Low complexity time-domain channel estimation for OFDM using training symbols

Abstract

A low complexity time domain channel estimation technique for OFDM systems is proposed. It uses training symbols to estimate the channel impulse responses (CIR) via circular cross-correlation. A CIR search window technique is also proposed to optimise the accuracy of synchronisation and channel estimation. The output of the search window can also be used for the estimation of channel delay spread. Simulation results show that the proposed method provides near-ideal accuracy with a complexity much lower than the MMSE technique.