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18 results about "Optical wireless communications" patented technology
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Optical wireless communications (OWC) is a form of optical communication in which unguided visible, infrared (IR), or ultraviolet (UV) light is used to carry a signal. OWC systems operating in the visible band (390–750 nm) are commonly referred to as visible light communication (VLC). VLC systems take advantage of light emitting diodes (LEDs) which can be pulsed at very high speeds without noticeable effect on the lighting output and human eye. VLC can be possibly used in a wide range of applications including wireless local area networks, wireless personal area networks and vehicular networks among others. On the other hand, terrestrial point-to-point OWC systems, also known as the free space optical (FSO) systems, operate at the near IR frequencies (750–1600 nm). These systems typically use laser transmitters and offer a cost-effective protocol-transparent link with high data rates, i.e., 10 Gbit/s per wavelength, and provide a potential solution for the backhaul bottleneck. There has also been a growing interest on ultraviolet communication (UVC) as a result of recent progress in solid state optical sources/detectors operating within solar-blind UV spectrum (200–280 nm). In this so-called deep UV band, solar radiation is negligible at the ground level and this makes possible the design of photon-counting detectors with wide field-of-view receivers that increase the received energy with little additional background noise. Such designs are particularly useful for outdoor non-line-of-sight configurations to support low power short-range UVC such as in wireless sensor and ad-hoc networks.
Interference mitigation
An optical wireless communication OWC network (100) includes multiple access points (120) for communicating with multiple endpoint devices (110) via modulated light. A control system (13) receives a report of an indicated time slot during which a first access point (120a) detects an event indicating interference and transmits the indication of the time slot to at least one other access point (120b). The other access points (120b) provide the control system (13) with identifiers of any registered endpoint devices that have used or are using the time slot. If the control system (13) receives the identifier of a single endpoint device from the other access points (120b), it identifies that endpoint device as the cause of the interference experienced at the first access point (120a). If the control system (13) receives the identifiers of multiple endpoint devices from the other access points (120), it causes the endpoint devices in the OWC network (100) to announce their presence.
Owner:SIGNIFY HOLDING BV
Anti-jamming pulse laser frequency division multiplexing optical coding wireless communication system and method
The application discloses an anti-interference pulse laser frequency division multiplexing optical coding wireless communication system and method, provides an optical wireless communication system based on pulse laser, and realizes an anti-interference pulse laser frequency division multiplexing optical coding communication method. Relying on the convergence effect of the light collector, a stable and anti-interference system receiving end is realized, the anti-interference capability of the whole system is realized through a pulse laser source and a multi-channel light splitting module, the utilization rate of the spectrum in the system communication process is improved, and the pulse laser transmission of frequency division multiplexing is realized.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI +1
Correction device and communication device
In optical wireless communication, this technology enables high-speed correction of the communication laser beam. [Solution] The correction device (100) comprises a plurality of driveable mirrors (M101, M102, ...) arranged on the optical path of the communication laser light, a detection unit (120) that detects the communication laser light reflected by the plurality of driveable mirrors, and a drive unit (130) that drives each of the plurality of driveable mirrors according to the detection result of the detection unit, and drives the first driveable mirror and the second driveable mirror among the plurality of driveable mirrors at different timings.
Owner:SOFTBANK CORPORATION
Vehicle Data Unloading System and Method
PendingCN122179002AParticular environment based servicesConnection managementTelecommunicationsWired communication
This invention relates to the field of space optical communication technology, specifically providing a vehicle data unloading system and method, aiming to solve the problem that existing wired communication and traditional wireless communication cannot simultaneously meet the high bandwidth requirements for rapid vehicle data unloading. To this end, the vehicle data unloading system of this invention includes a vehicle-end transmitting device, a fixed-end receiving device, and a supporting component. The vehicle-end transmitting device and the fixed-end receiving device establish a communication link via optical wireless communication signals. The vehicle-end transmitting device is mounted on the vehicle and can directionally transmit optical wireless communication signals carrying vehicle data. The supporting component supports the fixed-end receiving device and drives the fixed-end receiving device towards the transmission direction of the optical wireless communication signals. The fixed-end receiving device is configured to receive the optical wireless communication signals emitted by the vehicle-end transmitting device and controls the supporting component to orient the receiving unit towards the transmission direction of the optical wireless communication signals.
Owner:ZHEJIANG UNIV +1
An optical wireless communication system based on hollow core optical fiber
This application relates to an optical wireless communication system based on hollow-core optical fiber. The central station unit includes a radio frequency (RF) signal generation module, an electro-optic modulation module, and a hollow-core optical fiber adapter transmitter module. The RF signal generation module generates an RF signal; the electro-optic modulation module modulates the RF signal onto an optical carrier to form an optical signal; the hollow-core optical fiber adapter transmitter module couples the optical signal to the hollow-core optical fiber. The remote node unit includes a hollow-core optical fiber adapter receiver module, a photoelectric conversion module, an RF processing front-end module, and an antenna array. The hollow-core optical fiber adapter receiver module couples the optical signal from the hollow-core optical fiber to the photoelectric conversion module; the photoelectric conversion module converts the optical signal into an RF signal; the RF processing front-end module amplifies and filters the RF signal; and the antenna array outputs the RF signal. This application addresses the inherent bottlenecks of traditional optical wireless systems based on solid-core optical fibers in terms of end-to-end delay, transmission bandwidth, and signal nonlinearity impairments.
Owner:WUHAN POST & TELECOMM RES INST CO LTD
Socially aware indoor device cooperation blind spot access method for wireless optical communication
The present application relates to a kind of social awareness indoor equipment cooperation blind spot access wireless optical communication method, belong to optical wireless communication technical field.The method described in the present application is directed to the problem of inter-cell interference in indoor visible light communication, this method uses point coloring method to divide different frequency bands for adjacent visible light access point to suppress inter-cell interference, select multiple interference-free point coloring-based VLC device access for equipment;For the device trapped in the visible light coverage blind spot, design the access method of device cooperation based on social awareness, identify and exclude negative devices for cooperative communication by evaluating the social relationship between devices, select the positive device of D2D cooperative communication to establish relay link between blind spot device.At the same time, in order to improve the online time of cooperative D2D device, power allocation optimization method based on energy efficiency optimization is used.The method can effectively improve the success access rate of device, system throughput and information transmission energy efficiency of relay link between devices.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Flexible backbone network for high-speed optical wireless communication
A backbone network (100) for use in an optical wireless communication system comprises one or more local switches (200) and one or more optical access points (300), APs, wherein local switches (200) are configured to provide to optical APs (300) connections to an external network. Each local switch (200) comprises a first type optical front end (210), OFE, having a rotatable orientation and a beam angle not larger than 60 degrees, and a second type OFE (230) having a 360-degree beam angle on the rotation plane of the first type OFE. Each optical AP comprises an OFE (310) having a rotatable orientation and a beam angle not larger than 60 degrees. The pairing and beam alignment between the first type OFE of a local switch and the OFE of an optical AP is achieved via the assist of the second type OFE of the local switch.
Owner:SIGNIFY HOLDING BV
Energy-autonomous optical wireless communication system
An optical wireless communication receiver (100 / 600) comprising: one or more harvesting solar cells (112) configured to convert light into electrical energy; one or more communication solar cells (122) configured to convert light into electrical signals with information embedded; a rechargeable battery (130) configured to store electrical energy generated by the one or more harvesting solar cells (112); a communication module (150) configured to decode the electrical signals generated by the one or more communication solar cells (122) and extract the information; a first switch (114) configured to connect the one or more harvesting solar cells (112) to the rechargeable battery (130) to achieve a first harvesting state, and to the communication module (150) to achieve a second communication state; a second switch (124) configured to connect the one or more communication solar cells (122) to the communication module (150) to achieve a first communication state, and to the rechargeable battery (130) to achieve a second harvesting state; and a microprocessor (140) configured to control the first switch (114) and the second switch (124).
Owner:KING ABDULLAH UNIV OF SCI & TECH
Wireless optical communication signal differential transmission device and coding and decoding method
This invention discloses a differential transmission device and encoding / decoding method for wireless optical communication signals, relating to the field of wireless optical communication technology. The invention achieves dual-dimensional multiplexing transmission of amplitude and phase by constructing orthogonal amplitude-phase modulated optical wireless communication data frames. The transmitting end uses dual light sources to drive the transmission of optical signals with phase difference, and the receiving end performs differential operations on the two photoelectric signals to suppress common-mode interference such as ambient light, achieving a common-mode rejection ratio of over 60dB. An adaptive phase depth mechanism dynamically adjusts the phase coding accuracy. Under strong ambient light conditions of 10000 lux, the signal-to-noise ratio is improved by 26dB compared to a single-channel solution; the maximum transmission distance is increased by 222% in outdoor scenarios of 5000 lux; and the effective data rate in high-speed digital mode reaches 320kbit / s. It is suitable for both short-distance high-speed indoor communication and long-distance low-interference outdoor transmission, exhibiting strong scenario compatibility.
Owner:NANJING VOCATIONAL UNIV OF IND TECH
Optical wireless communication system with enhanced security
An optical wireless communication system includes a modem configured to communicate with a main network. The system further includes an optical transceiver that includes a controller configured to communicate authentication information with the modem over a cable connection. The optical transceiver is configured to communicate with an end point device using optical signals. The modem is configured to determine, based on the authentication information, whether the optical transceiver is authorized to communicate with the modem and to communicate user data with the optical transceiver over the cable connection at least in response to determining that the optical transceiver is authorized to communicate with the modem.
Owner:SIGNIFY HOLDING BV
Generalized geometric random channel modeling method for indoor optical wireless communications
ActiveCN117061038BFlexible simulationFlexible performance assessmentChannel impulse responseUltraviolet lights
The application discloses a general geometric random channel modeling method for indoor optical wireless communication, and belongs to the field of wireless communication channel modeling. The method comprises the following steps: setting scene layout and frequency band related parameters; generating object reflection cluster birth-death process matrix and random numbers for controlling blocking effect and propagation component classification; initializing scattering clusters and scattering bodies in the clusters; updating and calculating model parameters changing with space and time; calculating light source radiation intensity, object reflection and particle scattering power distribution, and equivalent reflection coefficient; calculating sub-channel impulse response, judging whether the propagation component exists or not, and generating final channel impulse response. The general indoor optical wireless communication geometric random channel modeling method can depict common characteristics of optical wireless frequency bands and unique characteristics of infrared light, visible light and ultraviolet light frequency bands. Through setting corresponding parameters, the established model can support different frequency bands and can be flexibly used for simulation and performance evaluation of a 6G indoor optical wireless communication system.
Owner:SOUTHEAST UNIV +1
Movable mirror device and communication device
To realize a mirror capable of receiving high-energy-density laser light for precise tracking in optical wireless communication. [Solution] The movable mirror device (1) comprises a mirror (1_1) that receives laser light in optical wireless communication, a drive unit (1_2) that drives the mirror (1_1), a substrate (1_3) on which the drive unit (1_2) is mounted, a package (1_5) that contains the mirror (1_1), the drive unit (1_2), and the substrate (1_3) inside, and a cooling element (1_4) that is arranged to conduct heat to the substrate (1_3).
Owner:SOFTBANK CORPORATION
Optical wireless communication terminal and communication link failure resolution method thereof
An optical wireless communication terminal includes an optical wireless transceiver and an integrated controller which monitors an output signal or operation information of the optical wireless transceiver. The integrated controller may monitor an abnormality in a communication link or a relay operation condition based on at least one criterion among a received signal strength and a change in a transmission directional angle, while the optical wireless transceiver transmits or receives optical wireless data to or from a first optical wireless communication terminal, when the abnormality in the communication link or the relay operation condition is detected, the integrated controller may perform a rebooting operation of the optical wireless transceiver, re-establish a communication link with the first optical wireless communication terminal after the rebooting operation, and retransmit or receive again, through the optical wireless transceiver, the optical wireless data whose transmission or reception has been interrupted.
Owner:ELECTRONICS & TELECOMM RES INST
Resource allocation method based on potential game in VLC-wifi heterogeneous network
The present application relates to a kind of resource allocation methods based on potential game in VLC-WiFi heterogeneous network, belong to optical wireless communication technical field.The method described in the present application makes all the VLC access points with overlapping coverage area use different color spectrum, and makes each user access the VLC or WiFi access point with strongest received power;VLC access point and WiFi access point respectively use the resource allocation algorithm based on proportional fair function and equal time resource, calculate the time resource factor of user, and calculate the satisfaction of all users according to time resource factor;Using the access point updating algorithm based on potential game to calculate the potential function value of all users accessing VLC or WiFi, user re-accesses the VLC or WiFi access point with greater potential function value;Calculate the average satisfaction of user in WiFi access point, if the average satisfaction of user is lower than the set threshold, then increase the value of fairness index, and repeat the above resource allocation step.The method described in the present application can improve the throughput of VLC-WiFi heterogeneous network and guarantee the satisfaction of user.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Current density adaptation for an optical wireless communication system
This invention relates to an optical wireless communication system that adapts current density of a light source depending on the link demands. To control current density independently of total current, a light emitting diode (LED) is used that allows adaption of the surface area of the active part of the junction or quantum well through which the current is sent. In an example, the total current is a constant and determined by the allowed power consumption, but nonetheless multiple LEDs are mounted. The current can be adaptively divided among the LEDs, where for short range communication a single LED is used (at high current, high bandwidth, lower efficiency), while for longer-range communication, more LEDs, thus lower current density (thus higher efficiency) are used, or where a selection is done among a fast operating mode with two active LEDs for short distance, a medium operation mode with one active LED with higher current density, and a slow operating mode with one active LED with lower current density for long distance.
Owner:SIGNIFY HOLDING BV
Mobile body, system, computer-readable storage medium, and control method
ActiveCN114423678BArrangements for variable traffic instructionsActuated automaticallyInformation transmissionOptical axis
Provided is a mobile body including: an optical wireless communication unit that performs optical wireless communication with another mobile body; an object detection unit that detects an object in the vicinity of the mobile body; an object information transmission unit that transmits first object information including position information of the object to the other mobile body via optical wireless communication or radio wave communication; an object information reception unit that receives second object information including position information of an object in the vicinity of the other mobile body from the other mobile body via optical wireless communication or radio wave communication; and a movement control unit that controls movement of the mobile body based on the first object information and the second object information so that the object is not located on an optical axis of the optical wireless communication.
Owner:SOFTBANK CORPORATION