Impacts of high mobility on post-processing SINR estimation for MIMO-OFDM transmissions

This paper investigates the impacts of high mobility on the post-processing signal-to-interference-plus-noise ratio (SINR) for multiple-input-multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) transmissions, which takes the joint effects of inter-carrier interference (ICI) caused by doppler shift and outdated channel state information (CSI) due to the channel fast fading into consideration. The post-processing SINR on each resource unit (RU) and resource block (RB) is formulated, which can be used as the input to system-level simulation for system throughput prediction and performance analysis of MIMO-OFDM under high mobility scenario. Both link-level and system-level simulations are conducted to show the performance degradation caused by the user high mobility. Moreover, the optimal pilot insertion interval in time domain in terms of the user throughput under high mobility scenario is also discussed.