CN204068977U - Led illumination communication system - Google Patents
Led illumination communication system Download PDFInfo
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- CN204068977U CN204068977U CN201420295519.2U CN201420295519U CN204068977U CN 204068977 U CN204068977 U CN 204068977U CN 201420295519 U CN201420295519 U CN 201420295519U CN 204068977 U CN204068977 U CN 204068977U
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Abstract
LED illumination communication system of the present utility model, is made up of emitter and receiving system, and described emitter comprises the transmission main control module, RGB-PPM modulation module, shaping pulse module, RGBLED drive circuit module, the RGBLED light source that connect successively; Described receiving system comprises the photoelectric detection module, signal processing circuit module, RGB-PPM demodulation module, the reception main control module that connect successively.The utility model realizes the different information of three-channel parallel communications, improve the transmission rate of data, adopt the problems such as RGB-PPM modulation efficiently solves traditional PPM efficiency of bandwidth use and the pulse duration is short, under identical efficiency of transmission (4bit) condition, bandwidth is reduced to 1/4 of 16PPM, the photoelectric detection module adopted can select wavelength, finally achieves illumination and the dual-use function that communicates.
Description
Technical field
The utility model relates to visible light communication, is specifically related to a kind of LED illumination communication system of RGB LED visible light communication technology.
Background technology
LED has long service life, the high and low cost of luminous efficiency, volume is little is widely used in the everyday devices such as room lighting, landscape lighting apparatus, traffic lights, various flat-panel screens with features such as fast response times.Visible light communication communicates while utilizing LED illumination just, adds illumination additional (value), increases economic efficiency.
But the transmission rate how improving visible light communication is one of key technology needing to solve.At present, much research is wished to improve transmission rate as much as possible at limited modulation bandwidth, and as technology such as OFDM modulation, MIMO, equilibriums, this adds complexity and the cost of system undoubtedly.On market, mostly illumination LED is blue-light excited yellow fluorescent powder, and its modulation bandwidth is very limited, thus the transmission rate of restriction visible light communication.Therefore, the feature that the utility model can be modulated respectively according to RGB LED, thus increase system transfer rate.
Utility model content
The utility model purport, for the deficiencies in the prior art, at least solves one of technical problem existed in prior art.
For this reason, the utility model provides that a kind of system is simple, cost is lower and the LED illumination communication system that transmission rate is fast, adopt three primary colors (RGB) LED, by control red (R), green (G), blue (B) three the ratio of look can synthesize the light of shades of colour, while illumination is provided, different information is modulated to respectively on RGB LED, 3 circuit-switched data parallel communicationss can be realized thus improve transmission rate.
A kind of LED illumination communication system, comprising: emitter and receiving system, is characterized in that
Described dispensing device comprises the transmission main control module, RGB-PPM modulation module, shaping pulse module, RGB LED drive circuit module, the RGB LED light source that connect successively; Described receiving system comprises the photoelectric detection module, signal processing circuit module, RGB-PPM demodulation module, the reception main control module that connect successively; Dispensing device is connected with receiving system by transmission line;
Described emitter comprises:
Send main control module, described transmission main control module is for sending data;
RGB-PPM modulation module, receives the data that described transmission main control module sends over, and carries out the pulse position modulation based on RGB LED, described data are modulated into three-channel parallel pulse data by RGB-PPM;
Shaping pulse module, for receiving described three-channel parallel pulse data, and the pulse duration by regulating peripheral resistance can change three road pulse in parallel data;
RGB LED drive circuit module, described driving is that constant current drives, and described RGB LED drive circuit receives the three-channel parallel pulse data exported after pulse duration shaping, and for controlling the luminous intensity of LED light source;
RGB LED light source, described RGB LED light source can send ruddiness (R), blue light (G), green glow (B), described RGB LED light source respectively by described RGB drive circuit module control and send the visible ray of certain strength according to the direct voltage of described RGB LED drive circuit module;
Described receiving system comprises:
Photoelectric detection module, described photoelectric detection module is three tunnels, receives light signal that described RGB LED light source sends and the three-channel parallel signal of telecommunication corresponding according to the strength derived value of received light signal exports;
Signal processing circuit module, is connected with described photoelectric detection module, receives and is amplified by the described three-channel parallel signal of telecommunication;
RGB-PPM demodulation module, with described signal processing circuit model calling, receives and forms parallel signal output after the three-channel parallel signal of telecommunication after described amplification is carried out RGB-PPM demodulation;
Receive main control module, receive the parallel signal that described RGB-PPM demodulation module sends.
Described emitter utilizes RGB LED while illumination, to carry out three circuit-switched data parallel transmissions in the mode of wavelength division multiplexing, the data message of 4bit is distributed to RGB LED, improve the transmission rate of data and improve bandwidth needed for PPM, RGB-PPM can be regulated to modulate the width of afterpulse by pulse shaping circuit, thus change the color of RGB LED synthesis light.
Further, described photoelectric detection module comprises collector lens, filter, photoelectric detector (PIN), described filter is between described photoelectric detector and collector lens, described photoelectric detector (PIN) is positioned at described collector lens focal position place, and described photoelectric detector (PIN) receives ruddiness (R), blue light (G) and green glow (B) signal respectively and changes into the signal of telecommunication and exports described signal processing circuit module to.
The wave-length coverage that described filter comprises optical bandpass filter is respectively the blue filter of the ruddiness filter of 560-650nm, the green glow filter of wave-length coverage 500 to 550nm and wave-length coverage 440-490nm.
Further, described RGB LED light source send out visible ray wave-length coverage be respectively ruddiness (R), the blue light (G) of 520 to 540nm, the green glow (B) of 460-470nm of 620-630nm.
Further, described signal processing circuit module comprises three tunnels and connects Trans-impedance preamplifier, agc circuit, filter circuit unit and amplitude limiting amplifier circuit successively, described Trans-impedance preamplifier receives the signal of telecommunication that described photoelectric detection module exports, and described amplitude limiting amplifier circuit is connected to described RGB-PPM demodulation module.
Further, described RGB-PPM modulation module is also convert one group of data that 4 bit digital in string graphic data are formed to 3 channel parallel datas as follows by the mode that RGB-PPM modulates:
Low 2 information of described one group of data adopt 4PPM to transmit by the blue-ray LED of RGB LED, and the 3rd information adopts 2PPM to transmit by the green light LED of RGB LED, and high-order information adopts 2PPM to transmit by the red-light LED of RGB LED.
The technical solution of the utility model, has following beneficial effect:
Emitter is modulated on RGB LED light source after information to be passed being modulated by RGB-PPM, realizes three-channel parallel and transmits different information, improve the transmission rate of data.Filter in photoelectric detection module is for selecting wavelength, and light signal is converted into the signal of telecommunication by PIN, carries out signal transacting subsequently and recovers primary signal, thus achieves illumination and the dual-use function that communicates.
Adopt RGB LED as illumination and the light source communicated, it has color rendering height and the high feature of luminous efficiency, and can synthesize the light of shades of colour by the ratio of adjustment three kinds of colors thus realize the effect of dynamic lighting;
Adopt the problems such as RGB-PPM modulation effectively can solve traditional PPM efficiency of bandwidth use and the pulse duration is short, under identical efficiency of transmission (4bit) condition, bandwidth is reduced to 1/4 of 16PPM by this method;
Adopt filter to be separated by the light signal of various wavelength, avoid interference and the intersymbol interference of surrounding environment light, improve the antijamming capability of system.
Additional aspect effect of the present utility model and advantage become obvious by description part below, or are recognized by practice of the present utility model.
Accompanying drawing explanation
Below above-mentioned and/or additional aspect effect of the present utility model and advantages, accompanying drawing will become obvious and easy understand in the description of embodiment, wherein:
Fig. 1 is the formation schematic diagram of the LED illumination communication system of the utility model embodiment;
Fig. 2 is in the utility model RGB-PPM pulse position modulation principle schematic;
Wherein, Fig. 1 and the corresponding relation between Reference numeral and component names are:
100 emitters, 110 send main control module, 120 RGB-PPM modulation modules, 130 shaping pulse modules, 140 RGB LED drive circuit modules, 150 RGB LED light sources, 300 transmission lines, 200 receiving systems, 210 receive main control module, 220 RGB-PPM demodulation modules, 230 signal processing circuit modules, 231 Trans-impedance preamplifiers, 232 agc circuits, 233 filter circuits, 234 amplitude limiting amplifier circuits, 250 photoelectric detection module, 251 collector lenses, 252 filters, 253 PIN.
Embodiment
In order to more clearly understand above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the drawings and specific embodiments, the utility model is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the utility model; but; the utility model can also adopt other to be different from mode described here to implement, and therefore, protection range of the present utility model is not by the restriction of following public specific embodiment.
Describe with reference to the accompanying drawings according to some embodiments of the utility model.
The LED illumination communication system that the utility model provides, as shown in Figure 1 and Figure 2, comprise: emitter 100 and receiving system 200, the light signal that dispensing device 100 sends arrives receiving system 200 by transmission line 300, and described dispensing device comprises the transmission main control module 110, RGB-PPM modulation module 120, shaping pulse module 130, RGB LED drive circuit module 140, the RGB LED light source 150 that connect successively; Described receiving system 200 comprises the photoelectric detection module 250, signal processing circuit module 230, RGB-PPM demodulation module 220, the reception main control module 210 that connect successively.Described transmission main control module 110 sends serial data to RGB-PPM modulation module 120; RGB-PPM modulation module 120 carries out the pulse position modulation based on RGB LED, and described serial data is modulated into three-channel parallel pulse data by RGB-PPM; Described shaping pulse module 130 is for receiving described three-channel parallel pulse data, and the pulse duration by regulating peripheral resistance can change three road pulse in parallel data; Described RGB LED drive circuit module 140 is that constant current drives, and described drive circuit receives the three-channel parallel pulse data exported after pulse duration shaping, and for the luminous intensity of control RGB LED light source 150; Described RGB LED light source 150 is respectively the LED light source sending ruddiness (R), blue light (G), green glow (B), described RGB LED light source 150 respectively by described drive circuit module 140 control and send the visible ray of certain strength according to the direct voltage of described drive circuit module; Described photoelectric detection module 250 is three tunnels, and it receives light signal that described RGB LED light source 150 sends and the three-channel parallel signal of telecommunication corresponding according to the strength derived value of received light signal exports; Signal processing circuit module 230 receives and the described parallel three road signals of telecommunication is amplified rear output; RGB-PPM demodulation module 220 receives and to form parallel signal after the signal of telecommunication after being amplified on described parallel three tunnels carries out RGB-PPM demodulation and export to and receive main control module 210.
As shown in Figure 2, described RGB-PPM modulation module 120 is also convert one group of data that 4 bit digital in string graphic data are formed to 3 channel parallel datas as follows by the mode that RGB-PPM modulates: low 2 information of this group adopt 4PPM to transmit by blue light (B) LED of RGB LED, 3rd information adopts 2PPM to transmit by green glow (G) LED of RGB LED, and high-order information adopts 2PPM to transmit by ruddiness (R) LED of RGB LED.RGB-PPM effectively can solve traditional PPM efficiency of bandwidth use and the problem such as the pulse duration is short, and under identical efficiency of transmission (4bit) condition, bandwidth is reduced to 1/4 of 16PPM by this method;
In the present embodiment, the pulse shaping circuit that shaping pulse module 130 is made up of trailing edge trigger, regulator potentiometer can change pulse duration, the output of described pulse shaping circuit is connected to RGB LED drive circuit module 140, thus different information is modulated on RGB LED respectively, R, G, B light intensity of RGB LED light source 150 can be changed thus the color of adjustment mixed light by regulating the driving direct voltage of R, G, B.Concrete, send main control module 110 and use MCU AT89C52, described pulse shaping circuit is made up of 74LS122 and peripheral circuit, and RGB LED drive circuit module is made up of 3 DD311 and peripheral circuit.
Described photoelectric detection module 250 comprises three collector lenses, 251, three filters, 252, three PIN 253, described filter 252 is between described PIN 253 and collector lens 251, described PIN 253 is positioned at place of portion, described collector lens 251 focal position, and described three PIN receive ruddiness (R), blue light (G) and green glow (B) signal respectively and light signal changed into the signal of telecommunication and export described signal processing circuit module 230 to.Described filter 252 only allows special wavelength light pass through, thus can effectively filtering carry the light signal of out of Memory and reduce the interference of bias light, filter is selected to need to consider centre wavelength, half-wave bandwidth, transmissivity, and centre wavelength and half-wave bandwidth are determined by RGB LED light source 150 emission wavelength range, and filter transmitance is the bigger the better, in order to better effectively utilize PIN, require that filter plate diameter should be greater than the effective range of receiving of PIN; PIN is placed on the focus place of collector lens 251, and PIN is converted to the signal of telecommunication focusing and filtered ruddiness (R), blue light (G) and green glow (B) signal; The output of PIN is connected to signal processing circuit module 230, signal processing circuit module 230 comprises Trans-impedance preamplifier 231, agc circuit 232, filter circuit unit 233 and the limiting amplifier 234 that 3 tunnels connect successively, described Trans-impedance preamplifier 231 receives the signal of telecommunication that described PIN exports, and the described 3 road signals of telecommunication export RGB-PPM demodulation module 220 to by limiting amplifier 234 after signal processing module 230 amplifies; RGB-PPM demodulation module 220 be delivered to after RGB-PPM demodulation is carried out to the 3 road signals of telecommunication after described amplification receive master control 210, demodulation principle and modulated process reverse.Concrete, in the present embodiment, receive master control and elect single-chip microcomputer as, the model of PIN is S6968, due to the blue light pulse duration be the half of other light source and carry information be the 2(of other light source doubly), and PIN 253 responsiveness is less than the responsiveness of other wavelength at blue wavelength range, and ruddiness decay is the fastest.Therefore, the performance of system should be weighed with the poorest one.Trans-impedance amplifier has the features such as dynamic range is large, low noise, low-power consumption, and limiting amplifier has the advantages such as simplicity of design, low in energy consumption, outward element is few, and concrete can adopt OPA4354 and peripheral circuit form trans-impedance amplifier and limiting amplifier; Adopt visible light communication may be subject to the interference of the surround lighting such as daylight, fluorescent lamp in addition, in order to better get rid of the interference of other light, after agc circuit, design the band pass filter be made up of OPA820 and peripheral circuit realize only allowing the signal of special frequency channel to pass through, suppress the interference and the noise that do not belong to this frequency range.
A specific embodiment, described RGB LED light source send out visible ray wave-length coverage be respectively ruddiness (R), the blue light (G) of 520 to 540nm, the green glow (B) of 460-470nm of 620-630nm.
The wave-length coverage of the optical bandpass filter that described filter adopts is respectively the blue light filter plate of the ruddiness filter plate of 560-650nm, the green glow filter plate of wave-length coverage 500 to 550nm and wave-length coverage 440-490nm.
RGB LED as the light source of visible light communication, and adopts RGB-PPM to modulate, and transmission rate can be improved 2(doubly), under identical efficiency of transmission (4bit) condition, bandwidth is reduced to 1/4 of 16PPM by this method.Receiving terminal filter plate can the interference of effectively filtering environmental light and noise by the Signal separator of the three different information in tunnels.Adopt the utility model RGB LED effectively can improve transmission rate and the bandwidth availability ratio of system in visible light communication.
In description of the present utility model, term " is connected ", " connection ", " fixing " etc. all should be interpreted broadly, and such as, " connection " can be that the signal of telecommunication connects, and light signal connects or other signals connect; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.
In the description of this specification, specific features, structure, material or feature that the description of term " embodiment ", " some embodiments " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (6)
1. a LED illumination communication system, comprising: emitter and receiving system, is characterized in that
Described emitter comprises the transmission main control module, RGB-PPM modulation module, shaping pulse module, RGB LED drive circuit module, the RGB LED light source that connect successively; Described receiving system comprises the photoelectric detection module, signal processing circuit module, RGB-PPM demodulation module, the reception main control module that connect successively; Emitter is connected with receiving system by transmission line;
Described emitter comprises:
Send main control module, described transmission main control module is for sending data;
RGB-PPM modulation module, receives the data that described transmission main control module sends over, and carries out the pulse position modulation based on RGB LED, described data are modulated into three-channel parallel pulse data by RGB-PPM;
Shaping pulse module, for receiving described three-channel parallel pulse data, and the pulse duration by regulating peripheral resistance can change three road pulse in parallel data;
RGB LED drive circuit module, described driving is that constant current drives, and described RGB LED drive circuit receives the three-channel parallel pulse data exported after pulse duration shaping, and for controlling the luminous intensity of LED light source;
RGB LED light source, described RGB LED light source can send ruddiness (R), blue light (G), green glow (B), described RGB LED light source respectively by described RGB drive circuit module control and send the visible ray of certain strength according to the direct voltage of described RGB LED drive circuit module;
Described receiving system comprises:
Photoelectric detection module, described photoelectric detection module is three tunnels, receives light signal that described RGB LED light source sends and the three-channel parallel signal of telecommunication corresponding according to the strength derived value of received light signal exports;
Signal processing circuit module, is connected with described photoelectric detection module, receives and is amplified by the described three-channel parallel signal of telecommunication;
RGB-PPM demodulation module, with described signal processing circuit model calling, receives and forms parallel signal output after the three-channel parallel signal of telecommunication after described amplification is carried out RGB-PPM demodulation;
Receive main control module, receive the parallel signal that described RGB-PPM demodulation module sends.
2. LED illumination communication system according to claim 1, is characterized in that,
Described photoelectric detection module comprises collector lens, filter, photoelectric detector, described filter is between described photoelectric detector and collector lens, described photoelectric detector is positioned at described collector lens focal position place, and described photoelectric detector receives ruddiness (R), blue light (G) and green glow (B) signal respectively and changes into the signal of telecommunication and exports described signal processing circuit module to.
3. LED illumination communication system according to claim 2, it is characterized in that, the wave-length coverage that described filter comprises optical bandpass filter is respectively the blue filter of the ruddiness filter of 560-650nm, the green glow filter of wave-length coverage 500 to 550nm and wave-length coverage 440-490nm.
4. LED illumination communication system according to claim 2, is characterized in that,
Described RGB LED light source send out visible ray wave-length coverage be respectively ruddiness (R), the blue light (G) of 520 to 540nm, the green glow (B) of 460-470nm of 620-630nm.
5. LED illumination communication system according to claim 1, is characterized in that,
Described signal processing circuit module comprises three tunnels and connects Trans-impedance preamplifier, agc circuit, filter circuit and amplitude limiting amplifier circuit successively, described Trans-impedance preamplifier receives the signal of telecommunication that described photoelectric detection module exports, and described amplitude limiting amplifier circuit is connected to described RGB-PPM demodulation module.
6. LED illumination communication system according to claim 1, is characterized in that,
Described RGB-PPM modulation module is also convert one group of data that 4 bit digital in serial data are formed to 3 channel parallel datas as follows by the mode that RGB-PPM modulates:
Low 2 information of described one group of data adopt 4PPM to transmit by the blue-ray LED of RGB LED, and the 3rd information adopts 2PPM to transmit by the green light LED of RGB LED, and high-order information adopts 2PPM to transmit by the red-light LED of RGB LED.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038283A (en) * | 2014-06-05 | 2014-09-10 | 桂林电子科技大学 | LED lighting communication system |
| CN105227244A (en) * | 2015-08-26 | 2016-01-06 | 联想(北京)有限公司 | A kind of signaling method, signal acceptance method, transmitting apparatus and receiving equipment |
| CN105227239A (en) * | 2015-10-30 | 2016-01-06 | 天津普泰国信科技有限公司 | A kind of wireless communications method based on visible light colors and system |
| CN105227240A (en) * | 2015-10-30 | 2016-01-06 | 上海航天测控通信研究所 | Based on the industrial communication systems of visible ray |
| CN105960045A (en) * | 2016-04-28 | 2016-09-21 | 华南师范大学 | Realization method and device of communication illumination sharing system based on LED high illumination efficiency |
| CN111082865A (en) * | 2019-11-29 | 2020-04-28 | 徐州智谷光频产业研究院有限公司 | Novel point-to-point visible light communication transceiver of wireless network bridge |
-
2014
- 2014-06-05 CN CN201420295519.2U patent/CN204068977U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038283A (en) * | 2014-06-05 | 2014-09-10 | 桂林电子科技大学 | LED lighting communication system |
| CN105227244A (en) * | 2015-08-26 | 2016-01-06 | 联想(北京)有限公司 | A kind of signaling method, signal acceptance method, transmitting apparatus and receiving equipment |
| CN105227244B (en) * | 2015-08-26 | 2017-11-28 | 联想(北京)有限公司 | A kind of signaling method, signal acceptance method, send equipment and receiving device |
| CN105227239A (en) * | 2015-10-30 | 2016-01-06 | 天津普泰国信科技有限公司 | A kind of wireless communications method based on visible light colors and system |
| CN105227240A (en) * | 2015-10-30 | 2016-01-06 | 上海航天测控通信研究所 | Based on the industrial communication systems of visible ray |
| CN105960045A (en) * | 2016-04-28 | 2016-09-21 | 华南师范大学 | Realization method and device of communication illumination sharing system based on LED high illumination efficiency |
| CN105960045B (en) * | 2016-04-28 | 2019-02-26 | 华南师范大学 | The implementation method and device of communication illumination sharing system based on LED high illumination efficiency |
| CN111082865A (en) * | 2019-11-29 | 2020-04-28 | 徐州智谷光频产业研究院有限公司 | Novel point-to-point visible light communication transceiver of wireless network bridge |
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