Abstract:
PURPOSE: An optical data receiving method and optical data receiving apparatus for the same are provided to transmit optical data through an image recording apparatus and receive optical data through color filtering. CONSTITUTION: An optical data receiver photographs an optical data transmitter(S711). The optical data receiver performs color filtering about photographing image data(S712). It is determined whether optical data receiver exists(S713, S750). The optical data receiver searches for existing coordinates(S760). The optical data receiver performs collection and processing of optical data(S790).
Abstract:
PURPOSE: A visible light communication device and a method using the same, capable of offering visual information are provided to selectively operate light source used for data transmission. CONSTITUTION: A light source selecting unit(2110) selects one or more light sources in consideration of the visual information distinguished according to the wavelength. A visible light communication unit(2120) performs visible light communication in order to recognize the visual information about a color. The visual information is transmitted by using a color packet.
Abstract:
An apparatus and method for local area communication between Bluetooth and MBOA-MAC devices is provided. A new Bluetooth Protocol Adaptation Layer (PAL) is implemented to adapt a Bluetooth host module and an MBOA-MAC to each other so as to enable use of conventional legacy Bluetooth applications in a wireless network environment employing a WiMedia Multiband OFDM Alliance (MBOA)-based Media Access Control (MAC) layer. This allows devices equipped with a conventional Bluetooth host module to perform high-speed data communication based on MBOA-MAC, thereby increasing the efficiency of utilization of networks.
Abstract:
An apparatus and a method for supporting a high speed communication service using a UWB(Ultra-Wide Band) technique are provided to apply Bluetooth technique to various application devices to thus extend services up to video-centered services as well as audio-centered services. A PAL(Protocol Application Layer) management entity(110) splits command data received from an upper layer, a Bluetooth region, into local state and remote state commands to perform event processing, and processes command data received from a lower layer, a UWB region, to transmit the same to the upper layer. An FCSL(Frame Convergence Service Layer) entity(120) generates a PAL packet having the command data received from the upper layer in UWB data and transmits the generated PAL packet to the lower layer. The FCSL entity interprets a data type received from the lower layer, and if the received data type is command data, the FCSL entity transmits the received command data to the PAL management entity. The upper layer and the lower layer are connected to support a high speed communication service.
Abstract:
PURPOSE: A sub-carrier allocation system for OFDM communication, an allocating method thereof, and a recording medium for storing an allocation program are provided to overcome a limit of an existing system by allocating a sub-carrier group of a terminal of an ascending order considering the sub-carrier group of the terminal of a descending order. CONSTITUTION: A base station(100) includes a transmitter, a receiver, an MCS(Modulation and Coding Scheme) collector, a priority allocator, and a sub-carrier allocator. The transmitter(150) and the receiver(110) are used for transmitting and receiving traffic and a control signal by using a terminal and a sub-carrier group. The MCS collector(120) is used for collecting MCS control signals. The priority allocator(130) is used for deciding the priority of a sub-carrier group by using MCS control data, and a sub-carrier allocator. The sub-carrier allocator(140) is used for allocating sub-carrier groups to each terminal. The terminal(200) includes a transmitter, a receiver, a channel state estimator, and an MCS selector. The transmitter(240) and the receiver(210) are used for transmitting and receiving MCS control data. The channel state estimator(220) is used for extracting the MCS control data of each sub-carrier group. The MCS selector(230) is used for selecting the sub-carrier group having the particular MCS.
Abstract:
PURPOSE: A method is provided to increase throughput of system traffic of down link in OFDMA(orthogonal frequency division multiple access)/FDD(frequency division duplex) communication system by transmitting MCS(modulation and coding scheme) related control data at a time. CONSTITUTION: A method comprises a first step of permitting a terminal to be allocated with the highest cluster group by a base station when a call is set between the terminal and a base station; a second step of permitting the terminal to check the position of the cluster having the best radio environment from among the lowest cluster group included in the cluster of the corresponding group; a third step of permitting the terminal to determine the cluster group level having a high similarity by judging the similarity of clusters of the lowest group with respect to the clusters of the group excluding the upper group including the cluster of the lowest group; a fourth step of permitting the terminal to compare radio environments of the clusters checked in the second step, and determine MCS level corresponding to the lowest radio environment; and a fifth step of permitting the terminal to transmit, to the base station, MCS related control data including the position of the cluster checked in the second step, cluster group level determined in the third step, and the MCS level determined in the fourth step.
Abstract:
PURPOSE: A dynamic allocation search device using a time division method is provided to allocate a sub-search device to another user in a suitable time although a conventional user does not release the allocation of the sub-search device. CONSTITUTION: A user information transmitting unit(22) transmits information of several users, which it is necessary for retrieving a multi-path, to a plurality of search device engine control units(23). A plurality of search device engine control units(23) receive several user information from the user information transmitting unit(22), and control the allocation, reallocation, cancellation operation of a plurality of search device engine units(25). A plurality of search device engine units(25) are divided in time and are operated for despreading signals received through the multi-path and coherently accumulating the despreaded signals by a symbol unit. A unit symbol accumulation storing unit(26) stores coherently accumulated unit symbols of another user, which are simultaneously transmitted from a plurality of search device engine units(25). A unit symbol signal control unit(24) controls the unit symbol accumulation storing unit(26) for successively transmitting unit symbol accumulation signals stored in the unit symbol accumulation storing unit(26) to a path arrangement and decision unit(27), and controls the path arrangement and decision unit(27). The path arrangement and decision unit(27) coherently accumulates each user-classified unit symbol accumulation signal outputted from the unit symbol accumulation storing unit(26), arranges the accumulated results, and decides an offset of the signal inputted through the multi-path.
Abstract:
PURPOSE: A demodulating apparatus in a mobile communication terminal for canceling a pilot signal of an adjacent base station, and a method therefor are provided to cancel a pilot interference signal transmitted from a base station of an adjacent cell and improve forward link capacity. CONSTITUTION: A searcher(202) searches signals received from peripheral base stations of an area in which a mobile communication terminal is located. Fingers(203-206) perform a channel estimation and a synchronous tracking with respect to the signals received from the peripheral base stations, and estimate and generate interference signals. A pilot signal interference canceller(220) calculates the interference signals outputted from the fingers(203-206) and the signals received from the peripheral base stations, and cancels the interference signals. A delay(240) delays a time required when generating the interference signals estimated in the fingers(203-206).