CN104038288B - A kind of visible light communication system based on natural optic communication - Google Patents
A kind of visible light communication system based on natural optic communication Download PDFInfo
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Abstract
The invention discloses a kind of visible light communication system based on natural optic communication, including receive nature light, the intensity of the described natural light that detection receives the brightness detecting module of output detections result；Receive nature light, according to the testing result of described brightness detecting module output, select the natural optical modulator module of the described natural light with the modulation of described testing result corresponding modulation system；Wherein, described testing result and described modulation system one_to_one corresponding.The present invention is modulated with natural light for carrier, compared to artificial light sources lighting apparatus more environment protecting and power-savings such as LED, and there is not the problem bringing harm to human body.Simultaneously by way of using the natural light of nature optical modulator module directly modulation, it is to avoid the limited problem of the modulation bandwidth that causes due to LED characteristic in visible light communication.
Description
Technical Field
The invention relates to the technical field of visible light communication, in particular to a visible light communication system based on natural light communication.
Background
With the rapid development of visible Light communication technology, the white-Light LED (Light-Emitting Diode) visible Light communication technology is mainly used widely.
White light LEDs are mainly classified into two categories: RGB LEDs (red-green-blue LEDs), and pseudo-white LEDs. Pseudo-white LEDs have dominated the lighting market by their low complexity and low cost relative to RGB LEDs. The pseudo-white LED is formed by the cooperation of a blue light emitting chip and a yellow phosphor, and the blue light is filtered by a yellow filter to form pseudo-white light. However, the modulation bandwidth of pseudo-white LEDs is limited to a few MHz due to the long response time of the phosphor.
After a great deal of research on the existing visible light communication technology, the inventor finds that the existing visible light communication technology adopts the LED as the transmitting antenna, namely, the existing technology adopts artificial light source lighting equipment such as the LED and the like as a visible light transmitting end. However, the rays, the light source flicker and the high illumination emitted by the artificial light source LED can seriously affect the visual nerve of the human body, even disturb the biological clock of the human body and disturb the circadian rhythm, so that the long-term use of the LED light source can bring harm to the human body. At the same time, LEDs are subject to response times, resulting in their modulation bandwidth being limited.
Disclosure of Invention
In order to solve the problems, the invention provides a visible light communication system based on natural light communication, which realizes visible light communication based on natural light, is green and environment-friendly, and overcomes the problem of limited LED modulation bandwidth. The technical scheme is as follows:
the invention provides a visible light communication system based on natural light communication, comprising:
a natural light detection module for receiving natural light, detecting the intensity of the received natural light and outputting a detection result;
the natural light modulation module is used for receiving natural light and selecting a modulation mode corresponding to the detection result to modulate the natural light according to the detection result output by the natural light detection module;
and the detection results correspond to the modulation modes one by one.
Preferably, the natural light modulation module comprises an electrically controlled liquid crystal and a natural light modulation unit; the electric control liquid crystal comprises a liquid crystal layer, and the arrangement direction and the position of liquid crystal molecules are correspondingly changed when different electric signals are applied to all areas on the liquid crystal layer;
the natural light modulation unit is used for selecting a modulation mode corresponding to the detection result according to the detection result output by the natural light detection module;
the electric control liquid crystal is used for controlling different electric signals applied to all areas on the liquid crystal layer according to the modulation mode selected by the natural light modulation unit, so that data information is controlled to be modulated and loaded into the natural light, and the modulation of the natural light is completed.
Preferably, the modulation mode includes a binary on-off keying OOK modulation mode, a pulse amplitude modulation 4PAM modulation mode, or an OFDM modulation mode using an orthogonal frequency division multiplexing technique.
Preferably, the natural light detection module comprises an electrical signal detection module and at least one electrical signal generation module; wherein,
the electric signal generating module is used for receiving the natural light and generating an electric signal according to the received natural light; wherein the received intensity of the natural light corresponds to the intensity of the generated electric signal one by one;
the electric signal detection module is used for detecting the intensity of the electric signal generated by the electric signal generation module and outputting the intensity of the electric signal as the detection result.
Preferably, the detecting the intensity of the electrical signal generated by the electrical signal generating module by the electrical signal detecting module includes: the electric signal detection module calculates the intensity of the electric signal according to a preset algorithm and determines the intensity level of the electric signal; wherein,
when the electric signal detection module determines that the intensity level of the electric signal is excellent, the natural light modulation module selects an OFDM modulation mode;
when the electric signal detection module determines that the intensity level of the electric signal is good, the natural light modulation module selects a 4PAM modulation mode;
and when the electric signal detection module determines that the intensity level of the electric signal is poor, the natural light modulation module selects an OOK modulation mode.
Preferably, the electrical signal generating means comprises a photodetector.
Preferably, the natural light detection module further includes at least one light sensor for detecting an incident angle of the natural light to determine a relative position of a natural light source and the natural light detection module.
Preferably, the light sensor is a sun sensor.
By applying the technical scheme, the invention provides a visible light communication system based on natural light communication. Therefore, the light source is modulated by taking natural light as a carrier, is more environment-friendly and energy-saving compared with artificial light source lighting equipment such as an LED and the like, and does not bring harm to human bodies. Meanwhile, the problem of modulation bandwidth limitation caused by LED characteristics in visible light communication is avoided by adopting a mode of directly modulating natural light by the natural light modulation module.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a visible light communication system based on natural light communication according to the present invention;
fig. 2 is a schematic structural diagram of a natural light modulation module in a visible light communication system based on natural light communication according to the present invention;
fig. 3 is another schematic structural diagram of a visible light communication system based on natural light communication according to the present invention;
fig. 4 is a schematic structural diagram of a natural light detection module in a visible light communication system based on natural light communication according to the present invention;
fig. 5 is another schematic structural diagram of a natural light detection module in a visible light communication system based on natural light communication according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The visible light communication system based on natural light communication can be a specific entity device, and the device comprises a natural light detection module and a natural light modulation module. The natural light detection module and the natural light modulation module can also be two independent entity devices respectively, and the two entity devices are matched for use. The visible light communication system based on natural light communication can be specifically arranged on glass and other objects which can realize light transmission, and is used for receiving natural light emitted by natural light sources such as the sun and modulating the natural light.
Example one
Referring to fig. 1, a schematic structural diagram of a visible light communication system based on natural light communication provided by the present invention is shown, including: a natural light detection module 100 and a natural light modulation module 200. Wherein,
the natural light detection module 100 is configured to receive natural light, detect intensity of the received natural light, and output a detection result.
In this embodiment, the natural light detection module 100 may be independently installed around or in the center of the glass or at any other position, and is configured to receive the natural light, detect the intensity of the received natural light, and output the detected detection result to the natural light modulation module 200.
The natural light modulation module 200 is configured to receive natural light, and select a modulation method corresponding to a detection result to modulate the natural light according to the detection result output by the natural light detection module 100.
Wherein, the detection results correspond to the modulation modes one by one.
In this embodiment, the natural light modulation module 200 may be independently mounted around or in the center of the glass or in any other location that is in communication with the natural light detection module 100.
Of course, the present invention may also integrate the natural light detection module 100 and the natural light modulation module 200 into one physical device, which is installed around or in the center of the glass or any other position.
In the present invention, the intensity level of the natural light may be set in advance. After the natural light detection module 100 detects the intensity of the natural light, the intensity level of the current natural light is determined according to the detected intensity value of the natural light, and the intensity level of the current electrical signal is output as a detection result. Meanwhile, different modulation modes can be set in advance according to the intensity levels of different electric signals. When the natural light modulation module 200 receives the detection result output by the natural light detection module 100, a modulation method corresponding to the detection result is selected to modulate the natural light.
By applying the above technical scheme of the present invention, the natural light detection module 100 receives the natural light, detects the intensity of the received natural light and outputs a detection result, and the natural light modulation module 200 selects a modulation mode corresponding to the detection result to modulate the natural light according to the detection result output by the natural light detection module 100. Therefore, the light source is modulated by taking natural light as a carrier, is more environment-friendly and energy-saving compared with artificial light source lighting equipment such as an LED and the like, and does not bring harm to human bodies. Meanwhile, the problem of modulation bandwidth limitation caused by LED characteristics in visible light communication is avoided by adopting a mode of directly modulating natural light by the natural light modulation module.
Based on the above embodiment, reference may be made to fig. 2, which is a schematic structural diagram illustrating a natural light modulation module in a visible light communication system based on natural light communication according to the present invention. Wherein,
the natural light modulation module 200 includes an electrically controlled liquid crystal 210 and a natural light modulation unit 220. The electrically controlled liquid crystal 210 includes a liquid crystal layer 211, and the arrangement direction and position of liquid crystal molecules change correspondingly when different electric signals are applied to regions of the liquid crystal layer 211.
In the present embodiment, the liquid crystal layer 211 in the electrically controlled liquid crystal 210 is used as a light modulation material, and the liquid crystal layer 211 adopts a hybrid field effect operation mode of nematic liquid crystal. Applying different electrical signals to the liquid crystal layer 211 at different regions can cause changes in the orientation and position of the liquid crystal molecules, resulting in a change in the optical properties of the electrically controlled liquid crystal 210.
The natural light modulation unit 220 is configured to select a modulation method corresponding to the detection result according to the detection result output by the natural light detection module 100.
In this embodiment, the detection result may include an intensity level of the electric signal. The intensity levels of the electric signals can be divided into three levels of excellent, good and poor. The Modulation scheme may include an OOK (On-off keying) Modulation scheme, a 4PAM (Pulse Amplitude Modulation) Modulation scheme, and an OFDM (Orthogonal Frequency division multiplexing) Modulation scheme.
At this time, the electrically controlled liquid crystal 210 is specifically configured to control each region on the liquid crystal layer 211 to apply different electrical signals according to the modulation mode selected by the natural light modulation unit 220, so as to control the data information to be modulated and loaded into the natural light, thereby completing the modulation of the natural light.
To better implement the description of the present invention, please refer to fig. 3, which shows another structural diagram of a visible light communication system based on natural light communication according to the present invention. Wherein,
the outside of the natural light communication-based visible light communication system protected by the present invention includes a glass substrate 300. The glass substrate 300 is made of AR high-transmittance antireflection glass, the transmittance peak value can reach 99%, and the reflectivity is less than 1%. The hardness requirement of the AR glass film layer is equivalent to that of glass and is more than 7H, and the impact resistance is strong.
The natural light detection module 100 may be disposed on the glass substrate 300, and may include a periphery on which the natural light detection module 100 is disposed on the glass substrate 300, or an arbitrary position on which the natural light detection module 100 is disposed on the glass substrate 300. Preferably, a plurality of natural light detection modules 100 are included, and are uniformly disposed on the glass substrate 300 at the periphery and the center thereof. The natural light detection module 100 receives natural light from the sun, detects the intensity of the received natural light, and outputs the detection result to the natural light modulation module 200.
The natural light modulation unit 220 in the natural light modulation module 200 selects a modulation mode corresponding to the detection result according to the detection result output by the natural light detection module 100, and at this time, the electrically controlled liquid crystal 210 controls each region on the liquid crystal layer to apply different electric signals according to the modulation mode selected by the natural light modulation unit 220, so as to control the change of the arrangement direction and position of liquid crystal molecules, and perform intensity modulation on the natural light passing through the liquid crystal layer 211 to load information. The natural light is modulated by the natural light modulation module 200 after passing through the glass substrate 300.
On the basis of the above embodiment, reference may be made to fig. 4, which illustrates a schematic structural diagram of a natural light detection module in a visible light communication system based on natural light communication according to the present invention. Wherein,
the natural light detection module 100 includes an electrical signal detection module 110 and at least one electrical signal generation module 120. Wherein,
the electrical signal generating module 120 is configured to receive natural light and generate an electrical signal according to the received natural light. Wherein, the intensity of the received natural light corresponds to the intensity of the generated electric signal one by one.
In the present embodiment, the intensity of the natural light is proportional to the intensity of the electrical signal. When the intensity of the natural light is stronger, the intensity of the electrical signal generated by the electrical signal generation module 120 is higher, and the intensity of the natural light is lower, the intensity of the electrical signal generated by the electrical signal generation module 120 is lower. Therefore, the intensity of the received natural light can be detected by detecting the intensity of the generated electric signal.
In practical applications, the electrical signal generating module 120 may receive interference from other light in the natural environment, and in order to ensure the accuracy of the electrical signal detected by the electrical signal generating module 120, it is preferable to include a plurality of electrical signal generating modules 120, which respectively detect natural light from different angles.
In the present invention, the electrical signal generating module 120 may be a photodetector that converts an optical signal into an electrical signal. Therefore, the greater the intensity of the natural light illumination, the greater the intensity of the electrical signal converted by the photodetector.
The electrical signal detection module 110 is configured to detect the intensity of the electrical signal, and output the intensity of the electrical signal as a detection result.
In this embodiment, the electrical signal detection module 110 calculates the intensity of the electrical signal according to a preset algorithm and determines the intensity level of the electrical signal. In the practical application process, conditions such as the light intensity in the natural environment, the target transmission rate requirement, the bit error rate limitation and the like need to be considered, so that different preset algorithms are respectively set according to different scenes, the intensity of the electric signal is determined according to the preset algorithms, and then the intensity level of the electric signal is determined, so as to ensure the accuracy of the system.
At this time, the natural light modulation unit 220 is specifically configured to select a modulation mode corresponding to the intensity level of the electrical signal determined by the electrical signal detection module 110.
Specifically, the method may include:
when the electrical signal detection module 110 determines that the intensity level of the electrical signal is excellent, the natural light modulation unit 220 selects an OFDM modulation mode;
when the electrical signal detection module 110 determines that the intensity level of the electrical signal is good, the natural light modulation unit 220 selects a 4PAM modulation mode;
when the electric signal detection module 110 determines that the intensity level of the electric signal is a difference, the natural light modulation unit 220 selects an OOK modulation scheme.
On the basis of the foregoing embodiment, please refer to fig. 5, which illustrates another structural schematic diagram of a natural light detection module in a visible light communication system based on natural light communication according to the present invention. Wherein the natural light detection module 100 further comprises at least one light sensor 130. The light sensor 130 is configured to detect an incident angle of the natural light to determine a relative position of the natural light source and the natural light detection module 100.
In the present embodiment, the light sensor 130 is a sun sensor.
Specifically, the light sensor 130 detects an incident angle of the natural light, and determines a relative position of the natural light source with respect to the natural light detection module 100 by determining the incident angle of the natural light. And then the direction of introducing natural light is adjusted according to the determined relative position of the natural light source with respect to the natural light detection module 100, thereby ensuring that the natural light is sufficiently introduced.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The visible light communication system based on natural light communication provided by the present invention is described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A visible light communication system based on natural light communication, comprising:
a natural light detection module for receiving natural light, detecting the intensity of the received natural light and outputting a detection result;
the natural light modulation module is used for receiving natural light and selecting a modulation mode corresponding to the detection result to modulate the natural light according to the detection result output by the natural light detection module;
and the detection results correspond to the modulation modes one by one.
2. The system of claim 1, wherein the natural light modulation module comprises an electronically controlled liquid crystal and a natural light modulation unit; the electric control liquid crystal comprises a liquid crystal layer, and the arrangement direction and the position of liquid crystal molecules are correspondingly changed when different electric signals are applied to all areas on the liquid crystal layer;
the natural light modulation unit is used for selecting a modulation mode corresponding to the detection result according to the detection result output by the natural light detection module;
the electric control liquid crystal is used for controlling different electric signals applied to all areas on the liquid crystal layer according to the modulation mode selected by the natural light modulation unit, so that data information is controlled to be modulated and loaded into the natural light, and the modulation of the natural light is completed.
3. The system of claim 2, wherein the modulation scheme comprises a binary on-off keying (OOK) modulation scheme, a pulse amplitude modulation (4 PAM) modulation scheme, or an Orthogonal Frequency Division Multiplexing (OFDM) modulation scheme.
4. The system of claim 1, wherein the natural light detection module comprises an electrical signal detection module and at least one electrical signal generation module; wherein,
the electric signal generating module is used for receiving the natural light and generating an electric signal according to the received natural light; wherein the received intensity of the natural light corresponds to the intensity of the generated electric signal one by one;
the electric signal detection module is used for detecting the intensity of the electric signal generated by the electric signal generation module and outputting the intensity of the electric signal as the detection result.
5. The system of claim 4, wherein the electrical signal detection module detecting the strength of the electrical signal generated by the electrical signal generation module comprises: the electric signal detection module calculates the intensity of the electric signal according to a preset algorithm and determines the intensity level of the electric signal; wherein,
when the electric signal detection module determines that the intensity level of the electric signal is excellent, the natural light modulation module selects an OFDM modulation mode;
when the electric signal detection module determines that the intensity level of the electric signal is good, the natural light modulation module selects a 4PAM modulation mode;
and when the electric signal detection module determines that the intensity level of the electric signal is poor, the natural light modulation module selects an OOK modulation mode.
6. The system of claim 4, wherein the electrical signal generation module comprises a photodetector.
7. The system of claim 4, wherein the natural light detection module further comprises at least one light sensor for detecting an angle of incidence of the natural light to determine a relative position of a natural light source and the natural light detection module.
8. The system of claim 7, wherein the light sensor is a sun sensor.
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|---|---|---|---|---|
| US9906275B2 (en) * | 2015-09-15 | 2018-02-27 | Energous Corporation | Identifying receivers in a wireless charging transmission field |
| CN105656552B (en) * | 2016-01-08 | 2017-12-22 | 北京邮电大学 | The optimization method and device of energy-saving illumination in a kind of indoor visible light communication |
| CN105743578A (en) * | 2016-03-15 | 2016-07-06 | 王基民 | Simulated natural light illumination and communication technique |
| CN107544549B (en) * | 2016-06-24 | 2021-03-12 | 北京末元科技有限公司 | Positioning and data transmission method and system suitable for VR equipment |
| CN110474682B (en) * | 2019-08-06 | 2022-02-15 | 桂林理工大学 | Signal sending method for PLC (programmable logic controller) fusion visible light communication by overlapping natural light |
| CN110649969B (en) * | 2019-09-24 | 2021-05-18 | 成都信息工程大学 | Ultra-low power consumption mirror reflection light communication device and method |
| CN110784266B (en) * | 2019-10-17 | 2021-03-16 | 烽火通信科技股份有限公司 | Modulation-demodulation method for matched code pattern and ultra-high-speed optical module |
| CN113890611B (en) * | 2021-10-12 | 2022-10-11 | 中国人民解放军战略支援部队信息工程大学 | Communication device and method based on natural light |
| CN114362822B (en) * | 2021-12-08 | 2023-08-22 | 中国人民解放军战略支援部队信息工程大学 | Based on LiNbO 3 Natural light communication method of body modulator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4573214A (en) * | 1981-02-12 | 1986-02-25 | The United States Of America As Represented By The Secretary Of The Navy | Satellite mounted system for transferring information using modulated sunlight |
| CN102098105A (en) * | 2011-01-06 | 2011-06-15 | 中兴通讯股份有限公司 | Self-adaptively modulated optical fiber communication method and system |
| CN103746769A (en) * | 2013-10-08 | 2014-04-23 | 上海交通大学 | Adaptive OFDM modulation system for raising capacity of visible light communication system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780667A (en) * | 2011-05-13 | 2012-11-14 | 北京联拓恒芯科技发展有限公司 | Method and equipment for modulating physical layer of digital interphone |
| CN102778897B (en) * | 2012-07-03 | 2015-08-12 | 中天同圆太阳能高科技有限公司 | The tracking of solar tracking device and device |
-
2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4573214A (en) * | 1981-02-12 | 1986-02-25 | The United States Of America As Represented By The Secretary Of The Navy | Satellite mounted system for transferring information using modulated sunlight |
| CN102098105A (en) * | 2011-01-06 | 2011-06-15 | 中兴通讯股份有限公司 | Self-adaptively modulated optical fiber communication method and system |
| CN103746769A (en) * | 2013-10-08 | 2014-04-23 | 上海交通大学 | Adaptive OFDM modulation system for raising capacity of visible light communication system |
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