Robust MMSE Precoding for Multiuser MIMO Relay Systems using Switched Relaying and Side Information
Y. Cai, R. C. de Lamare, L.L. Yang, M. Zhao

TL;DR
This paper introduces a robust MMSE precoding scheme for multiuser MIMO relay systems that uses switched relaying and side information to improve performance under imperfect CSI, reducing overhead and enhancing interference mitigation.
Contribution
It proposes a novel precoding method utilizing a codebook of unitary matrices and a selection mechanism to optimize transmission, with reduced signaling overhead.
Findings
Improved robustness against CSI estimation errors.
Enhanced interference mitigation in multiuser MIMO relay systems.
Reduced signaling overhead through index-based precoding.
Abstract
This study proposes a novel precoding scheme for multiuser multiple-input multiple-output (MIMO) relay systems in the presence of imperfect channel state information (CSI). The base station (BS) and the MIMO relay station (RS) are both equipped with the same codebook of unitary matrices. According to each element of the codebook, we create a latent precoding matrix pair, namely a BS precoding matrix and an RS precoding matrix. The RS precoding matrix is formed by multiplying the appropriate unitary matrix from the codebook by a power scaling factor. Based on the given CSI and a block of transmit symbols, the optimum precoding matrix pair, within the class of all possible latent precoding matrix pairs derived from the various unitary matrices, is selected by a suitable selection mechanism for transmission, which is designed to minimize the squared Euclidean distance between the…
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Taxonomy
TopicsCooperative Communication and Network Coding · Advanced MIMO Systems Optimization · Full-Duplex Wireless Communications
