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Robust MMSE precoding based on switched relaying and side information for multiuser MIMO relay systems

Robust MMSE precoding based on switched relaying and side information for multiuser MIMO relay systems
Robust MMSE precoding based on switched relaying and side information for multiuser MIMO relay systems
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.
0018-9545
5677-5687
Cai, Yunlong
44a85b9f-185b-4078-aecd-02df90f5eab6
de Lamare, Rodrigo
bbaacd06-fc19-4116-bbfd-d96741c2f4f3
Yang, Lie-Liang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Zhao, Minjian
d552c3c1-57fd-4643-b914-4572ef291edf
Cai, Yunlong
44a85b9f-185b-4078-aecd-02df90f5eab6
de Lamare, Rodrigo
bbaacd06-fc19-4116-bbfd-d96741c2f4f3
Yang, Lie-Liang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Zhao, Minjian
d552c3c1-57fd-4643-b914-4572ef291edf

Cai, Yunlong, de Lamare, Rodrigo, Yang, Lie-Liang and Zhao, Minjian (2015) Robust MMSE precoding based on switched relaying and side information for multiuser MIMO relay systems. IEEE Transactions on Vehicular Technology, 64 (12), 5677-5687. (doi:10.1109/TVT.2014.2383388).

Record type: Article

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.

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More information

Accepted/In Press date: 12 December 2014
e-pub ahead of print date: 18 December 2014
Published date: 14 December 2015
Organisations: Faculty of Physical Sciences and Engineering

Identifiers

Local EPrints ID: 405178
URI: http://eprints.soton.ac.uk/id/eprint/405178
ISSN: 0018-9545
PURE UUID: ef93e4f0-91ba-4df3-85c7-aa3d184f4c3a
ORCID for Lie-Liang Yang: ORCID iD orcid.org/0000-0002-2032-9327

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Date deposited: 27 Jan 2017 15:38
Last modified: 26 Nov 2019 01:56

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Contributors

Author: Yunlong Cai
Author: Rodrigo de Lamare
Author: Lie-Liang Yang ORCID iD
Author: Minjian Zhao

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