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Sensors 2016, 16(7), 1051; doi:10.3390/s16071051

First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands

NTT Access Network Service Systems Laboratories, Nippon Telegraph and Telephone Corporation, 1-1 Hikarino-oka, Yokosuka-shi, Kanagawa 239-0847, Japan
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Author to whom correspondence should be addressed.
Academic Editors: Yonghui Li, Kei Sakaguchi, Yong Li and He (Henry) Chen
Received: 7 May 2016 / Revised: 4 July 2016 / Accepted: 5 July 2016 / Published: 8 July 2016
(This article belongs to the Special Issue Millimeter Wave Wireless Communications and Networks)
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Abstract

Drastic improvements in transmission rate and system capacity are required towards 5th generation mobile communications (5G). One promising approach, utilizing the millimeter wave band for its rich spectrum resources, suffers area coverage shortfalls due to its large propagation loss. Fortunately, massive multiple-input multiple-output (MIMO) can offset this shortfall as well as offer high order spatial multiplexing gain. Multiuser MIMO is also effective in further enhancing system capacity by multiplexing spatially de-correlated users. However, the transmission performance of multiuser MIMO is strongly degraded by channel time variation, which causes inter-user interference since null steering must be performed at the transmitter. This paper first addresses the effectiveness of multiuser massive MIMO transmission that exploits the first eigenmode for each user. In Line-of-Sight (LoS) dominant channel environments, the first eigenmode is chiefly formed by the LoS component, which is highly correlated with user movement. Therefore, the first eigenmode provided by a large antenna array can improve the robustness against the channel time variation. In addition, we propose a simplified beamforming scheme based on high efficient channel state information (CSI) estimation that extracts the LoS component. We also show that this approximate beamforming can achieve throughput performance comparable to that of the rigorous first eigenmode transmission. Our proposed multiuser massive MIMO scheme can open the door for practical millimeter wave communication with enhanced system capacity. View Full-Text
Keywords: massive MIMO; multiuser MIMO; first eigenmode; millimeter wave; channel estimation; channel time variation massive MIMO; multiuser MIMO; first eigenmode; millimeter wave; channel estimation; channel time variation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Maruta, K.; Iwakuni, T.; Ohta, A.; Arai, T.; Shirato, Y.; Kurosaki, S.; Iizuka, M. First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands. Sensors 2016, 16, 1051.

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