Abstract:
본 발명은 제한 수신 방송 서비스를 제공하는 AT-DMB 송신 및 수신 시스템 및 그 방법에 관한 것이다. 본 발명은 기존의 T-DMB 시스템과 상이한 AT-DMB 시스템에서 유료화 서비스 제공을 위한 제한 수신 시스템을 적용하는 방법을 제공한다. 본 발명은 가입자가 많아질 경우 제한 수신 데이터의 증가로 인하여 기존의 T-DMB의 유효 전송량이 줄어드는 문제점을 AT-DMB의 늘어난 가용 전송량을 통해서 해결할 수 있다. T-DMB, AT-DMB, CAS, 유료화 서비스, 제한 수신 방송 서비스
Abstract:
PURPOSE: A re-transmitting and re-receiving method of a packet in an overlay network is provided to efficiently re-transmit a packet by preventing radio resources from being wasted in an overlay network for high speed and massive wireless telecommunication. CONSTITUTION: A first base station transmits a packet to a terminal and a second base station(S110). The second base station notifies the normal reception state of the packet to the terminal(S120). The terminal notifies the normal reception state of the packet to the first base station and the second base station(S130). The first base station and the second base station receiving an NACK(Negative Acknowledgement) signal from the terminal determines a base station which will take charge of retransmission. The first base station and the second base station performs retransmission according to the determination(S140).
Abstract:
PURPOSE: A wireless energy charging method using illumination and an apparatus using the same are provided to charge an electronic device using wireless optical energy without replacing a battery. CONSTITUTION: A wireless optical energy charging system(1) comprises an LED lighting device(10) and an electronic device(20). The LED lighting device comprises an LED lamp(100), a spatial light modulator(110), a lighting control circuit(120), a spatial light modulator control circuit(130), a wireless communication receiver(140), and a transmission antenna(150). The electronic device comprises a photo receiver(200) for wirelessly receiving a visible light signal, a solar cell(210), a wireless communication transmitter(220), and an antenna(230). The lighting control circuit controls an on/off state of the LED lamp. The wireless communication receiver is connected to the antenna.
Abstract:
PURPOSE: A broadcasting receiver and a system thereof are provided to enable a viewer to select a caption and to display the selected caption. CONSTITUTION: A baseband converter(210) extracts screen information and voice information from an inputted broadcast signal. A local wireless broadcasting device(220) separates character information from the extracted screen information. The local wireless broadcasting device transmits the separated character information through wireless communication. A display device(230) displays the extracted screen information. A speaker device(240) outputs the extracted voice information into an analog signal.
Abstract:
PURPOSE: A multi-stream paralleling method and apparatus using a pseudo-centralized control type beaconing operation process on a wireless distributed beaconing system is provided to enhance the controlling function of a network on the wireless distributed beaconing system. CONSTITUTION: A multi-stream paralleling method using a pseudo-centralized control type beaconing operation process on a wireless distributed beaconing system comprises the following steps: checking if an allocated beacon slot is the last beacon slot on a beacon section(210); generating a network coordinate beacon for sharing network information if the allocated beacon slot is the last beacon slot based on most recently updated beacon information(220); and transmitting the network coordinate beacon(230).
Abstract:
PURPOSE: An apparatus and a method for transmitting and receiving data are provided to lower a PAPR(Peak to Average Power Ratio) from a system which transmits data by using OFDM(Orthogonal Frequency Division Multiplexing). CONSTITUTION: A SPC(Serial to Parallel Converter)(110) changes a plurality of serial data signals into a plurality of parallel data signals. A pilot generating unit(120) generates one or more pilot signals. A symbol mapping unit(130) generates one or more pilot symbols and a plurality of data symbols. A pilot arrangement unit(140) arranges one or more pilot symbols and the plurality of data symbols. A real number signal converting unit(150) changes one or more pilot symbols and the plurality of data symbols changes into a real number signal in a time domain. Each modulation unit(160) adjusts the size of the real number signal by modulating the real number signal. A PCPN(PAPR Control and Power Normalize unit)(170) controls a PAPR(Peak to Average Power Ratio) by adjusting the size of a sine component of the modulated real number signal. A signal transmission unit(180) changes a power normalized signal into a radio frequency signal.
Abstract:
PURPOSE: A multi-channel broadcast projection TV(TeleVision) apparatus using visible lighting and method thereof are provided to enable a user to control focus at a desired screen by using LED(Light Emitting Diode) lighting. CONSTITUTION: A TV broadcast reception circuit(140) separates a TV broadcast signal into a video signal and an audio signal. A wire and wireless communication unit(150) receives view information through the remote controller of a user(160). A control circuit for a spatial light modulation unit(130) receives the video signal corresponding to a desired channel from the TV broadcast reception circuit. The spatial light modulation unit modulates the video signal through a spatial light modulation unit(120). The user controls a screen direction by using the remote controller in order to project a TV image.
Abstract:
PURPOSE: A wireless visual ray broadcast apparatus using a beam forming method and method thereof are provided to embody a high speed wireless broadcast system by receiving a direction code from a terminal. CONSTITUTION: An LED lighting apparatus(10) transmits a reference signal to a terminal(20) in one or more directions. The terminal extracts a visible ray wireless channel coefficient from the reference signal. The terminal transmits a direction code corresponding to the extracted visual ray wireless channel coefficient. The LED lighting apparatus changes the visual ray into a beam in a terminal by using a direction code received from the terminal.
Abstract:
본 발명은 중계 장치 및 그의 중계 방법에 관한 것으로, 중계 장치 내의 레퍼런스 신호를 이용하여 수신 안테나를 통해 수신한 수신 신호 중 궤환 신호를 제거함으로써, 송신 안테나를 통해 재송신하는 신호의 출력을 높일 수 있어 신호 전달 영역을 넓힐 수 있고, 네트워크 구성시 비용을 절감할 수 있다. 또한, 본 발명은 궤환 신호가 제거된 수신 신호의 채널을 추정하여 신호의 왜곡을 보상함으로써, 수신 신호의 품질을 높일 수 있다. 중계, 궤환 신호, 심볼, 채널, 추정, 에코 제거
Abstract:
본 발명은 계층 변조가 적용된 지상파 DMB 시스템에서 변조 모드 검출 신호를 송신하는 방법 및 장치에 관한 것이다. 이를 위하여, 본 발명은 이동 방송 서비스를 위하여 입력된 제1 신호와 계층 변조를 위하여 입력된 제2 신호를 합하여 계층 변조가 적용되지 않는 신호를 검출하고, 사전에 설정된 시간 간격에 따라 하나 이상의 신호로 분할하여 각각의 분할된 신호에 암호화/복호화를 위한 시퀀스를 삽입한 뒤, 다시 합하여 송출하는 변조 모드 검출 신호 송신 방법을 제공한다. 또한, 본 발명은 이동 방송 서비스를 위하여 입력되는 신호를 처리하는 제1 신호 처리부; 계층 변조를 위하여 입력되는 신호를 처리하는 제2 신호 처리부; 및 제1 신호와 제2 신호를 합하여 시간 간격에 따라 분할하고, 분할된 신호에 암호화/복호화를 위한 시퀀스를 삽입시켜 송출하는 시퀀스 삽입부를 포함하는 변조 모드 검출 신호 송신 장치를 제공한다. 본 발명에 의하면, 이동 방송 시스템의 수신단이 새롭게 추가된 신호에 적용된 변조 방식을 용이하게 검출할 수 있으며, 복수 개의 변조 방식을 동시에 사용할 수 있어 데이터 전송률을 추가로 향상시킬 수 있다. DMB, T-DMB, 계층 변조, PN 시퀀스, PRS, 성상비