In order to suppress the imaginary intrinsic part interference of OFDM/OQAM system in radio channel, a new pilot design approach is proposed. The new design approach can suppress the intrinsic imaginary interference in quasi-stationary channel and reduce the pilot peak power due to sparse data forms. This paper analyzes the reason why the imaginary intrinsic interference produces in the PLC (power line communication) channel and the new pilot eliminates the imaginary intrinsic interference. Compared with the pilot design of OFDM/CP,OFDM/OQAM system, it is verified that the new pilot design approach is better than OFDM/CP ,IAM-R,IAM-I and almost the same as IAM-new under MATLAB simulation platform in the PLC channel with the same channel estimation and equalization mode.

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OFDM system is widely used in mobile communication because of its high spectral efficiency and strong anti-multipath capability. However, in high dynamic scenarios, the Doppler shift between the transmitter and the receiver destroys the orthogonality between the sub-carriers, resulting the interference between the sub-carriers and distortion of the signal, which greatly degrades the system performance. In this paper, a mathematical model of Offset-OFDM system was established and the Doppler response formula of OFDM system in high white channel was derived. Furthermore, we investigated the factors that influence the performance of OFDM. This study laid the foundation for determining OFDM system parameters in high dynamic scenarios.