Patent ID: 7194055

Claim:
A frame synchronization device, which receives a received signal that includes a preamble of repeating synchronization symbols, and a data frame following the preamble, the frame synchronization device comprising: a first correlation unit configured to repeatedly generate a synchronization symbol, and correlate between the generated synchronization symbols and the received signal to form a first correlation signal; a second correlation unit configured to delay the received signal by a time corresponding to a length of the synchronization symbols to form a delay signal, and correlate between the delay signal and the received signal to form a second correlation signal; a preamble detector configured to detect a preamble period based on the second correlation signal, and to output a period specifying signal; and a generator configured to detect a start time point of the data frame based on the period specifying signal and the first correlation signal, and to generate a frame synchronize signal at substantially the same time of the detection, wherein the preamble detector detects a time interval, which is obtained during the second correlation signal, is above a threshold level as the preamble period.