Pilot Design and Channel Estimation in MIMO-OFDM System with Two Transmit Antennas

A novel pilot design scheme and simple channel estimation algorithm for an orthogonal frequency-division multiplexing (OFDM) system with two transmit antennas is proposed in this paper. The proposed algorithm takes advantage of the essence of SFBC to reduce the interantenna interference. In the proposed channel estimation scheme, the pilot sequences for two transmit antennas are carefully designed to reduce the interantenna interference, which will lead to more accurate channel estimation. And the interantenna interference at the receiver is used to further improve the performance of the channel estimation. The mean square error (MSE) for the proposed algorithm is formulated and the computational complexity is also analyzed. Computer simulations are conducted to verify the effectiveness of the algorithm. The simulation results show that the MSE accords with theoretical analysis and the loss in BER performance due to the proposed channel estimation are negligible compared to that with perfect channel state information (CSI) case.