| 摘要 |
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.
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