CN106656328B

CN106656328B - Space division-based multichannel beam splitting device VLC system and implementation method

Info

Publication number: CN106656328B
Application number: CN201611080890.7A
Authority: CN
Inventors: 文尚胜; 彭星; 关伟鹏; 吴津
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2016-11-30
Filing date: 2016-11-30
Publication date: 2023-03-21
Anticipated expiration: 2036-11-30
Also published as: CN106656328A

Abstract

The invention discloses a VLC system based on a space division multi-channel beam splitting device, which comprises: the system comprises a control management module, an LED lamp, a beam splitting beam device, a multi-beam communication link and a communication terminal; the invention also discloses a realization method of the VLC system based on the space division multi-channel beam splitting device, which comprises the following steps: 1. the LED lamp emits light beams carrying digital communication information and simultaneously enters the light beam expansion module; 2. expanding the light beam into polarized light for polarization processing; 3. the spatial light modulation module receives the control information of the control management module and simultaneously performs phase modulation processing on the light beam to generate a dynamic diffraction effect; 4. the dynamically diffracted light is transmitted from the spatial light modulation module to a second polaroid for further phase modulation; 5. after phase modulation, a multi-beam communication link is formed. The method has the advantages of optimizing the overall performance of the VLC system and the like.

Description

Space division-based multichannel beam splitting device VLC system and implementation method

Technical Field

The invention relates to a visible light communication system, in particular to a VLC system based on a space division multi-channel beam splitting device and an implementation method.

Background

The VLC technology, as a new wireless communication technology for implementing information transmission by using a light emitting device to emit a high-speed bright flashing light signal, has the advantages of environmental friendliness, no electromagnetic interference, high data transmission rate, low power consumption, high safety performance and the like.

Although the VLC communication system has many advantages, the overall communication performance of the VLC communication system is not sufficient, in order to optimize the VLC communication system, many solutions are proposed in domestic and foreign industries, for example, technical measures such as OFDM, QAM, WDM, MIMO and the like are taken, meanwhile, researchers have conducted many studies on the point-to-point communication link for realizing precision, however, the VLC system can only establish a communication link of a single target terminal, and cannot be connected with a plurality of communication terminals at the same time.

Disclosure of Invention

In order to overcome the above drawbacks and deficiencies of the prior art, a primary object of the present invention is to provide a VLC system based on a spatial division multi-channel beam splitting device, which has the advantages of environmental protection, no electromagnetic interference, high data transmission rate, low power consumption, low cost, high safety, and the like, and can be connected to a plurality of communication terminals simultaneously.

In order to overcome the above-mentioned drawbacks and deficiencies of the prior art, another object of the present invention is to provide a method for implementing a VLC system based on a spatially divided multi-channel beam splitting device.

The primary purpose of the invention is realized by the following technical scheme: a VLC system based on a space division multi-channel beam splitting device comprises a control management module 10, an LED lamp 20, a beam splitting device 30, a multi-beam communication link 40 and a communication terminal 50, wherein the beam splitting device 30 comprises a beam expanding module 31, a first polaroid 32, a spatial light modulation module 33 and a second polaroid module 34; further, the first polarizer 32 and the second polarizer module 34 perform phase modulation on the expanded beam; further, one end of the beam expansion module 31 receives a beam current of the LED lamp 20, and the other end of the beam expansion module 31 outputs expanded parallel light; further, the size of the expanded parallel light is determined according to the control information of the control management module 10, one end of the first polarizer 32 receives the expanded parallel light output by the beam expansion module 31, the other end of the first polarizer 32 outputs a polarization processing beam, a first port of the spatial light modulation module 33 receives the polarization processing beam output by the first polarizer 32, a second port of the spatial light modulation module 33 outputs a dynamic diffracted beam, a third port of the spatial light modulation module 33 is connected to the control management module 10, one end of the second polarizer module 34 receives the dynamic diffracted beam output by the spatial light modulation module 33, and the other end of the second polarizer module 34 outputs the polarization processing multi-beam communication link 40 to the free space.

Further, the control management module 10 determines the focal position of the multi-beam communication link 40 according to the position information of the communication terminal 50, where the communication terminal 50 is a notebook computer, a smart phone or a tablet computer, and the communication system 50 performs VLC data transmission through a flash device, an external audio interface device with an optical communication function or an external USB interface device with an optical communication function.

Further, the spatial light modulation module 33 is a liquid crystal device having an 8-bit 256-level phase modulation function, the control management module 10 controls the state transition of the spatial light modulation module 33 according to a fresnel lens function, the spatial light modulation module 33 has a function of a dynamic diffraction lens, and the function of the dynamic diffraction lens is adjusted according to control information received by the beam splitting device 30.

The other purpose of the invention is realized by the following technical scheme: a method for realizing a VLC system based on a space division multi-channel beam splitting device comprises the following steps:

step 1, the LED lamp 20 emits a light beam carrying digital communication information and simultaneously enters a light beam expansion module 31, and the light beam expansion module 31 expands the light beam into a parallel light beam;

step 2, the expanded beam becomes polarized light after polarization processing through the first polarizer 32;

step 3, the polarized light after polarization processing enters a spatial light modulation 33, and the spatial light modulation 33 receives the control information of the control management module 10 and simultaneously performs phase modulation processing on the light beam to generate a dynamic diffraction effect;

step 4, the dynamically diffracted light is emitted from the spatial light modulation module 33 to the second polarizer 34 for further phase modulation;

and 5, forming a multi-beam communication link 40 after phase modulation, wherein the multi-beam communication link 40 is a channel for connecting the terminal and the internal VLC network.

The VLC system of the space division multi-channel beam splitting device comprises: the system comprises a control management module, a beam splitting beam device, an LED lamp and a communication terminal, wherein the communication terminal comprises a notebook computer, a smart phone, a tablet personal computer and the like; the control management module controls the movement of the focus of the beam splitting beam according to the position information of the communication terminal, and the beam splitting beam device expands and polarizes LED light, and simultaneously generates a dynamic diffraction effect to obtain visible light communication beam which can be connected with multiple communication terminals. The system overcomes the defects of the connection of the point-to-point and single-target communication terminals of the conventional VLC system through the design of the beam splitting device, and optimizes the overall performance of the VLC system.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. compared with the existing VLC system, the VLC system can be simultaneously connected with a plurality of communication terminals, and the limitation of the conventional single-target terminal communication is broken through.

2. The VLC system provided by the invention can effectively improve the energy density of the beam splitting beams and improve the signal-to-noise ratio of the system through the design of the optical module.

3. The VLC system provided by the invention modulates the light beams by the polaroid and the light modulation module without depending on various complex modulation technologies, and the realization of the dynamic diffraction lens model can effectively improve the multi-terminal communication performance of the system.

Drawings

Fig. 1 is a schematic diagram of a VLC system of a multi-channel beam splitting device based on space division.

Fig. 2 is a schematic diagram of a beam splitting device.

Fig. 3 is a schematic diagram of a VLC system implementing method based on a spatial division multi-channel beam splitting device.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.

Examples

As shown in fig. 1, a VLC system based on a spatial division multi-channel beam splitting device includes a control management module 10, an LED lamp 20, a beam splitting device 30, a multi-beam communication link 40, and a communication terminal 50, where the control management module 10 is mainly configured to receive position information of the communication terminal 50, and simultaneously, regulate and control the beam splitting device 30 by using a fresnel lens function, so as to control a spatial distribution state of a beam splitting beam; further, the multi-beam communication link 40 has dynamic diffraction images with sufficient similarity; further, the communication terminal 50 is a notebook computer, a smart phone, or a tablet computer, and the communication system 50 performs VLC data transmission through a flash device, a portable external audio interface device with an optical communication function, or a portable external USB interface device with an optical communication function.

As shown in fig. 2, the beam splitting device 30 includes a beam expansion module 31, a first polarizer 32, a spatial light modulation module 33, and a second polarizer module 34; further, the light beam expansion module 31 receives the light emitted by the LED lamp and expands the light beam at the same time, so that the light beam output from the light beam expansion module 31 is a parallel light beam; further, the first polarizer 32 and the second polarizer module 34 are mainly used to assist the spatial light modulation module to modulate the phase of the light beam; further, the spatial light modulation module 33 is a liquid crystal device having an 8-bit 256-level phase modulation function, the control management module 10 controls the state transition of the spatial light modulation module 33 according to a fresnel lens function, the spatial light modulation module 33 has a function of a dynamic diffraction lens, and the function of the dynamic diffraction lens is adjusted according to control information received by the beam splitting device 30.

As shown in fig. 3, an implementation method of a VLC system based on a spatial division multi-channel beam splitting device is as follows: the LED 20 emits a light beam carrying digital communication information and enters the beam expansion module 31 at the same time, the beam expansion module 31 expands the light beam into a parallel light beam, further, the expanded light beam becomes polarized light through the first polarizer 32, further, the polarized light enters the spatial light modulator 33, the spatial light modulator 33 receives control information of the control management module 10 and performs phase modulation processing on the light beam at the same time to generate a dynamic diffraction effect, further, the dynamically diffracted light beam is emitted from the spatial light modulator 33 to the second polarizer 34 for further phase modulation, further, a multi-beam communication link 40 is formed after the phase modulation, and the multi-beam communication link 40 is a channel connecting a terminal and an internal VLC network.

The above embodiment is only one embodiment of the present invention, but the embodiment of the present invention is not limited by the above embodiment, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention and are equivalent to each other are included in the protection scope of the present invention.

Claims

1. VLC system based on space divides multichannel beam current device includes: control management module (10), LED lamps and lanterns (20), beam split device (30), multi-beam communication link (40) and communication terminal (50), its characterized in that: the beam splitting device (30) comprises: the LED illumination device comprises a beam expansion module (31), a first polaroid (32), a spatial light modulation module (33) and a second polaroid module (34), wherein one end of the beam expansion module (31) receives a beam flow of an LED lamp (20), the other end of the beam expansion module (31) outputs expanded parallel light, one end of the first polaroid (32) receives the expanded parallel light output by the beam expansion module (31), the other end of the first polaroid (32) outputs polarized processing beams, a first port of the spatial light modulation module (33) receives the polarized processing beams output by the first polaroid (32), a second port of the spatial light modulation module (33) outputs dynamic diffraction beam current, a third port of the spatial light modulation module (33) is connected with a control management module (10), one end of the second polaroid module (34) receives the dynamic diffraction beam current output by the spatial light modulation module (33), and the other end of the second polaroid module (34) outputs a polarized processing multi-beam communication link (40) to a free space;

the control management module (10) is used for determining the focus position of the multi-beam communication link (40) through position information of a communication terminal (50), the communication terminal (50) is a notebook computer, a smart phone or a tablet computer, and the communication terminal (50) carries out VLC data transmission through a flash lamp device, a portable external audio interface device with an optical communication function or a portable external USB interface device with an optical communication function.

2. The VLC system based on the spatially divided multi-channel beam splitting device of claim 1, wherein: the spatial light modulation module (33) is a liquid crystal device with 256-level phase modulation function, the control management module (10) controls state transition of the spatial light modulation module (33) according to a Fresnel lens function, and the spatial light modulation module (33) has the function of a dynamic diffraction lens.

3. An implementation method of the VLC system based on the spatial division multi-channel beam splitting device as claimed in claim 1, comprising the steps of:

step 1, emitting a light beam carrying digital communication information by an LED lamp (20), and simultaneously entering a light beam expansion module (31), wherein the light beam expansion module (31) expands the light beam into a parallel light beam;

step 2, the expanded light beam becomes polarized light after polarization treatment through a first polarizing film (32);

step 3, the polarized light after polarization processing enters a spatial light modulation module (33), and the spatial light modulation module (33) receives the control information of the control management module (10) and simultaneously performs phase modulation processing on the light beam to generate a dynamic diffraction effect;

step 4, the polarized light after dynamic diffraction is emitted from the spatial light modulation module (33) to the second polaroid module (34) for further phase modulation;

and 5, forming a multi-beam communication link (40) after phase modulation, wherein the multi-beam communication link (40) is a channel for connecting the communication terminal and the internal VLC network.