Abstract:
PURPOSE: A device for reducing noise in a DC power supply is provided to prevent an error occurrence due to a spur component in a spectrum sensing receiver, and to improve a signal to noise ratio of a transceiver by removing a direct current noise of an SMPS(Switching Mode Power Supplier) by using a circuit for eliminating noise. CONSTITUTION: A device for reducing noise in DC power supply comprises a ferrit bead(41) removing after converting a noise included in a DC voltage inputted from an SMPS into heat; and a low frequency filter(43) removing a low frequency noise of the DC voltage by having an inductor and a capacitor.
Abstract:
PURPOSE: A communication device including a spectrum sensing antenna and a data transceiving antenna in a cognitive radio communication system and an antenna switching method in the communication device are provided to select an optimal antenna from antennas according to the quality of a currently performing channel. CONSTITUTION: A quality measuring unit(851) measures information related to the quality of a channel different from a channel between a communication device and another communication device based on data received from the communication device through a primary antenna or a secondary antenna. A determining unit(852) determines whether the channel has a better state than another channel based on the measured information. If the state of the channel is not better than another channel based on the determined result, a control unit(853) controls a switch to mutually change connection targets of the primary antenna and the secondary antenna. [Reference numerals] (810) Primary antenna; (820) Secondary antenna; (830) Data transceiver; (840) Spectrum generator; (850) Switching processor; (851) Quality measuring unit; (852) Determining unit; (853) Control unit;
Abstract:
본 발명은 단일 캐리어 주파수 분할 다중접속 방식을 이용하는 이동통신시스템에 다중안테나를 적용하는 기술에 관한 것이다. 본 발명은 변조된 심볼을 복수의 레이어에 맵핑하는 레이어 맵퍼, 상기 각 레이어에 맵핑된 심볼을 복수의 시간 영역 스트림에 균등하게 분할 혼합하는 레이어 쉬프터 및 상기 복수의 시간 영역 스트림을 각각 이산 푸리에 변환(DFT: Discrete Fourier Transform)변환하여 복수의 주파수 영역 스트림을 생성하고, 상기 각 주파수 영역 스트림에 상응하는 안테나를 이용하여 상기 주파수 영역 스트림을 수신 장치로 전송하는 신호 전송부 및 이에 상응하는 수신부를 포함하는 것을 특징으로 하는 전송 장치를 제공한다. 단일 캐리어 주파수 분할 다중 접속, SC-FDMA, OFDM, PAPR
Abstract:
무선 통신 시스템에서 전송모드를 스위칭하는 하이브리드 전송 방법을 제안한다. 본 발명의 실시예에 따른 무선 통신 시스템의 기지국에서 전송모드를 스위칭하는 하이브리드 전송 방법은, 셀 내의 단말기들 각각의 단말기 상태를 확인하는 단계; 상기 단말기 상태에 따라 상기 단말기 별로 전송모드를 설정하는 단계; 설정한 상기 전송모드를 상기 단말기들로 제공하는 단계; 및 상기 단말기들과 설정한 상기 전송모드로 통신하는 단계를 포함한다. 하이브리드 전송, 전송모드, SC-FDMA, 다중 SC-FDMA, OFDMA
Abstract:
PURPOSE: Carrier aggregation in a wireless communication system is provided to allocate wireless resources using the corresponding relation between a downlink and an uplink, thereby transmitting data using an allocated wireless resource. CONSTITUTION: A receiving unit(910) receives control information and data using a plurality of downlink carrier components. The receiving unit receives scheduling information about the data using a primary carrier component. A controller(920) determines an uplink channel element included in the uplink carrier component. A transmission unit(930) transmits receiving checking information about the data to the base station using the determined uplink channel element.
Abstract:
PURPOSE: A transmitting method and base station determining the same are provided to transceive an uplink signal in a wireless communication system. CONSTITUTION: A terminal information confirming unit(212) confirms information about the transmission power of a terminal. The terminal determines a first mode in case there is no restriction for transmission power. The terminal determines a second mode in case there is restriction for transmission power. A mode determining unit(214) transmits mode information to the terminal. A first mode transmits L1/L2 control information through a PUCCH(Physical Uplink Control Channel).
Abstract:
PURPOSE: A method for transmitting ACK/NACK information with an UL physical control channel is provided to transmit ACK/NACK information about DL data using an UL CC(Component Carrier). CONSTITUTION: A UE(User Equipment) receives DL data from a BS(Base Station), determines whether the transmission of the DL data succeeds, and creates information about whether the transmission of the DL data succeeds(510). The UE receives information about available radio resources from the BS(520). The UE creates a plurality of radio resource groups(530). The UE selects radio resources out of the radio resource group(540). The UE transmits transmission confirmation information to the BS(550).
Abstract:
본 명세서는, 다중 사용자 전력 할당 방법이 개시된다. 다중 사용자 전력 할당 방법은 통신시스템에서, 중첩코딩을 이용한 다중 전송을 위해 사용자 단말 각각의 요구조건을 만족하도록 사용자 단말 별로 전력을 할당하는 것을 특징으로 한다. 다중 전송, 중첩코딩, 오름차순, 오버레이(overlay), 내림차순, 언더레이(underlay), 전력 분할, 전력 할당
Abstract:
PURPOSE: A multiple antenna for a single carrier frequency division multiple access system is provided to improve system performance of a single carrier frequency division multiplexing access system by implementing efficient spatial multiplexing. CONSTITUTION: In a multiple antenna for a single carrier frequency division multiple access system, layer mappers(140,141) map a modulation symbol included in a coding word to at least layer. Layer shifters(150,151) divide the modulation symbol mapped in each layer in a plurality of time domain streams equally. Signal transmission parts(160,161) produce a single carrier frequency multiplex connection signal based on the plural time domain streams. A signal transmission part transmits the single carrier frequency multiplex connection signal to a receiving device by using a plurality of antennas. The layer shifter changes a order or a phase of the modulation symbol mapped in each layer.
Abstract:
A base station and a terminal using a space-time block coding and circulation delay diversity in an OFDMA(Orthogonal Frequency Division Multiple Access) system are provided to receive data efficiently by considering a frequency selection characteristic about an individual user terminal. A diversity determining unit(110) determines the suitable send diversity plan in each of the user terminal according to frequency selective characteristics of the channel about each mobile terminal. A diversity instructing unit(120) indicates the determined transmission diversity plan to each user terminal. A data receiver(130) receives the send diversity plan from the user terminal.