An investigation into time-domain approach for OFDM channel estimation

A time-domain based channel estimation for OFDM system with pilot-data mult iplexed scheme is investigated. As an approximation to linear minimum mean square estimator (LMMSE), a time-domain based channel estimation is propose d where intra-symbol time-averaging and most significant channel taps selec tion are applied. The relation and differences of the proposed method to DF T-based LMMSE methods are discussed. The performances of the proposed metho d, DFT-based LMMSE method [15] and the methods of [16] and [17] are evaluat ed in multipath fading channels. The simulation results show that proposed method achieves almost the same performance as DFT-based LMMSE method and b etter BER performance than the other methods while keeping less complexity.