CN105049118B - Visible light communication method and its visible light communication system based on dual modulation technology - Google Patents
Visible light communication method and its visible light communication system based on dual modulation technology Download PDFInfo
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- CN105049118B CN105049118B CN201510515037.2A CN201510515037A CN105049118B CN 105049118 B CN105049118 B CN 105049118B CN 201510515037 A CN201510515037 A CN 201510515037A CN 105049118 B CN105049118 B CN 105049118B
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Abstract
The invention discloses a kind of visible light communication method based on dual modulation technology, comprise the following steps：1st, the vision signal that information source is sent is converted to n bit binary number signals by the first programmable gate array；2nd, every group of described n bit binary number signal is converted to n by the first programmable gate array2Binary digits signal；3rd, the first programmable gate array is by described n2Level pulse-amplitude modulation and pulse width modulation are superimposed, form n2+ k grades of light intensity changes；4th, receiving subsystem restores primary signal；The invention also discloses a kind of visible light communication system for realizing the visible light communication method based on dual modulation technology, including：Launch subsystem, transmission subsystem and receiving subsystem.Having the advantages that can be respectively from illumination and the light source of orientation optimization visible light communication system communicated and wide application prospect.
Description
Technical field
The present invention relates to visible light communication technology, more particularly to a kind of visible light communication method based on dual modulation technology
And its visible light communication system, the present invention be a kind of pulse-amplitude modulation technology with pulse width light regulating technology be combined it is dual
Modulation technique and the method for realizing data transmit-receive.
Background technology
In recent years, the semiconductor illumination technique for being described as " green illumination " is developed rapidly.Illuminated with traditional incandescent lamp etc.
Light source is compared, and LED has the advantages that low-power consumption, long lifespan, size be small, environmental protection.At the same time, LED has more modularity
Can the advantage such as good, response sensitivity is high.Signal is loaded on LED with the high frequency of human eye None- identified and is transmitted, and then is urged
Illumination and technology --- the visible light communication of communicating integral can be realized by bearing one.
Compared with traditional infrared and radio communication, it is seen that optic communication has transmission power height, without electromagnetic interference, without Shen
Please frequency spectrum resource and information confidentiality the advantages of.However, the problem of still suffering from many in visible light communication, wherein maximum
One of challenge be the limited modulation bandwidths of LED.General fluorescent material LED modulation bandwidths only have several megahertzs, it is seen that optic communication
System data transmission rate is restricted.For promoting transmission rate, except being opened up from LED structure, the design of drive circuit
Open up bandwidth；System overall bandwidth can also be improved by different modulation systems.But but substantially increase visible ray and lead to
The complexity of letter system.And the phenomenon for being limited only to communicate and ignore illumination is studied for current visible light communication, with reference to arteries and veins
Rush the dimming arrangement of width modulation technology to regulate and control the light source of visible light communication system, light fixture is maintained certain luminous flux water
The flat illumination to be suitable for interior.
The content of the invention
In order to overcome the disadvantages mentioned above and deficiency of prior art, primary and foremost purpose of the invention is to propose one kind based on dual
The visible light communication method of modulation technique, this method respectively from illumination with the orientation optimization that communicates the light of visible light communication system
Source.
In order to overcome the disadvantages mentioned above and deficiency of prior art, another object of the present invention is to propose that a kind of realize is based on
The visible light communication system of the visible light communication method of dual modulation technology, the system is based on simple baseband modulation technique and proposes to make
Dual modulation technology is realized with the LED array of one 4 × 4, under the premise of bandwidth of a device is not increased, radio communication is significantly improved
Quality and message transmission rate, while can combine pulse width modulating technology realizes light modulation.
The primary and foremost purpose of the present invention is achieved through the following technical solutions：A kind of visible light communication based on dual modulation technology
Method, comprises the following steps：
The vision signal that information source is sent is converted to n bit binary number signals by step 1, the first programmable gate array；
Every group of described n bit binary number signal is converted to n by step 2, the first programmable gate array2Binary digits are believed
Number, wherein, n is positive integer, the n2Binary digits signal correspondence n2The state of kind, every kind of bright respective number of state corresponding points
LED, different number of LED chip, which is lighted, can realize the change of luminous flux, the COB encapsulation LED lamp is had n2Level light
Strong change, the n2The change of level light intensity is n2Level pulse-amplitude modulation；
Step 3, the first programmable gate array are by described n2Level pulse-amplitude modulation and pulse width modulation are superimposed, shape
Into n2+ k grades of light intensity changes, wherein, k is positive integer；
Step 4, receiving subsystem sense n by photoelectricity testing part2+ k grades of light intensity changes, generate n2+ k grades of pulse telecommunications
Number, after the signal demodulation process of receiving subsystem, restore primary signal.
The step 1 comprises the following steps：
The red, green and blue component difference for every frame video signal that step 11, the first programmable gate array are sent to information source
Digital-to-analogue conversion quantification treatment is carried out, raw pixel digital signal is formed；
Raw pixel digital signal is converted into 8 bit binary number signals by step 12, the first programmable gate array, and is pressed
Order is arranged, and one group of binary digital signal is divided into every n, LED drive circuit is output to.
In step 4, the method for the signal demodulation process comprises the following steps：
Step 41, pre-amplification circuit are with rearmounted amplifying circuit to received n2+ k grades of pulse electrical signals are amplified
Processing and filtering process；
Step 42, the n to passing through enhanced processing and filtering process2+ k grades of pulse electrical signals entered ADC digital analog converters and entered
Row analog-to-digital conversion, generates n2+ k binary digits signals, the second programmable gate array is n2+ k binary digits signal carries out filtering out pulse
Width modulation circuit, that is, filter out k and obtain n2Binary digits signal, second programs gate array by described n2Binary digits signal
Be converted to n bit binary number signals；
Step 43, the second programmable gate array are sequentially arranged the n bit binary numbers signal, every 8
One group of 8 bit binary number signal is merged into, the second programmable gate array is converted to the 8 bit binary number signal original
Pixel digital signals；
The raw pixel digital signals revivification is per frame video signal by step 44, the second programmable gate array.
Another object of the present invention is achieved through the following technical solutions：It is a kind of realize described in based on dual modulation technology
The visible light communication system of visible light communication method, including：Launch subsystem, transmission subsystem and receiving subsystem, the hair
Penetrating subsystem has：First programmable gate array, LED drive circuit and COB encapsulation LED lamps, the receiving subsystem have：
Photoelectricity testing part, ADC analog-digital converters and the second programmable gate array；The transmission subsystem is used to COB encapsulate LED
Have the visible light signal sent and be transferred to photoelectricity testing part；First programmable gate array, LED drive circuit, COB encapsulation
LED lamp, photoelectricity testing part, ADC analog-digital converters and the second programmable gate array are sequentially connected；First programmable gate
Array exports n bit binary number signals, and the n bit binary number signals of output are transferred to LED drive circuit, the n
Bit binary number signal driving COB encapsulation LED lamps carry out n2Level light intensity modulation, the COB encapsulation LED lamp transmitting can
Optical signal is seen to photoelectricity testing part, and visible light signal is converted into analog signal, the ADC digital-to-analogues by the photoelectricity testing part
The analog signal that photoelectricity testing part is exported is sampled into n bit binary number signals by converter, the ADC digital analog converters
The n bit binary number signals sampled are transferred to the second programmable gate array.
The COB encapsulation LED lamp includes LED chip and corresponding LED drive circuit, and every piece of LED chip is by corresponding
LED drive circuit carrys out independent control；The LED drive circuit includes：Information source, variable resistor, high-speed buffer, Bias Tee moulds
Block, DC current source and current-limiting resistance, described information source, variable resistor, high-speed buffer, Bias Tee modules and current-limiting resistance
It is sequentially connected；Positive pole and the information source connection of the DC current source, the negative pole and Bias Tee modules of the DC current source connect
Connect；Described Bias Tee modules include electric capacity and inductance；One end of the inductance and the negative pole of DC current source are connected, described
The other end of inductance and the negative pole of electric capacity are connected, and the positive pole of the electric capacity is connected with high-speed buffer；The electricity of the information source output
Signal is transferred to Bias Tee modules by high-speed buffer, and the DC signal that the DC current source is exported is with delaying at a high speed
Rush the signal that device transmitted to be coupled in Bias Tee modules, generate coupled electrical signal；The coupled electrical signal passes through limit
Leakage resistance is exported.
The LED array that the COB encapsulation LED lamp is n × n, every piece of LED chip individual packages.
The transmitting subsystem also includes：First liquid crystal display and video camera, the receiving subsystem also include preposition
Amplifying circuit, rearmounted amplifying circuit and the second liquid crystal display；The first described liquid crystal display and video camera can with first
Gate array connection is programmed, photoelectricity testing part is connected by pre-amplification circuit and rearmounted amplifying circuit with ADC digital analog converters,
Second programmable gate array and the connection of the second liquid crystal display；Video signal transmission is given the first programmable gate by described video camera
Array；First programmable gate array gives the first liquid crystal display video signal transmission；The photoelectricity testing part is mould
Intend signal and processing is amplified by pre-amplification circuit；The analog signal after amplification is filtered by rearmounted amplifying circuit
Ripple processing is transmitted further to ADC analog-digital converters；Second programmable gate array gives the second liquid crystal display video signal transmission
Device.
The transmitting subsystem enters data into COB by LED drive circuit and encapsulated in LED lamp, sends visible ray, leads to
Cross transmission subsystem effectively to be transmitted optical signal, finally by receiving subsystem the change of sensing light intensity and data
Communication is realized in conversion.The transmitting subsystem includes video camera, the first programmable gate array, the first liquid crystal display, LED drivings
Circuit and COB encapsulation LED lamps, the LED drive circuit have the electricity components such as electric capacity and inductance, and the COB encapsulates LED
Tool can be encapsulated on pcb board by 16 pieces of LED chips by COB encapsulation technologies.The transmission subsystem is free space.It is described
Receiving subsystem includes photoelectric detector, pre-amplification circuit, rearmounted amplifying circuit, ADC analog-digital converters, the second programmable gate
Array and the second liquid crystal display.
The principle of the present invention：The present invention be applied to visible light communication dual modulation technology, including pulse-amplitude modulation with
Pulse width modulation；The pulse-amplitude modulation technology be based on simple baseband modulation technique, using 4 × 4 LED array as
The information source of visible light communication system, can by controlling the pulse amplitude lighted and then realize 16 grades of different number LEDs to regulate and control
To transmit the binary code of 4 within a clock cycle, relative to the visible light communication of traditional use OOK modulation techniques
System, can improve 4 times by message transmission rate.The pulse width width modulation technology is existed frequently with covering human eye vision and dodging
It is switched fast between zero current and maximum current, LED array is controlled by changing the size of average current to Duty ratio control
Luminous flux.The modulation technique not only under the premise of bandwidth of a device is not increased, significantly improves the quality and speed of communication, and combines
Dimming arrangement regulates and controls light-source system, makes the light source maintain certain luminous flux level to be suitable for the illumination and communication of interior；
Optimize the light source of visible light communication system with the angle communicated from illumination respectively, therefore, the present invention has before wide application
Scape.
Compared with prior art, the present invention has advantages below and beneficial effect：
1st, the present invention is based on simple baseband modulation technique, compared with traditional use orthogonal frequency division multiplexing modulation, discrete many
Sound modulation technique etc., enormously simplify the complexity of system, and on the premise of LED component bandwidth can not be increased, exponentially
Improve the quality of radio communication and the capacity of channel.
2nd, the present invention has used pulse width light modulation to be applied according to the luminous flux of the demand modeling LED lamp of illumination
In different occasions, the different indoor environment of such as area, to reach the room lighting of higher quality, light regulating technology is incorporated into
In VLC systems.
3rd, by the present invention in that with the LED array of one 4 × 4, realizing 16 grades of pulse amplitude (PAM) modulation.Compared with biography
The visible light communication system that the use OOK modulation techniques of system regulate and control, can lift 4 times by system data transmission rate
4th, by the present invention in that realizing dual modulation with light-intensity test, it will not produce what traditional MIMO modulation was brought
The problems such as intersymbol interference.Improve channel stability.
Brief description of the drawings
Fig. 1 realizes the schematic diagram of pulse modulated visible light communication system for the present invention.
Fig. 2 a are 4 × 4 LED array of the invention.
Fig. 2 b are the schematic diagram of LED drive circuit.
Fig. 3 realizes the data conversion schematic diagram of 16 grades of pulse-amplitude modulations for the present invention.
Fig. 4 present invention realize the system data transition diagram of dual modulation technology.
Fig. 5 realizes the data conversion schematic diagram of 16 grades of pulse-amplitude modulations for the present invention.
Fig. 6 realizes the schematic diagram that PAM is superimposed with PWM for the present invention.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As shown in figure 1, a kind of visible light communication system based on pulse-amplitude modulation, including：Launch subsystem, transmission
System, receiving subsystem.Described transmitting subsystem, video camera receives real time video signals and passed by the first programmable gate array
It is defeated to the first liquid crystal display, show raw video signal, and through ovennodulation and corresponding video signal processing technology, be transferred to
In LED drive circuit, the coupling of direct current signal and AC signal is realized by electric capacity and inductance so as to ensure that signal in the led
It will not lose, Fig. 2 a and Fig. 2 b are the schematic diagram that COB encapsulates LED lamp and LED drive circuit；The LED lamp is one 4 × 4
LED array, 16 pieces of chips are encapsulated in PCB by COB encapsulation technologies.
As shown in figure 3, reading in after video data, a width RGB image can be seen as per frame video, its each pixel is by 256 ranks
The colouring component of red, green, blue three is constituted.Therefore the red, green, blue component of image is respectively processed, raw pixel data, 0-
255, decimal number is represented.It is converted into binary data of 8, and is divided into two groups of 4 binary data and in order
Arrange, be converted into hexadecimal data, 0-15.As shown in figure 4, the signal of PAM modulation is combined with pwm signal again, finally
Signal after combination is passed in drive circuit, LED array is driven.Represented respectively as shown in figure 5, providing 4 various amplitude ranks
Information.For example " 1010 " represent the 10th grade of amplitude, and " 1010 " this 4 binary system generations are represented by lighting 10 pieces of LED chips
Code.As shown in 4 × 4 grids below reference axis, wherein to represent LED bright for 10 black box, and 6 white boxes are then represented
Go out.Similarly, " 1100 ", " 0100 " and " 0111 " represent the 12nd grade, the 4th grade and the 7th grade respectively；As shown in fig. 6, being pulse amplitude
Modulation is superimposed schematic diagram with pulse width modulation.After optical signal is by transmission subsystem, telecommunications is converted to through photoelectric detector
Number, enhanced processing is filtered by pre-amplification circuit and rearmounted amplifying circuit, then electric signal is carried out by ADC analog-digital converters
Quantization is converted to data signal.Then PAM is demodulated with PWM.Converted a signal into and regarded by the second programmable gate array again
Frequency signal, then pass in the second liquid crystal display.Compared by the first liquid crystal display with signal in the second liquid crystal display, can
The bit error rate of system is tested out, the operation for verifying system.
Above-described embodiment is only one embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other it is any without departing from Spirit Essences and the change made under principle of the present invention, modification, replacements, combine, simplification
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (7)
1. a kind of visible light communication method based on dual modulation technology, it is characterised in that comprise the following steps：
The vision signal that information source is sent is converted to n bit binary number signals by step 1, the first programmable gate array；
Every group of n bit binary number signal is converted to n by step 2, the first programmable gate array2Binary digits signal, wherein, n is
Positive integer, the n2Binary digits signal correspondence n2The state of kind, the LED of every kind of bright respective number of state corresponding points is different number of
LED chip, which is lighted, can realize the change of luminous flux, and COB is encapsulated LED lamp has n2The change of level light intensity, the n2Level light
Strong change is n2Level pulse-amplitude modulation；
Step 3, the first programmable gate array are by described n2Level pulse-amplitude modulation and pulse width modulation are superimposed, form n2+
K grades of light intensity changes, wherein, k is positive integer；
Step 4, receiving subsystem sense n by photoelectricity testing part2+ k grades of light intensity changes, generate n2+ k grades of pulse electrical signals, warp
After the signal demodulation process for crossing receiving subsystem, primary signal is restored.
2. the visible light communication method according to claim 1 based on dual modulation technology, it is characterised in that the step
1 comprises the following steps：
The red, green and blue component for every frame video signal that step 11, the first programmable gate array are sent to information source is carried out respectively
Digital-to-analogue conversion quantification treatment, forms raw pixel digital signal；
Raw pixel digital signal is converted into 8 bit binary number signals by step 12, the first programmable gate array, and in order
Arrangement, one group of binary digital signal is divided into every n, LED drive circuit is output to.
3. the visible light communication method according to claim 1 based on dual modulation technology, it is characterised in that in step 4
In, the method for the signal demodulation process comprises the following steps：
Step 41, pre-amplification circuit are with rearmounted amplifying circuit to received n2+ k grades of pulse electrical signals are amplified processing
And filtering process；
Step 42, the n to passing through enhanced processing and filtering process2+ k grades of pulse electrical signals entered ADC digital analog converters and carry out modulus
Conversion, generates n2+ k binary digits signals, the second programmable gate array is n2+ k binary digits signal carries out filtering out pulse width tune
Part processed, that is, filter out k and obtain n2Binary digits signal, second programs gate array by described n2Binary digits signal is converted to n
Bit binary number signal；
Step 43, the second programmable gate array are sequentially arranged the n bit binary numbers signal, every 8 merging
For one group of 8 bit binary number signal, the 8 bit binary number signal is converted to original pixels by the second programmable gate array
Data signal；
The raw pixel digital signals revivification is per frame video signal by step 44, the second programmable gate array.
4. a kind of visible light communication system for the visible light communication method based on dual modulation technology realized described in claim 1
System, including：Launch subsystem, transmission subsystem and receiving subsystem, it is characterised in that the transmitting subsystem has：First
Programmable gate array, LED drive circuit and COB encapsulation LED lamps, the receiving subsystem have：Photoelectricity testing part, ADC
Analog-digital converter and the second programmable gate array；The transmission subsystem is used to COB encapsulate the visible ray letter that LED lamp is sent
Number it is transferred to photoelectricity testing part；First programmable gate array, LED drive circuit, COB encapsulation LED lamp, Photoelectric Detection
Device, ADC analog-digital converters and the second programmable gate array are sequentially connected；The first programmable gate array output n positions two are entered
Data signal processed, and the n bit binary number signals of output are transferred to LED drive circuit, the n bit binary numbers signal
COB encapsulation LED lamps are driven to carry out n2Level light intensity modulation, the COB encapsulation LED lamp transmitting visible light signal is examined to photoelectricity
Device is surveyed, visible light signal is converted into analog signal by the photoelectricity testing part, and the ADC digital analog converters are Photoelectric Detection
The analog signal of device output samples into n bit binary number signals, and the n positions two that the ADC digital analog converters are sampled are entered
Digital data transmission processed gives the second programmable gate array.
5. the visible light communication system of the visible light communication method according to claim 4 based on dual modulation technology, its
It is characterised by, the COB encapsulation LED lamp includes LED chip and corresponding LED drive circuit, and every piece of LED chip is by corresponding
LED drive circuit carrys out independent control；The LED drive circuit includes：Information source, variable resistor, high-speed buffer, Bias Tee moulds
Block, DC current source and current-limiting resistance, described information source, variable resistor, high-speed buffer, Bias Tee modules and current-limiting resistance
It is sequentially connected；Positive pole and the information source connection of the DC current source, the negative pole and Bias Tee modules of the DC current source connect
Connect；Described Bias Tee modules include electric capacity and inductance；One end of the inductance and the negative pole of DC current source are connected, described
The other end of inductance and the negative pole of electric capacity are connected, and the positive pole of the electric capacity is connected with high-speed buffer；The electricity of the information source output
Signal is transferred to Bias Tee modules by high-speed buffer, and the DC signal that the DC current source is exported is with delaying at a high speed
Rush the signal that device transmitted to be coupled in Bias Tee modules, generate coupled electrical signal；The coupled electrical signal passes through limit
Leakage resistance is exported.
6. the visible light communication system of the visible light communication method according to claim 4 based on dual modulation technology, its
It is characterised by, the LED array that the COB encapsulation LED lamp is n × n, every piece of LED chip individual packages.
7. the visible light communication system of the visible light communication method according to claim 4 based on dual modulation technology, its
It is characterised by, the transmitting subsystem also includes：First liquid crystal display and video camera, the receiving subsystem also include preposition
Amplifying circuit, rearmounted amplifying circuit and the second liquid crystal display；The first described liquid crystal display and video camera can with first
Gate array connection is programmed, photoelectricity testing part is connected by pre-amplification circuit and rearmounted amplifying circuit with ADC digital analog converters,
Second programmable gate array and the connection of the second liquid crystal display；Video signal transmission is given the first programmable gate by described video camera
Array；First programmable gate array gives the first liquid crystal display video signal transmission；The photoelectricity testing part is mould
Intend signal and processing is amplified by pre-amplification circuit；The analog signal after amplification is filtered by rearmounted amplifying circuit
Ripple processing is transmitted further to ADC analog-digital converters；Second programmable gate array gives the second liquid crystal display video signal transmission
Device.
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| CN105719166A (en) * | 2016-03-28 | 2016-06-29 | 华南理工大学 | Shopping guide method based on Zigbee communication and visible light communication and system achieving method |
| CN110268643B (en) * | 2017-02-09 | 2022-01-11 | 富士通株式会社 | Transmission device, transmission control device, communication system, transmission method, and recording medium |
| CN107135570B (en) * | 2017-04-18 | 2019-08-13 | 中国科学院半导体研究所 | The adjustable visible light communication LED light source of modulation bandwidth |
| CN107395286A (en) * | 2017-07-20 | 2017-11-24 | 华南理工大学 | Optical communication system and modulator approach based on CDMA Yu CSK dual modulations |
| CN107682080A (en) * | 2017-08-12 | 2018-02-09 | 华南理工大学 | It is logical according to integrated visible light communication system based on artificial neuron's balanced device |
| CN107611155B (en) * | 2017-08-30 | 2023-09-26 | 华南理工大学 | GaN-based micron-sized LED array chip shared by illumination display communication and integrated module |
| CN108092717B (en) * | 2017-12-26 | 2019-11-29 | 东莞信大融合创新研究院 | A kind of multicolor visible light communication illumination and transceiver combined optimization technology |
| CN108631868A (en) * | 2018-03-07 | 2018-10-09 | 华南理工大学 | A kind of dynamic testing method and its system for dynamic visible light communication |
| WO2020198917A1 (en) | 2019-03-29 | 2020-10-08 | 京东方科技集团股份有限公司 | Optical communication driving circuit and method, optical communication sending terminal, system and vehicle |
| CN112865864B (en) * | 2020-12-31 | 2022-03-15 | 华南师范大学 | Transmitting signal simulation method and signal simulator of visible light communication system |
| CN114578744B (en) * | 2022-05-07 | 2022-07-29 | 武汉筑链智能科技有限公司 | Method and device for acquiring equipment operation data |
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