Abstract:
본 발명은 OFDM 셀 탐색 및 BCH 복조 방법에 관한 것으로, 무선통신 시스템에서 순방향 동기신호를 이용한 셀 탐색 방법에 있어서, (a)단말이 수신한 프레임에 포함된 1차 동기채널 심볼을 이용하여 싱크블록 동기 및 1차 동기채널 시퀀스 번호를 획득하는 단계, (b)상기 싱크블록 동기 및 상기 단말이 수신한 프레임에 포함된 2차 동기채널 심볼을 이용하여 상기 프레임의 경계 및 스크램블링 코드 그룹을 검출하는 단계, (c)상기 1차 동기채널 시퀀스 번호 및 상기 스크램블링 코드 그룹을 이용하여 스크램블링 코드를 획득하는 단계 및 (d)상기 스크램블링 코드를 이용하여 상기 단말이 수신한 프레임에 포함된 BCH를 복조하여 무선통신 시스템 정보를 획득하는 단계를 포함하며, BCH를 복조하기 전에 동기채널을 이용하여 BCH의 TTI 경계를 획득할 수 있기 때문에 BCH 디코딩시 time ambiguity에 의한 blind detection을 할 필요가 없게 되어 수신기 구조가 간단해진다. OFDM, 동기채널, 셀 탐색, BCH
Abstract:
Disclosed is a position determining method for a terminal in a communication system using multi-beams. An operation method of the terminal in accordance with the present invention comprises a step of receiving a first beam from a first point; a step of receiving a second beam from a second point; and a step of determining the position of the terminal by using information on the first beam and the second beam. The position determining method enables the system using the multi-beams to determine the position of the terminal by using the angle of the beam and beam start and/or final coordinate information without a positioning device such as a GPS when receiving two or more valid beams.
Abstract:
Disclosed are a method for receiving downlink data and a machine-to-machine device using the same. A machine-to-machine device according to the present invention includes a plurality of antennas, receives a down link reference signal for each antenna from a base station, estimates the received signal quality for the downlink reference signal for each antenna, and includes a received signal process module selecting an antenna to receive a downlink signal according to the received signal quality for each antenna. [Reference numerals] (310) RF transceiver; (320) A/D converter; (330) Baseband processor; (340) Antenna controller; (AA) Received signal quality
Abstract:
A data transceiving method between a narrow-band device and a broadband device and a communication device using the same are disclosed. The data transceiving method for a machine-to-machine service comprises a step of setting a band applied to a base station for the base station within a frequency band supported by the base station; and a step of transceiving data to the base station through the frequency band. Therefore, the present invention enables efficient data transmission between a base station supporting a broadband and a machine-to-machine supporting a narrow-band using a frequency band applied to the base station and the machine-to-machine device. [Reference numerals] (AA) Start; (BB) No; (CC) Yes; (DD) End; (S201) Specific information exists?; (S202) Set a frequency band based on the specific information; (S203) Receive band information from a base station; (S204) Set the frequency band based on the band information; (S210) Transceive data through the set frequency band
Abstract:
무선통신 환경에서 채널 지연에 따른 간섭 제거 방법 및 그 장치가 개시된다. 본 발명의 일 실시예에 따른 간섭 제거 방법은 주파수 도메인에서의 채널 특성 및 잡음 특성을 반영한 문턱값을 설정하는 단계, 설정된 문턱값 이상의 채널을 갖는 데이터 심볼을 선택하고 이를 피드백 회로를 통해 피드백하여 중첩된 이중 윈도우 구조를 갖는 심볼을 생성하는 단계 및 생성된 이중 윈도우를 합성하여 신호 대 간섭비의 이득을 획득하는 단계를 포함한다.
Abstract:
PURPOSE: A signal receiving method for cancelling interference due to channel delay in a wireless communication environment and device thereof are provided to cancel interference due to channel delay in a wireless communication environment. CONSTITUTION: A receiving device cancels interference of adjacent symbols about a current symbol through an interference cancelling unit(400). The receiving device circularly expands a symbol through a circulation construction unit(410). A window separating unit(420) configures an OFDM symbol by two overlapped windows of a previous window and a next window. An FFT(Fast Fourier Transform) unit(430) performs fast Fourier transformation in separated windows. An FDE(Frequency Domain Equalizer) unit(440) equalizes a channel. A window combining unit(450) combines separated OFDM symbols. An LLR calculating unit(460) calculates the log-likelihood ratio configuring a symbol. The symbol is decoded by a decoder(470).