Abstract: “n this paper, we proposes a modified OFDM, CPD-OFDM (Orthogonal Frequency Division Multiplexing with cross polarization diversity structure), system combating the system performance degradation due to the frequency offset. The cross polarization diversity structure composed with 2-pairs cross polarized circular antenna in each transceiver has the characteristic that it can remarkably remove the odd time reflected waves in each receiving end. The cross circular polarization diversity structure can reduce the time delay spread and ICI. Therefore, the proposed CPD-OFDM system can improve the system performance as well as the spectrum efficiency. In order to investigate the performance improvement of OFDM system due to the frequency offset, computer simulation and theoretical analysis were conducted. From this analysis, it can be seen that the CPD-OFDM system performance has been improved by 1～3 [dB] compared to that of the conventional OFDM system.”

Keywords: frequency offset, removing delayed waves, cross polarization diversity structure, system performance improvement