A Simplified Wiener-Based SIC ICI Cancellation Scheme for OFDM Systems over Time-Varying Channels

The sub carriers of orthogonal frequency division multiplexing (OFDM) systems may fail to keep orthogonal to each other under time-varying channels. The loss of orthogonality between the sub carriers will degrade the system performance, and this effect is named inter carrier interference (ICI). A Wiener-based successive interference cancellation (SIC) scheme has been proposed to detect the OFDM signals. It provides good ICI cancellation performance, however, it suffers large computation complexity. In this paper, a modified Wiener-based SIC scheme is proposed to reduce the computation complexity. Simulation results show that the performance of the modified Wiener-based SIC scheme has little degradation as compared to Wiener-based SIC scheme, while its computation complexity can be dramatically reduced.