CN105656554A - Visible light communication system and method - Google Patents
Visible light communication system and method Download PDFInfo
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- CN105656554A CN105656554A CN201610061532.5A CN201610061532A CN105656554A CN 105656554 A CN105656554 A CN 105656554A CN 201610061532 A CN201610061532 A CN 201610061532A CN 105656554 A CN105656554 A CN 105656554A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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Abstract
The invention provides a visible light communication system and a visible light communication method. According to the system and the method, after a signal generator generates a corresponding visible light signal based on a received input signal, a single photon avalanche diode detector is used for detecting the current photon number in the visible light signal, and a signal demodulator compares the current photon number with a preset threshold, and demodulates a corresponding output signal based on the comparison result to meet the requirements of subsequent devices. Thus it can be seen, compared with the existing visible light communication system, the visible light communication system adopts the single photon avalanche diode detector as the optical detector, thus the response speed is increased and the power consumption is reduced, and the sensitivity of detecting the visible light signal is greatly improved; particularly for an application scenario of long-distance transmission of weak light, the detection efficiency and the data transmission reliability are ensured, and the situation that the data cannot be normally transmitted is avoided.
Description
Technical field
Present application relates generally to optical communication field, more particularly to a kind of visible light communication system and method.
Background technology
In the whole system and transmitting procedure of communications, optical communication system is as most basic, most important ingredient, it is actually a kind of communication technology being transmission medium with light wave, there is transmission frequency bandwidth, the advantages such as message capacity is big and anti-electromagnetic interference capability is strong, according to the different criteria for classifying, optic communication can be divided into dissimilar, as infrared communication can be divided into according to wavelength, visible light communication and ultraviolet communication, wired optic communication (such as fiber optic communication) and wireless light communication etc. can be divided into according to transmission medium, difference according to application scenarios, select corresponding optical communication technique.
Wherein, visible light communication technology (VisibleLightCommunication, VLC) refer to that the light utilizing visible light wave range is as information carrier, transmission medium without wire message way such as optical fiber, directly transmit the communication mode of optical signal in atmosphere, visible, it achieves green low-carbon, near-zero power consumption communication, the defects such as the leakage that can also be prevented effectively from radio communication electromagnetic signal, future will with WIFI, 3G, 4G, even the communication technology such as 5G merges alternately, at Internet of Things, family, aviation, transportation, the field such as indoor navigation and underground work is brought innovation and application and is worth experience.
In existing visible light communication system, it is generally all utilize photodiode (Photo-Diode, PD) as converting optical signals into signal of telecommunication photo-detector, but, when needs distance carries out optical transport, especially in the transmitting procedure of faint light, generally all can be inadequate because of existing this photodetector sensibility, the problems such as power consumption is high and response speed is slow, and affect its detection efficient, and then affect message transmission rate and reliability, resulting even in data cannot normal transmission.
Summary of the invention
In view of this, the invention provides a kind of visible light communication system and method, solve that the photodetector sensibility in existing visible light communication is inadequate, power consumption is high and response speed is slow, thus affecting its detection efficient, and then affect message transmission rate and reliability, resulting even in data cannot the technical problem of normal transmission.
To achieve these goals, this application provides techniques below scheme:
A kind of visible light communication system, described system includes:
Signal generator, for based on the input signal received, producing corresponding visible light signal;
Single photon avalanche diode detector, for detecting the current number of photons in described visible light signal;
Demodulator of PM signal PM, for receiving the described current number of photons that described single photon avalanche diode detector sends, compares described current number of photons and judging threshold, and result based on the comparison, demodulates the output signal corresponding with described input signal.
Preferably, described signal generator includes:
Signaling conversion circuit, for being converted to corresponding analogue signal by the input signal received;
LED module, for producing visible light signal under the control of described analogue signal.
Preferably, described system also includes:
Optical transport channel, the first scope of the described visible light signal transmission extremely described photon avalanches diode detector for described signal generator is produced.
Preferably, described system also includes:
Signal driving device, is used for utilizing pre-set programs to produce described input signal, and sends to described signal generator.
Preferably, described system also includes:
Suggestion device, for when number of photons current described in described single photon avalanche diode detector gained meets preset requirement, exporting corresponding information.
Preferably, described signal driving device is specially mobile terminal, is used for utilizing MATLAB software to produce OOK signal, and sends to described signal generator.
A kind of visible light communication method, is applied to visible light communication system as above, and described method includes:
Based on the input signal received, produce corresponding visible light signal;
Detect the current number of photons in described visible light signal, and described current number of photons and judging threshold are compared;
Result based on the comparison, demodulates the output signal corresponding with described input signal.
Preferably, described produce corresponding visible light signal based on the input signal received, including:
The input signal received is converted to corresponding analogue signal;
The LED module that described analogue signal controls described visible light communication system is utilized to produce corresponding visible light signal.
Preferably, described input signal is specially OOK signal, then described method also includes:
MATLAB software is utilized to produce described OOK signal.
Preferably, before the current number of photons in the described visible light signal of described detection, described visible light signal is transmitted in the single photon avalanche diode detector of described visible light communication system in light beam mode.
As can be seen here, compared with prior art, this application provides a kind of visible light communication system and method, at signal generator based on the input signal received, after producing corresponding visible light signal, the application detects the current number of photons in this visible light signal by utilizing single photon avalanche diode detector, and after this current number of photons and pre-determined threshold being compared by demodulator of PM signal PM, result based on the comparison, demodulates and exports signal accordingly, to meet the demand of subsequent device. As can be seen here, compared with existing visible light communication system, the application utilizes single-photon avalanche diode as the photo-detector of visible light communication system, not only accelerate response speed and reduce power consumption, and substantially increase the sensitivity of detection visible light signal, especially the application scenarios to the long range propagation of faint light, it is ensured that the reliability of detection efficient and data transmission, it is to avoid data cannot the generation of situation of normal transmission.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
The structural representation of a kind of visible light communication system embodiment that Fig. 1 provides for the application;
The structural representation of the another kind of visible light communication system embodiment that Fig. 2 provides for the application;
The structural representation of another visible light communication system embodiment that Fig. 3 provides for the application;
The schematic flow sheet of a kind of visible light communication embodiment of the method that Fig. 4 provides for the application;
The schematic flow sheet of a kind of visible light communication method preferred embodiment that Fig. 5 provides for the application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
This application provides a kind of visible light communication system and method, at signal generator based on the OOK signal received, after producing corresponding visible light signal, now, the application will utilize single photon avalanche diode detector to detect this visible light signal, to obtain the current number of photons in this visible light signal, and after this current number of photons and pre-determined threshold being compared by demodulator of PM signal PM, result based on the comparison, demodulates and exports signal accordingly, to meet the demand of subsequent device. As can be seen here, compared with existing visible light communication system, the application utilizes single-photon avalanche diode as the photo-detector of visible light communication system, not only accelerate response speed and reduce power consumption, and substantially increase the sensitivity of detection visible light signal, especially the application scenarios to the long range propagation of faint light, it is ensured that the reliability of detection efficient and data transmission, it is to avoid data cannot the generation of situation of normal transmission.
Understandable in order to enable the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
As it is shown in figure 1, the structural representation of a kind of visible light communication system embodiment provided for the application, in the present embodiment, this system may include that
Signal generator 100, for based on the input signal received, producing corresponding visible light signal.
In the present embodiment, this signal generator can be specifically arbitrary waveform signal generator, and this is not construed as limiting by the application, specifically can determine according to actual needs, and the application will not enumerate at this. In actual applications, this signal generator will be converted to analogue signal the data signal (i.e. this input signal) received, and launches visible light signal controlling LED module, namely controls LED luminous.
Visible, as in figure 2 it is shown, this signal generator 100 may include that
Signaling conversion circuit 110, for being converted to corresponding analogue signal by the input signal received.
Wherein, this signaling conversion circuit 110 can be specifically D/A converting circuit, specifically can refer to existing D/A converting circuit, as long as input signal and digital signal can be converted to corresponding analogue signal, the application does not limit its particular circuit configurations.
LED module 120, for producing visible light signal under the control of described analogue signal.
In actual applications, this LED module 120 specifically can include at least one LED chip or LED etc., and this is not construed as limiting by the application, and, under the control of this analogue signal, the visible light signal that this LED module 120 produces can be launched with the form of light beam, but is not limited thereto.
Optionally, on the basis of above-described embodiment, this system can also include:
Signal driving device, is used for utilizing pre-set programs to produce above-mentioned input signal, and sends this input signal to signal generator 100.
In actual applications, this signal driving device can be specifically such as mobile terminals such as computers, can also be the equipment such as host computer, this is not construed as limiting by the application, specifically can install in these equipment or mobile terminal and produce OOK (On-OffKeying such as MATLAB software etc., on-off keying) signal, namely the signal being continually changing between 1 and 0, the process how utilizing MATLAB software emulation to obtain this OOK signal is not construed as limiting by the application, and, the generation of this OOK signal is also not limited to this kind of mode of MATLAB software emulation, other OOK signal transmission circuits can also be adopted to obtain this OOK signal, specifically can refer to existing OOK signal producing method, the application will not enumerate at this.
As can be seen here, signal generator 100 transfers OOK signal to corresponding analogue signal, when driving LED module to launch visible ray, because this OOK signal is the signal being continually changing between 1 and 0, thus, the intensity of the visible light signal that this LED module produces also can be dynamic, intuitively this LED module will launch the bright visible ray being secretly continually changing, wherein, the OOK signal of visible light (namely visual intensity the is big) correspondence launched is now 1, otherwise, if the OOK signal that the visible ray launched dark (namely visual intensity is little) is corresponding is now 0, that is, the visible bright dark change that LED module is launched is consistent with the change of OOK signal amplitude.
Wherein, the maximum intensity value of the visible light signal that this LED module is launched and minimal intensity value can need to set according to its application scenarios, and this is not construed as limiting by the application.
Single photon avalanche diode detector 200, for detecting the current number of photons in this visible light signal.
At present, single photon detection is the emerging Detection Techniques grown up this year, has developed comparatively ripe detecting technique with other and has compared, and the light of single photon detection can be more faint, can reach photon magnitude (10-19W) energy of level, has begun with critically important application in quantum communication, astrosurveillance, optical microphotograph, laser ranging and imaging etc.
Wherein, single-photon avalanche diode (SinglePhotonAvalancheDiode, SPAD) big with its avalanche gain, fast response time, detection efficient high, volume is little, light weight and the feature such as low in energy consumption become the best device making single-photon detector, the integrated single photon avalanche diode detector of array can also obtain time and the spatial information of photon signal so that it is is widely applied in Feebleness Light Signal Examining field.
In the present embodiment practical application, corresponding visible light signal is produced at signal generator, that is, after the corresponding analogue signal being converted to determines that LED module launches visible light signal, this visible light signal will be irradiated in this single photon avalanche diode detector, so that this single photon avalanche diode detector obtains current number of photons from this visible light signal, for as the foundation judging transmitted signal.
It should be noted that, the process that single photon avalanche diode detector is obtained current number of photons by the application when by radiation of visible light is not construed as limiting, as long as the number of photons in each moment after visible light signal is irradiated in this single photon avalanche diode detector can be obtained.
Optionally, in actual applications, on the basis of above-described embodiment, this system can also include:
Suggestion device, for when this current number of photons of single photon avalanche diode detector gained meets preset requirement, exporting corresponding information.
Based on this, excessively faint when running into visible light signal, it is impossible to when accurately judging the signal of its transmission, it is possible to directly point out staff by this suggestion device, in order to take corresponding strategy in time, it is ensured that the normal transmission of data. Now, above-mentioned pre-conditioned can be to ensure that single photon avalanche diode detector can accurately detect the minimum standards of visible light signal, namely in the current number of photons obtained lower than this minimum standards, it will affect the transmitting of data.
Wherein, the minimum light subnumber during this is pre-conditioned can be determined according to factors such as this systematic difference scenes, and its concrete numerical value is not construed as limiting by the application. And, in actual applications, this suggestion device can be buzzer, display lamp or voice module etc., and this is not construed as limiting by the application.
Additionally, photon counting and dark counting about this single photon avalanche diode detector all can obey Poisson distribution (a kind of discrete probability distribution), calculate data transmission error rate will pass through this Poisson distribution, specifically can refer to the existing quantum bit error rate computational methods based on single-photon source with Poisson distribution, the application is not described in detail in this.
Now, when calculated transmission error rates is more than first threshold, it is possible to export corresponding information by this suggestion device, to remind staff again to transmit data, thus ensureing reliability and the accuracy of transmission the data obtained.
Demodulator of PM signal PM 300, for receiving the described current number of photons that single photon avalanche diode detector 200 sends, compares described current number of photons and judging threshold, and result based on the comparison, demodulates the output signal corresponding with described input signal.
In actual applications, this demodulator of PM signal PM 300 can adopt this decoded mode of hard decision, concrete, after single photon avalanche diode detector 200 obtains current number of photons, itself and judging threshold are compared, thus utilizing this hard decision mode to demodulate the output signal corresponding with exporting signal.
Wherein, this judging threshold specifically can be determined according to the maximum photon number received and minimum light subnumber, as taken the meansigma methods of this maximum photon number and minimum light subnumber as this judging threshold, but is not limited thereto.
Based on this calculation, assume that the maximum photon number received is 100, minimum light subnumber is 0, so, the judging threshold of hard decision mode can be set to 50, afterwards, after this single photon avalanche diode detector 200 obtains number of photons and above-mentioned current number of photons every time, all itself and this judging threshold are compared, if this current number of photons is more than 50, can determine that current time is 1 through the signal that optical transport receives; Otherwise being 0, and gained result of determination exported, concrete, this decoding signals gained output signal, using carrying out, as decoder, first code of decoding, only takes 1 or 0 two value, and this is not construed as limiting by the application.
As another embodiment of the application, as shown in Figure 3, on the basis of above-described embodiment, this system can also include: optical transport channel 400, transmits the first scope to single photon avalanche diode detector 200 for the visible light signal produced by signal generator 100.
In actual applications, when especially needing this single photon avalanche diode detector 200 distance detection faint light, in order to ensure the accuracy of testing result, namely reducing transmission error rates, the present embodiment can realize the long range propagation of visible light signal by this optical transport channel 400.
Wherein, the visible light signal launched due to LED module can transmit with the form of light beam, thus, this optical transport channel 400 can be long pipeline, and the material making this long pipeline can be selected for the material of not extinction, composition structure and the making material thereof of this optical transport channel 400 of the application are not especially limited.
Certainly, it should be noted that, this visible light signal can also be transmitted by air, it is not absolutely required to tangible optical transport channel, specifically can according to the application scenarios of this visible light communication system it needs to be determined that, the application no longer describes in detail one by one at this.
In sum, in this application, when signal generator is based on the input signal received, after producing corresponding visible light signal, the application will utilize single photon avalanche diode detector to detect the current number of photons in this visible light signal, and after this current number of photons and pre-determined threshold being compared by demodulator of PM signal PM, result based on the comparison, demodulate and export signal accordingly, to meet the demand of subsequent device. As can be seen here, compared with existing visible light communication system, the application utilizes single-photon avalanche diode as the photo-detector of visible light communication system, not only accelerate response speed and reduce power consumption, and substantially increase the sensitivity of detection visible light signal, especially the application scenarios to the long range propagation of faint light, it is ensured that the reliability of detection efficient and data transmission, it is to avoid data cannot the generation of situation of normal transmission.
And, because of the characteristic of this single-photon avalanche diode, the visible light communication system of the present embodiment can carry out the visible light signal of distance or extremely low brightness and propagate, it is ensured that the privacy of propagated information and safety. The situation of monitoring in real time badly and is manually cannot be carried out particularly in applied environment, in the sights such as underground work, Elevator Monitoring and maintenance, utilize this visible light communication system being made up of single photon avalanche diode detector of the application, the promptness of the information transmission ensured and reliability, to facilitate the safety monitoring to this kind of operation process and management.
As shown in Figure 4, schematic flow sheet for a kind of visible light communication embodiment of the method that the application provides, the method can apply to the visible light communication system that the various embodiments described above provide, the present embodiment does not repeat them here composition structure and the function thereof of this visible light communication system of the application, specifically can refer to the description of above-described embodiment corresponding part, in the present embodiment, the method may comprise steps of:
Step S41: based on the input signal received, produce corresponding visible light signal.
In the present embodiment practical application, in the available electronic equipment such as computer, host computer, software such as MATLAB software produces OOK signal and namely inputs signal, afterwards, this input signal is sent to arbitrary waveform signal generator, make it that this OOK signal (it is digital signal) is converted to corresponding analogue signal, thus controlling LED module to launch visible light signal, specifically can launch with beam pattern, but being not limited thereto.
Wherein, the amplitude of the OOK signal owing to producing is to be continually changing between 1 and 0, thus, the light intensity of the visible light signal of the response produced accordingly also can be dynamic, being continually changing it is to say, the visible ray launched is light and shade, concrete change frequency and scope can be determined according to the OOK signal produced, the information content that this OOK signal then transmits according to actual needs is determined, the application no longer describes in detail one by one at this.
Step S42: detect the current number of photons in this visible light signal, and this current number of photons and judging threshold are compared.
Wherein, this judging threshold can be determined according to the maximum photon number received and minimum light subnumber, as taken the meansigma methods of this maximum photon number and minimum light subnumber, but is not limited thereto.
Description in conjunction with said system embodiment corresponding part, the application utilizes single photon avalanche diode detector to substitute the photodiode in existing visible light communication system, substantially increase detection sensitivity, detection especially for distance and faint light, ensure that the reliability of optical transport information and safety, and reduce power consumption, improve response speed, and then achieve the transmission of high efficiency data.
Wherein, the present embodiment can adopt hard decision mode to be decoded decoding, namely after LED emission goes out visible light signal, this visible light signal will be irradiated in single photon avalanche diode detector, thus utilizing the characteristic of this single-photon avalanche diode self information that this visible light signal transmits to be detected accurately and reliably, concrete, the current number of photons every time obtained and above-mentioned judging threshold can be compared, if the current number of photons of gained is less than this judging threshold, then judge that the OOK signal in corresponding moment is as 0; Otherwise it is 1.
Optionally, on the basis of above-described embodiment, the method can also include: whether the checking current number of photons of single photon avalanche diode detector gained meets preset requirement, if so, exports corresponding information. It should be noted that the concrete way of output of this information is not construed as limiting by the application, it is possible to export in modes such as buzzer, display lamp flicker or voice signals, but be not limited thereto.
Wherein, this is pre-conditioned can be to ensure that single photon avalanche diode detector can accurately detect the minimum standards of visible light signal, namely in the current number of photons obtained lower than this minimum standards, it will affect the transmitting of data.
Additionally, the method obtaining current number of photons about single-photon avalanche diode is referred to photon counting and the dark counting method of existing single photon avalanche diode detector, the application is not described in detail in this, and, this photon counting and dark counting all can obey Poisson distribution, so that the application is also based on this Poisson distribution and calculates data transmission error rate.
After calculating data transmission error rate, can also determine whether that whether it is more than first threshold, if so, can also export corresponding information, to remind staff or signal driving device again to transmit data, to ensure reliability and the accuracy of transmission the data obtained.
Step S43: result based on the comparison, demodulates the output signal corresponding with this input signal.
In conjunction with above-mentioned analysis it can be seen that the present embodiment can demodulate the input signal of visible light signal transmission in this way, namely send to devices such as follow-up decoders as corresponding output signal, to meet the demand of subsequent device.
Based on above-mentioned analysis, in the present embodiment, when signal generator is based on the input signal received, after producing corresponding visible light signal, the application will utilize single photon avalanche diode detector to detect the current number of photons in this visible light signal, and after this current number of photons and pre-determined threshold being compared by demodulator of PM signal PM, result based on the comparison, demodulate and export signal accordingly, to meet the demand of subsequent device.As can be seen here, compared with existing line-of-sight propagation, the application utilizes single-photon avalanche diode as the photo-detector of visible light communication system, not only accelerate response speed and reduce power consumption, and substantially increase the sensitivity of detection visible light signal, especially the application scenarios to the long range propagation of faint light, it is ensured that the reliability of detection efficient and data transmission, it is to avoid data cannot the generation of situation of normal transmission.
As shown in Figure 5, schematic flow sheet for a kind of visible light communication method preferred embodiment that the application provides, the method can apply to the visible light communication system that the various embodiments described above provide, the present embodiment does not repeat them here composition structure and the function thereof of this visible light communication system of the application, specifically can refer to the description of above-described embodiment corresponding part, in the present embodiment, the method may comprise steps of:
Step S51: utilize MATLAB software to produce OOK signal.
It should be noted that can refer to existing OOK signal generating method about the process how utilizing MATLAB software emulation to obtain this OOK signal, the application no longer describes in detail one by one at this, and, the producing method of this OOK signal is not limited to.
Step S52: this OOK signal received is converted to corresponding analogue signal.
Step S53: utilize this analogue signal to control LED module and produce corresponding visible light signal, to make this visible light signal be transmitted into single photon avalanche diode detector in light beam mode.
Wherein, owing to this OOK signal is the signal being continually changing before 1 and 0, thus, the visible ray that LED module produces also can secretly bright be continually changing, and the change of change step and OOK signal acts in agreement, namely when this OOK signal is 1, the visible ray that this LED module is launched is brighter; Otherwise, when this OOK signal is 0, the visible ray that this LED module is launched is dark.
Step S54: obtain the current number of photons of this visible light signal, and itself and judging threshold are compared.
In conjunction with the description of above-described embodiment corresponding part, this decision threshold can be determined according to the maximum photon number that this single photon avalanche diode detector receives and minimum light subnumber, but is not limited thereto; And, the method how utilizing single photon avalanche diode detector calculating to obtain current number of photons is not construed as limiting by the application.
Step S55: result based on the comparison, demodulates the output signal corresponding with this OOK signal.
As can be seen here, the application utilizes single-photon avalanche diode as the photo-detector of visible light communication system, detect the visible light signal of transmission, substantially increase detection efficiency and response speed, and reduce power consumption etc., transmitting particularly in distance or faint light in the application scenarios of information, the visible light communication method based on this visible light communication system that the present embodiment provides ensure that the reliability of these transmission of visible light data, safety and promptness.
Finally, it should be noted that, about in the various embodiments described above, the relational terms of such as first, second or the like is used merely to separate an operation, unit or module and another operation, unit or block region, and not necessarily requires or imply the relation that there is any this reality between these unit, operation or module or order. And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method or system not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method or system. When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method or system.
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually referring to.For method disclosed in embodiment, due to its with embodiment disclosed in system corresponding, so what describe is fairly simple, relevant part illustrates referring to components of system as directed.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention. The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments. Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. a visible light communication system, it is characterised in that described system includes:
Signal generator, for based on the input signal received, producing corresponding visible light signal;
Single photon avalanche diode detector, for detecting the current number of photons in described visible light signal;
Demodulator of PM signal PM, for receiving the described current number of photons that described single photon avalanche diode detector sends, compares described current number of photons and judging threshold, and result based on the comparison, demodulates the output signal corresponding with described input signal.
2. system according to claim 1, it is characterised in that described signal generator includes:
Signaling conversion circuit, for being converted to corresponding analogue signal by the input signal received;
LED module, for producing visible light signal under the control of described analogue signal.
3. system according to claim 1, it is characterised in that described system also includes:
Optical transport channel, the first scope of the described visible light signal transmission extremely described photon avalanches diode detector for described signal generator is produced.
4. system according to claim 1, it is characterised in that described system also includes:
Signal driving device, is used for utilizing pre-set programs to produce described input signal, and sends to described signal generator.
5. the system according to claim 1-4 any one, it is characterised in that described system also includes:
Suggestion device, for when number of photons current described in described single photon avalanche diode detector gained meets preset requirement, exporting corresponding information.
6. system according to claim 4, it is characterised in that described signal driving device is specially mobile terminal, is used for utilizing MATLAB software to produce OOK signal, and sends to described signal generator.
7. a visible light communication method, it is characterised in that being applied to the visible light communication system as described in claim 1-6 any one, described method includes:
Based on the input signal received, produce corresponding visible light signal;
Detect the current number of photons in described visible light signal, and described current number of photons and judging threshold are compared;
Result based on the comparison, demodulates the output signal corresponding with described input signal.
8. method according to claim 7, it is characterised in that described produce corresponding visible light signal based on the input signal received, including:
The input signal received is converted to corresponding analogue signal;
The LED module that described analogue signal controls described visible light communication system is utilized to produce corresponding visible light signal.
9. method according to claim 7, it is characterised in that described input signal is specially OOK signal, then described method also includes:
MATLAB software is utilized to produce described OOK signal.
10. the method according to claim 7-9 any one, it is characterized in that, before current number of photons in the described visible light signal of described detection, described visible light signal is transmitted in the single photon avalanche diode detector of described visible light communication system in light beam mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107147598A (en) * | 2017-04-18 | 2017-09-08 | 东莞信大融合创新研究院 | A kind of visible light communication methods, devices and systems under water |
| CN108880682A (en) * | 2018-07-25 | 2018-11-23 | 中国人民解放军战略支援部队信息工程大学 | A kind of visible light communication dimming controlling method and system based on coding |
| CN110162500A (en) * | 2019-06-03 | 2019-08-23 | 济南浪潮高新科技投资发展有限公司 | A kind of Waveform generation method and system based on Internet of Things mode |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014118537A2 (en) * | 2013-01-31 | 2014-08-07 | Malvern Instruments Limited | Single photon counting |
| CN103986516A (en) * | 2014-05-30 | 2014-08-13 | 中国人民解放军信息工程大学 | Visible light communication system and method |
| CN204886965U (en) * | 2015-08-08 | 2015-12-16 | 中国人民解放军理工大学 | No linear light communication system based on photon counting |
-
2016
- 2016-01-28 CN CN201610061532.5A patent/CN105656554A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014118537A2 (en) * | 2013-01-31 | 2014-08-07 | Malvern Instruments Limited | Single photon counting |
| CN103986516A (en) * | 2014-05-30 | 2014-08-13 | 中国人民解放军信息工程大学 | Visible light communication system and method |
| CN204886965U (en) * | 2015-08-08 | 2015-12-16 | 中国人民解放军理工大学 | No linear light communication system based on photon counting |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107147598A (en) * | 2017-04-18 | 2017-09-08 | 东莞信大融合创新研究院 | A kind of visible light communication methods, devices and systems under water |
| CN107147598B (en) * | 2017-04-18 | 2019-08-30 | 东莞信大融合创新研究院 | A kind of underwater visible light communication methods, devices and systems |
| CN108880682A (en) * | 2018-07-25 | 2018-11-23 | 中国人民解放军战略支援部队信息工程大学 | A kind of visible light communication dimming controlling method and system based on coding |
| CN110162500A (en) * | 2019-06-03 | 2019-08-23 | 济南浪潮高新科技投资发展有限公司 | A kind of Waveform generation method and system based on Internet of Things mode |
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