CN105846896A - Visible light OFDM communication device for infrared compensation total range light modulation - Google Patents
Visible light OFDM communication device for infrared compensation total range light modulation Download PDFInfo
- Publication number
- CN105846896A CN105846896A CN201610320643.3A CN201610320643A CN105846896A CN 105846896 A CN105846896 A CN 105846896A CN 201610320643 A CN201610320643 A CN 201610320643A CN 105846896 A CN105846896 A CN 105846896A
- Authority
- CN
- China
- Prior art keywords
- ofdm
- time slot
- infrared
- light
- light modulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a visible light OFDM communication device for infrared compensation total range light modulation. The visible light OFDM communication device comprises a light modulation pulse generator, an information source, an OFDM modulator, a visible light LED driver, an infrared LED driver, a commercial visible light LED lighting source, a low power infrared LED compensation light source, a photoelectric detector, a light modulation pulse arbiter, a normalization processor, an OFDM demodulator and an information sink. Via the above mode, the visible light OFDM communication device for infrared compensation total range light modulation can realize total range light modulation and transmit OFDM signals, no effects can be exerted on OFDM signal transmission speed rate and quality by light modulation, signal transmission performance of the device can be greatly less independent on a light modulation duty ratio than that of a traditional OFDM communication device, and system complexity can be effectively lowered.
Description
Technical field
The present invention relates to indoor visible light communication device field, particularly relate to a kind of infrared compensation gamut light modulation can
See light ofdm communication device.
Background technology
Energy-conservation LED technology has become the first-selection of current room lighting facility, and LED-based visible light communication is as one
The function kind being attached on room lighting facility, because of its energy-conserving and environment-protective, is not take up radio spectrum resources in short supply, information privacy
The advantage such as good, has become the focus of communications field research the most.OFDM (OFDM) transmission technology has because of it
The advantages such as channel utilization is high, anti-multipath fading ability is strong and implementation complexity is low, have had been widely cited and have led in indoor visible light
In communication system.
Dim the function most basic as room lighting facility, people can be met strong to different illumination in daily life
The needs of degree, it is also possible to reach the purpose of energy-conserving and environment-protective.But traditional based on the dimming mode changing dutycycle in, due to
Information is not transmitted so that communication quality and the transfer rate of ofdm signal are highly dependent on dutycycle in " off " light modulation time slot, this
The normal transmission of ofdm signal is caused tremendous influence.Only light modulation and this conflict of signal normal transmission are effectively solved it
After, the commercialization of the indoor visible ray ofdm communication device that can accurately dim could be promoted.
Patent " CN201410024723 " discloses a kind of dimming light source technology based on ofdm signal, proposes in OFDM system
System use MPPM replace PWM to realize accurately light modulation and transmitting additional information.But still suffer from following weak point:
(1). owing to not transmitting signal at " off " light modulation time slot, when the more low intensive illumination of indoor needs, i.e. dutycycle is relatively
Hour (such as D=10% or 20%), constant for ensureing ofdm signal transfer rate, need to pay the cost that error rate of system increases；Or
Person, for ensureing ofdm signal communication mass conservation, then needs to pay the cost that transfer rate reduces.Therefore, for ensureing OFDM letter
Number normal transmission, dimming scope is by limited, it is impossible to reach gamut；
(2). owing to not transmitting signal at " off " light modulation time slot, when indoor nothing illumination, i.e. during dutycycle D=0%, there is not base
This communication link；
(3). owing to not transmitting signal at " off " light modulation time slot, the ofdm signal in current " on " light modulation slot transmission needs
Treat the ofdm signal of follow-up " on " light modulation time slot, until the signal of " on " light modulation time slot that receives of receiving terminal to be spliced into one whole
During OFDM frame, just can carry out OFDM demodulation, therefore the problem that there is signal propagation delay time；
(4). owing to not accounting for OFDM sub-carrier order of modulation, if changed to keep transfer rate constant
Change the symbol-modulated exponent number of subcarrier while dutycycle, complex circuit designs can be made.
And before last decade, patent " CN200780028988 " is just it is proposed that use visible simultaneously in light is wirelessly transferred
Light and infrared imagination, but, the original intention of this imagination be solve " optic communication of low speed can only be carried out when illuminating lighting " this
Problem.At present, along with developing rapidly of semiconductor technology level, the speed of simple indoor visible light communication the most can reach
Mbit/s up to a hundred even arrive Gbit/s, so, the problem described in current patent " CN200780028988 " is not the most subject matter,
And, this patent there is problems to be needed to solve:
(1). due to by infrared optical link as primary communication link at a high speed, and with visible ray link as the auxiliary of low speed
Communication link, therefore, for reaching the high-speed communication of certain mass, will require that infrared light supply power is higher, thus affect human body
Health, simultaneously, it is seen that the potentiality of the high-speed communication of radiant the most do not obtain effective exploitation；
(2). owing to not possessing LED light source dimming function, thus do not meet the design concept of Modern Indoor Lighting system；
(3). the signal waveform launched due to visible light source and infrared light supply differs completely so that two kinds of signals during reception
Can interfere with each other, such as, when " off " time slot of visible ray, infrared light supply all sends out maximum level, due to corresponding receiver
Imperfection processed, this easily causes misjudgement, affects communication quality；
(4). the marginal position of " on " and " off " light modulation time slot of visible ray cannot be crossed over due to the infrared symbol of two-forty, from
And requiring that infrared signal and visible light pulses signal have to be completely synchronized (i.e. both symbol edges need alignment), this is greatly increased
System complexity；
(5). owing to not using OFDM modulation system so that communication system anti-multipath fading ability is poor；
(6). owing to visible light source and infrared light supply launch signal simultaneously, accepted simultaneously, so when receiving terminal uses two
During photoelectric detector, need to keep signal to synchronize, increase system complexity, and when receiving terminal receives two only with a detector
During the signal of individual wave band, its feasibility and performance are doubtful.
Summary of the invention
The technical problem that present invention mainly solves is to provide the visible ray ofdm communication of a kind of infrared compensation gamut light modulation
Device, reduces system complexity, reduces when dimming ofdm signal transfer rate and the impact of transmission quality.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of infrared compensation gamut
The visible ray ofdm communication device of light modulation, including: dimmer pulse generator, information source, OFDM manipulator, visible LED driver,
Infrared LED driver, commercial visible LED lighting source, low-power infrared LED compensatory light, photoelectric detector, dimmer pulse
Arbiter, normalized device, ofdm demodulator and the stay of two nights, the outfan of described dimmer pulse generator connect respectively described can
Seeing input and the input of infrared LED driver of light LED driver, the outfan of described information source connects described OFDM and adjusts
The input of device processed, the outfan of described OFDM manipulator connects input and the institute of described visible LED driver respectively
Stating the input of infrared LED driver, the outfan of described visible LED driver connects described commercial visible LED illumination
The input of light source, the outfan of described infrared LED driver connects the input of described low-power infrared LED compensatory light,
The output optical signal launch of described commercial visible LED lighting source and described low-power infrared LED compensatory light enters free sky
After between, completely or partially inputting as described photoelectric detector, the outfan of described photoelectric detector connects described dimmer pulse
The input of arbiter, the outfan of described light pulse arbiter connects the input of described normalized device, described normalizing
The outfan changing processor connects the input of described ofdm demodulator, and the outfan of described ofdm demodulator connects the described stay of two nights
Input.
In a preferred embodiment of the present invention, that described dimmer pulse generator produces is in following three kinds of signals
Plant or its mutation: pulse width modulation (PWM) signal, pulse position modulation PPM signal and multi-pulse position modulation MPPM signal.
In a preferred embodiment of the present invention, the described commercial FR accurate light modulation of visible LED lighting source is led to
Crossing the dutycycle of dimmer pulse in change dimmer pulse generator to carry out, described dutycycle is D, and 0%≤D≤100%, described red
The visible ray ofdm communication device of external compensation gamut light modulation dims time slot and " off " light modulation at " on " of dimmer pulse generator
Time slot has continuous print ofdm signal waveform transfer, the described commercial visible LED lighting source transmitting when non-modulated all the time
Luminous power is Pa, and described low-power infrared LED compensatory light is Pb in the transmitting luminous power of non-modulated, and described Pa is much larger than
Pb。
In a preferred embodiment of the present invention, described OFDM manipulator is output as bipolarity ofdm signal f (t), institute
State visible LED driver to be controlled by described dimmer pulse generator and described OFDM manipulator, when " on " dims simultaneously
Gap, ofdm signal is modulated described commercial visible LED lighting source by described visible LED driver, and modulation index is
Ma, so time described commercial visible LED lighting source transmitting luminous power be Pa* (1+Ma*f (t))；When " off " dims
Gap, described commercial visible LED lighting source do not modulated any signal by described visible LED driver, so time described business
Launching luminous power with visible LED lighting source is 0.
In a preferred embodiment of the present invention, described infrared LED driver simultaneously by described dimmer pulse generator and
The control of described OFDM manipulator, dims time slot at " on ", and described low-power infrared LED is not mended by described infrared LED driver
Repay any signal of modulation of source, so time described low-power infrared LED compensatory light transmitting luminous power be 0；Dim at " off "
Time slot, ofdm signal is modulated described low-power infrared LED compensatory light by described infrared LED driver, and modulation index is
Mb, so time described low-power infrared LED compensatory light transmitting luminous power be Pb* (1+Mb*f (t)).
In a preferred embodiment of the present invention, described photoelectric detector dims at " on " light modulation time slot and " off " in turn
Time slot receives described commercial visible LED lighting source and the ofdm signal ripple of described low-power infrared LED compensatory light transmitting
Shape, the number of described photoelectric detector is 1, dims time slot at " on ", and the signal of telecommunication of described photoelectric detector output is Ra*Ha
(0) * Pa* (1+Ma*f (t)), dims time slot at " off ", and the signal of telecommunication of described photoelectric detector output is Rb*Hb (0) * Pb* (1
+ Mb*f (t)), wherein Ra, Rb are that described photoelectric detector turns at the photoelectricity of the visible light wave range used and infrared band respectively
Changing efficiency, Ha (0) and Hb (0) is the channel DC current gain of used visible light wave range and infrared band respectively, as described business
With visible LED lighting source and described low-power infrared LED compensatory light installation site near time, Ha (0) and Hb (0) is considered as phase
Deng.
In a preferred embodiment of the present invention, the telecommunications that described dimmer pulse arbiter exports according to photoelectric detector
Number, when coming automatic discrimination " on " light modulation time slot and " off " light modulation with decision threshold 0.5* (Ra*Ha (0) * Pa+Rb*Hb (0) * Pb)
Gap, if this time slot average electrical signal amplitude is more than or equal to decision threshold, is then judged to that " on " dims time slot, otherwise, it is determined that be
" off " dims time slot.
In a preferred embodiment of the present invention, described dimmer pulse arbiter is realized by the following method judgement: often
Individual total timeslot number be n light modulation code element in select the maximum time slot of nD pulse amplitude and be judged to that " on " dims time slot, will residue
N (1-D) time slot is judged to that " off " dims time slot.
In a preferred embodiment of the present invention, described normalized device is according to the differentiation of described dimmer pulse arbiter
As a result, the waveform in " on " light modulation time slot and " off " light modulation time slot is carried out different process, during for being judged to that " on " dims
Waveform in gap, first removes DC component, then divided by normalization factor Ga, obtains normalization OFDM waveform f (t), wherein
Ga=Ra* Ha(0)*Pa*Ma；For the waveform being judged in " off " light modulation time slot, first remove DC component, then divided by
Normalization factor Gb, obtains normalization OFDM waveform f (t), wherein Gb=Rb*Hb (0) * Pb*Mb.
In a preferred embodiment of the present invention, normalization OFDM waveform f (t) input of described normalized device output
To described ofdm signal demodulator, f (t) is directly demodulated, and demodulation result is exported by described ofdm signal demodulator
The stay of two nights.
The invention has the beneficial effects as follows: the visible ray ofdm communication of a kind of infrared compensation gamut light modulation that the present invention points out
Device, both can transmit ofdm signal, can carry out again dimming accurately between dimming duty cycle 0% to 100%, and several during light modulation
Transfer rate, the transmission quality of ofdm signal is not impacted, even if in the case of 0% dutycycle (turning off the light), also can carry out
Normal OFDM data transmission, the order of modulation of OFDM sub-carrier can keep constant, simplify circuit design, normalization
Processor makes same ofdm signal can cross over " on " light modulation time slot and the marginal position of " off " light modulation time slot, therefore is not required to
Wanting realization between ofdm signal with dimmer pulse Tong Bu, the misjudgement that so can be substantially reduced in traditional scheme demodulating process is general
Rate, and effectively reduce system complexity, be prevented effectively from tradition dimming arrangement because of " off " dim time slot do not transmit ofdm signal and
The transmission delay brought, uses power difference significantly commercial visible LED lighting source and low-power infrared LED to compensate light
Source, both can meet the needs of room lighting, can ensure that again human body is not by infrared injury, it is also possible to meet the need of signal demodulation
, bipolarity ofdm signal f (t) of employing will not produce any impact, and system anti-multipath fading energy to the accuracy of light modulation
Power is strong, and receiving terminal is only with a photoelectric detector, therefore avoids the signal stationary problem used between multiple photoelectric detectors,
Visible light signal and infrared signal send at " on " light modulation time slot and " off " light modulation time slot in turn, it also avoid only with one
The performance that detector detects multi-wave signal simultaneously and brings is uncertain.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing, wherein:
Fig. 1 is that the structure of visible ray ofdm communication device one preferred embodiment of a kind of infrared compensation gamut of present invention light modulation is shown
It is intended to；
Fig. 2 is that ofdm signal is at transmitting terminal and the concrete waveform diagram of receiving terminal；
Fig. 3 be transfer rate constant time, the order of modulation of OFDM sub-carrier under different dimming duty cycle；
Fig. 4 be the order of modulation of transfer rate and OFDM sub-carrier the most constant time, the OFDM under different dimming duty cycle
The Simulated BER of signal.
Detailed description of the invention
Technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described enforcement
Example is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, this area is common
All other embodiments that technical staff is obtained under not making creative work premise, broadly fall into the model of present invention protection
Enclose.
Referring to Fig. 1 to Fig. 4, the embodiment of the present invention includes:
A kind of visible ray ofdm communication device of infrared compensation gamut light modulation, as it is shown in figure 1, include: dimmer pulse generator,
Information source, OFDM manipulator, visible LED driver, infrared LED driver, commercial visible LED lighting source, low-power are red
Outer LED compensatory light, photoelectric detector, dimmer pulse arbiter, normalized device, ofdm demodulator and the stay of two nights, described tune
The outfan of light pulse generator connects the input of described visible LED driver and the defeated of infrared LED driver respectively
Entering end, the outfan of described information source connects the input of described OFDM manipulator, and the outfan of described OFDM manipulator connects respectively
Connecing input and the input of described infrared LED driver of described visible LED driver, described visible LED drives
The outfan of device connects the input of described commercial visible LED lighting source, and the outfan of described infrared LED driver connects
The input of described low-power infrared LED compensatory light, described commercial visible LED lighting source and described low-power are infrared
After the output optical signal launch of LED compensatory light enters free space, completely or partially input as described photoelectric detector, described
The outfan of photoelectric detector connects the input of described dimmer pulse arbiter, and the outfan of described light pulse arbiter connects
The input of described normalized device, the outfan of described normalized device connects the input of described ofdm demodulator,
The outfan of described ofdm demodulator connects the input of the described stay of two nights.
The thinking of the present invention is based on tradition visible light communication dimming arrangement, uses a low-power infrared compensation communication chain
Road, makes device have continuous print ofdm signal waveform transfer all the time at " on " light modulation time slot and " off " light modulation time slot, the most just can
Effectively solve " off " light modulation time slot in traditional scheme and do not transmit the awkward situation of any signal, and avoid signal synchronization and delay etc. to ask
Topic, reduces system complexity.
The ofdm signal of apparatus of the present invention at the concrete waveform diagram of transmitting terminal and receiving terminal as in figure 2 it is shown, false here
If accurately dimming duty cycle is 55.5%, in the most every 9 light modulation time slots, 5 are had to dim time slot for " on ".At transmitting terminal, information source is sent out
After the binary bit stream gone out enters described OFDM manipulator, it is modulated into bipolarity ofdm signal.Time slot is dimmed at " on ",
Ofdm signal f (t) is only modulated described commercial visible LED lighting source by described visible LED driver, therefore launches light merit
Rate is Pa* (1+Ma*f (t))；Dimming time slot at " off ", ofdm signal is only modulated described business by described infrared LED driver
Use visible LED lighting source, therefore launching luminous power is Pb* (1+Mb*f (t)).Meanwhile, adjust at " on " light modulation time slot and " off "
The ofdm signal waveform of light slot transmission is continuous, and speed is identical.It addition, described commercial visible LED lighting source and described low
It is notable that power infrared LED compensatory light launches light-intensity difference, it can be ensured that health also meets illumination and the needs of signal demodulation,
Described low-power infrared LED compensatory light is launched light intensity and is met international standard International Electrotechnical
IEC60825-1 and American National Standards Institute (ANSI) that Commission (IEC) specifies
The ANSI Z136.1 of regulation.
It should be noted that continuous print OFDM waveform is carried on dimmer pulse, it is not required that tight between waveform and pulse
Lattice align, so, it is considered to the normalized device that receiving terminal uses, this will be prevented effectively from the problem that signal synchronizes.Simultaneously need to
It is noted that in tradition dimming arrangement, each ofdm signal needs the signal waiting a whole frame length all to receive just can enter
Row demodulation, owing to " off " time slot does not transmit ofdm signal, the transmission delay brought can not be ignored.And in the present invention, at continuous print
" on " and " off " light modulation time slot all has waveform continuous print ofdm signal to be transmitted, and so can be prevented effectively from the delay of transmission
Problem.It should also be noted that ambipolar ofdm signal is carried on visible ray dimmer pulse, do not change visible LED
Average emitted luminous power, thus OFDM transmission to light modulation accuracy have no effect.
At receiving terminal, a described photoelectric detector is used to receive at " on " light modulation time slot and " off " light modulation time slot in turn
The ofdm signal waveform that described commercial visible LED lighting source and described low-power infrared LED compensatory light are launched.Now,
Optical signal by free space, is no need for considering further that illumination, ensuing problem are how to demodulate the ofdm signal received.
It is found that no matter dim time slot at " on " or " off ", although the ofdm signal received and transmitting terminal original OFDM signal are not
With, but the shape of the waveform in each time slot is identical, and the information of original OFDM signal is exactly included in these and rises and falls
In the waveform of change.Dimming time slot at " on ", the signal of telecommunication of described photoelectric detector output is Ra*Ha (0) * Pa* (1+Ma*f
(t))；And dimming time slot at " off ", the signal of telecommunication that described photoelectric detector (8) exports is Rb*Hb (0) * Pb* (1+Mb*f
(t)).It was found that because electrical signal amplitude difference is bigger in " on " light modulation time slot and " off " dim time slot, it is possible to take
Both midpoints, i.e. with decision threshold 0.5* (Ra*Ha (0) * Pa+Rb*Hb (0) * Pb) come automatic discrimination " on " light modulation time slot and
" off " dims time slot.If this time slot average electrical signal amplitude is more than or equal to decision threshold, then it is judged to " on " time slot；Otherwise,
It is judged to " off " time slot.
Described dimmer pulse arbiter can also be realized by the following method judgement: is the light modulation of n at each total timeslot number
Code element is selected the maximum time slot of nD pulse amplitude and is judged to " on " time slot, when residue n (1-D) time slot is judged to " off "
Gap.
It follows that described normalized device is according to the differentiation result of described dimmer pulse arbiter, to " on " and " off "
Waveform in time slot carries out different process, and concrete scheme is as follows: for the waveform being judged in " on " time slot, first removes straight
Flow component, then divided by normalization factor Ga, obtains normalization waveform f (t), wherein Ga=Ra*Ha (0) * Pa*Ma；For judging
For the waveform in " off " time slot, first remove DC component, then divided by normalization factor Gb, obtain normalization waveform f (t),
Wherein Gb=Rb*Hb (0) * Pb*Mb.Finally, by normalization OFDM waveform f (t) input from described normalized device output
To described ofdm signal demodulator, f (t) is directly demodulated, and demodulation result is exported by described ofdm signal demodulator
The stay of two nights.
When ofdm signal transfer rate constant for 50Mbit/s time, apparatus of the present invention use under different dimming duty cycle
The order of modulation of OFDM sub-carrier is as it is shown on figure 3, the most only illustrate and illustrate as a example by MQAM.It can be seen that OFDM
The order of modulation of sub-carrier constant can remain 4 under different dimming duty cycle, and this will be greatly simplified communication system electricity
The design on road.
When ofdm signal transfer rate is constant for 50Mbit/s, and the order of modulation of OFDM sub-carrier dims in difference
Under dutycycle constant when remaining 4, this device Simulated BER under different dimming duty cycle is as shown in Figure 4.The most permissible
Finding out, when any dutycycle lowers light, communication bit error rates all can reach 10-4Below the order of magnitude, this illustrates that light modulation is to system
The impact of communication quality is almost negligible.
In sum, the visible ray ofdm communication device of a kind of infrared compensation gamut light modulation that the present invention points out, install
In indoor, it is possible to make interior lighting system carry out the normal transmission of ofdm signal, simple in construction, letter while gamut dims
Number transmission is stable, and the injury to human body is negligible.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description is made convert, or are directly or indirectly used in other relevant technology neck
Territory, is the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. the visible ray ofdm communication device of one kind infrared compensation gamut light modulation, it is characterised in that including: dimmer pulse produces
Device, information source, OFDM manipulator, visible LED driver, infrared LED driver, commercial visible LED lighting source, low-power
Infrared LED compensatory light, photoelectric detector, dimmer pulse arbiter, normalized device, ofdm demodulator and the stay of two nights, described
The outfan of dimmer pulse generator connects the input of described visible LED driver and infrared LED driver respectively
Input, the outfan of described information source connects the input of described OFDM manipulator, and the outfan of described OFDM manipulator is respectively
Connecting input and the input of described infrared LED driver of described visible LED driver, described visible LED drives
The outfan of dynamic device connects the input of described commercial visible LED lighting source, and the outfan of described infrared LED driver is even
Connecing the input of described low-power infrared LED compensatory light, described commercial visible LED lighting source and described low-power are infrared
After the output optical signal launch of LED compensatory light enters free space, completely or partially input as described photoelectric detector, described
The outfan of photoelectric detector connects the input of described dimmer pulse arbiter, and the outfan of described light pulse arbiter connects
The input of described normalized device, the outfan of described normalized device connects the input of described ofdm demodulator,
The outfan of described ofdm demodulator connects the input of the described stay of two nights.
The visible ray ofdm communication device of infrared compensation gamut the most according to claim 1 light modulation, it is characterised in that institute
State the generation of dimmer pulse generator is the one in following three kinds of signals or its mutation: pulse width modulation (PWM) signal, arteries and veins
Rush position modulation PPM signal and multi-pulse position modulation MPPM signal.
The visible ray ofdm communication device of infrared compensation gamut the most according to claim 1 light modulation, it is characterised in that institute
State the commercial FR accurate light modulation of visible LED lighting source by changing the duty of dimmer pulse in dimmer pulse generator
Ratio is carried out, and described dutycycle is D, and 0%≤D≤100%, the visible ray ofdm communication device of described infrared compensation gamut light modulation
Dim time slot at " on " of dimmer pulse generator and have continuous print ofdm signal waveform transfer, institute all the time with " off " light modulation time slot
Stating the commercial visible LED lighting source transmitting luminous power when non-modulated is Pa, described low-power infrared LED compensatory light
Transmitting luminous power in non-modulated is Pb, and described Pa is much larger than Pb.
The visible ray ofdm communication device of infrared compensation gamut the most according to claim 3 light modulation, it is characterised in that institute
Stating OFDM manipulator and be output as bipolarity ofdm signal f (t), described visible LED driver is simultaneously by described dimmer pulse
Generator and the control of described OFDM manipulator, dim time slot at " on ", and ofdm signal is modulated by described visible LED driver
To described commercial visible LED lighting source, and modulation index is Ma, so time described commercial visible LED lighting source
Transmitting luminous power is Pa* (1+Ma*f (t))；Dimming time slot at " off ", described visible LED driver can not to described commercialization
See that light LED illumination light source modulates any signal, so time described commercial visible LED lighting source to launch luminous power be 0.
The visible ray ofdm communication device of infrared compensation gamut the most according to claim 4 light modulation, it is characterised in that institute
State infrared LED driver to be controlled by described dimmer pulse generator and described OFDM manipulator simultaneously, dim time slot at " on ",
Described infrared LED driver not to described low-power infrared LED compensatory light modulate any signal, so time described low-power red
The transmitting luminous power of outer LED compensatory light is 0；Dimming time slot at " off ", ofdm signal is modulated by described infrared LED driver
To described low-power infrared LED compensatory light, and modulation index is Mb, so time described low-power infrared LED compensatory light
Transmitting luminous power is Pb* (1+Mb*f (t)).
The visible ray ofdm communication device of infrared compensation gamut the most according to claim 5 light modulation, it is characterised in that institute
State photoelectric detector in turn " on " light modulation time slot and " off " light modulation time slot receive described commercial visible LED lighting source and
The ofdm signal waveform that described low-power infrared LED compensatory light is launched, the number of described photoelectric detector is 1, adjusts at " on "
Light time slot, the signal of telecommunication of described photoelectric detector output is Ra*Ha (0) * Pa* (1+Ma*f (t)), dims time slot, institute at " off "
The signal of telecommunication stating photoelectric detector output is Rb*Hb (0) * Pb* (1+Mb*f (t)), and wherein Ra, Rb are described Photoelectric Detection respectively
Device is in the visible light wave range used and the photoelectric transformation efficiency of infrared band, and Ha (0) and Hb (0) is used visible respectively
The channel DC current gain of optical band and infrared band, when described commercial visible LED lighting source and described low-power infrared LED
When compensatory light installation site is near, Ha (0) and Hb (0) is considered as equal.
The visible ray ofdm communication device of infrared compensation gamut the most according to claim 6 light modulation, it is characterised in that institute
State the signal of telecommunication that dimmer pulse arbiter exports according to photoelectric detector, with decision threshold 0.5* (Ra*Ha (0) * Pa+Rb*Hb
(0) * Pb) come automatic discrimination " on " light modulation time slot and " off " light modulation time slot, if this time slot average electrical signal amplitude is more than or equal to
Decision threshold, then be judged to that " on " dims time slot, otherwise, it is determined that be that " off " dims time slot.
The visible ray ofdm communication device of infrared compensation gamut the most according to claim 6 light modulation, it is characterised in that institute
State dimmer pulse arbiter and be realized by the following method judgement: in the light modulation code element that each total timeslot number is n, select nD arteries and veins
Rush the maximum time slot of amplitude and be judged to that " on " dims time slot, residue n (1-D) time slot is judged to that " off " dims time slot.
9. the visible ray ofdm communication device dimmed according to the infrared compensation gamut described in claim 7 or 8, its feature exists
In, " on " light modulation time slot and " off ", according to the differentiation result of described dimmer pulse arbiter, are adjusted by described normalized device
Waveform in light time slot carries out different process, for being judged to that " on " dims the waveform in time slot, first removes DC component,
Then divided by normalization factor Ga, normalization OFDM waveform f (t) is obtained, wherein Ga=Ra* Ha (0) * Pa*Ma；For being judged to
Waveform in " off " light modulation time slot, first removes DC component, then divided by normalization factor Gb, obtains normalization OFDM ripple
Shape f (t), wherein Gb=Rb*Hb (0) * Pb*Mb.
The visible ray ofdm communication device of infrared compensation gamut the most according to claim 9 light modulation, it is characterised in that
Normalization OFDM waveform f (t) of described normalized device output is input to described ofdm signal demodulator, described ofdm signal
F (t) is directly demodulated by demodulator, and demodulation result is exported the stay of two nights.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610320643.3A CN105846896B (en) | 2016-05-16 | 2016-05-16 | A kind of visible ray ofdm communication device of infrared compensation gamut light modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610320643.3A CN105846896B (en) | 2016-05-16 | 2016-05-16 | A kind of visible ray ofdm communication device of infrared compensation gamut light modulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105846896A true CN105846896A (en) | 2016-08-10 |
| CN105846896B CN105846896B (en) | 2017-12-26 |
Family
ID=56592356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610320643.3A Active CN105846896B (en) | 2016-05-16 | 2016-05-16 | A kind of visible ray ofdm communication device of infrared compensation gamut light modulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105846896B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111310541A (en) * | 2019-11-27 | 2020-06-19 | Oppo广东移动通信有限公司 | Scene prediction method, terminal and storage medium |
| CN111492598A (en) * | 2018-01-08 | 2020-08-04 | 华为技术有限公司 | Camera communication method and device |
| CN111628824A (en) * | 2020-06-28 | 2020-09-04 | 欧梯恩智能科技(苏州)有限公司 | Photon thing networking lighting base station |
| CN112787722A (en) * | 2021-03-12 | 2021-05-11 | 苏州大学 | Self-adaptive dimming visible light communication system and modulation and demodulation method |
| CN113514903A (en) * | 2021-06-29 | 2021-10-19 | 昆山亚伯兰软件科技有限公司 | Infrared correlation tube power compensation method and system |
| US11190275B2 (en) | 2017-06-30 | 2021-11-30 | Purelifi Limited | Optical wireless communication system and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101350666A (en) * | 2002-10-24 | 2009-01-21 | 株式会社中川研究所 | Illumination light communication device |
| CN101502013A (en) * | 2006-10-23 | 2009-08-05 | 松下电器产业株式会社 | Optical space transmission system using visible light and infrared light |
| JP2011234204A (en) * | 2010-04-28 | 2011-11-17 | Tamura Seisakusho Co Ltd | Optical communication system having light emission power control function |
| CN103746769A (en) * | 2013-10-08 | 2014-04-23 | 上海交通大学 | Adaptive OFDM modulation system for raising capacity of visible light communication system |
| CN105162516A (en) * | 2015-06-10 | 2015-12-16 | 林新 | LED lighting communication device and LED lighting communication system |
| CN205754336U (en) * | 2016-05-16 | 2016-11-30 | 苏州安莱光电科技有限公司 | A kind of visible ray ofdm communication device of infrared compensation gamut light modulation |
-
2016
- 2016-05-16 CN CN201610320643.3A patent/CN105846896B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101350666A (en) * | 2002-10-24 | 2009-01-21 | 株式会社中川研究所 | Illumination light communication device |
| CN101502013A (en) * | 2006-10-23 | 2009-08-05 | 松下电器产业株式会社 | Optical space transmission system using visible light and infrared light |
| JP2011234204A (en) * | 2010-04-28 | 2011-11-17 | Tamura Seisakusho Co Ltd | Optical communication system having light emission power control function |
| CN103746769A (en) * | 2013-10-08 | 2014-04-23 | 上海交通大学 | Adaptive OFDM modulation system for raising capacity of visible light communication system |
| CN105162516A (en) * | 2015-06-10 | 2015-12-16 | 林新 | LED lighting communication device and LED lighting communication system |
| CN205754336U (en) * | 2016-05-16 | 2016-11-30 | 苏州安莱光电科技有限公司 | A kind of visible ray ofdm communication device of infrared compensation gamut light modulation |
Non-Patent Citations (1)
| Title |
|---|
| XIAODI YOU 等: "Efficient Data Transmission Using MPPM Dimming Control in Indoor Visible Light Communication", 《IEEE PHOTONICS JOURNAL》 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3646487B1 (en) * | 2017-06-30 | 2024-10-23 | PureLiFi Limited | Optical wireless communication system and method |
| US11190275B2 (en) | 2017-06-30 | 2021-11-30 | Purelifi Limited | Optical wireless communication system and method |
| CN111492598A (en) * | 2018-01-08 | 2020-08-04 | 华为技术有限公司 | Camera communication method and device |
| US11025342B2 (en) | 2018-01-08 | 2021-06-01 | Huawei Technologies Co., Ltd. | Camera communication method and apparatus |
| CN111492598B (en) * | 2018-01-08 | 2021-07-09 | 华为技术有限公司 | Camera communication method and device |
| CN111310541B (en) * | 2019-11-27 | 2023-09-29 | Oppo广东移动通信有限公司 | Scene prediction method, terminal and storage medium |
| CN111310541A (en) * | 2019-11-27 | 2020-06-19 | Oppo广东移动通信有限公司 | Scene prediction method, terminal and storage medium |
| CN111628824A (en) * | 2020-06-28 | 2020-09-04 | 欧梯恩智能科技(苏州)有限公司 | Photon thing networking lighting base station |
| CN111628824B (en) * | 2020-06-28 | 2021-10-08 | 欧梯恩智能科技(苏州)有限公司 | Photon thing networking lighting base station |
| CN112787722A (en) * | 2021-03-12 | 2021-05-11 | 苏州大学 | Self-adaptive dimming visible light communication system and modulation and demodulation method |
| WO2022188243A1 (en) * | 2021-03-12 | 2022-09-15 | 苏州大学 | Adaptive-dimming visible light communication system and modulation and demodulation method |
| US20230283373A1 (en) * | 2021-03-12 | 2023-09-07 | Soochow University | Visible light communication system with adaptive dimming and modulation and demodulation method |
| CN112787722B (en) * | 2021-03-12 | 2021-12-28 | 苏州大学 | Self-adaptive dimming visible light communication system and modulation and demodulation method |
| US11909440B2 (en) * | 2021-03-12 | 2024-02-20 | Soochow University | Visible light communication system with adaptive dimming and modulation and demodulation method |
| CN113514903A (en) * | 2021-06-29 | 2021-10-19 | 昆山亚伯兰软件科技有限公司 | Infrared correlation tube power compensation method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105846896B (en) | 2017-12-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105846896A (en) | Visible light OFDM communication device for infrared compensation total range light modulation | |
| Chow et al. | Digital signal processing for light emitting diode based visible light communication | |
| CN102457331B (en) | Method for utilizing LED illumination light to realize wireless local area network communication | |
| Sugiyama et al. | Experimental investigation of modulation method for visible-light communications | |
| US20100111538A1 (en) | Illuminating light communication device | |
| Delgado et al. | Design and implementation of an Ethernet-VLC interface for broadcast transmissions | |
| Ma et al. | Appropriate modulation scheme for visible light communication systems considering illumination | |
| CN204089821U (en) | A kind of visible light communication system | |
| CN110166123B (en) | Mixed visible light modulation method compatible with dimming control | |
| EP3491750A1 (en) | Method of dimming for visible light communications | |
| CN106301561A (en) | A kind of wireless light communication device based on illumination LED and control method thereof | |
| Choudhari et al. | High sensitivity universal Lifi receiver for enhance data communication | |
| CN104022822A (en) | RGB-type LED-based visible light communication frequency modulation method | |
| CN103840876B (en) | visible light communication method and system | |
| Choi | Analysis of VLC channel based on the shapes of white-light LED lighting | |
| CN201414133Y (en) | Signal strength display device and bridge | |
| Knobloch | Channel gain and frame error rate for optical street lighting communication | |
| CN205754336U (en) | A kind of visible ray ofdm communication device of infrared compensation gamut light modulation | |
| Ahfayd et al. | Visible light communication based on offset pulse position modulation (Offset-PPM) using high power LED | |
| Han et al. | Design of 100Mbps white light LED based visible light communication system | |
| Mao et al. | A mixed-interval multi-pulse position modulation scheme for real-time visible light communication system | |
| KR101389770B1 (en) | Modulation scheme and demodulator in visible light communication | |
| Rîurean et al. | A small step in VLC systems–a big step in Li-Fi implementation | |
| Yang et al. | Hybrid visible light communications (VLC) and PLC system | |
| Otte et al. | Wireless optical PPM telemetry and the influence of lighting flicker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |