Patent ID: 8300621

Claim:
A timing acquisition apparatus that calculates frame timing by using an orthogonal frequency division multiplexing (OFDM) symbol input to a terminal of an OFDM system, the timing acquisition apparatus comprising: a delay signal generator, comprising: a first tab shift register for storing the input OFDM symbol; a delay generator for delaying the input OFDM symbol from the first tab shift register by a length of a repeating pattern of input the OFDM symbol to generate a second OFDM symbol, wherein the input OFDM symbol and the second OFDM symbol are conjugate complex symmetric; and a second tab shift register for storing the second OFDM symbol; an operation unit for calculating an observation value resulting from auto-correlation of the input OFDM symbol from the first tab shift register and the second OFDM symbol from the second tab shift register; and a peak value checking device for calculating the frame timing by checking a peak point of an absolute value of the observation value.