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

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, m...

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Autores principales: Maruta, Kazuki, Iwakuni, Tatsuhiko, Ohta, Atsushi, Arai, Takuto, Shirato, Yushi, Kurosaki, Satoshi, Iizuka, Masataka
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4970098/
https://www.ncbi.nlm.nih.gov/pubmed/27399715
http://dx.doi.org/10.3390/s16071051
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author Maruta, Kazuki
Iwakuni, Tatsuhiko
Ohta, Atsushi
Arai, Takuto
Shirato, Yushi
Kurosaki, Satoshi
Iizuka, Masataka
author_facet Maruta, Kazuki
Iwakuni, Tatsuhiko
Ohta, Atsushi
Arai, Takuto
Shirato, Yushi
Kurosaki, Satoshi
Iizuka, Masataka
author_sort Maruta, Kazuki
collection PubMed
description 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.
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spelling pubmed-49700982016-08-04 First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands Maruta, Kazuki Iwakuni, Tatsuhiko Ohta, Atsushi Arai, Takuto Shirato, Yushi Kurosaki, Satoshi Iizuka, Masataka Sensors (Basel) Article 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. MDPI 2016-07-08 /pmc/articles/PMC4970098/ /pubmed/27399715 http://dx.doi.org/10.3390/s16071051 Text en © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Maruta, Kazuki
Iwakuni, Tatsuhiko
Ohta, Atsushi
Arai, Takuto
Shirato, Yushi
Kurosaki, Satoshi
Iizuka, Masataka
First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands
title First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands
title_full First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands
title_fullStr First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands
title_full_unstemmed First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands
title_short First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands
title_sort first eigenmode transmission by high efficient csi estimation for multiuser massive mimo using millimeter wave bands
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4970098/
https://www.ncbi.nlm.nih.gov/pubmed/27399715
http://dx.doi.org/10.3390/s16071051
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