Abstract:
PURPOSE: A device for controlling power by using small-sized base stations and a method thereof can automatically control power of an electronic product using a power device and power according to situations in which a user is by using small-sized base station technology. CONSTITUTION: A user detector (210) monitors whether a registration status of a user terminal served by a small-sized base station is completed, maintained, or cancelled. The user detector detects whether the user terminal exists or not. A control signal generator (220) generates a control signal controlling power for at least one power device among multiple power devices included in a certain group based on the result of the detection. A control signal projector (230) transmits the control signal to at least one power device among the multiple power devices. [Reference numerals] (110) Femto base station; (210) User detector; (220) Control signal generator; (230) Control signal projector; (AA) Control data
Abstract:
PURPOSE: A nonpowered heat dissipation device of a mobile device is provided to smoothly perform air circulation of an embedded heat sink by tilting the embedded heat sink, which is positioned on the bottom of the mobile device, without any separate electric power. CONSTITUTION: A nonpowered heat dissipation device of a mobile device includes a heat sink(102) which adheres to a circuit(100) in a mobile device; and a heat dissipation auxiliary unit(104) which is contacted with the circuit and the heat sink, and performs air circulation by being tilted by the volume expansion of a medium when the temperature in the mobile device rises. [Reference numerals] (100) Circuit; (102) Heat sink board; (104) Heat sink auxiliary unit; (110) Bottom
Abstract:
PURPOSE: An intelligent wireless communication system and a method for the same are provided to operate limited frequency resources by efficiently using time, space and frequencies. CONSTITUTION: An information collecting unit(910) collects the information on plural RATs(Radio Access Technologies) through the cooperation with the plural RATs. A channel allocation unit(920) allocates an optimized channel for each service by using the collected information. The channel allocation unit changes the allocated optimized channel in consideration of the movement speed of the terminal and the data transmission request speed of the terminal.
Abstract:
PURPOSE: A transmission spectrum sensing device is provided to transmit a transmission signal and to simultaneously sense frequency band which is used in the outside by applying an transmission signal elimination device in an RF reception terminal. CONSTITUTION: A digital RF(Radio Frequency) unit obtains transmission electric wave of a transmission unit brought into a reception unit through a duplexer(140) and external electric wave. An interference elimination part(132) uses a reference signal with a pattern same as the pattern of a signal included in the transmission electric wave in order to eliminate a transmission signal brought into the reception unit. A spectrum sensing unit(133) determines the frequency spectrum of the external wave brought into the reception unit. An FIR(Finite Impulse Response) filter extracts transmission electric wave of the transmission unit from a signal which is generated through down conversion of the transmission electric wave.
Abstract:
PURPOSE: A service providing method in a wireless communication system, and a method and an apparatus for resource allocation are provided to lower service charge of users by increasing frequency use efficiency and to enable new profit creation of a service provider. CONSTITUTION: A resource allocator(202) compartmentalizes service offered to user into any one of first and second services and preferentially assigns frequency channel capacity to a service classified into the first service. A wireless communication module(201) provides service data to a user terminal based on radio resource especially allocated by each service. The first service is the service providing the service data in a real time.
Abstract:
A method for managing information in a radio communication system is provided to search data information by using burst location information, thereby improving data transmission efficiency. System control information and data information are received from an RLC(Remote Link Control) layer(110) through a logical channel(150). The information is transmitted to a physical layer(130) after the received system control information and data information are mapped on a transmission channel(160). The data information is converted into a burst type of the physical layer. A radio frame recording the system control information and the converted data information is generated.
Abstract:
A terahertz wave generating device of high output, a manufacturing method thereof, and a near field electro spinning device are provided to increase an output of the terahertz wave by increasing a voltage applied to a photoconductive antenna based on a wide band gap material with a high breakdown voltage. A terahertz wave generating device of high output includes a semi-insulating substrate and a photoconductive antenna(120). The photoconductive antenna has an electrode pattern formed for applying the voltage to the upper part of the semi-insulating substrate and has an array shape by arranging a wide band gap material in the upper part of the electrode pattern in a row. A lens(110), the photoconductive antenna, and a power supply unit(130) are formed in the upper part of the semi-insulating substrate. A bias voltage is applied from the power supply unit to the photoconductive antenna. If a light wave of an ultraviolet range is injected by a semiconductor laser, the photoconductive antenna absorbs the light and generates the terahertz wave with high intensity.
Abstract:
본 발명은 에스디알(SDR) 기반의 모뎀 플랫폼 장치 및 운용 방법에 관한 것이다. 본 발명에 따른 SDR 기반의 모뎀 플랫폼 장치는, 무선 데이터를 송수신하는 RF 아날로그 모듈; RF 아날로그 모듈로부터 수신한 아날로그 신호를 디지털 형태의 데이터로 변환하는 ADC 모듈; ADC 모듈로부터 수신된 데이터를 데이터 모뎀 신호 처리하거나 상위 계층에서 수신된 데이터를 데이터 모뎀 신호 처리하기 위해서 데이터 전송 경로를 결정하는 단일의 FPGA 모듈; FPGA 모듈의 데이터 전송 경로에 따라 수신된 데이터를 데이터 모뎀 신호 처리하는 DSP 모듈; FPGA 모듈과 DSP 모듈을 제어하거나 DSP 모듈 및 FPGA 모듈과 데이터를 송수신하는 호스트 CPU 모듈; FPGA 모듈과 상위 계층과의 데이터 송수신을 처리하는 외부 인터페이스 모듈; 및 수신된 데이터를 아날로그 신호로 변환하여 RF 아날로그 모듈로 송신하는 DAC 모듈을 포함한다. 본 발명에 따르면, 디지털 통신 시스템의 구현에 있어서, 본 발명에서 제시한 방법으로 플랫폼을 구성할 경우, 하나의 공통된 하드웨어 플랫폼만으로 다양한 변복조 규격을 빠른 시간에 쉽게 구성할 수 있으므로, 개발 기간을 단축시키고, 최적의 성능 시험을 수행할 수 있도록 한 것이다. SDR, 모뎀 플랫폼, FPGA, DSP, ADC, DAC
Abstract:
A symbol synchronization apparatus and method for synchronizing symbol digitally is disclosed. In the present invention, digital symbols are generated by an A/D converting unit. Based on digital symbols, a symbol timing value is calculated. The symbol timing value is used for determining a best symbol timing. According to the best symbol timing, a clock phase is determined and A/D converting unit uses newly determined clock for generating digital symbols. As a result, the present invention can perform an over-sampling process in higher resolution than a sampling frequency by using only one A/D converter. Therefore, the present invention may increase economic efficient and reduce complexity of hardware.
Abstract:
PURPOSE: An apparatus and a method for synchronizing a digital symbol are provided to obtain the resolution of a narrower interval than an interval of sampling frequencies by using only one A/D converter. CONSTITUTION: An apparatus for synchronizing a digital symbol includes an A/D conversion portion(100), a symbol timing calculation portion(200), a timing decision portion(300), and an A/D clock supply portion(400). The A/D conversion portion performs an oversampling process for a received analog signal to a digital signal according to a clock. The symbol timing calculation portion calculates a symbol timing value from the oversampled signal in a sample interval. The timing decision portion decides the symbol timing from the symbol timing value. The A/D clock supply portion supplies an A/D clock to the A/D conversion portion according to the symbol timing information.