Adaptive Decision Feedback Channel Estimation Using Terminal Speed for SC-FDE MIMO

This study proposes an adaptive decision feedback channel estimation (DFCE) scheme for single-carrier with frequency domain equalization (SC-FDE) multiple-input multiple-output (MIMO). The feature of the proposed approach is to control the forgetting factor sensitive to channel variation by using the terminal speed and to detect the actual channel condition based on the decision output of coded SC-FDE MIMO. Moreover, considering that SC signals generally have a significant envelope variation in the frequency spectrum, only the subchannel signals with large magnitudes are utilized for DFCE, which leads to noise enhancement suppression. The effectiveness of the proposed scheme is demonstrated in comparison with the traditional channel estimation scheme without DFCE through computer simulations.