Regularized Channel Inversion for Multiple-Antenna users in Multiuser MIMO Downlink

— Channel inversion is one of the simplest techniques for multiuser downlink systems with single-antenna users. In this paper, we extend the regularized channel inversion technique developed for the single-antenna user case to multiuser multipleinput multiple-output (MIMO) channels with multiple-antenna users. We first employ the multiuser preprocessing to project the multiuser signals near the null space of the unintended users based on the MMSE criterion, and then the single-user preprocessing is applied to the decomposed MIMO interference channels. In order to reduce the complexity, we focus on noniterative solutions for the multiuser transmit beamforming and use a linear receiver based on an MMSE criterion. Simulation results show that the proposed scheme outperforms existing joint iterative algorithms in most multiuser configurations.

• Type: Conference
• Year: 2008
• Where: ICC
• Authors: Heunchul Lee, Kwangwon Lee, Bertrand M. Hochwald, Inkyu Lee
• Keywords: Channel Inversion, Communications, ICC 2008, Multiuser, Multiuser Downlink Systems