A channel estimation algorithm for MIMO-SCFDE systems over fast time-varying multipath channels

This paper considers a novel pilot-assisted channel estimation algorithm for multiple-input-multiple-output with single-carrier frequency-domain-equalization (MIMO-SCFDE) systems over fast time-varying multipath channels. Given that the fast time-varying channels can no longer support the assumption that the channel frequency-domain response remains invariant for the duration of one block, most of the channel estimation methods cannot be applied directly in it. We put forward a noise-eliminated minimum-mean-square-error channel estimation (MMSE-CE) algorithm for the channel estimation. The proposed pilot-assisted MMSE-CE method utilizes a novel polynomial interpolation method to obtain the interpolation vectors. Analysis and simulation results validate the improved performance of the proposed method in fast time-varying frequency-selective MIMO channel for both dense and sparse multipath channel environments.