Low-complexity time-domain channel estimation for OFDM systems

A low-complexity time-domain channel estimation scheme for orthogonal frequency division multiplexing (OFDM) is proposed in the presence of timing synchronisation error. It uses training symbols (preamble) to estimate the channel impulse response where the degradation caused by synchronisation error can be compensated for by an optimisation mechanism. The proposed scheme can be easily integrated with the existing near-ideal synchronisation technique. Simulation results in quasistatic channels show that the proposed method achieves near-ideal accuracy with a complexity much lower than that of the MMSE.