Channel Estimation in Spatially Correlated High Mobility MIMO-OFDM Systems

MIMO-OFDM is a transmission method very sensitive to the channel time-variations arising in high mobility scenarios due to the appearance of inter-carrier interference (ICI). In this paper we propose an algorithm for channel estimation in MIMO-OFDM systems that uses a Basis Expansion Model that exploits temporal, frequency and spatial correlations within the wireless channel in high mobility scenarios. The advantage of the proposed approach is that it does not require a specific pilot subcarrier structure to estimate the ICI and is suitable for its implementation in currently standardized MIMO-OFDM radio interfaces.