CN120454860A - Communication system based on visible light - Google Patents

Abstract

The application provides a communication system based on visible light, wherein a first visible light receiver and a second visible light receiver both comprise a distance optimization receiving module, an angle optimization receiving module and a merging module, a receiving end of the distance optimization receiving module receives a first visible light signal irradiated by multiple angles and generates a first electric signal and sends the first electric signal to a first receiving end of the merging module through an output end, a receiving end of the angle optimization receiving module receives the first visible light signal and generates a second electric signal and sends the second electric signal to a second receiving end of the merging module through the output end, and the merging module merges the received first electric signal and the second electric signal to generate a visible light receiving pin of the optimized electric signal which is sent to a first control board/a second control board through the output end so that the first control board/the second control board can execute corresponding processing steps according to the optimized electric signal.

Description

Communication system based on visible light

Technical Field

The application relates to the technical field of communication, in particular to a communication system based on visible light.

Background

Radio communication technology has become an important infrastructure of modern information society, and is widely applied to the fields of mobile communication, internet of things, broadcast television and the like. Conventional radio communication relies on electromagnetic waves to propagate information in space, but its application is limited by transmit power limitations and electromagnetic interference problems. To address this issue, visible light communication (Visible Light Communication, VLC) techniques have been developed that take advantage of the high-frequency flicker nature of LED illumination sources to transmit data, with the advantages of no electromagnetic radiation, spectrum exemption, co-location deployment with illumination devices, etc.

The existing visible light communication system is generally composed of an LED lamp provided with a special modulation circuit and terminal equipment with a photoelectric sensor, and a network architecture integrating illumination and communication is formed. In a typical application scenario, downlink data is transmitted through a visible light band, and uplink data mostly adopts an infrared or radio frequency band as a return channel. However, the current system has the significant disadvantage that high-rate communication can only be achieved when the transmitting end and the receiving end maintain a fixed relative orientation, and the stability of the communication link drops dramatically when the optical path is blocked or the angle of incidence changes due to movement of the terminal.

Disclosure of Invention

The embodiment of the application aims to provide a communication system based on visible light, which is used for solving the technical problem that the high-speed communication effect is poor in the scene that the distance between a transmitting end and a receiving end of the existing visible light communication system is not fixed.

In a first aspect, the present invention provides a communication system based on visible light, the communication system including a plurality of communication terminals and a plurality of lamp terminals, the communication terminals including a first visible light receiver, a first visible light emitter, and a first control board, the lamp terminals including a second visible light receiver, a second visible light emitter, and a second control board, the first visible light receiver and the second visible light receiver each including a distance-optimized receiving module and an angle-optimized receiving module and a combining module, the receiving terminals of the distance-optimized receiving module receiving a first visible light signal irradiated at multiple angles and generating a first electrical signal and transmitting the first electrical signal to the first receiving terminal of the combining module through an output terminal, the receiving terminals of the angle-optimized receiving module receiving the first visible light signal and generating a second electrical signal and transmitting the second electrical signal to the second receiving terminal of the combining module through an output terminal, and the combining module combining the received first electrical signal and the second electrical signal to visible light receiving pins of the first control board/the second control board so that the first control board/the second control board performs a corresponding processing step according to the optimized electrical signal.

In an alternative embodiment, the distance optimizing receiving module includes a convex lens and a first photodiode, wherein the convex lens is disposed at a first opening of a surface of a housing of the communication terminal and forms a first accommodating space with the housing, and the first photodiode is disposed in the first accommodating space and is located at a focal point of the convex lens.

In an alternative embodiment, the angle optimization receiving module comprises a planar light-transmitting lens and a second photodiode, wherein the planar light-transmitting lens is arranged at a second opening on the surface of the shell of the communication terminal and forms a second accommodating space with the shell, and the second photodiode is arranged in the second accommodating space and is positioned on the central axis of the planar light-transmitting lens.

In an alternative embodiment, the communication terminal further comprises a voice receiver, the first control board comprises a main control chip and a voice processing chip which are connected with each other, the voice receiver is connected with the voice processing chip, the first visible light emitter comprises a third photodiode, the third photodiode is connected with the main control chip,

The voice receiver receives the voice of the holder of the communication terminal, generates an analog signal and sends the analog signal to the voice processing chip;

the voice processing chip processes the received analog signals into digital signals and sends the digital signals to the main control chip;

The main control chip drives the third photodiode based on the received digital signal to emit a first visible light signal.

In an alternative embodiment, the network ports of the second control boards of the plurality of lamp ends are connected through network cables to form a local area network.

In an alternative embodiment, after the second visible light receiver of the target lamp end receives the first visible light signal, the optimized electric signal is sent to the second control board of the other lamp end through the local area network;

The second control boards of the other lamp ends respectively generate corresponding second visible light signals according to the optimized electric signals and transmit the corresponding second visible light signals through the second visible light emitters so that the first visible light receivers of the communication terminal receive the second visible light signals at different positions.

In an alternative embodiment, the communication terminal further comprises a voice player, the first visible light signal is used for indicating the audio data collected by the voice receiver, the terminal identification and the channel identification of the communication terminal,

After a main control chip received by the communication terminal receives an optimized electrical signal corresponding to the first visible light signal, determining whether the indicated terminal identifier and the channel identifier pass verification;

And if the verification is passed, playing the corresponding audio data through the voice player.

In an alternative embodiment, the communication terminal further comprises a display for displaying the channel identification of the terminal device.

In an alternative embodiment, the communication terminal further comprises a communication key,

The main control chip responds to the communication signal triggered by the communication key to control the voice receiver to start to collect sound.

In an alternative embodiment, after the second visible light receiver of the target lamp end receives the first visible light signal, the optimized electric signal is sent to the second control boards of all other lamp ends under the current channel identifier through the local area network.

The application provides a communication system based on visible light, which comprises a plurality of communication terminals and a plurality of lamp terminals, wherein the communication terminals comprise a first visible light receiver, a first visible light emitter and a first control board, the lamp terminals comprise a second visible light receiver, a second visible light emitter and a second control board, the first visible light receiver and the second visible light receiver comprise a distance optimizing receiving module, an angle optimizing receiving module and a merging module, the receiving end of the distance optimizing receiving module receives a first visible light signal irradiated by multiple angles, generates a first electric signal and sends the first electric signal to the first receiving end of the merging module through an output end, the receiving end of the angle optimizing receiving module receives the first visible light signal, generates a second electric signal and sends the second electric signal to the second receiving end of the merging module through the output end, and the merging module merges the received first electric signal with the received second electric signal and sends the optimized electric signal to visible light receiving pins of the first control board/the second control board through the output end so that the first control board/the second control board can execute corresponding processing steps according to the optimized electric signal. By additionally arranging the optical device on the visible light receiver, the angle of light rays which can be received by the visible light receiver is larger, the distance is longer, and further the limitation of the visible light communication network on the angle and the distance is lightened, and good high-speed communication can be realized under the condition that the transmitting end and the receiving end relatively move.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a communication system based on visible light according to an embodiment of the present application;

fig. 2 is a schematic diagram of a logic control structure of a communication terminal according to an embodiment of the present application;

fig. 3 is a schematic diagram of a logic control structure of a lamp end according to an embodiment of the present application.

Detailed Description

First, an application scenario of the present application will be described. The technical scheme of the application can be suitable for visible light communication.

The downlink data of the existing visible light communication system is transmitted through a visible light wave band, and the uplink data is mostly transmitted through an infrared or radio frequency band as a return channel, so that a lighting-communication integrated network architecture is formed. However, the conventional visible light communication system has a poor mobile receiving effect, a small coverage, and cannot be applied to some special scenes that limit infrared signals.

Based on this, the present application provides a communication system based on visible light.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

Example 1

Fig. 1 is a schematic structural diagram of a communication system based on visible light according to an embodiment of the present application. As shown in fig. 1, the communication system includes a plurality of communication terminals and a plurality of lamp terminals. The specific number of communication terminals and lamp terminals is not limited herein.

The communication terminal includes a first visible light receiver, a first visible light emitter, and a first control board. The first visible light emitter may be an LED lamp.

The lamp end comprises a second visible light receiver, a second visible light emitter and a second control board. The second visible light emitter may be an LED lamp.

In a visible light communication system, for engineering, an LED lamp also has an illumination function, so that light of the LED is generally scattered. Based on the characteristic analysis of light, the more the light is concentrated and the more the energy is concentrated, the more communication data is transmitted, and the higher transmission rate can be realized, but the transmission distance is shortened.

In this embodiment, the visible light emitter has an illumination function, and light modulation is performed on all downstream data. The application also carries out large-angle and long-distance light converging and collecting on the visible light receiver when the LED lamp carries out light scattering treatment.

The first visible light receiver and the second visible light receiver both comprise a distance optimization receiving module, an angle optimization receiving module and a merging module.

The distance optimizing receiving module may include a convex lens disposed at the first opening of the housing surface of the communication terminal and forming a first receiving space with the housing, and a first photodiode disposed within the first receiving space and located at a focal point of the convex lens. The receiving end of the distance optimization receiving module receives the first visible light signals irradiated by multiple angles, generates first electric signals and sends the first electric signals to the first receiving end of the merging module through the output end.

Specifically, the convex lens can be mounted at the opening of the front housing surface of the communication terminal/lamp end through the fixing base. The front shell and the rear shell are fixed through buckling positions.

The angle optimization receiving module comprises a plane light-transmitting lens and a second photodiode, wherein the plane light-transmitting lens is arranged at a second opening on the surface of the shell of the communication terminal and forms a second accommodating space with the shell, and the second photodiode is arranged in the second accommodating space and is positioned on the central axis of the plane light-transmitting lens. The second photodiode can receive incident light rays having an incident angle of 30 DEG to 150 DEG through the planar lens. The receiving end of the angle optimization receiving module receives the first visible light signal, generates a second electric signal and sends the second electric signal to the second receiving end of the merging module through the output end.

The planar light-transmitting mirror may here be glued at the opening in the front housing surface at the communication terminal/lamp end. The plane light-transmitting lens can be made of transparent acrylic sheet, transparent glass or other transparent materials.

Specifically, when the external light source irradiates the convex lens vertically, the light is focused on the first photodiode, the current of the diode becomes larger due to the gathering effect of the convex lens on the light under the same illumination intensity, and when the distance between the light source and the receiver is increased, the receiver with the convex lens can still receive a long-distance signal. The angle optimization receiving module can receive the incident light rays with larger incident angles at the same time, and realizes the signal reception with large angles.

When the visible light source is not perpendicularly (at an angle) irradiated on the photodiodes, the convex lens above the first photodiode forms a weaker signal on the first photodiode due to the small focusing angle. At this time, the second photodiode receives a light source signal having a certain incident angle based on the function of the planar lens.

The combining module combines the received first electric signal and the received second electric signal to generate an optimized electric signal, and the optimized electric signal is sent to a visible light receiving pin of the first control board/the second control board through an output end, so that the first control board/the second control board executes corresponding processing steps according to the optimized electric signal.

The combining module is configured to combine the first electrical signal and the second electrical signal, and specifically, signal combining algorithms such as maximum ratio shift combining (MRC: maximal Ratio Combining), equal gain combining (EGC: equal Gain Combining), selective combining (SC: selection Combining), and switching combining (SWITCHING COMBINING) may be used, which are not limited herein. The optimized electric signals output by the combining module are combined with the first electric signal of the distance optimized receiving module and the second electric signal of the angle optimized receiving module, so that the signal fading probability can be greatly reduced, and the communication quality is ensured.

According to the communication system based on the visible light, the optical device is additionally arranged on the visible light receiver, so that the angle of light rays which can be received by the visible light receiver is larger, the distance is longer, the limitation of the visible light communication network on the angle and the distance is further reduced, and good high-speed communication can be realized under the condition that the transmitting end and the receiving end relatively move.

Example two

In one embodiment of the present application, a communication method of a communication system based on visible light is provided.

The network ports of the second control boards of the plurality of lamp ends are connected through network cables to form a local area network. Signal interaction can be performed between different lamp ends.

The communication terminal further comprises a voice receiver and a voice player, the first control board comprises a main control chip and a voice processing chip which are connected with each other, the voice receiver is connected with the voice processing chip, the first visible light emitter comprises a third photodiode, and the third photodiode is connected with the main control chip.

The chip here may be an MCU (Microcontroller Unit, microcontroller) or the like.

The voice receiver may be a microphone for collecting the sound of the holder, and receives the sound of the holder of the communication terminal, generates an analog signal, and transmits the analog signal to the voice processing chip. The voice processing chip processes the received analog signals into digital signals and sends the digital signals to the main control chip. The main control chip drives the third photodiode based on the received digital signal to emit a first visible light signal. The voice player may be a power amplifier and a speaker. The communication terminal may further comprise a headset interface for the holder to use the headset.

And after the second visible light receiver of the target lamp end receives the first visible light signal, sending the optimized electric signal to the second control boards of other lamp ends through the local area network. The second control boards of the other lamp ends respectively generate corresponding second visible light signals according to the optimized electric signals and transmit the second visible light signals through the second visible light emitters so that the first visible light receivers of the communication terminal can receive the second visible light signals. The communication terminal can convert the received first visible light signal into corresponding audio data and play the corresponding audio data.

For example, the communication terminal a may convert the sound of the holder into a corresponding visible light signal and transmit the same to the light terminal a. The optical terminal a can receive the first optical signal through the second visible light receiver and forward the first optical signal to the lamp terminal B through the network cable. The lamp end B is converted into a corresponding second visible light signal through the second control board based on the optimized electric signal, and the corresponding second visible light signal is sent to the communication terminal B through the second visible light emitter. The communication terminal B receives through the first visible light receiver and plays through the voice player.

In one embodiment, in order to avoid congestion of the communication channel, each communication terminal may be preset with a corresponding communication terminal ID. All communication terminal IDs can be stored in the second control panel of the lamp end, and the lamp end establishes a data transmission channel by identifying the communication terminal ID.

The first visible light signal sent by the communication terminal or the lamp end is used for indicating the audio data collected by the voice receiver to further indicate the terminal identification and the channel identification of the corresponding communication terminal.

The lamp end identifies the terminal identification and the channel identification indicated by the first visible light signal sent by the communication terminal, and for different channel identifications, different frequency sub-bands can be used by different channels based on a hybrid multiplexing technology, so that frequency division multiplexing is realized. In particular, spatial multiplexing (SDM) and Frequency Division Multiplexing (FDM) may be included, for example, MIMO-OFDM, where spatial multiplexing is implemented by multiple transmit and receive arrays in the system.

The method includes that after a main control chip received by a communication terminal receives an optimized electrical signal corresponding to a first visible light signal, whether a terminal identifier and a channel identifier indicated by the main control chip pass verification is determined. And if the verification is passed, playing the corresponding audio data through the voice player.

Therefore, the lamp end can be abutted against a plurality of communication terminals, and communication confusion among different communication terminals is avoided.

Example III

In this embodiment, a communication terminal and a lamp terminal are provided.

A schematic diagram of the logic control structure of the communication terminal may be shown in fig. 2. The communication terminal may be a handheld terminal. The communication terminal may include a first visible light receiver, a first visible light emitter, and a first control board. The first control board may include a main control chip, a voice processing chip, a charge management chip, an EEPROM chip, a FLASH chip, and an electricity meter chip, which are connected to each other.

The communication terminal further comprises a display for displaying the channel identification of the terminal device, the terminal name, etc. Information such as the working state, the electric quantity, the volume and the like of the communication terminal can be displayed.

The main control chip of the communication terminal is connected with an indicator lamp through a GPIO pin. The indicator light may indicate an operating state of the communication terminal, an electric quantity/charging state, a voice upload/answer prompt, etc. The indicator light may be a red-green bi-color LED light.

In an alternative embodiment, the communication terminal further comprises a communication key, and the main control chip is connected with the key through a GPIO pin. The main control chip responds to the communication signal triggered by the communication key to control the voice receiver to start to collect sound. The keys may be a plurality of keys for controlling "volume+", "volume-", "PTT", "channel switch", "on/off", respectively. Wherein, the on/off control, volume +/-control and channel switching control are not affected by service, and the user can regulate and control at any time. The effect of the PTT control key is affected by the service, and the PTT control key only has the control function of the voice service after the channel resource is successfully acquired.

The main control chip of the communication terminal is also connected with a TYPE-C interface through a SWD/USART pin. The TYPEC interface can be used for battery charging, program burning, communication and the like, and also can be used as an earphone interface.

The main control chip of the communication terminal is also connected with a battery voltage acquisition circuit through an ADC pin and used for monitoring the battery state.

The main control chip of the communication terminal is also connected with the fuel gauge chip through an IIC/GPIO pin, connected with the charging management chip through a GPIO pin, connected with the Flash chip through an SPI pin, and connected with the EEPROM chip through an IIC pin.

And a detector operational amplifier and a comparator circuit are also connected between the main control chip of the communication terminal and the output end of the merging module. And the main control chip of the communication terminal is connected with the detector operational amplifier and the comparator circuit through a USART pin.

The main control chip of the communication terminal is connected with the voice processing chip through the IIC/SPI pin. The voice processing chip is used for encoding and decoding signals. The analog signals collected by the microphone are converted into digital signals, the digital signals are coded and modulated by the voice processing chip and are sent to the main control chip, and the main control chip drives the corresponding LED lamps based on the received modulated signals, so that the voice signals are converted into optical signals.

In a specific embodiment, the communication terminal can be actively connected to the lamp terminal, and the communication terminal is automatically offline after the heartbeat packet of the lamp terminal is not received after the communication terminal is overtime. When the communication terminal is placed under the lamp, the communication terminal automatically starts to be accessed, the function ensures that the communication terminal is regulated and controlled by the system after being accessed to the network, and the ordering and the safety of the optical path interaction when multiple users under the lamp are concurrent are ensured.

After the communication terminal is continuously idle for 2 minutes, the screen and other peripheral equipment are automatically closed, and the communication terminal enters a sleep mode. The terminal still keeps the monitoring capability of the service in the dormant state, and automatically exits the dormant mode after the terminal recognizes any event such as state change, existence of the service and the like.

The communication terminal can provide voice service for the user after successful network access. After recognizing that the user presses the PTT key, the communication terminal applies for channel resources to the lamp end, collects sound through the microphone, transmits the sound to the lamp end through the optical path after compression, and prompts through the display screen to finish voice uploading. When the communication terminal monitors the optical signal sent by the lamp end, the optical signal is automatically analyzed, if the terminal identification and the channel identification are correct, the decoding is played, and the prompting can be carried out through the display screen.

The schematic diagram of the logic control structure of the lamp end can be shown in fig. 3. The lamp end is provided with TYPE-C interface, DC interface, LED lamp control interface, visible light receiving port, ethernet interface, pilot lamp control interface respectively.

The TYPE-C interface and the main control chip at the lamp end can be connected through SWD or USART pins, and program burning and communication can be performed. The DC (power supply) interface is used for outputting a switching signal to the LED driving lamp panel. The visible light receiving port is used for receiving the optimized electric signals. The Ethernet port is used for carrying out bidirectional data transmission with other lamp ends. The LED lamp control interface and the main control chip at the lamp end can be connected through a USART pin and used for controlling the LED lamp to send visible light signals. The main control chip of the indicator light control interface and the light end can be connected through GPIO pins for controlling the indicator light. The indicator light can indicate the working state of the light end.

The second visible light receiver, the second visible light emitter and the second control board of the lamp end can be integrated in the same shell, or can be formed independently. For example, the second control board and the second visible light emitter body may be disposed on a ceiling, and the second visible light receiver body may be disposed on a ceiling or a wall.

After the communication system is started, the lamp end can record the terminal identification and the channel identification of the communication terminal after the communication terminal is successfully connected to the lamp end, and start the periodic polling terminal, and if the terminal is overtime and has no response, the terminal is regarded as off-line, and all the resources occupied by the equipment are released.

The lamp end can automatically monitor the voice packet reported by the terminal and transmit the optimized electric signal corresponding to the voice data reported by the communication terminal to other lamp ends in the local area network in the form of network packets. The lamp end also monitors network packets in the local area network automatically, and sends the network packets to the communication terminal in an optical signal mode.

After the lamp end receives the network access/offline or voice application of the communication terminal, the lamp end can also judge whether the channel resource meets the requirement or not, and send a response to the communication terminal according to the judging result.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

Further, the units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Furthermore, functional modules in various embodiments of the present application may be integrated together to form a single portion, or each module may exist alone, or two or more modules may be integrated to form a single portion.

It should be noted that the functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. The storage medium includes a U disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

In this document, 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.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A visible light communication system, characterized in that the communication system includes multiple communication terminals and multiple lamp terminals, the communication terminals including a first visible light receiver, a first visible light transmitter, and a first control board, and the lamp terminals including a second visible light receiver, a second visible light transmitter, and a second control board. The first visible light receiver and the second visible light receiver each include a distance optimization receiving module, an angle optimization receiving module and a merging module. The receiving end of the distance optimization receiving module receives the first visible light signal illuminated at multiple angles, generates a first electrical signal, and sends the first electrical signal to the first receiving end of the merging module through the output end; The receiving end of the angle optimization receiving module receives the first visible light signal, generates a second electrical signal, and sends the second electrical signal to the second receiving end of the merging module through the output end; The merging module merges the received first electrical signal and the second electrical signal to generate an optimized electrical signal, which is sent to the visible light receiving pin of the first control board/second control board through the output end, so that the first control board/second control board performs corresponding processing steps according to the optimized electrical signal. 2. The system according to claim 1 is characterized in that the distance optimization receiving module includes a convex lens and a first photodiode, wherein the convex lens is arranged at a first opening on the shell surface of the communication terminal and forms a first accommodating space with the shell, and the first photodiode is arranged in the first accommodating space and is located at the focus of the convex lens. 3. The system according to claim 1 is characterized in that the angle-optimized receiving module includes a plane light-transmitting mirror and a second photodiode, wherein the plane light-transmitting mirror is arranged at a second opening on the shell surface of the communication terminal and forms a second accommodation space with the shell, and the second photodiode is arranged in the second accommodation space and is located on the central axis of the plane light-transmitting mirror. 4. The system according to claim 1, wherein the communication terminal further comprises a voice receiver, the first control board comprises a main control chip and a voice processing chip connected to each other, the voice receiver is connected to the voice processing chip, the first visible light emitter comprises a third photodiode, the third photodiode is connected to the main control chip, The voice receiver receives the voice of the holder of the communication terminal, generates an analog signal and sends it to the voice processing chip; The voice processing chip processes the received analog signal into a digital signal and sends it to the main control chip; The main control chip drives the third photodiode based on the received digital signal to emit a first visible light signal. 5. The system according to claim 4, wherein the network ports of the second control boards of the multiple lamp terminals are connected by network cables to form a local area network. 6. The system according to claim 5, wherein after receiving the first visible light signal, the second visible light receiver at the target lamp end sends the optimized electrical signal to the second control board at the other lamp end via the local area network; The second control boards at other lamp ends each generate a corresponding second visible light signal according to the optimized electrical signal, and transmit it through the second visible light transmitter, so that the first visible light receiver of the communication terminal receives the second visible light signal at different positions. 7. The system according to claim 6, wherein the communication terminal further comprises a voice player, and the first visible light signal is used to indicate the audio data collected by the voice receiver, the terminal identifier and the channel identifier of the communication terminal, After receiving the optimized electrical signal corresponding to the first visible light signal, the main control chip received by the communication terminal determines whether the terminal identifier and channel identifier indicated by the first visible light signal have passed verification; If the verification is passed, the corresponding audio data will be played through the voice player. 8. The system according to claim 4, wherein the communication terminal further comprises a display, and the display is used to display the channel identification of the terminal device. 9. The system according to claim 4, wherein the communication terminal further comprises a communication button. The main control chip responds to the communication signal triggered by the communication button and controls the voice receiver to start collecting sound. 10. The system according to claim 7, wherein after the second visible light receiver of the target lamp end receives the first visible light signal, it sends the optimized electrical signal to the second control boards of all other lamp ends under the current channel identifier through the local area network.