Performance comparison of LS, LMMSE channel estimation method in frequency and time domain for OQAM/OFDM systems

In this paper, we first compare least square (LS) and linear minimum mean square error (LMMSE) channel estimation method with frequency and time domain in offset quadrature amplitude modulation/orthogonal frequency division multiplexing (OQAM/OFDM) systems. We proposed an iterative LMMSE channel estimation in time domain which needn't a priori knowledge for the channel. Simulation results demonstrate that the time domain methods improve the channel estimation performance compare to the frequency domain methods. Moreover, simulation results show that the proposed method has an approximate performance with the conventional LMMSE method.