A Novel Double-Polarized SFBC-OFDM Scheme for ICI Suppression

MIMO-OFDM is widely considered as a promising framework of the future broadband mobile communication systems due to its prominent advantages such as high spectral efficiency, low-complexity equalization for multi-path fading, and sufficient exploiting of the spatial degree of freedom. However, an inherent drawback of OFDM, i.e., high sensitivity to frequency offset, limits the application scenarios of MIMO- OFDM significantly. This paper proposes an enhanced MIMO- OFDM scheme, termed double-polarized SFBC-OFDM (DP-SFBC-OFDM), which can improve the robustness to frequency offset with only very low complexity increase at the receiver. Simulation results show that even for very large frequency offset, the system only has limited performance degradation (e.g., normalized frequency offset of 0.4 only lead to performance loss of smaller than 1 dB for 64QAM for the proposed scheme while ordinary transmission scheme totally collapse in this case).