Wide-viewing-angle array receiver and receiving method

Abstract

The invention provides a wide-view-angle array receiver and a receiving method. The wide-view-angle array receiver comprises a photoelectric detector array. The photoelectric detector array is composed of a carrier and a plurality of photoelectric detector array elements, and the receiving surfaces of the photoelectric detector array elements are curved surfaces; the photoelectric detector array elements are uniformly distributed on the surface of the carrier, and the receiving surfaces cooperatively enclose to form a spherical receiving end which is used for receiving incident light signals at different angles and converting the incident light signals into electric signals. According to the wide-view-angle array receiver and the receiving method, the defect that the view angle of a traditional plane receiving end is limited is overcome, comprehensive capturing of full-view-angle signals is achieved, and local view angle blind areas are effectively eliminated. Each array element can serve as an independent signal receiving channel, and parallel capture and transmission of incident light signals in multiple directions are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of visible light communication, in particular to a wide-view angle array receiver and a receiving method. BACKGROUND

[0002] In the mobile communication scenario, visible light communication and optical wireless communication become an important supplement to traditional wireless communication due to the core advantages of rich spectrum resources and no electromagnetic interference, but their large-scale application is always limited by the outstanding contradiction between the mobility of the receiving terminal and the receiving performance.

[0003] In actual mobile communication scenarios such as vehicle-mounted, unmanned aerial vehicle, handheld device, the receiving terminal is in a state of continuous movement, which causes the real-time dynamic change of the light incidence angle; and the traditional photoelectric receiving front end is limited by the field of view angle, when the incidence angle exceeds the field of view range, the optical gain drops sharply, directly causing the loss of light signal and the interruption of communication link, which seriously restricts the terminal moving range and communication continuity.

[0004] In order to break through the field of view angle limitation, the design method of spatial multiplexing type holographic array receiving antenna for visible light communication system is proposed in the Chinese invention patent with publication number CN104378158A, the invention method uses a holographic microlens array to replace the traditional catadioptric optical structure, determines the core parameters by light tracing method, optimizes the design by combining the curved surface K vector closure method, and expands the receiving field of view angle by using the diffraction principle of holographic optical element.

[0005] However, the above-mentioned scheme adopts the structure of single detector and multiple sub-holographic antennas, all direction signals are converged to a single detector, the transmission rate is limited by the response speed of the detector itself, lacks multi-channel parallel transmission capability, and cannot meet the demand of high speed of mobile communication.

[0006] In order to solve the above problems, people have been seeking an ideal technical solution. SUMMARY

[0007] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a wide-view angle array receiver and a receiving method which break through the receiving boundary limitation and adapt to the terminal movement characteristics.

[0008] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is: In a first aspect, the present application provides a wide-view angle array receiver applied to a visible light communication system, comprising a photoelectric detector array; The photoelectric detector array is composed of a carrier and a plurality of photoelectric detector elements, the receiving surface of the photoelectric detector element is a curved surface; each photoelectric detector element is uniformly arranged on the surface of the carrier, and each receiving surface cooperatively forms a spherical receiving end for receiving light signals of different angles.

[0009] By setting the receiving surface of the photodetector array element as a curved surface and uniformly arranging each array element to cooperatively form a spherical receiving end, the defect of limited view angle of the traditional planar receiving end is broken through, and comprehensive capture of light signals of different angles of incidence is realized. On the one hand, the structural design of the spherical receiving end enables the receiver to cover a wider receiving view angle without additional adjustment of the attitude, thereby improving the anti-interference ability of the visible light communication system, and is particularly suitable for mobile scenarios or communication scenarios of multiple directional light sources. On the other hand, compared with a planar receiving surface, the curved receiving surface can reduce the reflection loss of incident light, improve the coupling efficiency of light signals, and thus enhance the strength and stability of the received signals, thereby ensuring the communication quality. At the same time, the uniform arrangement of the array elements makes the signal receiving performance of each region of the receiving end balanced, avoiding local view angle blind area, and further improving the wide view angle receiving reliability of the receiver.

[0010] In a preferred technical solution, the carrier comprises a spherical or hemispherical support, and the surface of the support is pre-provided with a plurality of assembly holes for mounting the photodetector array elements.

[0011] The spherical or hemispherical support provides a stable and adaptive mounting basis for the uniform arrangement of the photodetector array elements and the formation of the spherical receiving end. Compared with irregular carriers, the curved surface of the spherical or hemispherical support has uniform curvature, which can ensure the spherical precision of the cooperatively enclosed receiving surfaces of the array elements, and further improve the uniformity of wide view angle receiving. The spherical or hemispherical structure itself has good mechanical stability, which can reduce the influence of vibration or impact generated by the external environment on the structure of the receiving array, and ensure the stable operation of the receiver in complex environments. In addition, the design of the pre-provided assembly holes realizes the standardized and modularized mounting of the photodetector array elements, which not only reduces the assembly difficulty and production cost, but also facilitates the subsequent maintenance, replacement or upgrading of the array elements, and improves the scalability of the receiver.

[0012] In a preferred technical solution, the photodetector array elements are distributed in a polyhedral manner on the surface of the support, and the polyhedral distribution includes truncated octahedron, regular dodecahedron, truncated dodecahedron, regular icosahedron, truncated icosahedron or icosahedron arrangement structure.

[0013] The polyhedral structures such as truncated octahedron and regular dodecahedron have the characteristics of high symmetry and uniform surface distribution, which can make the receiving ranges of the photodetector array elements connect with each other without overlapping and blind area, maximize the utilization of array space and improve the view angle coverage efficiency. Compared with random distribution or simple array distribution, this kind of polyhedral distribution can realize wider view angle coverage with the same number of array elements, or reduce the number of array elements under the same view angle coverage requirement, thereby reducing the equipment cost and energy consumption. At the same time, the symmetrical polyhedral distribution structure makes the signal receiving performance of the receiver more stable, avoids the problem of local signal being too strong or too weak caused by uneven distribution of array elements, and improves the stability and reliability of communication.

[0014] In a preferred technical solution, the photodetector array element comprises a PIN photodiode detector or an avalanche photodiode detector.

[0015] The PIN photodiode detector has the characteristics of fast response speed, low noise and moderate cost, and is suitable for visible light communication scenarios of general rate and conventional environment; the avalanche photodiode detector has the advantages of high gain and high sensitivity, and can effectively improve the detection capability of weak light signals, and is suitable for complex communication scenarios with long distance of light source and serious attenuation of light signals. The optional design of the two types of detectors enables the receiver to be flexibly configured according to different application scenarios, improving the universality and market applicability of the product; at the same time, both types of detectors are suitable for the visible light band and perfectly match the light source characteristics of the visible light communication system, which can ensure the accuracy and efficiency of signal detection.

[0016] In a preferred technical solution, the receiving field of view angle of the PIN photodiode detector is 12°, and the response wavelength band is 400-700 nm; the receiving angle of the photodetector array covers the range of 0°-180°.

[0017] The receiving field of view angle of 12° makes the single PIN photodiode array element have high direction selectivity, which can reduce the interference of stray light and improve the signal-to-noise ratio of the signal; the response wavelength band of 400-700 nm completely covers the commonly used wavelength band of visible light communication, such as the light-emitting wavelength band of LED light source, which ensures efficient response to the communication light signal and avoids signal loss caused by mismatched wavelength. The receiving angle coverage range of 0°-180° of the photodetector array directly meets the core requirement of the wide-view receiver, and can adapt to multi-directional and large-range visible light signal receiving scenarios, such as indoor multi-light source coverage and omnidirectional communication of mobile terminals; the combination of the narrow field of view of the single array element and the wide angle coverage of the array ensures the specificity of signal reception and realizes the comprehensiveness of the viewing angle, so that the receiver can still maintain good communication quality in complex visible light communication environment.

[0018] In a second aspect, the application provides a receiving method applied to the wide-view array receiver of the first aspect, comprising: collecting visible light signals of different incident angles by using the spherical receiving end of the wide-view array receiver, and converting the visible light signals of each incident angle into corresponding electrical signals; obtaining the visible light signal intensity incident on each photodetector array element in the wide-view array receiver and the corresponding incident angle information according to the electrical signals, and determining whether the current communication scenario is a non-aliasing scenario or an aliasing scenario; If it is determined that the current communication scenario is a non-overlapping scenario, a signal channel corresponding to a photodetector array element with the highest visible light signal strength is screened out, an electrical signal output by the signal channel is sequentially subjected to amplification and filtering processing, and the electrical signal subjected to the amplification and filtering processing is demodulated to recover original transmission data; If it is determined that the current communication scenario is an overlapping scenario, angle feature extraction and blind source separation processing are sequentially performed on the multiple superimposed electrical signals to obtain independent electrical signals of each channel, and each independent electrical signal is demodulated to recover original transmission data corresponding to each channel.

[0019] Relying on the spherical receiving end of the wide-view-angle array receiver, comprehensive collection of visible light signals with different incident angles can be realized, the problem of limited receiving angle and easy omission of edge angle signals of a traditional receiver is solved, and the coverage range and signal capture capability of the visible light communication system are improved. By distinguishing between non-overlapping and overlapping communication scenarios, differentiated signal processing strategies are adopted. In the non-overlapping scenario, the strongest signal channel is screened out for processing, which can reduce invalid signal interference, reduce processing energy consumption, and improve demodulation efficiency. In the overlapping scenario, angle feature extraction and blind source separation processing are performed, which can effectively separate the multiple superimposed signals and avoid data loss or errors caused by signal overlapping, thereby ensuring the data transmission reliability in complex communication environments.

[0020] In a preferred technical solution, the angle feature extraction and blind source separation processing performed on the multiple superimposed electrical signals to obtain independent electrical signals of each channel include: Collecting overlapping electrical signals superimposed in space to obtain a plurality of observation signals and form an observation signal matrix; Extracting incident angles of independent source signals corresponding to the overlapping electrical signals to photodetector array elements, selecting a trigonometric function, a Gaussian angle window or a directional response function as an angle weight function, and constructing a signal mixing matrix with angle weight in combination with a preset signal attenuation coefficient; Based on the signal mixing matrix and the observation signal matrix, a linear mixing model is constructed, and a blind separation processing is performed on the linear mixing model by using an independent component analysis algorithm to obtain independent electrical signals of each channel; An expression of an element of the signal mixing matrix is: ij =β ij •w(θ ij ); wherein w(θ ij ) represents an angle weight function, and β ij represents a signal attenuation coefficient; An expression of the linear mixing model is: x(t)=A﹒s(t); s(t)=[s1(t),s2(t),…s n (t)]T ; x(t) = [x1(t), x2(t), …, x m (t)] T ; where s j (t) represents an independent source signal, x i (t) represents an observation signal; A ∈ R m*n is a signal mixing matrix with angle weight.

[0021] The incident angle information is converted into an angle weight function through angle feature extraction, a mixing matrix is constructed in combination with a signal attenuation coefficient, the angle characteristics and loss law of signal propagation are accurately described, reliable prior information is provided for blind source separation, the separation ambiguity problem caused by the lack of scene characteristics in traditional blind separation algorithms is solved, and the separation accuracy of multi-path mixed signals is greatly improved. The angle weight function supports multiple types such as trigonometric function, Gaussian angle window, and can flexibly adapt to different visible light communication scenes such as direct reflection, diffuse reflection, and dynamic angle change; at the same time, the signal attenuation coefficient is integrated, the signal loss in long-distance transmission or complex environment is effectively compensated, and the robustness of the system in complex scenes such as multipath propagation and weak light is enhanced.

[0022] In one preferred technical solution, the judgment of the current communication scene as a non-mixed scene or a mixed scene includes: if the current communication process satisfies the Nyquist sampling condition and there is no false frequency component, it is determined as a non-mixed scene; if the current communication process does not satisfy the Nyquist sampling condition or there is a false frequency component, it is determined as a mixed scene.

[0023] The Nyquist sampling condition and the false frequency component are used to clearly judge the non-mixed scene and the mixed scene, avoid the scene misjudgment caused by the fuzzy judgment standard, and provide a reliable premise for the accurate implementation of the subsequent differentiated signal processing strategy. Without complex feature extraction or model training, the scene judgment can be quickly completed, the real-time transmission demand of visible light communication is adapted, the signal processing delay is reduced, and the real-time response capability of the system is improved.

[0024] In a third aspect, the present application provides a visible light communication system, comprising a transmitting end module and a receiving end module; The transmitting end module comprises a full resource transmission unit and an LED array transmitting unit, and the full resource transmission unit is electrically connected with the LED array transmitting unit; The full resource transmission unit is used for modulating and processing original data to be transmitted to generate optical signals meeting the transmission requirements; and the LED array transmitting unit is used for receiving the optical signals output by the full resource transmission unit and transmitting the optical signals outward in a full power or full bandwidth mode; The receiving end module comprises a wide-view-angle array receiver and a signal processing unit, and the wide-view-angle array receiver is electrically connected with the signal processing unit. The wide-view-angle array receiver is the wide-view-angle array receiver in any one of claims 1-5, used for receiving the optical signal sent by the LED array emitting unit and converting the optical signal into an electrical signal; and the signal processing unit is used for performing the receiving method in any one of claims 6-7 to demodulate the electrical signal output by the wide-view-angle array receiver and generate a corresponding digital signal.

[0025] The transmitting end transmits signals in a full-power or full-bandwidth mode, thereby improving the data transmission rate and distance; the receiving end relies on the wide-view-angle array receiver to realize omnidirectional signal capture, and the receiving method is matched, thereby solving the contradiction between the high transmission of the traditional visible light communication system and the limited receiving coverage and the weak anti-aliasing capability, and improving the overall communication performance of the system.

[0026] The present application has outstanding substantial features and significant progress compared with the prior art, in particular: (1) The receiving surface of the photodetector array element is designed as a curved surface, and the polyhedron is uniformly arranged based on a spherical or hemispherical support, and a spherical receiving end is formed by cooperation and enclosure, so that the receiving angle coverage range reaches 0°-180°, thereby breaking through the defect that the view angle of the traditional plane receiving end is limited.

[0027] (2) Each array element can be used as an independent signal receiving channel to realize parallel capture and transmission of multi-directional incident light signals; for the multi-channel signal aliasing problem, an angle weight function is further introduced to construct a signal mixing matrix with angle weight, and an independent component analysis algorithm is combined to complete accurate blind separation of the multi-channel superimposed signals, thereby ensuring accurate demodulation of each independent signal.

[0028] (3) The structure design of the spherical receiving end makes the receiver cover a wide visual angle without additional adjustment of the posture, adapts to the position and posture change requirements of the mobile terminal, and is especially suitable for a communication environment of a mobile scene or a multi-directional light source. The mechanical stability of the spherical or hemispherical support can reduce the influence of external vibration and impact on the receiving array, and guarantee stable work in a complex environment; and the optional configuration of the PIN photodiode and the avalanche photodiode can be flexibly selected according to the signal strength of different mobile scenes, and further improve the reliability and anti-interference ability of the mobile terminal communication. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the spherical receiving end of the application; Figure 2 is a schematic diagram of the support of the application; Figure 3 is a schematic diagram of the visible light communication system of the application. DETAILED DESCRIPTION

[0030] The technical solutions of the application will be further described in detail through specific embodiments.

[0031] Embodiment 1 As shown in Figures 1-2 , in the embodiment of the application, a wide visual angle array receiver is proposed, which is applied to a visible light communication system and includes a photodetector array. The photodetector array is composed of a carrier and a plurality of photodetector elements, and the receiving surface of each photodetector element is a curved surface; each photodetector element is uniformly arranged on the surface of the carrier, and each receiving surface cooperatively forms a spherical receiving end for receiving light signals of different angles and converting them into electrical signals.

[0032] In an optional embodiment, the carrier includes a support in the shape of a sphere or a hemisphere, and the surface of the support is pre-provided with a plurality of assembly holes for mounting the photodetector elements.

[0033] In an optional embodiment, the photodetector elements are distributed in a polyhedral shape on the surface of the support, and the polyhedral distribution includes truncated octahedron, regular dodecahedron, truncated dodecahedron, regular icosahedron, truncated icosahedron or icosahedron arrangement structure.

[0034] In an optional embodiment, the photodetector elements include PIN photodiode detectors or avalanche photodiode detectors.

[0035] In an optional embodiment, the receiving field angle of the PIN photodiode detector is 12°, and the response waveband is 400-700 nm; and the receiving angle of the photodetector array covers a range of 0°-180°.

[0036] Specifically, by adjusting the normal vector direction of the receiving surface, the interference signal ratio of the channel matrix is reduced, and the tilt angle is optimized with the minimum interference signal ratio as the optimization target; the specific spatial positions of different photodetector array elements on the spherical surface are determined by the regularly changed azimuth angle and elevation angle.

[0037] Specifically, a wide-angle receiving lens suitable for visible light communication is used, and the receiving surface of the photodetector array element is designed as a curved surface structure; the photodetector array elements are uniformly arranged on the surface of the carrier to receive signal light from different directions, and the signal light includes white light, blue light and red light spectrum components, and each photodetector array element can receive three types of signal light and work in parallel.

[0038] The receiving surface of each photodetector array element is designed as a curved surface, and all the array elements are uniformly arranged on the surface of a spherical or hemispherical carrier, so that the curved receiving surfaces of the array elements cooperatively form a complete spherical receiving end. The spherical structure can cover a receiving angle range of 0°-180°, and no matter from which direction the optical signal is incident, it can be effectively received by the array element at the corresponding position, breaking through the defect that the viewing angle of the planar receiving end is limited, and full-view signal capture can be realized without adjusting the attitude of the receiver.

[0039] Each photodetector array element of the curved receiving surface, such as a PIN photodiode or an avalanche photodiode, serves as an independent signal detection unit, and its core function is to convert incident visible light signals into electrical signals. Each photodetector array element works in parallel to capture light signals from different directions and complete photoelectric conversion.

[0040] Embodiment 2 In the embodiments of the present application, a receiving method is disclosed, which relies on the advantages of the spherical array structure of the receiving end to realize non-aliasing scene low-noise reception, aliasing scene multi-channel signal recovery and dynamic boundaryless reception. The following are specific implementation steps: S1: initialization parameter configuration The spherical carrier of the wide-view angle array receiver has a diameter of 10 cm, and 60 PIN photodiode detectors are uniformly arranged on the surface of the spherical carrier in a 60-hedron structure, with a single detector field of view angle of 12° and an overall receiving angle covering 0°-180°. The signal processing unit includes a low-noise amplification subunit, an aliasing signal separation subunit and a demodulation recovery subunit; the low-noise amplification subunit has a noise coefficient less than 1.5 dB and an amplification gain adjustable between 20 dB and 40 dB; the aliasing signal separation subunit realizes real-time blind source separation based on FPGA; and the demodulation recovery subunit supports demodulation of multiple modulation formats.

[0041] S2: multi-angle signal acquisition and scene judgment 60 detectors of wide-viewing-angle array receiver synchronously collect incident light signals, obtain signal intensity data and incident angle information; signal intensity data is collected by built-in power detection module of detector; incident angle information is calculated based on array signal angle measurement algorithm.

[0042] Non-aliasing scene and aliasing scene judgment, including: Only a single detector or less than or equal to 2 adjacent detectors detect valid signals, the signal frequency component meets the Nyquist condition, there is no false frequency component, and no other detector detects the same source superimposed signal, then it is determined as a non-aliasing scene.

[0043] More than 3 detectors detect valid signals, and there is a situation that the signal angle difference is less than or equal to 5°, the distortion after intensity superposition is greater than 15%, or a plurality of groups of different frequency signal components are detected, then it is determined as an aliasing scene.

[0044] S3: Non-aliasing scene signal processing Sort the signal intensity of 60 detectors, and select the detector channel with the highest signal intensity; Send the target channel signal into the low-noise amplification subunit, set the amplification gain to 20 dB, filter out thermal noise and shot noise through the band-pass filter, and the signal-to-noise ratio of the filtered signal is improved to 35 dB; Perform demodulation recovery according to the steps of "carrier synchronization-bit synchronization-sampling judgment-decoding error correction"; carrier synchronization is captured and tracked by phase-locked loop; bit synchronization uses Gardner timing synchronization algorithm to extract symbol synchronization clock; sampling judgment completes signal level sampling judgment under the trigger of the synchronization clock; decoding and error correction are based on LDPC error correction code to perform channel coding verification and error correction, and restore the original data.

[0045] S4: Aliasing scene signal processing Collect the aliasing electric signals superimposed in the space to obtain a plurality of observation signals x i (t) m . T .

[0046] Extract the angle characteristics of 12 effective photodetector array elements, set the incident angle of the jth source signal to the ith photodetector array element as θ ij , select trigonometric function as the angle weight function w(θ ij ); construct a 4×12 signal mixing matrix A with angle weight, where 4 is the number of source signals and 12 is the number of electric detector array elements; the elements a ᵢⱼ of the signal mixing matrix A are calculated by the angle weight function w(θ ij ) and the signal attenuation coefficient β ijjointly determined, i.e., a ij =β ij •w(θ ij ).

[0047] A linear mixing model x(t) = A·s(t) is constructed based on the signal mixing matrix A and the observed signal matrix x(t). Blind separation processing is performed on the linear mixing model using the independent component analysis algorithm to obtain the independent electrical signals s(t) = [s1(t), s2(t), ... s2(t)]. n (t)] T .

[0048] This embodiment balances low noise performance in non-aliasing scenarios with anti-interference capability in aliasing scenarios; the wide-view array receiver's all-angle layout breaks through the angle limitations of traditional receiving methods; the independent component analysis algorithm combined with the angle weight design improves the accuracy and efficiency of aliasing signal separation, ultimately achieving wide-range, highly stable, and low-error optical signal reception.

[0049] Example 3 like Figure 3 As shown in the embodiments of this application, a visible light communication system is disclosed, including a transmitter module and a receiver module; The transmitting module includes a full-resource transmission unit and an LED array transmitting unit, and the full-resource transmission unit is electrically connected to the LED array transmitting unit; The full-resource transmission unit is used to modulate the original data to be transmitted to generate an optical signal that meets the transmission requirements; the LED array transmitting unit is used to receive the optical signal output by the full-resource transmission unit and transmit the optical signal outward in full-power or full-bandwidth mode. The receiving module includes a wide-viewing-angle array receiver and a signal processing unit, wherein the wide-viewing-angle array receiver is electrically connected to the signal processing unit; The wide-viewing-angle array receiver is the same as the wide-viewing-angle array receiver described in Embodiment 1, used to receive the optical signal sent by the LED array transmitting unit and convert it into an electrical signal; the signal processing unit is used to execute the receiving method described in Embodiment 2, demodulate the electrical signal output by the wide-viewing-angle array receiver, and generate a corresponding digital signal.

[0050] Specifically, the LED array emitting unit uses 8 independently controllable high-power white LEDs, with a response band matching the receiver detector (400-700nm), and supports OOK / PPM / QAM modulation. The high-speed modulator of the full-resource transmission unit has a bandwidth of 0-200MHz, the FPGA data processing module has a main frequency of 1GHz, the single-channel transmission power is adjustable from 0 to 3W, and up to 8 transmission channels can be opened at the same time without avoiding signal aliasing.

[0051] Specifically, it further comprises a channel adaptation unit, a 5m*5m*3m standard transmission scene in the room is constructed, by adjusting the number of LED emission channels, the relative position and angle of the emission end and the receiving end, the channel environment such as single-channel signal direct radiation, multi-channel signal superposition, dynamic shielding, etc. is simulated, and the transmission distance covers 0-10m.

[0052] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application claimed.

Claims

1. A wide-viewing-angle array receiver for use in a visible light communication system, characterized in that, Including photodetector arrays; The photodetector array consists of a carrier and several photodetector elements. The receiving surface of each photodetector element is curved. Each photodetector element is evenly distributed on the surface of the carrier, and the receiving surfaces work together to form a spherical receiving end, which is used to receive incident light signals at different angles and convert them into electrical signals.

2. The wide-view array receiver according to claim 1, characterized in that, The carrier includes a spherical or hemispherical support, and the surface of the support has a plurality of mounting holes for mounting the photodetector array elements.

3. The wide-view array receiver according to claim 2, characterized in that, The photodetector array elements are distributed in a polyhedral pattern on the surface of the support. The polyhedral pattern includes a truncated octahedron, a regular dodecahedron, a truncated dodecahedron, a regular icosahedron, a truncated icosahedron, or a hexahedron arrangement.

4. The wide-view array receiver according to claim 3, characterized in that, The photodetector array element includes a PIN photodiode detector or an avalanche photodiode detector.

5. The wide-view array receiver according to claim 4, characterized in that: The PIN photodiode detector has a receiving field of view of 12° and a response band of 400–700 nm; the receiving angle of the photodetector array covers the range of 0°–180°.

6. A receiving method, applied to the wide-view array receiver according to any one of claims 1-5, characterized in that, include: Using the spherical receiver of the wide-view array receiver, visible light signals at different incident angles are collected, and the visible light signals at each incident angle are converted into corresponding electrical signals. Based on the electrical signal, the intensity of the visible light signal incident on each photodetector element in the wide-view array receiver, as well as the corresponding incident angle information, are obtained to determine whether the current communication scenario is a non-aliasing scenario or an aliasing scenario. If the current communication scenario is determined to be a non-aliasing scenario, the signal channel corresponding to the photodetector array element with the highest visible light signal intensity is selected, and the electrical signal output by the channel is sequentially amplified and filtered. Then, the amplified and filtered electrical signal is demodulated to recover the original transmission data. If the current communication scenario is determined to be an aliasing scenario, the angle feature extraction and blind source separation processes are sequentially performed on the multiple superimposed electrical signals to obtain each independent electrical signal. Then, each independent electrical signal is demodulated to recover the original transmission data corresponding to each signal.

7. The receiving method according to claim 6, characterized in that, The process of sequentially performing angle feature extraction and blind source separation on the multi-channel superimposed electrical signals yields independent electrical signals for each channel, including: Multiple superimposed aliased electrical signals in space are collected to obtain several observation signals, forming an observation signal matrix; The incident angles of each independent source signal corresponding to the aliased electrical signal arriving at the photodetector array element are extracted. Trigonometric functions, Gaussian angle windows, or direction response functions are selected as angle weighting functions. Combined with the preset signal attenuation coefficient, an angle-weighted signal mixing matrix is ​​constructed. A linear mixing model is constructed based on the signal mixing matrix and the observed signal matrix. The linear mixing model is then subjected to blind separation processing using the independent component analysis algorithm to obtain each independent electrical signal. The expression for the elements of the signal mixing matrix is: a ij =β ij •w(θ ij ); Where w(θ) ij ) represents the angle weighting function, β ij Indicates the signal attenuation coefficient; The expression for the linear mixture model is: x(t) = A·s(t); s(t)=[s1(t),s2(t),…s n (t)] T ; x(t)=[x1(t),x2(t),…,x m (t)] T ; Among them, s j (t) represents an independent source signal, x i (t) represents the observed signal; A∈R m*n It is a signal mixing matrix with angle weights.

8. The receiving method according to claim 7, characterized in that, The determination of whether the current communication scenario is a non-aliased scenario or an aliased scenario includes determining it as a non-aliased scenario if the current communication process meets the Nyquist sampling condition and has no spurious frequency components; and determining it as an aliased scenario if the current communication process does not meet the Nyquist sampling condition or has spurious frequency components.

9. A visible light communication system, characterized in that, Includes a transmitter module and a receiver module; The transmitting module includes a full-resource transmission unit and an LED array transmitting unit, and the full-resource transmission unit is electrically connected to the LED array transmitting unit; The full-resource transmission unit is used to modulate the original data to be transmitted to generate an optical signal that meets the transmission requirements; the LED array transmitting unit is used to receive the optical signal output by the full-resource transmission unit and transmit the optical signal outward in full-power or full-bandwidth mode. The receiving module includes a wide-viewing-angle array receiver and a signal processing unit, wherein the wide-viewing-angle array receiver is electrically connected to the signal processing unit; The wide-viewing-angle array receiver is the wide-viewing-angle array receiver according to any one of claims 1-5, used to receive the optical signal sent by the LED array transmitting unit and convert it into an electrical signal; the signal processing unit is used to execute the receiving method according to any one of claims 6-7, demodulate the electrical signal output by the wide-viewing-angle array receiver, and generate a corresponding digital signal.

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