Abstract:
PURPOSE: A method for estimating an integer frequency offset having an equal value based on pilots in an OFDM(Orthogonal Frequency Division Multiplexing) system is provided to determine the biggest integer frequency offset candidate value as a final integer frequency offset by calculating a real number component about a plurality of correlation values. CONSTITUTION: Fast Fourier transform(201) changes a received signal into a frequency domain signal. A symbol acquisition unit(202) obtains one or more consecutive OFDM(Orthogonal Frequency Division Multiplexing) symbols. A plurality of received signal moving units(203) obtains a second frequency band by transferring a first frequency band of the OFDM symbol. A pilot classifying unit(204) classifies an index of pilots having an equal value based on a pilot value obtained through the received signal moving unit. A plurality of correlation units(205) calculates a correlation value about all pilots having the equal value in the second frequency band. An integer frequency offset estimating unit(206) finally determines an integer frequency offset from a plurality of integer frequency offset candidate values.
Abstract:
PURPOSE: A context recognition monitoring system using a ship ubiquitous sensor network is provided to continuously collect accurate data by enabling a central management ship to give the operation control of a sensor to other ships. CONSTITUTION: A sensor operation control unit(125) operates necessary sensors according to roles of a ship from one or more sensors installed in the ship. A context recognition management unit(123) recognizes the operation of the ship or context required for the work or operation of the ship based on the data collected by the sensor. The situation recognition management unit transmits the recognized results to other ships. When abnormal context is generated in the collected data, the context recognition management unit stops the operation of a sensor corresponding to the collected data.
Abstract:
PURPOSE: A system for controlling a ship steering gear is provided to reduce the burden of an operator by estimating an operation behavior using brain waves of the operator and controlling a ship steering gear according to the estimated result. CONSTITUTION: A brain wave measuring unit(110) measures brain waves of an operator. A brain wave analyzer(120) grasps the movement of the operator by analyzing the measured brain waves. A database(130) includes SVM algorithm. A ship steering control unit(140) controls a ship according to the movement of the operator.
Abstract:
본 발명은 초광대역 (Ultra Wideband, 이하 'UWB') 통신에 관한 것으로서, 더욱 상세하게는 UWB 통신의 다중 경로 채널 환경 하에서 UWB 수신기에서의 신호를 획득하기 위한 초광대역 시스템의 신호 수신 장치 및 방법에 관한 것이다. 이를 위해 본 발명은 초광대역 송수신 시스템에 있어서, 상기 송신 시스템에서 다중경로 채널을 경유하여 입력되는 적어도 하나 이상의 수신 신호를 입력받는 안테나와; 상기 수신 신호와 시간지연된 참조신호를 곱하고, 상기 곱한 결과 신호를 적분한 파워값을 출력하는 병렬 상관부와; 상기 적어도 하나 이상의 파워값을 기 설정된 개수만큼 합한 값들 중 가장 큰 값을 추출하는 제1 신호획득부 및; 상기 제1 신호획득부에서 추출된 상기 가장 큰 값 중, 상기 가장 큰 값을 구성하는 각각의 파워값을 측정하여 그 중, 가장 큰 파워값을 가지는 상관값을 추출하는 제2 신호획득부를 포함한다. UWB, 곱셈기, 상관기, 참조신호
Abstract:
PURPOSE: A signal receiving apparatus of a UWB(Ultra WideBand) system and a method thereof are provided to acquire a signal in a multiple paths channel environment in order to have high detection probability. CONSTITUTION: A parallel correlation unit(120) multiplies a reception signal and a reference signal in which the time is delayed. The parallel correlation unit outputs a power value with which the multiplied result signal is integrated. A first signal acquiring unit(130) extracts one or more power values. A second signal acquiring unit(140) measures the power value consisting of the greatest value from the first signal acquiring unit.
Abstract:
본 발명은 직접 수열 확산 대역 시스템의 고속 부호 획득을 위한 순차 추정 기법들의 성능 분석 방법에 관한 것으로서, 구체적으로 RASE, SASE, RSSE 기법들에 대한 칩 추정 성능을 비교하여 고속 부호 획득을 위한 방법에 관한 것이다. 본 발명은 직접 수열 확산 대역 시스템의 고속 부호 획득을 위한 순차 추정 기법들의 성능 분석 방법으로 RASE, SASE, RSSE 기법들의 코드 길이를 같게 설정하여 모니터링 함으로써 상기 RASE, SASE, RSSE 기법들의 신호 획득 성능을 상대적으로 비교 분석한다.
Abstract:
The present invention relates to a communication device for underwater activities and supervision thereof. The communication device for underwater activities and supervision thereof according to the present invention allows a coach in the outside of water to instruct a swimmer in the water based on wireless communications. According to the present invention, efficiency for supervising a swimmer can be improved since the coach can instruct such as posture correction and pacing while the swimmer swims in the water. [Reference numerals] (110) Microphone; (130) Transmitter; (210) Receiver; (230) Amplifier; (240) Bone conduction earphone
Abstract:
The present invention provides a method for configuring a Zigbee based integrated information network using a WiMedia network comprising the steps of: acquiring information on surroundings by using Zigbee sensors in the Zigbee based integrated information network including the Zigbee sensors, a reservation subject node (S node), a reservation target node (T node) and a relay node (R node); transmitting the acquired information to a server via the reservation subject node (S node) and the reservation target node (T node); storing the information, transmitted to the server, at a database; and displaying the information stored at the database. The present invention uses the Zigbee technology based on the WiMedia network in a ship, thereby configuring a network environment within the ship and transmitting data at a high speed over the network. Additionally, the present invention may increase more a communication frequency band, enhance communication quality by improving quality factors, and reduce data loss by switching a node, if its communication state with another node is not good, to the relay node.