43 results about "Visible light communication" patented technology

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.

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.

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.

This invention provides a terminal, communication system, and communication method that can reliably and easily establish a UL (Underground Communication) while applying VLC to DL (Download Communication). [Solution] The terminal comprises a visible light receiving unit that receives visible light communication signals using visible light, and a wireless transmitting unit that transmits wireless communication signals in accordance with the specifications of the mobile communication network. The visible light receiving unit receives visible light communication signals in the downlink direction transmitted from a visible light communication access point, and the wireless transmitting unit transmits wireless communication signals in the uplink direction to the mobile communication network.

The present invention provides a visible light communication device, communication system, and communication method that can ensure reliable terminal handover when VLC is applied to DL. [Solution] The visible light communication device performs visible light communication using visible light communication signals. The visible light communication device comprises an upstream visible light receiving unit that receives visible light communication signals from an upstream communication device, and a terminal-side visible light transmitting unit that transmits visible light communication signals to a terminal. The terminal-side visible light transmitting unit transmits a visible light communication signal to which identification information identifying the access point of the visible light communication formed by the visible light communication device is multiplexed.

Photovoltaic signal detector for visible light communication between vehicles and infrastructure, with its own power supply, is intended for the creation of so-called smart transport infrastructure. The device is independent of the power supply of the existing infrastructure, thanks to the photovoltaic panel (3). In this case, the photovoltaic panel (3) also serves as a photodetector for receiving a light signal (8) and, thanks to its surface, enables light communication, even if it is partially contaminated, for example, with snow or dust.

This application discloses a GaN-based micro-LED epitaxial structure, device, and fabrication method. The GaN-based micro-LED epitaxial structure includes, along the growth direction, a substrate, a buffer layer, an N-type doped GaN electron injection layer, an active region, and an Al2O3 layer. y Ga 1‑y The substrate consists of an N-type electron blocking layer and a P-type doped GaN hole injection layer; the substrate is selected from a (111) crystal plane single-crystal silicon substrate, a c-axis single-crystal sapphire substrate, a c-axis single-crystal silicon carbide substrate, or a c-axis self-supporting single-crystal gallium nitride substrate; the active region includes an InGaN-based light-emitting structure, which is at least one of an InGaN / GaN alternating multi-quantum-well structure, a GaN / InGaN / GaN single-quantum-well structure, and an InGaN quantum dot structure. This application shortens the carrier radiative recombination lifetime, weakens the quantum-confined Stark effect, and improves the radiative recombination rate by employing a thin quantum well or quantum dot active region structure, thereby enhancing the device's modulation bandwidth and photoelectric efficiency, meeting the performance requirements of light sources for applications such as data center optical interconnects, co-packaged optics, and high-speed visible light communication.

The application discloses a light source layout optimization method for an indoor visible light communication system, and comprises the following steps: determining the area of a sub-region and an optimization sequence according to the distance from the geometric center of the sub-region to the geometric center of a global region, and performing sub-region division; mapping the influence of a light source in a post-optimization sub-region as the influence of a light source at the central position of the global region on each sub-region according to the sub-region division sequence, and using different compensation factors to simulate the influence on different sub-regions; and performing single light source position optimization on the sub-regions with the distance parameter distribution uniformity as the target, so as to further improve the optimization efficiency.

Visible light communication system that includes a controller unit (1) comprising processing means configured to employ a constellation decomposition on an original data signal by decomposing complex constellation symbols of a M-ary constellation into binary components defining n sub-constellation components. The system further comprises a plurality of emitter units (2), such as LEDs, installed within a communication environment, each capable of emitting data-encoded visible light signals to be received by at least a legitimate receiver unit (3). The controller unit (1) is configured to coordinate the operation of the emitter units (2), managing power levels and timing of signals to be transmitted by each emitter unit (2), in order to optimize the data transmission and security.

To provide a visible light communication system, a transmitter, a receiver, a method, and a program that more accurately detect a redundant frame including a transitory frame.SOLUTION: In the visible light communication system, a receiver 12 includes: a light reception unit 121 that receives an optical signal based on a modulated signal that is created by phase shift modulating and connecting together a training sequence having a predetermined value and a digital transmit signal, and generates a plurality of receive signals that correspond to light receiving elements, respectively, on the basis of the electrical charges accumulated in a plurality of sampling instruments that are exposed to light through a half cycle of the optical signal at different timing, respectively; and a demodulation unit 123 that estimates the phase of the modulated signal and estimates, on the basis of a section corresponding to the training sequence in the estimation result, the estimate value of a relative phase that represents a misalignment of phase between transmission and reception and the index of a redundant frame that includes a transitory frame at an exposure timing when symbols are switched. The demodulation unit adopts a frame closer to a timing at which symbols are switched, as the redundant frame.SELECTED DRAWING: Figure 6

This invention relates to the field of visible light communication technology, and more particularly to an integrated optical communication transmitter and its housing manufacturing method. Technical solution: The manufacturing method includes smoothing the inner wall of a connecting cylinder to form a continuous, smooth curved surface; wrapping a covering material around the outer wall of the connecting cylinder, and then curing the covering material to form a mounting cylinder with a microporous structure; electroplating the inner wall to form a refractive layer, thereby obtaining the housing. Technical effect: The housing obtained by this method avoids the problem in existing technologies where heat generated by the light source substrate is conducted to the transmitting cylinder, and the heat accumulates in the transmitting cylinder, causing the operating temperature of the light source substrate to rise, thus reducing the efficiency and stability of the transmitter.

The application provides a visible light communication method and system, comprising: for each communication terminal establishing a communication link, the communication terminal encrypts target transmission data based on a session key of the communication terminal, determines the encrypted target transmission data as encrypted data, generates a protocol frame based on the encrypted data, performs splicing processing on the protocol frame to obtain at least one frame data block, and transmits corresponding first light waves to a relay station according to a first transmission rule; the relay station transmits second light waves to a target communication terminal corresponding to the communication terminal according to a second transmission rule; and the target communication terminal corresponding to the communication terminal aggregates all frame data blocks to obtain aggregated frame data blocks, and decrypts the encrypted data in the aggregated frame data blocks to obtain target transmission data. The technical scheme provided by the application improves the security and anti-interference capability of visible light communication.

The present application relates to the technical field of visible light communication, and particularly relates to a LED fine feature extraction method, a LED individual identification method and a system in visible light communication, a signal transfer function model is constructed based on an LED equivalent circuit, and coefficients in the signal transfer function model are represented by equivalent parameters of components in the LED equivalent circuit; rising edge data in the visible light communication is extracted and preprocessed; the preprocessed rising edge data is taken as response data of a step input in the visible light communication, corresponding time domain signal transfer function model output is taken as measurement data of the step input in the visible light communication, the signal transfer function model is fitted based on the rising edge data and through a nonlinear least square algorithm, and the optimal coefficient solution is taken as a LED fine feature vector in the visible light communication. The present application avoids complex circuit parameter solving, and uses step response fitting fingerprint parameters, and can be used in security enhancement fields such as security authentication, intrusion detection and access control of an unmanned system based on optoelectronic devices.

The application discloses a receiver positioning and rotation angle estimation system based on a photodiode and an LED, proposes a new light positioning method and a rotation angle estimation method, and obtains a high-precision two-dimensional positioning result for the needs of indoor positioning, robot navigation, game equipment and the like. The method collects incident light signals through a PD array, and can directly obtain two-dimensional plane coordinates and a rotation angle of the receiver through a positioning algorithm and a rotation angle estimation algorithm. Compared with existing three-dimensional indoor light positioning methods such as an angle of arrival, a time of arrival and a received signal strength, the application has the advantages that: the application does not depend on a synchronous or demodulation system; the operation complexity is low; only a PD array is needed to receive a signal; the application can provide a centimeter-level precision within a certain range; the application can directly obtain a rotation angle estimation; the application does not depend on fixed light power; and the PD array can support high-speed visible light communication.

The application discloses a light supplementing lamp parameter wireless configuration method based on visible light communication and relates to the field of light supplementing lamps. The method multiplexes an existing light intensity sensor module in the light supplementing lamp to receive a visible light signal emitted by an external controllable light source and modulated according to a preset communication protocol, and a built-in MCU controller completes frame header identification, data analysis, verification and parameter configuration. Without the need of climbing operation and without the need of adding special communication hardware such as an infrared receiver, address allocation and parameter configuration of the light supplementing lamp installed at a high position can be remotely completed on the ground, and the debugging cost and safety risk in the scene of an expressway, a tunnel and the like are remarkably reduced.

The application discloses a visible light communication method, system, device, user terminal and readable storage medium, and belongs to the technical field of communication. The method applied to the user terminal comprises the following steps: receiving a wake-up message broadcasted by a visible light communication device integrated with a Bluetooth module through a Bluetooth signal; in response to the wake-up message, obtaining second identity information corresponding to the user terminal; if the second identity information matches first identity information, verifying the first verification information; if the first verification information is verified, performing a target wake-up operation based on the wake-up information; the target wake-up operation is used for waking up the user terminal and prompting the user to adjust the position of the user terminal until the visible light communication condition is met; in the case that the visible light communication condition is detected, sending communication connection information to the visible light communication device, and communicating with the visible light communication device through a visible light communication signal. The method can improve the reliability of visible light communication.

The application provides a compound eye type visible light multiple access communication method, and belongs to the technical field of visible light communication. The communication method fully utilizes the characteristics of a complex channel environment, designs a light receiving end composed of multiple PDs in a VLC system into a compound eye type multiple PD receiving layout mode, and provides a corresponding communication method according to the designed compound eye type PD receiving layout mode. Compared with using a single PD to realize data transmission of the VLC system, the application can fully utilize the characteristics of the complex channel environment, design the light receiving end composed of multiple PDs into the compound eye type receiving layout mode, not only can sufficiently utilize the visible light signals in the complex space scene, improve the received light signal strength, but also can multiplex the visible light communication channel, realize data communication transmission of multiple LEDs, and further improve the data transmission rate of the VLC system.

It is disclosed a method for enhancing security in visible light communication system, by employing constellation decomposition to provide physical layer security. By decomposing and transmitting signal constellations across multiple emitter units (2), that is, across multiple light sources, whose relative positions to a legitimate receiver unit (3) are known, the power and phase delay of each signal constellation are adjusted by a controller unit (1) to ensure that only legitimate receivers (3) are able to accurately reconstruct the transmitted data, thus preventing potential eavesdroppers.

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 performs switching control of switching from a state in which the visible light communicator performs visible light communication with a base station apparatus to a state in which the visible light communicator performs visible light communication with a base station apparatus.

The application discloses a design method of a vehicle visible light communication system model based on pedestrian interference, and belongs to the technical field of visible light communication. The method uses two headlamps of a vehicle as two transmitters, additionally sets two photodetectors as two receivers, uses diversity multiplexing technology, introduces a pedestrian interference model, uses a market weighted headlamp illumination intensity model and real road reflection data to establish a two-input two-output vehicle visible light communication system model, and specifically comprises the following steps: establishing the pedestrian interference model; establishing the headlamp illumination intensity model; analyzing received optical power of a line-of-sight link and a non-line-of-sight link; analyzing system noise; and analyzing a system received signal. The application establishes the model based on real traffic conditions, improves the authenticity of the system model, thereby improving the accuracy of experimental results, provides a theoretical basis for vehicle visible light communication, and has practical application value.

An invisible light communication system 100 comprises: a transmission unit TT that modulates and flashes invisible light-wavelength band light EL as invisible light and thereby transmits a signal; a light reception unit RR that receives the invisible light-wavelength band light EL; a first reading unit RU1 that reads a signal at a predetermined frame rate for a first range of an image acquired as a result of light reception by the light reception unit RR; and a second reading unit RU2 that reads a signal at a frame rate higher than that of the first reading unit RU1 for a second range more narrow than the first range.

This application discloses a visible light communication system and low-power transmission method based on a distributed passive front-end, relating to the field of visible light communication technology. The visible light communication system includes an access point (AP) and a user terminal. The AP and the user terminal communicate indoors via uplink and downlink. The AP includes a first laser, a first photodiode, a side-emitting optical fiber, and a scintillating optical fiber. The user terminal includes a second laser and a second photodiode. The side-emitting optical fiber receives a first optical signal emitted by the first laser and then emits it from the side, enabling the second photodiode to receive the first optical signal transmitted through a free-space channel and achieve downlink communication. The scintillating optical fiber receives a second optical signal emitted by the second laser, transmitted through a free-space channel, enabling the first photodiode to receive the second optical signal and achieve uplink communication. This reduces the complexity of the visible light communication system.

The application discloses a kind of space division multiple access parallel light communication methods, device and equipment based on Micro-LED array, it is related to visible light communication and intelligent transportation technical field.The application discloses a kind of space division multiple access parallel light communication methods, device and equipment based on Micro-LED array, it is related to visible light communication and intelligent transportation technical field.The application discloses a kind of space division multiple access parallel light communication methods, device and equipment based on Micro-LED array, it is related to visible light communication and intelligent transportation technical field.The application discloses a kind of space division multiple access parallel light communication methods, device and equipment based on Micro-LED array, it is related to visible light communication and intelligent transportation technical field.The application discloses a kind of space division multiple access parallel light communication methods, device and equipment based on Micro-LED array, it is related to visible light communication and intelligent transportation technical field.The application discloses a kind of space division multiple access parallel light communication methods, device and equipment based on Micro-LED array, it is related to visible light communication and intelligent transportation technical field.The application discloses a kind of space division multiple access parallel light communication methods, device and equipment based on Micro-LED array, it is related to visible light communication and intelligent transportation technical field.The application discloses a kind of space division multiple access parallel light communication methods, device and equipment based on Micro-LED array, it is related to visible light communication and intelligent transportation technical field.The application discloses a kind of space division multiple access parallel

The application discloses an LED positioning method and device based on visible light communication, comprising: mapping the model of each LED with the position information of the position where the LED is located; obtaining the visible light signal of the LED to be positioned, and extracting the target signal feature of the visible light signal; determining the target model of the LED to be positioned based on the target signal feature; and searching for the target position information matched with the target model in the mapping relationship, wherein the target position information is the position information of the LED to be positioned. In the above process, the positioning process of the LED to be positioned is converted into the identification process of the model of the LED to be positioned, the positioning efficiency is improved, and the problem that the existing positioning mode needs to allocate an ID for each LED, the LED needs to repeatedly send the ID information while performing visible light communication, and the terminal needs to distinguish the ID information and the communication information after receiving the signal, thereby causing a long time delay and greatly affecting the communication efficiency is avoided.

Disclosed is a method for implementing a rate-adaptive multi-input single-output visible light communication system, where the visible light communication system includes transmit ends and a receiver end. Binary transmission data streams corresponding to the transmit ends are respectively modulated onto a constellation diagram, and all transmit constellations are loaded onto a signal generator after subjected to digital signal processing, the signal generator outputs analog signals, which are respectively amplified by electrical amplifiers, and then coupled to direct current by biasers, and the light sources corresponding to the transmit ends convert the electric signals obtained by coupling into optical signals. The probabilistic shaping is performed on all the transmit constellations respectively so as to enable same to conform to Maxwell-Boltzmann distribution of a QAM constellation; and geometric shaping is performed on all the transmit constellations at the same time to make a transmit signal power of each transmit end equal.

The present application relates to a kind of VLC-RF network resource matching method based on martingale theory and reinforcement learning, the present application constructs visible light communication (Visible Light Communication, VLC)-radio frequency (Radio Frequency, RF) heterogeneous network switching service mechanism, deduces the state transition matrix of system service process.Based on martingale theory, network QoS parameters are evaluated, and queue reliability QoS, delay reliability QoS and jitter reliability QoS are combined to construct user satisfaction utility function.Finally, the service rate combination required by the system network is obtained using reinforcement learning to achieve optimal allocation of resources and improve network service efficiency.

This invention provides a relay device, a communication system, and a relay method that can significantly reduce processing delay and processing costs while utilizing VLC. [Solution] The relay device includes a wireless receiving unit having multiple receiving antennas that receive wireless communication signals by Multiple-Input Multiple-Output, MIMO; a frequency conversion unit that converts the wireless communication signals received via the multiple receiving antennas into individual signals of different frequency bands for each receiving antenna; a radio wave-to-optical conversion unit that converts each of the individual signals into a visible light communication signal using visible light; and a visible light transmission unit that transmits multiple visible light communication signals toward a wireless communication signal destination device.

The present disclosure relates to an information processing apparatus and an information processing method. In the information processing apparatus of the present disclosure, when a utilization start request of a first vehicle is received from a first terminal, a control section transmits a first instruction to transmit first identification information of the first vehicle by visible light communication to the first vehicle. Thereafter, when a first signal containing second identification information as identification information of a first user and the first identification information is received from the first terminal, the control section transmits a digital key of the first vehicle to the first terminal on condition that the second identification information contained in the first signal coincides with third identification information that is previously associated with the first identification information.

It is disclosed a method for enhancing security in visible light communication system, by employing constellation decomposition to provide physical layer security. By decomposing and transmitting signal constellations across multiple emitter units (2), that is, across multiple light sources, whose relative positions to a legitimate receiver unit (3) are known, the power and phase delay of each signal constellation are adjusted by a controller unit (1) to ensure that only legitimate receivers (3) are able to accurately reconstruct the transmitted data, thus preventing potential eavesdroppers.