Iterative Receiver for Mobile MIMO-OFDM Systems Using ICI-Aware List-Update MIMO Detection

In mobile multiple-input multiple-output (MIMO) - orthogonal frequency division multiplexing (OFDM) communication systems, inter-carrier interference (ICI) and inter-antenna interference (IAI) are two crucial factors that can significantly affect detection performance. Conventionally, ICI and IAI are handled sequentially by ICI mitigation and MIMO detection. This paper proposes a novel iterative receiver where soft information, computed from a list of MIMO symbol vectors and associated ICI assumptions, is interchanged between the "ICI-aware" list-update MIMO detector and a forward error correction (FEC) decoder. Furthermore, by exploiting the difference between tentative ICI-inducing symbol vectors, we propose a low-complexity delta-ICI method for list update. Simulation results show that the proposed iterative MIMO-OFDM receiver in high-mobility channels can achieve similar detection performance as that of a MIMO-OFDM receiver in stationary (ICI-free) channels.