An MIMO-OFDM technique for high-speed mobile channels

초록

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, new MIMO-OFDM techniques, based on the result of analysis about the leakage pattern of ICI in the frequency-domain, are proposed for reducing ICI caused by time-varying channels. Performances of the proposed techniques are verified by using the I-METRA channel, proposed for an MIMO Channel to 3GPP, and an MIMO-OFDM simulator designed for macrocelluar mobile communication, satisfying all the requirements for the systems beyond IMT-2000. It is shown by computer simulation that the proposed MIMO-OFDM techniques are 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.