CN109327259A - Dual-detector visible light communication noise reduction method and system - Google Patents
Dual-detector visible light communication noise reduction method and system Download PDFInfo
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- CN109327259A CN109327259A CN201811360932.1A CN201811360932A CN109327259A CN 109327259 A CN109327259 A CN 109327259A CN 201811360932 A CN201811360932 A CN 201811360932A CN 109327259 A CN109327259 A CN 109327259A
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- amplifying circuit
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- 238000004891 communication Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 230000003321 amplification Effects 0.000 claims abstract description 17
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 230000005855 radiation Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 2
- 230000005764 inhibitory process Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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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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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention relates to a method and a system for reducing noise of double-detector visible light communication, wherein the system comprises a main auxiliary detector, a transimpedance amplification circuit and a high common-mode rejection ratio operational amplification circuit; the main detector is used for receiving the optical information with the target information and the optical information with the interference information, and the auxiliary detector is used for receiving only the optical information with the interference information; the detector respectively carries out photoelectric conversion on the received optical information and respectively outputs photoproduction current signals; converting the two paths of photo-generated current signals into voltage signals respectively and then amplifying the voltage signals; eliminating interference signals with interference information which coexist in the two paths of signals; a signal with target information is received. The problem that the main signal receiving is influenced by various frequency modulation lights in the light environment where the receiving end is located is solved, and a solution is provided for visible light communication under the condition that visible light signals modulated by different frequencies are overlapped in the same area range. The method is suitable for various scenes, namely scenes with near and far high-speed and low-speed optical signals.
Description
Technical field
The present invention relates to a kind of double detector visible light communication noise-reduction method and system, the espespecially communications of visible light spectrum.
Background technique
Radio Spectrum Resource is abnormal crowded, expands visible light frequency band, realizes wireless optical using ubiquitous LED
Communication, is strategic development demand.
The visible light communication of OOK modulation system at present is surfed the Internet in LIFI household, and the scene of family multi-media transmission can reach
100Mbps transmission rate.But also need to control electrical equipment in many scenes, the demand of monitoring device etc., these controls only need
One relatively low speed carries out instruction and sends and receives.Tens, several hundred Kbps low speed receiving modules are in cost,
All far below the demand under high-speed module design in complexity.And the visible light communication receiving end of OOK modulation at present, if simultaneously
Have received high low speed signal then can not analytic signal, so needing high speed visible light signal and low speed visible light signal visible
Optic communication receiving end is completely isolated.
However, illuminate and communicated in multiplexing scene in actual needs, it can not two kinds of optical signals are completely isolated, it uses
It is extremely inconvenient.Settling mode in application at present, first, being that low speed signal is also carried out by High Speed Modulation mode by Software Coding
Transmission, and demand of the high speed receiving module in cost, under all being designed much higher than low-speed module in complexity.Second, be will be high
Speed and low speed light source are spatially completely isolated, are unable to satisfy needs high speed and the closer scene of low speed optical signal again in this way, such as
Simultaneously, another lamp sends low speed instruction control household electrical appliance again for a lamp high speed LIFI online in bedroom, and the two can generate
It interferes with each other, especially interference of the low speed signal to high speed signal also can be considered a noise like.
Summary of the invention
It is mutual in order to high speed visible light signal at effective and inexpensive solution receiving end and low speed visible light signal
The problem of interference, the present invention propose a kind of double detector visible light communication noise-reduction method and system, are suitable for all kinds of scenes, i.e., high
Speed and low speed optical signal is closer and farther away scene.
The technical solution of the invention is as follows provides a kind of visible light noise reduction communication means, comprising the following steps:
Step 1: the optical information with target information is received using main detector and with the optical information of interference information, auxiliary
Detector only receives the optical information with interference information；
Step 2: main detector and auxiliary detector carry out photoelectric conversion to the optical information received respectively, export respectively
Photogenerated current signal；
Step 3: amplify after two-way photogenerated current signal is separately converted to voltage signal；Inhibit common mode component, to common
It is eliminated in the presence of the interference signal with interference information in two paths of signals；
Step 4: the signal for having target information is received.
The present invention also provides a kind of double detector visible light communication noise reduction systems, including receiving end, are characterized in that
It can also be transported across resistance amplifying circuit, second across resistance amplifying circuit and high cmrr including main detector, auxiliary detector, first
Calculate amplifying circuit；The output end of above-mentioned main detector connects high cmrr operational amplification circuit across resistance amplifying circuit by first
First input end；The output end of above-mentioned auxiliary detector connects high cmrr operation amplifier across resistance amplifying circuit by second
Second input terminal of circuit；The output end of above-mentioned high cmrr operational amplification circuit is connected with receiving end；
Above-mentioned main detector is located within the scope of main signal light radiation, receives main signal and part interference signal, above-mentioned
Auxiliary detector deviates main signal light radiation range, primary recipient interference signal.Two paths of signals is passed through across resistance amplifying circuit, into height
Common-mode rejection ratio amplifying circuit, output are the difference of the two, thus efficiently separate out by interference signal.
Further, above-mentioned high cmrr operational amplification circuit includes the first operational amplifier, the second operation amplifier
Device and differential operational amplifier, the input terminal of above-mentioned first output the first operational amplifier of termination across resistance amplifying circuit are above-mentioned
Second across resistance amplifying circuit output termination second operational amplifier input terminal, the output end of above-mentioned first operational amplifier with
The non-inverting input terminal of differential operational amplifier connects, the output end of above-mentioned second operational amplifier and differential operational amplifier it is anti-
The connection of phase input terminal, the output end of above-mentioned differential operational amplifier are connected with receiving end.
Further, above-mentioned main detector and auxiliary detector are PIN detector.
Further, described first is by low input impedance, high speed across resistance amplifying circuit across resistance amplifying circuit and second
Electric current turn voltage TIA amplifier composition, such as: be made of ADA4899 across resistance amplifying circuit.
Further, the first operational amplifier and second operational amplifier are high input impedance, low noise operational amplification
Device, such as: ADA4899 operational amplifier, differential operational amplifier are ADA4937 operational amplifier.
First and second operational amplifier is the operational amplifier of high gain-bandwidth product.
The beneficial effects of the present invention are:
1, the present invention separates high speed visible light signal and low speed from receiving end in the visible light communication scene of OOK modulation
Visible light signal design is set out, and in receiving end, setting two-way detector receives primary and secondary signal, and is amplified by high cmrr
Circuit carries out the isolation of primary and secondary signal, and solving luminous environment locating for receiving end, there are multi-frequency modulation light influence main signals to connect
The problem of receipts, generates the visible light communication under overlapping situation in the same area range for the visible light signal of different frequency modulation
Provide solution.
2, only need two-way detection system that the separation of high speed visible light signal and low speed visible light signal, operation side can be realized
Just, at low cost.
3, the present invention effectively improves visible light communication to the anti-interference ability of environment light, reduces the bit error rate, promotes communication
Rate.
Detailed description of the invention
Fig. 1 is the block diagram of transmitting terminal in embodiment；
Fig. 2 is the block diagram of receiving end in embodiment.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention will be further described.
Such as Fig. 1, transmitting terminal includes target signal source and interference signal source, and echo signal is modulated onto tool through overmodulated circuit
Have on the first LED light emitting source of certain modulation bandwidth, interference signal is modulated onto through overmodulated circuit with certain modulation bandwidth
The 2nd LED light emitting source on.The visible light of transmitting carrying target information after first LED light emitting source is modulated by echo signal, second
LED light emitting source is disturbed signal modulation, and transmitting carries the visible light of interference information.
Such as Fig. 2, receiving end include main detector, auxiliary detector, first across resistance amplifying circuit, second across resistance amplifying circuit
And high cmrr operational amplification circuit；The output end of main detector is connect with the first input terminal across resistance amplifying circuit, auxiliary
The output end of detector is helped to connect with the second input terminal across resistance amplifying circuit；High cmrr operational amplification circuit includes the
One operational amplifier, second operational amplifier and differential operational amplifier, first the first fortune of output termination across resistance amplifying circuit
The input terminal of amplifier, the input terminal of the second output termination second operational amplifier across resistance amplifying circuit are calculated, the first operation is put
The non-inverting input terminal of the output termination differential operational amplifier of big device, the output termination calculus of differences amplification of second operational amplifier
The output end of the inverting input terminal of device, differential operational amplifier is connected with receiving end.Main detector is located at echo signal radiation model
In enclosing, auxiliary detector deviates echo signal radiation scope.
Main detector and auxiliary detector are PIN detector in the present embodiment, first across resistance amplifying circuit and second across
Amplifying circuit is hindered by low input impedance, and high speed electric current turns voltage TIA amplifier composition, and first across resistance amplification electricity in the present embodiment
Road is to be made of ADA4899 across resistance amplifying circuit across resistance amplifying circuit with second.First operational amplifier is put with the second operation
Big device is by high input impedance, low noise operational amplifier composition.The first operational amplifier of the present embodiment and the second operation amplifier
Device uses ADA4899 operational amplifier, and differential operational amplifier is ADA4937 operational amplifier.
In conjunction with Fig. 1 and Fig. 2, main detector receives the optical information with target information that the first LED light emitting source issues, while again
The optical information with interference information of the 2nd LED light emitting source sending is had received, auxiliary detector only receives the 2nd LED light emitting source
The optical information with interference information issued, main detector and auxiliary detector carry out photoelectric conversion to the optical signal received,
Respectively output photoproduction current signal to first across resistance amplifying circuit and auxiliary across resistance amplifying circuit, first across resistance amplifying circuit and auxiliary
Help across resistance amplifying circuit pass through respectively sampling resistor by main detector and auxiliary detector output current signal be converted into voltage
Signal realizes level amplification using level-one amplifier；Amplified voltage signal enters high cmrr amplifying circuit, into
The same phase and inverting input terminal that differential amplifier circuit is respectively enterd after the secondary amplification of row inhibit common mode component, i.e., common to the two
Existing interference signal is eliminated, output echo signal to receiving end.
Claims (6)
1. a kind of double detector visible light communication noise-reduction method, which comprises the following steps:
Step 1: the optical information with target information is received using main detector and with the optical information of interference information, aided detection
Device only receives the optical information with interference information；
Step 2: main detector and auxiliary detector carry out photoelectric conversion to the optical information received respectively, export photoproduction respectively
Current signal；
Step 3: amplify after two-way photogenerated current signal is separately converted to voltage signal；Inhibit common mode component, to presence jointly
The interference signal with interference information in two paths of signals is eliminated；
Step 4: the signal for having target information is received.
2. a kind of double detector visible light communication noise reduction system, including receiving end, it is characterised in that: further include main detector, auxiliary
Help detector, first across resistance amplifying circuit, second across resistance amplifying circuit and high cmrr operational amplification circuit；The main spy
The output end for surveying device connects the first input end of high cmrr operational amplification circuit by first across resistance amplifying circuit；It is described auxiliary
The output end of detector is helped to connect the second input terminal of high cmrr operational amplification circuit across resistance amplifying circuit by second；Institute
The output end for stating high cmrr operational amplification circuit is connected with receiving end；
The main detector is located within the scope of main signal light radiation, and the auxiliary detector deviates main signal light radiation range.
3. double detector visible light communication noise reduction system according to claim 2, it is characterised in that: the high common mode inhibition
It include the first operational amplifier, second operational amplifier and differential operational amplifier than operational amplification circuit, described first across resistance
The input terminal of output the first operational amplifier of termination of amplifying circuit, described second the second fortune of output termination across resistance amplifying circuit
The input terminal of amplifier is calculated, the output end of first operational amplifier and the non-inverting input terminal of differential operational amplifier connect,
The output end of the second operational amplifier and the inverting input terminal of differential operational amplifier connect, the differential operational amplifier
Output end be connected with receiving end.
4. double detector visible light communication noise reduction system according to claim 3, it is characterised in that: the main detector with
Auxiliary detector is PIN detector.
5. double detector visible light communication noise reduction system according to claim 3, it is characterised in that: described first puts across resistance
Big circuit is to be made of ADA4899 across hindering amplifying circuit across resistance amplifying circuit with second.
6. double detector visible light communication noise reduction system according to claim 3, it is characterised in that: the first operational amplifier
It is all made of ADA4899 operational amplifier with second operational amplifier, differential operational amplifier is ADA4937 operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811360932.1A CN109327259A (en) | 2018-11-15 | 2018-11-15 | Dual-detector visible light communication noise reduction method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811360932.1A CN109327259A (en) | 2018-11-15 | 2018-11-15 | Dual-detector visible light communication noise reduction method and system |
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| CN109327259A true CN109327259A (en) | 2019-02-12 |
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| CN201811360932.1A Pending CN109327259A (en) | 2018-11-15 | 2018-11-15 | Dual-detector visible light communication noise reduction method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023197975A1 (en) * | 2022-04-15 | 2023-10-19 | 华为技术有限公司 | Optical receiver |
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| CN102338664A (en) * | 2010-07-27 | 2012-02-01 | 上海闻泰电子科技有限公司 | Real-time background deduction method for target radiometry |
| CN202856739U (en) * | 2012-10-25 | 2013-04-03 | 北京世维通科技发展有限公司 | Photoelectric detector |
| CN105355704A (en) * | 2015-12-01 | 2016-02-24 | 天津飞讯伟业科技有限公司 | Symmetrical double-PIN balance photoelectric detector |
| 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 |
| CN209046647U (en) * | 2018-11-15 | 2019-06-28 | 中国科学院西安光学精密机械研究所 | Double-detector visible light communication noise reduction system |
-
2018
- 2018-11-15 CN CN201811360932.1A patent/CN109327259A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338664A (en) * | 2010-07-27 | 2012-02-01 | 上海闻泰电子科技有限公司 | Real-time background deduction method for target radiometry |
| CN202856739U (en) * | 2012-10-25 | 2013-04-03 | 北京世维通科技发展有限公司 | Photoelectric detector |
| CN105355704A (en) * | 2015-12-01 | 2016-02-24 | 天津飞讯伟业科技有限公司 | Symmetrical double-PIN balance photoelectric detector |
| 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 |
| CN209046647U (en) * | 2018-11-15 | 2019-06-28 | 中国科学院西安光学精密机械研究所 | Double-detector visible light communication noise reduction system |
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| WO2023197975A1 (en) * | 2022-04-15 | 2023-10-19 | 华为技术有限公司 | Optical receiver |
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