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

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

VLC system and implementation method of multi-channel sub-beam flow device based on space division

technical field

The invention relates to a visible light communication system, and particularly designs a VLC system and an implementation method based on a space-divided multi-channel sub-beam flow device.

Background technique

VLC technology, as an emerging wireless communication technology that uses light-emitting devices to emit high-speed bright flashing light signals to achieve information transmission, has the advantages of green environmental protection, no electromagnetic interference, high data transmission rate, low power consumption, and high safety performance.

Although the VLC communication system has many advantages, its overall communication performance is insufficient. In order to optimize the VLC communication system, domestic and foreign industries have proposed many solutions, such as adopting OFDM, QAM, WDM, MIMO and other technical measures. A lot of research has been done on the realization of precise point-to-point communication links. However, this VLC system can only establish a communication link with a single target terminal, and cannot connect to multiple communication terminals at the same time.

Contents of the invention

In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a VLC system based on a space-divided multi-channel split beam flow device. The system not only has environmental protection, no electromagnetic interference, high data transmission rate, and high performance. It has the advantages of low power consumption, low cost, high security, etc., and it can be connected to multiple communication terminals at the same time.

In order to overcome the above-mentioned shortcomings 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 split beam flow device.

The primary purpose of the present invention is achieved through the following technical solutions: a VLC system based on space division multi-channel split beam flow device, including control management module 10, LED lamp 20, split beam flow device 30, multi-beam communication link 40 and communication Terminal 50, the split beam flow 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 first polarizer 32 and the second polarizer The module 34 performs phase modulation on the expanded beam; further, one end of the beam expansion module 31 receives the beam flow of the LED lamp 20, and the other end of the beam expansion module 31 outputs the expanded parallel light; further, the expanded parallel light The size of the first polarizer 32 is determined according to the control information of the control management module 10, one end of the first polarizer 32 receives the extended parallel light output by the beam expansion module 31, and the other end of the first polarizer 32 outputs a polarized light beam, The first port of the spatial light modulation module 33 receives the polarized light beam output by the first polarizer 32, the second port of the spatial light modulation module 33 outputs a dynamic diffracted beam flow, and the spatial light modulation module 33 The third port of the second polarizer module 34 is connected to the control management module 10, one end of the second polarizer module 34 receives the dynamic diffracted beam flow output by the spatial light modulation module 33, and the other end of the second polarizer module 34 outputs the polarization processed multiple Beam communication link 40 to free space.

Further, the control management module 10 determines the focus position of the multi-beam communication link 40 through the position information of the communication terminal 50, the communication terminal 50 is a notebook computer, a smart phone, and a tablet computer, and the communication system 50 is equipped with A flashlight device, a portable external audio interface device with optical communication function, or a portable external USB interface device with optical communication function for VLC data transmission.

Further, the spatial light modulation module 33 is a liquid crystal device with an 8-bit or 256-level phase modulation function, and the control management module 10 controls the state transition of the spatial light modulation module 33 according to the Fresnel lens function. The modulation module 33 has the function of a dynamic diffractive lens, and the function of the dynamic diffractive lens is adjusted according to the control information received by the split beam flow device 30 .

Another object of the present invention is achieved through the following technical solutions: a method for realizing a VLC system based on space division multi-channel sub-beam flow device, comprising the following steps:

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

Step 2, the expanded light beam passes through the first polarizer 32 to become polarized light treated with polarization;

Step 3, the polarized light enters the spatial light modulation 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 produce the effect of dynamic diffraction;

Step 4, the dynamic diffraction is transmitted from the spatial light modulation module 33 to the second polarizer 34 for further phase modulation;

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

The VLC system of the present invention based on space division and multi-channel split beam flow device includes: a control management module, a split beam flow device, LED lamps and a communication terminal, and the communication terminal includes a notebook computer, a smart phone and a tablet computer, etc.; the control The management module controls the movement of the focal point of the sub-beam flow according to the position information of the communication terminal. The said sub-beam flow device expands and polarizes the LED light, and produces a dynamic diffraction effect at the same time to obtain a visible light communication sub-beam that can be connected to multiple communication terminals. flow. Through the design of the split beam flow device, this system overcomes the shortcomings of point-to-point and single-target communication terminal connections in the previous VLC system, and optimizes the overall performance of the VLC system.

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

1. The present invention proposes a VLC system and method based on space-divided multi-channel split beam flow devices. Compared with the existing VLC system, it can be connected to multiple communication terminals at the same time, breaking through the previous limitation of single-target terminal communication .

2. The VLC system proposed by the present invention can effectively increase the energy density of the sub-beam flow and improve the system signal-to-noise ratio through the design of the optical module.

3. The VLC system proposed by the present invention modulates the light beam through the polarizer and the light modulation module without relying on various complex modulation techniques, and the realization of the dynamic diffraction lens model can effectively improve the multi-terminal communication performance of the system.

Description of drawings

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

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

Fig. 3 is a schematic diagram of a VLC system implementation method based on a space-divided multi-channel split beam flow device.

Detailed ways

The present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example

As shown in Figure 1, a VLC system based on space division multi-channel split beam flow device includes a control management module 10, an LED lamp 20, a split beam flow device 30, a multi-beam communication link 40 and a communication terminal 50, the The control management module 10 is mainly used to receive the position information of the communication terminal 50 and at the same time use the Fresnel lens function to regulate the sub-beam flow device 30, and then control the spatial distribution state of the sub-beam flow; further, the multi-beam communication chain The road 40 has a dynamic diffraction image with sufficient similarity; further, the communication terminal 50 is a notebook computer, a smart phone and a tablet computer, and the communication system 50 uses a built-in flashlight device, a portable external audio system with an optical communication function, etc. Interface device or portable external USB interface device with optical communication function for VLC data transmission.

As shown in FIG. 2 , the split beam flow 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 beam expansion module 31 receives LED lamps The emitted light is expanded at the same time to the light beam, so that the output from the 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 adjust the light beam further, the spatial light modulation module 33 is a liquid crystal device with an 8-bit or 256-level phase modulation function, and the control management module 10 controls the state transition of the spatial light modulation module 33 according to the Fresnel lens function , the spatial light modulation module 33 has the function of a dynamic diffractive lens, and the function of the dynamic diffractive lens is adjusted according to the control information received by the split beam flow device 30 .

As shown in Figure 3, a method for realizing a VLC system based on space division multi-channel sub-beam flow device is as follows: the LED 20 emits a beam carrying digital communication information, and enters the beam expansion module 31 at the same time, and the beam expansion The module 31 expands the light beam into a parallel light beam. Further, the expanded light beam passes through the first polarizer 32 to become polarized light, and further, the polarized light enters the spatial light modulation 33, and the spatial light The modulation module 33 receives the control information of the control management module 10 and at the same time performs phase modulation processing on the light beam to produce the effect of dynamic diffraction. Further, the dynamic diffraction is transmitted from the spatial light modulation module 33 to the second polarizer 34 for further processing. Further, after the phase modulation, a multi-beam communication link 40 is formed, and the multi-beam communication link 40 is a channel connecting the terminal and the internal VLC network.

The above-mentioned embodiment is only one embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, All simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (3)

1. A VLC system based on space-divided multi-channel split beam flow devices, including: control management module (10), LED lamps (20), split beam flow devices (30), multi-beam communication links (40) and communication terminals ( 50), characterized in that: 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), One end of the beam expansion module (31) receives the beam flow of the LED lamp (20), the other end of the beam expansion module (31) outputs expanded parallel light, and one end of the first polarizer (32) receives the beam expansion The extended parallel light output by the module (31), the other end of the first polarizer (32) outputs a polarized light beam, and the first port of the spatial light modulation module (33) receives the first polarizer (32) The output polarized processing beam, the second port of the spatial light modulation module (33) outputs a dynamic diffracted beam flow, the third port of the spatial light modulation module (33) is connected to the control management module (10), the One end of the second polarizer module (34) receives the dynamic diffracted beam flow output by the spatial light modulation module (33), and the other end of the second polarizer module (34) outputs a polarization-processed multi-beam communication link (40 ) to free space; The control management module (10) is used to determine the focus position of the multi-beam communication link (40) through the position information of the communication terminal (50), and the communication terminal (50) is a notebook computer, a smart phone or a tablet computer, so The communication terminal (50) performs VLC data transmission through its own flashlight device, a portable external audio interface device with optical communication function or a portable external USB interface device with optical communication function. 2. The VLC system based on space-divided multi-channel split beam flow device according to claim 1, characterized in that: the spatial light modulation module (33) is a liquid crystal device with 256-level phase modulation function, and the control management The module (10) controls the state transition of the spatial light modulation module (33) according to the Fresnel lens function, and the spatial light modulation module (33) has the function of a dynamic diffraction lens. 3. a kind of realization method based on the VLC system of space division multi-channel sub-beam flow device according to claim 1, is characterized in that, comprises the following steps: Step 1. The LED lamp (20) emits a beam carrying digital communication information, and simultaneously enters the beam expansion module (31), and the beam expansion module (31) expands the beam into a parallel beam; Step 2, the expanded light beam passes through the first polarizer (32) to become polarized light after polarization treatment; Step 3. The polarized light enters the spatial light modulation module (33), and the spatial light modulation module (33) receives the control information from the control management module (10) and at the same time performs phase modulation processing on the beam to generate a dynamic Diffraction effect; Step 4, the dynamically diffracted polarized light is transmitted from the spatial light modulation module (33) to the second polarizer module (34) for further phase modulation; Step 5, forming a multi-beam communication link (40) after phase modulation, and the multi-beam communication link (40) is a channel connecting the communication terminal and the internal VLC network.

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