摘要:
A cell-planning method for a wireless optical communication system includes: implementing a target region for constructing a wireless optical communication system as a virtual space; disposing a virtual light source within the virtual space; checking a sequence number of a virtual light ray generated by the virtual light source; checking the number of intersection points occurring between the virtual light ray, the sequence number of which has been checked, and surfaces of virtual objects, and comparing the number of intersection points of the virtual light ray with an allowable number of intersection points; storing the virtual light ray when the number of intersection points of the virtual light ray is greater than the allowable number of intersection points; and comparing the sequence number of the virtual light ray with a set number of virtual light rays.
摘要:
A method and apparatus for providing additional information included in a video displayed on a display device using visible light communication (VLC). A data packet including video data and additional information for an object included in the video data is received. The video data is extracted from the data packet, and the video data is decoded. The additional information from the data packet is extracted, and the additional information decoded. The decoded video data is output through the display device, and at the same time, the additional information is transmitted for a particular object included in a video based on a VLC protocol using a light emitting device prepared in the display device. The additional information providing apparatus includes an image sensor module, a display module, a visible light receiving module, an additional information manager and a controller.
摘要:
Method and device for exchanging messages in a VLC navigation system is provided, in which a map server generates a provision message in the form of visible light signals through all lamps in an area, using a PLC network, where a navigation service is provided, a terminal that wants to implement the navigation service among terminals that have received the provision message transmits a registration request message to the map server, the map server transmits a registration response message for the registration request message to the terminal, the terminal transmits a map request message including information about a destination to the map server, the map server transmits a map response message including information about a path to the destination to the terminal, and the terminal displays map information and the path.
摘要:
A wireless visible light communication system is provided. The system includes optical transmitters and optical receivers for receiving optical signals, wherein each of the optical transmitters includes a first light source for generating an optical signal, and at least one light source capable of generating light which has a color equal to that of the optical signal, and has a wavelength different from that of the optical signal.
摘要:
An optical receiver for visible light communication includes a lens system for converging visible light for light communication and an optical filter for passing converged visible light to the optical receiver. A photoelectric transmission device detects data from visible light for light communication in a VLC system. An optical filter is positioned between the lens system and the photoelectric transmission device, the optical filter having a first film for transmitting visible light and a second film arranged/grown around the first film to transmit ultraviolet rays or infrared rays. A first optical detects data from visible light passing through the first film of the optical filter. A second optical detector detects the intensity of light transmitting the second film. The encoding, encoding rate or intensity of the optical transmitted signal can be adjusted in response to the detection of at least the second optical detector.
摘要:
A method for transmitting/receiving data between first and second terminals in which data can be transmitted flexibly in each particular situation, i.e. according to the network environment of terminals between which visible light communication occurs, including the type and characteristics of transmitted data. The method includes the steps of: (a) connecting a communication link between a first terminal supposed to transmit data and a second terminal supposed to receive data; (b) determining a data transmission rate to be used for data communication; (c) allocating a transmission channel of a specific band within a frequency band enabling wireless communication; (d) establishing a data transmission environment based on consideration of the transmission rate and the transmission channel; and (e) conducting data communication between the first and second terminals with reference to the data transmission environment.
摘要:
Method and device for exchanging messages in a VLC navigation system is provided, in which a map server generates a provision message in the form of visible light signals through all lamps in an area, using a PLC network, where a navigation service is provided, a terminal that wants to implement the navigation service among terminals that have received the provision message transmits a registration request message to the map server, the map server transmits a registration response message for the registration request message to the terminal, the terminal transmits a map request message including information about a destination to the map server, the map server transmits a map response message including information about a path to the destination to the terminal, and the terminal displays map information and the path.
摘要:
Method and device for exchanging messages in a VLC navigation system is provided, in which a map server generates a provision message in the form of visible light signals through all lamps in an area, using a PLC network, where a navigation service is provided, a terminal that wants to implement the navigation service among terminals that have received the provision message transmits a registration request message to the map server, the map server transmits a registration response message for the registration request message to the terminal, the terminal transmits a map request message including information about a destination to the map server, the map server transmits a map response message including information about a path to the destination to the terminal, and the terminal displays map information and the path.
摘要:
A method for transmitting/receiving data between first and second terminals in which data can be transmitted flexibly in each particular situation, i.e. according to the network environment of terminals between which visible light communication occurs, including the type and characteristics of transmitted data. The method includes the steps of: (a) connecting a communication link between a first terminal supposed to transmit data and a second terminal supposed to receive data; (b) determining a data transmission rate to be used for data communication; (c) allocating a transmission channel of a specific band within a frequency band enabling wireless communication; (d) establishing a data transmission environment based on consideration of the transmission rate and the transmission channel; and (e) conducting data communication between the first and second terminals with reference to the data transmission environment.
摘要:
Disclosed is a method for processing incoming signals of photo-detectors in a visible light communication system. The method includes: dividing symbol duration into divided durations according to an equal time interval to set the divided durations to a plurality of time slots, the symbol duration being a time required to transmit one of a symbol and a bit; receiving visible light signals through a photodiode array in a receiver; determining a gain value of each of the photodiodes during a time slot, in consideration of each photodiode area on the photodiode array during the time slot and the time slot position within the symbol duration; multiplying a gain value of each of the photodiodes by an output value of a corresponding photodiode; and summing up output values of each of the photodiodes by which the gain value has been multiplied and calculating a total of output values of the time slot.