Patent ID: 7778338

Claim:
A method for estimating a timing error and a frequency offset based on a received signal in an OFDM MIMO system, the method comprising: a) processing signals received through a plurality of antennas to generate OFDM symbols, and extracting a preamble symbol from the OFDM symbol wherein a PN sequence is multiplied to the preamble symbol of the OFDM symbol and the OFDM symbol and the PN sequence are multiplied with each other after a predetermined delay at a transmitting side; b) generating a local PN sequence which corresponds to the PN sequence, delaying the local PN sequence for a predetermined value and multiplying the extracted preamble symbol by the local PN sequence; c) estimating a timing error based on the amplitude of a corresponding signal that is generated by multiplying the extracted preamble symbol by the local PN sequence, and compensating the timing error; and d) estimating a frequency offset based on the preamble symbol to which the local PN sequence is multiplied, and compensating the frequency offset.