Joint channel estimation and equalization for MIMO-SCFDE systems over doubly selective channels

This paper considers a novel joint channel estimation and equalization (JCEE) algorithm for multiple-input-multiple-output single-carrier frequency-domain-equalization (MIMO-SCFDE) system over doubly selective channels for the first time. Given that the doubly selective 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. And the lack of the information interaction between channel estimation and channel equalization degrades the overall performance. We put forward a noise-eliminated minimum-mean-square-error channel estimation (MMSE-CE) algorithm for the initialization, which is then utilized for iterative processing using the ordered successive interference cancellation (OSIC) technique. Analysis and simulation results validate the improved performance of the proposed JCEE algorithm for MIMO-SCFDE systems over doubly selective channels.