Abstract:
PURPOSE: A method and a device for outputting a visible frame in a visible light communication system providing a multi communication mode are provided to outputs a visible frame for communication link connection even if a communication link connection is released. CONSTITUTION: A visible light transmitting and receiving unit(240) transceives a visible light signal. A control unit(210) determines visible frame output method according to a communication mode which a visible light communication device will perform. The control unit controls the visible light transceiving unit to transmits a communication mode and a visible frame output method to a receiving side visible light communication device through a visible light transceiving unit.
Abstract:
PURPOSE: A line coding apparatus and a method for transmitting data in a visible light communication system are provided to reduce errors caused by the synchronization of continuous input bit 0. CONSTITUTION: A data input unit(210) is a transmission data input unit. According to a present bit level, an encoding unit(220) encodes a clock signal and a data signal of the data input unit. If the continuous 5 input bits 0 in the encoding operation, the encoding unit performs an encoding operation in an encoding mode which transits the initial and last bits as much as half bit. A transmission unit(230) transfers an encoded signal of the encoding unit as a visible light.
Abstract:
PURPOSE: A communication link arranging method using a retroreflector in visible light communication and a device for the same are provided to perform bi-directional communication arrangement only with one directional visible light transmission when visible light communication using the retroreflector. CONSTITUTION: A visible light transmission unit(120) outputs a communication setup signal for communication direction setup and a data transmission signal in the form of visible light. The visible light reception unit(130) receives a visible light signal. A retroreflector(150) retroreflects the received visible light signal. A control unit(110) receives the communication setup signal from the retroreflector to retroreflect the signal. The control unit establishes a communication direction of the visible light transmission unit to a retroreflected direction.
Abstract:
A wireless input device is provided to be used in a television or board for an interactive communication within long and short distance. A wireless input device(100) comprises a screen(110), an optical division array(120), a light source(200), and a light receiving arrays(131,132,133). The optical division array has a plurality of beam splitters. The optical division array is located in the rearward of screen. The light source produces the indication light. The light source outputs the generated indication light as described above to the optical division array through screen. The light receiving array detects the indication light divided in the optical division array.
Abstract:
A navigation system and a method using the visible light communications are provided to measure the exact location of the mobile terminal by assembling the light of the different wavelength band based on the color diagram. A transmitter equipped a lamp emits the visible light signal combined to the different wavelengths. The visible light signal comprises the information for providing the function of navigation. The mobile terminal receives the visible light signal from a plurality of lamps(412). The location information of the current position of the mobile terminal is obtained by using a visible light signal(418). The navigation information is displayed in a mobile terminal(421). The navigation information comprises the information matching the location information with the map information.