NDLI: Robust MMSE Precoding Based on Switched Relaying and Side Information for Multiuser MIMO Relay Systems

Content Provider	IEEE Xplore Digital Library
Author	Yunlong Cai de Lamare, R.C. Lie-Liang Yang Minjian Zhao
Copyright Year	1967
Abstract	This paper 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 pre-estimated received vector and the true transmit symbol vector. We develop a minimum mean-square-error (MMSE) design algorithm to construct the latent precoding matrix pairs. In the proposed scheme, rather than sending the complete processing matrix, only the index of the unitary matrix and its power scaling factor are sent by the BS to the RS. This significantly reduces the overhead. Simulation results show that, compared with other recently reported precoding algorithms, the proposed precoding scheme is capable of providing improved robustness against the effects of CSI estimation errors and multiuser interference.
Sponsorship	IEEE Vehicular Technology Society
Starting Page	5677
Ending Page	5687
Page Count	11
File Size	1711871
File Format	PDF
ISSN	00189545
Volume Number	64
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Algorithm design and analysis MIMO Mean square error methods Covariance matrices Channel estimation Robustness MMSE Robust precoding switched relaying (SR) Minimum mean square error (MMSE) multiuser multiple-input–multiple-output (MIMO) relay robust precoding
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering

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