Inter-carrier interference mitigation based on precoder design

In view of the inter-carrier interference (ICI) coefficients characteristic caused by the normalized frequency offset in orthogonal frequency division multiplexing (OFDM) systems, a general precoder design scheme was proposed for OFDM mobile systems. The linear precoder at transmitter could make the ICI coefficient to be concentrated on a few subcarriers and be set zero at other subcarriers. The interference matrix at receiver would be replaced by a sparse matrix, and signal detection could be simplified. Both theoretical analysis and simulation results were presented for the proposed scheme. Compared with existing mitigation ICI schemes with equalization, the proposed scheme has lower computational complexity, and compared with self-cancellation scheme, the bandwidth efficiency is improved.