阅读说明：本技术 一种速率可调且距离可变的水下蓝绿光通信系统 (Speed-adjustable and distance-variable underwater blue-green light communication system ) 是由 江桂英 陈思井 肖云 周金荣 费礼 李亚平 文柯 吴夏颖 万梓傲 宫鹏飞 于 2021-08-25 设计创作，主要内容包括：本申请公开了一种速率可调且距离可变的水下蓝绿光通信系统,该系统为收发一体结构,包括发射光源、调制电路、聚光透镜、接收光学组件和信号处理组件；发射光源包括LD光源和由若干LED光源组合而成的LED阵列光源。每个LED光源由独立开关进行控制；调制电路控制发射光源输出不同类型或功率的光信号；聚光透镜与发射光源通过空间光路连接,对发射光源输出的光信号进行汇聚和准直；以及,接收邻居节点发出的光信号并进行汇聚；接收光学组件设置在发射光源远离聚光透镜的一侧；信号处理组件将光信号转换为电信号并恢复出原始数据；本发明满足近距离和远距离的光能量要求以及低速率和高速率的速率可变要求,能够有效实现通信双方的对准。(The application discloses an underwater blue-green light communication system with adjustable speed and variable distance, which is a receiving and transmitting integrated structure and comprises a transmitting light source, a modulation circuit, a condensing lens, a receiving optical assembly and a signal processing assembly; the emission light source comprises an LD light source and an LED array light source formed by combining a plurality of LED light sources. Each LED light source is controlled by an independent switch; the modulation circuit controls the emission light source to output optical signals of different types or powers; the condensing lens is connected with the emission light source through a spatial light path and used for converging and collimating optical signals output by the emission light source; receiving and converging optical signals sent by the neighbor nodes; the receiving optical assembly is arranged on one side of the transmitting light source, which is far away from the condensing lens; the signal processing assembly converts the optical signal into an electric signal and restores original data; the invention meets the requirements of short-distance and long-distance light energy and the variable speed requirements of low speed and high speed, and can effectively realize the alignment of both communication parties.)

1. An underwater blue-green light communication system with adjustable speed and variable distance is characterized in that the system adopts a double-light-source transceiving integrated structure and comprises a transmitting light source, a modulation circuit, a condensing lens, a receiving optical component and a signal processing component;

the emission light source comprises an LD light source and an LED array light source; the LED array light source is formed by combining a plurality of LED light sources, and each LED light source is controlled by an independent switch so as to realize power modulation of an output optical signal; the LD light source and the LED light source are distributed annularly, so that the emitting light source forms a hollow annular structure;

the modulation circuit is electrically connected with the emission light source and is used for controlling the emission light source to output optical signals of different types or different powers;

the condensing lens is connected with the emission light source through a spatial light path and is used for converging and collimating optical signals output by the emission light source and then emitting the optical signals; receiving and converging optical signals sent by the neighbor nodes;

the receiving optical assembly is arranged on one side of the transmitting light source, which is far away from the condensing lens, the end part of the receiving optical assembly extends into the annular structure of the transmitting light source, is connected with the condensing lens through a space light path and is used for detecting an optical signal received and converged by the condensing lens;

the signal processing assembly converts the optical signal output by the receiving optical assembly into an electric signal and restores original data.

2. The underwater blue-green light communication system with adjustable rate and variable distance according to claim 1, wherein the modulation circuit modulates the light signal output by the emission light source, specifically:

when the communication distance is not larger than the first distance, the modulation circuit controls the LED array light source to output an optical signal with power matched with the communication distance to search the rough position of the neighbor node; then controlling an LD light source to output light signals to realize the alignment with the neighbor nodes, and obtaining the accurate positions of the neighbor nodes;

when the communication distance is greater than the first distance, the modulation circuit controls the LD light source to output the optical signal to realize the alignment with the neighbor node, and the accurate position of the neighbor node is obtained.

3. The adjustable rate variable, variable distance underwater blue-green optical communication system of claim 1 in which the modulation circuit and signal processing components are disposed on the same printed circuit board or separately on different printed circuit boards.

4. The underwater blue-green light communication system with adjustable speed and variable distance as claimed in claim 1, wherein the front end of the LED array light source is provided with a reflective cup for adjusting the divergence angle of the output light beam of each LED light source.

5. The adjustable rate variable and variable distance underwater blue-green optical communication system of claim 1 wherein said receiving optical assembly includes a variable optical attenuator and a photodetector;

the variable optical attenuator is used for adjusting the power of the optical signal received and converged by the condenser lens according to the detection range of the photoelectric detector;

the photoelectric detector is used for detecting the optical signal output by the variable optical attenuator and converting the optical signal into an electric signal.

6. The underwater blue-green optical communication system with adjustable rate and variable distance as claimed in claim 5, wherein an optical filter is disposed between the variable optical attenuator and the optical detector for filtering the optical signal outputted from the variable optical attenuator.

7. The adjustable rate variable and variable distance underwater blue-green optical communication system of claim 1, wherein said signal processing assembly includes a preprocessing circuit and a signal processor;

the preprocessing circuit is used for sampling, amplifying and filtering the electric signal output by the optical detector;

and the signal processor is used for recovering the electric signal output by the preprocessing circuit into original data and calculating the error rate.

8. The adjustable rate variable, variable distance underwater blue-green optical communication system of claim 1 further comprising an optical antenna disposed on a side of the condenser lens remote from the source of emitted light.

9. The underwater blue-green optical communication system with adjustable rate and variable distance according to claim 1, wherein the condenser lens is a fresnel lens.

10. The underwater blue-green light communication system with adjustable speed and variable distance as claimed in claim 4, wherein the detection range of the optical detector is-38 dBm to-78 dBm.

Technical Field

The application relates to the technical field of underwater wireless optical communication, in particular to an underwater blue-green light communication system with adjustable speed and variable distance.

Background

The existing underwater wireless communication modes are mainly divided into 3 types: underwater acoustic communication, radio frequency communication, and optical communication. By virtue of the advantages of long transmission distance, reliable performance and the like, underwater acoustic communication still occupies the dominant position of underwater wireless communication technology. However, since the available bandwidth of the sound wave is limited in the low frequency range of 20kHz, the transmission rate of the sound wave is limited to about tens of kb/s, and the sound wave has the defects of high time delay, narrow bandwidth, obvious multipath effect and the like. The radio frequency communication can realize the underwater communication with the speed of hundreds of kb/s, but because the skin effect exists during the underwater transmission, the energy can be attenuated rapidly, and the higher the frequency is, the faster the attenuation is, so the transmission distance is limited, and the radio frequency communication is only suitable for the short-distance communication of shallow water. Therefore, the underwater acoustic communication and the radio frequency communication cannot meet the requirements of high-speed and long-distance transmission at the same time.

Compared with sound and radio frequency signals, the light wave frequency is higher, the information bearing capacity is stronger, and the underwater data transmission with large capacity is easier to realize; moreover, the wireless optical communication has the characteristic of being not easily influenced by the change of seawater temperature and salinity, and has strong anti-jamming capability; furthermore, light waves have better directivity than sound waves. In optical communication, the wavelength of blue-green light is located the transmission window of water, and water is little to blue-green light's absorption coefficient for blue-green light communication can be in the relatively farther distance of transmission under water, can obtain higher transmission rate simultaneously. Therefore, underwater blue-green light communication is receiving wide attention.

Currently, underwater visible light communication is mainly divided into laser communication and visible light communication based on blue-green light LEDs. The laser communication power is large, the laser can be transmitted in a long distance underwater, but the problem of coherent flicker exists, the communication needs to be accurately aligned, and the difficulty is caused to actual operation and application. The underwater optical communication based on the blue-green light LED uses incoherent light, integrates the functions of illumination and communication, does not need strict alignment, and provides a scheme for realizing communication in motion. Therefore, the two communication modes have respective advantages and disadvantages, and cannot meet the requirements of adjustable underwater blue-green light communication speed and variable distance.

Disclosure of Invention

Aiming at least one defect or improvement requirement in the prior art, the invention provides an underwater blue-green light communication system with adjustable speed and variable distance, wherein an emitting unit adopts two light sources of an LED and an LD, so that the requirements of short-distance and long-distance light energy and the requirements of low speed and high speed on speed variation are met; meanwhile, the receiving unit adopts a high-sensitivity photomultiplier PMT detector to further improve the transmission distance of underwater wireless optical communication.

In order to achieve the above object, according to one aspect of the present invention, an underwater blue-green light communication system with adjustable speed and variable distance is provided, which adopts a dual light source transceiving integrated structure, and comprises a transmitting light source, a modulation circuit, a condensing lens, a receiving optical assembly and a signal processing assembly;

the emission light source comprises an LD light source and an LED array light source; the LED array light source is formed by combining a plurality of LED light sources, and each LED light source is controlled by an independent switch so as to realize power modulation of an output optical signal; the LD light source and the LED light source are distributed annularly, so that the emitting light source forms a hollow annular structure;

the modulation circuit is electrically connected with the emission light source and is used for controlling the emission light source to output optical signals of different types or different powers:

the condensing lens is connected with the emission light source through a spatial light path and is used for converging and collimating optical signals output by the emission light source and then emitting the optical signals; receiving and converging optical signals sent by the neighbor nodes;

the receiving optical assembly is arranged on one side of the transmitting light source, which is far away from the condensing lens, the end part of the receiving optical assembly extends into the annular structure of the transmitting light source, is connected with the condensing lens through a space light path and is used for detecting an optical signal received and converged by the condensing lens;

the signal processing assembly converts the optical signal output by the receiving optical assembly into an electric signal and restores the electric signal into original data.

Preferably, the above speed-adjustable and distance-variable underwater blue-green light communication system, the modulation circuit modulates the optical signal output by the emission light source, specifically:

when the communication distance is not larger than the first distance, the modulation circuit controls the LED array light source to output an optical signal with power matched with the communication distance to search the rough position of the neighbor node; then controlling an LD light source to output light signals to realize the alignment with the neighbor nodes, and obtaining the accurate positions of the neighbor nodes;

when the communication distance is greater than the first distance, the modulation circuit controls the LD light source to output the optical signal to realize the alignment with the neighbor node, and the accurate position of the neighbor node is obtained.

Preferably, in the underwater blue-green optical communication system with adjustable speed and variable distance, the modulation circuit and the signal processing module are arranged on the same printed circuit board or are separately arranged on different printed circuit boards.

Preferably, in the underwater blue-green light communication system with the adjustable speed and the variable distance, a reflective cup is arranged at the front end of each LED array light source and used for adjusting the divergence angle of the light beam output by each LED light source.

Preferably, in the underwater blue-green light communication system with adjustable speed and variable distance, the receiving optical assembly includes an adjustable optical attenuator and a photodetector;

the variable optical attenuator is used for adjusting the power of the optical signal received and converged by the condenser lens according to the detection range of the photoelectric detector;

the photoelectric detector is used for detecting the optical signal output by the variable optical attenuator and converting the optical signal into an electric signal.

Preferably, in the underwater blue-green light communication system with adjustable rate and variable distance, an optical filter is arranged between the adjustable optical attenuator and the optical detector, and is used for filtering the optical signal output by the adjustable optical attenuator.

Preferably, in the underwater blue-green light communication system with adjustable speed and variable distance, the signal processing module includes a preprocessing circuit and a signal processor;

the preprocessing circuit is used for sampling, amplifying and filtering the electric signal output by the optical detector;

and the signal processor is used for recovering the electric signal output by the preprocessing circuit into original data and calculating the error rate.

Preferably, the underwater blue-green light communication system with adjustable speed and variable distance further comprises an optical antenna, and the optical antenna is arranged on one side of the condensing lens, which is far away from the emission light source.

Preferably, in the underwater blue-green light communication system with adjustable speed and variable distance, the condensing lens is a fresnel lens.

Preferably, in the underwater blue-green light communication system with the adjustable speed and the variable distance, the detection range of the optical detector is-38 to-78 dBm.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

the underwater blue-green light communication system with adjustable speed and variable distance provided by the invention adopts two light sources of an LED and an LD at a transmitting end, wherein an LED array light source is formed by combining a plurality of LED light sources, each LED light source is controlled by an independent switch, and the power of an output light signal is modulated by selectively turning on different numbers of LED light sources, so that the requirements of short-distance and long-distance light energy and the requirements of low speed and high speed on speed variation are met; during communication, the LED light source with a large divergence angle is adopted to carry out neighbor search to find a nearby neighbor node, and then the LD light source is used to transmit signals to find the accurate position of the neighbor node. Therefore, the method and the device for finding the neighbor nodes by adopting the two light sources not only can easily find the neighbor nodes, but also can effectively realize the alignment and communication of the two parties. In structural design, a receiving and transmitting integrated structure is adopted, and the spatial structural relationship among a transmitting light source, a condensing lens, a receiving optical assembly, a modulation circuit and a signal processing assembly in the system is optimally designed, so that the system has the advantages of compactness and miniaturization.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an underwater blue-green light communication system with adjustable speed and variable distance according to this embodiment;

fig. 2 is a logic block diagram of an underwater blue-green light communication system with adjustable speed and variable distance according to this embodiment;

fig. 3 is a schematic circuit control diagram of the LED array light source provided in this embodiment;

fig. 4 is a schematic structural diagram of an emission light source provided in this embodiment;

fig. 5 is a schematic diagram of a light spot transmitted a certain distance by the emission light source provided in this embodiment.

Detailed Description

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

The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Fig. 1 is a schematic structural composition diagram of an underwater blue-green light communication system with adjustable speed and variable distance provided in this embodiment, and referring to fig. 1, the underwater blue-green light communication system is a transceiver integrated structure using dual light sources, and includes a transmitting light source 1, a modulation circuit, a condenser lens 2, a receiving optical component 3, and a signal processing component;

wherein the emission light source comprises a Laser Diode (LD) light source and a Light Emitting Diode (LED) array light source; the LED array light source is formed by combining a plurality of LED light sources, each LED light source is controlled by an independent switch, and the power of the output light signal is modulated by the on and serial (or serial-parallel) work of different numbers of LED light sources; in this embodiment, the number of the LED light sources constituting the LED array light source is not particularly limited, and mainly depends on the transmission distance of the underwater optical communication and the optical signal transmission power for achieving the required transmission distance. The LED light sources in the LED array light source can be connected in series or in a combination of series and parallel depending on the number of LED light sources. In addition, the specific arrangement of the Laser Diode (LD) light source and the Light Emitting Diode (LED) array light source is not particularly limited; as a preferred example, the LD light source and several LED light sources in the LED array light source are distributed in a ring shape, so that the emitting light source 1 forms a hollow ring-shaped structure; this structure can ensure the light emission uniformity of the emission light source and reduce the volume of the emission light source 1.

The modulation circuit is electrically connected with the emission light source and is mainly used for controlling the emission light source to output optical signals of different types or different powers, and specifically comprises the following steps:

when the communication distance is not larger than the first distance, the modulation circuit controls the LED array light source to output an optical signal with power matched with the communication distance to search for the rough position of the receiving end; then controlling an LD light source to output a light signal to realize alignment with a receiving end, and obtaining the accurate position of the receiving end;

when the communication distance is greater than the first distance, the modulation circuit controls the LD light source to output the optical signal to realize the alignment with the receiving end, and the accurate position of the receiving end is obtained;

in this embodiment, the first distance is a maximum transmission distance that can be reached when all LED light sources in the LED array light source operate on the premise that the power of the optical signal emitted by the emitting end satisfies the maximum power that can be successfully detected by the detector at the receiving end.

Specifically, in the near field communication, since the LD light source has a small emission spot, it is difficult to align both the transmitting and receiving sides. Therefore, the positions of the neighbor nodes can be searched by adopting the LED light source with the large divergence angle, and then the specific positions of the neighbor nodes can be found by adopting the LD light source to transmit signals. And after the handshake of the two parties is achieved, the underwater communication is started, and data information is transmitted. When the remote communication is carried out, the emitting light spot of the LD light source is larger, and the alignment of the receiving party and the transmitting party is easier to realize. Therefore, the LD light source can be directly adopted for neighbor search and communication.

Under the conditions that the distance between two communication parties is short and the requirement on the speed is not high, the LED light source with lower power consumption can be directly adopted for underwater communication so as to save the energy consumption of the underwater platform.

In an alternative embodiment, the front end of the LED array light source is provided with a reflective cup for adjusting the divergence angle of the output light beam of each LED light source.

The condensing lens 2 is connected with the emission light source 1 through a space light path and is mainly used for converging and collimating light beams. Because the invention provides a receiving and transmitting integrated underwater communication system, the condensing lens 2 is shared by a transmitting end and a receiving end through the design of a hardware structure; when the condenser lens 2 is used as a component of the transmitting end, the condenser lens is used for converging and collimating the optical signal output by the transmitting light source 1 and then transmitting the optical signal; when the condenser lens 2 is used as a component of a receiving end, the condenser lens is mainly used for receiving optical signals sent by neighboring nodes and converging the optical signals; in this embodiment, the condensing lens 2 adopts a fresnel lens to converge the outgoing light beam of the LED light source, so as to reduce the divergence angle of the light beam, and solve the problems of large divergence angle and energy dispersion of the LED light source. When the condenser lens 2 is used as a component of the receiving end, the fresnel lens uses a special optical principle to generate a "blind area" and a "high-sensitivity area" that are alternately changed in front of the receiving optical assembly 3, so as to improve the detection receiving sensitivity of the detector in the receiving optical assembly 3. When an optical pulse signal is present and is a peak value, the detector enters a high-sensitivity area, when the pulse is changed into a low level, the detector enters a blind area, the Fresnel lens is arranged at the front end of the detector, light rays can be converged, the communication distance is increased, and greater freedom is brought to design.

In the embodiment, the condensing lens 2 is used as a transmitting antenna and a receiving antenna at the same time, so that the system volume is favorably reduced, and the compact design is realized; in other alternative embodiments, an optical antenna may be additionally disposed at the front end (the end far from the emitting light source) of the condenser lens 2, and used as the emitting antenna and the receiving antenna.

The receiving optical component 3 is arranged on one side of the transmitting light source 1, which is far away from the condensing lens 2, the end part of the receiving optical component extends into the annular structure of the transmitting light source 1, is connected with the condensing lens 2 through a space light path, and is used for detecting the optical signal received and converged by the condensing lens 2;

the signal processing module converts the optical signal output from the receiving optical module 3 into an electrical signal and restores the original data.

With continued reference to fig. 1, the modulation circuitry and the signal processing components are disposed on the same printed circuit board 4, although it is possible to separately dispose the modulation circuitry and the signal processing components on different printed circuit boards 4.

The LED array light source is formed by combining a plurality of LED light sources, each LED light source is controlled by an independent switch, and the power of an output light signal can be modulated by selectively starting different numbers of LED light sources to enable the LED light sources to work in series or in series-parallel connection, so that the requirements of short-distance and long-distance light energy and the requirements of low speed and high speed rate variability are met; during communication, the LED light source with the larger divergence angle is adopted to carry out neighbor search to find out nearby neighbor nodes, and then the LD light source is used to transmit signals to find out the specific positions of the neighbor nodes. After the handshake of the two parties is ready, the two parties start to carry out the communication between the underwater nodes. Therefore, the method and the device for finding the neighbor nodes by adopting the two light sources are easier to realize, so that the alignment and the communication of the two parties are effectively realized. In structural design, a receiving and transmitting integrated structure is adopted, and the space structures among a transmitting light source, a condensing lens, a receiving optical assembly, a modulation circuit and a signal processing assembly in the system are optimally designed, so that the system has the advantages of compactness and miniaturization.

Fig. 2 is a logic block diagram of an underwater blue-green-light communication system with adjustable speed and variable distance provided by this embodiment, as shown in fig. 2, a receiving optical component 3 in the system includes a variable optical attenuator, an optical filter and a photodetector;

the adjustable optical attenuator is used for adjusting the power of the optical signal received and converged by the condenser lens according to the detection range of the photoelectric detector;

the optical filter is used for filtering the optical signal output by the adjustable optical attenuator.

The photoelectric detector is used for detecting the optical signal output by the variable optical attenuator and converting the optical signal into an electric signal; the detection range of the optical detector is as large as possible, and the transmission distance of underwater wireless optical communication can be further increased by adopting a high-sensitivity Photomultiplier (PMT) detector.

The signal processing assembly comprises a preprocessing circuit and a signal processor; the preprocessing circuit is used for sampling, amplifying and filtering the electric signal output by the optical detector; the signal processor is used for recovering the electric signal output by the preprocessing circuit into original data and calculating the error rate.

The following takes an example that the LED array light source includes 15 LED light sources, and further details the composition and the operation principle of the underwater blue-green light communication system with adjustable speed and variable distance provided by the present invention.

Fig. 3 is a schematic circuit control diagram of the LED array light source provided in this embodiment; referring to fig. 3, the LED array light source is of an array structure formed by 15 LED light sources, and the switch of each LED light source is independently controlled, so that the series control of 1-15 LED light sources can be realized.

Fig. 4 is a schematic structural diagram of an emission light source provided in this embodiment; the emitting light source is a double light source structure consisting of an LD light source and an LED array light source. The arrangement structure of the LED light sources in the LED array light source corresponds to the sequence from left to right in fig. 3, so as to ensure that each LED light source can be controlled individually.

The emitting end comprises a double light source (an LED light source and an LD light source) and a driving circuit thereof. The output light power of the LD light source is 10mW, the maximum output light power of the LED light source is 15W, the power is adjustable, and underwater optical communication with the variable distance of 10-300 meters can be realized. In the double-light source structure, the LD light source adopts a direct modulation mode, and is controlled by a non-return-to-zero on-off keying (NRZ-OOK) signal, and the highest modulation rate can reach 150 Mb/s; the LED light source also adopts an NRZ-OOK modulation mode, but the highest modulation rate is only 20Mb/s, so that the modulation rate of the light source can be adjusted to be 1-150M. The optical component consists of a variable optical attenuator, a reflecting cup and a condensing lens, so that the light beams are converged and collimated, and the divergence half angle of the light source is ensured to be 5 degrees.

And detecting the received signals by a PMT detector with a detectable range of-38 dBm to-78 dBm at a receiving end. The received light is converted into an electric signal by a PMT detector after passing through a condenser lens and an optical filter in sequence, and then the data is restored through a signal processing module after amplification and filtering processing, so that the error rate is calculated.

According to the characteristic, the output power of the LED array light source can be controlled within 1-15W to be adjusted. According to the link power budget results in table 1, it can be seen that 1 LED light source is adopted to emit light, and the optical power reaching the receiving end after 10 meters transmission is 8.96 dBm. Such that the intense light has exceeded the maximum detectable power of the PMT detector. Therefore, it is necessary to add an adjustable optical attenuator at the receiving end to ensure that the optical power reaching the PMT is within its detectable range to avoid damaging the device. Before the two parties of the transceiver start to communicate, the adjustable optical attenuator should be set to the maximum attenuation value, so as to avoid the damage of the device caused by the overlarge light intensity entering the PMT.

TABLE 1 Link Power budget Table

Fig. 5 is a schematic diagram of a light spot transmitted a certain distance by the emission light source provided in this embodiment; referring to fig. 5, the radius of the emitted light spot is H when the light source (with half angle of divergence θ) travels a distance L. According to the formula H ═ L × tan (θ), the spot size after the light source transmission distance L can be calculated.

As can be seen from the link power budget in table 1, when an LD light source is used as a communication light source, the divergence angle is small, so that the diameter of the emission light spot is small when the transmission distance is less than 300 meters, and thus, it is difficult to align both the transmitting and receiving parties with the small light spot. Therefore, during communication, the LED light source with a large divergence angle needs to be used to perform neighbor search to find a neighboring neighbor node, and then the LD light source is used to transmit a signal to find a specific position of the neighbor node. After the handshake of the two parties is ready, the two parties start to carry out the communication between the underwater nodes. Therefore, the invention adopts two light source modes, which is easier to realize the discovery of the neighbor node so as to effectively realize the alignment and communication of the two parties; under the condition that 15 LED light sources are adopted in the LED array light source, the maximum communication distance of the communication system provided by the invention can reach 300 m; theoretically, increasing the number of LED light sources, the maximum communication distance will increase.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.