A method for detecting initial signal of Multi carrier receive system and apparatus for performing said method

PURPOSE: A method for detecting an initial signal of a multi-carrier receiving system and a detecting apparatus for performing the same are provided to perform a signal sensing process, an automatic gain control process, and a symbol synchronization detection process within a short time when receiving a multi carrier signal through a common communication medium, such as a power line. CONSTITUTION: The signal sensing process(S2-S40) is to calculate intensity and a correlation value of received signal in time domain, to compare them to a reference value, and to determine whether the signal is received or not according to the above result. The automatic gain control process(S50-S75) is to compare the reference value to the intensity of the symbol power of the received signal, and output an automatic gain control signal to control a setup level of the received signal. The symbol synchronization detection process(S80-S110) is to decide the symbol synchronization by the minimum value of the correlation of the symbol period, and output a synchronous signal according to the decided symbol synchronization. 본 발명은 다중 반송파 수신 시스템의 초기신호 검출방법 및 이를 수행하기 위한 장치에 관한 것으로, 시간영역에서의 수신신호의 크기와 자기상관치 및 상호상관치를 각각 구해 신호감지를 하고 시간영역에서 수신신호의 크기를 기준값과 비교하여 자동이득제어를 수행하며 심볼 주기의 자기상관치가 최소값인 지점을 찾아 심볼동기를 수행하도록 구성된 것으로, 전력선과 같은 공유 통신매체에서 다중반송파 수신신호에 대해 신속하게 신호감지, 자동이득제어, 심볼동기를 수행할 수 있다.