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In this paper, we present a unique word (UW)-based channel estimationapproach for multiple-input multiple-output (MIMO) systems under doublydispersive channels, which is applied to orthogonal time frequency space (OTFS)with space time coding (STC). The OTFS modulation has been recently proposed asa robust technique under time varying channels due to its property of spreadingthe data symbols over time and frequency. Yet another relevant aspect is theemployment of multiple antennas at the transmitter and receiver. Therefore, weconsider an STC MIMO system with cyclic delay diversity at the transmitter andmaximum ratio combining at the receiver, where we develop a UW-based channelestimation scheme for multiple transmit antennas. We show a recently proposedframe optimization scheme for SISO is directly applicable to MIMO. In addition,we evaluate numerically the frame error rate (FER) of OTFS and OFDM with 2x2and 4x4 MIMO, where the time varying channel is estimated using the UW-basedapproach. The FER results reveal that OTFS becomes more advantageous than OFDMfor MIMO-STC systems with higher order modulation and code rate.

Channel Estimation for MIMO Space Time Coded OTFS under Doubly Selective Channels