Multi-LED visible light communication receiving device and dimming control method

Abstract

The invention relates to the technical field of communication receiving, in particular to a multi-LED visible light communication receiving device and a dimming control method. The multi-LED visible light communication receiving device comprises a high-sensitivity photoelectric conversion module, a multiplexing module, a signal processing module, a decoding module, an anti-interference module and a synchronization module; by integrating an optical filter, an intelligent reflecting surface and a self-adaptive clock synchronization unit, the signal-to-noise ratio is remarkably improved, ambient light interference and inter-symbol interference are reduced, generalized dimming control and an asymmetric power distribution algorithm are adopted, collaborative optimization of brightness and communication performance is achieved, energy efficiency is improved, independent control of multiple paths of LEDs is supported, and different scene requirements are met; and the flexible receiving device supports curved surface installation, integrates a self-inspection and fault prediction module, triggers a maintenance instruction in advance, improves the stability of the system and prolongs the service life of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of communication reception, and particularly to a multi-LED visible light communication receiving device and a dimming control method. Background Art

[0002] A multi-LED visible light communication receiving device is a device for receiving visible light signals emitted by multiple LED light sources and converting them into electrical signals, supporting high-speed data transmission and optimizing communication stability. The device realizes multi-source collaborative communication through multi-channel photoelectric detection, signal separation, and anti-interference technology.

[0003] Currently, the superposition of the optical fields of multiple LED light sources causes signal aliasing at the receiving end, an increase in the bit error rate, and sudden changes in ambient light. For example, switching lights on and off and flashlights cause instantaneous distortion of the received signal, and the high dimming accuracy requirement leads to an increase in the power consumption of the LED driving circuit and a decrease in energy efficiency. A multi-LED visible light communication receiving device and a dimming control method can be designed. Summary of the Invention

[0004] To address the problems that the superposition of the optical fields of multiple LED light sources causes signal aliasing at the receiving end, an increase in the bit error rate, sudden changes in ambient light, for example, switching lights on and off and flashlights cause instantaneous distortion of the received signal, and the high dimming accuracy requirement leads to an increase in the power consumption of the LED driving circuit.

[0005] The technical solution of the present invention is: A multi-LED visible light communication receiving device and a dimming control method, including a high-sensitivity photoelectric conversion module, a multiplexing module, a signal processing module, a decoding module, an anti-interference module, and a synchronization module; a high-sensitivity photoelectric conversion module for supporting the reception of visible light dual-band signals and realizing low-noise signal recovery, a multiplexing module for avoiding crosstalk of multi-source signals, a signal processing module and a decoding module for enhancing signal anti-interference and eliminating signal distortion, and an anti-interference module and a synchronization module for suppressing ambient light interference and realizing high-precision synchronization.

[0006] Preferably, the high-sensitivity photoelectric conversion module is set with a two-dimensional perovskite flexible detector array, corresponding to responding to two bands, with wavelengths covering 400 - 500 nm and 600 - 700 nm respectively. The wavelength of 400 - 500 nm is blue light, and the wavelength of 600 - 700 nm is red light. The wavelength corresponding setting has an optical filter for filtering out ambient light interference in non-target bands and enhancing the signal-to-noise ratio to above 30 dB.

[0007] Preferably, the multiplexing module selects integrated time-division and frequency-division multiplexing technology, independently gates different LED light source channels through a CD4067 analog switch, and the multiplexing module is externally connected to an FPGA controller that works in cooperation to realize a hybrid transmission mode of time-division multiplexing TDM and space-division multiplexing SDM and improve the communication rate.

[0008] Preferably, the anti-interference module includes a space-division multiplexing optical antenna array that separates optical signals with different incident angles through a microlens array to reduce crosstalk, and enhances the signal-to-noise ratio through an adaptive ambient light suppression circuit under strong light interference.

[0009] Preferably, a flexible polyimide substrate is integrated under the two-dimensional perovskite flexible detector, and a self-check and fault prediction module for monitoring the performance of the detector is also integrated on the flexible polyimide substrate.

[0010] The present invention also provides a dimming control method for a multi-LED visible light communication receiving device.

[0011] Preferably, based on a generalized dimming control strategy, the brightness and communication performance are synergistically optimized by independently adjusting the current or pulse width PWM of each LED light source, and the reflective dimming technology is combined to maintain the uniformity of the light environment.

[0012] Preferably, for multi-color LED light sources, the CSK modulation technology is adopted to map communication data into constellation diagrams of different color combinations, support parallel data transmission, and improve energy efficiency through a dynamic power allocation algorithm, with a dimming accuracy of ±0.1%.

[0013] Preferably, a multi-link cooperative control module is integrated. Based on the multi-link protocol without an access point (MLD), the communication resources and dimming parameters of each LED link are dynamically allocated to achieve cross-link load balancing and interference coordination, and the system throughput is increased by 50%.

[0014] Preferably, the self-check module periodically detects the detector response curve, combines machine learning algorithms to predict the aging trend of the detector, triggers maintenance instructions in advance, and extends the service life of the system.

[0015] The beneficial effects of the present invention: By integrating an optical filter, an intelligent reflection surface, and an adaptive clock synchronization unit, the signal-to-noise ratio is significantly improved, ambient light interference and inter-symbol interference are reduced. By adopting a generalized dimming control and an asymmetric power allocation algorithm, the brightness and communication performance are synergistically optimized, the energy efficiency is improved, multi-channel LED independent control is supported, different scenario requirements are met, the coverage blind area is reduced, and the flexible receiving device supports curved surface installation. By integrating a self-check and fault prediction module, maintenance instructions are triggered in advance, and the system stability and service life are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a working flow chart of a multi-LED visible light communication receiving device and a dimming control method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] Please refer to Figure 1 , the present invention provides an embodiment: a multi-LED visible light communication receiving device and a dimming control method, including a high-sensitivity photoelectric conversion module, a multiplexing module, a signal processing module, a decoding module, an anti-interference module and a synchronization module; a high-sensitivity photoelectric conversion module for supporting the reception of visible light dual-band signals and realizing low-noise signal recovery, a multiplexing module for avoiding multi-light source signal crosstalk, a signal processing module and a decoding module for enhancing signal anti-interference and eliminating signal distortion, and an anti-interference module and a synchronization module for suppressing ambient light interference and realizing high-precision synchronization.

[0019] The high-sensitivity photoelectric conversion module is arranged with a two-dimensional perovskite flexible detector array, corresponding to responding to two bands, with wavelengths covering 400-500nm and 600-700nm respectively. The wavelength of 400-500nm is blue light, and the wavelength of 600-700nm is red light. The wavelength corresponding setting has an optical filter for filtering out ambient light interference in non-target bands and enhancing the signal-to-noise ratio to above 30dB.

[0020] The multiplexing module selects integrated time-division and frequency-division multiplexing technologies, independently selects different LED light source channels through a CD4067 analog switch, and an FPGA controller for realizing the hybrid transmission mode of time-division multiplexing TDM and space-division multiplexing SDM and enhancing the communication rate is externally connected to the multiplexing module.

[0021] The anti-interference module includes a space-division multiplexing optical antenna array for separating optical signals with different incident angles through a microlens array to reduce crosstalk, and enhancing the signal-to-noise ratio through an adaptive ambient light suppression circuit under strong light interference.

[0022] A flexible polyimide substrate is integrated under the two-dimensional perovskite flexible detector, and a self-check and fault prediction module for monitoring the performance of the detector is also integrated on the flexible polyimide substrate.

[0023] The present invention also provides a dimming control method for a multi-LED visible light communication receiving device,

[0024] Based on a generalized dimming control strategy, by independently adjusting the current or pulse width PWM of each LED light source, the collaborative optimization of brightness and communication performance is realized, and combined with reflective dimming technology, the uniformity of the light environment is maintained.

[0025] For multi-color LED light sources, the CSK modulation technology is adopted to map communication data into a constellation diagram of different color combinations, support parallel data transmission, and enhance the energy efficiency through a dynamic power allocation algorithm, with a dimming accuracy of ±0.1%.

[0026] Integrated multi-link cooperative control module, based on the Multi-Link Downlink (MLD) protocol, dynamically allocates communication resources and dimming parameters for each LED link, achieving cross-link load balancing and interference coordination, and increasing the system throughput by 50%.

[0027] The self-check module periodically detects the detector response curve, combines machine learning algorithms to predict the aging trend of the detector, triggers maintenance instructions in advance, and extends the system service life.

[0028] During operation, the receiving device captures visible light signals (400 - 500nm blue light, 600 - 700nm red light) emitted by multiple LED light sources through a high-sensitivity optoelectronic conversion module (two-dimensional perovskite flexible detector array), and uses a wavelength-selective optical filter to filter out ambient light interference in non-target bands, increasing the signal-to-noise ratio to over 30dB. The flexible polyimide substrate supports curved surface fitting installation, reducing the coverage blind area by 50%;

[0029] The multiplexing module uses a CD4067 analog switch and an FPGA controller to work together, dynamically selects different LED light source channels according to the signal strength, separates multi-light source signals through a hybrid transmission mode of time-division multiplexing (TDM) and space-division multiplexing (SDM), and avoids crosstalk problems caused by optical field aliasing. The space-division multiplexing optical antenna array separates optical signals with different incident angles through a microlens array, further reducing crosstalk;

[0030] The signal processing module is based on color shift keying (CSK) modulation technology, eliminates inter-symbol interference through dynamic constellation adjustment and sliding average filtering algorithms, and demodulates electrical signals in combination with a maximum likelihood detector. The anti-interference module integrates an intelligent reflecting surface (RIS), dynamically adjusts the reflection phase to compensate for the field of view angle deviation, suppresses the multipath effect, and reduces the synchronization error to ≤1ns through an adaptive clock synchronization unit (FPGA control);

[0031] The dimming control method adopts a generalized dimming strategy, dynamically adjusts the drive current or PWM duty cycle of the LED light source through reflective dimming technology, combines an asymmetric power distribution algorithm to preferentially increase the power ratio of LEDs with high communication requirements, and achieves a brightness error ≤0.1% and a bandwidth utilization rate ≥95%. The multi-link cooperative control module, based on the Multi-Link Downlink (MLD) protocol, dynamically allocates communication resources and dimming parameters for each link, increasing the system throughput by 50%;

[0032] The self-check module periodically detects the detector response curve, combines machine learning algorithms to predict the aging trend of the detector, triggers maintenance instructions in advance, and extends the system life to 50,000 hours.

[0033] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. A multi-LED visible light communication receiving device, comprising a high-sensitivity photoelectric conversion module; characterized in that: It also includes a multiplexing module, a signal processing module, a decoding module, an anti-interference module and a synchronization module; a high-sensitivity photoelectric conversion module for supporting visible light dual-band signal reception and achieving low-noise signal recovery, a multiplexing module for avoiding multi-light source signal crosstalk, a signal processing module and a decoding module for improving signal anti-interference and eliminating signal distortion, and an anti-interference module and a synchronization module for suppressing ambient light interference and achieving high-precision synchronization.

2. A multi-LED visible light communication receiving device according to claim 1, characterized in that: The high-sensitivity photoelectric conversion module adopts a two-dimensional perovskite flexible detector array, which responds to two bands, covering wavelengths of 400-500nm and 600-700nm respectively. The wavelength of 400-500nm is blue light, and the wavelength of 600-700nm is red light. The wavelength correspondence is set with an optical filter that can filter out ambient light interference in non-target bands and improve the signal-to-noise ratio to more than 30dB.

3. A multi-LED visible light communication receiving device according to claim 1, characterized in that: The multiplexing module uses integrated time division and frequency division multiplexing technology, and independently selects different LED light source channels through the CD4067 analog switch. The multiplexing module is connected to an external FPGA controller that works together to realize the mixed transmission mode of time division multiplexing TDM and space division multiplexing SDM and improve the communication rate.

4. A multi-LED visible light communication receiving device according to claim 1, characterized in that: The anti-interference module includes a space-division multiplexing optical antenna array for reducing crosstalk by separating optical signals of different incident angles through a microlens array, and improving the signal-to-noise ratio through an adaptive ambient light suppression circuit under strong light interference.

5. A multi-LED visible light communication receiving device according to claim 2, characterized in that: A flexible polyimide substrate is integrated underneath the two-dimensional perovskite flexible detector, and a self-test and fault prediction module for monitoring the performance of the detector is also integrated on the flexible polyimide substrate.

6. A dimming control method for a multi-LED visible light communication receiving device, comprising a multi-LED visible light communication receiving device according to any one of claims 1-5, characterized in that: Based on the generalized dimming control strategy, the brightness and communication performance are optimized by independently adjusting the current or pulse width PWM of each LED light source, and the reflective dimming technology is combined to maintain the uniformity of the light environment.

7. A dimming control method for a multi-LED visible light communication receiving device according to claim 6, characterized in that: For multi-color LED light sources, CSK modulation technology is used to map communication data into constellation diagrams of different color combinations, support parallel data transmission, and improve energy efficiency through dynamic power allocation algorithm, with a dimming accuracy of ±0.1%.

8. A dimming control method for a multi-LED visible light communication receiving device according to claim 6, characterized in that: The integrated multi-link collaborative control module dynamically allocates communication resources and dimming parameters of each LED link based on the non-access point multi-link protocol (MLD), realizes cross-link load balancing and interference coordination, and improves system throughput by 50%.

9. A dimming control method for a multi-LED visible light communication receiving device according to claim 6, characterized in that: The self-test module periodically detects the detector response curve and uses machine learning algorithms to predict the detector aging trend, triggering maintenance instructions in advance to extend the system service life.

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