MIMO-OFDM residual timing offset correction using subspace method

Multiple transmit and receive antennas can be used in orthogonal frequency division multiplexing (OFDM) systems to improve communication quality and capacity. But the MIMO-OFDM system is very sensitive to synchronization errors. Due to the presence of Gaussian noise, channel distortions and implementation losses of synchronization, residual timing offsets always exist for an OFDM receiver. In this paper, we first analyse the reception process of OFDM system. Then we present a technique to correct the residual timing offset. An advantage of this correction method is that it does not need to add any additional information to transform. As shown in the simulation result, this method can achieve a very good result even the residual timing offset is very big.