METHOD AND DEVICE FOR DFT-BASED CHANNEL ESTIMATION IN A MIMO-OFDM SYSTEM WITH PILOT SUBCARRIERS

摘要

The present invention relates to a DFT-based channel estimation method and apparatus therefor in a MIMO-OFDM system having a pilot subcarrier, wherein the channel estimation method comprises: (a) an even number from received OFDM signals; Pilot subcarrier () Extracting c); (b) Performing a linear minimum mean square error (LMMSE) estimation in the frequency domain with respect to the extracted pilot subcarriers, ) Pilot subchannel estimate ( Obtaining; (c) the pilot subchannel estimation value ( ) Is inverse discrete Fourier transform (IDFT) to impulse response ( Obtaining; (d) performing amplitude adjustments to reduce noise effects on the impulse response of the time domain; (e) the amplitude adjusted impulse response ( Inserting 0 corresponding to the number difference between the total subcarriers and the extracted pilot subcarriers); (f) an impulse response with the zero inserted above ( ) By discrete Fourier transform (DFT) to the frequency domain. At this time, the MIMO-OFDM system is Each transmit antenna ( , Pilot symbol () , , The number of pilot subcarriers) is a non-zero value, and pilot symbols between different transmit antennas are orthogonal to each other.;OFDM, MIMO, Channel Estimation, LMMSE, Discrete Fourier Transform, DFT, Zero Padding