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

Lee, Heun-Chul (삼성 종합기술원)
Lee, Kwang-Won (고려대학교 공과대학 전기전자전파공학부 무선통신 연구실)
Lee, In-Kyu (고려대학교 공과대학 전기전자전파공학부 무선통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.3A, 2010 , pp. 260-268 More about this Journal
Abstract
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 multiple-input 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 non-iterative 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.
Keywords
Multiuser; MIMO; Downlink; Precoder Design; Regularized CI;
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