CN205490551U - Indoor LED visible light communication system - Google Patents
Indoor LED visible light communication system Download PDFInfo
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- CN205490551U CN205490551U CN201620184855.9U CN201620184855U CN205490551U CN 205490551 U CN205490551 U CN 205490551U CN 201620184855 U CN201620184855 U CN 201620184855U CN 205490551 U CN205490551 U CN 205490551U
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Abstract
The utility model discloses an indoor LED visible light communication system, include: bridge circuit for the linked computers USB interface carries out the signal of transform processing with light transceiver circuits, acceptance or transmission from computer USB data signal, the optical sender will pass through the signal encode modulation that USB interface circuit handled, and modulated light source is sent to again to the signal of making after enlargeing, optical receiver assembles photoelectric detector PIN to the smooth pulse signal that the transmitting terminal sent through the optical antenna, becomes the signal of telecommunication with the light signal conversion who receives. This system implementation point -to -point communication mode, receive, send out and all adopt receipt, launch angle less relatively, only need during the use manual thick alignment can, be applied to indoor short distance radio communication, can reach the data communication speed more than the 10Mbps, transmission distance reaches 5 meters left and right sides, satisfies the data communication requirement of indoor environments such as office, laboratory, family basically.
Description
Technical field
The present invention relates to technical field of visible light communication, especially a kind of indoor LED visible light is led to
Communication system.
Background technology
Visible light communication technology, is that the naked eyes utilizing fluorescent lamp or light emitting diode etc. to send are seen
Less than high speed light and shade flash signal transmit information, by the wire device of high-speed Internet
Being connected on illuminator, inserting attaching plug can use.This technology is utilized to make
System can cover the scope that indoor light reaches, and computer need not electric wire and connects, thus tool
There is DEVELOPMENT PROSPECT widely.Compared to other radio communication system, it is seen that the master of optic communication
The advantage is wanted to be:
(1) the linear directional circulation way of optic communication makes its narrow transmitting beam, good directionality,
The angle of divergence of light beam is usual all in milliradian, even microradian magnitude, therefore has data and passes
The confidentiality passed, unless its communication link is intercepted, otherwise data are difficult to leak.Due to this
A little wave beams very orient, and are in alignment with a certain receiver, as thought interposition, it is necessary to another
One receiver is directed at transmitter in sighting distance, in addition it is also necessary to knowing how to receive signal, this is
It is difficult to accomplish.If connect by sanction, then originally link is just interrupted, user will send out
Existing information is by interposition.
(2) need not carry out the pipeline engineering construction of costliness, its construction cost is about optical cable
20%.Networking is convenient, rapid, and optic communication networking speed is fast, need only carry out in communication point
Equipment is installed, and is suitable for interim use and the urgent networking in complicated landform, for again replacing
Dispose the most very convenient.
The well-illuminated property of agreement
(3) due to optical wavelength short (several microns of the about zero point of visible ray), so completing together
In the case of sample function, the size of light sending and receiving end is than microwave, the chi of millimeter wave communication antenna
Very little much smaller, there is the features such as power consumption is little, volume is little, lightweight, corresponding device cost
Relatively low.
Although optic communication has plurality of advantages, but there is also some drawbacks, such as: light wave
The barriers such as wall can not be penetrated, easily made an uproar by bias lights such as sunlight, electric filament lamp, fluorescent lamps
The interference etc. of sound.
Summary of the invention
The goal of the invention of the present invention is, overcomes the deficiency of art methods, it is provided that a kind of
Point-to-point communication mode, sending and receiving all use relatively small reception, launch angle, use
Time only need manual coarse alignment, be applied to indoor short-distance wireless communication, can reach
The data communication rates of more than 10Mbps, transmission range reaches about 5 meters, substantially meets and do
The indoor LED visible light of the data communication requirements of the indoor environments such as public room, laboratory, family
Communication system.
For achieving the above object, it is proposed that following technical scheme:
A kind of indoor LED visible light communication system, including:
Bridgt circuit: connect USB interface of computer and light transmission circuit, will be from computer
Usb data signal carries out conversion process and becomes to be suitable for the signal of radiating circuit modulation, will connect simultaneously
The signal that receipts circuit is sent here is changed being processed into usb data signal and gives computer, it is achieved
The wireless duplex communication of two-forty.
Optical sender: the signal processed through usb circuit is carried out coded modulation,
Modulated signal sends to modulated light source visible LED again after amplifying so that it is send out
Go out to be encoded the signal of telecommunication modulation visible ray light pulse signal (this process is referred to as electric light and turns
Change, i.e. E/O changes), after in optical antenna is transmitted into atmospheric channel.
Photoreceiver: by optical antenna, transmitting terminal is sent the light pulse signal come and converge to
Photoelectric detector PIN, the optical signal of reception is converted into the signal of telecommunication, and (this process is referred to as
Opto-electronic conversion, i.e. O/E changes), the ultra-weak electronic signal that conversion comes is after amplifying demodulation
Give usb circuit.
Described optical sender includes light source and driver and auxiliary circuit.Described auxiliary circuit
Including light detection device, without optical alarm circuit, automatic power control circuit (APC) and automatic temperature-adjusting
Control circuit (ATC)；During use, the signal of telecommunication is input to driver, described driver and light source
Connecting, automatic temp. controlling circuit regulation and control light-source temperature, described light detection device is arranged on light source
In range of exposures, and it is connected with without optical alarm circuit, described light detection device and an automated power
Control circuit constitutes feedback circuit with driver after connecting.
Described light source works wave band is HONGGUANG 650nm, compared with green glow and blue light, and HONGGUANG
In atmospheric channel during transmission, in the resistivity to the fluorescence in background noise and ultraviolet
On there is certain advantage.
Described transmitter circuitry use the red light-emitting diode (LED) of 650nm as sending out
Penetrate the light source of machine.For indoor portable radiotelephone optical transmission device, light source must is fulfilled for following
Several basic requirements: meet eye-safe requirement；Modulation rate satisfied design requirement (>=
10Mb/s)；Service life is long；Price is low, reduces cost.Described LED drive circuit is adopted
Use difference channel.
Described optical receiver circuit includes photodetector, amplifying circuit and signal processing circuit,
For the digital optical signal of intensity modulated, when receiving terminal uses direct detection mode, mainly
Constituted light by photoelectric detector, low noise preamplifier, main amplifier, agc circuit etc. to connect
The linear passageway of receipts machine, to complete optical electrical conversion, needed for signal is amplified to decision circuit
Signal level.
In optical communication system, the effect of receiver is to be changed into telecommunications receiving optical signal
Number.First (can be PIN photodiode, it is also possible to be PAD snowslide by photodetector
Photodiode) optical sender is sent channel transmission after faint optical signal be changed into
The signal of telecommunication.The output signal electric current of photodetector is the least, it is necessary to by low noise, broadband
Preamplifier be amplified.Before photodetector and preamplifier constitute photoreceiver
End, its noiseproof feature will be the main because of family of decision receiving sensitivity.Main amplifier, equilibrium
Device and agc circuit signal is carried out the amplification of high-gain and signal is compensated, shaping,
To improve signal to noise ratio, to reduce the bit error rate, the pulse of output is made to be suitable for the requirement of judgement.
Described low noise preamplifier is broadband, low-noise amplifier, because circuit work speed
Rate is higher, is preferably, and LNA uses trans-impedance amplifier.
This beneficial effect of the invention:
The indoor LED visible light communication system of the present invention mainly includes USB bridgt circuit, light
Transmitter and photoreceiver, hardware circuit is small and exquisite, easy to use, and service behaviour is good,
Support hot plug on computer, fully demonstrated USB interface device and used special quickly and easily
Point.Under the support of driver, realize point-to-point double-direction radio light between computer and lead to
Letter, traffic rate can reach 11Mbps, it is achieved that USB interface-based between computer can
See light (HONGGUANG) wireless points point to-point communication.This system is mainly applied to indoor short-range
In horizon range, use 650nm as operation wavelength, the visible light wave range in short wavelength
Installation and debugging can visually be directed at, eliminate infrared band and be worth expensive telescope pair
Barebone；And the optical device price of visible light wave range is only the tens of 850/1550nm device very
To more than one percent, greatly reduce system cost.LED light source drive circuit uses
Difference channel；Difference channel is due to the effect of constant-current source, even if big electric current drift occurs, and should
Kind of circuit is it is also ensured that metastable supply current, thus ensures the working stability of circuit
Property；Even if voltage drift phenomenon occurring during high voltage output, as long as signal remains in that balance,
The cross interference that this circuit causes is the most relatively small；For there is easy generation parasitism
In the case of front stage circuits, in view of this circuit common-mode gain is relatively low, so prime is introduced by it
The probability of unwanted oscillation is the least.
Accompanying drawing explanation
Fig. 1 is system architecture diagram；
Fig. 2 is optical transmitter circuit block diagram；
Fig. 3 is LED light source drive circuit；
Fig. 4 is that light receives machine circuit block diagram；
Fig. 5 is trans-impedance amplifier circuit diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings the 11 of the present invention are further described in detail:
As it is shown in figure 1, a kind of indoor LED visible light communication system, including:
Bridgt circuit: connect USB interface of computer and light transmission circuit, will be from computer
Usb data signal carries out conversion process and becomes to be suitable for the signal of radiating circuit modulation, will connect simultaneously
The signal that receipts circuit is sent here is changed being processed into usb data signal and gives computer, it is achieved
The wireless duplex communication of two-forty.
Optical sender: the signal processed through usb circuit is carried out coded modulation,
Modulated signal sends to modulated light source visible LED again after amplifying so that it is send out
Go out to be encoded the signal of telecommunication modulation visible ray light pulse signal (this process is referred to as electric light and turns
Change, i.e. E/O changes), after in optical antenna is transmitted into atmospheric channel.
Photoreceiver: by optical antenna, transmitting terminal is sent the light pulse signal come and converge to
Photoelectric detector PIN, the optical signal of reception is converted into the signal of telecommunication, and (this process is referred to as
Opto-electronic conversion, i.e. O/E changes), the ultra-weak electronic signal that conversion comes is after amplifying demodulation
Give usb circuit.
As in figure 2 it is shown, described optical sender includes light source and driver and auxiliary circuit.
Described auxiliary circuit includes light detection device, without optical alarm circuit, automatic power control circuit
And automatic temp. controlling circuit (ATC) (APC)；During use, the signal of telecommunication is input to driver,
Described driver is connected with light source, automatic temp. controlling circuit regulation and control light-source temperature, described light
Monitor is arranged in light source range of exposures, and is connected with without optical alarm circuit, and described light is supervised
Feedback circuit is constituted with driver after surveying device and automatic power control circuit connection.
Preferably, described light source works wave band is HONGGUANG 650nm, compared with green glow and blue light
Relatively, when HONGGUANG is transmitted in atmospheric channel, to the fluorescence in background noise and ultraviolet
There is in resistivity certain advantage.
Preferably, described transmitter circuitry uses the red light-emitting diode (LED) of 650nm
Light source as transmitter.For indoor portable radiotelephone optical transmission device, light source must be expired
The following basic requirement of foot: meet eye-safe requirement；Modulation rate meets design and wants
Ask (>=10Mb/s)；Service life is long；Price is low, reduces cost.As it is shown on figure 3,
Described LED drive circuit uses difference channel.
As shown in Figure 4, described optical receiver circuit include photodetector, amplifying circuit and
Signal processing circuit, for the digital optical signal of intensity modulated, uses directly inspection at receiving terminal
During survey mode, mainly by photoelectric detector, low noise preamplifier, main amplifier, AGC
Circuit etc. constitute the linear passageway of photoreceiver, to complete optical electrical conversion, signal are amplified to
Signal level needed for decision circuit.
In optical communication system, the effect of receiver is to be changed into telecommunications receiving optical signal
Number.First (can be PIN photodiode, it is also possible to be PAD snowslide by photodetector
Photodiode) optical sender is sent channel transmission after faint optical signal be changed into
The signal of telecommunication.The output signal electric current of photodetector is the least, it is necessary to by low noise, broadband
Preamplifier be amplified.Before photodetector and preamplifier constitute photoreceiver
End, its noiseproof feature will be the main because of family of decision receiving sensitivity.Main amplifier, equilibrium
Device and agc circuit signal is carried out the amplification of high-gain and signal is compensated, shaping,
To improve signal to noise ratio, to reduce the bit error rate, the pulse of output is made to be suitable for the requirement of judgement.
Described low noise preamplifier is broadband, low-noise amplifier, because circuit work speed
Rate is higher, is preferably, and LNA uses trans-impedance amplifier.
As it is shown in figure 5, wherein, Iin is the photogenerated current of photodetector, and Ay is preferable amplification
Device.Negative feedback network Rf therein detects output end voltage and feeds back in the form of electric current
To input.On the one hand the amplifier of this form ensure that it has less input impedance,
Such that it is able to the photoelectric current that picked-up photodetector in amplitude peak ground produces；On the other hand, tool
There is good load-carrying ability.It is that a kind of feedback resistance Rf of passing through inputs to amplifier
End provides degenerative high-gain high-impedance amplifier, substantially one current-voltage conversion
Device, noise is low, bandwidth and dynamic range big.
Claims (7)
1. an indoor LED visible light communication system, it is characterised in that including:
Bridgt circuit, for connecting USB interface of computer and light transmission circuit, become to be suitable for the signal of radiating circuit modulation by carrying out conversion process from computer usb data signal, the signal that reception circuit is sent here is changed being processed into usb data signal simultaneously and gives computer；
Optical sender, signal for processing through usb circuit carries out coded modulation, modulated signal sends to modulated light source again after amplifying so that it is send the visible ray light pulse signal being encoded signal of telecommunication modulation, after in optical antenna is transmitted into atmospheric channel；
Photoreceiver, sends, transmitting terminal, the light pulse signal come by optical antenna and converges to photoelectric detector PIN, and the optical signal of reception is converted into the signal of telecommunication, and the ultra-weak electronic signal that conversion comes gives usb circuit after amplifying demodulation；
Described optical sender includes light source and driver and auxiliary circuit；Described auxiliary circuit includes light detection device, without optical alarm circuit, automatic power control circuit and automatic temp. controlling circuit；During use, the signal of telecommunication is input to driver, described driver is connected with light source, automatic temp. controlling circuit regulation and control light-source temperature, described light detection device is arranged in light source range of exposures, and be connected with without optical alarm circuit, described light detection device and an automatic power control circuit constitute feedback circuit with driver after connecting；
Described optical receiver circuit includes that photodetector, amplifying circuit and signal processing circuit, described signal processing circuit include low noise preamplifier, main amplifier, equalizer, agc circuit；During use, photoelectric detector uses direct detection mode to receive optical signal at receiving terminal, low noise preamplifier, main amplifier, equalizer constitute the linear passageway of photoreceiver, agc circuit connects between main amplifier and equalizer, complete optical electrical conversion, the signal level needed for optical signal amplification to judgement regenerative circuit.
A kind of indoor LED visible light communication system the most according to claim 1, it is characterised in that described photodetector is PIN photodiode or PAD avalanche photodide；Faint optical signal after the channel transmission sent by optical sender is changed into the signal of telecommunication.
A kind of indoor LED visible light communication system the most according to claim 1, it is characterised in that described light source works wave band is HONGGUANG 650nm.
A kind of indoor LED visible light communication system the most according to claim 3, it is characterised in that use the red light-emitting diode (LED) light source as transmitter of 650nm in described transmitter circuitry.
A kind of indoor LED visible light communication system the most according to claim 4, it is characterised in that described LED drive circuit uses difference channel.
A kind of indoor LED visible light communication system the most according to claim 1, it is characterised in that described low noise preamplifier is broadband, low-noise amplifier.
A kind of indoor LED visible light communication system the most according to claim 6, it is characterised in that
Described low noise preamplifier is trans-impedance amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620184855.9U CN205490551U (en) | 2016-03-10 | 2016-03-10 | Indoor LED visible light communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620184855.9U CN205490551U (en) | 2016-03-10 | 2016-03-10 | Indoor LED visible light communication system |
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| Publication Number | Publication Date |
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| CN205490551U true CN205490551U (en) | 2016-08-17 |
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ID=56655895
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620184855.9U Expired - Fee Related CN205490551U (en) | 2016-03-10 | 2016-03-10 | Indoor LED visible light communication system |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827309A (en) * | 2016-03-10 | 2016-08-03 | 文成县刀锋科技有限公司 | Indoor LED visible light communication system |
| CN106375007A (en) * | 2016-09-12 | 2017-02-01 | 美的智慧家居科技有限公司 | Visible light communication-based device and method for LED light source |
| CN106911385A (en) * | 2017-02-28 | 2017-06-30 | 华南师范大学 | A kind of optical antenna and LED visible light communication system |
-
2016
- 2016-03-10 CN CN201620184855.9U patent/CN205490551U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827309A (en) * | 2016-03-10 | 2016-08-03 | 文成县刀锋科技有限公司 | Indoor LED visible light communication system |
| CN106375007A (en) * | 2016-09-12 | 2017-02-01 | 美的智慧家居科技有限公司 | Visible light communication-based device and method for LED light source |
| CN106911385A (en) * | 2017-02-28 | 2017-06-30 | 华南师范大学 | A kind of optical antenna and LED visible light communication system |
| CN106911385B (en) * | 2017-02-28 | 2019-06-21 | 华南师范大学 | A kind of optical antenna and LED visible light communication system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20170310 |