Mitigation of Intercarrier Interference Based on General Precoder Design in OFDM Systems

For orthogonal frequency division multiplexing (OFDM) communication systems, the frequency offset in mobile radio channels distort the orthogonality between sub-carriers, which results in intercarrier interference (ICI) and seriously degrades the performance of systems. In this paper, based on ICI coefficients analysis, a novel precoder design scheme is proposed for mitigation ICI in OFDM mobile systems. In this technique, precoder matrix is designed by linear counteraction and inserted in transmitter. Computer simulation results show that this new scheme can effectively reduce ICI and significantly improve the carrier-interference power ratio. Compared with existing ICI mitigation schemes with channel estimation, the proposed scheme has lower computational complexity, and compared with self-cancellation scheme, the bandwidth efficiency can be improved. The proposed scheme has also better convergence stability for time-varying frequency selective fading channel.