43 results about "Optical wireless" patented technology

The invention relates to the technical field of intelligent peripherals, in particular to a user-oriented interaction information expansion method, which comprises the following steps that: each keycap acquires displacement and pressure, generates an event packet, uploads the event packet through an optical wireless link, and obtains a clock and supplies power; constructing a keycap graph by a master controller, obtaining an intention vector through graph convolution and pooling, inputting the intention vector into a cyclic network to generate a pixel matrix and a phase matrix, and downlink after Bernoulli sparse coding; performing key cap side orthogonal matching pursuit decoding and four-round gradient optimization, and outputting a differential pixel set, a differential phase set and a synchronization mark; the master control refreshes the digital micromirror array and the ultrasonic phased array in a differential manner, locks a frame-level time sequence through a synchronization pulse, compensates link delay and hardware drift in real time based on Kalman filtering, and keeps an optical-acoustic alignment error to be less than 100 microseconds; degradation monitoring enables a link to be automatically switched to a pre-carved character layer and to be quickly recovered when the link is abnormal, and a keyboard interaction information expansion scheme with low delay and high consistency is provided.

The invention provides a short-distance ultra-high-speed optical wireless transmission method and device, and relates to the technical field of signal transmission. The short-distance ultrahigh-speed optical wireless transmission device comprises a transmitting module and a receiving module, the transmitting module comprises a multi-wavelength light source unit, a modulation unit, a self-adaptive control unit and a transmitting optical unit, and the receiving module comprises a receiving optical unit, a photoelectric conversion unit, a signal compensation unit and a demodulation unit. The short-distance ultrahigh-speed optical wireless transmission method and the short-distance ultrahigh-speed optical wireless transmission device have ultrahigh speed, have Tbps-level theoretical speed through multi-wavelength parallel transmission and efficient modulation technologies, have high reliability, improve anti-interference capability through adaptive modulation and machine learning compensation technologies, have scene adaptability, and can be applied to the field of wireless transmission. The system can adapt to various special application scenes such as unmanned aerial vehicles, underwater equipment and mobile vehicles, can be flexibly deployed, and supports intermittent connection of mobile equipment.

To provide a safety monitoring system for wireless power transmission applied to a laser beam system for supplying power to and charging a portable electronic device.SOLUTION: In a safety monitoring system, a power delivery system includes a transmitter having a beam generator to transmit power to a receiver that converts the beam to power. A system control unit stores a known signature categorized by a predetermined parameter associated with one or more undesirable situations and data from a sensor, compares the stored data with the signature, and performs one or more responses based on the comparison. The power delivery system also includes a hazard detection system 4003 adapted to monitor the transmitter and the system control unit to switch the beam generator to a safe state at the time of detection of a malfunction of the transmitter and control unit, and further to prevent exposure of a person to a beam intensity above a predetermined safe level.SELECTED DRAWING: Figure 3

To provide a laser-based transmission system that radiates optical power in a beam to a mobile electronic device in a home environment.SOLUTION: A transmitter 21 that incorporates a safety system 31 and transmits optical power to a receiver 22 includes an optical resonator having multiple mirrors 9, 10 and a gain medium 11, a laser driver 12 that supplies power to the gain medium to control its small-signal gain, a beam steering device 14, and a controller 13 that controls at least the beam steering device and the laser driver. The controller outputs instructions for changing at least some of the small-signal gain of the gain medium, the radiant intensity of an optical beam 15, power supplied by the driver, and the scan speed or scan direction and position of the beam steering device or instructions for registering a scan attitude that determines the arrangement of the optical / power converter, thereby responds to safety risks arising in the system, ensures high overall radiant intensity efficiency, and can warn that the target receiver is not receiving the transmitted power.SELECTED DRAWING: Figure 19

A system for transmitting laser power to a remote receiver, comprising a laser diode, an optical system for collimating and focusing the laser beam to the receiver, and a scanning system for directing the beam towards the receiver. The beam has a wavelength of 1150 to 1550 nm, a power exceeding 300 mW, an emitter width of 15 to 250 μm, is a spatial multimode beam, and more than 50% of its power is transmitted via TEM. 00 In the mode, less than 15% of its power, and a higher-order TEM with more than 20 (n+m) nm The mode has a laser oscillation cavity with a Fresnel number between 0.01 and 20, and a low-speed axis M of less than 15. 2 , high-speed axis M less than 1.5 2 It has a high-speed axial divergence angle exceeding 60°. The collimated laser beam has a single lobe when imaged up to a range of 10 meters.

A system for use on a vehicle includes an electronic controller, a sensor device, an optical wireless transmission device, a cable infrastructure having a first end connected to the electronic controller, and an interface connected between a second end of the cable infrastructure and the sensor device and the optical wireless transmission device. The interface is operable to select, on a time sharing basis, between using the cable infrastructure for: i) a first function to communicate input data sensed by the sensor device to the electronic controller, and ii) a second function of transmitting the output data from the electronic controller to the optical wireless transmission device for optical transmission from the optical wireless transmission device; wherein the interface is configured to perform the selection depending on a state of motion of the vehicle.

A system for measuring power of a laser beam includes a substantially opaque housing from which the laser beam is directed through an exit aperture. The housing includes: a beam splitter configured to transmit a primary portion of the laser beam through the exit aperture and to reflect a secondary portion of the laser beam; a diffuser element positioned such that a reflected secondary portion of the laser beam impinges thereon; at least one detector element in optical communication with the diffuser element, the detector element providing a signal in response to diffused light of the secondary portion of the laser beam impinging thereon; and an absorber element positioned such that a portion of any light that enters the housing through the exit aperture and is reflected by the beam splitter impinges on the absorber element and is substantially absorbed.

An optical wireless power delivery system to provide power to a medical implant device includes a battery pack, a flexible adhesive device and a medical implant assembly. The flexible adhesive device is attached a subject's skin and include a port to receive electrical power from the battery pack and to power the one or more LED light assemblies that transmit a plurality of light beams to a skin or tissue of the subject. The medical implant assembly has a photovoltaic assembly to receive the plurality of light beams and convert the plurality of light beams to electrical power. The electrical power is transferred to the battery charger controller, which charges the rechargeable battery and provides electrical power to the medical implant device.

The invention belongs to the technical field of optical communication, and particularly discloses an optical fiber-visible light converged communication system for transmitting end signal reverse probabilistic shaping. According to the method, carrier waves are injected into a base band, a single side band signal is formed, a KK receiving scheme meeting the minimum phase condition is combined with an RPS strategy of distributing constellation probability to an outer ring, efficient and steady recovery of a mixed link receiving signal under the conditions of low signal-to-noise ratio and limited peak power is achieved, and the method has the advantages of being simple in structure and convenient to operate. And the phase reconstruction reliability is improved by setting a proper carrier signal power ratio. The method overcomes the defects of insufficient stability of peak constraint and phase recovery when strong carrier waves and low signal-to-noise ratio coexist in a traditional direct detection link and high peak-to-average power ratio and aggravated mutual information degradation of conventional probability shaping under the low signal-to-noise ratio, has higher noise immunity and spectral efficiency, and can be applied to the field of wireless communication. The method is a feasible scheme for a 6G indoor optical wireless access and optical fiber wireless optical integrated network.

To provide a wireless optical communication system and method capable of excellently performing optical communication regardless of the kind or the like of a receive coil unit attached to a subject.SOLUTION: A wireless optical communication system includes: a first optical communication device of an optical wireless module 200B connected to a receive coil unit 200 attached to a subject 102; and two or more second optical communication devices 10a to 10d that are respectively provided at a front-side position and a back-side position in a bore 120 of a gantry 110 of an MRI apparatus and are capable of performing wireless optical communication with the first optical communication device. A processor acquires link-up check information indicating which of the two or more second optical communication devices 10a to 10d is to be used by optical communication between the first optical communication device and the second optical communication devices 10a to 10d before main scanning by the MRI apparatus is started, and selects the second optical communication device to be used for the main scanning from the two or more second optical communication devices 10a to 10d based on the link-up check information and uses the selected second optical communication device.SELECTED DRAWING: Figure 6

Methods and systems for enabling secure communication between a wireless charging system and at least one external device. The wireless charging system comprises at least one transmitter for supplying receiver(s) with wireless power. The external device may be used to control the wireless charging system by updating configuration files, instructing the transmitter as to which receiver to supply power to, and to supply billing information to enable receiver(s) to pay for wireless charging. The wireless charging system may provide the external device with data, such as receiver details, or images of the vicinity around the transmitter or receiver. The system only carries out the above if a key is presented to the wireless charging system. The key may be a physical key inserted into a component of the wireless charging system, such as into the transmitter, or a numeric key received by the wireless charging system.

A wireless communication system includes: a first optical communication device of an optical wireless module that is connected to a receive coil unit attached to a subject; and two or more second optical communication devices that are provided at a front-side position and a back-side position in a bore of a gantry of an MRI apparatus and capable of performing wireless optical communication with the first optical communication device. A processor is configured to: acquire link-up check information indicating which of the second optical communication devices is to be used through the optical communication between the first optical communication device and the second optical communication devices before main scanning by the MRI apparatus is started; and select a second optical communication device to be used for the main scanning from the second optical communication devices based on the link-up check information and use the selected second optical communication device.

The invention discloses a method and a system for improving the capacity of a digital-analog hybrid optical fiber wireless system based on time-interleaved index modulation. According to the TI-IM (Time-Interleaved Index-Modulated) DA-RoF method, at a sending end, a communication signal is decomposed into a digital component and an analog residual component after being subjected to DA modulation, and an additional index bit is mapped into a time interleaving selection vector which is used for controlling the arrangement sequence of the digital component and the analog component in a plurality of time slots; and at a receiving end, synchronous recovery of the index information and the original communication data is realized through time de-interleaving and joint judgment based on a maximum likelihood criterion. According to the method, the signal dimension is expanded while the signal-to-noise ratio advantage brought by a DA-RoF system is kept, the communication capacity is remarkably improved, and the method has good system compatibility and engineering realizability and is suitable for future high-speed mobile forward pass and 6G optical wireless fusion networks.

A method coordinates access points having coverage areas each subdivided into an exclusive sub-area supplemented by an interference sub-area where they overlap and forming part of an optical wireless network. The method includes a procedure including, for each time channel, a first sub-procedure wherein each interface device located in an exclusive sub-area of an access point is allocated an authorized free time slot in the time channel, a second sub-procedure wherein, as long as there remains an interface device without an allocated time slot in an interference sub-area, for each free time slot: a set of interface devices compatible with it is determined, if this set is not empty, an interface device is allocated this free time slot which is compatible with an available access point according to a chosen heuristic, otherwise the time slot is not free, the second sub-step is performed again.

An OWC subsystem (400) to establish bidirectional optical data communication with a remote OWC subsystem comprises: a bundle of fiber cores (405) arranged in a predetermined shape; an optical transceiver (401) to transmit and receive data beams via a first fiber core; an auxiliary beacon transmitter (402); at least two auxiliary beacon receivers (403) each to receive a respective beacon beam from the remote OWC subsystem via a respective fiber core; the fiber splitter (404) to split a beacon beam from the auxiliary beacon transmitter (402) into at least two transmit beacon beams and provide each of these transmit beacon beams to a respective fiber core; and a collimator (407) to focus the data and / or beacon beams from the remote OWC subsystem towards a common end core face (406) of the bundle (405) and collimate the data and / or transmit beacon beams from the common end core face (406).

To provide a wireless laser power system having a safety system.SOLUTION: The failsafe wireless power transmission system comprises a transmitter (761) and a receiver (762), wherein the transmitter comprises a receiver function monitoring unit, a transmitter function monitoring unit and at least two sensors (767 to 772) and has at least one low emission state (773) and at least one high emission state (774), wherein the high emission state comprises higher emissions and a more complex safety system. The transmitter is prevented from switching from either the low emission state to the high emission state upon detection of a malfunction of the receiver control unit, a malfunction of the transmitter control unit, a likelihood of human-accessible emissions from the system being greater than a predetermined level, or a mismatch between results from at least two of the sensors.SELECTED DRAWING: Figure 7

1. A system for use on a vehicle, the system including: an electronic controller; a sensor device; an optical wireless transmitting device; a cable infrastructure having a first end connected to the electronic controller; and an interface connected between a second end of the cable infrastructure and the sensor device and the optical wireless transmitting device, the interface operable to select, on a time-shared basis, between i) using the cable infrastructure for a first function of forwarding upstream data sensed by the sensor device to the electronic controller, and ii) using the cable infrastructure for a second function of forwarding downstream data from the electronic controller to the optical wireless transmitting device to be optically transmitted from the optical wireless transmitting device, the interface configured to make the selection dependent on a motional state of the vehicle.

The invention relates to the technical field of visible light communication, and provides an optical wireless FDM signal generation method and system for LIFI, and the method comprises the steps: receiving a unique clock signal and a to-be-transmitted digital bit stream through an FPGA, and generating multiple paths of synchronous digital clock signals based on the clock signal; distributing a digital bit stream to be transmitted to a corresponding FDM channel in the FPGA, and performing synchronization processing by using a digital clock signal; modulating a to-be-transmitted digital bit stream of each FDM channel to a corresponding subcarrier frequency to obtain multiple paths of digital domain FDM signals, and performing filtering and superposition processing on the multiple paths of digital domain FDM signals to obtain multiple paths of analog signals; and combining the multiple paths of analog signals in an analog domain to obtain a composite analog signal, and inputting the composite analog signal into an LED to emit a composite light FDM signal. According to the scheme, the problems of high hardware complexity, large PAPR and difficult channel synchronization in the existing LiFi system are solved.

Provided are a cableless optical wireless unit that can avoid electromagnetic wave interference and has good usability, and a magnetic resonance imaging apparatus including the same. An optical wireless unit that is connected to a receive coil unit including a plurality of coil elements via a connector, the optical wireless unit including: a cableless housing, in which the housing includes a battery that supplies electricity to the receive coil unit, and an optical transceiver that converts signal data received from the receive coil unit into an optical wireless signal and transmits the optical wireless signal, and that receives and converts a control signal transmitted by the optical wireless transmission into an electrical signal.

The present invention provides a fractional-order digital-analog hybrid fronthaul method and system, comprising: a signal processing and transmission step: at the transmitting end, splitting the wireless signal into two parts, performing different-order digital-analog hybrid modulation on the two parts, and then performing frequency division multiplexing to achieve fractional bandwidth expansion; a signal reception and processing step: at the receiving end, demodulating the two different-order digital-analog hybrid optical wireless signals to recover the wireless signal. By adopting fractional-order digital-analog hybrid modulation, the present invention overcomes the problem that conventional digital-analog hybrid modulation can only achieve integer-multiple bandwidth expansion, thereby achieving the effect of improving the flexibility of the fronthaul system.

A technique for performing time synchronization between a master device and a slave device is disclosed. A method implementation of the technique is performed by the master device and comprises transmitting, using optical wireless signals, a timestamp representative of a clock time of the master device to the slave device, wherein the timestamp is encoded using a color-based optical coding scheme and is to be used by the slave device to set a clock time of the slave device in accordance with the timestamp to thereby synchronize the clock time of the slave device with the clock time of the master device.

A wireless optical communication system includes: a first optical communication device of an optical wireless module that is connected to a receive coil unit attached to a subject; and first and second arm mechanisms that are provided on a pair of a first wall and a second wall of an examination room, respectively, and are capable of moving second optical communication devices to a front position or a rear position of a bore of a gantry. A processor acquires link-up check information indicating either the front position or the rear position of the bore as a position of the second optical communication device during main scanning and controls the first arm mechanism or the second arm mechanism based on the link-up check information such that the second optical communication device is moved to the selected front position or rear position.

A fail-safe wireless power transmission system having a transmitter, a receiver, a receiver functionality monitor unit, a transmitter functionality monitor unit and at least two sensors. The transmitter has at least one low emission state, and at least one high emission state, the high emission states having higher emissions and more complex safety systems. The transmitter may be precluded from switching from a low emission state to any high emission states upon detection of a receiver control unit malfunction, a transmitter control unit malfunction, a likelihood of human-accessible emission from the system greater than a predetermined level, or an inconsistency between results arising from at least two of the sensors. Two different methods of such preclusion may be used simultaneously or consecutively to improve reliability. A transmitter control unit analyzes data from the sensors, and performs calculations to determine if and what type of preclusion is needed.

A handheld light communication system and a device incorporating components of a handheld light communication system are provided. The handheld light communication system includes: a transmitter configured to transmit light; and a receiver configured to determine data encoded in the light transmitted by the transmitter. The receiver includes: a light sensor for sensing the light transmitted by the transmitter; analog circuitry configured to generate a conditioned analog signal based on a light signal that is output from the light sensor; and a digital signal processing device configured to recover a clock of the light transmitted by the transmitter by processing the conditioned analog signal and to decode the data encoded in the light using the clock.

An optical wireless power transmission system incorporated into a lighting fixture, that is easily installable. The optical wireless power transmitter unit is contained within a housing that has a standard electrical light fitting connector. Consequently, it can be installed by simply inserting into a matching light socket mounted in the ceiling or high on a wall of the room, and is powered by the existing AC mains power supply of that light fitting socket. The housing is further fitted with a light source, such that the device maintains its function of also supplying illumination to the room. Since the light socket has only a single current input capability, the wireless power transmitter functionality is maintained on, while the illumination functionality is switched ON and OFF by a remotely generated signal, such as from a remotely controlled hand held unit, or from a communication link in the switch.

An optical wireless device with a receiving device is configured to receive an optical wireless signal. The receiving device includes an optical detector for detecting the optical wireless signal and a plurality of optical systems with at least a first optical system with a first aperture size and a second optical system with a second, smaller aperture size. The optical systems are arranged side by side and essentially in the same advantageous direction. Each of the plurality of optical systems is configured to simultaneously direct a light incident on the optical system to the optical detector. The optical detector has an optical axis and the first optical system is arranged at a first distance from the optical axis and the second optical system is arranged at a greater second distance from the optical axis.

The invention relates to the technical field of information acquisition and positioning, in particular to a low-power-consumption non-cooperative optical wireless sparse pulse positioning method and device, and the device comprises a plurality of optical wireless transmitters which are randomly distributed and asynchronously transmit random pulse signals, and an optical receiver which is used for receiving the signals transmitted by the plurality of optical wireless transmitters. And positioning information is output through the optical receiver, so that the problem that the requirements of high precision, low power consumption, low cost and strong anti-interference are difficult to meet at the same time in the pulse signal transmission process is solved.

A device for transmitting optical wireless signals comprises a signal source for providing at least one signal and a plurality of spatially distributed optical transmitters for transmitting a corresponding plurality of optical wireless signals. Furthermore, a synchronization device is arranged, configured to convert the at least one signal for the plurality of optical transmitters into a corresponding plurality of mutually synchronized input signals. Based on the at least one signal, the plurality of optical transmitters transmit the plurality of optical wireless signals as mutually synchronized optical wireless signals in a spatially distributed manner, based on the plurality of mutually synchronized input signals.