CN102723992A - Visible light signal transmission device based on keying modulation - Google Patents
Visible light signal transmission device based on keying modulation Download PDFInfo
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- CN102723992A CN102723992A CN2012101846920A CN201210184692A CN102723992A CN 102723992 A CN102723992 A CN 102723992A CN 2012101846920 A CN2012101846920 A CN 2012101846920A CN 201210184692 A CN201210184692 A CN 201210184692A CN 102723992 A CN102723992 A CN 102723992A
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Abstract
An embodiment of the invention provides a visible light signal transmission device based on keying modulation. The visible light signal transmission device based on keying modulation comprises an encoder, a keying modulator and a light-emitting unit, wherein the encoder is respectively connected with a signal source and a pseudo code generator in state change along with unit time, the keying modulator is connected with the encoder, and the light-emitting unit is connected with the keying modulator. The visible light signal transmission device based on keying modulation is capable of improving safety of the photonic Internet of Things, low in cost and easy to implement.
Description
[technical field]
The present invention relates to photon technology of Internet of things technical field, concrete, relate to a kind of visible light signal dispensing device based on the keying modulation.
[background technology]
The wireless light communication technology is claimed the visible light communication again, and its high-frequency through led light source is glimmered and communicated, and has light to represent 1, unglazed representative 0, and its transmission rate is up to the per second gigabit.The wireless light communication technology is because its data are difficult for being disturbed and catching, and optical communication equipment is made simple and should not be damaged or demagnetization, can be used for making the wireless optical encryption key pair.Compare with microwave technology, wireless light communication has quite abundant frequency spectrum resource, and this is that general microwave communication and radio communication are incomparable; Visible light communication can be suitable for any communication protocol, be applicable to any environment simultaneously; Aspect fail safe, it compares traditional magnetic material, need not to worry the demagnetization problem, needn't worry that more Content of Communication stolen by the people; The equipment of wireless light communication sets up convenient flexibly, and with low cost, is fit to extensive popularization and application.
Internet of Things be one based on information-bearing bodies such as the Internet, conventional telecommunications nets, let all realized the network interconnect by the General Physics object of independent addressing.Internet of Things refers to ubiquitous end-equipment and facility; Realize interconnecting through various wireless or wired long distances or short distance communication network; Management and service functions such as the controlled and even personalized real time on-line monitoring of safety, location are reviewed, alarm linkage, dispatch control, program management, Long-distance Control, safety precaution, long-range repair and maintenance, online upgrading, statistical report form, decision support, leader's desktop are provided, realize that " pipe, control, the battalion " of efficient, energy-conservation, safety, environmental protection to equipment is integrated.Traditional Internet of Things is generally realized interconnecting through various wireless or wired communication networks, adopts traditional communication technology.
In the prior art, utilize the technology of Internet of things of visible light in the free space short-range communication, this Internet of Things of visible light communication technology that utilizes is referred to as the photon Internet of Things.The photon Internet of Things has the function of traditional Internet of Things, and just the mode of communication adopts visible light to communicate.Because visible light has the directive property height, can not penetrate characteristics such as barrier, therefore possess higher fail safe than wireless.The photon Internet of Things utilizes visible light to carry out short-range communication, and the directive property of visible light is high, can not penetrate barrier, has higher fail safe than the Internet of Things that uses communication.
But the photon technology of Internet of things is not encrypted initial data at present, transmits but directly modulate the signal on the visible light signal.Or transmitting terminal and receiving terminal only adopt fixing time-independent coded signal (like pseudo-code sequence) to encrypt; So just might there be a potential safety hazard; As use high-speed camera to take, just can copy the light signal of same stroboscopic, because the used pseudo-code sequence of receiving terminal decoding is fixed; So it is close that the light signal that duplicates also can be received end identification and carry out correct Solution, loses meaning thereby make to encrypt.
[summary of the invention]
Technical problem to be solved by this invention provides a kind of visible light signal dispensing device based on the keying modulation, the fail safe and cheap, the easy realization of equipment cost that can improve the photon Internet of Things.
For solving the problems of the technologies described above, one embodiment of the invention provides a kind of visible light signal dispensing device based on the keying modulation, and this dispensing device comprises:
The encoder that is connected with pseudo-code generator with information source respectively with the unit interval variable condition; Keying modulator that is connected with encoder and the luminescence unit that is connected with keying modulator.
Optional, said information source is connected with said encoder and is connected with baseband signal and forms device.
Wherein, said keying modulator is amplitude-shift keying, frequency shift keying or phase shift keying.
Wherein, first contact of said amplitude-shift keying be connected with constant current source, the second contact ground connection.
Wherein, said encoder is frequency mixer or logical-arithmetic unit.
Wherein, said logical-arithmetic unit is a convolution decoder.
Wherein, said luminescence unit is the LED lamp.
Compared with prior art; Technique scheme has the following advantages: encoder is connected with information source with the pseudo-code generator that changes with the unit interval, so this coding can adopt changing pseudo-code signal with the unit interval primary signal of information source output being encrypted of pseudo-code generator output, owing to the visible light signal that transmits not is an original data signal; But the scrambler signal after encrypting; And this scrambler signal changed with the unit interval, was difficult for being cracked, thereby had improved the fail safe of photon Internet of Things.In addition, the keying modulator that is connected with encoder is accomplished by digital circuit, advantages such as it has, and conversion rate is fast, adjustment convenient test, volume are little, equipment reliable, and can reduce the cost of whole system.
[description of drawings]
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1, a kind of visible light signal dispensing device structural representation that the embodiment of the invention one provides based on the keying modulation;
Fig. 2 is the structural representation of the binary system amplitude-shift keying that provides of the embodiment of the invention one;
Fig. 3 is the comparison diagram of the modulated signal of the original data signal that provides of the embodiment of the invention one and output;
Fig. 4 is a kind of visible light signal dispensing device structural representation based on the keying modulation that the embodiment of the invention two provides.
[embodiment]
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making all other embodiment that obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
At first, it will be apparent to those skilled in the art that technical scheme of the present invention, briefly introduce in the face of the technology that the present invention adopted down in order to make:
In digital communication system, its connection object is the digital signal of binary system or multi-system normally, and the digital information from various digital terminal equipments is arranged; Digital coding information from the analog signal system is arranged, and the source of these information is referred to as information source.Some parameter of removing to modulate the rectangular pulse carrier wave with the binary system or the multi-system Serial No. of information source output; Then can Serial No. be mapped as corresponding signal waveform in channel; Contain abundant low frequency component in these signal waveforms, even DC component, be referred to as digital baseband signal.Information source need be passed through baseband signal and formed the digital baseband signal that device is mapped to source signal suitable Channel Transmission.The present invention divulges a secret in order to prevent that high-speed camera from taking the digital baseband signal that sends; The pseudo-code signal that employing changed with the unit interval carries out scrambling to digital baseband signal; Signal after the scrambling is adopted the mode of keying modulation, be loaded on the visible light signal and send.
Referring to Fig. 1, be a kind of visible light signal dispensing device structural representation that the embodiment of the invention one provides based on the keying modulation, this dispensing device comprises:
The encoder 103 that is connected with pseudo-code generator 102 with information source 101 respectively with the unit interval variable condition; Keying modulator 104 that is connected with encoder 103 and the luminescence unit 105 that is connected with keying modulator 104.
With the pseudo-code generator 102 of unit interval variable condition, be used to produce and export the pseudo-code signal that changes with the unit interval, this pseudo-code signal can be a string binary sequence.For example, T1 in the unit interval pseudo-code signal be 111010011101001110100; T2 is in the time, and pseudo-code signal can become 100011010100101010110.
The encoder 103 that is connected with pseudo-code generator 102 with information source 101 respectively is used to adopt the pseudo-code signal of pseudo-code generator 102 outputs that the original data signal of information source 101 outputs is encoded.This encoder 103 can be for frequency mixer, also can be logical-arithmetic unit.Be that convolution decoder in the logical-arithmetic unit is that example describes with encoder 103 below: suppose that original data signal is always 110001010111100000110.T1 in the unit interval pseudo-code signal be 111010011101001110100, then the process of pseudo-code generator 102 coding is as shown in table 1:
| Original data signal | ?1 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 |
| Pseudo-code signal | ?1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 0 |
| The scrambler signal | ?0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 0 |
Logical operation process table in the table 1 T1 unit interval
Can know that from table 1 the scrambler signal of the output after the logical operation is 001011001010101110010, and is inequality with original data signal, initial data has been played the effect of encrypting.
After the Preset Time section of being separated by, suppose that the residing time period is T2, because pseudo-code signal changed with the unit interval; So at T2 in the time; Suppose that pseudo-code signal can become 100011010100101010110, and original data signal is invariable, then the process of its coding is as shown in table 2:
| Original data signal | ?1 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 |
| First pseudo-code signal | ?1 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 |
| The scrambler signal | ?0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
Logical operation process table in the table 2T2 unit interval
Can know that from table 2 the scrambler signal of logical operation is 010010000011001010000 in the T2 time, and is also inequality with original data signal, and also different with the scrambler signal of T1 in the time.
The keying modulator 104 that is connected with encoder 103 is used for the scrambler signal of encoder 103 outputs is modulated.Concrete, keying modulator 104 utilizes the centrifugal pump characteristics of digital signal to go keyed carrier to realize digital modulation.Keying modulator 104 can be amplitude-shift keying (ASK), frequency shift keying (FSK) or phase shift keying (PSK and DPSK).Keying modulator 104 also can be subdivided into binary system amplitude-shift keying (2ASK), Binary Frequency Shift Keying (2FSK) or binary phase shift keying (2PSK and 2DPSK).Present embodiment is that binary system amplitude-shift keying (2ASK) is illustrated with keying modulator 104.
As shown in Figure 2, be the structural representation of the binary system amplitude-shift keying that provides of the embodiment of the invention one.This binary system amplitude-shift keying comprises first contact 202 that is connected with constant current source 201, second contact 203 that is used for ground connection.Suppose that original data signal is 100100110100101101, carry out digital logical operation through the pseudo-code sequence that is produced with pseudo-code generator after, generate the binary digital signal stream after a string encryption.And carrier signal is a constant current signal, and its magnitude of voltage can carry out luminous in driven for emitting lights unit 105.Binary system amplitude-shift keying can be made up of digital integrated circuit, and digital switch circuit is wherein arranged, and constant current source 201 is input to 202, the second contacts, first contact, 203 ground connection, and its magnitude of voltage is 0.When the numeral of input is " 1 "; The digital switch of binary system amplitude-shift keying will push first contact 202, and the modulated signal of its output is the same with the constant current signal of constant current source 201 output, and its voltage can driven for emitting lights unit 105; At this moment luminescence unit 105, and is luminous like the LED lamp.When the original data signal of input is " 0 ", the digital switch of binary system amplitude-shift keying will push second contact 203, and the magnitude of voltage of the modulated signal of its output is 0, and at this moment luminescence unit 105 is not luminous.When a string binary digital signal is input to binary system amplitude-shift keying continuously; Digital switch just constantly fiddles with between first contact 202 and second contact 203; Thereby the modulated signal that makes output is along with input signal is done identical variation, and LED will one bright one goes out like this does not stop the variation of glimmering, thereby the information of carrying is sent; The input speed of original data signal is different, and the flicker frequency of LED is also just different.The comparison diagram of the modulated signal e (t) of the original data signal s (t) of input and output is as shown in Figure 3.
The visible light dispensing device of modulating through the described use keying of present embodiment; Not only can encrypt communication data; Preventing that high-speed camera from taking duplicates the strobe light signal, and employed digital modulation circuit is more simple with respect to pulse signal generator, and have that conversion rate is fast, advantages such as adjustment convenient test, volume are little, equipment reliable; Certain function has been played in fail safe to improving whole system, can also reduce the cost of whole system.
Referring to Fig. 4; It is a kind of visible light signal dispensing device structural representation that the embodiment of the invention two provides based on the keying modulation; With respect to embodiment one; Be connected with baseband signal between this dispensing device information source 101 and the encoder 103 and form device 301, be used for the original data signal of information source 101 outputs is formed digital baseband signal.Concrete, information source 101 forms device 301 through baseband signal and Serial No. is mapped to the digital baseband signal that is fit to Channel Transmission.
More than the embodiment of the invention has been carried out detailed introduction, used concrete example among this paper principle of the present invention and execution mode set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. visible light signal dispensing device based on keying modulation is characterized in that said dispensing device comprises:
The encoder that is connected with pseudo-code generator with information source respectively with the unit interval variable condition; Keying modulator that is connected with encoder and the luminescence unit that is connected with keying modulator.
2. dispensing device according to claim 1 is characterized in that, said information source is connected with said encoder and is connected with baseband signal and forms device.
3. dispensing device according to claim 1 is characterized in that, said keying modulator is amplitude-shift keying.
4. dispensing device according to claim 3 is characterized in that, first contact of said amplitude-shift keying is connected with constant current source, the second contact ground connection.
5. dispensing device according to claim 1 is characterized in that, said keying modulator is a frequency shift keying.
6. dispensing device according to claim 1 is characterized in that, said keying modulator is a phase shift keying.
7. dispensing device according to claim 1 is characterized in that, said encoder is a frequency mixer.
8. dispensing device according to claim 1 is characterized in that, said encoder is a logical-arithmetic unit.
9. dispensing device according to claim 8 is characterized in that, said logical-arithmetic unit is a convolution decoder.
10. dispensing device according to claim 1 is characterized in that, said luminescence unit is the LED lamp.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102916749A (en) * | 2012-10-18 | 2013-02-06 | 陈思源 | Light communication transmitting and receiving system |
| CN105075151A (en) * | 2013-02-22 | 2015-11-18 | 高通股份有限公司 | Method and apparatus for power-efficient joint dimming and visible light communication |
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| CN1933369A (en) * | 2005-09-13 | 2007-03-21 | 株式会社东芝 | Visible light communication system and method therefor |
| CN101502013A (en) * | 2006-10-23 | 2009-08-05 | 松下电器产业株式会社 | Optical space transmission system using visible light and infrared light |
| CN102307063A (en) * | 2011-09-23 | 2012-01-04 | 天津工业大学 | Voice information notification system based on LED visible light |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1933369A (en) * | 2005-09-13 | 2007-03-21 | 株式会社东芝 | Visible light communication system and method therefor |
| CN101502013A (en) * | 2006-10-23 | 2009-08-05 | 松下电器产业株式会社 | Optical space transmission system using visible light and infrared light |
| CN102307063A (en) * | 2011-09-23 | 2012-01-04 | 天津工业大学 | Voice information notification system based on LED visible light |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916749A (en) * | 2012-10-18 | 2013-02-06 | 陈思源 | Light communication transmitting and receiving system |
| CN105075151A (en) * | 2013-02-22 | 2015-11-18 | 高通股份有限公司 | Method and apparatus for power-efficient joint dimming and visible light communication |
| US9979475B2 (en) | 2013-02-22 | 2018-05-22 | Qualcomm Incorporated | Method and apparatus for power-efficient joint dimming and visible light communication |
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Owner name: SHENZHEN GUANGQI INTELLIGENT PHOTONICS TECHNOLOGY Free format text: FORMER OWNER: SHENZHEN KUANG-CHI INNOVATION TECHNOLOGY CO., LTD. Effective date: 20150826 |
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Application publication date: 20121010 |