Underwater wireless optical communication base station device and system for simultaneous access of multiple users

Abstract

The invention discloses an underwater wireless optical communication base station device and system for simultaneous access of multiple users. The base station device comprises a multi-surface structural body, a plurality of optical transmitting terminals, a plurality of optical receiving terminals and a core control module, the polyhedral structural body adopts a spherical convex polyhedron topological form and is a regular polyhedron or a semi-regular polyhedron; the plurality of light emitting terminals are arranged on each end surface of the multi-surface structural body; the plurality of light receiving terminals are arranged at the center of each end surface and each vertex of the multi-surface structure body; the light emitting terminals are uniformly distributed at the periphery of the light receiving terminal at the center of the end surface; the core control module is used for controlling signal transceiving and processing and is electrically connected with the light emitting terminal and the light receiving terminal. The base station device and the system can realize 360-degree omnidirectional optical information transceiving without tracking and aiming, and support real-time omnidirectional access of a plurality of wireless optical terminal users, thereby providing reliable technical support for real-time efficient networking between underwater mobile platforms.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical communication, and relates to underwater wireless optical communication technology, in particular to an underwater wireless optical communication base station device and system for multi-user simultaneous access. BACKGROUND

[0002] Underwater wireless optical communication is a technology for underwater information transmission by using blue-green light waves as a carrier, and has the advantages of high rate, low delay, strong security and low cost. At present, it has become an important research direction in the field of underwater wireless communication.

[0003] When the existing underwater wireless optical communication system establishes a communication link, due to the directivity of the light beam, the information transmitting light beam must be kept within the receiving field of view of the optical receiver, and at the same time the optical receiver also needs to be within the light beam coverage range of the optical transmitter. The constraints of the transmitting and receiving caused by the directivity of the light beam make the existing underwater wireless optical communication only applicable to point-to-point communication scenarios.

[0004] In order to solve the problem of light beam alignment between communication terminals, the existing technology usually adopts methods such as light beam homogenization and expansion, complex tracking and sighting, or increasing the field of view angle of the receiver. However, although this method can improve the communication coverage range of point-to-point devices to a certain extent, it still cannot effectively solve the alignment problem between mobile user terminals, and the problems of channel resource competition, poor alignment accuracy between devices, and low data transmission efficiency when multiple user terminals are interconnected.

[0005] How to ensure efficient, stable and real-time interconnection and intercommunication between multiple mobile user terminals (clients) under different underwater channel network conditions still lacks mature and effective solutions. SUMMARY

[0006] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide an underwater wireless optical communication base station device and system for multi-user simultaneous access, which supports multi-user real-time omnidirectional access without tracking. This base station device and system can realize 360° omnidirectional light information transmission and reception without tracking, and support real-time omnidirectional access of multiple wireless optical terminal users, thereby providing reliable technical support for real-time and efficient networking between underwater mobile platforms.

[0007] The technical solution for achieving the purpose of the present application is: An underwater wireless optical communication base station device for multi-user simultaneous access, comprising A multi-faceted structure, which adopts a convex polyhedral topology in the form of a spherical shape, and the multi-faceted structure is a regular polyhedron or a semi-regular polyhedron; A plurality of optical transmitting terminals arranged on each end face of the multi-faceted structure; a plurality of light receiving terminals arranged at the center of each end face and each vertex of the multi-faceted structure; the light emitting terminals are uniformly distributed on the periphery of the light receiving terminals at the center of the end face; a sealing lens, which functions as a waterproof seal, covers the surface of the multi-faceted structure as an optical window; a core control module for controlling signal transceiving and processing, which is electrically connected to the light emitting terminals and the light receiving terminals; Each light receiving terminal and light emitting terminal can be controlled individually.

[0008] Further, a cabin is arranged for accommodating the core control module and the power supply module.

[0009] Further, each light emitting terminal comprises a light source driving module, an emitting light source and an optical antenna, the light source driving module is electrically connected to the emitting light source, and the optical antenna is coupled to the emitting light source; the light source driving module is electrically connected to the core control module.

[0010] Further, each light receiving terminal comprises an optical antenna, a photodetector, a transimpedance amplification module and an analog-to-digital conversion module; the optical antenna is coupled to the photodetector, and the photodetector, the transimpedance amplification module and the analog-to-digital conversion module are sequentially electrically connected; the analog-to-digital conversion module is electrically connected to the core control module.

[0011] Further, when a regular polyhedral structure is adopted, the solid angle covered by the light beams emitted by each light emitting terminal is , and i represents the i-th face, and F represents the total number of faces.

[0012] Further, when a semi-regular polyhedral structure is adopted, the number of shapes of the regular polygons constituting the polyhedron is S, S = 2 or 3; S = 2, corresponding to two kinds of end faces, which are α end faces and β end faces; the number of faces corresponding to the α end faces is , the number of faces corresponding to the β end faces is , and ; the solid angle covered by the light beams emitted by each light emitting terminal on each α end face is ; the solid angle covered by the light beams emitted by each light emitting terminal on each β end face is , satisfying ; S = 3, corresponding to three kinds of end faces, which are α end faces, β end faces and γ end faces; the number of faces corresponding to the α end faces is , the number of faces corresponding to the β end faces is , the number of faces corresponding to the γ end faces is , and ; the solid angle covered by the light beams emitted by each light emitting terminal on each α end face is The solid angle covered by the light beam emitted from each light-emitting terminal on the β end face is... The solid angle covered by the light beam emitted from the light-emitting terminal on each γ end face is... ,satisfy .

[0013] Furthermore, when a regular polyhedral structure is used, the field of view of the optical receiving terminal on each end face covers a solid angle. , Indicates the first F represents the total number of faces; the field of view of the light receiving terminal at each vertex covers a solid angle. and j D Indicates the j-th D V represents the total number of vertices.

[0014] Furthermore, when a semi-regular polyhedron structure is adopted, the number of shapes of the polyhedral regular polygons constituting the polyhedron is S, where S = 2 or 3; S=2 corresponds to two types of end faces: α end face and β end face; the number of faces corresponding to α end face is... The number of faces corresponding to the β end face is ,and The field of view of the optical receiving terminal on each α end face covers a solid angle. The field of view of the optical receiving terminal on each β end face covers a solid angle. The field of view of the light receiving terminal at each vertex covers a solid angle. ,satisfy k D Indicates the kth D One vertex; S=3, corresponding to three types of end faces: α end face, β end face, and γ end face; the number of faces corresponding to the α end face is... The number of faces corresponding to the β end face is The number of faces corresponding to the γ end face is ,and The field of view of the optical receiving terminal on each α end face covers a solid angle. The field of view of the optical receiving terminal on each β end face covers a solid angle. The field of view of the light receiving terminal on each γ end face covers a solid angle. The field of view of the light receiving terminal at each vertex covers a solid angle. ,satisfy , l D Indicates the lth D One vertex.

[0015] An underwater wireless optical communication base station system for multiple users to access simultaneously, comprising The underwater wireless optical communication base station device described above; Multiple client devices; The base station device receives optical signals in different directions through multiple optical receiving terminals simultaneously, receives signals from the client, determines the orientation of the target client, and then controls the optical transmitting terminal in the corresponding orientation to send optical signals to the target client; If the orientation of the target client cannot be determined, all optical transmitting terminals will send optical signals omnidirectionally.

[0016] The process of the underwater wireless optical communication base station device receiving and sending multiple user optical information is as follows: The information receiving process of the underwater wireless optical communication base station device: Each end face and vertex of the multi-faceted structure of the underwater wireless optical communication base station device is equipped with an optical receiving terminal, which can receive optical signals at multiple angles through multiple optical receiving terminals; the photodetector and transimpedance amplification module in the optical receiving terminal convert the received optical signals into electrical signals, the analog-to-digital conversion module samples the electrical signals output by the transimpedance amplification module and uploads the data to the core control module for demodulation processing; each optical receiving terminal can operate and be controlled independently, and multiple optical receiving terminals can receive optical signals from different directions simultaneously; the core control module analyzes the optical signals received by multiple optical receiving terminals to determine the location information of the client, providing accurate positioning support for subsequent information transmission to the client; The data sending process of the underwater wireless optical communication base station device: The core control module of the underwater wireless optical communication base station divides the data to be sent into packets and encapsulates them into data frames; the header of the data frame contains the length, type, address, and error control information of the data frame; the core control module analyzes the optical signals received by multiple optical receiving terminals to determine the location information of the client; if the orientation of the target client can be determined, the modulated information is transmitted to the optical transmitting terminal in the corresponding orientation to send optical signals to the target client; in this way, different optical transmitting terminals can send optical signals to different clients, realizing real-time omnidirectional access of multiple wireless optical terminal users; if the orientation of the target client cannot be determined, the modulated information is transmitted to all optical transmitting terminals for omnidirectional sending of optical signals, ensuring that the target client can receive optical signals.

[0017] Technical features and significant effects of the present application: (1) The application adopts a spherical convex polyhedron transceiver array design, a plurality of light receiving terminals are arranged on the end face and vertex of the regular polyhedron or semi-regular polyhedron, and a plurality of light emitting terminals are arranged on the end face. According to the structure form of the regular polyhedron or semi-regular polyhedron adopted, the light beam emitting angle of the light emitting terminal and the receiving field angle of the light receiving terminal are designed, the seamless and uniform coverage of 360° omnidirectional light information receiving and transmitting without tracking is realized, the problems of communication quality decline, signal loss and information transmission delay caused by the traditional underwater wireless optical communication terminal machine unable to effectively track in the high dynamic and strong scattering underwater environment are fundamentally solved, and the stability and reliability of the underwater wireless optical communication system are improved.

[0018] (2) Each light receiving terminal and light emitting terminal of the application can be independently operated and individually controlled. Multiple independent light receiving terminals can simultaneously receive light signals from different directions, and the core control module can determine the position information of the client by analyzing the light signals received by the multiple light receiving terminals; after determining the position of the target client, the core control module controls the light emitting terminal in the corresponding direction to send light signals to the target client. In this way, different light emitting terminals can send light signals to different clients, realizing real-time omnidirectional access of multiple wireless optical terminal users in a high dynamic and strong scattering underwater environment, and providing technical support for real-time and efficient networking between underwater mobile platforms. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Figure 1 is a structural schematic diagram of a sixteen-face semi-omnidirectional underwater wireless optical communication base station device in embodiment 1 of the application; Figure 2 Figure 2 is a half-section structural schematic diagram of the sixteen-face semi-omnidirectional underwater wireless optical communication base station device in embodiment 1 of the application; Figure 3 Figure 3 is a structural schematic diagram of the sixteen-face semi-omnidirectional underwater wireless optical communication base station device in embodiment 1 of the application without a sealing lens; Figure 4 Figure 4 is a structural schematic diagram of a thirty-two-face omnidirectional underwater wireless optical communication base station device in embodiment 2 of the application; Figure 5 Figure 5 is a block schematic diagram of a multi-user simultaneous access oriented underwater wireless optical communication base station system in embodiment 1 / 2 of the application.

[0020] In the figure, 1. light receiving terminal 2. light emitting terminal 3. sealing lens 4. cabin 5. truncated thirty-two-face polyhedron 6. thirty-two-face polyhedron. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: like Figures 1-3 As shown, an underwater wireless optical communication base station device for simultaneous access by multiple users is a sixteen-and-a-half-sided omnidirectional underwater wireless optical communication base station device, including a truncated thirteen-dodecahedron 5, multiple optical transmitting terminals 2, multiple optical receiving terminals 1, a sealed lens 3, a cabin 4, and a core control module. Multiple optical emission terminals 2 are disposed on each end face of a halved dodecahedron 5; Multiple optical receiving terminals 1 are disposed at the center of each end face and at each vertex of the truncated dodecahedron 5; the optical transmitting terminals 2 are evenly distributed around the optical receiving terminals 1 at the center of the end face; The sealing lens 3 is an optical water-sealing lens, which serves to waterproof and seal the surface of the truncated dodecahedron 5 as an optical window.

[0023] like Figure 5 As shown, the optical receiving terminal 1 includes an optical antenna, a photodetector, a transimpedance amplifier module, and an analog-to-digital converter module; the optical antenna is coupled to the photodetector, and the photodetector, the transimpedance amplifier module, and the analog-to-digital converter module are electrically connected in sequence; the analog-to-digital converter module is electrically connected to the core control module. The photodetector is a photodiode (PIN), a photomultiplier tube (PMT), or an avalanche photodiode (APD). The photodetector works in conjunction with the transimpedance amplifier module to convert the received optical signal into an electrical signal. Subsequently, the analog-to-digital converter module samples the electrical signal output by the transimpedance amplifier module and uploads the data to the core control module for demodulation and subsequent signal processing.

[0024] Each optical receiving terminal is connected to the core control module and can be controlled and operated independently, enabling multiple optical receiving terminals to simultaneously receive optical signals from different directions.

[0025] The optical transmitting terminal 2 includes a light source driving module, a transmitting light source, and an optical antenna. The light source driving module is electrically connected to the transmitting light source, and the optical antenna is coupled to the transmitting light source. The light source driving module is electrically connected to the core control module.

[0026] The light source of the light emitting terminal 2 is an LED, a laser diode or a laser, etc. Each light emitting terminal 2 is connected with the core control module and can be controlled and operated independently, and can realize that different light emitting terminals send different light signals to different client terminals.

[0027] The core control module is responsible for real-time management of the cooperative work of the plurality of light receiving terminals and light emitting terminals, and ensures that the terminals can communicate efficiently in a complex underwater environment.

[0028] Each light receiving terminal and light emitting terminal can be controlled independently, and each terminal has a unique number.

[0029] As shown in Figure 5 , the core control module includes a programmable processor. The model of the programmable processor is EP4CE115 chip, which is a FPGA (Field Programmable Gate Array) chip. A plurality of output IO ports of the programmable processor are electrically connected with a light source driving module of the light emitting terminal 2. A plurality of input IO ports are electrically connected with an analog-digital conversion module of the light receiving terminal 1.

[0030] A power management module is provided for voltage conversion, and provides a plurality of isolated power supplies for the light emitting terminal 2, the light receiving terminal 1 and the programmable processor, to ensure the normal operation of each module. The programmable processor is responsible for data packeting and packaging, implementation of communication protocol and operation of control algorithm.

[0031] Each end face of the truncated icosahedron 5 is a single-face transceiver module, and each single-face transceiver module includes a light emitting terminal and a light receiving terminal arranged on the end face.

[0032] The cabin body 4 adopts a cylindrical structure and is installed at the bottom of the truncated icosahedron 5. The sealed lens 3 covers the optical window on the surface of the truncated icosahedron 5, and the sealed lens 3 has the dual functions of waterproof sealing and optical antenna, effectively ensuring the stable operation of the optical base station system in the underwater environment.

[0033] As shown in Figures 1-3 , in this example, the truncated icosahedron 5 has a total of six regular pentagons, five regular hexagons and five trapezoids, and thirty vertices.

[0034] The solid angle covered by the light beam emitted by the light emitting terminal 2 on the regular pentagonal end face is , the solid angle covered by the light beam emitted by the light emitting terminal 2 on the regular hexagonal end face is , and the solid angle covered by the light beam emitted by the light emitting terminal 2 on the trapezoidal end face is .

[0035] The sum of the solid angles covered by the light beams emitted by the light emitting terminals 2 on the truncated icosahedron 5 is The field of view of the optical receiving terminal 1 on the regular pentagonal end face covers a solid angle of 1. The field of view of the optical receiving terminal 1 on the hexagonal end face covers a solid angle of 1. The field of view of the optical receiving terminal 1 on the trapezoidal end face covers a solid angle of 1. The field of view of the light receiving terminal 1 at the vertex covers a solid angle of 1. .

[0036] The sum of the solid angles covered by the field of view of the optical receiving terminal 1 on the truncated dodecahedron 5 is: .

[0037] This sixteen-sided semi-omnidirectional underwater wireless optical communication base station device can achieve seamless and uniform coverage for semi-omnidirectional optical information transmission and reception.

[0038] Example 2: like Figure 4 As shown, an underwater wireless optical communication base station device for simultaneous access by multiple users is a 32-sided omnidirectional underwater wireless optical communication base station device, including a 32-sided polyhedron 6, multiple optical transmitting terminals 2, multiple optical receiving terminals 1, a sealed lens 3, and a core control module. Multiple optical emission terminals 2 are disposed on each end face of the dodecahedron 6; Multiple optical receiving terminals 1 are disposed at the center of each end face and at each vertex of the dodecahedron 6; the optical transmitting terminals 2 are evenly distributed around the optical receiving terminals 1 at the center of the end face; The optical receiving terminal 1 and optical transmitting terminal 2 are the same as in Embodiment 1; The core control module and power management module are the same as in Example 1.

[0039] The cabin is completely integrated within the interior of a full 32-sided polyhedron 6, forming an invisible, concealed installation. This design ensures the reliable fixation of critical components such as the core control module and power management module, while also adapting to different application scenarios through differentiated cabin layouts. Similarly, sealed lenses cover the optical windows on the surface of the 32-sided polyhedron 6.

[0040] In this example, the thirteenthodohedron 6 has a total of twelve regular pentagons and twenty equilateral triangles, with thirty vertices.

[0041] The solid angle covered by the light beam emitted by the light-emitting terminal 2 on the regular pentagonal end face is... The solid angle covered by the light beam emitted by the light-emitting terminal 2 on the equilateral triangular end face is . The sum of the solid angles covered by the light beam emitted by the light-emitting terminal 2 on the dodecahedron 6 is... The field of view of the optical receiving terminal 1 on the regular pentagonal end face covers a solid angle of 1. , a solid angle covered by the field of view angle of the light receiving terminal 1 on the equilateral triangle end face is , a solid angle covered by the field of view angle of the light receiving terminal 1 on the vertex is .

[0042] The sum of the solid angles covered by the field of view angle of the light receiving terminal 1 on the icosahedron 6 is .

[0043] This icosahedral omnidirectional underwater wireless optical communication base station device can realize seamless and uniform coverage of omnidirectional optical information transmission and reception.

[0044] Embodiment 3: As shown in Figure 5 , an underwater wireless optical communication base station system facing simultaneous access of multiple users includes the underwater wireless optical communication base station device of embodiment 1 or embodiment 2, and multiple client devices of client A-client N; The following is the working process of the underwater wireless optical communication base station device to determine the client position information by analyzing the optical signals received by multiple light receiving terminals, and to control the corresponding light emitting terminals to send optical signals: The light receiving terminals at different positions are each provided with a unique number; the light receiving terminal uploads the sampled data to the core control module, and the core control module demodulates and processes the data; the core control module extracts the number of the light receiving terminal and the signal amplitude information received by analyzing the uploaded data; based on the number information, the core control module can determine the specific position of the light receiving terminal, and further infer the direction of the client sending the optical signal; at the same time, according to the received signal amplitude information, the core control module estimates the strength of the received optical signal, and further calculates the distance between the client sending the optical signal and the underwater wireless optical communication base station device; by combining the direction and the distance, the core control module can roughly determine the position information of the client; The light emitting terminals at different positions also have unique numbers; when the underwater wireless optical communication base station device sends data to the client, if the core control module masters the position information of the target client, it controls the corresponding numbered light emitting terminal to send optical signals directionally; if the specific direction of the target client cannot be determined, the core control module controls all light emitting terminals to send optical signals omnidirectionally, ensuring that the target client can receive the signals.

[0045] In this way, different light emitting terminals can send optical signals to different clients, realizing real-time omnidirectional access of multiple wireless optical terminal users in a high-dynamic and strong-scattering underwater environment, and providing technical support for real-time and efficient networking between underwater mobile platforms.

[0046] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. An underwater wireless optical communication base station device for multi-user simultaneous access, characterized by, Comprising A multi-faceted structure in the form of a convex polyhedron with a topology of a spheroid, the multi-faceted structure being a regular polyhedron or a semi-regular polyhedron; A plurality of light emitting terminals arranged on each end face of the multi-faceted structure; A plurality of light receiving terminals arranged on the center of each end face and each vertex of the multi-faceted structure; the light emitting terminals are uniformly distributed on the periphery of the light receiving terminals in the center of the end face; A core control module for controlling signal transceiving and processing, which is electrically connected with the light emitting terminals and the light receiving terminals; Each of the light receiving terminals and the light emitting terminals can be controlled individually. 2.The multi-user simultaneous access oriented underwater wireless optical communication base station device according to claim 1, wherein, A sealed lens for waterproof sealing, which covers the surface of the multi-faceted structure as an optical window. 3.The underwater wireless optical communication base station device for multi-user simultaneous access of claim 1, wherein Each light emitting terminal comprises a light source driving module, a light emitting source and an optical antenna, the light source driving module is electrically connected with the light emitting source, and the optical antenna is coupled with the light emitting source; the light source driving module is electrically connected with the core control module. 4.The underwater wireless optical communication base station device for multi-user simultaneous access of claim 1, wherein Each light receiving terminal comprises an optical antenna, a photodetector, a transimpedance amplification module and an analog-to-digital conversion module; the optical antenna is coupled with the photodetector, and the photodetector, the transimpedance amplification module and the analog-to-digital conversion module are sequentially electrically connected; the analog-to-digital conversion module is electrically connected with the core control module. 5.The underwater wireless optical communication base station device for multi-user simultaneous access of claim 1, wherein, A cabin for accommodating the core control module and a power supply module. 6.The multi-user simultaneous access oriented underwater wireless optical communication base station device according to claim 1, wherein, When a regular polyhedral structure is adopted, the solid angle covered by the light beams emitted by each light emitting terminal is , and , i represents the i-th face, and F represents the total number of faces. 7.The multi-user simultaneous access oriented underwater wireless optical communication base station device according to claim 1, wherein, When a semi-regular polyhedron structure is adopted, the number of regular polygon shapes of the polyhedral angle constituting the polyhedron is S, S = 2 or 3; S=2, corresponding to two end faces, respectively, an alpha end face and a beta end face; the number of faces corresponding to the alpha end face is , the number of faces corresponding to the beta end face is , and , F represents the total number of faces; The solid angle covered by the light beams emitted by the light emitting terminals on each α end face is ; the solid angle covered by the light beams emitted by the light emitting terminals on each β end face is , satisfying ; S=3, corresponding to three end faces, respectively, an alpha end face, a beta end face and a gamma end face; the number of faces corresponding to the alpha end face is , the number of faces corresponding to the beta end face is , the number of faces corresponding to the gamma end face is , and ; The solid angle covered by the light beams emitted by the light emitting terminals on each α end face is ; and the solid angle covered by the light beams emitted by the light emitting terminals on each β end face is ; The solid angle covered by the light beams emitted by each light emitting terminal on the γ end face is , satisfying . 8.The underwater wireless optical communication base station device for multi-user simultaneous access of claim 1, wherein, When a regular polyhedral structure is adopted, the field of view of the light receiving terminal on each end surface covers a solid angle , denotes the th face, F denotes the total number of faces; the field of view of the light receiving terminal on each vertex covers a solid angle and , j D denotes the D th vertex, V denotes the total number of vertices. 9.The underwater wireless optical communication base station device for multi-user simultaneous access of claim 1, wherein, When a semi-regular polyhedron structure is adopted, the number of regular polygon shapes of the polyhedral angle constituting the polyhedron is S, S = 2 or 3; S=2, corresponding to two end faces, respectively, an alpha end face and a beta end face; the number of faces corresponding to the alpha end face is , the number of faces corresponding to the beta end face is , and , F represents the total number of faces; a solid angle covered by the field of view angle of the light receiving terminal on each of the α end faces a solid angle covered by the field of view angle of the light receiving terminal on each of the β end faces a solid angle covered by the field of view angle of the light receiving terminal on each of the vertices , satisfies , k D represents the k D th vertex, and V represents the total number of vertices S=3, corresponding to three end faces, respectively, an alpha end face, a beta end face and a gamma end face; the number of faces corresponding to the alpha end face is , the number of faces corresponding to the beta end face is , the number of faces corresponding to the gamma end face is , and ; a solid angle covered by the field of view angle of the light receiving terminal on each of the α end faces a solid angle covered by the field of view angle of the light receiving terminal on each of the β end faces a solid angle covered by the field of view angle of the light receiving terminal on each of the γ end faces a solid angle covered by the field of view angle of the light receiving terminal on each of the vertices , satisfies , l D denotes the l D th vertex.

10. A multi-user simultaneous access oriented underwater wireless optical communication base station system, characterized by, Comprising The underwater wireless optical communication base station device of any one of claims 1-9; A plurality of client devices; The base station device simultaneously receives light signals in different directions through a plurality of light receiving terminals, receives signals of a target client, determines the direction of the target client, and then controls the light emitting terminals in the corresponding direction to send light signals to the target client in a directional manner; If the direction of the target client cannot be determined, all light emitting terminals send light signals in an omnidirectional manner.

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