CN102882600A - Universal serial bus (USB)-interface-based pluggable visible like wireless access system - Google Patents
Universal serial bus (USB)-interface-based pluggable visible like wireless access system Download PDFInfo
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- CN102882600A CN102882600A CN2012103385469A CN201210338546A CN102882600A CN 102882600 A CN102882600 A CN 102882600A CN 2012103385469 A CN2012103385469 A CN 2012103385469A CN 201210338546 A CN201210338546 A CN 201210338546A CN 102882600 A CN102882600 A CN 102882600A
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Abstract
The invention discloses a universal serial bus (USB)-interface-based pluggable visible like wireless access system, which comprises a first USB interface, a first level conversion circuit, a transmitter, a receiver, a second level conversion circuit and a second USB interface, wherein each level conversion circuit comprises an interface circuit and an impulse processing circuit; the transmitter comprises a voltage follower and a light-emitting diode (LED) device; and the receiver comprises a photoelectric detector, an amplification circuit and a decision device. According to the USB-interface-based pluggable visible like wireless access system, the duplex transmission of a high-speed digital signal can be supported to realize electromagnetic interference-free high-capacity short-distance wireless communication.
Description
Technical field
The present invention relates to USB interface-based hot plug visible light wireless access system, belong to the technical field of radio communication.
Background technology
Wireless access is being brought into play very important effect as a kind of important means of communication in the modern communications field always, and wireless access technology becomes the key issue in the radio communication.Traditional wireless access way need to take frequency spectrum resource day by day in short supply, and transmission rate is limited, and exists electromagnetic interference.Yet the develop rapidly of optical communication and Primary Component thereof utilizes the advantages such as the two-forty of light carrier frequency, large capacity, wide bandwidth to realize the high-speed transfer of large capacity digital signal so that visible light communication becomes global study hotspot.
The visible light communication technology is that the high speed light and shade flash signal that is invisible to the naked eye of utilizing fluorescent lamp or light-emitting diode etc. to send is come transmission information, and the wire device of high-speed Internet is connected on the lighting device, inserts attaching plug and can use.The system that utilizes this technology to make can cover the scope that indoor light reaches, and computer does not need electric wire to connect, thereby has widely DEVELOPMENT PROSPECT.Use USB interface that the visible light communication technology is attached to the concern that application study on the computer just more and more is subject to scholars.
Summary of the invention
Technical problem to be solved by this invention has provided USB interface-based hot plug visible light wireless access system, has not been subjected to electromagnetic interference, can provide large capacity, at a high speed, short-range visible light wireless access system.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
USB interface-based hot plug visible light wireless access system comprises the first USB interface, the first level shifting circuit, transmitting terminal, receiving terminal, second electrical level change-over circuit, secondary USB interface, wherein:
Described the first USB interface is connected with the input of the first level shifting circuit, and the output of described the first level shifting circuit is connected with transmitting terminal;
Described receiving terminal is connected with the input of second electrical level change-over circuit, and the output of described second electrical level change-over circuit is connected with secondary USB interface.
In the described USB interface-based hot plug visible light wireless access system, the first level shifting circuit comprises: the usb circuit, the pulse moder that connect successively.
In the described USB interface-based hot plug visible light wireless access system, the second electrical level change-over circuit comprises: the pulse decoding circuit, the usb circuit that connect successively.
In the described USB interface-based hot plug visible light wireless access system, receiving terminal also comprises optical filtering, condenser; Wherein:
Described optical filtering is used for that the light that transmitter module LED device sends is carried out filtering to be processed;
Described condenser is used for focusing on through the light that filtering is processed the sensitization part of photoelectric detector.
In the described USB interface-based hot plug visible light wireless access system, the LED device is white light LED part.
The present invention adopts above technical scheme compared with prior art, has following technique effect: utilize USB interface to realize that visible light wireless access system is as terminal accessing WLAN or Wireless Personal Network, obtain operating voltage by USB simultaneously, simplified circuit design; Support the duplex transmission of high-speed digital signal, realize not being subjected to the large capacity short-distance wireless communication of electromagnetic interference.
Description of drawings
Fig. 1 is the general frame figure of the designed USB interface-based hot plug visible light radio access module of the present invention.
Fig. 2 is the circuit diagram of level switch module in the designed USB interface-based hot plug visible light radio access module of the present invention.
Fig. 3 is transmitting terminal circuit diagram in the designed USB interface-based hot plug visible light radio access module of the present invention.
Fig. 4 is receiving terminal circuit figure in the designed USB interface-based hot plug visible light radio access module of the present invention.
Fig. 5 is the circuit diagram of transceiving data indicator light.
Fig. 6 is the whole pictorial diagram of the designed USB interface-based hot plug visible light radio access module of the present invention.
The number in the figure explanation: U1 is the USB interface chip, U2 is the CH430T chip, U3, U4 are the OPA354 chip, and U5 is the LT1715 chip, and P1 is the output port of receiving terminal, C1 to C10 is the first to the tenth electric capacity, R1 to R14 is the first to the 14 resistance, and D1, D2 are first, second diode, and Y1 is crystal oscillator, L1 to L4 is first to fourth light-emitting diode, and PD1 is photodiode.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in further detail:
USB interface-based hot plug visible light wireless access system as shown in Figure 1 comprises the first USB interface, the first level shifting circuit, transmitting terminal, receiving terminal, second electrical level change-over circuit, secondary USB interface.The first USB interface is connected with the input of the first level shifting circuit, and the output of described the first level shifting circuit is connected with transmitting terminal.Receiving terminal is connected with the input of second electrical level change-over circuit, and the output of described second electrical level change-over circuit is connected with secondary USB interface.Transmitting terminal comprises voltage follower, the LED device that is linked in sequence, and receiving terminal comprises photoelectric detector, amplifier, the decision circuit that is linked in sequence.
The first level shifting circuit comprises: the usb circuit, the pulse moder that connect successively.The second electrical level change-over circuit comprises: the pulse decoding circuit, the usb circuit that connect successively.
In the first level shifting circuit: the first USB interface is used for receiving the serial bus signal of the digital device generations such as exterior PC; Interface circuit carries out level conversion with serial bus signal, and being flatted turn by serial port power turns to Transistor-Transistor Logic level, and transfers to pulse moder; Pulse moder is used for the TTL signal is carried out pulse code modulation, and the signal after will modulating is sent into voltage follower.
In the second electrical level change-over circuit: the pulse decoding circuit carries out the pulse code demodulation with the signal of decision device output, recovers the Transistor-Transistor Logic level signal of original transmitted; Interface circuit is converted to the Transistor-Transistor Logic level signal serial bus signal that is fit to the USB transmission.
First, second level shifting circuit as shown in Figure 2, the conversion of the first level conversion, second electrical level all realizes by U2.U1 is the USB interface chip, and U2 is level transferring chip CH430T.Power to U2 behind first, second diode of voltage process D1, the D2 of the output of U1 USB interface, the D+ pin of U1, D-pin connect D+ pin, the D-pin of U2, the second capacitor C 2, the 3rd capacitor C 3 and crystal oscillator electric capacity Y1 form the crystal oscillating circuit of U2, ground connection after the first capacitor C 1 is connected with the V3 pin of U2, the output voltage of U1 are connected with the U2 power end after through the 4th capacitor C 4, the 5th capacitor C 5.
In the transmitting terminal: voltage follower adopts operational amplifier and resistance to carry out negative feedback, in the situation that do not change signal voltage, the electric current of amplifying signal is luminous with the driving LED device, and the luminous brightness of LED device changes with the power of drive current.The LED device is used for converting the electrical signal to light signal, and the mode by wireless transmission with optical signal transmission to photodetector.U3 is amplifier chip OPA354, and the function that U3 realizes is in the situation that do not change the current value that signal voltage value amplifies transmitted signal.As shown in Figure 3, the 2nd pin of U3 connects with the 6th pin, the 4th pin ground connection, and the 6th pin connects ground connection behind the 4th resistance R 4, the 4th light-emitting diode L4, and the 5th resistance R 5, the 6th capacitor C 6 are all and be connected in the two ends of the 4th light-emitting diode L4.
In the receiving terminal, photodetector is used for receiving optical signals, and transfers to amplifier after light signal is converted to the signal of telecommunication; Amplifier is used for that the signal of telecommunication is carried out voltage amplification and electric current amplifies, and makes the satisfied judgement of the level value requirement of the signal of telecommunication after amplifying.In specific embodiment, the Trans-impedance preamplifier of amplifier for being consisted of by chip U4, the 9th resistance R 9, the tenth resistance R 10, the 11 resistance R 11, the tenth capacitor C 10, Trans-impedance preamplifier is finished the function of wide-band amplifier simultaneously, Trans-impedance preamplifier has higher gain, when being high-frequency signal, input signal can effectively reduce front-end noise, keep higher sensitivity, reduce owing to amplifying the wrong code element number that produces; Wide-band amplifier has uniform gain amplifier in wider frequency range, be used for the signal of Trans-impedance preamplifier output is carried out the broadband amplification.The decision device module is made of chip U5, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, and for judgement that the level value that receives the signal of telecommunication is sampled, and the signal after will adjudicating transfers to the pulse decoding circuit.As shown in Figure 4, U4 is amplifier chip OPA354, and the function of realization is that the low current signal after the PD opto-electronic conversion is carried out the preposition resistance amplification of striding; U5 is comparator chip LT1715, and the signal that receives is adjudicated, and recovers original transmitted signal; P1 is the output port of receiving terminal, the output Transistor-Transistor Logic level.The anode of photodiode PD1 connects the 7th capacitor C 7 rear ground connection, and a utmost point of the negative electrode of photodiode PD1, the 9th capacitor C 9 is connected with an end of the 6th resistance R 6 respectively; Another utmost point of one end of the 7th resistance R 7, the 9th capacitor C 9, the other end of the 7th resistance R 7 are connected with an end of the 8th resistance R 8 respectively; The other end of the 8th resistance R 8 is connected with No. 2 pins of U4, and the 8th resistance R 8 is connected in series the 9th resistance R 9, the tenth resistance R 10, the tenth capacitor C 10 rear ground connection; No. 7 pins of U4 are connected with the VCC direct voltage source; One end ground connection of the 11 resistance R 11, No. 1 pin of another termination U5; The 12 resistance R 12 is connected across between No. 1, No. 10 pins of U5; No. 9 pins of R5, No. 10 pins are connected with the positive pole of the 8th capacitor C 8 respectively; No. 8 pins of one termination U5 of the 13 resistance R 13, an end of the other end and the 14 resistance R 14, No. 4 pins of P1; The other end of the 6th resistance R 6, an end of the 7th resistance R 7, the negative pole of the 8th capacitor C 8, the other end of the 14 resistance R 14, No. 3 pins of U4, No. 4 pins, No. 2, No. 5 pins of U5, No. 3 pin ground connection of P1.
Secondary USB interface is used for receiving above-mentioned universal serial bus level signal, and is carried out the operation such as reading of next step by digital devices such as PC.
As further prioritization scheme: reach better effect in order to make photodetector, can arrange at the input of photodetector and filter and light collecting device, the light that the LED device is sent is through focusing on the sensitization part of photodetector after the filtering, thereby improves the sensitivity of photodetector;
As further prioritization scheme: the LED device adopts white light LED part, can be in illumination high-speed response.
Transceiving data indicating circuit as shown in Figure 5: the series arm that the first resistance R 1, the first light-emitting diode L1 form, the series arm that the second resistance R 2, the second Light-Emitting Diode L2 form, the series arm that the 3rd resistance R 3, the 3rd Light-Emitting Diode L3 form is connected in parallel; Each series arm is powered by direct voltage source, the minus earth of Light-Emitting Diode.During transmitting terminal work, the second Light-Emitting Diode L2 is bright; During receiving terminal work, the 3rd Light-Emitting Diode L3 is bright.
As shown in Figure 6, in actual applications, transmitting terminal and receiving terminal all are encapsulated in the housing, transmitting terminal, receiving terminal by the interface on the housing with connect USB interface after level shifting circuit is connected.According to demand, when visible light wireless access system received the information that PC sends, USB interface, level shifting circuit, transmitting terminal consisted of the transmitting terminal of visible light wireless access system; When visible light wireless access system received the information that the LED device sends, receiving terminal, level shifting circuit, USB interface consisted of the receiving terminal of visible light wireless access system, realize duplex communication.
In sum, the present invention utilizes USB interface to realize that visible light wireless access system as terminal accessing WLAN or Wireless Personal Network, obtains operating voltage by USB simultaneously, has simplified circuit design; Support the duplex transmission of high-speed digital signal, realize not being subjected to the large capacity short-distance wireless communication of electromagnetic interference.Above-described embodiment is a specific embodiment of the present invention, and every embodiment of this patent invention aim that meets is all within protection scope of the present invention.
Claims (5)
1. USB interface-based hot plug visible light wireless access system is characterized in that: comprise the first USB interface, the first level shifting circuit, transmitting terminal, receiving terminal, second electrical level change-over circuit, secondary USB interface, wherein:
Described the first USB interface is connected with the input of the first level shifting circuit, and the output of described the first level shifting circuit is connected with transmitting terminal;
Described receiving terminal is connected with the input of second electrical level change-over circuit, and the output of described second electrical level change-over circuit is connected with secondary USB interface.
2. USB interface-based hot plug visible light wireless access system according to claim 1, it is characterized in that: described the first level shifting circuit comprises: the usb circuit, the pulse moder that connect successively.
3. USB interface-based hot plug visible light wireless access system according to claim 1, it is characterized in that: described second electrical level change-over circuit comprises: the pulse decoding circuit, the usb circuit that connect successively.
4. USB interface-based hot plug visible light wireless access system according to claim 1 is characterized in that described receiving terminal also comprises optical filtering, condenser; Wherein:
Described optical filtering is used for that the light that transmitter module LED device sends is carried out filtering to be processed;
Described condenser is used for focusing on through the light that filtering is processed the sensitization part of photoelectric detector.
5. USB interface-based hot plug visible light wireless access system according to claim 1 is characterized in that described LED device is white light LED part.
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| CN2012103385469A CN102882600A (en) | 2012-09-14 | 2012-09-14 | Universal serial bus (USB)-interface-based pluggable visible like wireless access system |
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| CN2012103385469A CN102882600A (en) | 2012-09-14 | 2012-09-14 | Universal serial bus (USB)-interface-based pluggable visible like wireless access system |
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Cited By (13)
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| CN103220041A (en) * | 2013-04-22 | 2013-07-24 | 南京邮电大学 | Wireless router access system based on visible light |
| CN103338073A (en) * | 2013-06-06 | 2013-10-02 | 南京邮电大学 | Communication module capable of realizing network access by using visible light and communication system |
| CN103338072A (en) * | 2013-06-04 | 2013-10-02 | 南京邮电大学 | A visible light communication and wireless access method base on the Android system |
| CN103490814A (en) * | 2013-09-25 | 2014-01-01 | 上海理工大学 | Serial communication device of USB interface LED visible light and system thereof |
| CN103763031A (en) * | 2014-01-27 | 2014-04-30 | 惠州Tcl移动通信有限公司 | Communication terminal and communication system achieving communication through visible light |
| CN104301043A (en) * | 2014-10-23 | 2015-01-21 | 中国科学院半导体研究所 | Optical communication receiving system and method based on OTG |
| CN104485995A (en) * | 2014-12-15 | 2015-04-01 | 昆山国显光电有限公司 | Light fidelity access device |
| CN104734785A (en) * | 2015-01-26 | 2015-06-24 | 华北水利水电大学 | Visible light receiving device and method |
| CN105119654A (en) * | 2015-08-26 | 2015-12-02 | 南京邮电大学 | Blue light underwater sensing system based on visible light communication |
| CN105245276A (en) * | 2015-09-14 | 2016-01-13 | 中国人民解放军信息工程大学 | Visible light communication technology-based transmission apparatus and system |
| CN105323003A (en) * | 2014-06-10 | 2016-02-10 | 深圳市达特照明股份有限公司 | Optical communication system and optical communication method |
| CN105897335A (en) * | 2016-06-02 | 2016-08-24 | 复旦大学 | USB interface communication handheld transmitting and receiving device based on visible light communication technology |
| CN111049580A (en) * | 2019-11-29 | 2020-04-21 | 维沃移动通信有限公司 | Electronic equipment and data transmission system |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103220041A (en) * | 2013-04-22 | 2013-07-24 | 南京邮电大学 | Wireless router access system based on visible light |
| CN103338072B (en) * | 2013-06-04 | 2016-04-13 | 南京邮电大学 | Based on visible light communication and the radio switch-in method of android system |
| CN103338072A (en) * | 2013-06-04 | 2013-10-02 | 南京邮电大学 | A visible light communication and wireless access method base on the Android system |
| CN103338073A (en) * | 2013-06-06 | 2013-10-02 | 南京邮电大学 | Communication module capable of realizing network access by using visible light and communication system |
| CN103490814A (en) * | 2013-09-25 | 2014-01-01 | 上海理工大学 | Serial communication device of USB interface LED visible light and system thereof |
| CN103763031A (en) * | 2014-01-27 | 2014-04-30 | 惠州Tcl移动通信有限公司 | Communication terminal and communication system achieving communication through visible light |
| US9577754B2 (en) | 2014-01-27 | 2017-02-21 | Huizhou Tcl Mobile Communication Co., Ltd. | Nonradiative communication terminal and communication system using visible light for communication |
| CN105323003A (en) * | 2014-06-10 | 2016-02-10 | 深圳市达特照明股份有限公司 | Optical communication system and optical communication method |
| CN104301043A (en) * | 2014-10-23 | 2015-01-21 | 中国科学院半导体研究所 | Optical communication receiving system and method based on OTG |
| CN104485995A (en) * | 2014-12-15 | 2015-04-01 | 昆山国显光电有限公司 | Light fidelity access device |
| CN104734785A (en) * | 2015-01-26 | 2015-06-24 | 华北水利水电大学 | Visible light receiving device and method |
| CN105119654A (en) * | 2015-08-26 | 2015-12-02 | 南京邮电大学 | Blue light underwater sensing system based on visible light communication |
| CN105245276A (en) * | 2015-09-14 | 2016-01-13 | 中国人民解放军信息工程大学 | Visible light communication technology-based transmission apparatus and system |
| CN105245276B (en) * | 2015-09-14 | 2018-02-09 | 中国人民解放军信息工程大学 | A kind of transmission equipment and system based on visible light communication technology |
| CN105897335A (en) * | 2016-06-02 | 2016-08-24 | 复旦大学 | USB interface communication handheld transmitting and receiving device based on visible light communication technology |
| CN111049580A (en) * | 2019-11-29 | 2020-04-21 | 维沃移动通信有限公司 | Electronic equipment and data transmission system |
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Application publication date: 20130116 |