Frequency offset estimation method in ofdm system and ofdm receiver using the same

A method of estimating a frequency offset based on a training symbol in a receiver of an orthogonal frequency division multiplexing (OFDM) system, the method comprising:

• receiving a first training symbol having a periodicity and a predetermined second training symbol;
• calculating a first correlation value for the first training symbol and a second correlation value for the second training symbol based on a coherence phase bandwidth (CPB);
• determining a position of a peak value from the first correlation value for an integer multiple frequency offset candidate based on a threshold value;
• and
• estimating a position corresponding to a maximum value of the second correlation value as the frequency offset based on of the position of the peak value.

An orthogonal frequency division multiplexing (OFDM) receiver configured to estimate a frequency offset based on a training symbol, the OFDM receiver comprising:

• an RF unit configured to receive a first training symbol having a periodicity and a predetermined second training symbol;
• and
• a frequency offset processor configured to
• calculate a correlation value for the first training symbol based on a coherence phase bandwidth (CPB),
• determine a position of a peak value from the correlation value of an integer multiple frequency offset candidate based on a threshold value,
• calculate a correlation value for the second training symbol based on the CPB, and
• estimate a position corresponding to a maximum value of the correlation value calculated for the second training symbol as the frequency offset based on the position of the peak value.