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In LTE downlink Multiple-Input Multiple-Output (MIMO), Eigen Based Beamforming (EBB) is a promising approach for single-user scenario, while Block Diagonalization Based Beamforming (BDBF) eliminates intra-cell interferences significantly for multi-user scenario. However, both of them neglect inter-cell interferences which may lead system performance degradation. This paper presents an Interference Suppression Based Beamforming (ISBF) scheme to suppress inter-cell interferences. The authors first introduce Interference Suppression Matrix (ISM) into EBB and BDBF to propose a novel beamforming matrix construction method.
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