194 results about "Visible light communication" patented technology

The invention provides a layered water injection well injection profile testing system, electronic equipment and a storage medium, and the system comprises a plurality of visible light communication modules which are respectively installed on eccentric water distributors of all water injection layers and on water injection pipe couplings between any two water injection layers; the plurality of sensing monitoring modules are mounted on the eccentric water distributor and are used for acquiring underground monitoring data of the layered water injection well; and the upper computer terminal is used for processing the underground monitoring data based on the group strategy optimization model to obtain an optimized water injection strategy, further generating a water injection control instruction, and transmitting the water injection control instruction to the eccentric water distributors of the water injection layers through a downlink channel. According to the scheme, the LED is used for transmitting data under the dark well, the problems existing in an existing transmission mode are solved, the original water injection well layout structure is not changed through installation of the hardware module, space is saved, and more stable and reliable light transmission can be achieved.

The invention belongs to the technical field of visible light detection, and aims to realize accurate detection of multicolor visible light and monolithic integration of a multi-wavelength receiver. The invention provides a fully-integrated multicolor visible light detector based on a sub-wavelength polycrystalline silicon grating, which comprises three detectors capable of selectively detecting blue, green and red signals respectively. The principle is as follows: a one-dimensional sub-wavelength polycrystalline silicon grating in the multicolor detector is embedded in an upper SiO2 layer and a lower shallow trench isolation region to form a dielectric waveguide structure of which the middle is a high-refractive-index medium and the periphery is a low-refractive-index oxide layer. The period and the grating width of the sub-wavelength grating are changed, so that the incident polarized light and the sub-wavelength periodic structure are strongly coupled to cause a guided-mode resonance effect, and the sub-wavelength grating can be applied to a transmission optical filter. The size and the cost of the multicolor visible light communication system can be effectively reduced, and the data transmission rate of the system is greatly improved.

A visible light communication apparatus comprising: multiple sources, at least one source being a light source configured to transmit a data signal; and a receiver comprising a polarizer, operating in a visible light spectrum, the receiver configured to receive visible light energy from the one or more sources; the polarizer configured to filter multiple noise signals and allow the data signal to pass through to the receiver. Allows more signal light than background light to reach the sensor, the polarizer improves signal to noise ratio for outdoor visible light communication.

The invention provides a high-reliability lamp mutual positioning method, system and device and a medium. The method comprises the following steps: determining a mutual influence relationship between lamps through reference parameters of the lamps with a visible light communication function in a target shopping mall during installation and working state parameters of visible light signals of the lamps; determining an interference feature vector of each lamp in the positioning process according to the mutual influence relationship, the multipath effect of the visible light signal and the interference superposition feature; determining a positioning constraint condition of each lamp, and determining a cooperative positioning parameter of each lamp through all the positioning constraint conditions and all the interference feature vectors; and determining relative positioning information of each lamp in the target shopping mall according to the anti-interference configuration parameter of the visible light signal of each lamp in the positioning process and all the cooperative positioning parameters. By adopting the scheme of the invention, the influence of the multipath effect and signal attenuation between the lamps on mutual positioning of the lamps can be reduced, so that high-reliability mutual positioning of the lamps is realized.

The utility model relates to the technical field of visible light communication, and discloses a visible light communication emission head, which comprises a reflection cup, the reflection cup comprises an inner cavity with a gradually increased opening, and the surface of the inner cavity is provided with a reflection layer; the light source is arranged at one end, with a narrower opening, of the inner cavity; the first convex lens is arranged at one end of the reflection cup and covers the light source; the second convex lens is arranged at the other end of the reflection cup; light emitted by the light source sequentially penetrates through the first convex lens, the inner cavity and the second convex lens and then irradiates outwards. The utility model aims to provide the visible light communication transmitting head which is compact in structure, low in cost, long in transmission distance and suitable for long-time operation.

A visible light communication apparatus comprising: sources configured to transmit a data signal; and a receiver comprising: measurement areas configured to sense and quantize energy from the sources, and attenuators configured to attenuate energy from the sources, by a step attenuation, based at least in part on a value of the sensed and quantized energy; the receiver being configured to determine whether the sensed and quantized energy saturated the measurement areas.

The invention relates to the technical field of visible light communication, and discloses an intelligent lamp data transmission system based on visible light communication. The system comprises an optical signal processing module, a transmission management module and a terminal control module. The optical signal processing module collects and processes the visible light signal and outputs a light intensity space coding signal; after the transmission management module receives the signal, the signal is decoded by the signal analysis unit to obtain an original data stream signal and a channel interference characteristic signal, the channel optimization unit processes the original data stream signal and the channel interference characteristic signal to obtain an optimal modulation parameter signal, and the transmission strategy unit outputs a dynamic bandwidth allocation signal; in the terminal control module, an adaptive modulation execution unit adjusts the driving parameters of the light emitter according to the optimal modulation parameter signal, a lamp array control unit adjusts the working state of a lamp light-emitting unit and collects a real-time link state signal, and a link monitoring module outputs a communication quality index. The system is suitable for an intelligent illumination and data transmission fusion scene.

The invention discloses a visible light communication anti-eavesdropping method based on deep reinforcement learning and an optical intelligent reflecting surface, and relates to visible light communication security. Constructing a multi-user safe visible light communication indoor model, and designing a reverse pre-reflection model based on geometrical optical modeling to drive a deep reinforcement learning agent to learn; and accumulating experience by interacting with the environment, sampling and updating the weight of the deep reinforcement learning network by a sampling experience playback pool, and guiding intelligent control on LED beam forming and an optical intelligent reflecting surface. The guide error of the optical intelligent reflecting surface in the environment is perceived by the model at each moment, the secrecy rate of a receiving user is received, the deep reinforcement learning network is combined with the strategy at the previous moment and the environment state to output the strategy at the next moment, and the experience playback pool is circularly updated. And deep reinforcement learning is driven by a reverse pre-reflection model to jointly optimize LED beam forming and optical intelligent reflecting surface guiding, and the optical intelligent reflecting surface is used for accurately controlling a reflection path in a complex dynamic environment, so that the safety communication capability and the resource allocation efficiency are improved.

The present invention relates to a lighting address configuration system using visible light communication, which may allow direct configuration of a desired address under a lighting for which an address is desired to be configured after installing the lighting by using visible light generated by blinking of the corresponding lighting, improve a recognition rate of a visible light signal according to blinking of the light, and improve quality by greatly reducing a possibility of duplication when issuing random numbers for address configuration.

The invention belongs to the technical field of visible light communication, and relates to a mobile visible light communication method and system. The distance between the receiving end and the transmitting end and the movement speed of the receiving end are calculated and fed back to the transmitting end, so that the transmitting end modulates a to-be-transmitted signal; filtering the initial image time sequence to obtain a target image time sequence, and when the movement speed is greater than a preset movement speed threshold, performing guided filtering on the target image time sequence to obtain an updated target image time sequence; for each frame of image in the target image time sequence, normalizing the pixel value of each pixel point by taking the row pixel where each pixel point is located as a unit so as to calculate the standard deviation of the gray value gradient of each row of pixels; calculating a pixel value threshold value based on the row pixel with the maximum standard deviation of the gray value gradient in each frame of image; and removing pixel points of which the pixel values are lower than the pixel value threshold value in each frame of image to obtain a target frame of image, and demodulating the target frame of image to obtain the optical signal transmitted by the transmitting end.

Visible light communication (VLC) enabled unmanned aerial vehicles (UAVs) have evolved as a promising technology for the fifth generation and beyond communications. The proposed invention describes a system and methodology for deploying VLC-enabled UAVs, which serve as flying base stations (V-FBSs) over the target area: disaster regions, concert and fest areas, and search and rescue operations zones. The V-FBSs provide both communication and illumination. The proposed system follows CRAN architecture, which helps reduce the CAPEX and OPEX significantly. Further, present disclosure delivers a complete method to deploy the V-FBS network along with the detailed synchronization process required for autonomous deployment. It offers a complete 3-D deployment of the V-FBSs, which ensures minimum interference while satisfying the promised QoS and providing an energy-efficient position. The proposed network is scalable and can significantly reduce the outage. Since VLC is used for the present invention, the network does not interfere with the neighboring RF networks.

The application provides a channel estimation method of a visible light communication system, and relates to the technical field of channel estimation. The method comprises the following steps: obtaining a pilot observation matrix of a receiving end; calculating an initial channel estimation by using an LMMSE estimator; splicing the initial channel estimation and a noisy state of a diffusion time step to obtain a joint input tensor; inputting the joint input tensor into a pre-trained LMRDNet, recovering a predicted residual matrix from the noisy state through a reverse diffusion process; and calculating refined channel state information according to the initial channel estimation and the predicted residual matrix. Through the fusion of an LMMSE statistical priori and a customized lightweight diffusion model, the application realizes high-precision channel estimation under the condition of limited pilots and low signal-to-noise ratio.

This utility model discloses a visible light communication transmitting device, relating to the field of visible light communication technology. The visible light communication transmitting device includes a format conversion circuit, a bandwidth expansion circuit, a level bias circuit, and a modulation and LED array circuit connected in sequence. The input terminal of the format conversion circuit receives a high-speed differential electrical signal, and the output terminal outputs a serial electrical signal. The input terminal of the bandwidth expansion circuit receives the serial electrical signal, and the output terminal outputs an inverted high-speed signal. The input terminal of the level bias circuit receives the inverted high-speed signal, and the output terminal outputs a forward high-speed signal. The input terminal of the modulation and LED array circuit receives the forward high-speed signal, and the output terminal outputs visible light. This utility model can reduce the hardware cost of the device while ensuring a large bandwidth for the visible light communication device.

The present application relates to the technical field of visible light communication, in particular to a FTN-mCAP interference mitigation method and system based on gap index modulation, comprising: using FTN-mCAP-GIM mapping at the transmitting end, using a gap index mechanism to activate k subbands in m subbands; the gap activation mechanism is that adjacent subbands cannot be activated at the same time; the m subband signals are up-sampled, the real part and the imaginary part of each subband signal after up-sampling are subtracted after passing through FTN in-phase filters and FTN quadrature filters respectively, and the target signal of each subband is obtained; the target signals of all subbands are combined to generate a transmitting signal. The present application can effectively avoid excessive overlap of different subbands in the frequency spectrum, reduce the inter-band interference generated at the transmitting end, achieve better bit error rate performance, and save bandwidth resources.

This invention discloses an FPGA-based visible light Ethernet rate-adjustable communication method and system, relating to the field of visible light communication equipment technology. It includes: an off-chip PHY chip, a MAC core, and an FPGA rate conversion and flow control module connected sequentially. The FPGA rate conversion and flow control module is connected to both an FPGA transmit control module and an FPGA receive control module. The FPGA transmit control module and the FPGA receive control module are connected to transceiver circuits, which are then connected to an LED and a photodiode, respectively. This invention addresses the need for visible light-Ethernet communication interface conversion, deeply integrating visible light communication with Ethernet access technology, while simultaneously solving the problem of the traditional single rate of visible light Ethernet, thus broadening the application scenarios of visible light communication.

This invention relates to the field of visible light communication technology and discloses a smart lighting data transmission system based on visible light communication. The system includes an optical signal processing module, a transmission management module, and a terminal control module. The optical signal processing module acquires and processes visible light signals, outputting a spatially encoded light intensity signal. The transmission management module receives this signal, decodes it through a signal analysis unit to obtain the original data stream signal and channel interference characteristic signal, processes it through a channel optimization unit to obtain the optimal modulation parameter signal, and outputs a dynamic bandwidth allocation signal through a transmission strategy unit. In the terminal control module, an adaptive modulation execution unit adjusts the light transmitter drive parameters according to the optimal modulation parameter signal, a lighting array control unit adjusts the working state of the lighting units and collects real-time link status signals, and a link monitoring module outputs a communication quality index. This system is suitable for scenarios integrating smart lighting and data transmission.

This terminal device comprises a plurality of visible-light communication units including a visible-light communication unit and a visible-light communication unit, and a control unit for controlling the plurality of visible-light communication units. Each of the plurality of visible-light communication units has directivity in respectively different directions. The control unit exercises simultaneous communication control so that a visible-light communication unit performs visible-light communication with a base station device while a visible-light communication unit performs visible-light communication with a base station device.

A semiconductor device comprising: a silicon substrate; at least one P+ / N-well structure formed on the substrate, the at least one P+ / N-well structure comprising a first set of N-well layers coupled to an extra positive extrinsic electric field, and a second set of N-well layers coupled to an extra negative extrinsic electric field; and whereby the extra positive extrinsic electric field and the extra negative extrinsic electric field accelerate movement of carriers in the layers.

A terminal apparatus includes multiple visible light communicators including a visible light communicator and a visible light communicator, and a controller configured to control the multiple visible light communicators. The multiple visible light communicators each have a directivity in a different direction. The controller is configured to perform simultaneous communication control of the visible light communicators, the visible light communicator performing visible light communication with a base station apparatus and the visible light communicator performing visible light communication with a base station apparatus.

The invention provides a visible light communication sending method, a receiving method and a visible light communication device, and the sending method comprises the steps: obtaining input information, and carrying out the filling processing of redundant bits when the information bit length of the input information is smaller than a preset required length; when the information bit length of the input information exceeds a preset required length, grouping the input information; grouping the generation matrix of the input information, and respectively storing the first row of data of each group in different addresses of a grouping register; the first row of data is shifted once in each clock cycle, information bits and check bits are generated, and LDPC codes are obtained; modulating the LDPC code to obtain a first modulation signal; performing digital-to-analog conversion on the first modulation signal to obtain a first analog voltage signal; sending the first analog voltage signal to an LED linear driving circuit to obtain a visible light signal; and sending the visible light signal to an optical signal receiving end. The transmission speed of visible light communication is improved, and the visible light communication process is more reliable.

The invention discloses a multi-unmanned aerial vehicle assisted visible light network communication method, which is applied to a multi-unmanned aerial vehicle assisted visible light communication network, and the VLC network comprises a central management unit and a plurality of unmanned aerial vehicle (UAV) communication systems in one-to-one correspondence with ground areas. The method comprises the following steps: a UAV communication system obtains communication information of a ground terminal in a corresponding ground area; the central management unit optimizes the transmitting power allocated to each ground terminal according to the communication information by taking maximization of the total network capacity of the VLC network as a target to obtain the optimal transmitting power of each ground terminal; the UAV communication system superposes the optical signal of each ground terminal based on the optimal transmitting power to obtain a total optical signal; and transmitting the total optical signal to a ground terminal, so that the ground terminal demodulates and decodes the total optical signal to obtain the information to be transmitted. The method is better in adaptability and higher in network capacity.

The invention discloses a fast switching ferroelectric domain switch for visible light communication and an array thereof, and belongs to the technical field of electro-optical switches. The switch is a 2 * 2 MZI switch unit and is composed of a silicon-based substrate, a lower cladding, a flat plate layer, a waveguide core layer and an upper cladding in sequence. The waveguide core layer is composed of two input straight waveguides, an input 2 * 2 MMI, two input S bent waveguides, two modulation straight waveguides, two output S bent waveguides, an output 2 * 2 MMI and two output straight waveguides. The outer sides and the inner sides of the two modulation straight waveguides are respectively provided with two grounding metal electrodes and one signal metal electrode. The switch array is composed of six 2 * 2 MZI switch units and two crossed waveguide units, and each crossed waveguide unit is of a central symmetry structure and is composed of a first transmission waveguide and a second transmission waveguide which are perpendicular to each other; the structure disclosed by the invention has the advantages of high integration level, low crosstalk, low insertion loss and the like, and is suitable for a large-scale photon integrated circuit.

This application discloses a wavelength division multiplexing (WDM) system, device, WDM communication method, and medium, belonging to the field of wireless communication technology. A multi-wavelength laser is used to generate input light of different wavelengths; a WDM multiplexer is used to combine and modulate the input light to obtain channels with different wavelength intervals; a demultiplexer is used to demultiplex the narrow wavelength interval channels of the WDM multiplexer to increase the number of channels in the system. This application provides a blue-green WDM optical communication system and implementation method based on a demultiplexer, using blue-green light WDM technology to improve system capacity and achieve a high-bandwidth and moderate-attenuation wireless optical communication system. WDM visible light communication is achieved through a multiplexer / demultiplexer with fine wavelength intervals for visible light.

This invention discloses a visible light communication channel modeling method for underground coal mine environments, solving the problem that existing technologies fail to accurately quantify the impact of coal mine dust and obstacles on the attenuation of received optical power. The method includes: determining the link parameters of the visible light communication system, simulation parameters of the environment, and simulation parameters of the transmitter and receiver; calculating the attenuation coefficient of received optical power due to coal mine dust and obstacles; calculating the channel impulse response and characteristic parameters; determining the noise simulation parameters of the photodetector; and calculating the bit error rate of the communication system. This invention quantifies the impact of coal mine dust and obstacles on the channel, integrating the attenuation coefficient of received optical power due to coal mine dust and obstacles into the channel model, resulting in a visible light communication channel model that better reflects the underground coal mine environment. This invention enriches the modeling methods for visible light communication channels, and the modeling results provide guidance for the design and deployment of visible light communication systems in underground coal mine environments.

This invention provides a visible light communication device, communication system, and communication method that can improve the throughput of deep learning (DL) using VLC while applying a wireless communication network to relay between VLC APs. [Solution] The visible light communication device performs visible light communication using visible light communication signals. The visible light communication device comprises a wireless signal receiving unit that receives wireless communication signals from multiple upstream communication devices via a wireless communication network using radio waves, and a terminal-side visible light transmitting unit that transmits visible light communication signals to a terminal. The wireless signal receiving unit connects to a specific upstream communication device and receives wireless communication signals depending on the communication status with the multiple upstream communication devices.

The invention provides a visible light communication, position awareness and energy collection integrated method based on OFDM, and relates to the technical field of visible light communication. The method comprises the following steps: at a sending end, performing OFDM modulation on user information to be sent to generate an OFDM signal, and sending the OFDM signal to a receiving end through a plurality of LEDs; at a receiving end, adopting a silicon photocell as a photoelectric detector to receive the OFDM signals sent by the plurality of LEDs to obtain received signals; at a receiving end, separating a direct-current component and an alternating-current component in a received signal by adopting an alternating-current and direct-current separation circuit, and performing energy collection on the separated direct-current component; at a receiving end, processing the separated AC component, extracting a positioning subcarrier and a communication subcarrier, performing OFDM demodulation on the communication subcarrier, recovering user information, and determining the position information of the user according to the light intensity information contained in the positioning subcarrier and the position information of the LED; in this way, communication, location awareness and energy harvesting functions can be provided for users at the same time.

This invention belongs to the field of visible light communication technology and relates to a nonlinear blind equalization method for a VLC system based on a variational autoencoder. The method includes: inputting the received signal into a trained blind equalization network model to obtain an equalized signal; the training process of the blind equalization network model includes: preprocessing the transmitted and received signals of the VLC to obtain a preprocessed transmitted signal Tx and its counterpart to the received signal Rx; and inputting Rx into an equalizer network to obtain the latent variable signal Tx. * The prior probability distribution and the posterior probability distribution of a given received signal Rx are obtained; the prior probability distribution and the posterior probability distribution are input into the channel estimation network to obtain the likelihood probability distribution and the equalization signal; the loss function value is calculated based on the prior probability distribution, the posterior probability distribution and the likelihood probability distribution, and the parameters of the model are updated based on the loss function value until the stopping condition is reached; the present invention integrates multiple loss functions to avoid the local optimum problem caused by a single loss function.

The invention discloses an information transmission method and device based on label bit delay distribution, which are applied to a sending end, and comprises the following steps: carrying out coding interleaving on an original information bit sequence to generate an interleaved bit sequence, and carrying out rearrangement based on a variable node degree of a protograph to obtain a rearranged bit sequence; constructing a label bit set based on a constellation diagram order, performing reliability sorting according to mutual information of each label bit in the set, dividing the label bit set into a plurality of label bit subsets, and allocating delay time slots; mapping the rearranged bit sequence to tag bits corresponding to the tag bit subsets in a blocking manner, converting the rearranged bit sequence into modulation symbols, modulating the modulation symbols and then performing transmission pretreatment to generate transmission signals, and transmitting the transmission signals to a receiving end through a visible light communication channel; and decoding the transmission signal through a receiving end, generating a decoding bit sequence, and outputting the decoding bit sequence. Therefore, through division of tag bit subsets and bit sequence rearrangement, delay time slot distribution accuracy is guaranteed, and visible light communication transmission reliability is effectively improved.

The application relates to an omnidirectional visible light communication device, which comprises a reflector (1) and a reflecting bowl (2), the reflector (1) is located above the reflecting bowl (2) and the two have a common central axis; the reflector (1) is of a solid structure, the upper surface is a circular plane, the lower surface is a convex parabolic curved surface, the lower surface is mirror-polished and is coated with a reflecting film with a reflectivity greater than 90%; the reflecting bowl (2) is designed in a parabolic curved surface and is provided with a hole in the bottom center, the shape of the hole is circular; the reflecting bowl (2) is provided with a focusing lens group (3) at the position of the hole in the bottom center, a detector circuit board (4) is arranged below the focusing lens group (3), the detector circuit board (4) is provided with photosensitive detectors for converting optical signals into electrical signals, and the detector circuit board (4) is connected with a transceiving and processing circuit board (5) through wires. The application is not limited by the existing directivity problem any more, and direct communication is realized without aiming.

The invention discloses a cascade and cross-coupling bandwidth trans-impedance amplifier for visible light communication, which adopts a fully differential topological structure and consists of a cascade enhanced input stage, an active current source load and a cross-coupling bandwidth compensation network, an enhanced feedback loop is constructed in a multi-stage cascade mode; a multi-stage common-source amplifier is connected in series in a feedback path of an input end; replacing a traditional resistive load with a current source: replacing a common-gate load resistor with the current source; the differential output end of the circuit is connected with a pair of cross coupling transistors, and the grid electrodes and the drain electrodes of the transistors are connected in a cross mode to form a positive feedback mechanism. The invention provides a novel RGC-TIA structure adopting optimized bias and cascade feedback, and by breaking through voltage margin limitation, high gain, wide bandwidth and good linearity and common-mode rejection performance are realized at the same time.