CN105049118A - Visible light communication method based on double-modulation technology and visible light communication system thereof - Google Patents
Visible light communication method based on double-modulation technology and visible light communication system thereof Download PDFInfo
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- CN105049118A CN105049118A CN201510515037.2A CN201510515037A CN105049118A CN 105049118 A CN105049118 A CN 105049118A CN 201510515037 A CN201510515037 A CN 201510515037A CN 105049118 A CN105049118 A CN 105049118A
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Abstract
The invention discloses a visible light communication method based on a double-modulation technology. The visible light communication method comprises the following steps that: (1), a first programmable gate array converts video signals sent by a signal source into n-bit binary digital signals; (2), the first programmable gate array converts each set of n-bit binary digital signals into n binary digital signals; (3), the first programmable gate array superposes n2-stage pulse amplitude modulation with pulse width modulation so as to form n2+k-stage light intensity change; and (4), a receiving sub-system reduces original signals. The invention further discloses a visible light communication system of the visible light communication method based on the double-modulation technology. The visible light communication system comprises a transmitting sub-system, a transmission sub-system and the receiving sub-system. The visible light communication system has the advantages that: a light source of the visible light communication system can be optimized in terms of illumination and communication; the application prospect is wide, etc.
Description
Technical field
The present invention relates to visible light communication technology, in particular to a kind of visible light communication method based on dual modulation technology and visible light communication system thereof, the present invention is the dual modulation technology that a kind of pulse-amplitude modulation technology combines with pulse duration light regulating technology and the method realizing data transmit-receive.
Background technology
In recent years, the semiconductor illumination technique being described as " green illumination " develops rapidly.Compared with the lighting sources such as traditional incandescent lamp, the advantages such as LED has low-power consumption, the life-span is long, size is little, environmental protection.Meanwhile, LED has more the advantages such as modulating performance is good, response sensitivity is high.Signal is loaded on LED with the high frequency of human eye None-identified and transmits, and then expedite the emergence of out technology---the visible light communication that can realize illumination and communicating integral.
Infraredly to compare with radio communication with traditional, visible light communication have transmitting power high, without electromagnetic interference, without the need to applying for the advantages such as the confidentiality of frequency spectrum resource and information.But be still faced with many problems in visible light communication, one of wherein maximum challenge is the limited modulation bandwidth of LED.General fluorescent material LED modulation bandwidth only has a few megahertz, and visible light communication system message transmission rate is restricted.In order to promoting transmission rate, except expanding bandwidth from the design of the structure of LED, drive circuit; Entire system bandwidth can also be improved by different modulation systems.But but substantially increase the complexity of visible light communication system.And be only confined to communicate for current visible light communication research and ignore the phenomenon of illumination, the dimming arrangement in conjunction with pulse width modulating technology regulates and controls the light source of visible light communication system, makes light fixture maintain certain luminous flux level to be suitable for indoor illumination.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art with not enough, primary and foremost purpose of the present invention is to propose a kind of visible light communication method based on dual modulation technology, and the method is respectively from the light source of visible light communication system that thrown light on the orientation optimization communicated.
In order to overcome the above-mentioned shortcoming of prior art with not enough, another object of the present invention is to propose a kind of visible light communication system realizing visible light communication method based on dual modulation technology, the LED array that this system proposes use one 4 × 4 based on simple baseband modulation technique realizes dual modulation technology, do not increasing under bandwidth of a device prerequisite, significantly improve quality and the message transmission rate of radio communication, light modulation can be realized in conjunction with pulse width modulating technology simultaneously.
Primary and foremost purpose of the present invention is achieved through the following technical solutions: a kind of visible light communication method based on dual modulation technology, comprises the following steps:
The vision signal that information source sends by step 1, the first programmable gate array is converted to n bit binary number signal;
Described often group n bit binary number signal is converted to n by step 2, the first programmable gate array
2binary digits signal, wherein, n is positive integer, described n
2the corresponding n of binary digits signal
2the state of kind, the LED of often kind of bright respective number of state corresponding points, the LED chip of different number lights the change that can realize luminous flux, makes described COB packaged LED light fixture have n
2the change of level light intensity, described n
2the change of level light intensity and n
2level pulse-amplitude modulation;
Step 3, the first programmable gate array are by described n
2level pulse-amplitude modulation and pulse width modulation is superimposed, formation n
2+ k level light intensity changes, and wherein, k is positive integer;
Step 4, receiving subsystem respond to n by photoelectricity testing part
2+ k level light intensity changes, and generates n
2+ k level pulse electrical signal, after the signal receiving process of receiving subsystem, restores primary signal.
Described step 1 comprises the following steps:
Step 11, the first programmable gate array red, green and blue component to every frame video signal that information source sends carries out digital-to-analogue conversion quantification treatment respectively, forms raw pixel digital signal;
Step 12, the first programmable gate array convert 8 bit binary number signals to raw pixel digital signal, and arrange in order, be divided into one group of binary digital signal, output to LED drive circuit every n position.
In step 4, the method for described signal receiving process comprises the following steps:
Step 41, pre-amplification circuit and rearmounted amplifying circuit are to received n
2+ k level pulse electrical signal carries out amplification process and filtering process;
Step 42, to through amplifying process and the n of filtering process
2+ k level pulse electrical signal entered ADC digital to analog converter and carried out analog-to-digital conversion, generated n
2+ k binary digits signal, the second programmable gate array is n
2+ k binary digits signal carries out filtering pulse width modulation part, i.e. filtering k and obtain n
2binary digits signal, the second programming gate array is by described n
2binary digits signal is converted to n bit binary number signal;
Step 43, the second programmable gate array arrange sequentially to described n bit binary number signal, merge into one group of 8 bit binary number signal every 8, the second programmable gate array is converted to raw pixel digital signal described 8 bit binary number signals;
Described raw pixel digital signals revivification is every frame video signal by step 44, the second programmable gate array.
Another object of the present invention is achieved through the following technical solutions: a kind of visible light communication system realizing the described visible light communication method based on dual modulation technology, comprise: launch subsystem, transmission subsystem and receiving subsystem, described transmitting subsystem has: the first programmable gate array, LED drive circuit and COB packaged LED light fixture, and described receiving subsystem has: photoelectricity testing part, ADC analog to digital converter and the second programmable gate array; Described transmission subsystem is used for the visible light signal that COB packaged LED light fixture sends to be transferred to photoelectricity testing part; Described first programmable gate array, LED drive circuit, COB packaged LED light fixture, photoelectricity testing part, ADC analog to digital converter are connected successively with the second programmable gate array; Described first programmable gate array exports n bit binary number signal, and the n bit binary number Signal transmissions exported to LED drive circuit, described n bit binary number signal drives COB packaged LED light fixture to carry out n
2level light intensity modulation, described COB packaged LED light fixture launches visible light signal to photoelectricity testing part, described photoelectricity testing part converts analog signal to visible light signal, described ADC digital to analog converter samples into n bit binary number signal the analog signal that photoelectricity testing part exports, and the n bit binary number Signal transmissions that described ADC digital to analog converter is sampled gives the second programmable gate array.
Described COB packaged LED light fixture comprises LED chip and corresponding LED drive circuit, and every block LED chip is independently controlled by corresponding LED drive circuit; Described LED drive circuit comprises: information source, variable resistor, high-speed buffer, BiasTee module, DC current source and current-limiting resistance, and described information source, variable resistor, high-speed buffer, BiasTee module are connected successively with current-limiting resistance; The positive pole of described DC current source is connected with information source, the negative pole of described DC current source and BiasTee model calling; Described BiasTee module comprises electric capacity and inductance; One end of described inductance is connected with the negative pole of DC current source, and the other end of described inductance is connected with the negative pole of electric capacity, and the positive pole of described electric capacity is connected with high-speed buffer; The signal of telecommunication that described information source exports is transferred to BiasTee module through high-speed buffer, and the signal that the DC signal that described DC current source exports and high-speed buffer transmit is coupled in BiasTee module, generates coupled electrical signal; Described coupled electrical signal is exported by current-limiting resistance.
Described COB packaged LED light fixture is the LED array of n × n, every block LED chip individual packages.
Described transmitting subsystem also comprises: the first liquid crystal display and video camera, and described receiving subsystem also comprises pre-amplification circuit, rearmounted amplifying circuit and the second liquid crystal display; The first described liquid crystal display is all connected with the first programmable gate array with video camera, and photoelectricity testing part is connected with ADC digital to analog converter with rearmounted amplifying circuit by pre-amplification circuit, and the second programmable gate array is connected with the second liquid crystal display; Video signal transmission is given the first programmable gate array by described video camera; Described first programmable gate array gives the first liquid crystal display video signal transmission; Described photoelectricity testing part carries out amplification process analog signal by pre-amplification circuit; Described analog signal after amplification is carried out filtering process through rearmounted amplifying circuit and is transferred to ADC analog to digital converter again; Described second programmable gate array gives the second liquid crystal display video signal transmission.
Data input in COB packaged LED light fixture by LED drive circuit by described transmitting subsystem, send visible ray, by transmission subsystem, light signal is transmitted effectively, finally by receiving subsystem, the induction change of light intensity is realized communicating with the conversion of data.Described transmitting subsystem comprises video camera, the first programmable gate array, the first liquid crystal display, LED drive circuit and COB packaged LED light fixture, described LED drive circuit has the electricity component such as electric capacity and inductance, and described COB packaged LED light fixture can be encapsulated on pcb board by COB encapsulation technology by 16 pieces of LED chips.Described transmission subsystem is free space.Described receiving subsystem comprises photoelectric detector, pre-amplification circuit, rearmounted amplifying circuit, ADC analog to digital converter, the second programmable gate array and the second liquid crystal display.
Principle of the present invention: the present invention is applicable to the dual modulation technology of visible light communication, comprises pulse-amplitude modulation and pulse width modulation; Described pulse-amplitude modulation technology is based on simple baseband modulation technique, use the LED array of 4 × 4 as the information source of visible light communication system, by controlling the pulse amplitude regulation and control lighting and then realize 16 grades of different number LED, the binary code of 4 can be transmitted within a clock cycle, relative to the visible light communication system of traditional use OOK modulation technique, message transmission rate can be improved 4 times.Described pulse duration width modulation technology covers human eye vision sudden strain of a muscle frequently to switch fast between zero current and maximum current, controlled the luminous flux of LED array by size Duty ratio control being changed to average current.This modulation technique is not only increasing under bandwidth of a device prerequisite, significantly improves quality and the speed of communication, and regulates and controls light-source system in conjunction with dimming arrangement, makes light source maintain certain luminous flux level to be suitable for indoor illumination and communication; Respectively from throwing light on the angle communicated to optimize the light source of visible light communication system, therefore, the present invention has broad application prospects.
Compared with prior art, the present invention has the following advantages and beneficial effect:
1, the present invention is based on simple baseband modulation technique, compared with the traditional multiplexing modulation of use orthogonal frequency division, discrete multitone techniques etc., enormously simplify the complexity of system, and under the prerequisite of LED component bandwidth can not be increased, improve the quality of radio communication and the capacity of channel exponentially.
2, the present invention has used pulse duration light modulation can according to the luminous flux of demand modeling LED lamp of illumination to be applied to different occasions, and indoor environments as different in area, to reach the room lighting of more high-quality, is incorporated into light regulating technology in VLC system.
3, the present invention is by the LED array of use one 4 × 4, realizes pulse amplitude (PAM) modulation of 16 grades.Compared with the visible light communication system of traditional use OOK modulation technique regulation and control, system data transmission rate can be promoted 4 times
4, the present invention realizes dual modulation by using light-intensity test, can not produce traditional MIMO and modulate the problems such as the intersymbol interference brought.Improve channel stability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the present invention realizes pulse modulated visible light communication system.
Fig. 2 a is the LED array of of the present invention 4 × 4.
Fig. 2 b is the schematic diagram of LED drive circuit.
Fig. 3 is the data transaction schematic diagram that the present invention realizes 16 grades of pulse-amplitude modulation.
The present invention of Fig. 4 position realizes the system data transition diagram of dual modulation technology.
Fig. 5 is the data transaction schematic diagram that the present invention realizes 16 grades of pulse-amplitude modulation.
Fig. 6 is the schematic diagram that the present invention realizes PAM and PWM superposition.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, a kind of visible light communication system based on pulse-amplitude modulation, comprising: launch subsystem, transmission subsystem, receiving subsystem.Described transmitting subsystem, video camera receives real time video signals and is transferred to the first liquid crystal display by the first programmable gate array, display raw video signal, and through ovennodulation and corresponding video signal processing technology, be transferred in LED drive circuit, realize being coupled thus ensure that signal can not be lost in the led of direct current signal and AC signal by electric capacity and inductance, Fig. 2 a and Fig. 2 b is the schematic diagram of COB packaged LED light fixture and LED drive circuit; This LED lamp is the LED array of 4 × 4, and 16 chip blocks are encapsulated in PCB by COB encapsulation technology.
As shown in Figure 3, after reading in video data, every frame video can be seen as a width RGB image, and its each pixel is made up of red, green, blue three colouring component on 256 rank.Therefore process respectively the red, green, blue component of image, raw pixel data, 0-255, decimal number represents.Convert binary data of 8 to, and be divided into two groups of 4 binary data and arrange in order, convert hexadecimal data to, 0-15.As shown in Figure 4, the signal of PAM modulation combines with pwm signal again, finally passes in drive circuit by the signal after combination, driving LED array.As shown in Figure 5, the information that 4 various amplitude ranks represent respectively is provided.Such as " 1010 " represent the 10th grade of amplitude, namely represent " 1010 " these 4 binary codes by lighting 10 pieces of LED chips.As shown in 4 × 4 grids below reference axis, wherein to represent LED bright for 10 black box, and 6 white boxes then represent and go out.In like manner, " 1100 ", " 0100 " and " 0111 " represent the 12nd grade, the 4th grade and the 7th grade respectively; As shown in Figure 6, schematic diagram is superposed for pulse-amplitude modulation and pulse width modulation.Light signal, by after transmission subsystem, is converted to the signal of telecommunication through photoelectric detector, carries out filter amplifying processing by pre-amplification circuit and rearmounted amplifying circuit, then carries out quantification by ADC analog to digital converter to the signal of telecommunication and be converted to digital signal.Then demodulation is carried out to PAM and PWM.By the second programmable gate array, signal is converted to vision signal again, then passes in the second liquid crystal display.Compared with signal in the second liquid crystal display by the first liquid crystal display, the error rate of system can be tested out, for the operation of verification system.
Above-described embodiment is only one embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify the substitute mode that all should be equivalence, be included within protection scope of the present invention.
Claims (7)
1., based on a visible light communication method for dual modulation technology, it is characterized in that, comprise the following steps:
The vision signal that information source sends by step 1, the first programmable gate array is converted to n bit binary number signal;
Described often group n bit binary number signal is converted to n by step 2, the first programmable gate array
2binary digits signal, wherein, n is positive integer, described n
2the corresponding n of binary digits signal
2the state of kind, the LED of often kind of bright respective number of state corresponding points, the LED chip of different number lights the change that can realize luminous flux, makes described COB packaged LED light fixture have n
2the change of level light intensity, described n
2the change of level light intensity and n
2level pulse-amplitude modulation;
Step 3, the first programmable gate array are by described n
2level pulse-amplitude modulation and pulse width modulation is superimposed, formation n
2+ k level light intensity changes, and wherein, k is positive integer;
Step 4, receiving subsystem respond to n by photoelectricity testing part
2+ k level light intensity changes, and generates n
2+ k level pulse electrical signal, after the signal receiving process of receiving subsystem, restores primary signal.
2. the visible light communication method based on dual modulation technology according to claim 1, it is characterized in that, described step 1 comprises the following steps:
Step 11, the first programmable gate array red, green and blue component to every frame video signal that information source sends carries out digital-to-analogue conversion quantification treatment respectively, forms raw pixel digital signal;
Step 12, the first programmable gate array convert 8 bit binary number signals to raw pixel digital signal, and arrange in order, be divided into one group of binary digital signal, output to LED drive circuit every n position.
3. the visible light communication method based on dual modulation technology according to claim 1, is characterized in that, in step 4, the method for described signal receiving process comprises the following steps:
Step 41, pre-amplification circuit and rearmounted amplifying circuit are to received n
2+ k level pulse electrical signal carries out amplification process and filtering process;
Step 42, to through amplifying process and the n of filtering process
2+ k level pulse electrical signal entered ADC digital to analog converter and carried out analog-to-digital conversion, generated n
2+ k binary digits signal, the second programmable gate array is n
2+ k binary digits signal carries out filtering pulse width modulation part, i.e. filtering k and obtain n
2binary digits signal, the second programming gate array is by described n
2binary digits signal is converted to n bit binary number signal;
Step 43, the second programmable gate array arrange sequentially to described n bit binary number signal, merge into one group of 8 bit binary number signal every 8, the second programmable gate array is converted to raw pixel digital signal described 8 bit binary number signals;
Described raw pixel digital signals revivification is every frame video signal by step 44, the second programmable gate array.
4. one kind realizes the visible light communication system of the visible light communication method based on dual modulation technology according to claim 1, comprise: launch subsystem, transmission subsystem and receiving subsystem, it is characterized in that, described transmitting subsystem has: the first programmable gate array, LED drive circuit and COB packaged LED light fixture, and described receiving subsystem has: photoelectricity testing part, ADC analog to digital converter and the second programmable gate array; Described transmission subsystem is used for the visible light signal that COB packaged LED light fixture sends to be transferred to photoelectricity testing part; Described first programmable gate array, LED drive circuit, COB packaged LED light fixture, photoelectricity testing part, ADC analog to digital converter are connected successively with the second programmable gate array; Described first programmable gate array exports n bit binary number signal, and the n bit binary number Signal transmissions exported to LED drive circuit, described n bit binary number signal drives COB packaged LED light fixture to carry out n
2level light intensity modulation, described COB packaged LED light fixture launches visible light signal to photoelectricity testing part, described photoelectricity testing part converts analog signal to visible light signal, described ADC digital to analog converter samples into n bit binary number signal the analog signal that photoelectricity testing part exports, and the n bit binary number Signal transmissions that described ADC digital to analog converter is sampled gives the second programmable gate array.
5. the visible light communication system of the visible light communication method based on dual modulation technology according to claim 4, it is characterized in that, described COB packaged LED light fixture comprises LED chip and corresponding LED drive circuit, and every block LED chip is independently controlled by corresponding LED drive circuit; Described LED drive circuit comprises: information source, variable resistor, high-speed buffer, BiasTee module, DC current source and current-limiting resistance, and described information source, variable resistor, high-speed buffer, BiasTee module are connected successively with current-limiting resistance; The positive pole of described DC current source is connected with information source, the negative pole of described DC current source and BiasTee model calling; Described BiasTee module comprises electric capacity and inductance; One end of described inductance is connected with the negative pole of DC current source, and the other end of described inductance is connected with the negative pole of electric capacity, and the positive pole of described electric capacity is connected with high-speed buffer; The signal of telecommunication that described information source exports is transferred to BiasTee module through high-speed buffer, and the signal that the DC signal that described DC current source exports and high-speed buffer transmit is coupled in BiasTee module, generates coupled electrical signal; Described coupled electrical signal is exported by current-limiting resistance.
6. the visible light communication system of the visible light communication method based on dual modulation technology according to claim 4, is characterized in that, described COB packaged LED light fixture is the LED array of n × n, every block LED chip individual packages.
7. the visible light communication system of the visible light communication method based on dual modulation technology according to claim 4, it is characterized in that, described transmitting subsystem also comprises: the first liquid crystal display and video camera, and described receiving subsystem also comprises pre-amplification circuit, rearmounted amplifying circuit and the second liquid crystal display; The first described liquid crystal display is all connected with the first programmable gate array with video camera, and photoelectricity testing part is connected with ADC digital to analog converter with rearmounted amplifying circuit by pre-amplification circuit, and the second programmable gate array is connected with the second liquid crystal display; Video signal transmission is given the first programmable gate array by described video camera; Described first programmable gate array gives the first liquid crystal display video signal transmission; Described photoelectricity testing part carries out amplification process analog signal by pre-amplification circuit; Described analog signal after amplification is carried out filtering process through rearmounted amplifying circuit and is transferred to ADC analog to digital converter again; Described second programmable gate array gives the second liquid crystal display video signal transmission.
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