An enhanced interference mitigation scheme in the presence of asynchronous Inter-Cell Interference for MIMO-OFDMA

To mitigate the asynchronous ICI (inter-cell interference), the CFR (channel frequency response) and SCM (spatial covariance matrix) should be accurately estimated. Therefore, the enhanced asynchronous ICI mitigation scheme which can effectively reduce the estimation error of both CFR and SCM, and improve performance for MIMO (multiple-input multiple-output)-OFDMA (orthogonal frequency division multiple access) system is derived. In particular, the lower-bound performance is approached to within 1 dB, by using the proposed method for both MMSE (minimum mean square error) and ML (maximum likelihood) receiver in the presence of asynchronous ICI.