Entries |
Document | Title | Date |
20080212970 | NON-LINE OF SIGHT OPTICAL COMMUNICATIONS - A non-line of sight (NLOS) communications system and method are provided. An ensemble of photodetectors is used to collect the light, scattered in the sky being illuminated by initial pulsed laser beam carrying information. Each detector collects scattered light from one area in free space along the initial light propagation line. The same bit of information is detected multiple times on multiple detectors during the pulse transmission along its propagation path. Signals received by multiple detectors are synchronized and processed in a digital signal processing unit. Improved system sensitivity and reliability is achieved by multiple registration of the same bit of information. Special selection of the areas in free space ensures detection of a single bit of information during the time equal to a bit period. | 09-04-2008 |
20080247759 | DEVICES, SYSTEMS AND METHODS FOR AD HOC WIRELESS COMMUNICATION - The current options for wireless communication have changed the way people work and the way in which networks can be deployed. However, there remains unresolved problems in the setup and configuration of wireless communication links. Both known cellular and ad hoc wireless networking protocols and systems are deficient in that the ability for users to communicate without a priori knowledge of MAC addresses (represented by phone numbers, IP addresses and the like) is limited or may be compromised in a hostile environment. In contrast, provided by aspects of the present invention are devices, systems and methods for establishing ad hoc wireless communication between users that do not necessarily have MAC addresses and the like for one another. In some embodiments, a first user visually selects a second user and points a coherent light beam at an electronic device employed by the second user. Data specific to the first user is modulated on the coherent light beam, which can then be demodulated when the coherent light beam is received by the electronic device of the second user. | 10-09-2008 |
20080279558 | METHOD & APPARATUS FOR CLEARING AN OPTICAL CHANNEL - A method and apparatus for clearing an optical channel for transmitting data through free space between a first and second location includes a light beam, wherein the light beam has a spatially and/or time-dependent modulated intensity profile, and is substantially collimated so that the intensity profile is conserved over a specified distance of operation. The light beam includes a cross-sectional profile having regions of low and high intensity, portions of which are provided for the transmission of an optical data signal. A light source wavelength and intensity are selected for types of obscurant particles having optical properties whereby the radiation pressure acts on the particles, and the particles may then be either attracted into or repelled from portions of the spatially modulated optical beam, leaving certain portions of the optical channel beam absent of obscurant particles, thereby enabling transmission of optical data through the cleared optical channel with low attenuation. | 11-13-2008 |
20080279559 | High Frequency Optical Millimeter-Wave Generation and Wavelength Reuse - A method includes generating an optical millimeter wave signal for modulation of a first data signal, and deriving from the generated optical millimeter wave signal a subsequent light source for modulation of a second data signal. More specifically the generating includes modulating a light wave to a multiple of a frequency of an oscillating signal. Alternatively, the generating includes modulating a data signal mixed with an oscillating signal to a multiple of a frequency of the oscillating signal. The deriving includes modulating a frequency component filtered from a data modulation of the generated optical millimeter wave signal. | 11-13-2008 |
20080298809 | Digital Subscriber Line Access Multiplexer, Optical Network Unit, Optical Line Terminal And Base Station - A Digital Subscriber Line Access Multiplexer (DSLAM) includes a Digital Subscriber Line interface unit for processing Physical Layer and Data Link Layer of the Digital Subscriber Line (DSL); at least two virtual DSLAM units adapted to simulate DSLAM to process a packet from the DSL interface unit; and a backhaul interface unit adapted to receive a packet processed by the DSLAM unit, and to send a packet from an access edge node or carrier equipment to the virtual DSLAM unit for processing. The disclosure further provides an Optical Network Unit, an Optical Line Terminal and a Base Station. | 12-04-2008 |
20090022496 | Apparatus and method for arranging communication links in visible light communication - A method and apparatus for arranging communication links in visible light communication increases the user visibility of the system. The method includes the steps of: (a) synchronizing, by a visible light communication (VLC) exchange identification (XID) frame, (b) transmission timing of a primary device and a secondary device in an allocated time slot, and securing time so as to allow the primary device and the secondary device to perform an operation required for transmitting data; (c) transmitting an XID command frame from the primary to the secondary device and (d) transmitting an XID response frame from the secondary receiving the XID command frame to the primary; and (e) filling remaining space of the allocated time slot with a visibility field so as to increase visibility of the remaining space of the allocated time slot after receiving the XID command frame or the XID response frame. | 01-22-2009 |
20090028572 | FREE-SPACE OPTICAL RECEIVING APPARATUS AND ELECTRONIC DEVICE EQUIPPED WITH THAT APPARATUS - A free-space optical receiving apparatus in one embodiment of the invention is provided with: a signal receiving light-sensitive element that converts an infrared signal to an electric current signal; a current-voltage conversion circuit that converts the electric current signal to a voltage signal; a shared processing circuit that amplifies this voltage signal, performs digital conversion on the voltage signal, and outputs a digital signal; and a mode conversion circuit that switches the shared processing circuit to a remote control mode when an infrared signal is received, and switches the shared processing circuit to an IrSimple mode when an IrSimple signal is received. The shared processing circuit converts the remote control signal to a digital signal when in the remote control mode, and converts the IrSimple signal to a digital signal when in the IrSimple mode. | 01-29-2009 |
20090052902 | Communication System, Communication Apparatus and Method, and Computer Program - A communication system ( | 02-26-2009 |
20090074422 | Methods and Apparatus for Target Identification - Methods and apparatus for target identification are disclosed. An example method for target identification disclosed herein comprises establishing an optical communication link with a potential target, transmitting a first signal encoded with a first code to the potential target using the optical communication link, receiving a second signal from the potential target using the optical communication link, extracting a second code from the second signal, and identifying the potential target as a friendly asset based on the second code. | 03-19-2009 |
20090169215 | LIGHTING DEVICE - The invention relates to A method for a lighting device, in particular for a display device such as a LCD-TV, projector etc., generating radiation including at least visible light for illumination with at least one light-emitting element ( | 07-02-2009 |
20090185808 | OPTICAL COMMUNICATION DEVICE AND METHOD OF MANUFACTURING THE SAME - An optical communication device contains a semiconductor chip that performs wireless communication and a wireless-signal-and-optical-signal conversion chip substrate that mounts the semiconductor chip. The semiconductor chip includes a first wireless communication circuit element and a first antenna element. The first wireless communication circuit element is connected to the first antenna element. The wireless-signal-and-optical-signal conversion chip substrate includes a second wireless communication circuit element, a second antenna element and an optical communication element. The second wireless communication circuit element is connected to the second antenna element. The optical communication element is connected to the second wireless communication circuit element. The wireless-signal-and-optical-signal conversion chip substrate mounts the semiconductor chip with the first antenna element of the semiconductor chip and the second antenna element of the wireless-signal-and-optical-signal conversion chip substrate being faced with each other. | 07-23-2009 |
20090196622 | Reconnection method in peripheral interface using visible light communication - A reconnection method and device for a peripheral interface using VLC provide a protocol for when a communication link between a primary device and a secondary device is disconnected. The primary device generates an R-XID message including reconnection information and a warning indication signal indicating the disconnection. The secondary device aligns the communication link with the primary device using the warning indication signal, receives the R-XID message from the primary device by the secondary device, and transmits an R-XID response message for the R-XID message to the primary device. | 08-06-2009 |
20090232509 | ELECTROWETTING RETROREFLECTOR DEVICES, SYSTEMS, AND METHODS - Switchable retroreflector devices that are modulated via electrowetting. The devices include an electrically-conductive polar fluid and a non-polar fluid that is immiscible with the polar fluid. The polar and the non-polar fluids differ in at least one optical property. The fluids are contained in a fluid vessel, or an array of fluid vessels. The fluids are at least partially viewable. A voltage source is configured to selectively apply an electromechanical force to the polar fluid causing repositioning and/or geometrical change of the fluids such that retroreflection in created, or suppressed, by optical refraction or by optical attenuation. | 09-17-2009 |
20100014869 | INTERACTIVE OPTICAL CARDS AND OTHER HAND-HELD DEVICES WITH INCREASED CONNECTIVITY - A system for deriving benefits from the reception and processing of composite video signals by a hand-held device, such as a smart card. Video signals are modulated with auxiliary data creating composite video signals. The composite video signals are then transmitted to and received by a hand-held device. The auxiliary data is then detected in the modulated video signal by circuitry of the hand-held device. The user receives benefits resulting from the reception of the auxiliary data. | 01-21-2010 |
20100034540 | VISIBLE LIGHT TRANSMITTER, VISIBLE LIGHT RECEIVER, VISIBLE LIGHT COMMUNICATION SYSTEM, AND VISIBLE LIGHT COMMUNICATION METHOD - A visible light communication system having a transmission apparatus for modulating a transmission signal to a multiple-value number and a reception apparatus for demodulating a multiple-value modulated transmission signal is provided. The transmission apparatus includes a plurality of light emitters for emitting light in different colors, a chromaticity coordinates calculator for mapping a digital value to a chromaticity coordinates value, and a light intensity controller for controlling a light intensity of each of the light emitters based on the chromaticity coordinates value corresponding to the digital value. The reception apparatus includes a plurality of light receivers having different spectral characteristics, a chromaticity coordinates calculator for calculating a chromaticity coordinates value according to a received light intensity detected by each of the light receivers, and a demodulator for demodulating the digital value from the chromaticity coordinates value. | 02-11-2010 |
20100092180 | HIGH POWER EFFICIENCY OPTICAL-WIRELESS TRANSMITTER - Provided is a high power efficiency optical-wireless transmitter capable of solving problems of low power efficiency, signal distortion due to non-linearity of output, large number of connection terminals, and non-uniformity of optical power intensities of optical sources. The high power efficiency optical wireless transmitter includes: an amplitude-to-array coder converting an amplitude of an electric signal input from a baseband modulator into optical source control signals so as to generate an optical output power corresponding to the electric signal; optical source driver groups driving optical sources based on the optical source control signals of the amplitude-to-array coder; and MMRS (modified mixed radix system) or MMRR (modified mixed radix system with Redundancy) optical source group driven by the optical source driver groups to generate various optical power intensities. | 04-15-2010 |
20100098426 | Electro-Optical Power Level Controller for Free-Space Optical Communication Links - Systems and methods are described for automatically controlling the received power in an optical fiber connected to a free-space optical communications terminal. The system effectively reduces the dynamic range of the received light, enhancing the performance of the communications channel in the face of wide power swings induced by atmospheric scintillation and beam pointing jitter. | 04-22-2010 |
20100172649 | Free-Space Optical Transceiver Using Multimode Fiber to Couple Single Mode Input Optical Signal - An optical circulator couples optical fibers of dissimilar modes. In one embodiment, an optical circulator couples a single mode first fiber to a multimode second fiber, which is used as an optical input to a telescope. The multimode fiber does not significantly degrade the mode structure of the light form the single mode fiber. In the reverse direction, light received by the telescope is coupled into the multimode second fiber, which the circulator couples to a multimode third fiber. | 07-08-2010 |
20100202780 | DIGITAL TRANSMISSION OF DATA IN WHITE LIGHT BY LEDS - A device emits bit sequences (SB | 08-12-2010 |
20100232799 | Transmitter for Transmitting Data in an Optical Data Network and Method for Aligning Such a Transmitter - A device that can be used in an optical data network includes a receiver and a data port. The receiver receives data transmitted wirelessly by means of modulated light from a transmitter. During operation, the receiver is aligned to the transmitter as a function of a signal strength measured by the receiver. The data port can be connected to a computer system. | 09-16-2010 |
20100260503 | Free Space Optical Connector - A Free Space Optics (FSO) connector is provided with a method for interfacing to an electronic circuit card electrical connector via the FSO connector. The method transceives electrical signals via an electronic circuit card electrical connector. Using an FSO connector, the method converts between electrical signals and optical signals, and transceives optical signals via free space. In one aspect, the optical signals are initially received via free space along a first axis, and reflected along a second axis. Further, the optical signals may be initially transmitted along the second axis and reflected into free space along the first axis. In another aspect, the optical signals are transceived in a plurality of directions in free space. For example, optical signals may be transmitted and received in four mutually-orthogonal axes. | 10-14-2010 |
20100303468 | White Light Emitting Device Based on Polariton Laser - A high-efficiency white-light-emitting device that includes a polariton light emitter that emits UV or blue light to a down-converting material that converts the polariton emissions to white light. The polariton light emitter includes an active region situated within a resonant optical cavity formed on a substrate. The down-converting material can comprise a luminophoric phosphor or other material. The polariton light and down-converting material can be arranged in a single apparatus to provide a white-light-emitting device that can be used for lighting and instrumentation. The device can also be configured for high-frequency modulation to provide optical signals for communications and control systems. | 12-02-2010 |
20110002691 | OPTICAL PULSE COMPRESSING BASED ON CHIRPED FIBER BRAGG GRATINGS FOR PULSE AMPLIFICATION AND FIBER LASERS - Techniques and devices for using a chirped fiber Bragg grating to compress amplified laser pulses. | 01-06-2011 |
20110103801 | METHOD FOR PRODUCING TERAHERTZ ELECTROMAGNETIC CARRIER WAVES - A method for producing an electromagnetic carrier wave in the frequency range between 0.1 and 10 terahertz that is suitable for the wireless transmission of data includes generating, by an electromagnetic pump wave, at least two mixing waves with a defined frequency difference, the pump wave being configured to constitute one of the mixing waves; and producing an electromagnetic carrier wave by frequency mixing the mixing waves. | 05-05-2011 |
20110110668 | VISIBLE-LIGHT WIRELESS COMMUNICATION METHOD AND SYSTEM - A visible-light wireless communication system includes a plurality of light transmitters for generating light signals modulated at different frequencies and at least one terminal for wirelessly communicating with the plurality of light transmitters using the light signals. | 05-12-2011 |
20110129228 | Methods and Apparatuses for Enabling Detection of a Modulated Optical Source - Methods and apparatuses for enabling detection of a modulated optical source involve one or more modulated optical signals shifted, i.e., demodulated optically, to one or more base band signals that are detectable by one or more low-frequency detectors. | 06-02-2011 |
20110150489 | Data center with free-space optical communications - A data center for executing a data processing application includes processing units, sub-units or servers. Each of the processing units, sub-units or servers can execute a part or all of the data processing application. The processing units, sub-units or servers are electrical disjoint with respect to data communications, but can communicate with each other over free space optical links. | 06-23-2011 |
20110150490 | Data center with free-space optical communications - A data center for executing a data processing application includes processing units, sub-units or servers. Each of the processing units, sub-units or servers can execute a part or all of the data processing application. The processing units, sub-units or servers are electrical disjoint with respect to data communications, but can communicate with each other over free space optical links. | 06-23-2011 |
20110150491 | Data center with free-space optical communications - A data center for executing a data processing application includes processing units, sub-units or servers. Each of the processing units, sub-units or servers can execute a part or all of the data processing application. The processing units, sub-units or servers are electrical disjoint with respect to data communications, but can communicate with each other over free space optical links. | 06-23-2011 |
20110150492 | Data center with free-space optical communications - A data center for executing a data processing application includes processing units, sub-units or servers. Each of the processing units, sub-units or servers can execute a part or all of the data processing application. The processing units, sub-units or servers are electrical disjoint with respect to data communications, but can communicate with each other over free space optical links. | 06-23-2011 |
20110274434 | Technique for Simultaneously Transmitting Wide and Narrow Optical Beacon Signals - A technique for simultaneously transmitting wide and narrow optical beacon signals includes generating a laser beam and splitting the laser beam into a first signal on a first path and a second signal on a second path via a wavelength-dependent beamsplitter. A wide beacon signal having a first beam divergence is generated from the first signal, and a narrow beacon signal having a second, lesser beam divergence is generated from the second signal. The wavelength of the laser beam determines an allocation of the laser energy between the wide and narrow beacon signals based on transmittance/reflectance characteristic of the beamsplitter at that wavelength. The wide and narrow beacon signals are simultaneously transmitted in a overlaid manner into free space to support acquisition and tracking in a free-space optical communication system. The beamsplitter can simultaneously transmit or reflect substantially all of a data signal at a different wavelength. | 11-10-2011 |
20110286748 | Data Center with free-space optical communications - A data center for executing a data processing application includes processing units, sub-units or servers. Each of the processing units, sub-units or servers can execute a part or all of the data processing application. The processing units, sub-units or servers are electrical disjoint with respect to data communications, but can communicate with each other over free space optical links. | 11-24-2011 |
20120039612 | LOCATING COMPONENTS IN A DATA CENTER - Embodiments of the invention include systems and method for determining the location of components in a data center. In one embodiment, a component locating system includes a lattice formed of interconnected hubs and rods. Each hub in the lattice computes its address relative to the address of a reference location, such as the location of an adjacent hub or of an origin hub defining the origin of a reference coordinate system. A plurality of optical transmitters is distributed along the lattice to transmit location information. Optical receivers mounted on top of the racks receive the location information and communicate the location information to rack-mounted components. The racks and rack-mounted components determine their locations from the location information and optionally transmit the location information to a central management server. | 02-16-2012 |
20120039613 | METHOD AND APPARATUS FOR MULTI-ZONED ILLUMINATION - The present invention is directed to a multi-zoned lighting apparatus. In one embodiment, the multi-zoned lighting apparatus includes at least one circuit board, at least one control circuit coupled to the at least one circuit board and a plurality of light emitting diode (LED) groups coupled to the at least one control circuit, wherein each LED group of the plurality of LED groups is in communication with a respective external sensor that controls a respective one of the plurality of LED groups when triggered. | 02-16-2012 |
20120121271 | Method And Apparatus Of Free-Space Optical Signal Reception Having Enhanced Performance In Scattering Environments - A free space optical receiver is provided that can mitigate the detrimental effects of scattering. In an implementation, the optical beam is imaged onto a detector array in the image plane of the receiver telescope. The detector array has a series of two or more concentric zones for detecting optical power, i.e., for converting optical input to electrical output. The electrical output from each of the detection zones is processed by a respective adaptive equalizer, which is operative for compressing the detected signal pulses to counteract the effect of delay spread and thereby to reduce inter-symbol interference. The outputs from the respective adaptive equalizers are then combined for the purpose of signal recovery. | 05-17-2012 |
20120128365 | APPARATUS AND METHOD FOR PERFORMING COMMUNICATION USING LIGHT WAVELENGTHS IN A VISIBLE LIGHT COMMUNICATION SYSTEM - A transmitting apparatus includes a controller to classify data to be transmitted and to select a corresponding wavelength, a signal modulator to encode the data into an electrical signal, and a light emitting unit to emit a visual light at the selected wavelength based on the electrical signal. A receiving apparatus includes a controller to classify data to be received, and to select a corresponding wavelength, an optical filter to receive and filter a visible light, a visible light receiver to transform the filtered visible light into an electrical signal, and a signal demodulator to demodulate the electrical signal into digital data. A transmission method includes classifying transmission data, selecting corresponding wavelength, and encoding the data into an electrical signal to transmit. A receiving method includes filtering a received light, transforming the filtered light into an electrical signal, and demodulating the transformed electrical signal into digital data. | 05-24-2012 |
20120128366 | APPARATUS AND METHOD FOR PERFORMING COMMUNICATION USING CHROMINANCE INFORMATION IN VISIBLE LIGHT COMMUNICATION SYSTEM - In a transmission apparatus, a reception apparatus and a method for performing communication using chrominance information, a transmission apparatus includes a symbol converter to obtain a symbol from data; a symbol modulator to generate a chrominance value based on the symbol; a luminance controller to generate a luminance value; a color space converter to generate an RGB value based on the luminance value and the coordinate value; and a light emitting unit to emit light based on the RGB value. A reception apparatus includes a visible light receiver to receive light and to generate an electrical signal having RGB color information of the light; a color space converter to generate a luminance value and a chrominance value based on the RGB color information; a symbol demodulator to obtain a symbol based on the chrominance value; and a data converter to convert the symbol to data. | 05-24-2012 |
20120128367 | SERVER DEVICE THAT SETS SECURITY LEVELS IN ACCORDANCE WITH DISTANCES BETWEEN DEVICES, CLIENT DEVICE, COMMUNICATION SYSTEM, INTEGRATED CIRCUIT FOR SERVER CONTROL, INTEGRATED CIRCUIT FOR CLIENT CONTROL, SERVER PROGRAM, CLIENT PROGRAM, METHOD FOR CONNECTING TO A CLIENT DEVICE, METHOD FOR CONNECTING TO A SERVER DEVICE, AND COMMUNICATION SYSTEM CONNECTION METHOD - A server device includes an information management unit, an optical signal transmission unit, and a service provision unit. The information management unit stores and manages a plurality of types of connection information having different importance levels, respectively, in association with the respective importance levels, the connection information being necessary for connection to a service. The optical signal transmission unit modulates the stored plurality of types of connection information into optical signals, such that a type of connection information stored in association with a higher importance level has a smaller amount of change in light intensity, and transmits the optical signals using a first communication function. The service provision unit provides, when the client device has issued a connection request containing a predetermined type of connection information using a second communication function, a service to the client device using the connection information. | 05-24-2012 |
20120195598 | COMMUNICATION SYSTEM - A communications system comprising at least one light source, a side-emitting fiber light rope into which light emitted from the light source is coupled, and means for sending at least one data carrying optical signal along the light rope. | 08-02-2012 |
20120230698 | Wireless network system, wireless device, and network registration medthod of the wireless device - A method of registering a wireless device located in premises in a wireless network which is constructed in the premises. The method includes receiving a light signal, which includes network identification information of the wireless network constructed in the premises from at least one illumination device installed in the premises, and registering the wireless device in the wireless network constructed in the premises, by using the network identification information of the wireless network included in the received light signal. | 09-13-2012 |
20120281987 | Data Detection For Visible Light Communications Using Conventional Camera Sensor - The invention relates to a detection system for determining data embedded into the light output of a light source in a form of a repeating sequence of N symbols. The detection system includes a camera and a processing unit. The camera is configured to acquire a series of images of the scene via specific open/closure patterns of the shutter. The processing unit is configured to process the acquired series of images to determine the repeating sequence of N symbols. By carefully triggering when a shutter of the camera is open to capture the different symbols of the encoded light within each frame time of a camera, a conventional camera with a relatively long frame time may be employed. Therefore, the techniques presented herein are suitable for detecting the invisible “high frequency” coded light while using less expensive cameras as those used in the prior art. | 11-08-2012 |
20120301150 | OPTICAL-INFORMATION ACQUIRING ELEMENT, OPTICAL INFORMATION ACQUIRING ELEMENT ARRAY, AND HYBRID SOLID-STATE IMAGING DEVICE - A optical-information acquisition element encompasses a semiconductor layer ( | 11-29-2012 |
20120321321 | METHODS OF COMMUNICATION UTILIZING AN LED LAMP - Operation of an LED as a light source may be temporarily interrupted to facilitate receipt and/or transmission of optical communications, as well as control of the operation of the LED based thereon. | 12-20-2012 |
20130004181 | Fiber-Optic Automatic Gain Control Systems and Methods - Methods and systems to control a gain applied to a free-space optical (FSO) signal to reduce time-varying intensity fluctuations. An optical pre-amplifier may provide a first, relatively moderate gain with low noise factor (NF). A second optical amplifier may provide a second gain. Amplification may include doped fiber amplification (DFA), such as erbium-doped fiber amplification (EDFA) and/or Raman amplification. A variable optical attenuator (VOA) may be controllable with a relatively fast response time to reduce the time-varying intensity fluctuations. The VOA may effectively control an overall system gain. The gain of the first and/or second optical amplifier may also be controllable to reduce the time-varying intensity fluctuations. Optical intensities may be detected at one or more locations to support one or more feed-forward and/or feedback control loops. A clamp may be applied when an optical power reaches a threshold. | 01-03-2013 |
20130004182 | VISIBLE LIGHT COMMUNICATION APPARATUS CAPABLE OF MINUTE DIMMING CONTROL AND METHOD USING THE SAME - Disclosed herein are a visible light communication method and apparatus. The visible light communication method includes determining a dimming level variable to perform minute dimming control, selecting an upper dimming symbol and a lower dimming symbol, which belong to Variable Pulse Position Modulation (VPPM) symbols, based on the dimming level variable, determining at least one of the number of upper dimming symbols to be sent and the number of lower dimming symbols to be sent based on the dimming level variable, and generating a transmission sequence corresponding to the dimming level variable by combining the upper dimming symbols and the lower dimming symbols based on the number of symbols to be sent. | 01-03-2013 |
20130016978 | METHOD OF VISIBLE LIGHT COMMUNICATION USING ILLUMINANCE SENSOR AND MOBILE COMMUNICATION TERMINAL FOR THE SAMEAANM Son; Jae-SeungAACI Suwon-siAACO KRAAGP Son; Jae-Seung Suwon-si KRAANM Bae; Tae-HanAACI SeoulAACO KRAAGP Bae; Tae-Han Seoul KRAANM Won; Eun-TaeAACI SeoulAACO KRAAGP Won; Eun-Tae Seoul KR - According to one embodiment, a photo detector-combined illuminance sensor includes a circuit for a Photo Detector (PD) function to detect the illuminance of the ambient environment. The illuminance sensor operates under the control of a controller in a visible light communication terminal. When an optical signal detected by the illuminance sensor is a visible light communication signal, the controller switches to cause the illuminance sensor to operate as the photo detector for the visible light communication in a visible light communication mode. | 01-17-2013 |
20130028607 | Method For Optically Transmitting Data Into and From a Casing of a Projectile - A method for optically transmitting data into and from a casing of a projectile. The method including: transmitting, from an outside of the casing to an inside of the casing, a first optical signal containing first data through a first optical window disposed on the casing; manipulating the first data inside the casing of the projectile into second data; and transmitting, from the inside of the casing to the outside of the casing, a second optical signal containing the second data through a second optical window. The first and second optical windows can be the same optical window or different optical windows. | 01-31-2013 |
20130136456 | MOBILE TERMINAL CAPABLE OF LOCALIZATION, LOCALIZATION SERVER AND METHOD FOR LOCALIZING THE MOBILE TERMINAL USING THE LOCALIZATION SERVER - A mobile terminal capable of localization, a localization server, and a method for localizing the mobile terminal using the localization server are disclosed. The disclosed localization server includes a control unit configured to control transmissions of visible-light signals from a multiple number of visible-light transmitting devices; and a position computing unit configured to compute a position of a mobile terminal based on time information regarding when the visible-light signals transmitted respectively from the plurality of visible-light transmitting devices were received at the mobile terminal, where the control unit controls the transmissions such that each of the plurality of visible-light transmitting devices sequentially transmits the visible-light signal for a particular first time period with no overlapping of transmission times of the visible-light signals transmitted respectively from the plurality of visible-light transmitting devices. | 05-30-2013 |
20130195468 | TRANSMITTER, RECEIVER FOR VISIBLE LIGHT COMMUNICATION AND METHOD USING THE SAME - A visible light wireless communication receiver includes: a source code recognizing unit that receives a source bit stream and recognizes the source bit stream as source codes of a unit of a first number of bits; and a line coding unit that encodes each of the source codes into an encoding code of a unit of a second number of bits, the second number being larger than the first number. In particular, in the encoding code, the number of bits corresponding to 1 is the same as the number of bits corresponding to 0. Therefore, the change in brightness of lighting may be minimized in the visible light wireless communication. | 08-01-2013 |
20130251374 | TRANSMITTING AND RECEIVING APPARATUS AND METHOD FOR LIGHT COMMUNICATION, AND THE LIGHT COMMUNICATION SYSTEM THEREOF - According to one exemplary embodiment, a light communication system comprises a transmitting apparatus and a receiving apparatus. The transmitting apparatus generates one or more patterns of light to decide at least one reference area, and transmits signals by emitting light in the at least one reference area decided by the one or more patterns. The receiving apparatus takes measurements fewer than a total amount of pixels over a sensed image to detect the one or more patterns of light, and decides at least one ROI according to one or more detected one or more patterns; then takes all signals of light in the at least one ROI for processing of the light communication, and takes measurements fewer than a total amount of pixels over at least one tracking area for tracking the one or more patterns of light emitted by the transmitting apparatus. | 09-26-2013 |
20130279917 | APPARATUS AND METHOD FOR SUPPORTING MOBILILITY OF A MOBILE TERMINAL THAT PERFORMS VISIBLE LIGHT COMMUNICATION - A method and apparatus for supporting mobility of a mobile terminal in a Visible Light Communication (VLC) system. The method includes activating only necessary light sources for VLC considering the mobility of the mobile terminal, instead of using total light sources for VLC. Consequently, power consumption can be significantly reduced. | 10-24-2013 |
20130287403 | METHODS AND APPARATUS FOR MODULATING LIGHT TO CONCURRENTLY CONVEY HIGH RATE DATA AND LOW RATE DATA - A light transmitter receives a low-rate data signal having a low data rate and a high-rate data signal having a high data rate that is greater than the low data rate. The transmitter includes a light source and a light modulator to modulate the light source based on logic levels of the high-rate data signal and logic levels of the low-rate data signal, to produce modulated light that concurrently conveys the logic levels of the low-rate data signal and the logic levels of the high-rate data signal. | 10-31-2013 |
20130308954 | METHOD AND APPARATUS WITH ERROR CORRECTION FOR DIMMABLE VISIBLE LIGHT COMMUNICATION - An apparatus and method using error correcting for visible light communication are provided. The error correction includes generating an encoded message from an original message by using a predetermined coding method, puncturing the encoded message based on a determined dimming value or rate, and/or puncturing rate, generating a scrambled message by scrambling the punctured message, and providing the scrambled message to a visible light source. | 11-21-2013 |
20130308955 | Coding Scheme And Method For A Colour-Shift-Keying Constellation In A Visible-Light Communication System - A coding scheme for a colour-shift-keying constellation in a visible-light communication system is provided, whereby a minimum number of flipped bits between symbols assigned to neighbouring symbol points in the constellation is aimed. Improved assignments of symbol values to symbol points of the constellation may be provided, which may be capable of reducing a total Hamming distance between all symbol points in the constellation, thereby leading to a reduction of a bit-error ratio. | 11-21-2013 |
20130336660 | LOCALISATION OF ELECTRONIC EQUIPMENT - Localisation of an electronic device is enabled by establishing a localisation environment wherein sources of visible light are configured to modulate onto emitted light a detectable signal, each signal bearing information identifying that light source, such that light incident on a device can be processed to identify particular sources of incident light and therefrom the location of the device. | 12-19-2013 |
20140050486 | Dielectric Resonator Driven Near Field Transducer - An optical device includes a near field transducer; and a dielectric resonant structure coupled to the near field transducer; wherein the dielectric resonant structure comprises a dielectric material that decreases a dissipation of energy in the dielectric resonant structure, relative to other dissipations of energy associated with other materials; and wherein the decrease in the dissipation of energy increases an efficiency of energy transfer from the near field transducer to a target structure, relative to other efficiencies of energy transfer from the near field transducer to the target structure. | 02-20-2014 |
20140056588 | Light module, illumination system and method incorporating data in light emitted - Proposed is a light module ( | 02-27-2014 |
20140072310 | Lighting device and receiver - There is provided a method and corresponding lighting device ( | 03-13-2014 |
20140086590 | SELF-IDENTIFYING ONE-WAY AUTHENTICATION METHOD USING OPTICAL SIGNALS - In one aspect, the present disclosure relates to a self-identifying optical transmitter for broadcasting a one-way authentication code using light-based communication. The transmitter may include a memory for storing an identifier of the transmitter, a processor for generating a data signal including an identifier of the transmitter, a modulator for receiving the data signal and generating an electrical signal, the modular generating the electrical signal by modulating the data signal. The transmitter may also include a light source for receiving the electrical signal, converting the electrical signal into an optical signal, and continuously broadcasting the optical signal as an optical data transmission stream. The optical data transmission stream may be used to verify that a receiving mobile device is near the transmitter. The transmitter may also include an optical surface for dispersing the optical data transmission stream as the optical data transmission stream is emitted from the transmitter. | 03-27-2014 |
20140105607 | METHOD AND APPARATUS FOR DIMMING WITH RATE CONTROL FOR VISIBLE LIGHT COMMUNICATIONS (VLC) - A visible light communication (VLC) device for lighting and data transmission includes a dimming block and a light emitting device. The dimming block is configured to receive a desired brightness level, determine a data duty cycle for the data transmission based on the desired brightness level, determine a filler luminance value based on the desired brightness level, and generate dimming information for use by a second VLC device for decoding the data. The light emitting device is configured to convert the data, the filler luminance value, and the dimming information to visible light for transmission to the second VLC device. | 04-17-2014 |
20140147126 | Method, system and device for transmitting lighting device data - It is presented a method for transmitting lighting device data. The method comprises the steps of obtaining, in a lighting device, a subset of lighting device data, the lighting device data containing information of the lighting device, transmitting, from the lighting device, using light, the subset of lighting device data, and repeating the above steps until all subsets jointly corresponding to the complete lighting device data have been transmitted. A corresponding lighting device and lighting system are also presented. | 05-29-2014 |
20140161465 | SYSTEM AND METHODS FOR OBTAINING UBIQUITOUS NETWORK COVERAGE - Implementations described and claimed herein provide a system and methods for determining a minimum number of communication nodes to substantially cover a particular geographical area and for optimizing an extension of an optical network to provide service to the communication nodes. In one implementation, at least one parameter for one or more forces configured to control interactions of a plurality of nodes is received. Each of the nodes has a node range corresponding to an effective operational limit of the node. Boundary information defining a geographical area to which coverage by a network may be provided is received. The one or more forces are simulated to distribute the plurality of nodes. The simulation of the one or more forces causes the plurality of nodes to become positioned in an overall layout such that the defined geographical area is substantially covered by the node ranges. | 06-12-2014 |
20140186047 | INFORMATION COMMUNICATION METHOD - An information communication method that enables communication between various devices includes: setting an exposure time of an image sensor; obtaining a bright line image including a bright line, by capturing a subject that changes in luminance by the image sensor with the set exposure time; setting a longer exposure time than the exposure time; obtaining a normal captured image by image capture by the image sensor with the longer exposure time; generating a synthetic image by specifying, in the normal captured image, a part that corresponds to the bright line included in the bright line image and superimposing a signal object on the normal captured image, the signal object being an image indicating the part; displaying the synthetic image; and obtaining information by demodulating data specified by a pattern of the bright line included in the obtained bright line image. | 07-03-2014 |
20140186048 | INFORMATION COMMUNICATION METHOD - An information communication method that enables communication between various devices includes: determining a pattern of the change in luminance by modulating the signal to be transmitted; and transmitting the signal by a light emitter changing in luminance according to the determined pattern, wherein the pattern of the change in luminance is a pattern in which one of two different luminance values occurs in each arbitrary position in a predetermined duration, and in the determining, the pattern of the change in luminance is determined so that a luminance change position in the duration is different for each of different signals to be transmitted, the luminance change position being a position at which the luminance rises or a position at which the luminance falls. | 07-03-2014 |
20140186049 | INFORMATION COMMUNICATION METHOD - An information communication method that enables communication between various devices includes: setting an exposure time of an image sensor so that, in an image obtained by capturing a subject by the image sensor, a plurality of bright lines corresponding to a plurality of exposure lines included in the image sensor appear according to a change in luminance of the subject; obtaining a bright line image including the plurality of bright lines, by capturing the subject changing in luminance by the image sensor with the set exposure time; and obtaining information by demodulating data specified by a pattern of the plurality of bright lines included in the obtained bright line image, wherein exposure starts sequentially for the plurality of exposure lines each at a different time, and exposure of each of the plurality of exposure lines starts a predetermined blank time after exposure of its adjacent exposure line ends. | 07-03-2014 |
20140186050 | INFORMATION COMMUNICATION METHOD - An information communication method that enables communication between various devices includes: determining a pattern of a change in luminance, by modulating a first signal to be transmitted; transmitting the first signal, by all of a plurality of light emitting elements included in a light emitter changing in luminance in a same manner according to the determined pattern of the change in luminance; and transmitting a second signal to be transmitted, by each of the plurality of light emitting elements emitting light with one of two different luminance values so that a light and dark sequence of luminance appears in a space where the light emitter is placed. | 07-03-2014 |
20140212145 | INFORMATION COMMUNICATION METHOD - An information communication method is provided that transmits a signal using a change in luminance. The information communication method includes determining a pattern of the change in luminance by modulating the signal to be transmitted, and transmitting the signal by a display, which is a light emitter, changing in luminance according to the determined pattern. Additionally, in the transmitting, a part of the display changes in luminance according to the pattern to display the image, the part emitting light with predetermined brightness or more. | 07-31-2014 |
20140241730 | METHOD AND APPARATUS FOR POWER-EFFICIENT JOINT DIMMING AND VISIBLE LIGHT COMMUNICATION - A method, an apparatus, and a computer program product for communication are provided. The apparatus obtains a message for communication using visible light communication (VLC) through a light emitting diode (LED) luminary device and formats the message using a synchronization signal followed by one or more data signals. The synchronization signal and/or the one or more data signals are modulated using a Frequency Shift Keying (FSK) modulation scheme. The apparatus further receives a dimming level value associated with a brightness of light to be emitted from the LED luminary device, generates a waveform with frequencies based on the formatted message and a duty cycle for the LED luminary device based on the dimming level value, and sends the generated waveform to the LED luminary device for communication using VLC. | 08-28-2014 |
20140255038 | VISIBLE LIGHT COMMUNICATION VIA SOLID STATE LIGHTING DEVICES - A solid-state lighting fixture includes a first group of solid-state light elements, a second group of solid-state light elements, and a light control module. The first group of solid-state light elements is configured to emit visible light at a first wavelength. The second group of solid-state light elements is configured to emit light at a second wavelength, which is different from the first wavelength. The light control module is configured to modulate the light emitted from the first group of solid-state light elements and modulate the light emitted from the second group of solid-state light elements, respectively, such that the modulation pattern of the emitted light from each one of the first group of solid-state light elements and the second group of solid-state light elements communicates a first subset of data and a second subset of data, respectively, while being undetectable to the human eye. | 09-11-2014 |
20140270791 | MULTI-WAVELENGTH VISIBLE LIGHT COMMUNICATIONS SYSTEMS AND METHODS - A system for transmitting data using light includes a plurality of light sources configured to transmit light at non-overlapping wavelengths, processing electronics, and a diffuser configured to diffuse the transmission of light. The processing electronics assign the plurality of light sources to a plurality of channels, accept a data stream, allocate the data stream to the channels, and modulate a transmission of the light using the allocated data stream, where the allocated data used to modulate a first light source of the plurality of light sources is separate from the allocated data used to modulate a second light source of the plurality of light sources. | 09-18-2014 |
20140270792 | Apparatus and Methods of Displaying Messages for Electronic Devices - An apparatus of transmitting messages from an electronic device and display it on a mobile device, and a method of doing the same are disclosed. An exemplifying electronic device has an encoder to encode the data and a drive to modulate the signals into temporal and spatial light patterns according to the transmitted message. The light signals are then emitted from a group of LEDs on the electronic device. A video camera on a mobile device captures the light signals in the form of temporal and spatial patterns. A software application decodes the message and displays the message on the mobile device screen. | 09-18-2014 |
20140270793 | OPTICAL COMMUNICATION FOR SOLID-STATE LIGHT SOURCES - The disclosure relates to a lighting fixture, which includes an array of solid-state light sources that are configured to generate light for general illumination lighting purposes and control circuitry. A drive signal is used to drive solid-state light sources. The control circuitry is configured to use a control output to control the drive signal to at least one of the solid-state light sources. The control output is configured to control the drive signal to 1) set at least one characteristic of the light generated by the array of the solid-state light sources, and 2) modulate the light with data for transmission. The light is modulated such that any change in the at least one characteristic based on the light being modulated is anthropically imperceptible. The characteristic of the light generated by the array of solid-state light sources may include the intensity, color, color temperature and the like. | 09-18-2014 |
20140270794 | METHODS AND SYSTEMS FOR ENCODING AND DECODING VISIBLE LIGHT WITH DATA AND ILLUMINATION CAPABILITY - A lighting system includes light fixtures not in communications with and not synchronized with one another, and one or more light sensors. Each light fixture separately emits data encoded visible light including light fixture information encoded therein in a manner that avoids visually perceptible flicker and enables light fixture information emitted by one light fixture to be distinguished from light fixture information emitted by other light fixtures. The light fixture information is encoded into data encoded visible light such that a difference between different levels of the data encoded visible light is indicative of an illumination capability of the light fixture and such that visually perceptible flicker is avoided. Each light sensor separately receives portions of data encoded light visible light emitted by multiple light fixtures and separately determines the identity of and the maximum and present illumination contributions for each light fixture. | 09-18-2014 |
20140286644 | INFORMATION COMMUNICATION METHOD - An information communication method that enables communication between various devices is an information communication method of transmitting a signal using a change in luminance, and includes: determining a pattern of the change in luminance, by modulating the signal to be transmitted; and transmitting the signal, by a plurality of light emitters changing in luminance according to the determined pattern of the change in luminance, wherein the plurality of light emitters are arranged on a surface so that a non-luminance change area does not extend across the surface between the plurality of light emitters along at least one of a horizontal direction and a vertical direction of the surface, the non-luminance change area being an area in the surface outside the plurality of light emitters and not changing in luminance. | 09-25-2014 |
20140286645 | LIGHTING FIXTURE AND VISIBLE-LIGHT-COMMUNICATION SYSTEM WITH SAME - A lighting fixture is configured to modulate light intensity of a light source ( | 09-25-2014 |
20140294396 | SIGNAL RECEIVING STRUCTURE AND ELECTRONIC DEVICE HAVING THE SAME - A signal receiving structure and an electronic device having the same are disclosed. The signal receiving structure used for the electronic device to receive an infrared signal includes a signal receiving area, a first block, a second block, and a third block. The signal receiving area is used to receive the infrared signal. The first block is connected to the signal receiving area and the infrared signal is transmitted therethrough. The second block is connected to the first block. A specific angle is interposed between the first block and the second block, such that the infrared signal can be transmitted through the second block by total reflection. The third block is connected to the second block and has a signal output area for the infrared signal to emit by the signal output area after total reflection. The signal receiving area is smaller than the signal output area. | 10-02-2014 |
20140294397 | INFORMATION COMMUNICATION METHOD - An information communication device which transmits a signal using a change in luminance includes a determiner that determines a pattern of the change in luminance by modulating a signal to be transmitted and a transmitter that transmits the signal by causing a display to change luminance according to the determined pattern. When the display is adjacent to an other display and each of the display and the other display transmit a signal by changing luminance, the transmitter is configured to cause the display to change luminance in an area of the display other than a non-transmission area that is near the other display, without causing the display to change luminance in the non-transmission area. | 10-02-2014 |
20140294398 | INFORMATION COMMUNICATION METHOD - An information communication device includes an exposure time setter that sets an exposure time of an image sensor so that a bright line corresponding to an exposure line included in the image sensor appears according to a change in luminance of the light emitter. A first information obtainer obtains first information by demodulating data specified by a pattern of the bright line included in the obtained bright line image and a second information obtainer obtains second information by capturing a plurality of light emitting elements, each of which emits light with one of two different luminance values, and demodulating data specified by a light and dark sequence of luminance along a direction substantially parallel to the exposure line. | 10-02-2014 |
20140301737 | Methods and Devices for Transmitting/Obtaining Information by Visible Light Signal - The present invention discloses methods and devices for transmitting/obtaining information by visible light signal. The method for transmitting information by visible light signal from a light source comprising: modulating, on the basis of the information to be transmitted, a driving signal of the light source to obtain a modulated driving signal for driving the light source to emit visible light signal having its level changed between a peak level and a bottom level with varied frequencies at different time points; and emitting the visible light signal having its level changed between a peak level and a bottom level with varied frequencies at different time points on the basis of the modulated driving signal, so as to transmit information corresponding to the varied numbers of bright or dark stripes shown in one or more images obtained from the visible light signal at one or more time points, which numbers are corresponding to the varied frequencies. | 10-09-2014 |
20140321859 | Methods and Devices for Transmitting /Obtaining Information by Visible Light Signals - The present invention discloses methods and devices for transmitting/obtaining information by visible light signals. The method for transmitting information by visible light signals of two or more wavelengths from light sources comprises: modulating, on the basis of the information to be transmitted, two or more driving signals of the light sources to obtain two or more modulated driving signals for driving the light sources to emit the visible light signals of two or more wavelengths having their levels changed between peak levels and bottom levels with different frequencies and/or different phases and/or different amplitudes; and emitting the visible light signals of two or more wavelengths having their levels changed between peak levels and bottom levels with different frequencies and/or different phases and/or different amplitudes on the basis of the two or more modulated driving signals, so as to transmit information corresponding to a pattern of color stripes shown in an image obtained from the visible light signals. | 10-30-2014 |
20140321860 | LIGHTING APPARATUS FOR VISIBLE LIGHT COMMUNICATION, AND VISIBLE LIGHT COMMUNICATION SYSTEM USING THE APPARATUS - A lighting apparatus for visible light communication includes at least one luminaire body and a visible-light-communication-signal-outputting part. The luminaire body includes a light source that includes an LED. The visible-light-communication-signal-outputting part is configured to output a modulation signal to the luminaire body. The luminaire body further includes: a power supply circuit configured to dim the light source; a switch element for modulating an output current that is supplied from the power supply circuit to the light source; a resistor connected in parallel with the switch element; and a photo-coupler configured to receive the modulation signal output from the visible-light-communication-signal-outputting part. The visible-light-communication-signal-outputting part is provided outside the luminaire body, and is configured to transmit the modulation signal via the photo-coupler. | 10-30-2014 |
20140328597 | TRACKABLE WIRELESS OPTICAL COMMUNICATION - Embodiments provide a first communications device configured to communicate with one or more other communications devices over a wireless optical link. The first communications device may include a first communications structure configured to communicate with a second communications structure via the wireless optical link. The communications device may further include a micro-electro-mechanical systems (MEMS) mirror configured to direct an optical data signal sent over the wireless optical link and a controller configured to move the MEMS mirror based on feedback information to maintain the optical link between the first communications structure and the second communications structure. | 11-06-2014 |
20140328598 | INFRARED RECEPTION CIRCUIT AND INFRARED RECEPTION METHOD - An infrared reception circuit and an infrared reception method are provided. The infrared reception circuit includes an infrared receiver for receiving infrared signals and converting the infrared signals into analog signals, an amplifier for amplifying the analog signals, an analog/digital converter for converting the amplified analog signals into digital signals, a digital filter for filtering the digital signals via respective frequency bands, a digital frequency-adjusting demodulator for demodulating the filtered digital signals into digital audio frequency signals, and a digital/analog converter for converting the digital audio frequency signals into analog audio signals. Compared with the prior art, the infrared reception circuit and the infrared reception method require far less elements that are used for receiving infrared signals and can still achieve optimal reception, thereby simplifying processes of manufacture and increasing throughput and good yield as a result. | 11-06-2014 |
20140328599 | Network Security and Variable Pulse Wave Form with Continuous Communication - A pulsed light communication device has a plurality of indicator light emitting diodes emitting diodes emitting at least one of a plurality of wavelengths of colored light to correspond to a designated color assigned to a security level for a network. A continuous uninterrupted modulated pulsed light emitting diode light signal may be generated having a sensitivity threshold detection level exceeding minimal parameters of a photodetector. | 11-06-2014 |
20140348510 | DATA CENTER WITH FREE-SPACE OPTICAL COMMUNICATIONS - A data center for executing a data processing application includes processing units, sub-units or servers. Each of the processing units, sub-units or servers can execute a part or all of the data processing application. The processing units, sub-units or servers are electrical disjoint with respect to data communications, but can communicate with each other over free space optical links. | 11-27-2014 |
20140376922 | INFORMATION COMMUNICATION METHOD - An information communication method that obtains information from a subject includes setting an exposure time of an image sensor that, in an image obtained, a bright line corresponding to each of a plurality of exposure lines included in the image sensor appears, according to a change in luminance of the subject. A bright line image, in which the bright line is shown along with surroundings of the subject, is obtained by starting exposure of each of the exposure lines included in the image sensor at a sequentially different time. The bright line image is displayed and information is obtained when, in the bright line image, a part corresponding to the bright line is tapped, by demodulating data specified by a direction generally perpendicular to the exposure line in a pattern of the bright line corresponding to the tapped part. | 12-25-2014 |
20150016824 | APPARATUS, SYSTEM AND METHOD OF COMMUNICATING POSITIONING TRANSMISSIONS - Some demonstrative embodiments include apparatuses, systems and/or methods of communicating positioning transmissions. For example, an apparatus may include a controller to control at least one light transmitter to transmit from a mobile object Intensity-Modulated (IM) optical signals including On-Off-Keying (OOK) signals of one or more positioning transmissions, the controller is to control the at least one light transmitter to transmit from the mobile object one or more first OOK signals over a first ranging frequency, and to transmit from the mobile object one or more second OOK signals over a second ranging frequency, the second ranging frequency is different from the first ranging frequency. | 01-15-2015 |
20150016825 | VISIBLE LIGHT COMMUNICATION DEVICE, LIGHTING FIXTURE INCLUDING THE SAME, AND LIGHTING SYSTEM - The visible light communication device includes a control circuit configured to repeat a transmission process of transmitting a communication signal through modulating an intensity of visible light to be emitted from a light source. The control circuit is configured to, in the transmission process, arbitrarily select a time slot for transmission from a plurality of time slots set within a predetermined time period allocated to the transmission process, and transmit the communication signal in the time slot for transmission. | 01-15-2015 |
20150023669 | TECHNIQUES FOR LOW POWER VISUAL LIGHT COMMUNICATION - Various embodiments are generally directed to techniques for reducing the consumption of electric power in decoding VLC frame patterns by selectively decoding data patterns based on an analysis of marker patterns. A device to receive data in visual light communications includes a processor component; and a decoding component for execution by the processor component to analyze a marker pattern of a frame pattern in a captured image to determine whether the frame pattern is a useful frame pattern, and to selectively decode a data pattern of the frame pattern to retrieve a packet of data based on the analysis. Other embodiments are described and claimed. | 01-22-2015 |
20150030335 | APPARATUS FOR RECEIVING AND TRANSMITTING OPTICAL INFORMATION - An apparatus for transmitting information using a visible light includes at least three light emitting devices, each being installed based on a predetermined interval and direction, and a data transmitting unit to transmit data by controlling the at least three light emitting devices. | 01-29-2015 |
20150037042 | RECEIVER CHIP AND METHOD FOR ON-CHIP MULTI-NODE VISIBLE LIGHT COMMUNICATION - A receiver chip, system and method for on-chip multi-node visible light communication, the receiver chip comprising: an array of receiver cells comprising an array of photodetectors, each receiver cell comprises at least one photodetector and is to receive light through the at least one photodetector, and a logical layer for independently configuring at least one selected receiver cell as a communication receiving channel. The system comprises an array of receiver cells comprising an array of photodetectors, each receiver cell includes at least one photodetector and is to receive light through the at least one photodetector, a logical layer to independently configure at least one selected receiver cell as a communication receiving channel, and a processor to receive data from the logical layer and control the logical layer for configuration of the receiver cells. | 02-05-2015 |
20150043924 | MOBILE TERMINAL CAPABLE OF LOCALIZATION, LOCALIZATION SERVER AND METHOD FOR LOCALIZING THE MOBILE TERMINAL USING THE LOCALIZATION SERVER - A mobile terminal capable of localization, a localization server, and a method for localizing the mobile terminal using the localization server are disclosed. The disclosed localization server includes a control unit configured to control transmissions of visible-light signals from a multiple number of visible-light transmitting devices; and a position computing unit configured to compute a position of a mobile terminal based on time information regarding when the visible-light signals transmitted respectively from the plurality of visible-light transmitting devices were received at the mobile terminal, where the control unit controls the transmissions such that each of the plurality of visible-light transmitting devices sequentially transmits the visible-light signal for a particular first time period with no overlapping of transmission times of the visible-light signals transmitted respectively from the plurality of visible-light transmitting devices. | 02-12-2015 |
20150071644 | Protocols for visible light communications - The invention relates to the field of IEEE 802.15.4 based networks, and in particular to methods and devices for transmitting and receiving messages in IEEE 802.15.4 based networks. The existing IEEE 802.15.4 standard is further improved and adapted to better fit the properties of a network of lighting devices. The improvements and adaptations of the existing IEEE 802.15.4 standard allow for more flexible addressing. Bits which are indicative of use of address fields and/or whether one or two frame control fields is/are present in the ordered data portions of the message to be transmitted are defined by the device transmitting the message in the IEEE 802.15.4 based network. Existing features of the existing IEEE 802.15.4 standard protocol are retained. | 03-12-2015 |
20150078757 | VISIBLE LIGHT TRANSCEIVER GLASSES - An LED light and communication system includes Visible Light Communication Transceiver Glasses having at least one projector, lense(s), and optical transceiver, the optical transceiver including a light support and a processor. The light support has at least one light emitting diode and at least one photodetector attached. The processor is in communication with the at least one light emitting diode and the at least one photodetector. The processor is capable of illuminating the at least one light emitting diode to create at least one light signal which is not observable to the unaided eyes of an individual. The second light signal includes at least one data packet. The processor may generate a signal for the projector to display information on the lense(s). | 03-19-2015 |
20150098708 | VISIBLE LIGHT COMMUNICATION APPARATUS - A visible light communication apparatus includes a constant current circuit and a load circuit including light emitting elements connected to output terminals of the constant current circuit. Further, the visible light communication apparatus includes a load variation circuit configured to change load characteristics of the load circuit by electrically connecting to the load circuit, the load variation circuit including a series circuit of a diode and a resistor connected in series to the load circuit and a switching element configured to electrically connect or disconnect the load variation circuit to the load circuit in response to a binary communication signal. | 04-09-2015 |
20150098709 | TECHNIQUES FOR EMITTING POSITION INFORMATION FROM LUMINAIRES - Techniques are disclosed for emitting position information from luminaires. Luminaire position information may be emitted via a light-based communication (LCom) signal that comprises data including the position information. The data may include relative and/or absolute position information for the luminaire and may indicate the physical location of the luminaire. Relative position information for the luminaire may include coordinates relative to a point of origin within the environment. Absolute position information for the luminaire may include global coordinates for the luminaire. In some cases, the absolute position information for a luminaire may be calculated using position information for the luminaire relative to a point of origin and the absolute position of the point of origin. The data may also include an environment identifier, which may indicate a map to use for the interpretation of position information for the luminaire. The techniques can be used for both stationary and mobile luminaires. | 04-09-2015 |
20150117864 | SYSTEMS AND METHODS FOR TRANSMITTING ROUTABLE OPTICAL ENERGY PACKETS - A system for transmitting routable energy packets includes an optical power source and a processing circuit. The optical power source is configured to generate an optical power packet having optical energy, generate an optical data packet comprising routing information configured to control a route of the optical power packet, and transmit the optical power packet and the optical data packet via a conduit. The processing circuit is configured to generate the routing information to be transmitted within the optical data packet, and control a transmission by the optical power source. | 04-30-2015 |
20150125156 | ONU WITH WIRELESS CONNECTIVITY CAPABILITY - The embodiments herein relate to a method in an optical network unit, referred to as an ONU, for providing wireless connectivity capability to the ONU. The ONU is comprised in a communications network. The ONU is interconnected to an optical line terminal, referred to as an OLT, via a wireline communications link and a wireless communications link. The ONU is configured to support a sleep mode. The ONU obtains information about entry into the sleep mode. The ONU identifies whether the wireless communications link is activated or deactivated, and activates the wireless communications link if the wireless communications link is identified as deactivated. The ONU enters sleep mode, and provides wireless connectivity capability to the ONU by means of the wireless communications link during the sleep mode. | 05-07-2015 |
20150132006 | LED-LAMP, POWER-LINE NETWORK SYSTEM, WRITING METHOD FOR LOCATION INFORMATION, PROJECTOR, DATA PROCESSING METHOD AND COLLISION AVOIDANCE SYSTEM - An LED lamp acquires its location information from the outside through its power-line communication section and stores the acquired location information in nonvolatile storage device. A communication control section, which establishes visible light communication, uses visible light to transmit, at a predetermined timing, the location information read from a location information storage area in the nonvolatile storage device. An employed writing method for location information includes the steps of causing a server device coupled to a power-line network to provide a database in which the ID the LED lamp is associated with the location information, causing the server device to receive a location information write request transmitted from the LED lamp, searching the database to retrieve the location information associated with the requesting LED lamp, transmitting the retrieved location information to the power-line network, and causing the requesting LED lamp to write the location information into the nonvolatile storage method. | 05-14-2015 |
20150139659 | INFORMATION COMMUNICATION DEVICE - An information communication method includes: determining whether conflict over use of a light receiving unit will occur between a first program for performing visible light communication and a second program for performing processing different from the visible light communication; notifying a user that the conflict will occur if it is determined that the conflict will occur; permitting one of the first program and the second program to use the light receiving unit in response to an operation by the user; and causing, by the first program, a computer to execute visible light communication according to light detected by the light receiving unit if the first program is permitted to use the light receiving unit. | 05-21-2015 |
20150139660 | METHOD OF VISIBLE LIGHT COMMUNICATION USING ILLUMINANCE SENSOR AND MOBILE COMMUNICATION TERMINAL FOR THE SAME - According to one embodiment, a photo detector-combined illuminance sensor includes a circuit for a Photo Detector (PD) function to detect the illuminance of the ambient environment. The illuminance sensor operates under the control of a controller in a visible light communication terminal. When an optical signal detected by the illuminance sensor is a visible light communication signal, the controller switches to cause the illuminance sensor to operate as the photo detector for the visible light communication in a visible light communication mode. | 05-21-2015 |
20150147067 | SYSTEM AND METHOD FOR COMMUNICATION WITH A MOBILE DEVICE VIA A POSITIONING SYSTEM INCLUDING RF COMMUNICATION DEVICES AND MODULATED BEACON LIGHT SOURCES - A light source emits a modulated light, and a radio-frequency transceiver disposed therewith emits a radio-frequency signal. A mobile device may receive either or both signals and determine its position based thereon. The light and radio-frequency sources may be disposed in node in a network of said sources, and the nodes may communicate via the radio-frequency transceivers. | 05-28-2015 |
20150295645 | VISIBLE LIGHT COMMUNICATION TERMINAL - A housing body of a visible light communication terminal houses a light receiving unit configured to receive a visible light communication signal to convert the received visible signal to an electrical signal, an output unit configured to output information obtained from the visible light communication signal, and a power supply unit configured to supply power to the light receiving unit and the output unit. An ear hooking part is curved in an arc-like shape and is attached at one end thereof to the housing body, and is configured to fit the housing body to an auricle by being hooked onto the auricle and together with the housing body sandwiching the auricle therebetween. The light receiving unit is located on a portion of the housing body on an upper side thereof in a vertical direction in a state where the housing body is fitted to the auricle. | 10-15-2015 |
20150296587 | WAVELENGTH SENSING LIGHTING SYSTEM AND ASSOCIATED METHODS - A wavelength sensing lighting system that may comprise a light source included in an array to emit illuminating light, the array including a plurality of light sources, a sensor included in the array configured to sense environmental light from an environment, and a controller operatively connected to each of the sensor and the light source and may be configured to analyze the environmental light sensed by the sensor to at least one of detect and generate data relating to a condition of the environment, the data being transmittable in a data light. The controller may be configured to receive the data included in the data light using the sensor. The controller may be configured to analyze the data and to control the transmission of the data light from the light source. The controller may be configured to operate the array to emit an alert upon sensing an event. | 10-15-2015 |
20150301321 | Modified Schmidt-Cassegrain Telescope For Use In A Free-Space Optical Communications System - A Cassegrain telescope uses a pivoted corrector plate to reduce back-reflections. A converging lens is added to the optical path inside a housing of the telescope to focus the light within the telescope. The modified Cassegrain design may be used a hybrid radio frequency and free-space optical commercial communications network. | 10-22-2015 |
20150304028 | Signal Transmission Method and Apparatus - Provided are a signal transmission method and apparatus. In the signal transmission method, a terminal device obtains a signal to be sent; and the terminal device sends the signal through a visible light medium, wherein after being demodulated, the signal sent through the visible light medium is carried on a power line for transmission. By virtue of the solution, the problem in related technologies regarding the integration of the visible light communication as a wireless access manner with the power line communication technology is solved, the construction of the communication network can be more convenient and faster, and the advantages of the visible light communication and the power line communication technology are fully utilized. | 10-22-2015 |
20150304029 | VISIBLE LIGHT COMMUNICATION SYSTEM - A controller is configured, by decreasing light quantity in only a first slot that is any one of a plurality of slots into which a unit time is divided equally, and increasing light quantity in all the remaining slots except the first slot of the plurality of slots, to assign information to the first slot of the plurality of slots. The controller is furthermore configured to decrease light quantity in second slots that are three or more continuous slots starting from a head of a preamble, which indicates a frame start point, of a frame of an optical-communication signal and to increase light quantity in a slot immediately before the preamble. | 10-22-2015 |
20150304030 | VISIBLE LIGHT COMMUNICATION METHOD - A visible light communication method. Firstly, a plurality of binary logic streams is sequentially received and a serial-to-parallel conversion is performed on them to obtain a plurality of binary signal sets corresponding to each binary logic stream. Then, all the binary signal sets are respectively mapped to obtain the first OFDM symbols in frequency domain. The first OFDM symbols are respectively transformed into the second OFDM symbols in time domain. Then, a parallel-to-serial conversion is performed on the second OFDM symbols. Adequate cyclic prefix is added in each of the second OFDM symbols. Next, the relative intensity of each of the second OFDM symbols is regulated, and then a digital-to-analog conversion is performed on the second OFDM symbols to obtain analog electrical signals. Finally, visible lights respectively corresponding to the analog electrical signals are generated. | 10-22-2015 |
20150304031 | VISIBLE LIGHT COMMUNICATION SYSTEM, SYSTEM DATA MODULATION METHOD THEREFOR, AND PERFORMANCE INFORMATION FEEDBACK METHOD - A visible light communication system, and a method of modulating data and a method of feeding back performance information in the system, are provided. | 10-22-2015 |
20150304032 | MULTI-WAVELENGTH VISIBLE LIGHT COMMUNICATIONS SYSTEMS AND METHODS - A system for transmitting data using light includes a plurality of light sources configured to transmit light at non-overlapping wavelengths, processing electronics, and a diffuser configured to diffuse the transmission of light. The processing electronics assign the plurality of light sources to a plurality of channels, accept a data stream, allocate the data stream to the channels, and modulate a transmission of the light using the allocated data stream, where the allocated data used to modulate a first light source of the plurality of light sources is separate from the allocated data used to modulate a second light source of the plurality of light sources. | 10-22-2015 |
20150341113 | LIGHTING AND DATA COMMUNICATION SYSTEM USING A REMOTELY LOCATED LIGHTING ARRAY - A lighting system for transmitting light to a plurality of specific locations is disclosed. The lighting system includes at least one source lighting array and a plastic optical fiber (POF). The source lighting array comprises a plurality of lighting elements. The plurality of lighting elements are each configured to generate visible light. The POF cable has an end in communication with the source lighting array. The POF cable transmits visible light generated by the source lighting array to the plurality of specific locations. | 11-26-2015 |
20150349883 | LIGHT BASED LOCATION SYSTEM - Aspects of the disclosure relate to a light source based location and operation system. A computing device may detect an encoded light signal containing an identifier from a light source at a location. The encoded light signal can be decoded to obtain the identifier, and a request for information based on the identifier can be transmitted in response to decoding the identifier. Information associated with the identifier may be received in response to the request for information including location information corresponding to the location of the light source. The location information may be used to provide additional information to the user or enable a user to control devices based on the location information. | 12-03-2015 |
20150349884 | Optimizing the rate in a Li-Fi system - The invention relates to a method for optimizing the data rate, in a wireless communication system comprising a LED forming an emitting device, and a photodetector forming a receiving device. For a given value of a DC component of the supply signal of the LED, the modulation amplitude of an AC component of this supply signal is adjusted step by step, so as to improve the transmission quality of the signal provided by the LED and received by the photodetector. The invention also relates to an optimization module implementing such a method. Alternatively, the modulation amplitude of the AC component of the supply signal is set, and the value of the DC component is adjusted step by step. | 12-03-2015 |
20150358079 | VISIBLE LIGHT COMMUNICATION IN A MOBILE ELECTRONIC DEVICE - Systems and methods for visible light communications (VLC) are provided. As such, VLC may be configured and used in a mobile electronic device. In certain instances, the location of a mobile electronic device may be used to identify a communication protocol and visible light communications light source that transmits VLC communications at that location. A user device may receive information from a radio network that enables the mobile device to receive and decode communications transmitted using light at various geo-locations. | 12-10-2015 |
20150358085 | OPTICAL COMMUNICATION CIRCUITS - Various apparatuses, circuits, systems, and methods for optical communication are disclosed. In some implementations an optical transmitter includes an optical data port configured to engage an optical fiber. The optical transmitter also includes a plurality of lasers coupled to the optical data port and configured and arranged to transmit respective optical signals over the optical fiber via the optical data port when selected. A control circuit of the optical transmitter is configured to receive an input data signal and encode the input data signal for transmission over the optical fiber by selecting one or more of the plurality of lasers at a time. The control circuit is configured to select one or more of the plurality of lasers at a time according to one of a frequency modulation encoding algorithm or an amplitude modulation encoding algorithm. | 12-10-2015 |
20150365166 | OPTICAL COMMUNICATION FOR BODY MOUNTABLE DEVICES - A system includes one or more optical emitters, a transceiver, and a body mountable device. The optical emitters emit light and are configured to be used in luminaires. The transceiver is coupled to receive input data from a data network and coupled to selectively modulate the optical emitters to transmit the optical data. Selectively modulating the optical emitters is in response to the input data. The body mountable device includes a photodetector coupled to receive the optical data and processing circuitry configured to initiate an action in response to receiving the optical data from the photodetector. | 12-17-2015 |
20150372760 | OPTICAL TRANSCEIVER - An optical transceiver is configured to use, as an electric signal, a digital modulation signal having a predetermined bit rate. The optical transceiver includes a case having a space for storing a component therein and a resistor being arranged between upper and lower surfaces of the space and having conductance of from 1 S/m to 1,000 S/m. The space has a height equal to or less than a wavelength in a free space of an electromagnetic wave of a frequency corresponding to the predetermined bit rate. At least a part of the height of the space is larger than a half of the wavelength. The height of the space is smaller than a width of the space. The width of the space is smaller than a depth of the space. | 12-24-2015 |
20150372767 | OPTICAL RECEIVER - A filter is supplied with a waveform signal generated based on an output from the light receiving element. At a subsequent stage of the filter, a voltage generation circuit and a variable gain amplifier are provided. The voltage generation circuit generates a reference voltage to regulate a bias voltage for an output waveform. The variable gain amplifier amplifies a filter output waveform using a variable gain. The control circuit controls a reference voltage based on an output from the variable gain amplifier and performs automatic gain control for the variable gain amplifier. The control circuit boosts a bias voltage for a filter output waveform based on the reference voltage according to an unnecessarily dull output waveform from the variable gain amplifier. In addition, the control circuit performs control so that a gain of the variable gain amplifier is smaller than a present gain. | 12-24-2015 |
20160020854 | System to enable communication, sometimes called Li-Fi or Visible Light Communication ( V.L.C. ) between computers or broadcast programs and simple microcontroller gadgets with limited user interfaces, to further the "internet of things" - A simple system to enable communication between computers, or mobile computers, or computer driven television displays, or broadcast programs and microcontroller gadgets with limited user interfaces. | 01-21-2016 |
20160028477 | DERIVATION OF AN IDENTIFIER ENCODED IN A VISIBLE LIGHT COMMUNICATION SIGNAL - Methods, systems, and devices are described for deriving an identifier encoded in a visible light communication (VLC) signal. One method includes capturing a first part of the VLC signal; extracting, from the first part of the VLC signal, a first pattern of bits representing at least a portion of the identifier encoded in the VLC signal; comparing the first pattern of bits to different portions of a plurality of identifiers; and identifying, based at least in part on the comparing, a subset of the plurality of identifiers as candidate matches to the identifier encoded in the VLC signal. | 01-28-2016 |
20160028478 | COMMUNICATION SYSTEM, LIGHTING SYSTEM AND METHOD OF TRANSMITTING INFORMATION - The invention provides a communication system ( | 01-28-2016 |
20160037293 | LIGHT FIXTURE COMMISSIONING USING ENCODED LIGHT SIGNALS - Methods, systems, and devices are described for commissioning light fixtures. One method may include receiving, at a mobile device, an encoded light signal from a light fixture in a plurality of light fixtures. The encoded light signal may be decoded to obtain an identifier associated with the light fixture, and a correspondence between the identifier and a plurality of locations of the plurality of light fixtures may be determined. | 02-04-2016 |
20160047890 | SYSTEM AND METHOD FOR ESTIMATING THE POSITION AND ORIENTATION OF A MOBILE COMMUNICATIONS DEVICE IN A BEACON-BASED POSITIONING SYSTEM - An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device. | 02-18-2016 |
20160050700 | FIRST ELECTRONIC APPARATUS CAPABLE OF ACTIVELY PAIRING WITH SECOND ELECTRONIC APPARATUS FOR WIRELESS COMMUNICATION AND CORRESPONDING METHOD - A first electronic apparatus capable of pairing with a second electronic apparatus for wireless communication includes a light sensor and a processing circuit. The light sensor is used for detecting light emitted by the second electronic apparatus. The processing circuit is coupled the light sensor and used for decoding the detected light to generate decoded pairing data. The first and second electronic apparatuses pair successfully according to the decoded pairing data. The light carrying the pairing data is generated by the second electronic apparatus based on at least one of brightness variation(s), color variation(s), and pattern variation(s). | 02-18-2016 |
20160065306 | SYSTEM AND METHOD FOR GREEN COMMUNICATION FOR INTELLIGENT MOBILE INTERNET OF THINGS - A method for green communication for intelligent mobile internet of things includes: communicating with at least one mobile communication device by a lead communication device through visible light communication; determining the current communication environment between the lead communication device and the mobile communication device; controlling the operating mode of the mobile communication device according to the current communication environment; and forming a network with nodes of the network being the lead communication device and the at least one mobile communication device, configuring the lead communication device and the at least one mobile communication device as routers in the network, and transmitting multimedia information to other nodes of the network by using information shaping and compensation algorithms in a digital signal processing format. A system for green communication for intelligent mobile internet of things is also provided. | 03-03-2016 |
20160065307 | COMMUNICATION METHOD - A communication method for obtaining information from a subject includes obtaining image information of the subject in an image information-taking mode, obtaining visible light data of the subject in a visible light communication mode, and setting a shutter speed and an international organization for standardization (ISO) speed rating or a gain value for the visible light communication mode. The visible light communication mode is a different mode from the image information-taking mode. Also, in the setting, the shutter speed for the visible light communication mode is set to be faster than a shutter speed for the image information-taking mode, and the ISO speed rating or the gain value for the visible light communication mode is set to be greater than an ISO speed rating or a gain value for the image information-taking mode. | 03-03-2016 |
20160072581 | LIGHTING APPARATUS AND POSITIONING SYSTEM - A lighting apparatus that is used in a positioning system and is locatable in plural number in a limited area is provided. The lighting apparatus for use in the positioning includes a power supplier that supplies power, a lighting unit that is lit by the power supplied by the power supplier, and a beacon transmitter. The beacon transmitter operates by the power supplied by the power supplier, and transmits a beacon that is a signal for positioning. The beacon includes a long-distance beacon transmitted with first transmission power and a short-distance beacon transmitted with a second transmission power less than the first transmission power. The beacon transmitter transmits at least the long-distance beacon intermittently. | 03-10-2016 |
20160072584 | SELF IDENTIFYING MODULATED LIGHT SOURCE - In one aspect, the present disclosure relates to a self identifying light source including an emitter that produces visible light; and an autonomous modulator in electrical communication with the emitter that automatically and continually modulates the visible light produced by the emitter, wherein the modulated visible light represents an identification code of the light source. In some embodiments, the emitter is a light emitting diode (LED) and further comprises an LED driver that provides a specified voltage and current to each LED in the light source. | 03-10-2016 |
20160080077 | HIGH SPEED FREE-SPACE OPTICAL COMMUNICATIONS - High power, high speed VCSEL arrays are employed in unique configurations of arrays and sub-arrays. Placement of a VCSEL array behind a lens allows spatial separation and directivity. Diffusion may be employed to increase alignment tolerance. Intensity modulation may be performed by operating groups of VCSEL emitters at maximum bias. Optical communications networks with high bandwidth may employ angular, spatial, and/or wavelength multiplexing. A variety of network topologies and bandwidths suitable for the data center may be implemented. Eye safe networks may employ VCSEL emitters may be paired with optical elements to reduce optical power density to eye safe levels. | 03-17-2016 |
20160080089 | APPARATUS, SYSTEM AND METHOD FOR WIRELESS DATA TRANSMISSION BY USING DISPLAY BACKLIGHT - The present disclosure provides an apparatus, a system and a method for wireless data transmission by using a display backlight. The apparatus for transmitting wireless data by using a display backlight according to the present disclosure may include: a data storage unit for storing data to be transmitted; a main control unit for reading the data stored in the data storage unit; a signal modulation unit for modulating the data with a predetermined signal modulation method under the control of the main control unit to generate and output a sequence of switching pulse signals; a light source driving circuit for generating backlight driving switching pulse signals according to the sequence of switching pulse signals; and a display backlight member for outputting a sequence of light and shade signals. | 03-17-2016 |
20160094291 | OPTICAL COMMUNICATION DEVICE AND CONTROL METHOD THEREOF - An optical communication device and a control method thereof are provided. The optical communication device includes a driving module, a data transmission module, a light emitting module, and a feedback module. The driving module generates a driving current. The data transmission module generates a data current according to a piece of data. The light emitting module is electrically connected to the driving module and the data transmission module directly and emits visible light according to an illuminating current generated by combining the driving current with the data current. The feedback module adjusts a direct current (DC) potential of one of the driving current and the data current so as to make an average intensity of the visible light equal a preset intensity. | 03-31-2016 |
20160099773 | USE OF VERY HIGH FREQUENCY SWITCHING POWER CONVERTERS FOR ALSO MODULATING LIGHT OUTPUT FROM SOLID STATE EMITTER TO COMMUNICATE DATA - An example of a power and modulation circuit utilizes a very high frequency switching power converter to supply drive current power to cause a solid state light source to emit light. The power converter is configured to convert power from a power source to direct current to supply via the output to the light source, at least in part by a switching function of the power converter at a very high frequency rate. The circuit, in such an example, also includes a control circuit coupled to be responsive to input data and control operation of the power converter so that the current output to drive the light source modulates the light emitted from the light source to also carry the input data. | 04-07-2016 |
20160112124 | Free Space Optical Communication - An optical communications beacon receiver including a camera for capturing a plurality of beacon images. The plurality of beacon images includes a beacon signal transmitted from a beacon transmitter. The beacon receiver also including processing circuitry configured for determining the state of the beacon signal for each of the plurality of beacon images based on the known pattern, at least one beacon image of the plurality of beacon images includes a beacon on state and at least one beacon image of the plurality of beacon images includes a beacon off state, comparing the at least one beacon image including the beacon on state to the at least one beacon image including the beacon off state, and determining a beacon location based on the comparison of the at least one beacon image including the beacon on state to the at least one beacon image including the beacon off state. | 04-21-2016 |
20160112125 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING VISIBLE LIGHT DATA - An apparatus for receiving visible light data, including an image acquirer configured to acquire an image including a color code, the color code including a data region and a reference region; a detector configured to detect in the acquired image an object having a shape corresponding to the color code, determine a reference candidate region in the object, and determine the object to be the color code by comparing property information of the reference region with the determined reference candidate region; and a demodulator configured to demodulate visible light data from the data region. | 04-21-2016 |
20160112126 | DETECTING CODED LIGHT - A device comprising an input for receiving image data representing light captured by a camera, and an image analysis module for detecting a coded light component modulated into the light with a modulation frequency. The camera has an exposure time, and the light is captured over a sequence of exposures each lasting for an instance of the exposure time. The detection performed by the image analysis module experiences a frequency blind spot in said detection due to an effect of said exposure time. To address this issue, the device further comprises an output for controlling one or more parameters of the camera which affect the exposure time, and a controller configured to control the one or more parameters to avoid that the modulation frequency corresponds to the frequency blind spot. | 04-21-2016 |
20160112127 | Relay supported method, system, and relay node for transmitting visible light information - A relay supported method, system, and a RN for transmitting visible light information are provided. The method includes that UE sends information to a detected RN, and the RN processes and forwards the information from the UE to a VS. The RN is configured to process and forward the information from the UE to the VS in an uplink direction. According to the present disclosure, with adoption of visible light communication relay, visible light communication coverage may be broadened, and a visible light communication rate may be increased. | 04-21-2016 |
20160112128 | INFORMATION COMMUNICATION METHOD - An information communication method is provided for transmitting a signal using a change in luminance. The method includes determining a pattern of the change in luminance by modulating the signal to be transmitted, and transmitting the signal by a light emitter changing in luminance according to the determined pattern, wherein the pattern of the change in luminance is a pattern in which one of two different luminance values occurs in each arbitrary position in a predetermined duration. In the determining, the pattern of the change in luminance is determined so that a luminance change position in the duration is different for each of different signals to be transmitted, the luminance change position being a position at which the luminance rises or a position at which the luminance falls. | 04-21-2016 |
20160119170 | HOLEVO CAPACITY ACHIEVING JOINT DETECTION RECEIVER - An optical receiver may include a unitary transformation operator to receive an n-symbol optical codeword associated with a codebook, and to perform a unitary transformation on the received optical codeword to generate a transformed optical codeword, where the unitary transformation is based on the codebook. The optical receiver may further include n optical detectors, where a particular one of the n optical detectors is to detect a particular optical symbol of the transformed optical codeword, and to determine whether the particular optical symbol corresponds to a first optical symbol or a second optical symbol. The optical receiver may also include a decoder to construct a codeword based on the determinations, and to decode the constructed codeword into a message using the codebook. The optical receiver may attain superadditive capacity, and, with an optimal code, may attain the Holevo limit to reliable communication data rates. | 04-28-2016 |
20160119747 | SYSTEM AND METHOD FOR ESTIMATING THE POSITION AND ORIENTATION OF A MOBILE COMMUNICATIONS DEVICE IN A BEACON-BASED POSITIONING SYSTEM - An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device. | 04-28-2016 |
20160119756 | SYSTEM AND METHOD FOR ESTIMATING THE POSITION AND ORIENTATION OF A MOBILE COMMUNICATIONS DEVICE IN A BEACON-BASED POSITIONING SYSTEM - An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device. | 04-28-2016 |
20160134368 | LIGHT DETECTION SYSTEM AND METHOD - There is provided a light detection system which is capable of determining in light embedded codes by detecting light in a scene which is illuminated by an illumination system ( | 05-12-2016 |
20160134369 | SETTING UP HYBRID CODED-LIGHT - ZIGBEE LIGHTING SYSTEM - A lighting system ( | 05-12-2016 |
20160134370 | Visible Light Power-Carrying Communication System And Method - A visible light power-carrying communication system and method. The system includes a visible light power-carrying communication system of lighting facility end and a visible light power-carrying communication system of mobile user end, the latter at least includes an information transmission link, a signal collection module, a signal distribution module, an information receive link and a power collection link. The system and method combine a visible light communication system with wireless power transmission technologies, and add power link to collect power carried by a visible light signal with regard to characteristics of visible light communication system, forming a complete set of visible light power-carrying communication systems; combine advantages of visible light communication system, such as ultra-wide bandwidth, free frequency band, low power consumption of a transceiver, and solve problem that mobile terminal depends on power line by wireless power transmission technologies, realizing simultaneous wireless transmission of information and power realistically. | 05-12-2016 |
20160134371 | INFORMATION COMMUNICATION DEVICE - An information communication method is provided that includes continuously capturing an image of a subject that transmits a signal by changing luminance, with an image sensor. The method also includes displaying a captured image that includes a box and a subject image for identifying the subject, while continuously updating a position of the subject image on the captured image, according to a positional relationship between the image sensor and the subject established when the image of the subject is captured. The method further includes determining whether the subject image is in the box, and receiving the signal transmitted by the subject when it is determined that the subject image is in the box. In the receiving, information is obtained by demodulating a bright line pattern that appears in a second image data and corresponds to the plurality of exposure lines. | 05-12-2016 |
20160142138 | INFORMATION COMMUNICATION METHOD - An information communication method of transmitting a signal is provided that uses a change in luminance. The method includes determining a pattern of the change in luminance by modulating the signal to be transmitted, and transmitting the signal by a light emitter changing in luminance according to the determined pattern. The pattern of the change in luminance is a pattern in which one of two different luminance values occurs in each arbitrary position in a predetermined duration. The determining a pattern of change in luminance includes dividing the predetermined duration into four duration units, so that one of two different luminance value occurs in one duration unit of the four duration units and the other luminance value of the two different luminance value occurs in three duration units of the four duration units, the three duration units are other than the one duration unit. | 05-19-2016 |
20160164603 | MODULATION OF CODED LIGHT COMPONENTS - A coded light component is modulated into emitted light on one of multiple channels each having a different modulation frequency. Modulation in the light causes a receiving camera to experience an apparent temporal frequency due to sequential capture of multiple frames and an apparent spatial frequency due to sequential exposure of spatial portions within each frame. Each channel can be detected by a detection module of the camera based on a respective combination of values of the apparent temporal and spatial frequency corresponding to the respective modulation frequency. The detection module has a respective response on each channel that varies as a function of the apparent temporal frequency. The channel for modulating the coded light component is selected from amongst a predetermined set having a property that the response of the detection module on each channel will have a minimum substantially at the apparent temporal frequency of each other channel. | 06-09-2016 |
20160164604 | MULTI-STAGE AMPLITUDE MODULATION-BASED METHODS, APPARATUSES AND SYSTEMS FOR CODING AND DECODING VISIBLE LIGHT SIGNAL - The present application relates to multi-stage amplitude modulation-based methods, apparatuses, and systems for coding and decoding a visible light signal. The coding method includes the following steps: dividing to-be-transmitted information into multiple information units, where each information unit includes multiple bits; converting the multiple information units into multiple electrical signal units indicated by at least three levels, where an interval indicated by a first level in the at least three levels exists between adjacent electrical signal units, and each electrical signal unit uses a combination of other levels in the at least three levels to represent the multiple bits of a corresponding information unit; combining the electrical signal units to obtain a coded electrical signal; and transmitting the coded electrical signal in a visible light signal form. | 06-09-2016 |
20160164605 | METHOD, APPARATUS, AND SYSTEM FOR ENCODING AND DECODING VISIBLE LIGHT SIGNAL - The present disclosure provides a method, an apparatus, and a system for encoding and decoding a visible light signal. The encoding method includes the following steps: dividing to-be-transmitted data into a plurality of data units, where each data unit includes one or more bits; converting the data units into a plurality of electrical signal units, where for each electrical signal unit, the number of level transitions is used to represent the one or more bits of a corresponding data unit, and an interval indicated by a predetermined level exists between adjacent electrical signal units, where a level in each electrical signal unit has a first level duration, and the predetermined level between adjacent electrical signal units has a second level duration; combining the electrical signal units to obtain an encoded electrical signal; and transmitting the encoded electrical signal in a visible light signal form. | 06-09-2016 |
20160164606 | METHOD AND APPARATUS FOR RECEIVING VISIBLE LIGHT SIGNAL - The disclosure relates to a method and an apparatus for receiving a visible light signal. The method includes the following steps: controlling use of a camera as a light signal receiver to capture a group of continuous images covering an emitter, where the emitter emits visible light signals; and obtaining, from the group of continuous images, a visible light signal that comes from the emitter. In the disclosure, because a camera is used to receive a visible light signal, a visible light communication function can be implemented in various devices or systems under a premise that no hardware is newly added or modified. | 06-09-2016 |
20160164608 | Network Security and Variable Pulse Wave Form with Continuous Communication - A pulsed light communication device has a plurality of indicator light emitting diodes emitting diodes emitting at least one of a plurality of wavelengths of colored light to correspond to a designated color assigned to a security level for a network. A continuous uninterrupted modulated pulsed light emitting diode light signal may be generated having a sensitivity threshold detection level exceeding minimal parameters of a photodetector. | 06-09-2016 |
20160183067 | A COMMUNICATION APPARATUS, A COMMUNICATION ARRANGEMENT AND A COMMUNICATION METHOD | 06-23-2016 |
20160191155 | INFORMATION COMMUNICATION METHOD - An information communication method of transmitting a signal using a change in luminance is provided. The information communication method includes: determining a pattern of the change in luminance, by modulating the signal to be transmitted; and transmitting the signal, by at least one light emitter changing in luminance according to the determined pattern of the change in luminance. In the determining, a first luminance change pattern corresponding to a body which is a part of the signal and a second luminance change pattern indicating a header for specifying the body are determined. In the transmitting, the header and the body are transmitted by the at least one light emitter changing in luminance according to the first luminance change pattern, the second luminance change pattern, and the first luminance change pattern in the stated order. | 06-30-2016 |
20160191156 | VISIBLE LIGHT COMMUNICATION APPARATUS AND METHOD OF VISIBLE LIGHT COMMUNICATION - A visible light communication apparatus and a method for visible light communication are provided. The method includes calculating a quantity of terminals in coverage of each of a plurality of visible light sources. The visible light sources include a first visible light source and a second visible light source. Determining a quantity of the sub-bands according to the quantity of terminals. The sub-bands include a first sub-band and a second sub-band. Distributing the first sub-band for the first visible light source and the second sub-band for the second visible light source according to the quantity of terminals in coverage of each of the visible light sources, in which the first sub-band and the second sub-band are different from each other. Allocating a bandwidth for each of the terminals according to the distributed sub-bands or a user requirement. Modulating a transmission data on one of the first sub-band and the second sub-band. | 06-30-2016 |
20160191157 | LIGHTING DEVICE AND VISIBLE LIGHT COMMUNICATION SYSTEM - A lighting device includes: a first light source which emits light that includes a visible light communication signal indicating first information; and a second light source which is disposed at a position different from a position of the first light source, and emits light that includes a visible light communication signal indicating second information different from the first information. | 06-30-2016 |
20160191160 | APPARATUS AND METHOD FOR GENERATING VISIBLE SIGNAL ACCORDING TO AMOUNT OF DATA TRANSMISSION IN VISIBLE LIGHT COMMUNICATION SYSTEM - A method and apparatus are provided for generating a visible light signal according to an amount of data transmission in a first Visible Light Communication (VLC) device. The method includes determining a ratio of an amount of data that has been received from a second VLC device to a total amount of data to be received; determining a visible light signal pattern corresponding to the ratio; generating a visible light signal corresponding to the visible light signal pattern; and outputting the visible light signal. | 06-30-2016 |
20160195604 | SYSTEM AND METHOD FOR ESTIMATING THE POSITION AND ORIENTATION OF A MOBILE COMMUNICATIONS DEVICE IN A BEACON-BASED POSITIONING SYSTEM | 07-07-2016 |
20160195605 | SYSTEM AND METHOD FOR ESTIMATING THE POSITION AND ORIENTATION OF A MOBILE COMMUNICATIONS DEVICE IN A BEACON-BASED POSITIONING SYSTEM | 07-07-2016 |
20160204859 | EFFICIENT ADDRESS ASSIGNMENT IN CODED LIGHTING POSITIONING SYSTEMS | 07-14-2016 |
20160204860 | METHOD FOR COMMUNICATING IN A MAGNETIC RESONANCE APPARATUS AND MAGNETIC RESONANCE APPARATUS OPERATING THEREWITH | 07-14-2016 |
20160254864 | LIGHTING BASED AUTHENTICATION OF A MOBILE ELECTRONIC DEVICE | 09-01-2016 |
20160380697 | DECODING APPARATUS, DECODING METHOD AND NON-TRANSITORY COMPUTER READABLE RECORDING MEDIUM | 12-29-2016 |
20170237486 | VISUAL COMMUNICATION BETWEEN MOBILE COMMUNICATION DEVICES AND DRUG DELIVERY DEVICES | 08-17-2017 |
20170237487 | SYSTEM AND METHOD FOR LIGHTING AND BUILDING OCCUPANT TRACKING | 08-17-2017 |
20170237488 | REPRODUCTION METHOD FOR REPRODUCING CONTENTS | 08-17-2017 |
20190149234 | LI-DRIVE | 05-16-2019 |
20220140900 | FREE SPACE OPTICAL COMMUNICATIONS TERMINAL - A free space optical communications transmitter terminal including an optical source arranged to provide a first beam of light encoding information to be communicated; an optical source arranged to provide photons encoding bits of a key of a Quantum Key Distribution protocol; and an optics arrangement. The first beam and the photons are linearly polarised. The optics arrangement is configured to combine the first beam and the photons into a single, second, beam to be transmitted to a receiver terminal; and transform the linear polarisation of the first beam into one of left and right circular polarisation and transform the linear polarisation of the photons into the other of left and right circular polarisation. A receiver terminal receives the second beam, transforms the circular polarisations into orthogonal linear polarisations, and filters out the linear polarisation of the first beam to allow the photons to pass to a single photon detector. | 05-05-2022 |