A MIMO-OFDM technique for high-speed mobile channels

In this paper, a new orthogonal frequency-division multiplexing (OFDM) technique for multiple-input multiple-output (MIMO) channels is proposed to reduce interchannel interference (ICI) caused by high-speed mobiles in cellular environments. After a closed-form of bit error rate (BER) is derived for MIMO-OFDM systems, the ICI caused by high-speed mobile channels is analyzed using a simple curve fitting technique. Then, a new MIMO-OFDM technique, based on the result of the leakage pattern of ICI in the frequency-domain is proposed for reducing ICI caused by time-varying channels. Performances of the proposed technique are verified by using the I-METRA channel, proposed for a MIMO channel to 3GPP, and a MIMO-OFDM simulator designed for macrocellular mobile communication. It is shown by computer simulation that the proposed MIMO-OFDM technique is effective in reducing ICI and noise as well as in obtaining diversity gain even under highly-correlated fast fading channels, compared with the conventional MIMO-OFDM schemes.