Abstract:
According to the present invention, in a communication system, a digital to analog converter and an analog to digital converter capable of processing a lower bit at a high rate are used in data signal processing according to an analog to digital conversion and a digital-analog conversion, and an analog to digital converter capable of processing a higher bit at a low rate is used in signal processing for sync acquisition. [Reference numerals] (211) Frame generator; (212) Demultiplexer; (215) Reference signal generator; (216) Clock generator; (221) Duplexer (switch); (229) MUX; (233) Synchronizer; (234) Clock controller
Abstract:
이동성 센서 노드의 위치 관리 시스템 및 방법이 개시된다. 이동성 센서 노드의 위치 관리 시스템은 센서 네트워크와 연결되는 게이트웨이(gateway)의 설치에 연동하여, 상기 게이트웨이에 관한 정보를 작성하고, 상기 작성된 게이트웨이에 관한 정보를 데이터베이스에 저장하는 처리부와, 제1 게이트웨이에 센서 노드가 접속되는 경우, 상기 제1 게이트웨이로부터 상기 센서 노드의 식별정보를 수신하고, 상기 수신된 센서 노드의 식별정보 및 상기 데이터베이스로부터 추출한 상기 제1 게이트웨이에 관한 정보를 이용하여, 상기 센서 노드에 관한 제1 정보를 작성하는 제어부를 포함한다.
Abstract:
주파수 합성 장치 및 방법이 개시된다. 주파수 합성 장치는, 기준 주파수를 기초로 일정한 주파수를 유지하도록 발진 주파수를 출력하는 위상 동기 합성부(PLL synthesizer), 발진 주파수를 분주하여 출력하는 분주기(Divider), 분주된 주파수의 위상을 천이시키는 위상 천이기, 위상 천이된 주파수를 상향 변환(Up Conversion)하여 출력하는 혼합기, 발진 주파수를 체배하여 출력하는 체배기(Multiplier), 및 체배된 주파수 및 상기 상향 변환된 주파수 중 어느 하나를 선택적으로 출력하는 스위치를 포함할 수 있다. 이에 따라, 빠른 주파수 스위칭을 제공할 수 있다.
Abstract:
PURPOSE: A sensor network system and control method thereof are provided to communicate between sensor nodes by using minimum RF(Radio Frequency) strength which is necessary for communication by calculating the minimum RF strength. CONSTITUTION: A source sensor node creates a loopback test request message according to the occurrence of previously established events. The source sensor node transmits the loop-back test request message to a destination sensor node(S100). The source sensor node receives a loopback test response message from the destination sensor node(S200). The source sensor node establishes RF(Radio Frequency) gain values of a wireless communication module within the source sensor node based on analysis results of the received loopback test response message.
Abstract:
PURPOSE: A wireless energy and data transceiver and a method thereof are provided to form a resonator and a radiator into one body by using multiplied frequency several or several tens of times power transmission frequency for far-field communication. CONSTITUTION: Energy with frequency f0 is transmitted to a resonator(206) via a power amplifier(202) and a first matching circuit(204). The energy transmitted to the resonator is delivered to a receiving-side resonator(300) using resonation and used as power source for a load or communication module of a receiving device(104). A data signal generated from a communication module(208) is mixed with a return frequency signal provided from a local oscillator(210) through a frequency mixer(212). The mixed signal is amplified through a signal amplifier(214) and transmitted to a radiator(218) through a second matching circuit(216). The transmitted signal is received by a receiving-side radiator(308).
Abstract:
Provided is a digital predistortion linearizer applicable to millimeter-wave band point-to-point communications. The digital predistortion linearizer includes a transmission unit and a reception unit. The reception unit receives a first signal including a transmission signal and a distortion signal through a millimeter-wave propagation environment, detects the distortion signal from the first signal, and transmits information on the detected distortion signal with the first signal to the transmission unit. The transmission unit generates a predistortion signal using the information on the distortion signal and the first signal received from the reception unit, couples the generated predistortion signal with the transmission signal, and outputs the coupled signal.
Abstract:
PURPOSE: A location management system of a mobile sensor node and method thereof are provided to manage the location of a sensor node through a gateway which is connected with a sensor node. CONSTITUTION: A processing unit(123) writes out information about first to third gateways. The processing unit stores information about first to third gateways in database. A controlling unit(125) receives identification information of the sensor node from the first gateway. The controlling unit writes out first information about the sensor node through first gateway information which is extracted from database.
Abstract:
PURPOSE: A data-transmit-receiving apparatus and method are provided to transmit high-capacity data with high-speed by transmitting and receiving high-speed data to point to point communications using a millimeter wave band. CONSTITUTION: A network interface card module(210) creates a number gigabit grade serial bit stream by bundling gigabit Ethernet data which is transmitted and received from a plurality of internet networks(200). The network interface card module processes data by changing the number gigabit grade serial bit stream into Ethernet data. A baseband module(230) processes the data which is changed in the network interface card module in a baseband. An RF(Radio Frequency) module(260) processes the data which is processed at the baseband module in an RF band.
Abstract:
고이득을 위한 카세그레인 안테나를 개시한다. 카세그레인 안테나는 전파를 방사하는 급전부; 급전부의 방사면에 대향하도록 방사된 전파를 반사하는 부반사판; 부반사판에 대향하도록 서로 다른 깊이의 복수의 요철부들이 형성되어 부반사판에서 반사된 전파를 다시 반사하는 주반사판을 포함한다. 본 발명에 따르면, 제작단가가 낮은 고이득 광대역 안테나를 구현할 수 있다. 안테나, 카세그레인, 오프셋