CN205754336U - A kind of visible ray ofdm communication device of infrared compensation gamut light modulation - Google Patents
A kind of visible ray ofdm communication device of infrared compensation gamut light modulation Download PDFInfo
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- CN205754336U CN205754336U CN201620439576.2U CN201620439576U CN205754336U CN 205754336 U CN205754336 U CN 205754336U CN 201620439576 U CN201620439576 U CN 201620439576U CN 205754336 U CN205754336 U CN 205754336U
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- 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]
Abstract
The utility model discloses the visible ray ofdm communication device of a kind of infrared compensation gamut 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.By the way, the visible ray ofdm communication device of infrared compensation gamut described in the utility model light modulation, not only can be with gamut light modulation but also ofdm signal can be transmitted, and hardly transfer rate, the transmission quality of ofdm signal is impacted during light modulation, it is substantially reduced the signal transmission performance dependency to dimming duty cycle in traditional scheme, and effectively reduces system complexity.
Description
Technical field
This utility model relates to indoor visible light communication device field, particularly relates to the light modulation of a kind of infrared compensation gamut
Visible ray 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. duty
(such as D=10% or 20%) time smaller, constant for ensureing ofdm signal transfer rate, need to pay the generation that error rate of system increases
Valency；Or, for ensureing ofdm signal communication mass conservation, then need to pay the cost that transfer rate reduces.Therefore, for ensureing
Ofdm signal 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%, do not deposit
At basic 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
Wait 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 individual 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 in order to keep transfer rate constant and
Change the symbol-modulated exponent number of subcarrier while changing 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 low speed
Auxiliary communication link, therefore, for reaching the high-speed communication of certain mass, will require that infrared light supply power is higher, thus affect
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 during reception two kinds
Signal can interfere with each other, and such as, when " off " time slot of visible ray, infrared light supply all sends out maximum level, owing to connecing accordingly
Receiving mechanism imperfection, this easily causes misjudgement, affects communication quality；
(4). the margin location of " on " and " off " light modulation time slot of visible ray cannot be crossed over due to the infrared symbol of two-forty
Putting, thus it requires infrared signal and visible light pulses signal have to be completely synchronized (i.e. both symbol edges need alignment), this is big
Add greatly 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
During two photoelectric detectors, need to keep signal to synchronize, increase system complexity, and when receiving terminal connects only with a detector
When receiving the signal of two wave bands, its feasibility and performance are doubtful.
Utility model content
This utility model is mainly solving the technical problems that provide the visible ray OFDM that a kind of infrared compensation gamut dims
Communicator, 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 this utility model uses is: provide a kind of infrared compensation complete
The visible ray ofdm communication device of scope light modulation, including: dimmer pulse generator, information source, OFDM manipulator, visible LED drive
Dynamic device, infrared LED driver, commercial visible LED lighting source, low-power infrared LED compensatory light, photoelectric detector, tune
Light pulse arbiter, normalized device, ofdm demodulator and the stay of two nights, the outfan of described dimmer pulse generator connects respectively
The input of described visible LED driver and the input of infrared LED driver, the outfan of described information source connects described
The input of OFDM manipulator, the outfan of described OFDM manipulator connects the input of described visible LED driver respectively
And the input of described infrared LED driver, the outfan of described visible LED driver connects described commercial visible ray
The input of LED illumination light source, the outfan of described infrared LED driver connects described low-power infrared LED compensatory light
Input, the output optical signal launch of described commercial visible LED lighting source and described low-power infrared LED compensatory light enters
After free space, completely or partially inputting as described photoelectric detector, the outfan of described photoelectric detector connects described tune
The input of light pulse arbiter, the outfan of described light pulse arbiter connects the input of described normalized device, institute
The outfan stating normalized device connects the input of described ofdm demodulator, and the outfan of described ofdm demodulator connects institute
State the input of the stay of two nights.
In one preferred embodiment of this utility model, what described dimmer pulse generator produced is in following three kinds of signals
One or its mutation: pulse width modulation (PWM) signal, pulse position modulation PPM signal and multi-pulse position modulation MPPM
Signal.
In one preferred embodiment of this utility model, the described commercial FR accurate tune of visible LED lighting source
Light is carried out by changing the dutycycle of dimmer pulse in dimmer pulse generator, and described dutycycle is D, and 0%≤D≤100%, institute
The visible ray ofdm communication device stating the light modulation of infrared compensation gamut dims time slot and " off " at " on " of dimmer pulse generator
Light modulation time slot has continuous print ofdm signal waveform transfer all the time, and described commercial visible LED lighting source is when non-modulated
Transmitting 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 long-range
In Pb.
In one preferred embodiment of this utility model, described OFDM manipulator is output as bipolarity ofdm signal f
T (), described visible LED driver is controlled, at " on " by described dimmer pulse generator and described OFDM manipulator simultaneously
Light modulation time slot, ofdm signal is modulated described commercial visible LED lighting source, and modulation by described visible LED driver
Index is Ma, so time described commercial visible LED lighting source transmitting luminous power be Pa* (1+Ma*f (t))；At " off "
Dimming time slot, described commercial visible LED lighting source is not modulated any signal by described visible LED driver, so time
Luminous power launched by described commercial visible LED lighting source is 0.
In one preferred embodiment of this utility model, described infrared LED driver is produced by described dimmer pulse simultaneously
Device and the control of described OFDM manipulator, dim time slot at " on ", and described infrared LED driver is not infrared to described low-power
LED compensatory light modulate any signal, so time described low-power infrared LED compensatory light transmitting luminous power be 0；?
" off " dims time slot, and ofdm signal is modulated described low-power infrared LED compensatory light by described infrared LED driver, and adjusts
Index processed is Mb, so time described low-power infrared LED compensatory light transmitting luminous power be Pb* (1+Mb*f (t)).
In one preferred embodiment of this utility model, described photoelectric detector is in turn at " on " light modulation time slot and " off "
Light modulation time slot receives the OFDM letter of described commercial visible LED lighting source and the transmitting of described low-power infrared LED compensatory light
Number waveform, 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 is at the visible light wave range used and the photoelectricity of infrared band respectively
Conversion efficiency, Ha (0) and Hb (0) is the channel DC current gain of used visible light wave range and infrared band respectively, when described
When commercial visible LED lighting source and described low-power infrared LED compensatory light installation site are near, Ha (0) and Hb (0) is considered as
Equal.
In one preferred embodiment of this utility model, the electricity that described dimmer pulse arbiter exports according to photoelectric detector
Signal, carrys out automatic discrimination " on " light modulation time slot with decision threshold 0.5* (Ra*Ha (0) * Pa+Rb*Hb (0) * Pb) and " off " dims
Time slot, 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
Time slot is dimmed for " off ".
In one preferred embodiment of this utility model, described dimmer pulse arbiter is realized by the following method adjudicating:
In the light modulation code element that each total timeslot number is n, select the maximum time slot of nD pulse amplitude be judged to that " on " dims time slot, will
Residue n (1-D) time slot is judged to that " off " dims time slot.
In one preferred embodiment of this utility model, described normalized device is according to described dimmer pulse arbiter
Differentiate result, the waveform in " on " light modulation time slot and " off " light modulation time slot is carried out different process, for being judged to that " on " adjusts
Waveform in light time slot, first removes DC component, then divided by normalization factor Ga, obtains normalization OFDM waveform f (t),
Wherein Ga=Ra* Ha (0) * Pa*Ma；For being judged to that " off " dims the waveform in time slot, first remove DC component, then
Divided by normalization factor Gb, obtain normalization OFDM waveform f (t), wherein Gb=Rb*Hb (0) * Pb*Mb.
In one preferred embodiment of this utility model, normalization OFDM waveform f (t) of described normalized device output
Being input to described ofdm signal demodulator, f (t) is directly demodulated by described ofdm signal demodulator, and demodulation result is defeated
Go out to the stay of two nights.
The beneficial effects of the utility model are: the visible ray of a kind of infrared compensation gamut light modulation that this utility model is pointed out
Ofdm communication device, both can transmit ofdm signal, can carry out again dimming accurately between dimming duty cycle 0% to 100%, and
Hardly transfer rate, the transmission quality of ofdm signal is impacted during light modulation, 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 and set
Meter, normalized device makes same ofdm signal can cross over " on " light modulation time slot and the margin location of " off " light modulation time slot
Put, therefore it is Tong Bu to need not realization between ofdm signal with dimmer pulse, so can be substantially reduced in traditional scheme demodulating process
Misjudgement probability, and effectively reduce system complexity, be prevented effectively from tradition dimming arrangement and do not transmit because " off " dims time slot
Ofdm signal and the transmission delay brought, use power difference significantly commercial visible LED lighting source and low-power infrared
LED compensatory light, 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 letter
Number demodulation needs, bipolarity ofdm signal f (t) of employing will not on light modulation accuracy produce any impact, and system resist
Multipath fading ability is strong, and receiving terminal is only with a photoelectric detector, therefore avoids the letter used between multiple photoelectric detectors
Number stationary problem, it is seen that optical signal and infrared signal send at " on " light modulation time slot and " off " light modulation time slot in turn, also avoid
The performance simultaneously detecting multi-wave signal only with a detector and bring is uncertain.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in this utility model embodiment, required in embodiment being described below
Accompanying drawing to be used is briefly described, it should be apparent that, the accompanying drawing in describing below is only realities more of the present utility model
Execute example, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to these accompanying drawings
Obtain other accompanying drawing, wherein:
Fig. 1 is visible ray ofdm communication device one preferred embodiment of a kind of infrared compensation gamut of this utility model light modulation
Structural representation；
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, under different dimming duty cycle
The Simulated BER of ofdm signal.
Detailed description of the invention
Technical scheme in this utility model embodiment will be clearly and completely described below, it is clear that described
Embodiment is only a part of embodiment of the present utility model rather than whole embodiments.Based on the enforcement in this utility model
Example, all other embodiments that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into
The scope of this utility model protection.
Referring to Fig. 1 to Fig. 4, this utility model embodiment includes:
The visible ray ofdm communication device of a kind of infrared compensation gamut light modulation, as it is shown in figure 1, include: dimmer pulse produces
Raw device, information source, OFDM manipulator, visible LED driver, infrared LED driver, commercial visible LED lighting source, low merit
Rate infrared LED compensatory light, photoelectric detector, dimmer pulse arbiter, normalized device, ofdm demodulator and the stay of two nights, institute
The outfan stating dimmer pulse generator connects input and the infrared LED driver of described visible LED driver respectively
Input, the outfan of described information source connects the input of described OFDM manipulator, and the outfan of described OFDM manipulator divides
Do not connect input and the input of described infrared LED driver, the described visible LED of described visible LED driver
The outfan of driver connects the input of described commercial visible LED lighting source, the outfan of described infrared LED driver
Connecting the input of described low-power infrared LED compensatory light, described commercial visible LED lighting source and described low-power are red
After the output optical signal launch of outer LED compensatory light enters free space, completely or partially input as described photoelectric detector, institute
The outfan stating photoelectric detector connects the input of described dimmer pulse arbiter, and the outfan of described light pulse arbiter is even
Connecing the input of described normalized device, the outfan of described normalized device connects the input of described ofdm demodulator
End, the outfan of described ofdm demodulator connects the input of the described stay of two nights.
Thinking of the present utility model is based on tradition visible light communication dimming arrangement, uses an infrared compensation of low-power to lead to
Letter link, makes device have continuous print ofdm signal waveform transfer all the time, so at " on " light modulation time slot and " off " light modulation time slot
Just can effectively solve " off " light modulation time slot in traditional scheme and not transmit the awkward situation of any signal, and avoid signal to synchronize and postpone
Etc. problem, reduce system complexity.
The ofdm signal of this utility model device transmitting terminal and receiving terminal concrete waveform diagram as in figure 2 it is shown, this
In assume that accurate dimming duty cycle is 55.5%, the most every 9 light modulation time slots in have 5 for " on " dim time slot.At transmitting terminal, letter
After the binary bit stream that source sends enters described OFDM manipulator, it is modulated into bipolarity ofdm signal.When " on " dims
Gap, ofdm signal f (t) is only modulated described commercial visible LED lighting source by described visible LED driver, therefore is launched
Luminous power is Pa* (1+Ma*f (t))；Dimming time slot at " off ", ofdm signal is only modulated institute by described infrared LED driver
State commercial visible LED lighting source, therefore launching luminous power is Pb* (1+Mb*f (t)).Meanwhile, " on " light modulation time slot and
The ofdm signal waveform of " off " light modulation slot transmission is continuous, and speed is identical.It addition, described commercial visible LED lighting source and
It is notable that described low-power infrared LED compensatory light launches light-intensity difference, it can be ensured that health also meets illumination and signal demodulation
Needs, described low-power infrared LED compensatory light launch light intensity meet international standard International
IEC60825-1 and the American National Standards that Electrotechnical Commission (IEC) specifies
The ANSI Z136.1 that Institute (ANSI) specifies.
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 this utility model, even
" on " and " off " light modulation time slot continued all has waveform continuous print ofdm signal to be transmitted, and so can be prevented effectively from prolonging of transmission
Slow problem.It should also be noted that ambipolar ofdm signal is carried on visible ray dimmer pulse, do not change visible ray
The average emitted luminous power of LED, thus the accuracy of light modulation is had no effect by OFDM transmission.
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, this utility model device is adopted under different dimming duty cycle
The order of modulation of OFDM sub-carrier as it is shown on figure 3, the most only illustrate as a example by MQAM and illustrate.It can be seen that
The order of modulation of OFDM sub-carrier constant can remain 4 under different dimming duty cycle, and this will be greatly simplified communication system
The design of system circuit.
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 this utility model is pointed out,
It is arranged on indoor, it is possible to make interior lighting system carry out the normal transmission of ofdm signal, structure letter while gamut dims
Single, stable signal transmission, the injury to human body is negligible.
The foregoing is only embodiment of the present utility model, not thereby limit the scope of the claims of the present utility model, every
Utilize equivalent structure or equivalence flow process conversion that this utility model description made, or be directly or indirectly used in other phase
The technical field closed, is the most in like manner included in scope of patent protection of the present utility model.
Claims (7)
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 4 light modulation, it is characterised in that institute
Normalization OFDM waveform f (t) stating the output of normalized device is input to described ofdm signal demodulator, described ofdm signal solution
Adjust device directly f (t) to be demodulated, and demodulation result is exported the stay of two nights.
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| CN105846896A (en) * | 2016-05-16 | 2016-08-10 | 苏州安莱光电科技有限公司 | Visible light OFDM communication device for infrared compensation total range light modulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846896A (en) * | 2016-05-16 | 2016-08-10 | 苏州安莱光电科技有限公司 | Visible light OFDM communication device for infrared compensation total range light modulation |
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