WLC43-3: A New Joint Time Synchronization and Channel Estimation Scheme for MIMO-OFDM Systems

In this paper, we extend a training sequence structure, which was originally designed for orthogonal frequency division multiplexing (OFDM) systems, into multiple-input multiple-output (MIMO) scenario. Unlike conventional training sequence structures for MIMO-OFDM systems, the proposed modification eliminates the interference among training sequences transmitted by different antennas, and can be constructed from the same orthogonal sequence. Furthermore, the unique structure enables a low-complexity joint time synchronization and channel estimation scheme that requires only a correlator and a comparator. With the same training sequence length, computer simulation results show that the proposed joint scheme outperforms conventional synchronization and channel estimation methods by orders in MIMO-OFDM systems.