CN102224691B - Visible light communication system, dispensing device and signaling method - Google Patents
Visible light communication system, dispensing device and signaling method Download PDFInfo
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Abstract
Disclosing a kind of visible light communication system including dispensing device and receiving device, wherein, described dispensing device includes: multiple luminaires；Serial-parallel converter, for transmission data are carried out serioparallel exchange, thus produces N number of data stream；Manipulator, for utilizing the dimension of predetermined number to be modulated the N number of data stream for each carrier wave produced, thus produces N number of modulated signal；Carrier signal multiplier, for the N number of modulated signal produced is multiplied by orthogonal N number of carrier signal respectively, thus produces N number of transmission signal；And luminous controling unit, for making multiple luminaire luminous according to the N number of transmission signal produced.
Description
Technical field
The present invention relates to a kind of visible ray (visible ray) communication system, dispensing device and signalling
Method.
Background technology
The optical communication technique of a kind of light used in visible-range is the most of great interest.Especially,
Along with the luminaire using the such as light-emitting component of LED (light emitting diode) etc the most promptly obtains
To being widely used, have been carried out for the basis by utilizing such as inner/outer luminaire etc
Facility realizes the exploitation with the technology of the data communication of the more speed of high convenience.
As the luminous component communicated for high speed optical data, it is contemplated that to human body or the shadow of medical apparatus and instruments
Ringing, LED is the most strong candidate.Meanwhile, there is the semiconductor light emitting of the response performance of more speed
Equipment, such as laser diode (LD) or super-radiance light emitting diode (SLD) are proposed as candidate.
Data transmission speed in optical communications depends on the response speed of luminaire.Due to this reason, this
The luminaire of the response performance with more speed receives publicity.
Additionally, in order to further improve data transmission speed, need for sending from luminaire
A signal during stably send permitted multidata technology.Such as, as such optical communication technique,
Japanese Patent Laid-Open is announced HEI 2008-252444 and is disclosed a kind of by distributing on direction in space
The time shaft of OFDM (OFDM) signal removes the technology of spatial interference.
Summary of the invention
Technical problem
When using OFDM, it is possible to improve frequency usage efficiency and the durability to anti-multipath
(endurance).Therefore, at wireless communication system (such as, WLAN) or wired communication system
OFDM is widely used in (such as, ADSL).In visible light communication, it is desirable to by OFDM's
Application improves communication quality.But, in OFDM, there is PAPR (Peak to Average Power
Ratio, peak-to-average power ratio) problem that increases.In other words, in transmitters and receivers
Need big dynamic range.
Therefore, when OFDM is applied to visible light communication, the biggest electric current is leading to as visible ray
The LED sending parts of letter flows.Such as, in the led, the current range of flowing is from hundreds of millis
Peace (mA) is to number peace (A).For this reason, it may be necessary to provide to cover in sending side, there is the dynamic of non-constant width
The drive circuit of the signal of scope.But, generally, LED is for sending the light of scheduled volume, therefore actual
On be unsuitable for processing the signal of this wide dynamic range, because it needs special element.
Therefore, making the present invention to solve the problems referred to above occurred in prior art, the present invention provides a kind of
Visible light communication system, dispensing device and signaling method, described system, the novelty of apparatus and method
With the improvement is that: luminous component is not forced to the performance requirement of HDR, it is possible to achieve class
It is similar to the improvement of the communication quality realized by OFDM, and can utilize at the multiplexing of predetermined quantity
Reason sends more data.
Technical scheme
According to an aspect of the present invention, it is provided that a kind of visible light communication including dispensing device and receiving device
System, wherein, described dispensing device includes: multiple luminaires；String also (S/P) transducer, for right
Send data and carry out serioparallel exchange, thus produce N number of data stream；Manipulator, for predetermined number
Dimension is modulated by N number of data stream that S/P transducer is the generation of each carrier wave, thus produces N
Individual modulated signal；Carrier signal multiplier, for taking advantage of the N number of modulated signal produced by manipulator respectively
With N number of carrier signal, described N number of carrier signal is orthogonal to described N number of modulated signal, thus produces
N number of transmission signal；And luminous controling unit, for N number of according to produced by carrier signal multiplier
Sending signal makes the plurality of luminaire luminous, and described reception device includes: optical receiving device,
For receiving light, thus receive signal according to the output of corresponding receiving intensity, described just from described transmission
That multiple luminaires of device send and in transmission line by spatial reuse；FFT unit, is used for
By using N number of carrier signal to perform FFT for the reception signal exported from optical receiving device, thus carry
Take N number of modulated signal of each carrier wave；And demodulator, for every for extract from FFT unit
Individual modulated signal is demodulated.
Application by configuration described above, it is possible to the communicativeness realizing with being realized by OFDM
The improvement improving similar communication performance of energy.For example, it is possible to by using traditional infrastructure to carry
Altofrequency service efficiency and durability.
Additionally, when quantity N of luminaire is more than quantity n (N ＞ n) of carrier signal, described luminescence
Multiple equipment luminescence simultaneously that control unit can make in luminaire based on sent in signal.With
Time, when quantity N of luminaire is less than quantity n (N ＜ n) of carrier signal, described light emitting control list
M (2≤M ＜ n) the individual signal that unit can send in signal is added, and based on being obtained by this addition
Sending signal makes luminaire luminous.
Additionally, described reception device can include the imageing sensor as optical receiving device, it is used for detecting
From the intensity of each light that the plurality of luminaire sends, and export corresponding to each luminaire
Receive signal.Configured by this, because the intensity of the light produced from each luminaire can be detected,
It is possible to reduce the dynamic range performance requirement putting on optical pickup apparatus.
Additionally, described dispensing device can include the multiple luminaires sending different colours light.This
In the case of, described reception device includes for receiving different colours light and exporting based on corresponding receiving intensity
Receive multiple optical receiving devices of signal.Configured by this, because can detecting and setting from each luminescence
The intensity of the standby light produced, it is possible to the dynamic range performance that reduction puts on light-receiving member is wanted
Ask.Additionally, when applying this configuration, because the signal of each carrier frequency has orthogonality, so can
To remove the impact disturbed by the color caused by the spectral frequency of luminaire and optical receiving device.
According to a further aspect in the invention, it is provided that a kind of dispensing device, including multiple luminaires；S/P
Transducer, for transmission data are carried out serioparallel exchange, thus produces N number of data stream；Manipulator, uses
Adjust by N number of data stream that S/P transducer is the generation of each carrier wave in the dimension with predetermined number
System, thus produce N number of modulated signal；Carrier signal multiplier, for the N that will be produced by manipulator
Individual modulated signal is multiplied by N number of carrier signal respectively, and described N number of carrier signal is orthogonal to described N number of tune
Signal processed, thus produce N number of transmission signal；And luminous controling unit.For according to by carrier signal
N number of transmission signal that multiplier produces makes the plurality of luminaire luminous.
Application by configuration described above, it is possible to the communicativeness realizing with being realized by OFDM
The improvement improving similar communication performance of energy.For example, it is possible to improve frequency usage efficiency and resist many
The durability in footpath.Additionally, by the transmission signal produced that is multiplied of each carrier signal not at dispensing device
Interior multiplexing, but directly sent by each luminaire.Therefore, it is re-used then with N number of transmission signal
Situation about being sent is compared, it is possible to by the dynamic range control needed for luminaire and luminous controling unit
To the lowest.As a result, for luminaire or luminous controling unit, it is possible to use relatively cheap LED (or
LED drive circuit), and the manufacturing cost for dispensing device can be reduced.It is commonly used for common
The LED (or LED drive circuit) of luminaire be little to meet the performance of HDR and want
Ask.But, in the configuration of dispensing device described above, because the performance for dynamic range is wanted
Ask control to the lowest, it is possible to use traditional infrastructure.
According to a further aspect in the invention, it is provided that a kind of signaling method comprised the following steps: by wrapping
Include the dispensing device of multiple luminaire and go here and there also (S/P) conversion to sending data, thus produce N number of number
According to stream；By described dispensing device with N number of data for each carrier wave to producing of the dimension of predetermined number
Stream is modulated, thus produces N number of modulated signal；The N number of modulation that will be produced by described dispensing device
Signal is multiplied by N number of carrier signal respectively, and described N number of carrier signal is orthogonal to described N number of modulated signal,
Thus produce N number of transmission signal；And made according to the N number of transmission signal produced by described dispensing device
The plurality of luminaire is luminous；By receiving device by using N number of carrier signal for from receiving device
The output of the described optical receiving device included receives signal and performs FFT, thus extracts the N of each carrier wave
Individual modulated signal, described optical receiving device sends for receiving the multiple luminaires from described dispensing device
Light and receive signal according to the output of corresponding receiving intensity, described light is multiple by space in transmission line
With；And demodulate the modulated signal of each extraction.
By the application of process as described above, it is possible to the communicativeness realizing with being realized by OFDM
The improvement improving similar communication performance of energy.For example, it is possible to improve frequency usage efficiency and resist many
The durability in footpath.Additionally, by the transmission signal produced that is multiplied of each carrier signal not at transmission equipment
Interior multiplexing, but directly sent by each luminaire.Therefore, it is re-used then with N number of transmission signal
Situation about being sent is compared, it is possible to by the dynamic range control needed for luminaire and luminous controling unit
To the lowest.As a result, for luminaire or luminous controling unit, it is possible to use relatively cheap LED (or
LED drive circuit), and the manufacturing cost of dispensing device can be reduced.It is commonly used for common photograph
The LED (or LED drive circuit) of bright equipment is little to meet the performance requirement of HDR.
But, in the configuration of visible light communication system described above, because by the performance for dynamic range
Require to control to the lowest, it is possible to configure by using traditional infrastructure to realize this system.
According to a further aspect in the invention, it is provided that the signal of a kind of dispensing device including multiple luminaire
Sending method, said method comprising the steps of: carries out serioparallel exchange to sending data, thus produces N
Individual data stream；With the dimension of predetermined number, the N number of data stream for each carrier wave produced is adjusted
System, thus produce N number of modulated signal；The N number of modulated signal produced is multiplied by respectively N number of carrier wave letter
Number, described N number of carrier signal is orthogonal to described N number of modulated signal, thus produces N number of transmission signal；
And make the plurality of luminaire luminous according to the N number of transmission signal produced.
By the application of process as described above, it is possible to the communicativeness realizing with being realized by OFDM
The improvement improving similar communication performance of energy.For example, it is possible to improve frequency usage efficiency and resist many
The durability in footpath.Additionally, by the transmission signal produced that is multiplied of each carrier signal not at transmission equipment
Interior multiplexing, but directly sent by each luminaire.Therefore, it is re-used then with N number of transmission signal
Situation about being sent is compared, it is possible to by the dynamic range control needed for luminaire and luminous controling unit
To the lowest.As a result, for luminaire or luminous controling unit, it is possible to use relatively cheap LED (or
LED drive circuit), and the manufacturing cost of dispensing device can be reduced.It is commonly used for common photograph
The LED (or LED drive circuit) of bright equipment is little to meet the performance requirement of HDR.
But, in the configuration of dispensing device described above, because by the performance requirement control for dynamic range
System is to the lowest, it is possible to use traditional infrastructure.
Beneficial effect
In superincumbent description, LED is used as luminous component.But, in addition to LED, such as half
Conductor luminaire (such as, LD and SLD), fluorescent lamp, Braun tube (CRT) display device, etc.
Ion display device (PDP), organic field luminescence (EL) display device, liquid crystal display (LCD)
The various equipment of equipment etc can be used as luminous component.
As it has been described above, in accordance with the present invention, it is possible to realize the communication matter being similar to be realized by OFDM
The improvement of amount, and the performance requirement of HDR need not be forced at luminous component.As a result, it is possible to
Realize easily and cheap and be there is the transmission of high communication performance being similar to be realized by OFDM fill
Put and visible light communication system.
Accompanying drawing explanation
Fig. 1 is the explanatory of the example of the configuration of the visible light communication system being shown with OFDM；
Fig. 2 is the saying of example illustrating the configuration of visible light communication system according to an embodiment of the invention
Bright property view；
Fig. 3 is the example of the configuration of the visible light communication system of the embodiment illustrating the amendment according to Fig. 2
Explanatory；
Fig. 4 is the example of the configuration of the visible light communication system of the embodiment illustrating the amendment according to Fig. 2
Explanatory；
Fig. 5 is the example of the configuration of the visible light communication system of the embodiment illustrating the amendment according to Fig. 2
Explanatory；And
Fig. 6 is the example of the configuration of the visible light communication system of the embodiment illustrating the amendment according to Fig. 2
Explanatory.
Detailed description of the invention
Hereinafter, will be described in detail with reference to the accompanying drawings the one exemplary embodiment of the present invention.Here, in this description
With in accompanying drawing, will be omitted having essentially identical functional configuration by the identical reference number of distribution
Constitute the repeated description of part.
[order of detailed description]
Hereinafter, the order to the explanation of the embodiment of the present invention that will describe after a while is as follows.First, will ginseng
Examine Fig. 1 and describe the configuration of the visible light communication system LS1 using OFDM.Especially, will describe by
In applying some problems caused by OFDM in visible light communication system.Subsequently, will be with reference to Fig. 2
The configuration of description visible light communication system LS2 according to embodiments of the present invention.Subsequently, will with reference to Fig. 3 and
Fig. 4 describes visible light communication system LS3 and LS4 of the amendment embodiment according to this embodiment.
[general introduction of problem to be solved]
Hereinafter, before being given about the detailed description of the technology of one embodiment of the invention, will be summarized logical
Cross some problems that this embodiment will solve.
(configuration of visible light communication system LS1)
First, the configuration of visible light communication system LS1 will be described in detail with reference to Fig. 1, and summarize by this
The problem caused by application of configuration.Fig. 1 is the visible light communication system LS1 being shown with OFDM
The explanatory of example of configuration.
As it is shown in figure 1, visible light communication system LS1 includes dispensing device 10 and receives device 30.Send out
Device 10 is sent to have S/P transducer 12, manipulator 14, IFFT unit, drive circuit 22 and send out
Light device 24.Herein, IFFT unit includes multiplier 16 and adder 20.Receive device 30 to have
Optical receiving device 32, FFT unit, demodulator 38 and P/S transducer 40.Herein, FFT unit bag
Include multiplier 34 and integrating circuit 36.FFT is the abbreviation of fast Fourier transform, and IFFT is inverse FFT
Abbreviation.
Serioparallel exchange is carried out to sending data d by S/P transducer 12.Subsequently, from S/P transducer 12
Output is equal to the data stream of number of carrier wave.Meanwhile, in the following description, the quantity of carrier wave is n.By
Manipulator 14 corresponds to from S/P transducer 12 output with the dimension of predetermined number (such as, 2)
The data stream of each carrier wave is modulated.Subsequently, modulated signal is exported from manipulator 14.From manipulator
The modulated signal of each carrier wave of 14 outputs is imported into IFFT unit.Therefore, equal to number of carrier wave
Modulated signal is imported into IFFT.IFFT unit is for believing the modulation equal to number of carrier wave of input
Number perform IFFT parts.First, in multiplier 16, will enter into the modulated signal of IFFT unit
It is multiplied by sinusoidal (sinusoidal wave) signal of carrier wave.Herein, corresponding to carrier frequency f1～fn n carrier wave just
String signal cos (2 π f1t)～cos (2 π fnt) is orthogonal.It is multiplied by each modulation letter of carrier wave sinusoidal signal
Number (hereinafter referred to as carrier signal) is input to adder 20.In adder 20, each carrier wave
Signal is added to produce ofdm signal each other.
The ofdm signal produced by adder 20 is input to drive circuit 22.Drive circuit
22 is the drive circuit for driven for emitting lights equipment 24 (LED (W)).When ofdm signal is transfused to,
Drive circuit 22 ofdm signal based on input controls to be supplied to the magnitude of current of luminaire 24,
And the light of luminaire 24 is sent with the emissive porwer of the signal amplitude according to ofdm signal.From
The light that luminaire 24 produces is received by the optical receiving device 32 receiving device 30.Optical receiving device 32
It it is photo-electric conversion element.Due to this reason, when light is received by optical receiving device 32, output is according to connecing
The signal of telecommunication (hereinafter referred to as receiving signal) of the intensity of the light received.From connecing of optical receiving device 32 output
The collection of letters number is imported into FFT unit.FFT unit is every to extract for docking the collection of letters number execution FFT
The parts of individual carrier frequency component.
Be imported into multiplier 34 from the reception signal of optical receiving device 32 output, and be multiplied by corresponding to
The carrier wave sinusoidal signal of each in carrier frequency f1～fn.Multiplier 34 is multiplied by each
The reception signal of carrier wave sinusoidal signal is input to integrating circuit 36.In integrating circuit 36, in the time
The signal exported from multiplier 34 is amassed up to the integration interval of OFDM symbol length (T) on axle
Partite transport is calculated, and extracts and each the corresponding component of signal in carrier frequency f1～fn.From integration
Each carrier frequency component that circuit 36 extracts is imported into demodulator 38.Each carrier frequency component pair
Should be in each carrier signal.Due to this reason, when the demodulated device of each carrier frequency component 38 demodulates,
Data stream corresponding to each carrier signal is resumed.The each data stream quilt recovered in demodulator 38
Input to P/S transducer 40 to recover to send data d.
By this configuration, it is possible to improve frequency usage efficiency and the durability to anti-multipath, and
Significantly increase communication quality.But, because each in the front end of the drive circuit 22 of dispensing device
Individual carrier frequency component is added each other and causes PAPR specific to OFDM to increase, and luminaire
24 are based upon what the described ofdm signal being added acquisition drove.Therefore, for high dynamic range
The performance requirement enclosed is applied in drive circuit 22 and luminaire 24.Due to this reason, actually
It is difficult in conventional lighting devices use OFDM visible light communication.Furthermore, it is possible to meet this performance
The drive circuit 22 or the luminaire 24 that require are much more expensive.This is related to the manufacturing cost of transmitter
Increase.As it has been described above, the difficulty when the infrastructure that use is traditional makes installation cost increase.Slightly
After in the embodiment that will describe, the configuration of transmitter made in view of these problems will be proposed.Described
Transmitter can be removed the impact by the high PAPR caused by OFDM and reduce for drive circuit
22 and the performance requirement of dynamic range of luminaire 24.
<embodiment>
Hereinafter, one embodiment of the present of invention will be described.In the present embodiment, IFFT is not in sending side
Perform, and driven for emitting lights equipment direct for each carrier wave.This is to put on driver electricity to reduce
Road and the performance requirement of luminaire.
[configuration of visible light communication system LS2]
First, the configuration of visible light communication system LS2 related to the present embodiment will be described with reference to Fig. 2.
Fig. 2 is that the illustrative of example of the configuration illustrating the visible light communication system LS2 according to the present embodiment regards
Figure.
As in figure 2 it is shown, visible light communication system LS2 includes dispensing device 100 and receives device 200.
Dispensing device 100 has S/P transducer 102, manipulator 104, multiplier 106, drive circuit
110 and multiple luminaire 112.Meanwhile, receiving device 200, to have optical receiving device 202, FFT mono-
Unit, demodulator 208 and P/S transducer 210.Herein, FFT unit 204 includes multiplier 204 He
Integrating circuit 206.
Serioparallel exchange is carried out to sending data d by S/P transducer 102.Subsequently, from S/P transducer 102
Output is equal to the data stream of number of carrier wave.Meanwhile, in the following description, number of carrier wave is n.By adjusting
Device 104 processed utilizes the dimension of predetermined number (such as, the 2) correspondence to exporting from S/P transducer 102
Data stream in each carrier wave is modulated.Subsequently, modulated signal is exported from manipulator 104.From modulation
The modulated signal of each carrier wave of device 104 output is imported into multiplier 106.In multiplier 106,
Modulated signal is multiplied by the carrier wave sinusoidal signal corresponding to each in carrier frequency f1～fn
Cos (2 π f1t)～cos (2 π fnt).Herein, corresponding to carrier frequency f1～fn n carrier wave sinusoidal signal that
This is orthogonal.
In multiplier 106, it is multiplied by each modulated signal of carrier wave sinusoidal signal (hereinafter referred to as load
Ripple signal) it is input to drive circuit 110.For each luminaire
112 (LED (W1)～LED (Wn)) provides drive circuit 110, and drive circuit 110 is used for driving often
Individual luminaire 112 (LED (W1)～LED (Wn)).When carrier signal is transfused to, drive circuit 110
Carrier signal based on input controls to be supplied to the magnitude of current of luminaire 112, and to believe according to carrier wave
Number the emissive porwer of signal amplitude send the light of each luminaire 112.From each luminaire 112
The light produced in transmission line by spatial reuse, and by receiving the optical receiving device 202 of device 200
Receive.Optical receiving device 202 a, it may for example comprise PD (photodiode).When light is received,
From optical receiving device 202 export according to receive light intensity the signal of telecommunication (hereinafter referred to as receive signal).
It is imported into FFT unit from the reception signal of optical receiving device 202 output.FFT unit is for docking
Collect mail number execution FFT to extract the parts of each carrier frequency component.
It is imported into multiplier 204 from the reception signal of optical receiving device 202 output, and is multiplied by correspondence
Carrier wave sinusoidal signal cos (2 π f1t) of each in carrier frequency f1～fn～cos (2 π fnt).At multiplication
The reception signal being multiplied by each carrier wave sinusoidal signal in device 204 is input to integrating circuit 206.
In integrating circuit 206, on a timeline with up to OFDM symbol length (T) integration interval to from
The signal of multiplier 204 output is integrated computing, and extracts corresponding in carrier frequency f1～fn
The component of signal of each.The each carrier frequency component extracted from integrating circuit 206 is imported into demodulation
Device 208.Each carrier frequency component corresponds to each carrier signal.Due to this reason, when by demodulator
208 when demodulate each carrier frequency component, and the data stream corresponding to each carrier signal is resumed.?
The each data stream recovered in demodulator 208 is input to P/S transducer 210 to recover to send data d.
In the configuration of the visible light communication system LS2 according to the present embodiment being described above, corresponding to each
Each carrier signal of individual carrier frequency is not added each other in the front end of drive circuit 110, and each
The light of luminaire 112 sends with the emissive porwer of the signal amplitude according to each carrier signal.As above
Described, because each carrier signal is not added each other in the front end of drive circuit 110, it is not resulted in
High PAPR (problem in OFDM), and the drive circuit of each carrier frequency can be would correspond to
110 and luminaire 112 needed for dynamic range control to the lowest.As a result, by use miniaturization and
The most expensive LED drive circuit (or LED), it is possible to achieve similar in appearance to the communication realized by OFDM
The improvement of performance.For example, it is possible to realization can improve frequency by effectively utilizing traditional infrastructure
Service efficiency and the visible light communication system of the durability to anti-multipath.
[configuration of visible light communication system LS3]
Hereinafter, the configuration of visible light communication system LS3 will be described with reference to Fig. 3, i.e. according to the present embodiment
The embodiment of one of visible light communication system LS2 amendment.Fig. 3 is to illustrate according to the present embodiment
The view of the example of the configuration of the visible light communication system LS3 of the embodiment of individual amendment.
As it is shown on figure 3, visible light communication system LS3 includes dispensing device 100 and receives device 200.
Dispensing device 100 has S/P transducer 102, manipulator 104, multiplier 106, drive circuit
110 and luminaire 112.In other words, the configuration of dispensing device 100 and visible light communication system LS2
The configuration of dispensing device 100 identical.Meanwhile, receive device 200 and there is imageing sensor 202, DFT
Unit, demodulator 208 and P/S transducer 210.Herein, DFT unit includes multiplier 204 and amasss
Parallel circuit 206.DFT is the abbreviation of discrete Fourier transform.Above, it will be seen that optical communication system LS3
The light-receiving member receiving device 200 is essentially consisted in the difference of visible light communication system LS2.Cause
This, be described below the difference about light-receiving member.
Imageing sensor 232 is the light for producing from multiple luminaires 112 of dispensing device 100
It is converted into the parts receiving signal.Herein, imageing sensor 232 can be specified according to light-receiving position
Each luminaire 112.Such as, imageing sensor 232 can will connect in the pixel of position (X1, Y1)
The light received is appointed as the light that the luminaire 112 (LED (W1)) from dispensing device 100 sends.With so
Mode, the light of each pixel being input to imageing sensor 232 is confirmed as from each luminaire
112 light sent.Due to this reason, imageing sensor 232 will be according to from each luminaire 112
The reception signal of the receiving intensity of the light gone out is input to DFT unit.Herein, DFT rather than FFT is used
The reason of the modulated signal extracting each carrier frequency is: in the output of imageing sensor 232, letter
Number separated according to carrier frequency.For the output of imageing sensor 232, perform DFT, and
According to this result, in demodulator 208, perform demodulation.Additionally, perform string in P/S transducer 210
And change to recover to send data d.
The visible light communication system LS3 of the embodiment of an amendment according to the present embodiment described above
Configuration in, it is possible to the dynamic range control of light-receiving member of device 200 will be received to the lowest.
[configuration of visible light communication system LS4]
Hereinafter, the configuration of visible light communication system LS4 will be described with reference to Fig. 4, i.e. according to the present embodiment
The embodiment of one of visible light communication system LS2 amendment.Fig. 4 is to illustrate according to the present embodiment
The explanatory of the example of the configuration of the visible light communication system LS4 of the embodiment of individual amendment.
As shown in Figure 4, it is seen that optical communication system LS4 includes dispensing device 100 and receives device 200.
Dispensing device 100 has S/P transducer 102, manipulator 104, multiplier 106, drive circuit
110 and luminaire 152.Herein, in the dispensing device 100 of the embodiment of this amendment, provide many
Individual luminaire 152 (light frequency of C1～Cn) in different colors is luminous.Meanwhile, device 200 is received
There is optical receiving device 252, DFT unit, demodulator 208 and P/S transducer 210.Herein, DFT
Unit includes multiplier 204 and integrating circuit 206.Above, it will be seen that optical communication system LS4 with can
See the luminous component differring primarily in that dispensing device 100 of optical communication system LS2 and receive device 200
Light-receiving member.Therefore, it is described below about the difference at described parts.
Be similar to visible light communication system LS2, each luminaire 152 (LED (C1)～LED (Cn)) with
Send out according to corresponding to the emissive porwer of the signal amplitude of the carrier signal of each in carrier frequency f1～fn
Light.Herein, each luminaire 152 sends the light with different colours (C1～Cn).It can be said that this
The embodiment of amendment is by by the visible light communication system LS2 of the present embodiment and so-called WDM (ripple
Point multiplexing) technology is combined to make, and wherein, signal is assigned to each color C1～Cn with multiple
Use transmission line.From the light of each luminaire 152 generation of the color having C1～Cn by receiving
Each optical receiving device 252 of the color having in C1～Cn in device 200 receives.At light-receiving
In equipment 252, it is possible to use there is the PD (so-called color sensor) of the filter of respective color.
For the signal exported from the optical receiving device 252 of each color, DFT unit performs DFT,
In demodulator 208, perform demodulation, and in P/S transducer 210, perform serioparallel exchange to recover to send out
Send data d.
The visible light communication system LS4 of the embodiment of an amendment according to the present embodiment described above
Configuration in, it is possible to the dynamic range control of light-receiving member of device 200 will be received to the lowest.With
Time, in the case of WDM, caused by the spectral frequency of luminaire 152 and optical receiving device 252
Color interference (color interference) be problem.On the other hand, in this embodiment revised,
Because the signal causing each color due to the orthogonality of OFDM carrier wave can be separated from one another, so
Improve the interference of this color.Therefore, according to the embodiment of this amendment, it is possible to by luminous component and light
Dynamic range control needed for reception parts, to the lowest, has the outstanding communication characteristic of OFDM simultaneously,
And do not consider the impact that color is disturbed.As a result, it is possible to by being efficiently used traditional infrastructure
Construct the small-sized and cheap visible light communication system with high communication performance.
[configuration of visible light communication system LS5]
Hereinafter, the configuration of visible light communication system LS5 will be described with reference to Fig. 5, i.e. according to the present embodiment
The embodiment of one of visible light communication system LS2 amendment.Fig. 5 is to illustrate according to the present embodiment
The explanatory of the example of the configuration of the visible light communication system LS5 of the embodiment of individual amendment.
As it is shown in figure 5, visible light communication system LS5 includes dispensing device 100 and receives device 200.
Dispensing device 100 has S/P transducer 102, manipulator 104, multiplier 106, drive circuit
110 and luminaire 112.Visible light communication system LS5 is at drive circuit 110 and luminaire 112
Quantitative aspects be different from visible light communication system LS2.Especially, joining in this embodiment revised
In putting, quantity N of drive circuit 110 and luminaire 112 is higher than quantity n of carrier signal (n ＜ N).
Meanwhile, receive the configuration of device 200 actually with visible light communication system LS2 receive device 200
Configure identical.Above, it will be seen that optical communication system LS5 is mainly at the luminous component of dispensing device 100
Aspect is different from visible light communication system LS2.
Serioparallel exchange is carried out to sending data d by S/P transducer 102.Subsequently, from S/P transducer 102
Output is equal to the data stream of number of carrier wave.Herein, the quantity of carrier wave is n.Utilized pre-by manipulator 104
The dimension of fixed number mesh (such as, the 2) number corresponding to each carrier wave to exporting from S/P transducer 102
It is modulated according to stream.Subsequently, modulated signal is exported from manipulator 104.From manipulator 104 output every
The modulated signal of individual carrier wave is imported into multiplier 106.In multiplier 106, modulated signal is multiplied by right
Should be in carrier wave sinusoidal signal cos (2 π f1t) of each in carrier frequency f1～fn～cos (2 π fnt).Herein,
N the carrier wave sinusoidal signal corresponding to carrier frequency f1～fn is orthogonal.
Up to the present the step described is identical with those steps of visible light communication system LS2.But,
It is imported into multiple drive circuit 110 from the carrier signal of multiplier 106 output.Such as, at multiplication
Device 106 has been multiplied by the carrier signal of carrier wave sinusoidal signal cos (2 π f1t) be branched (branch) and
It is input to two drive circuits 110 (D1, D2).For each luminaire
112 (LED (W1)～LED (WN)) provides drive circuit 110, and drive circuit 110 is used for driving often
Individual luminaire 112 (LED (W1)～LED (WN)).When carrier signal is transfused to, drive circuit
110 carrier signals based on input control to be supplied to the magnitude of current of luminaire 112, and with according to load
The emissive porwer of the signal amplitude of ripple signal sends the light of each luminaire 112.This feature with can
See that optical communication system LS2 is identical.But, it is seen that optical communication system LS5 and visible light communication system LS2
Difference be: control the luminescences of multiple luminaires 112 based on identical carrier signal.Pass through
This configuration, can be preferably applied to quantity N of luminaire 112 according to the technology of this embodiment
Situation higher than quantity n (n ＜ N) of carrier signal.
The visible light communication system LS5 of the embodiment of according to the present embodiment the amendment being described above
Configuration in, corresponding to each carrier signal of each carrier frequency not in the front end of drive circuit 110
It is added each other, and the light of each luminaire 112 sending out with the signal amplitude according to each carrier signal
Penetrate intensity to send.Quantity N of this characteristic and luminaire 112 is higher than the quantity of carrier signal
The situation of n (n ＜ N) is identical.Accordingly, because each carrier signal not in the front end of drive circuit 110 that
This is added, so being not resulted in high PAPR (problem in OFDM), and can would correspond to each load
Dynamic range control needed for wave frequency, drive circuit 110 and luminaire 112 is to the lowest.Knot
Really, by using miniaturization and cheap LED drive circuit (or LED), it is possible to achieve with by OFDM
The improvement improving similar communication performance of the communication performance realized.
[configuration of visible light communication system LS6]
Hereinafter, the configuration of visible light communication system LS6 will be described with reference to Fig. 6, i.e. according to the present embodiment
The embodiment of one of visible light communication system LS2 amendment.Fig. 6 is to illustrate according to the present embodiment
The explanatory of the example of the configuration of the visible light communication system LS6 of the embodiment of individual amendment.
As shown in Figure 6, it is seen that optical communication system LS6 includes dispensing device 100 and receives device 200.
Dispensing device 100 has S/P transducer 102, manipulator 104, multiplier 106, drive circuit
110 and luminaire 112.Visible light communication system LS6 is at drive circuit 110 and luminaire 112
Quantitative aspects be different from visible light communication system LS2.Especially, joining in this embodiment revised
In putting, quantity N of drive circuit 110 and luminaire 112 is lower than quantity n of carrier signal (n ＞ N).
Additionally, be different from visible light communication system LS2, it is seen that optical communication system LS6 is included in multiplier 106
Rear end provide adder.Simultaneously, it is seen that optical communication system LS6 is of virtually and visible light communication
The reception device 200 that the reception device 200 of system LS2 similarly configures.Above, it will be seen that optic communication
System LS6 is mainly different from visible light communication system LS2 in terms of the luminous component of dispensing device 100.
Serioparallel exchange is carried out to sending data d by S/P transducer 102.Subsequently, from S/P transducer 102
Output is equal to the data stream of number of carrier wave.Herein, the quantity of carrier wave is n.Utilized pre-by manipulator 104
The dimension of fixed number mesh (such as, the 2) number corresponding to each carrier wave to exporting from S/P transducer 102
It is modulated according to stream.Subsequently, modulated signal is exported from manipulator 104.From manipulator 104 output every
The modulated signal of individual carrier wave is imported in multiplier 106.In multiplier 106, modulated signal is multiplied by
Carrier wave sinusoidal signal cos (2 π f1t)～cos (2 π fnt) corresponding to each in carrier frequency f1～fn.This
Place, n the carrier wave sinusoidal signal corresponding to carrier frequency f1～fn is orthogonal.
Up to the present the step described is identical with those steps of visible light communication system LS2.But,
It is made to be added each other, so by the carrier signal exported from multiple multipliers 106 is input to adder
After be entered into drive circuit 110.Such as, by carrier wave will be multiplied by multiplier 106
The carrier signal of sinusoidal signal cos (2 π f1t) and be multiplied by carrier wave sinusoidal signal in multiplier 106
The carrier signal of cos (2 π f2t) is input to adder to make it be added each other, and is entered into driver
Circuit 110 (D1).Drive circuit is provided for each luminaire 112 (LED (W1)～LED (WN))
110, and drive circuit 110 is used for driving each luminaire 112 (LED (W1)～LED (WN)).
When carrier signal is transfused to, drive circuit 110 carrier signal based on input controls to be supplied to luminescence
The magnitude of current of equipment 112, and send each with the emissive porwer of the signal amplitude according to carrier signal
The light of luminaire 112.This feature is identical with visible light communication system LS2.But, being different from can
See optical communication system LS2, in visible light communication system LS6, control based on the carrier signal 112 being added
Make the luminescence of each luminaire 112.Being configured by this, the technology according to this embodiment can be excellent
Selection of land is applied to following situation: quantity N of luminaire 112 is less than quantity n (n ＞ N) of carrier signal.
It is described above the visible light communication system LS6 of the embodiment that according to the present embodiment revises
Configuration in, corresponding to each carrier signal of each carrier frequency not in the front end of drive circuit 110
It is added each other, and, after the addition of some carrier signals, with the signal according to each carrier signal
The emissive porwer of amplitude sends the light of each luminaire 112.Accordingly, because each carrier signal is not
It is added each other in the front end of drive circuit 110, so being not resulted in high PAPR (problem in OFDM),
And the dynamic range control needed for each drive circuit 110 and each luminaire 112 can be arrived
The lowest.As a result, by using miniaturization and cheap LED drive circuit (or LED), it is possible to achieve
The improvement improving similar communication performance to the communication performance realized by OFDM.
Although with reference to the accompanying drawings of the preferred embodiments of the present invention, it is to be appreciated that the present invention is not
It is limited to the disclosed embodiments.Therefore, it would be recognized by those skilled in the art that can be in appended right
Make various changes and modifications in the range of requirement.This change and amendment are clear to those skilled in the art
Chu, without departing from the spirit and scope of the present invention.
Industrial applicability
Although the particular exemplary embodiment with reference to the present invention illustrates and describe the present invention, but ability
Field technique personnel are it should be understood that various change can be carried out in terms of form and details without deviating from by appended power
Profit requires the spirit and scope of the present invention limited.
Claims (7)
1. include dispensing device and receive a visible light communication system for device,
Wherein, described dispensing device includes:
The multiple luminaires that can be modulated independently of each other；
String also (S/P) transducer, for transmission data are carried out serioparallel exchange, thus produces N
Individual data stream；
Manipulator, for the dimension of predetermined number to being that each carrier wave produces by S/P transducer
N number of data stream be modulated, produce N number of modulated signal；
Carrier signal multiplier, for being multiplied by the N number of modulated signal produced by manipulator respectively
N number of quadrature carrier signals, produces N number of transmission signal；And
Luminous controling unit, for according to the N number of transmission signal produced by carrier signal multiplier
Make the plurality of luminaire luminous, and for determining the number n of described luminaire and described
The number N of carrier signal, and
Described reception device includes:
Optical receiving device, for receive that send from multiple luminaires of described dispensing device and
By the light of spatial reuse in transmission line, receive signal according to the output of corresponding receiving intensity；
FFT unit, for by using the reception to exporting of N number of carrier signal from optical receiving device
Signal performs FFT, extracts N number of modulated signal of each carrier wave；And
Demodulator, for each from the modulated signal that FFT unit is extracted is demodulated,
Wherein, determine that the number n of described luminaire believes more than described carrier wave when described luminous controling unit
Number number N (N ＜ n) time, described luminous controling unit based on N number of carrier signal one of them stand
Carve and make the multiple equipment in described luminaire luminous.
2. visible light communication system as claimed in claim 1, wherein, when luminous controling unit determines
When quantity n of luminaire is less than quantity N (N ＞ n) of carrier signal, described luminous controling unit will be sent out
M (2≤M ＜ N) individual signal in the number of delivering letters is added, and based on by the described transmission letter being added and obtaining
Number make luminaire luminous.
3. the visible light communication system as described in any one in claim 1 to 2, wherein, institute
State reception device and include the imageing sensor as optical receiving device, set from the plurality of luminescence for detection
The intensity of each in the light that preparation goes out, and export the reception corresponding to each in luminaire
Signal.
4. the visible light communication system as described in any one in claim 1 to 2, wherein, institute
State dispensing device and include sending multiple luminaires of different colours light, and described reception device includes using
In receiving different colours light and receiving multiple optical receiving devices of signal based on the output of corresponding receiving intensity.
5. a dispensing device includes:
The multiple luminaires that can be modulated independently of each other；
S/P transducer, for transmission data are carried out serioparallel exchange, thus produces N number of data stream；
Manipulator, for the dimension of predetermined number to by S/P transducer be each carrier wave produce N number of
Data stream is modulated, and produces N number of modulated signal；
Carrier signal multiplier, for being multiplied by N number of respectively by the N number of modulated signal produced by manipulator
Quadrature carrier signals, produces N number of transmission signal；And
Luminous controling unit, described for making according to the N number of transmission signal produced by carrier signal multiplier
Multiple luminaires are luminous and are used for determining number n and the number of described carrier signal of described luminaire
Mesh N,
Wherein, determine that the number n of described luminaire believes more than described carrier wave when described luminous controling unit
Number number N (N ＜ n) time, described luminous controling unit based on N number of carrier signal one of them stand
Carve and make the multiple equipment in described luminaire luminous.
6. a signaling method, it comprises the following steps:
By including that the dispensing device of the multiple luminaires that can be modulated independently of each other is to sending data
Carry out serioparallel exchange；
By described dispensing device with N number of data for each carrier wave to producing of the dimension of predetermined number
Stream is modulated, and produces N number of modulated signal；
By described dispensing device, the N number of modulated signal produced is multiplied by N number of quadrature carrier signals respectively,
Thus produce N number of transmission signal；
Made the plurality of luminaire luminous by described dispensing device according to the N number of transmission signal produced；
Determined the number n of described luminaire by described dispensing device, and determined by described dispensing device
The number N of described carrier signal；
By including the light sent for the multiple luminaires received from described dispensing device and according to phase
The receiving intensity output answered receives the reception device of the optical receiving device of signal by using N number of carrier wave to believe
Number the described reception signal that exports from described optical receiving device is performed FFT, and extract each carrier wave
N number of modulated signal, wherein said light in transmission line by spatial reuse；And
It is demodulated by each in the described reception device modulated signal to extracting,
Wherein, determine that the number n of described luminaire believes more than described carrier wave when described luminous controling unit
Number number N (N ＜ n) time, described luminous controling unit based on N number of carrier signal one of them stand
Carve and make the multiple equipment in described luminaire luminous.
7. including a signaling method for the dispensing device of multiple luminaire, described signal sends
Method comprises the following steps:
The serial data that can be modulated independently of each other is carried out serioparallel exchange, produces N number of data stream；
By the N number of data stream for each carrier wave produced being modulated with the dimension of predetermined number
Produce N number of modulated signal；
The N number of modulated signal produced is multiplied by N number of quadrature carrier signals respectively, produces N number of transmission and believe
Number；
Make the plurality of luminaire luminous according to the N number of transmission signal produced；And
Determined the number n of described luminaire by described dispensing device, and determined by described dispensing device
The number N of described carrier signal,
Wherein, determine that the number n of described luminaire believes more than described carrier wave when described luminous controling unit
Number number N (N ＜ n) time, described luminous controling unit based on N number of carrier signal one of them stand
Carve and make the multiple equipment in described luminaire luminous.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008298941A JP5486179B2 (en) | 2008-11-25 | 2008-11-25 | Transmitting apparatus, receiving apparatus, signal transmitting method, and signal receiving method |
| JP298941/08 | 2008-11-25 | ||
| PCT/KR2009/006923 WO2010062094A2 (en) | 2008-11-25 | 2009-11-24 | Visible ray communication system, transmission apparatus, and signal transmission method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102224691A CN102224691A (en) | 2011-10-19 |
| CN102224691B true CN102224691B (en) | 2016-11-30 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005354553A (en) * | 2004-06-14 | 2005-12-22 | Nippon Hoso Kyokai <Nhk> | Optical radio transmission method and its device |
| WO2007043789A1 (en) * | 2005-10-12 | 2007-04-19 | Electronics And Telecommunications Research Institute | Apparatus for creating, demodulating, transmitting and receiving othorgonal frequency division multiplexing symbol |
| JP2008252444A (en) * | 2007-03-30 | 2008-10-16 | Samsung Yokohama Research Institute Co Ltd | Optical communication system, optical communication device and optical communication method |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005354553A (en) * | 2004-06-14 | 2005-12-22 | Nippon Hoso Kyokai <Nhk> | Optical radio transmission method and its device |
| WO2007043789A1 (en) * | 2005-10-12 | 2007-04-19 | Electronics And Telecommunications Research Institute | Apparatus for creating, demodulating, transmitting and receiving othorgonal frequency division multiplexing symbol |
| JP2008252444A (en) * | 2007-03-30 | 2008-10-16 | Samsung Yokohama Research Institute Co Ltd | Optical communication system, optical communication device and optical communication method |
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