Method and apparatus for estimating timing error and frequency offset of mimo system

A device for estimating a timing error and a frequency offset based on a received signal in an OFDM MIMO system for transmitting and receiving the signal through a plurality of transmit antennas and a plurality of receive antennas, the device comprising:

• a plurality of preamble extractors, formed to correspond to a receive antenna, for extracting a preamble symbol from an OFDM symbol for the signal received through the corresponding receive antenna wherein a PN sequence delayed by a predetermined value is multiplied to the preamble symbol of the OFDM symbols of the signals received through a first antenna from among receive antennas;
• a local PN generator for generating a local PN sequence that corresponds to the PN sequence and is shifted by a predetermined value;
• a multiplier, formed to correspond to a preamble extractor, for delaying the local PN sequence by a predetermined value and transmitting the delayed local PN sequence to the extracted preamble symbol;
• a timing error estimator and compensator for estimating and compensating a timing error based on the correlation of the PN sequence of the preamble symbol and the local PN sequence;
• and
• a frequency offset estimator and compensator for estimating and compensating a frequency offset based on the preamble symbol to which the local PN sequence is multiplied.