CN103684598B - Visible light communication system - Google Patents
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- CN103684598B CN103684598B CN201410004701.2A CN201410004701A CN103684598B CN 103684598 B CN103684598 B CN 103684598B CN 201410004701 A CN201410004701 A CN 201410004701A CN 103684598 B CN103684598 B CN 103684598B
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Abstract
The embodiment of the invention provides a visible light communication system. The visible light communication system comprises M light-emitting lamp cores, a receiving module, a first processing module, a power distributing module, a driving module, a photoelectric converting module, a wideband acquiring module and a second processing module. A correct data signal can be analyzed by the visible light communication system provided by the embodiment of the invention due to the fact that a receiving end can judge from which light-emitting lamp core a superposed light signal is emitted.
Description
Technical field
The present invention relates to the communications field, is to be related to visible light communication system in particular.
Background technology
In recent years, it is seen that Optical Communication Technology Development is more and more rapider, it is seen that optical communication technique is referred to using luminous wick（Example
Such as fluorescent lamp or light emitting diode）As light source, with light space as communication channel, modulates baseband signals are carried out on visible ray
The wireless light communication technology of communication.
Visible light communication system of the prior art includes transmitting terminal and receiving terminal, and transmitting terminal includes：Signal sends mould
Block, drive module and luminous wick, receiving terminal includes：Photodiode PD and broadband acquisition module, signal transmitting module can be with
Data signal is sent, and the data signal after process is sent into optical signal by drive module driven for emitting lights wick.In the optical signal
Above-mentioned data signal is carried, the light that the above-mentioned luminous wick for receiving sends can be converted to telecommunications by photodiode PD
Number, broadband acquisition module is used to gather the data signal carried in the signal of telecommunication, this completes visible light communication.
Inventor has found during the invention is realized, if transmitting terminal includes multiple luminous wick lamps, due to
The optical signal that multiple luminous wicks send can be superimposed, and such receiving terminal cannot be distinguished by each optical signal to be lighted by which
What wick sent out, so as to correct data signal cannot be parsed.
The content of the invention
In view of this, the invention provides a kind of visible light communication system, if due to sending in overcome prior art
End includes multiple luminous wick lamps, and receiving terminal cannot be distinguished by each optical signal and be sent out by which luminous wick, so as to
The problem of correct data signal cannot be parsed.
For achieving the above object, the present invention provides following technical scheme：
A kind of visible light communication system, including：
M luminous wick, M is the positive integer more than or equal to 2；
Receiver module, for receiving data signal waiting for transmission, the data signal includes N number of data, the N be more than
Positive integer equal to 1 and less than or equal to M；
First processing module, for being processed K data in N number of data according to the first preset rules, will locate
The K data after reason carries out binary switch keying OOK modulation, obtains K signals corresponding with the K data, institute
State K=1,2 ..., N；
Power distribution module, for according to the characteristic of channel of the communication channel of the K signals, being the K signals pair
The luminous wick distribution K driving powers of K layers answered；
Drive module, it is described for according to the K driving powers, driving the luminous wick of the K layers to send to carry
The optical signal of K signals；
Photoelectric conversion module, for the optical signal that the N number of described luminous wick for receiving sends to be converted to into the signal of telecommunication；
Broadband acquisition module, for obtaining N number of signal that N number of luminous wick sends from the signal of telecommunication；
Second processing module, for according to N number of luminous wick and the driving being respectively allocated for N number of luminous wick
The corresponding relation of power, determines that the corresponding K layers of K signals with the K driving powers are sent out from N number of signal
Light wick, is processed the K signals according to the second preset rules corresponding with first preset rules, is obtained and institute
The corresponding K data of K signals is stated, according to the K signals of the luminous wick transmission of the K layers in the position of the data signal
The described N number of data for obtaining are combined into the data signal by information.
Wherein, the first processing module includes：
Coding unit, for being encoded for the K data；
Interleave unit, for the K data after the coding that exports to the coding unit modulation is interleaved；
OOK modulating units, for the K data after the intertexture that exports to the interleave unit binary switch is carried out
Keying OOK is modulated, and obtains K signals corresponding with the K data.
Wherein, the M luminous wick is the luminous wick with same size parameter, and the first processing module is also
Including：
Change driving power unit, for when Preset Time arrives, by N number of luminous wick L layers it is luminous
The driving power of wick is set to the driving power of the luminous wick of F layers, wherein L ≠ F, and L and F is more than or equal to 1 and little
In equal to N.
Wherein, the first processing module also includes：
Generate indicating member, in N number of luminous wick before optical signal is sent, it is described N number of luminous arranging
After the driving power of wick, generate first and indicate, described first indicates to include N number of luminous wick and for described N number of
The K signals that the corresponding relation of the driving power that light wick is respectively allocated and the luminous wick of the K layers send are in the data
The positional information of signal；
Accordingly, the Second processing module specifically for：According to described first indicate in described N number of luminous wick with
The corresponding relation of the driving power being respectively allocated for N number of luminous wick, determines with described from N number of signal
The luminous wick of the corresponding K layers of K signals of K driving powers, according to the corresponding with first preset rules second default rule
Then the K signals are processed, K data corresponding with the K signals is obtained, the institute in indicating according to described first
The positional information of the K signals in the data signal of the luminous wick transmission of K layers is stated, by the described N number of data combination for obtaining
Into the data signal.
Wherein, the Second processing module specifically for：The Preset Time that foundation is prestored, and N number of electroluminescent lamp
Core and the corresponding relation for being the driving power that N number of luminous wick is respectively allocated, when determining current from N number of signal
Between there is the luminous wick of the corresponding K layers of K signals of the K driving powers, according to corresponding with first preset rules
The second preset rules the K signals are processed, corresponding with K signals K data is obtained, according to depositing in advance
Store up the positional information of the K signals in the data signal of the luminous wick transmission of the K layers, the described N number of data that will be obtained
It is combined into the data signal.
Wherein, the Second processing module includes：
Signal estimation unit, for according to N number of luminous wick and the driving being respectively allocated for N number of luminous wick
The corresponding relation of power, determines that the corresponding K layers of K signals with the K driving powers are sent out from N number of signal
Light wick, according to the K signals of the luminous wick transmission of the K layers in the positional information of the data signal, the K is believed
Number send to deinterleaving unit；
The deinterleaving unit, for being deinterleaved modulation for the K signals；
Decoding unit, the signal for deinterleaving unit output for the K is decoded, and obtains K data.
Wherein, also include：
Determining module, for determining the characteristic of channel of the communication channel of the luminous wick of the K layers；
Function module is obtained, for being default signal to noise ratio in the snr value of the communication channel of the luminous wick of the K layers
Under value, according to the characteristic of channel of the communication channel of the luminous wick of the K layers, the institute of the Signal estimation unit output is determined
State the Soft Inform ation estimated value of K signals, the bit error rate of Soft Inform ation estimated value, the K signals according to the K signals with
And the Second processing module exports the variance of the K signals and the K signals of the luminous wick transmitting of the K layers, it is determined that
Go out first function and second function；
Driving power module is calculated, for distinguishing according to the first function, the second function and default bit error rate
Calculate the driving power of N number of luminous wick；
Module is limited, for being not belonging to the light of the luminous wick of the K layers when the driving power of the luminous wick of the K layers
During electric transfer linearity scope, the driving power of the luminous wick of the K layers is limited in into the light according to the 3rd preset rules
In electric transfer linearity scope, using the driving power being limited in the opto-electronic conversion range of linearity as the K work(is driven
Rate.
Wherein, the acquisition function module includes：
First obtains unit, for being the default letter in the snr value of the communication channel of the luminous wick of the K layers
Make an uproar under ratio, according to the characteristic of channel of the communication channel of the luminous wick of the K layers, determine the Signal estimation unit output
The K signals Soft Inform ation estimated value
Wherein, eESE(xk(j)) be K signals j-th bit Soft Inform ation estimated value, y (j) represent through the K layer electroluminescent lamps
J-th bit of the K signals of the Signal estimation unit output, x after the traffic channel of corekJ () represents K letters
Number j-th bit,Represent the direct current component of signal in NRZ-OOK；βkRepresent K driving powers, heoekFor K layers
The characteristic of channel of the communication channel of luminous wick,Refer to the one pole for sending the luminous wick of the K layers
Property K signals are changed into bipolarity K signals；ζk(j)-E[ζk(j)] it is that carrying for the luminous wick transmission of the kth layer is described
The distorted portion of the optical signal of K signals, ζkJ () is the optical signal for carrying the K signals that the luminous wick of kth layer sends
Interference signal value and noise signal value sum, E [ζk(j)] it is ζk(j) meansigma methodss, V [ζk(j)] it is ζk(j) variance；
Second obtaining unit, for exporting the K signals and the K layer electroluminescent lamps according to the Second processing module
The K signals of core transmitting, calculate the variance V [x of the K signals and the K signals of the luminous wick transmitting of the K layersk
(j)]=E{xk(j)-E[xk(j)]}2=E[xk(j)]-{E[xk(j)]}2, wherein, lESEFor the K numbers of decoding unit output
According to Soft Inform ation estimated value；
3rd obtaining unit, for the optical signal for carrying the K signals sent according to the luminous wick of the K layers
Interference signal and noise signal varianceδ2Refer to the noise signal
Variance, the letter for calculating the luminous wick of K layers is dried ratio
First function unit is obtained, for according to the electricity of the coded method of the coding module and N number of luminous wick
Light conversion method determines f (), and according to the letter of the luminous wick of the K layers ratio is dried, and obtains first function
Second function unit is obtained, for according to the electricity of the coded method of the coding module and N number of luminous wick
Light conversion method determines g (), according to bit error rate BER, obtains second function BER=g (SINRk)。
Wherein, the calculating driving power module includes：
First computing unit, for according to the default bit error rates of the luminous corresponding K of wick of the K layers and described the
Two functions, calculate the corresponding letter drying of the luminous wick of the K layers and compare SINRk, according to the SINRkAnd first letter
Number, calculates the variance of the luminous wick signal of the K layers
Second computing unit, for according to the first driving power of the luminous wick of the ground floor that pre-sets, describedAndCalculate the driving power of the luminous wick of K layers.
Wherein, also include：
Control brightness module, for being indicated according to the regulation brightness that receives, according to predetermined linear is regular and the K
The electro-optic conversion range of linearity of the luminous wick of layer, adjusts the driving power of the luminous wick of the K layers.
Understand via above-mentioned technical scheme, compared with prior art, embodiments provide a kind of visible ray and lead to
Letter system, is that the luminous wick of N number of transmission optical signal is respectively allocated a driving power, because Second processing module can be according to N
The corresponding relation of individual luminous wick and the driving power being respectively allocated for N number of luminous wick, determines with the from N number of signal
The luminous wick of the corresponding K layers of K signals of K driving powers, according to the second preset rules pair corresponding with the first preset rules
K signals are processed, and obtain K data corresponding with K signals, and the K signals sent according to the luminous wick of K layers exist
The N number of data for obtaining can be combined into the data signal, even if so N number of luminous wick by the positional information of data signal
Optical signal is sent simultaneously, and Second processing module can also make a distinction, such that it is able to parse correct data signal.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can be with basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of structural representation of visible light communication system provided in an embodiment of the present invention；
Fig. 2 is a kind of implementation of first processing module in a kind of visible light communication system provided in an embodiment of the present invention
Structural representation；
Fig. 3 is a kind of detailed structural representation of visible light communication system transmitting terminal provided in an embodiment of the present invention；
Fig. 4 is that the driving power of luminous wick in visible light communication system provided in an embodiment of the present invention exchanges schematic diagram；
Fig. 5 is a kind of implementation of Second processing module in a kind of visible light communication system provided in an embodiment of the present invention
Structural representation；
Fig. 6 is a kind of structural representation of receiving terminal provided in an embodiment of the present invention；
Fig. 7 is the one of the driving power that each luminous wick is calculated in visible light communication system provided in an embodiment of the present invention
Plant the structural representation of implementation；
Fig. 8 is the static non linear characteristic schematic diagram of light emitting diode；
Fig. 9 is a kind of implementation that function module is obtained in a kind of visible light communication system provided in an embodiment of the present invention
Structural representation；
Figure 10 is that one kind of calculating driving power module in a kind of visible light communication system provided in an embodiment of the present invention is real
The structural representation of existing mode.
Specific embodiment
For the sake of quoting and understanding, the explanation of the technical term for hereinafter using, write a Chinese character in simplified form or abridge and be summarized as follows：
OOK：On-Off Keying, binary switch keying.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The basic thought of the embodiment of the present invention is：Data signal is sent based on visible light communication technology, using same lamp
Multiple luminous wick in tool sends the optical signal for carrying data signal simultaneously.It is understood that multiple luminous wicks are same
When send optical signal, it may appear that optical signal superposition phenomenon.Transmitting terminal can be according to the electro-optic transfer characteristic of each luminous wick
And binary switch keying OOK modulating characteristics, distribute different driving powers to this multiple luminous wick respectively, that is, it is carried in
Driving power on each luminous wick is different, and such receiving terminal can distinguish which which optical signal corresponds to according to driving power
Luminous wick, the information that the optical signal for further being sent by each luminous wick is carried is believed in the position of above-mentioned data signal
Breath, receiving terminal can just reduce the data signal, so as to realize the purpose by multiple luminous wick transmission data signals.
Accompanying drawing 1 is referred to, is a kind of structural representation of visible light communication system provided in an embodiment of the present invention, this is visible
Optical communication system includes：M luminous wick 1011 is to 101M, receiver module 102, first processing module 103, power distribution module
104th, drive module 105, photoelectric conversion module 106, broadband acquisition module 107 and Second processing module 108, wherein：
M luminous wicks 1011 are to 101M.
M is the positive integer more than or equal to 2.
Luminous wick can be the LED of illumination, or fluorescent lamp, or light emitting diode.
Receiver module, for receiving data signal waiting for transmission.
Receiver module can simultaneously receive multiple data signals, and each luminous wick can correspond to a data signal, for example,
Receiver module can simultaneously receive the first data signal, the second data signal and the 3rd data signal, and lighting wick 1011 can be with
Corresponding with the first data signal, lighting wick 1012 can be corresponding with the second data signal, and lighting wick 1013 can be with the 3
Data signal correspondence, certain receiver module can receive a data signal, at this moment data signal can be converted to into parallel letter
Number.
Above-mentioned data signal includes N number of data, and N is the positive integer more than or equal to 1 less than or equal to M.For example data signal is
100110, above-mentioned data signal 100110 can include 6 data, and this 6 data can be respectively：1、0、0、1、1、0.Also may be used
So that including 3 data, this 3 data can be respectively 10,01,10.Because data signal is divided into several data, this is not affected
Inventive embodiments are implemented, so here is not especially limited.Generally, data signal includes several data, just
The several luminous wicks of correspondence.
First processing module 102, for being processed K data in N number of data according to the first preset rules, will be processed
K data afterwards carries out binary switch keying OOK modulation, obtains K signals corresponding with K data.
K=1,2 ..., N.
First processing units 102 can be modulation panel.
It is not little that binary switch keying OOK modulation refers to that the K data after processing according to the first preset rules is modulated to
In zero signal, such as K data is 10 in above-mentioned data signal, and the first preset rules are：1 correspondence 1；0 correspondence 0, then
Symbol data after K data is processed according to the first preset rules is 001011, and above-mentioned binary switch keying OOK can
To refer to signal modulation in code element 001011 as 001011.
First preset rules can be not default to first for pre-arranged code rule, default computation rule, the embodiment of the present invention
Rule is specifically limited.Default computation rule may refer to for K data to carry out the addition subtraction multiplication and division computing that letter is answered.
Power distribution module 103, for according to the characteristic of channel of the communication channel of K signals, being K signals corresponding
The luminous wick distribution K driving powers of K layers.
Communication channel can be each components and parts for the light space and receiving terminal for transmitting optical signal.The channel of communication channel is special
Property can be the characteristic of each components and parts of transmitting terminal, above-mentioned smooth space and receiving terminal.Light space and each yuan of device of receiving terminal
The characteristic of part can be obtained by testing, you can with by a known signal（It is properly termed as original known signal）By above-mentioned reception
A module 102, first processing module 103, power distribution module 104, drive module 105, M luminous wick 1011 is to 101M, light
After electric modular converter 106, broadband acquisition module 107 and Second processing module 108, the known signal is obtained（Can be described as receiving
Known signal）, the characteristic of above-mentioned communication channel can be obtained from original known signal and the feature of reception known signal.
Transmitting terminal includes：Receiver module 102, first processing module 103, power distribution module 104, drive module 105, M
Individual luminous wick 1011 is to 101M.
Receiving terminal includes：Photoelectric conversion module 106, broadband acquisition module 107 and Second processing module 108.
Mould 104 is driven, for according to K driving powers, driving the luminous wick of K layers to send the light for carrying K signals
Signal.
Photoelectric conversion module 106, for the optical signal that the N number of luminous wick for receiving sends to be converted to into the signal of telecommunication.
Photoelectric conversion module 106 can be photodiode PD.
Broadband acquisition module 107, for obtaining N number of signal that N number of luminous wick sends from above-said current signal.
Second processing module 107, for according to N number of luminous wick and the driving power being respectively allocated for N number of luminous wick
Corresponding relation, determine that the corresponding K layers of K signals with K driving powers light wick from N number of signal, according to
The second preset rules corresponding with the first preset rules are processed K signals, obtain K data corresponding with K signals,
According to the K signals of the luminous wick transmission of K layers in the positional information of above-mentioned data signal, the N number of data for obtaining are combined into
The data signal.
A kind of visible light communication system is embodiments provided, is that the luminous wick of N number of transmission optical signal divides respectively
With a driving power, because Second processing module can be according to N number of luminous wick and the driving being respectively allocated for N number of luminous wick
The corresponding relation of power, determines that the corresponding K layers of K signals with K driving powers light wick from N number of signal,
K signals are processed according to the second preset rules corresponding with the first preset rules, obtains K corresponding with K signals
Data, and the K signals of the luminous wick transmission of foundation K layers are in the positional information of data signal, the N number of data that can be obtained
The data signal is combined into, even if so N number of luminous wick is while send optical signal, Second processing module can also carry out area
Point, such that it is able to parse correct data signal.
Fig. 2 is referred to, is one kind of first processing module in a kind of visible light communication system provided in an embodiment of the present invention
The structural representation of implementation, the first processing module can include：Coding unit 201, interleave unit 202 and OOK modulation
Unit 203, wherein：
Coding unit 201, for being encoded for K data.
Coding unit 201 can be encoder.
Interleave unit 202, for the K data after the coding that exports to coding unit 201 modulation is interleaved.
Interleave unit 202 can be interleaver.K data after the coding that interleaver can export coding unit 201
Carry out being exported from front to back after random permutation.
OOK modulating units 203, for the K data after the intertexture that exports to interleave unit 202 binary switch key is carried out
Control OOK modulation, obtains K signals corresponding with K data.
In order to those skilled in the art more understand the embodiment of the present invention, the detailed structure that transmitting terminal is explained below is shown
It is intended to, refers to Fig. 3, is a kind of detailed structural representation of visible light communication system transmitting terminal provided in an embodiment of the present invention.
Visible light communication system transmitting terminal includes coding unit 201, interleave unit 202, OOK modulating units 203, power distribution module
104th, drive module 105 and luminous wick 1011 are to 101N.
Transmitting terminal can also include serioparallel exchange unit 204, for serial signal to be converted to into parallel signal, if received
The data signal that module is received is parallel signal, then transmitting terminal can not include serioparallel exchange unit.Due to each optical signal
It is superposed transmission when being transmitted, for the more vivid mode for illustrating optical signal superposed transmission, also draws in Fig. 3
Superposed transmission module 205, but it is in actual applications not the presence of superposed transmission module 205.In the embodiment of the present invention
Transmitting terminal in visible light communication system can also include AD conversion unit 301, for converting analog signals into digital letter
Number.
Assume that data signal u waiting for transmission includes N number of data, this N number of data is respectively u1..., uK..., uN, wherein,
uKThe signal to be sent with the luminous wick of K layers is corresponding, and K is the positive integer more than or equal to 1 less than or equal to N.
U is shown in Fig. 31..., uK..., uN, uNEncoded unit 201 exports c after encodingNSignal, cNSignal Jing
Cross after interleave unit 202 is replaced and export vNSignal, vNSignal carries out exporting x after OOK modulating units 203 are modulatedNSignal, uKThrough
Coding unit 201 exports c after encodingKSignal, cKSignal exports v after the displacement of interleave unit 202KSignal, vKSignal is carried out
OOK modulating units 203 export x after modulatingKSignal, u1Encoded unit 201 exports c after encoding1Signal, c1Signal is through handing over
Knit after unit 202 is replaced and export v1Signal, v1Signal carries out exporting x after OOK modulating units 203 are modulated1Signal.Each in Fig. 3
Luminous wick is represented with LED.
From figure 3, it can be seen that power distribution module 104 is divided into for β for the driving power of each LED distributionN...,
βk..., β1, the optical signal that each LED sends is respectively sN..., ..., s1.Allow optical signal s if desiredkIn carry xK
Signal, then need xKSignal carries out base electrical signal process, by xKSignal is adjusted to optical signal skIn.Now LED sends
Optical signal is analogue signal.So corresponding, receiving terminal can include an AD conversion unit, for converting analog signals into
Digital signal.
The distribution of driving power necessarily causes some luminous wicks in high level, some luminous wicks in low level,
If luminous wick is chronically at high level, the lost of life of luminous wick, above-mentioned M luminous wick can be made to be and have
The luminous wick of same size parameter, when the fluorescent lifetime of luminous wick reaches certain hour, can be by each luminous wick
Driving power exchange, so luminous wick will not be constantly in high level state, can extend the life-span of luminous wick.This
The first processing module that bright embodiment is provided can also include：Driving power unit is changed, for when Preset Time arrives, inciting somebody to action
The driving power of the luminous wick of L layers is set to the driving power of the luminous wick of F layers in N number of luminous wick, and wherein L ≠
F, L and F are more than or equal to 1 and less than or equal to N.
Fig. 4 is referred to, is that the driving power of luminous wick in visible light communication system provided in an embodiment of the present invention is exchanged
Schematic diagram.
Luminous wick L, luminous wick G, luminous wick B, luminous wick Q, " ... " table in figure are merely illustrated in figure
Show other luminous wicks of omission.It is that the driving power of luminous wick L is distributed to into luminous wick F in figure, by luminous wick F's
Driving power distributes to luminous wick G, and the driving power of luminous wick G is distributed to into luminous wick B ..., by electroluminescent lamp
The driving power of core Q distributes to luminous wick L.
Wherein, F ≠ G, G ≠ B, Q ≠ L.G, B, Q are the positive integer more than or equal to 1 less than or equal to N.
Transmitting terminal distributes a driving power for each luminous wick, and receiving terminal knows that luminous wick is corresponding with driving power
The mode of relation has various, for example, can be the corresponding relation to be sent to receiving terminal, now present invention enforcement by transmitting terminal
First processing module can also include in the visible light communication system that example is provided：Indicating member is generated, in N number of luminous wick
Before optical signal is sent, after the driving power that N number of luminous wick is set, generate first and indicate, the first instruction includes N number of
The K letters that luminous wick sends with the luminous wick of the corresponding relation and K layers of the driving power being respectively allocated for N number of luminous wick
Number data signal positional information；Accordingly, the Second processing module in receiving terminal specifically for：In indicating according to first
N number of luminous wick and the corresponding relation of the driving power being respectively allocated for N number of luminous wick, determine have from N number of signal
The luminous wick of the corresponding K layers of K signals of K driving powers, according to the second preset rules corresponding with the first preset rules
K signals are processed, K data corresponding with K signals is obtained, the luminous wick of the K layers in indicating according to first is sent out
The K signals for sending data signal positional information, will obtain N number of data set generated data signal.
Transmitting terminal distributes a driving power for each luminous wick, and receiving terminal knows that luminous wick is corresponding with driving power
The mode of relation has various, for example, can store above-mentioned N number of luminous wick and divide for above-mentioned N number of luminous wick in receiving terminal in advance
The corresponding relation of the driving power do not distributed, and the K signals of the luminous wick transmission of above-mentioned K layers are prestored in above-mentioned number
It is believed that number positional information.Second processing module in visible light communication system so provided in an embodiment of the present invention can have
Body is used for：According to the N number of luminous wick for prestoring and the corresponding relation for being the driving power that N number of luminous wick is respectively allocated,
Determine that the corresponding K layers of K signals with K driving powers light wick from N number of signal, according to the first default rule
Then corresponding second preset rules are processed K signals, obtain K data corresponding with K signals, and foundation is prestored
The K signals that send of the luminous wick of K layers data signal positional information, by the N number of data set composite number for obtaining it is believed that
Number.
If when Preset Time arrives, the driving power of each luminous wick will be exchanged, then receiving terminal can be advance
Be stored with Preset Time, and above-mentioned N number of luminous wick pass corresponding with the driving power being respectively allocated for above-mentioned N number of luminous wick
System, and prestore the positional information of the K signals in above-mentioned data signal of the luminous wick transmission of above-mentioned K layers.The present invention
Second processing module in the visible light communication system that embodiment is provided can be specifically for：It is above-mentioned default according to what is prestored
Time, and above-mentioned N number of luminous wick and the corresponding relation for being the driving power that above-mentioned N number of luminous wick is respectively allocated, from above-mentioned N
Determine that current time has the luminous wick of the corresponding K layers of K signals of above-mentioned K driving powers in individual signal, according to
Corresponding second preset rules of first preset rules are processed above-mentioned K signals, obtain corresponding with above-mentioned K signals the
K data, according to the K signals of the luminous wick transmission of above-mentioned K layers are prestored in the positional information of above-mentioned data signal, will obtain
The above-mentioned N number of data for obtaining are combined into above-mentioned data signal.
If when Preset Time arrives, the driving power of each luminous wick will be exchanged, then transmitting terminal can be by this
The corresponding relation of Shi Faguang wicks and driving power is sent to receiving terminal, now visible light communication system provided in an embodiment of the present invention
First processing module in system can also include：Second generates indicating member, for changing driving power unit by L layers
The driving power of luminous wick is set to after the driving power of luminous wick of F layers, is generated second and is indicated, above-mentioned second indicates
Including when top n electroluminescent lamp core and the corresponding relation of the driving power being respectively allocated for above-mentioned N number of luminous wick, and above-mentioned K
Positional information of the K signals that the luminous wick of layer sends in above-mentioned data signal.Now Second processing module specifically for：Foundation
Above-mentioned N number of luminous wick pass corresponding with the driving power being respectively allocated for above-mentioned N number of luminous wick in above-mentioned second instruction
System, determines that the corresponding K layers of K signals with above-mentioned K driving powers light wick from above-mentioned N number of signal, according to
The second preset rules corresponding with the first preset rules are processed above-mentioned K signals, are obtained corresponding with above-mentioned K signals
K data, the K signals that the luminous wick of the above-mentioned K layers in indicating according to above-mentioned second sends are in the position of above-mentioned data signal
Confidence ceases, and the above-mentioned N number of data for obtaining are combined into into above-mentioned data signal.
Fig. 5 is referred to, is one kind of Second processing module in a kind of visible light communication system provided in an embodiment of the present invention
The structural representation of implementation, the Second processing module includes：Signal estimation unit 501, deinterleaving unit 502 and decoding are single
Unit 503, wherein：
Signal estimation unit 501, for being respectively allocated according to above-mentioned N number of luminous wick and above-mentioned N number of luminous wick
The corresponding relation of driving power, from above-mentioned N number of signal the corresponding K of K signals with above-mentioned K driving powers is determined
The luminous wick of layer, the K signals sent according to the luminous wick of above-mentioned K layers, will be above-mentioned in the positional information of above-mentioned data signal
K signals are sent to deinterleaving unit 502.
Signal estimation unit 501 can be signal estimator.
Unit 502 is deinterleaved, for being deinterleaved modulation for above-mentioned K signals.
It can be deinterleaver to deinterleave unit 502, and the deinterleaving unit 502 can be right with above-mentioned interleave unit 202
Answer.
Decoding unit 503, the signal for deinterleaving unit output for above-mentioned K is decoded, and obtains K data.
Decoding unit 503 can be decoder, and decoding unit 503 can be corresponding with coding unit 201.
In order to those skilled in the art more understand receiving terminal in visible light communication system provided in an embodiment of the present invention
Structure, is explained below a kind of structural representation of receiving terminal.Fig. 6 is referred to, is a kind of reception provided in an embodiment of the present invention
The structural representation at end.Receiving terminal includes that photoelectric conversion module 106, broadband acquisition module 107, Signal estimation unit 501, solution are handed over
Knit unit 502 and decoding unit 503.
If transmitting terminal is that a data signal is converted into into multiple parallel signal transmission, then receiving terminal is accomplished by one
Parallel serial conversion unit 601, for parallel signal to be converted to into serial signal.Because the optical signal that the wick that lights sends is simulation letter
Number.So receiving terminal can include an AD conversion unit 602, for converting analog signals into digital signal.
Photoelectric conversion module 106 is represented in Fig. 6 with photodiode PD.The operation principle of PD is to detect the illumination on its surface
Intensity, in order that the optical signal of superposition that transmitting terminal sends is gathered in the surface of PD, can arrange condenser lenss on PD surfaces, and
Condenser lenss lower section arranges filter lenss, and the optical signal of the superposition that condenser lenss can send transmitting terminal is gathered in the surface of PD, filters
Mirror can filter the light being gathered in the optical signal on PD surfaces in addition to blue light, so that what the more preferable receiving end/sending ends of PD sent
Optical signal.Certainly PD surfaces can also be not provided with condenser lenss and filter lenss.
Assume that data signal u waiting for transmission includes N number of data, this N number of data is respectively u1..., uK..., uN, wherein,
uKThe signal to be sent with the luminous wick of K layers is corresponding, and K is the positive integer more than or equal to 1 less than or equal to N.
The superposed signal of the N number of optical signal for receiving is converted to the signal of telecommunication by PD, and broadband acquisition module 107 is from above-mentioned telecommunications
Gather the signal carried in N number of optical signal in number respectively（N number of signal is gathered altogether）, broadband gathers mould by AD conversion unit 602
N number of signal of the collection of block 107 is converted into digital signal, Signal estimation unit 501 according to above-mentioned N number of luminous wick be above-mentioned N
The corresponding relation of the driving power that individual luminous wick is respectively allocated, determines from N number of signal of the collection of broadband acquisition module 107
K signal x with above-mentioned K driving powerskCorresponding K layers light wick, and by K signal xkSend to corresponding solution
Interleave unit 502, deinterleaves unit 502 by xkC is exported after deinterleavingkSignal, decoding unit 503 is by ckAfter signal is decoded
Output uk.Wherein, K=1,2,3 ..., N.Then the K signals for sending according to the luminous wick of above-mentioned K layers are believed in above-mentioned data
Number position letter by parallel serial conversion unit 601 by u1..., uK..., uNIt is combined into above-mentioned data signal.
Driving power calculation is according to the electro-optic conversion nonlinear characteristic of each luminous wick in the embodiment of the present invention
And OOK modulating characteristics, under the conditions of the default bit error rate of characteristic of channel satisfaction of communication channel, calculate K layer electroluminescent lamps
The driving power of core, then again according to front K layers luminous wick driving power, calculate the driving of the luminous wick of K+1 layers
Power.Calculating the mode of the driving power of each luminous wick has various, refers to Fig. 7, be it is provided in an embodiment of the present invention can
A kind of structural representation of implementation of the driving power for calculating each luminous wick is seen in optical communication system, it is seen that optic communication
System can include：Determining module 701, acquisition function module 702, calculating driving power module 703 and restriction module 704,
Wherein：
Determining module 701, for determining the characteristic of channel of the communication channel of the luminous wick of K layers.
Function module 702 is obtained, for being default snr value in the snr value of the communication channel of the luminous wick of K layers
Under, according to the characteristic of channel of the communication channel of the luminous wick of K layers, determine the soft of the K signals that Signal estimation unit is exported
Information estimated value, Soft Inform ation estimated value, the bit error rate of the K signals and Second processing module output K according to K signals
The variance of signal and the K signals of the luminous wick transmitting of K layers, determines first function and second function.
The Soft Inform ation estimated value of K signals refers to the probability that K signals are 1 or 0.
Driving power module 703 is calculated, for calculating respectively according to first function, second function and default bit error rate
State the driving power of N number of luminous wick.
Module 704 is limited, the photoelectricity for being not belonging to the luminous wick of K layers when the driving power of the luminous wick of K layers turns
When changing the range of linearity, the driving power of the luminous wick of K layers is limited in into the linear model of opto-electronic conversion according to the 3rd preset rules
In enclosing, using the driving power being limited in the opto-electronic conversion range of linearity as K driving powers.
The electro-optic transfer characteristic of luminous wick has nonlinear characteristic, enters so that luminous wick is as light emitting diode as an example below
Row explanation, refers to Fig. 8, is the static non linear characteristic schematic diagram of light emitting diode.
As can be seen from Figure 8, the range of linearity of LED is very narrow, for example LED (OSRAM, LW_W5AM_
KXLX_5K8L the range of linearity) is that the range of linearity only has 1V between 2.7～3.7V.Therefore practical communication is needed with reference to non-linear
Characteristic is studied, the non-linear dynamic range that not only limit signal, and also the driving power of each luminous wick can be distributed
Bring impact.Due to LED driving voltage non-negative, therefore LED adopts OOK modulation systems in the present invention.Everybody believes i.e. in K signals
Number non-negative.Need that the driving voltage of each light emitting diode is limited in the range of linearity in the embodiment of the present invention, due to driving
Power be driving voltage square, it is possible to according to driving voltage obtain driving power scope.
As can be seen from Figure 8 LED cut-in voltages are Vstart, saturation voltage is Vend, the requirement of driving power distribution is will
So that drive voltage range is Vstart≤V≤Vend.That is, driving power is more than VendWhen, by its amplitude limit, less than VstartWhen,
LED can not be driven to light.
For example, a certain LED cut-in voltages are 0.7V, and saturation voltage is 1.7V, then the range of linearity of its driving power is
0.49 to 2.89, if the driving power of the LED for calculating is 3, the driving power of the LED can be carried out simple linear
Computing, so that result of calculation belongs to 0.49 to 2.89, such as linear operation is to allow driving power to be multiplied by 1/3, then the LED for obtaining
Driving power be 1.
Fig. 9 is referred to, is one kind that function module is obtained in a kind of visible light communication system provided in an embodiment of the present invention
The structural representation of implementation, obtaining function module includes：First obtains unit 901, the second obtaining unit the 902, the 3rd are obtained
Unit 903 is obtained, first function unit 904 is obtained and obtains second function unit 905, wherein：
First obtains unit 901, for presetting for above-mentioned in the snr value of the communication channel of the luminous wick of above-mentioned K layers
Under snr value, according to the characteristic of channel of the communication channel of the luminous wick of above-mentioned K layers, determine that above-mentioned Signal estimation unit is defeated
The Soft Inform ation estimated value of the above-mentioned K signals for going out
Wherein, eESE(xk(j)) be K signals j-th bit Soft Inform ation estimated value, y (j) represent through above-mentioned K
J-th bit of the above-mentioned K signals of above-mentioned Signal estimation unit output, x after the traffic channel of the luminous wick of layerk(j)
J-th bit of K signals is represented,Represent the direct current component of signal in NRZ-OOK；βkK driving powers are represented,
heoekThe characteristic of channel of the communication channel of wick that lights for K layers,Refer to above-mentioned K layer electroluminescent lamps
The unipolarity K signals that core sends are changed into bipolarity K signals.ζk(j)-E[ζk(j)] it is that the luminous wick of above-mentioned K layers sends
The optical signal for carrying above-mentioned K signals distorted portion, ζk(j) be the luminous wick of K layers send carry above-mentioned K
The interference signal value and noise signal value sum of the optical signal of signal, E [ζk(j)] it is ζk(j) meansigma methodss, V [ζk(j)] it is ζk(j)
Variance.
Assume that K signals are 0111, then the first bit of K signals is 0, the second bit is 1, the 3rd bit is the 1, the 4th
Bit is 1.
The process for calculating Soft Inform ation estimated value is as follows：
Second obtaining unit 902, sends out for exporting above-mentioned K signals according to above-mentioned Second processing module with above-mentioned K layers
The K signals of light wick transmitting, calculate variance V of above-mentioned K signals and the K signals of the luminous wick transmitting of above-mentioned K layers
[xk(j)]=E{xk(j)-E[xk(j)]}2=E[xk(j)]-{E[xk(j)]}2。
Wherein, lESEFor the Soft Inform ation estimated value of the K data of above-mentioned decoding unit output.
E[xk(j)] be K layers j-th signal
Average.V[xk(j)] for kth layer j-th signal variance, because l when initialESEWithout prior information, it is possible to arrange E
[xk(j)]=0.5, V [xk(j)]=0.25。
When solving the driving power of the luminous wick of K layers, by the approximate K layers of the sampled value of receiving terminal adjacent interference and make an uproar
Variance V [the ζ of soundk(j)] it is as follows：
It is one groupAverage,
And VζkIt is one groupAverage, J is the frame length of data signal, noise average power can be approximately into Vζk。
3rd obtaining unit 903, for the light for carrying above-mentioned K signals sent according to the luminous wick of above-mentioned K layers
The interference signal of signal and the variance of noise signalδ2Refer to above-mentioned noise letter
Number variance, the letter for calculating the luminous wick of K layers is dried ratio
The letter of the luminous wick of K layers is dried ratio：
Assume transmitting terminal xk(j)=1 and xkThe equal-probability distribution of (j)=0, then
First function unit 904 is obtained, for according to the coded method of above-mentioned coding module and above-mentioned N number of luminous wick
Electro-optic conversion method determines f (), and according to the letter of the luminous wick of above-mentioned K layers ratio is dried, and obtains first function
Assume transmitting terminal xk(j)=1 and xkThe equal-probability distribution of (j)=0, then varianceIt is input SINRkFunction：
Second function unit 905 is obtained, for according to the coded method of above-mentioned coding module and above-mentioned N number of luminous wick
Electro-optic conversion method determines g (), according to above-mentioned bit error rate BER, obtains second function BER=g (SINRk)。
After iteration terminates, final bit error rate BER can also be obtained by g () function, bit error rate（bit
Error ratio, BER）It is also SINRkFunction：BER=g(SINRk), f () and g () function can be by single wicks
LED electro-optic conversions nonlinear system carries out Monte Carlo emulation and obtains.F () only with the coding unit of transmitting terminal and light
The electro-optic transfer characteristic of wick is relevant.G () is only and the coded system of the coding unit of transmitting terminal that used and luminous wick
Electro-optic transfer characteristic it is relevant.
Figure 10 is referred to, is calculating driving power module in a kind of visible light communication system provided in an embodiment of the present invention
A kind of structural representation of implementation, calculating driving power module can include：First computing unit 1001 and second is calculated
Unit 1002, wherein：
First computing unit 1001, for according to the default bit error rates of the luminous corresponding K of wick of above-mentioned K layers and the
Two functions, calculate the corresponding letter drying of the luminous wick of above-mentioned K layers and compare SINRk, according to above-mentioned SINRkAnd first function, meter
Calculate the variance of the luminous wick signal of above-mentioned K layers
Second computing unit 1002, the first driving power of the luminous wick of above-mentioned ground floor pre-set for basis,
It is above-mentionedAndCalculate the driving work(of the luminous wick of K layers
Rate.
Highest bit error rate BER of setting is actually needed according to communicationmaxI.e.（Above-mentioned BER）, then according to g () function,
There is a corresponding Signal to Interference plus Noise Ratio SINRequal=g-1(BERmax).Find one group of power
So that its summation minimum and power bracket as far as possible is in the range of LED linear, that is,
And after Q iteration, the Signal to Interference plus Noise Ratio of each luminous wick is not less than required SINRequal, also
I.e.Under conditions of setting BER, successively found using the infinite searching algorithm of recurrence.D layers (0 before assuming<K<
D) met in setting BERmax(such as BER≤10-4) the distribution of work(driving rate, then pass through emulation and determine K+1 layers full
Sufficient BERmaxWhen driving power βk+1.This scheme be adapted to luminous wick number it is less when driving power distribution, single illuminating lamp
General LED numbers can meet needs at 3～6 based on the recursive search algorithm of emulation in tool.Wherein, by SINR evolution
Method is obtainedValue：
Characterize the Signal to Interference plus Noise Ratio of the q time iteration output ground ESE of kth layer, initial valueF when final
(∞)=0。
Can also include in any of the above-described visible light communication system embodiment：Control brightness module, receives for basis
Regulation brightness indicate, the electro-optic conversion range of linearity of and above-mentioned K layer luminous wick regular according to predetermined linear, in regulation
State the driving power of the luminous wick of K layers.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation is all difference with other embodiment, between each embodiment identical similar part mutually referring to.
For device or system class embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, it is related
Part is illustrated referring to the part of embodiment of the method.
Also, it should be noted that herein, such as first and second or the like relational terms are used merely to one
Entity or operation make a distinction with another entity or operation, and not necessarily require or imply between these entities or operation
There is any this actual relation or order.And, term " including ", "comprising" or its any other variant are intended to contain
Lid nonexcludability is included, so that a series of process, method, article or equipment including key elements not only will including those
Element, but also including other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element for being limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The step of method described with reference to the embodiments described herein or algorithm, directly can be held with hardware, processor
Capable software module, or the combination of the two is implementing.Software module can be placed in random access memory（RAM）, internal memory, read-only deposit
Reservoir（ROM）, electrically programmable ROM, electrically erasable ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technology
In field in known any other form of storage medium.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (10)
1. a kind of visible light communication system, it is characterised in that include：
M luminous wick, M is the positive integer more than or equal to 2；
Receiver module, for receiving data signal waiting for transmission, the data signal includes N number of data, the N be more than or equal to
1 and the positive integer less than or equal to M；
First processing module, for being processed K data in N number of data according to the first preset rules, after process
The K data carry out binary switch keying OOK modulation, obtain corresponding with K data K signals, the K=
1,2 ..., N；
Power distribution module, for according to the characteristic of channel of the communication channel of the K signals, being that the K signals are corresponding
The luminous wick distribution K driving powers of K layers；
Drive module, for according to the K driving powers, driving the luminous wick of the K layers to send the K letters are carried
Number optical signal；
Photoelectric conversion module, for the optical signal that the N number of described luminous wick for receiving sends to be converted to into the signal of telecommunication；
Broadband acquisition module, for obtaining N number of signal that N number of luminous wick sends from the signal of telecommunication；
Second processing module, for according to N number of luminous wick and the driving power being respectively allocated for N number of luminous wick
Corresponding relation, the corresponding K layer electroluminescent lamps of K signals with the K driving powers are determined from N number of signal
Core, is processed the K signals according to the second preset rules corresponding with first preset rules, is obtained and described the
The corresponding K data of K signals, the K signals sent according to the luminous wick of the K layers are believed in the position of the data signal
The described N number of data for obtaining are combined into the data signal by breath.
2. visible light communication system according to claim 1, it is characterised in that the first processing module includes：
Coding unit, for being encoded for the K data；
Interleave unit, for the K data after the coding that exports to the coding unit modulation is interleaved；
OOK modulating units, for the K data after the intertexture that exports to the interleave unit binary switch keying is carried out
OOK is modulated, and obtains K signals corresponding with the K data.
3. visible light communication system according to claim 1 or claim 2, it is characterised in that the M luminous wick is and has
The luminous wick of same size parameter, the first processing module also includes：
Driving power unit is changed, for when Preset Time arrives, by the luminous wick of L layers in N number of luminous wick
Driving power be set to F layers luminous wick driving power, wherein L ≠ F, L and F be more than or equal to 1 and less than etc.
In N.
4. visible light communication system according to claim 1 or claim 2, it is characterised in that the first processing module also includes：
Indicating member is generated, before optical signal is sent, N number of luminous wick is being set in N number of luminous wick
Driving power after, generate first indicate, it is described first indicate include N number of luminous wick be N number of electroluminescent lamp
The K signals that the corresponding relation of the driving power that core is respectively allocated and the luminous wick of the K layers send are in the data signal
Positional information；
Accordingly, the Second processing module specifically for：Described N number of luminous wick in indicating according to described first with for institute
The corresponding relation of the driving power that N number of luminous wick is respectively allocated is stated, is determined from N number of signal and is driven with the K
The luminous wick of the corresponding K layers of K signals of dynamic power, according to the second preset rules pair corresponding with first preset rules
The K signals are processed, and obtain corresponding with K signals K data, described the in indicating according to described first
The described N number of data for obtaining are combined into institute by the K signals that the luminous wick of K layers sends in the positional information of the data signal
State data signal.
5. visible light communication system according to claim 1 or claim 2, it is characterised in that the Second processing module specifically for：
The Preset Time that foundation is prestored, and N number of luminous wick and the driving power being respectively allocated for N number of luminous wick
Corresponding relation, determine that current time has the corresponding K of K signals of the K driving powers from N number of signal
The luminous wick of layer, is processed the K signals according to the second preset rules corresponding with first preset rules, is obtained
K data corresponding with the K signals, foundation prestores the K signals of the luminous wick transmission of the K layers in the number
It is believed that number positional information, by obtain described N number of data be combined into the data signal.
6. visible light communication system according to claim 2, it is characterised in that the Second processing module includes：
Signal estimation unit, for according to N number of luminous wick and the driving power being respectively allocated for N number of luminous wick
Corresponding relation, the corresponding K layer electroluminescent lamps of K signals with the K driving powers are determined from N number of signal
Core, the K signals sent according to the luminous wick of the K layers the data signal positional information, by the K signals
Send to deinterleaving unit；
The deinterleaving unit, for being deinterleaved modulation for the K signals；
Decoding unit, for being decoded for the K signals of the deinterleaving unit output, obtains K data.
7. visible light communication system according to claim 6, it is characterised in that also include：
Determining module, for determining the characteristic of channel of the communication channel of the luminous wick of the K layers；
Function module is obtained, under in the snr value of the communication channel of the luminous wick of the K layers for default snr value,
According to the characteristic of channel of the communication channel of the luminous wick of the K layers, the K of the Signal estimation unit output is determined
The Soft Inform ation estimated value of signal, the Soft Inform ation estimated value, the bit error rate of the K signals and institute according to the K signals
The variance that Second processing module exports the K signals of the K signals and the luminous wick transmitting of the K layers is stated, the is determined
One function and second function；Wherein, the Soft Inform ation estimated value refers to the probability that signal is 1 or 0；
Driving power module is calculated, for calculating respectively according to the first function, the second function and default bit error rate
The driving power of N number of luminous wick；
Module is limited, the photoelectricity for being not belonging to the luminous wick of the K layers when the driving power of the luminous wick of the K layers turns
When changing the range of linearity, the driving power of the luminous wick of the K layers is limited in into the photoelectricity according to the 3rd preset rules and is turned
In changing the range of linearity, using the driving power being limited in the opto-electronic conversion range of linearity as the K driving powers.
8. visible light communication system according to claim 7, it is characterised in that the acquisition function module includes：
First obtains unit, for being the default signal to noise ratio in the snr value of the communication channel of the luminous wick of the K layers
Under value, according to the characteristic of channel of the communication channel of the luminous wick of the K layers, the institute of the Signal estimation unit output is determined
State the Soft Inform ation estimated value of K signalsIts
In, eESE(xk(j)) be K signals j-th bit Soft Inform ation estimated value, xkJ () represents j-th bit of K signals,Represent the direct current component of signal in NRZ-OOK；βkRepresent K driving powers, heoekFor the logical of the luminous wick of K layers
The characteristic of channel of letter channel,Refer to and turn the unipolarity K signals that the luminous wick of the K layers sends
It is changed into bipolarity K signals；ζk(j)-E[ζk(j)] it is the light for carrying the K signals that the luminous wick of the kth layer sends
The distorted portion of signal, ζkJ () is the interference signal of the optical signal for carrying the K signals that the luminous wick of kth layer sends
Value and noise signal value sum, E [ζk(j)] it is ζk(j) meansigma methodss, V [ζk(j)] it is ζk(j) variance；
Second obtaining unit, sends out for exporting the K signals according to the Second processing module with the luminous wick of the K layers
The K signals penetrated, calculate the variance V [x of the K signals and the K signals of the luminous wick transmitting of the K layersk(j)]=
E{xk(j)-E[xk(j)]}2=E [xk(j)]-{E[xk(j)]}2；
3rd obtaining unit, for the dry of the optical signal for carrying the K signals that sent according to the luminous wick of the K layers
Disturb the variance of signal value and noise signal value sumδ2Refer to the noise signal
Variance, It is one groupAverage,It is one groupAverage, J
It is the frame length of data signal, calculates the Signal to Interference plus Noise Ratio of the luminous wick of K layers
First function unit is obtained, for turning with the electric light of N number of luminous wick according to the coded method of the coding unit
The method of changing determines f (), according to the Signal to Interference plus Noise Ratio of the luminous wick of the K layers, obtains first function
Second function unit is obtained, for turning with the electric light of N number of luminous wick according to the coded method of the coding unit
The method of changing determines g (), according to bit error rate BER, obtains second function BER=g (SINRk)。
9. visible light communication system according to claim 8, it is characterised in that the calculating driving power module includes：
First computing unit, for according to the default bit error rates of the corresponding K of the luminous wick of the K layers and second letter
Number, calculates the K layers corresponding Signal to Interference plus Noise Ratio SINR of luminous wickk, according to the SINRkAnd the first function, meter
Calculate the variance of the luminous wick signal of the K layers
Second computing unit, for according to the first driving power of the luminous wick of the ground floor that pre-sets, describedAndCalculate the driving power of the luminous wick of K layers.
10. the visible light communication system according to claim 1,6,7,8 or claim 9, it is characterised in that also include：
Control brightness module, it is regular according to predetermined linear and the K layers are sent out for being indicated according to the regulation brightness that receives
The electro-optic conversion range of linearity of light wick, adjusts the driving power of the luminous wick of the K layers.
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| CN103986516A (en) * | 2014-05-30 | 2014-08-13 | 中国人民解放军信息工程大学 | Visible light communication system and method |
| CN104022825A (en) * | 2014-06-21 | 2014-09-03 | 滁州惠智科技服务有限公司 | Indoor visible light communication system and method thereof |
| CN104022827A (en) * | 2014-06-30 | 2014-09-03 | 中国人民解放军信息工程大学 | Visible light communication system |
| CN104218990B (en) * | 2014-09-30 | 2017-04-12 | 中国人民解放军信息工程大学 | Visible light communication system and visible light communication method |
| CN104243034B (en) * | 2014-09-30 | 2017-03-08 | 中国人民解放军信息工程大学 | A kind of visible light communication system and visible light communication method |
| CN105187797B (en) * | 2015-09-15 | 2018-05-18 | 中国人民解放军信息工程大学 | A kind of visual light imaging communication means and device |
| CN107147598B (en) * | 2017-04-18 | 2019-08-30 | 东莞信大融合创新研究院 | A kind of underwater visible light communication methods, devices and systems |
| CN107104733B (en) * | 2017-05-02 | 2019-12-03 | 中国人民解放军信息工程大学 | A kind of data transmission method for uplink based on visible light communication, apparatus and system |
| CN107979417B (en) * | 2017-11-22 | 2019-09-06 | 重庆思柏高科技有限公司 | A kind of coding method of visible light communication and device |
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