438 results about "Visible light communication" patented technology

A communication apparatus for performing underwater visible light communication with a target communication apparatus includes a visible light communicator that transmits and receives a visible light signal including communication data, a sound wave communicator that receives a sound wave signal including information used to control establishment of visible light communication connection, the sound wave signal having been transmitted from the target communication apparatus or another communication apparatus, and a controller that performs control to establish the visible light communication connection with the target communication apparatus, based on the information included in the received sound wave signal.

The invention relates to the technical field of intelligent maintenance of tunnel electromechanical facilities, in particular to a tunnel lamp recognition and spatial positioning method based on binocular vision, which comprises the following steps: synchronously acquiring tunnel environment images through left and right cameras subjected to polar horizontal correction, inputting the images into a lightweight tunnel lamp detection model, and detecting an area image containing a lamp bounding box; extracting feature points in the bounding box by adopting a multi-scale adaptive FAST feature extraction algorithm, describing the feature points by rotating an invariant binary descriptor, and generating a disparity map in combination with an adaptive Hamming distance matching algorithm; calculating three-dimensional space coordinates of the lamp according to the disparity map by using a binocular camera triangulation principle and combining camera parameters; when the ambient illumination is lower than a threshold value, a multispectral image fusion module is started to enhance the feature matching robustness; and when continuous matching fails, visible light communication assisted positioning is started. According to the invention, the problem of low positioning precision of the lamp in a complex tunnel environment is solved, and the reliability and efficiency of identification and positioning are improved.

The invention discloses a visible light communication data transmission method based on dynamic modulation, and particularly relates to the field of visible light technology communication. The method comprises the following steps: performing nonlinear dynamic feature extraction on an actual light intensity signal emitted by a light emitting diode to generate a spectral response feature set; performing segmented analysis on the frequency domain distortion evolution trend based on the frequency spectrum response feature set to obtain a plurality of frequency spectrum distortion subintervals; performing local modulation parameter optimization on each spectrum distortion subinterval to obtain a dynamic local modulation parameter set; mapping the dynamic local modulation parameter set into a modulation driving strategy sequence, and generating a dynamic modulation waveform signal sequence; performing detection and time-frequency feature extraction on the dynamic modulation waveform signal sequence to obtain a target signal sequence after noise suppression; and the target signal sequence is demodulated, complete data is recovered, visible light communication data transmission is completed, and the optical communication signal quality and the data recovery capability in a complex modulation environment are effectively improved.

The invention provides an indoor positioning method and system based on dynamic mode switching and data fusion, and relates to the technical field of visible light indoor positioning, and the method comprises the following steps: deploying a VLC transmitting device and an auxiliary positioning point, constructing a VLC fingerprint database, carrying out dynamic signal detection and mode conversion, carrying out VLC fingerprint positioning, carrying out IMU data processing, and carrying out main positioning mode data fusion. VLC signal intensity distance estimation, ultrasonic ranging, IMU relative displacement estimation and standby positioning mode data fusion are carried out. According to the invention, by deploying the visible light communication transmitting device and the auxiliary positioning point, the strength and the stability of the VLC signal are monitored in real time, and dynamic positioning mode switching is realized through fuzzy logic reasoning. In the main positioning mode, VLC fingerprint matching is combined with IMU data, and accurate positioning is carried out through a Kalman filtering algorithm; and when the VLC signal is weak or unstable, a standby positioning mode is switched, and accurate positioning is carried out by fusing data through a particle filter algorithm according to VLC signal intensity distance estimation, ultrasonic ranging and I MU data.

The invention provides a highway cloud toll collection system data transmission method, and relates to the technical field of data transmission. The highway cloud toll collection system data transmission method specifically comprises the following steps: S1, data acquisition; s2, data preprocessing; s3, transmitting visible light communication data; s4, road side unit data receiving and processing; s5, encrypting the data and transmitting the data to an edge computing node; s6, edge computing node data processing; s7, uploading the data to a cloud platform; and S8, carrying out deep analysis on the cloud platform data. The invention provides an expressway cloud toll collection system data transmission method which has the advantages of efficient data transmission, high safety, high reliability, intelligent data processing, high expansibility, cost effectiveness and the like. The overall performance and the user experience of the highway toll collection system can be obviously improved.

A visible-light communication and illumination array includes a substrate and plural surface-emitting superluminescent diodes, SLDs, distributed across the substrate. A first set of SLDs of the plural SLDs generates a first light beam having substantially a first wavelength, a second set of SLDs of the plural SLDs generates a second light beam having substantially a second wavelength, and a third set of SLDs of the plural SLDs generates a third light beam having substantially a third wavelength. The array further includes a controller configured to encode at least one of the first light beam, the second light beam and the third light beam to transmit information. A combination of the first light beam, the second light beam and the third light beam produces white light.

The invention discloses an intelligent seabed energy detection system and method based on visible light communication, and belongs to the technical field of deep sea detection, the detection system comprises a data acquisition system (1) and a visible light communication system (2), the data acquisition system (1) structurally comprises a high-definition camera (11), an underwater sensor (12) and a first analog-to-digital converter ADC (13), the visible light communication system (2) structurally comprises a transmitting end and a receiving end; the detection method comprises the steps of front-end acquisition, signal conversion, signal processing, optical signal transmission and signal restoration. The characteristics of high frequency and large bandwidth of light waves are utilized, the intensity of light is modulated, binary code element signals are converted into optical signals, the optical signals are received through the photoelectric detector for underwater information transmission, efficient and real-time submarine energy monitoring and analysis are achieved, and comprehensive technical support is provided for development and utilization of submarine energy.

The invention relates to an underwater visible light signal recovery method based on transfer learning, and aims to solve the problems of signal noise, distortion and communication performance reduction caused by disturbance of water turbidity, flow velocity, ambient light intensity and the like on an underwater visible light communication (UVLC) system. In combination with transfer learning and a generative adversarial network (GAN), data are acquired through a self-developed hardware platform, background data are generated through MATLAB simulation, simulation and real image features are fused by using a conditional generative adversarial network (cGAN) to generate simulation data, signal recovery capability is trained by using a U-NetGAN model, and finally the system is deployed at a receiving end. Compared with the prior art, the scheme overcomes the problems that traditional modulation is poor in adaptability under disturbance of water turbidity, flow velocity and the like and is difficult to deal with a complex underwater environment; the defects that a deep learning method depends on large-scale data and cross-scene generalization is weak are overcome. Through the combination of transfer learning and GAN, the UVLC system communication performance is significantly optimized, the delay is low, the complexity is low, and actual deployment requirements are better met.

The invention relates to the field of beacon light control, in particular to a beacon light intelligent control method and system based on visible light communication. The method comprises the following steps: acquiring a weather type, a weather type grade, ambient light brightness, visibility and a wind speed of a target area; monitoring the target area based on the ambient light brightness to obtain a target ship; constructing a beacon light power prediction model, and predicting the beacon light power by using the beacon light power prediction model according to the weather type, the weather type grade, the ambient light brightness, the visibility and the wind speed; and obtaining a visible light communication protocol, and controlling the beacon light to flicker at the beacon light power based on the visible light communication protocol and the target ship. According to the invention, the problem that the beacon light is difficult to automatically adjust according to the environmental information in the prior art is solved, the real-time performance, the reliability and the self-adaptability of the working of the beacon light in a complex environment are improved, and the safety of ship navigation is further improved.

The invention belongs to the technical field of optical communication, and relates to a flexible silicon-based photoelectric device, a receiving end and a visible light communication system. The flexible silicon-based photoelectric device comprises a back electrode layer, a hole transport layer, a P-type silicon light absorption layer, an electron transport layer and a front electrode layer. The valence band side energy difference between the electron transport layer and the P-type silicon light absorption layer is greater than the conduction band side energy difference; the conduction band side energy difference between the P-type silicon light absorption layer and the hole transport layer is greater than the valence band side energy difference; the forbidden bandwidth of the electron transport layer is greater than 3.0 eV. The front electrode layer comprises a plurality of grid electrodes which are separately arranged on the surface of the electron transport layer. According to the scheme provided by the invention, the heterojunction is formed on the surfaces of the two sides of the P-type silicon light absorption layer, so that the intensity of a built-in electric field is effectively enhanced, and the flowing speed of photo-generated electrons and photo-generated holes in the device is accelerated, thereby improving the response speed of the device; and meanwhile, the collection efficiency of electrons and holes is improved, so that the photoelectric conversion efficiency of a photoelectric device is improved.

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 present invention relates to a vehicle driving intention recognition method based on laser radar and visible light communication, comprising: scanning vehicles within a detection range by laser radar to generate point cloud data; the point cloud data includes ground point cloud data; the detection range is the current driving lane of the vehicle and the adjacent lane; according to the point cloud data, detecting vehicles within the detection range to obtain a target vehicle; tracking the target vehicle to generate target vehicle tracking data and target vehicle detection status; judging whether basic information of the target vehicle is obtained to generate a first judgment result; judging the driving intention according to the first judgment result to generate a second judgment result; generating an early warning according to the second judgment result; the present invention can judge the vehicle's lane changing intention in advance when the vehicle is about to change lanes and turns on the turn signal, and accurate information perception is conducive to scientific and accurate decision-making and safety control of intelligent vehicles, thereby improving on-the-way operation safety.

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.

The invention relates to the field of optical systems, and particularly discloses a library indoor illumination control system and method based on Internet of Things, the system comprises a plurality of visible light emission child nodes, each visible light emission child node comprises an emission base, a first light source, a first polarizing film, a first controller and a first communication module, the first light source is embedded and fixed in the emitting base, the first polaroid is located above the first light source and is rotationally connected with the emitting base, and a first driving piece used for driving the first polaroid to rotate is arranged in the emitting base; the first communication module is used for receiving first control information, the first controller is used for generating a first control instruction according to a preset mode or the first control information, and the first driving piece is used for driving the first polaroid to rotate according to the first control instruction to form flicker frequency information. According to the technical scheme, the characteristics of library scenes can be combined, and a user can conveniently use the smart phone to carry out visible light communication.

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 relates to the technical field of green communication, and discloses a visible light communication system and method based on CDMA (Code Division Multiple Access), the system comprises a transmitting end module, a visible light channel module, a receiving end module and a dynamic optimization module, by combining a CDMA multiple access technology and OFDM (Orthogonal Frequency Division Multiplexing) modulation, multi-user efficient access and spectrum resource dynamic allocation are realized, and the visible light communication efficiency is improved. User data streams are distinguished based on orthogonal spreading codes, and multi-user interference is effectively suppressed; through an OFDM subcarrier mapping and self-adaptive power allocation algorithm, the subcarrier transmitting power is optimized, the spectrum utilization rate is improved, the problem of resource allocation rigidness in a traditional TDMA / FDMA technology is solved, the communication capacity and the data transmission efficiency in a multi-user scene are remarkably improved, and by measuring the signal-to-noise ratio and the path loss of a channel in real time, the transmission efficiency of the multi-user scene is improved. And the spreading code length and the OFDM modulation order are dynamically adjusted, and signal attenuation and distortion caused by complex illumination conditions and a multipath effect are reduced.

The invention relates to a VLC-RF (Visible Light Communication-Radio Frequency) network resource matching method based on a yoke theory and reinforcement learning, and the method comprises the steps: deducing a state transition matrix of a system service process through constructing a VLC-RF heterogeneous network switching service mechanism; network QoS parameters are evaluated based on a yoke theory, and a user satisfaction utility function is constructed in combination with queue reliability QoS, time delay reliability QoS and jitter reliability QoS. And finally, acquiring a service rate combination required to be provided by a system network by adopting reinforcement learning so as to realize optimal allocation of resources and improve the network service efficiency.

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.

The invention relates to the technical field of communication, and discloses a buoy-type cross-medium communication device, system and algorithm wherein the device comprises a buoy comprising a water surface mechanism and an underwater mechanism; the system comprises a water surface control module and an underwater control module. The water surface control module comprises a TCP / IP (Transmission Control Protocol / Internet Protocol) processor and is wirelessly connected with a remote terminal through WiFi (Wireless Fidelity) communication; the underwater control module comprises a visible light communication control unit, a visual positioning unit, a tracking power unit and an environment perception and self-adaption unit; the algorithm comprises the following steps: step 1, an initialization stage; 2, a communication establishment stage; 3, a dynamic tracking stage; and 4, an energy efficiency management stage. According to the float-type cross-medium communication device, system and algorithm, seamless connection of water surface WiFi and underwater visible light communication is realized, and meanwhile, the communication stability in a complex marine environment is ensured through a visual positioning and active tracking mechanism.

The invention discloses a visible light communication method based on precoding and adaptive dynamic compression. The method comprises the following steps: data layering and precoding processing; signal conversion and clipping; regulating and controlling a dynamic peak value and generating a signal; receiving end signal recovery and processing; decoding and recovering the signal; and separating and demodulating the signal. The method comprises the following steps of: layering original data by adopting a modulation mode of mixing ACO-OFDM and PAM-DMT at a transmitting end; layered signals are preprocessed through a precoder, the peak-to-average power ratio of the signals is reduced, converted time domain signals are input into a generative adversarial network-based framework, and the framework adaptively performs amplitude compression and dynamic clipping on the signals through a feedback mechanism of a convolution feature extraction module and a discriminator, so that the peak-to-average power ratio is effectively reduced; a convolutional feature extraction module at a receiving end generates a recovered signal, and nonlinear distortion is reduced; the signal recovery precision and the spectrum efficiency of a communication system are remarkably improved, and meanwhile the reliability and stability of communication are guaranteed.

The invention belongs to the technical field of wireless optical communication, and particularly relates to a visible light communication method based on dynamic blocking bias, which specifically comprises the following steps: data acquisition and primary processing; processing and combining the signals; performing dynamic block time domain bias processing; signal receiving and primary processing; noise suppression processing; and demodulating and separating the signal. At a transmitting end, the ACO-OFDM signal, the PAM-DMT signal and the DCO-OFDM signal are mixed, so that the full utilization of subcarriers is realized, and the spectrum efficiency is remarkably improved. Meanwhile, the minimum time domain bias of each signal is calculated, a dynamic direct current bias sequence is constructed, real-time adjustment is carried out according to signal characteristics, the non-negativity of the signals is ensured, the average optical power of the system is effectively reduced, and the light energy utilization rate is improved. The spectrum efficiency and the light energy utilization rate of the visible light communication system are improved, and the method is also suitable for efficient and reliable visible light communication scenes.

The invention relates to the technical field of visible light communication (VLC), particularly discloses a multi-band CAP digital chaotic encryption method and system in a band-limited visible light communication system, and designs three encryption modes of chaotic constellation mapping, chaotic index selection and chaotic PWC coding. According to the chaotic constellation mapping, the positions of constellation points in the corresponding original constellation set are adjusted according to the constellation bits, and a new chaotic constellation set is obtained; the chaotic index selection is used for scrambling a corresponding relation between two distinguishable constellation modes and two encrypted chaotic constellation sets; and performing sub-band sequence chaotic encryption on m sub-bands obtained after block creation by chaotic PWC coding, disorganizing the sequence of the m sub-bands, and then performing PWC coding. Three encryption modes are designed, when confidential information is located in the coverage range of the VLC system, useful information in the system can be prevented from being eavesdropped by unauthorized malicious users, and therefore the information transmission safety is enhanced.

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 provides an implementation method and system of a flexible fluorescent condenser visible light communication system, and relates to the technical field of data processing, and the method comprises the steps: taking a perovskite thin film as a core light receiving element, and carrying out the processing with a light source driving module, an optical lens group, a photoelectric detector and a signal analysis instrument, so as to generate a light signal receiving device; the method comprises the following steps: setting two fixed detection points on an optical signal receiving device, establishing a reference axis according to the two detection points, performing gridding segmentation on the reference axis, and generating a communication performance adjustment value by adopting a multi-target particle swarm optimization algorithm; and according to the communication performance adjustment value, the light current output by the perovskite thin film is demodulated and analyzed when the optical signal receiving device runs, and the optical communication rate with the field angle larger than + / -30 degrees, the bandwidth of 197.9 MHz and the 432 Mbps is achieved. The photoelectric property stability and the light absorption efficiency of the thin film are improved.

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.