Abstract:
A method for estimating frequency offset in a digital broadcasting system estimates frequency offset by using start of frame (SOF) symbols forming a header of a received physical layer frame and physical layer signalling code (PLSC) symbols for providing a modulation mode and code rate information. [Reference numerals] (410) Receiving unit; (420) Approximate frequency estimation unit; (430) Decoding unit; (440) Fine frequency estimation unit
Abstract:
양방향위성통신시스템에서의위성통신장치간의망동기획득을위한망클럭참조패킷을생성하는장치가제공된다. 상기망클럭참조패킷생성장치는, 제1 프레임의프레임시작점(Start of Frame)에대한트리거신호에기초하여망클럭참조값(NCR)을결정하는클럭참조값결정부와, 상기제1 프레임부터망클럭참조패킷이삽입되는제2 프레임까지의프레임가변길이정보를반영하여동기보상값을결정하는동기보상부, 및상기망클럭참조값과상기동기보상값을결합하여상기망클럭참조패킷을생성하는패킷생성부를포함할수 있다.
Abstract:
PURPOSE: An apparatus for estimating the DOA(Direction Of Arrival) and TOA(Time Of Arrival) of a mobile signal and a method thereof are provided to separate a received signal in order to reduce the complexity and to estimate the DOA and TOA of the mobile signal having low complexity using a pseudo-spectrum calculation which uses DFT(Discrete Fourier Transform). CONSTITUTION: A separating unit(210) separates a received signal into DOA vectors and TOA vectors. A correlation matrix calculation unit(220) calculates the correlation matrix of the DOA and the correlation matrix of the TOA. An Eigen Vector Decomposition(EVD)(230) receives the correlation matrix of the DOA and TOA and checks the number of paths through which the received signal is received. A spectrum calculation unit(240) calculates a pseudo-spectrum using DFT. A total calculation unit(250) calculates a TOA spectrum. A sensing unit(260) senses the discrete spatial frequency of the DOA when having a maximum DOA spectrum value and the discrete spatial frequency of the TOA having a maximum TOA spectrum value. A mapping unit(270) calculates the corresponding DOA and TOA. [Reference numerals] (210) Separating unit; (220) Correlation matrix calculation unit; (230) Eigenvector analysis unit; (240) Spectrum calculation unit; (260) Sensing unit; (270) Mapping unit;
Abstract:
본 발명의 실시예는 고속 신호 처리를 위한 DAC 장치들 사이의 동기화 방법과 그 시스템에 관한 것이다. 다중 DAC 장치의 동기화 방법에 있어서, MUX DAC 장치에 클럭을 입력하는 단계; 클럭을 제1 클럭과 제2 클럭으로 나누는 단계; 제1 클럭과 제2 클럭 사이의 위상 차이를 D 플립플롭으로 전달하는 단계; 및 위상 차이를 처리하여 제1 클럭과 제2 클럭을 동기화하는 단계를 포함하는 다중 DAC 장치의 동기화 방법이 제공될 수 있다.