Joint Interference Suppression for Multi-User TDD MIMO Downlink with Other-Cell Interference

Abstract

In multiuser TDD MIMO downlink communications, system performance suffers from multiuser interference(MUI) and other-cell interference(OCI). This paper proposes designing a precoder to jointly suppress MUI and OCI. Firstly, a precoding matrix is designed for multiuser interference suppression, with the help of the QR decomposition of generalized MMSE channel inversion. And then, using a signal leakage criterion, the second precoding matrix is designed to suppress OCI and residual MUI. The proposed algorithm can avoid user feedback in multiuser TDD MIMO systems. Simulation results demonstrate the effectiveness of the proposed scheme.