713results about "Close-range type systems" patented technology

The invention discloses a DALI equipment dynamic addressing and automatic address configuration method based on a LiFi technology, and relates to the technical field of intelligent lighting. Building a LiFi network and setting a communication protocol; equipment physical deployment and initialization; triggering an equipment discovery mechanism; the device responds to and recognizes interaction; address allocation and conflict detection; address configuration issuing and device activation; and carrying out configuration recording and fault processing. According to the dynamic addressing and automatic address configuration method combining the LiFi technology and the DALI device, the DALI slave device and the main controller are modified to enable the DALI device to have the compatibility of LiFi communication and a DALI protocol, automatic discovery, address allocation and conflict detection of the device are achieved through the LiFi network, the configuration process of a traditional DALI system is optimized, and the configuration efficiency of the DALI system is improved. High-speed data transmission and encryption of a configuration instruction are realized through a LiFi channel, and automatic configuration and stability of equipment are ensured.

The invention relates to the field of optical communication, and provides a free space optical communication-based full-duplex signal transmission device, which comprises a rotatable first device and a rotatable second device, the rotation axes of the first device and the second device coincide; when the first device and / or the second device rotate around the rotation axis, an optical signal transmitted by the first laser transmitter is always received by the first laser receiver, so that the intensity of light received by the first laser receiver is not changed during rotation; and when the first device and / or the second device rotate around the rotation axis, the optical signal transmitted by the second laser transmitter is received by one second laser receiver or at least two adjacent second laser receivers. According to the invention, high-speed full-duplex signal transmission in a rotation state can be realized, transmission rates such as 10Gbps and 25Gbps are supported, the sizes of the first device and the second device are as small as several millimeters, the size is small, and the weight is light.

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.

The invention relates to an Optical Front-end, OFE, (400) for Optical Wireless Communication, OWC, the OFE comprising: an optical receiver with at least a photodetector (102a) and a trans-impedance amplifier, and a two-dimensional array of optical transmitters (103a) each having an individual transmitter field-of-view, and one or more drivers, the two-dimensional array arranged to create a combined transmitter field of view that is larger than 5 the individual transmitter field of view, the plurality of optical transmitters arranged such that optical axes of the plurality of optical transmitters are evenly distributed within the combined transmitter field of view.

The invention relates to the technical field of free space optical communication, and discloses a wireless optical communication device which comprises a transmitting end and a receiving end. The transmitting end comprises an information source generation unit, a coding unit, a modulation unit, a driving unit, a light source unit and a transmitting optical assembly; the receiving end comprises a receiving optical assembly, a CCD camera, a signal processing unit, a demodulation unit and a decoding unit; in actual use, wireless communication is carried out through the optical medium, the communication medium is safe, and the problems of active electromagnetic silence and passive electromagnetic suppression do not need to be worried about; the coverage range of visible light is wide, the communication range is wide, and deployment is convenient; in addition, communication is carried out through the CCD camera, so that the original CCD camera can be replaced in some scenes where the CCD camera is installed, and image shooting and wireless optical communication can be realized at the same time.

A receiver of an optical communication system includes an organic photoelectric conversion device configured to convert optical signals received from a transmitter into an electrical signal; and a demodulator configured to input the electrical signal to a trained artificial neural network and demodulate the electrical signal based on an output of the trained artificial neural network.

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.

Methods, systems, and devices for connection setup in an orbital angular momentum (OAM)-based communication system are described. A first device and a second device may establish an OAM communications connection between the devices. The first device and the second device may exchange a series of messages over a downlink communications link and an uplink communications link according to an OAM mode. Based on OAM related parameters or OAM related information included in the messages, the first device and the second device may achieve a successful directional alignment (co-axial alignment) between the first device and the second device. The first device and the second device may determine one or more orbital angular momentum modes for communication between the first device and the second device based on the establishing the directional alignment.

An optical wireless communication (OWC) interface apparatus comprises: at least one input and / or output configured to transfer data signals from and / or to a bus device; optical interface circuitry configured to transfer optical wireless communication (OWC) signals representative of the data signals between the OWC interface apparatus and a light transmitter and / or receiver apparatus, wherein the light transmitter and / or receiver apparatus is configured to transmit and / or receive the OWC signals as free-space light signals; and interface control circuitry that is configured to establish and / or maintain communication with the bus device in accordance with a bus protocol thereby to enable transfer of the data signals between the OWC interface apparatus and the bus device.

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.

A device may include a processor, a receiver, and a transmitter. The receiver may be configured to receive a content signal. The transmitter may be configured to transmit the content signal. The transmitter may be configured to transmit an associated inaudible signal. The content signal, the associated inaudible signal, or both, may be transmitted to one or more electronic devices. Each of the one or more electronic devices may be configured with audio interfaces. The receiver may be configured to receive a respective message from each of the one or more electronic devices. Each respective message may be based on the associated inaudible signal. Each respective message may include a respective electronic device identifier. The transmitter may be configured to transmit one of the respective messages.

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 invention discloses a bridging T-shaped photovoltaic array and a visible light information and energy simultaneous transmission system, the bridging T-shaped photovoltaic array comprises n array units connected in parallel, an input resistor and an output resistor, and each array unit comprises m photovoltaic cells connected in series, a first inductor, a second inductor and a capacitor; the negative electrode ends of the m photovoltaic cells connected in series are grounded; the anode end of the first array unit is simultaneously connected with the cathode of the first inductor and the cathode of the second inductor; the anode of the first inductor is connected to the anode of the capacitor; the anode of the second inductor is connected to the cathode of the capacitor; the n array units are sequentially connected in parallel through the output ends and the input ends of the array units; according to the invention, significant and robust improvement can be realized in two aspects of energy collection and communication performance.

The invention relates to a laser communication terminal coarse tracking control system, and relates to the technical field of laser communication, the system comprises a turntable module and a data control processing module, the turntable module comprises an azimuth angle turntable and a pitch angle turntable, the pitch angle turntable is provided with a mounting rack through a connecting piece, and the upper end of the mounting rack is provided with a coarse tracking camera; the mounting frame is used for capturing the target light spot position and transmitting the target light spot position to the data processing control module, a support is fixedly arranged on one side of the upper end of the mounting frame, and an infrared camera is fixedly arranged at one end of the support. According to the application, the coarse tracking camera is arranged, the infrared camera is arranged at the upper end of the mounting frame, and the infrared camera can filter ambient visible light clutters due to high penetrability of infrared light to a target light source, so that a clear light spot image is generated, and the problem that a traditional single camera cannot be used in a complex light environment is solved. And furthermore, the success rate of target light source capturing is improved.

Methods, systems, and devices for adaptive sensors are described. A system may acquire physiological data from a user via multiple optical channels of a wearable device, where each optical channel includes a light-emitting component and a photodetector. The system may determine respective measurement quality metrics and respective power consumption metrics associated with each optical channel based on the physiological data. Additionally, the system may select one or more optical channels of the multiple optical channels of the wearable device based on a comparison of the respective measurement quality metrics and the respective power consumption metrics associated with each optical channel. The system may acquire additional physiological data using the one or more optical channels based on the selecting.

The invention provides a positioning method and system based on a visible light communication technology, and particularly relates to the technical field of indoor visible light positioning. According to the method, a plurality of visible light emitters emit modulated light signals, the modulated light signals are received by a prismatic table phased array receiving terminal, the terminal is provided with a plurality of receiving surfaces, and each receiving surface comprises a plurality of light detection units. And multi-stage differential noise reduction processing is carried out on the electric signals output by the light detection units of the receiving surfaces, the multi-stage differential noise reduction processing comprises first-stage differential suppression of local noise in the receiving surfaces and second-stage differential suppression of reflected light interference between the receiving surfaces, and a light intensity response value is obtained. The distance between the terminal and each transmitter is calculated through filtering processing and a distance calculation model based on a light intensity response value, and then the position of the terminal is determined by using a multilateral positioning algorithm, so that centimeter-level precision positioning in an electromagnetic sensitive environment is realized, and electromagnetic interference and explosion-proof risks are avoided.

The invention discloses a near-field optical communication system and method. The near-field optical communication system comprises a transmitting end and a receiving end. The transmitting end comprises a light transmitting assembly, a signal change-over switch and a transmitting end controller. The receiving end comprises an optical receiving assembly and a receiving end controller. The transmitting end controller controls the signal change-over switch to enable the light transmitting assemblies to transmit light signals respectively, and the receiving end controller controls the signal change-over switch to enable the light receiving assemblies to transmit light signals after the light receiving assemblies receive the light signals transmitted by the light transmitting assemblies. And sending the obtained information corresponding to the optical signal intensity of each optical transmitting component or the information of the optical transmitting component with the highest optical signal intensity to a transmitting end controller, so that the transmitting end controller selects the optical transmitting component which is optimally matched with the receiving end for subsequent optical communication. The near-field optical communication system and the near-field optical communication method can realize optical communication with high bandwidth and low alignment precision requirement in a near field.

Transmitter device (99) transmitting by means of optical radiation (108), said device being characterized in that it comprises at least one modulator stage (101 ) comprising: - an input (105) adapted to receive during use an electrical signal (s(t)) to be modulated, and - an output (107) transmitting, towards at least one photoemitter (100), a voltage or current driving signal (v7(t), i7(t)) for which said electrical signal (s(t)) represents a modulating signal, where said at least one photoemitter (100) transmits an optical radiation (108) with radiation intensity lr(t) variable in accordance with said driving signal (v7(t), i7(t)), and wherein, between said input and said output of said modulator stage (107), a cascade of a first AM modulator (102) and of a second FM modulator (103) is present, said FM modulator (103) being placed downstream of said AM modulator (102) and having an own output directly connected with the output (107) of said modulator stage (101 ), wherein said AM modulator (102) has an input directly connected to said input (105) of said modulator stage and is directly supplied by means of said electrical signal (s(t)) to be modulated and wherein said AM modulator (102) has an output on which it generates an intermediate signal (s2(t)) supplied as an input to said FM modulator (103). The present invention also regards a receiver device, also multi-channel, and methods for transmission and modulation, and reception and demodulation, employing a hybrid AM modulation / FM.

A lighting apparatus includes a light source, a power module, a controller, a data input module, a serial-to-parallel converter module, an orthogonal frequency division multiplexing (OFDM) modulation module, a radio frequency (RF) upconversion module and an antenna module. The light source including multiple types of LED modules. The controller generates multiple driving currents supplied to the LED modules. The data input module is coupled to the controller. The data input module receives input data to be transmitted. The serial-to-parallel converter module converts the input data into multiple parallel data streams. The orthogonal frequency division multiplexing (OFDM) modulation module modulates the parallel data streams onto multiple orthogonal subcarriers. The antenna module includes multiple antennas configured to transmit RF signals corresponding to the multiple data streams.

The application discloses an intelligent road system for vehicle-road cooperation safety warning and relates to the technical field of vehicle-road cooperation warning, and comprises a communication evaluation module, an optimal communication path is input into a communication mapping model, a space matching layer is used for fusing road geometry and communication topology, a state mapping layer is used for marking signal strength and stud node state, and a communication quality heat map is generated; a risk decision module is used for evaluating the risk level of each region based on the communication quality heat map and outputting priority transmission parameters; and an information transmission module is used for starting an audible and visual alarm according to the priority transmission parameters, acquiring an execution state report, and feeding back the execution state report to a command center. Through the construction of the communication mapping model and the dynamic generation of the priority transmission parameters, the application improves the precision of communication state evaluation, realizes efficient cooperative processing of multi-source alarm information and intelligent allocation of priorities.

A novel exemplary system uses a laser beam generated by a transmitter unit at a base station to detect, communicate with, and control devices, typically battery-operated, installed in public places. The interaction of the laser beam with the device uses a laser detector module in the device selected to emit a fluorescent signal upon laser beam impingement. A fluorescent detector is installed at the base station to detect incoherent fluorescent light emitted by the device when the laser impinges on the device. A wireless data link may implement the exchange of information and commands between the base station and the device, which may be required following explicit detection of fluorescent emission from the device. The system may use a laser beam in the short-wave infrared (SWIR) region. The detector may provide power to the device for its operation and / or to maintain the charge of an installed battery.

This invention relates to the field of optical communication, providing a method, system, device, product, and medium for optimizing the energy efficiency of multi-access point optical communication. The method includes: calculating the link channel gain to obtain the composite channel gain; obtaining the received energy at the receiver; establishing a nonlinear received energy expression based on the received energy; constructing a battery dynamics model using the nonlinear received energy expression to obtain device energy constraints; establishing a arrival Markov matrix and a service Markov matrix based on the number of participating communication devices and their obstruction states; calculating the arrival martingale and service martingale; calculating the queue length change based on the arrival martingale and service martingale; establishing a delay default probability inequality through the queue length change to obtain an upper bound on the delay default probability; establishing communication optimization constraints; constructing a multivariate optimization equation; solving the multivariate optimization equation based on the communication optimization constraints to obtain communication optimization parameters; and optimizing the optical communication using these communication optimization parameters.

The application discloses a kind of based on visible light positioning's middle-low altitude unmanned aerial vehicle cooperative navigation and communication method, method includes middle space reference unmanned aerial vehicle by image matching positioning obtains accurate three-dimensional position of itself, calibrates the absolute space coordinates of each LED in LED array, using frequency division multiplexing control LED array downward emission while carrying the superposition signal of positioning signal and communication signal, form visible light signal;Low altitude unmanned aerial vehicle to be positioned by single photoelectric detector receives visible light signal, sequentially executes signal windowing, FFT transform and RSS vector extraction operation, then denoising by Transform deep learning network, power function attenuation model ranging, combined with PPO reinforcement learning algorithm adaptive output positioning parameter, obtain accurate three-dimensional coordinates of itself by weighted least squares solution;Low altitude unmanned aerial vehicle to be positioned by FFT, Morlet wavelet transform, hilbert transform three-stage joint decoding separation analytical communication signal, combined with forward error correction and CRC check realizes the two-way communication between middle-low altitude unmanned aerial vehicle.

Various embodiments are described herein for a device, system, and method for identifying a location of an ingestible device within a gastrointestinal tract of a body. In some embodiments, the ingestible device includes a sensing unit with an axial optical sensing sub-unit located proximal to at least one end of the device, and a radial optical sensing sub-unit located proximal to a radial wall of the device, and may autonomously identify a location within the gastrointestinal tract. In some embodiments, the ingestible device includes optical illumination sources and detectors that operate at a plurality of different wavelengths, and may discern regions of a gastrointestinal tract by using the reflection properties of organ tissue and occasional particulates. In some embodiments, the ingestible device may sample fluid or release medicament based on a detected device location.