Codebook selected beamforming algorithm for multiuser MIMO systems

Abstract

For reducing the inter-user interference in multi-user multiple-input multiple-output (MU-MIMO) wireless communication systems, e.g., MIMO-orthogonal frequency division multiplexing (MIMO-OFDM) systems, it is often desirable to the complex pre- processing at the transmitter. This paper proposes a multi-user beamforming algorithm with sub-codebook selection. Based on the minimal leakage criterion, the codebook selection, limited feed-forward and minimum mean square error (MMSE) detection are combined in the proposed algorithm. This avoids the complex channel matrix decomposition and inversion. Consequently, the computational complexity at the transmitter is significantly reduced. Simulation results show that the proposed algorithm performs bet- ter than existing beamforming algorithms.