c), introduces auxiliary variableProblem (52) can equivalently restatement are as follows:

Due to rate constraint (53b) and collection of energy constraint (53c), this is a non-convex problem.

According to definition (48), problem (53) can be rewritten as simplified form:

Wherein,

In order to handle non-convex constraint (54b) and (54c), present invention employs SDR technologies.Specifically, ignore non-convex order It constrains rank (G)=1, problem (54) can relax are as follows:

Due to the variable in constraint condition (55b)This problem is still non-convex.However, for givenIt asks It is convex for inscribing (55).Therefore, problem (55) is one and intends convex optimization problem, its globally optimal solution can use simple dichotomy Search.Specifically, for givenProblem (55) can be attributed to SDP feasibility subproblem sequence:

findG (56a)

Algorithm 1 describes the dichotomy of processing problem (55).DefinitionFor the optimal solution of problem (55).IfThe optimal beam forming vector of problem (54) is then obtained by Eigenvalues DecompositionIfGaussian random process [23] can be applied to by the present inventionObtain the feasible solution of problem (54)

1 algorithm 1 of table: dichotomy

Step 4: simulation result.It gives some numerical results and carrys out influence of the analysis of key factor to system performance.Assuming that The peak amplitude and variance of input data s is respectively A=2, ε=1.Light emitting diode, photodiode and solar panel Parameter be shown in Table 2, parameter reference uses [25]-[27] from [1], the circuit framework of [24], solar panel.Photovoltaic module is adopted Use monocrystaline silicon solar cell.The power spectral density of additive noise is -98.82dBm.

2 light emitting diode of table, photodiode and solar battery board parameter

Step 4 includes step 4.1: the simulation result of point-to-point SLIPT VLC system.Such as Fig. 7 a, with direct current biasing ID Increase, the energy of collection increases in logarithmic.This is because the display in (25),Number Magnitude is in PsolarIn predominantly side.Achievable rate lower limitFirst increase, then slowly reduces.This is because such as formula (29) It is shown, rate limitIt is not one about direct current biasing IDMonotonic function.Note that in simulations, power amplifier Power gain g is equal toAs direct current biasing IDWhen smaller, with direct current biasing IDIncreasing Add, the power gain g of power amplifier increases in quadratic form.Direct current biasing IDWhen larger, the power gain g of power amplifier with Direct current biasing IDIncrease in quadratic form reduce.

As shown in Figure 7b, as the power gain g of power amplifier increases, the energy Q that solar panel is collectedsolarIncrease Add, and achievable rate lower boundIt quicklys increase and then is slowly increased, this shows that increasing the power gain g of power amplifier is to have The energy transfer of effect, rather than effectively improve transmission speed.

Step 4 includes step 4.2: the simulation result of multi-to-multi SLIPT VLC network.Assuming that having 9 light emitting diodes and 2 A user, that is, N=9, K=2.Moreover, it is assumed that The position of photodiode s, solar panel and light emitting diode are shown in Table 3.

The position of 3 photodiode of table, light emitting diode and solar panel

In Fig. 8 aK=2, it is known that the general power in the case of three kinds is with light emitting diode quantity N's Increase and reduces.In addition,Value is higher, and the requirement to transimission power is bigger.Known in Fig. 8 b about with or without harvest energy Beam, electrical powerAll with rate thresholdIncrease and is increased monotonically.CompareWithTwo kinds of situations, collection of energy thresholding is higher, and transimission power consumption is bigger.In Fig. 8 c, it is known that electrical powerWith collection of energy thresholdingIncrease in logarithmic increase.Meanwhile rate thresholdTransimission power that is higher, needing It is bigger.In Fig. 9, it is known that maximum rate lower limitWith collection of energy thresholdingIncrease and reduce.Finally, by comparing power BudgetThe case where, it is known that transimission power budget is higher, maximum rate lower limitIt is bigger.

In the present invention, a kind of novel SLIPT VLC system is devised, respectively with photodiode and solar battery Plate is as information receiving module and energy collection module.By the analysis to information receiving module and energy collection module, provide Illumination-rate-energy area of SLIPT VLC system.On this basis, the present invention has further derived multi-to-multi SLIPT The explicit expression of the information transmission and collection of energy of VLC network, and overall transmission power minimization problem and most is had studied respectively The Beam-former of bigization rate limit problem designs.Simulation result shows that proposed Beam-former design can Guarantee the performance of VLC network.

In the specific implementation, the application also provides a kind of computer storage medium, wherein the computer storage medium can store There is program, which may include information and energy common transport in a kind of visible light communication system provided by the present application when executing Step some or all of in each embodiment of method.The storage medium can be magnetic disk, CD, read-only memory (English: read-only memory, referred to as: ROM) or random access memory (English: random access memory, letter Claim: RAM) etc..

It is required that those skilled in the art can be understood that the technology in the embodiment of the present application can add by software The mode of general hardware platform realize.Based on this understanding, the technical solution in the embodiment of the present application substantially or Say that the part that contributes to existing technology can be embodied in the form of software products, which can deposit Storage is in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that computer equipment (can be with It is personal computer, server or the network equipment etc.) execute certain part institutes of each embodiment of the application or embodiment The method stated.Same and similar part may refer to each other between each embodiment in this specification.

Above-described the application embodiment does not constitute the restriction to the application protection scope.

Claims (10)

1. a kind of method of information and energy common transport in visible light communication system characterized by comprising
Step 1: establishing point-to-point SLIPT VLC system, the point-to-point SLIPT VLC system includes point-to-point transmitting terminal and point To a receiving end, point-to-point transmission signal is converted to visible light by a light emitting diode by the point-to-point transmitting terminal, and It is sent to the point-to-point receiving end;
The visible light is carried out point-to-point information reception by photodiode by the point-to-point receiving end, or can by described in It is light-exposed that point-to-point collection of energy is carried out by solar panel.
2. the method according to claim 1, wherein the step 1, comprising:
Step 1.1: calculate the point-to-point transmission signal x:
Enable s indicate continuous data symbol andRandom real number;
The peak amplitude of s is-A≤s≤A, and the variance of s isWherein A > 0, ε > 0;
The point-to-point transmission signal x are as follows:
Wherein, g is the power gain of power amplifier, IDFor direct current biasing;
The power gain g of the power amplifier should meet:
The average electrical power of the point-to-point transmission signal xAre as follows:
The luminous flux phi of the light emitting diodeOTAre as follows:
ΦOT=354.286x+27, (4).
3. according to the method described in claim 2, it is characterized in that, the step 1, comprising:
Step 1.2: according to the point-to-point transmission signal x, analyze the light control of the point-to-point SLIPT VLC system:
The light control of the point-to-point SLIPT VLC, the i.e. average light power of illumination level τ, point-to-point SLIPT VLC systemWith maximum luminous power PTBetween relationship:
0 τ≤1 <;
According to formula (1), the average light power of the point-to-point SLIPT VLC systemBy the direct current biasing IDIt determines, i.e.,
The power gain g of the power amplifier meets:
Wherein, IHFor light emitting diode maximum allowed current, i.e.,
4. according to the method described in claim 3, it is characterized in that, the step 1, comprising:
Step 1.3.1: the point-to-point information receiving module of the analysis point-to-point receiving end:
LoS link gain h between the light emitting diode and the photodiode1Are as follows:
Wherein,For lambert's index, φ1/2For the half-power half-angle of light emitting diode, d1For light-emitting diodes The distance between pipe and photodiode, APDIndicate the detector area of photodiode, φ1For light emitting diode to photoelectricity two The angle of emergence of pole pipe,For the incidence angle of light emitting diode to photodiode, Ψ1Indicate the angle of half field-of view of photodiode;
Receive signal y are as follows:
Y=h1X+z, (9)
Wherein, z indicates that variance is σ2Zero-mean Gaussian noise;
Achievable rate RSISOAre as follows:
Wherein, α and γ is the parameter determined by A and ε, σ2For the variance of zero-mean Gaussian noise;
The achievable rate RSISOLower boundBy being distributed to obtain as follows:
Wherein α, β and γ are the solution of following equations:
T (A)-T (- A)=e1+α, (12a)
β(eA(β-γA)-e-A(β+γA)-e1+α)=0, (12b)
eA(β-γA)((β-2γA)e-2Aβ-β-2γA)+(β2+2γ)e1+α=4 γ2εe1+α, (12c)
Wherein,
5. the method according to claim 3 or 4, which is characterized in that the step 1, further includes:
Step 1.3.2: the point-to-point energy collection module of the analysis point-to-point receiving end:
Channel gain h between light emitting diode and solar panel2:
Wherein, AsIndicate the detector area of solar panel, d2Between light emitting diode and solar panel away from From φ2For the angle of emergence of light emitting diode to solar panel,For the incidence of light emitting diode to solar panel Angle, Ψ2Indicate the angle of half field-of view of solar panel;
The luminous flux phi that solar panel receivesOR:
ΦOR=h2ΦOT (14)
The solar panel illumination E received are as follows:
Wherein,For the relative spectral energy density of light emitting diode, λ is optical wavelength, θ=683lm/w,For standard luminosity function, EaIndicate the illumination (W/m of environment light2);
Using FOCV method and MPP tracking, output voltage U and open-circuit voltage UocIt is approximately:
U=η Uoc, (16)
Wherein, η is a coefficient, η ∈ [0.71,0.78];
According to equivalent-circuit model, the output electric current I of solar panel are as follows:
Wherein, IphFor photogenerated current, Is0To be saturated dark current, c1For solar panel coefficient, RsFor equivalent series resistance, Rsh For equivalent parallel resistance, and solar panel coefficientqeFor electron charge, k is Boltzmann constant, JfFor The ideality factor of diode, TaFor environment temperature;
The output electric current I of the solar panel is approximately:
Work as open circuit, i.e., when the output electric current I=0 of the described solar panel, have:
The photogenerated current IphWith the solar panel illumination E received the and environment temperature TaIt is directly proportional:
Wherein, Isc,stcFor the short circuit current under standard testing state, i.e. illumination E under standard testing statestc=1000W/m2, Environment temperature T under standard testing statea,stcShort circuit current when=298K, αstcFor short circuit current temperature coefficient;
Formula (20) are substituted into formula (19b), the obtained open-circuit voltage UocFor
Wherein,
The saturation dark current I in formula (17)s0Depending on the environment temperature Ta:
Wherein, Is0,stcFor the dark saturation current under standard testing state, coefficientEg,stc=1.12eV is mark The band gap of material under quasi- test mode;
Work as short circuit, is i.e. when the output voltage U=0, has
Iph=Isc, (23)
Wherein, IscFor short circuit current;
According to formula (18), the dark saturation current I under the standard testing state can be obtaineds0,stc:
Wherein, Uoc,stcFor the open-circuit voltage under standard testing state;
Obtain the output power P of solar panelsolarFor the function of the power gain g about power amplifier:
Wherein,
Solar panel energy Q collected by time Δtsolar(Δ t):
Qsolar(Δ t)=PsolarΔt (26)。
6. according to the method described in claim 5, it is characterized in that, the step 1, comprising:
Step 1.4: calculate illumination-rate-energy area of the point-to-point SLIPT VLC system:
The power gain g of the power amplifier and direct current biasing IDMeet:
Wherein,For maximum overall transmission power;
Convolution (2), formula (7) and formula (27), can obtain:
Introduce illumination-information-energy area CI-R-E, the illumination-information-energy area CI-R-EItem is constrained by given transmission power Illumination level τ, achievable rate R under partSISOWith the energy Q of collectionsolarComposition, the illumination-information-energy area CI-R-E's Expression formula are as follows:
Wherein,
7. the method according to claim 1, wherein including step 2: according to the point-to-point SLIPT VLC system System, establishes multi-to-multi SLIPT VLC network, the multi-to-multi SLIPT VLC network includes that multi-to-multi transmitting terminal and multi-to-multi connect Multi-to-multi transmission signal is converted to visible light by more than two light emitting diodes by receiving end, the multi-to-multi transmitting terminal, and It is sent to the multi-to-multi receiving end;
The visible light is carried out multipair multi information reception by more than two photodiodes by the multi-to-multi receiving end, or The visible light is carried out multi-to-multi collection of energy by more than two solar panels by person;
It specifically includes:
When N number of light emitting diode sends data and energy to K user simultaneously, s is enabledkIndicate N number of light emitting diode to kth The data symbol of a user, wherein | sk|≤Ak,AkAnd εkRespectively k-th data symbol Amplitude peak and variance;
The multi-to-multi transmits signal x are as follows:
Wherein, K is total number of users,For data symbol skBeamforming vectors, 1NFor N × 1 dimension element is all 1 vector;
The average electrical power of the multi-to-multi transmission signal xAre as follows:
Wherein, N is light emitting diode quantity;
The beamforming vectors gkMeet:
Wherein, enFor base vector;
The luminous flux phi of n-th of light emitting dioden,OTAre as follows:
Wherein, gk,nFor the power gain between n-th of light emitting diode and k-th of user.
8. the method according to the description of claim 7 is characterized in that the step 2 includes:
Step 2.1: signal x being transmitted according to the multi-to-multi of the multi-to-multi SLIPT VLC network, analyzes the multi-to-multi SLIPT The light control of VLC network:
The beamforming vectors gkMeet:
Wherein, IHFor light emitting diode maximum allowed current;
The average light power of multi-to-multi SLIPT VLC networkAre as follows:
The light control of the multi-to-multi SLIPT VLC network, i.e., the described illumination level τ, the multi-to-multi SLIPT VLC network Average light powerWith the maximum luminous power PTBetween relationship:
9. according to the method described in claim 8, it is characterized in that, the step 2 includes:
Step 2.2: analyze the multi-to-multi information receiving module of the multi-to-multi receiving end:
The signal y received at k-th of user1,kAre as follows:
Wherein, giFor the beamforming vectors of i-th of user, siFor the data symbol for being sent to i-th of user, h1,k,nFor from n-th Channel gain of a light emitting diode to k-th of user's photodiode, h1,k=[h1,k,1,…,h1,k,N]TIndicate light-emitting diodes Channel vector between pipe and user k, zkFor zero-mean, variance σ2Additive Gaussian noise;
The achievable rate of k-th of userAre as follows:
Wherein, parameter alphaiAnd γiBy AiAnd εiIt determines, AiAnd εiThe amplitude peak and variance of respectively i-th data symbol;
The lower bound of formula (38) is obtained by distribution as follows:
Wherein, αi, βiAnd γiFor the solution of following equations:
10. according to the method described in claim 9, it is characterized in that, the step 2 includes:
Step 2.3: analyze the multi-to-multi energy collection module of the multi-to-multi receiving end:
The illumination E received at k-th of userkAre as follows:
Wherein, h2,k,nIndicate n-th of light emitting diode to k-th of user's solar panel channel gain, For the relative spectral energy density of light emitting diode, λ is optical wavelength, θ= 683lm/w,For standard luminosity function, EaIndicate the illumination (W/m of environment light2), Φn,OT For the luminous flux of n-th of light emitting diode;
At k-th of user, solar panel output voltage UkAre as follows:
Uk=η Uk,oc, (42)
Wherein, Uk,ocFor at k-th of user, the open-circuit voltage of solar panel;
Wherein,Ik,sc,stcIt is short under k-th of solar panel standard testing state Road electric current, αk,stcFor the short circuit current temperature coefficient of k-th of solar panel, Ek,stcIt is k-th of user in standard testing shape Received illumination, I under statek,s0For the saturation dark current of k-th of user;
The output electric current I of k-th of solar panelk:
The average output power of the solar panel of k-th of userAre as follows:
Wherein,h2,k=[h2,k,1,…,h2,k,N]T Indicate the channel vector between light emitting diode and k-th of solar panel,
CN201910151387.3A 2019-02-28 2019-02-28 A kind of method of information and energy common transport in visible light communication system CN109951229A (en)

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