Interference Reduction Characteristics by Circular Array Based Massive MIMO in a Real Microcell Environment

Ryochi KATAOKA; Kentaro NISHIMORI; Ngochao TRAN; Tetsuro IMAI; Hideo MAKINO

doi:10.1587/transcom.E98.B.1447

Interference Reduction Characteristics by Circular Array Based Massive MIMO in a Real Microcell Environment

Ryochi KATAOKA, Kentaro NISHIMORI, Ngochao TRAN, Tetsuro IMAI, Hideo MAKINO

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The concept of massive multiple input multiple output (MIMO) has recently been proposed. It has been reported that using linear or planar arrays to implement massive MIMO yields narrow beams that can mitigate the interference signal even if interference cancellation techniques such as zero forcing (ZF) are not employed. In this work, we investigate the interference reduction performance achieved by circular array implemented massive MIMO in a real micro cell environment. The channel state information (CSI) is obtained by using a wideband channel sounder with cylindrical 96-element array in the 2-GHz band in an urban area. Circular arrays have much larger beamwidth and sidelobe level than linear arrays. In this paper, when considering the cylindrical array, the interference reduction performance between ZF and maximum ratio combining is compared when one desired user exists in the micro cell while the interference user moves around the adjacent cell. We show that ZF is essential for reducing the interference from the adjacent cell in the circular array based massive MIMO. The required number of antennas in the vertical and horizontal planes for the interference reduction is evaluated, in order to simplify the burden of signal processing for the ZF algorithm in massive MIMO. Because there are elements with low signal to noise power ratio (SNR) when considering cylindrical 96-element array, it is shown that the degradation of the signal to noise plus interference power ratio (SINR) when the number of antennas is reduced is smaller than that by ideal antenna gain reduction with a linear array. Moreover, we show that the appropriate antennas should be selected when a limited number of antennas is assumed, because the dominant waves arrive from certain specific directions.

Publication: IEICE TRANSACTIONS on Communications Vol.E98-B No.8 pp.1447-1455

Publication Date: 2015/08/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.E98.B.1447

Type of Manuscript: Special Section PAPER (Special Section on 5G Radio Access Networks―Part I: Radio Access Technologies and System Design)

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Authors

Ryochi KATAOKA
  Niigata University
Kentaro NISHIMORI
  Niigata University
Ngochao TRAN
  NTT DOCOMO INC.
Tetsuro IMAI
  NTT DOCOMO INC.
Hideo MAKINO
  Niigata University

Keyword

massive MIMO, circular array, microcell, maximum ratio combining, zero forcing, channel sounder

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Ryochi KATAOKA, Kentaro NISHIMORI, Ngochao TRAN, Tetsuro IMAI, Hideo MAKINO, "Interference Reduction Characteristics by Circular Array Based Massive MIMO in a Real Microcell Environment" in IEICE TRANSACTIONS on Communications, vol. E98-B, no. 8, pp. 1447-1455, August 2015, doi: 10.1587/transcom.E98.B.1447.
Abstract: The concept of massive multiple input multiple output (MIMO) has recently been proposed. It has been reported that using linear or planar arrays to implement massive MIMO yields narrow beams that can mitigate the interference signal even if interference cancellation techniques such as zero forcing (ZF) are not employed. In this work, we investigate the interference reduction performance achieved by circular array implemented massive MIMO in a real micro cell environment. The channel state information (CSI) is obtained by using a wideband channel sounder with cylindrical 96-element array in the 2-GHz band in an urban area. Circular arrays have much larger beamwidth and sidelobe level than linear arrays. In this paper, when considering the cylindrical array, the interference reduction performance between ZF and maximum ratio combining is compared when one desired user exists in the micro cell while the interference user moves around the adjacent cell. We show that ZF is essential for reducing the interference from the adjacent cell in the circular array based massive MIMO. The required number of antennas in the vertical and horizontal planes for the interference reduction is evaluated, in order to simplify the burden of signal processing for the ZF algorithm in massive MIMO. Because there are elements with low signal to noise power ratio (SNR) when considering cylindrical 96-element array, it is shown that the degradation of the signal to noise plus interference power ratio (SINR) when the number of antennas is reduced is smaller than that by ideal antenna gain reduction with a linear array. Moreover, we show that the appropriate antennas should be selected when a limited number of antennas is assumed, because the dominant waves arrive from certain specific directions.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E98.B.1447/_p

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@ARTICLE{e98-b_8_1447,
author={Ryochi KATAOKA, Kentaro NISHIMORI, Ngochao TRAN, Tetsuro IMAI, Hideo MAKINO, },
journal={IEICE TRANSACTIONS on Communications},
title={Interference Reduction Characteristics by Circular Array Based Massive MIMO in a Real Microcell Environment},
year={2015},
volume={E98-B},
number={8},
pages={1447-1455},
abstract={The concept of massive multiple input multiple output (MIMO) has recently been proposed. It has been reported that using linear or planar arrays to implement massive MIMO yields narrow beams that can mitigate the interference signal even if interference cancellation techniques such as zero forcing (ZF) are not employed. In this work, we investigate the interference reduction performance achieved by circular array implemented massive MIMO in a real micro cell environment. The channel state information (CSI) is obtained by using a wideband channel sounder with cylindrical 96-element array in the 2-GHz band in an urban area. Circular arrays have much larger beamwidth and sidelobe level than linear arrays. In this paper, when considering the cylindrical array, the interference reduction performance between ZF and maximum ratio combining is compared when one desired user exists in the micro cell while the interference user moves around the adjacent cell. We show that ZF is essential for reducing the interference from the adjacent cell in the circular array based massive MIMO. The required number of antennas in the vertical and horizontal planes for the interference reduction is evaluated, in order to simplify the burden of signal processing for the ZF algorithm in massive MIMO. Because there are elements with low signal to noise power ratio (SNR) when considering cylindrical 96-element array, it is shown that the degradation of the signal to noise plus interference power ratio (SINR) when the number of antennas is reduced is smaller than that by ideal antenna gain reduction with a linear array. Moreover, we show that the appropriate antennas should be selected when a limited number of antennas is assumed, because the dominant waves arrive from certain specific directions.},
keywords={},
doi={10.1587/transcom.E98.B.1447},
ISSN={1745-1345},
month={August},}

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TY - JOUR
TI - Interference Reduction Characteristics by Circular Array Based Massive MIMO in a Real Microcell Environment
T2 - IEICE TRANSACTIONS on Communications
SP - 1447
EP - 1455
AU - Ryochi KATAOKA
AU - Kentaro NISHIMORI
AU - Ngochao TRAN
AU - Tetsuro IMAI
AU - Hideo MAKINO
PY - 2015
DO - 10.1587/transcom.E98.B.1447
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E98-B
IS - 8
JA - IEICE TRANSACTIONS on Communications
Y1 - August 2015
AB - The concept of massive multiple input multiple output (MIMO) has recently been proposed. It has been reported that using linear or planar arrays to implement massive MIMO yields narrow beams that can mitigate the interference signal even if interference cancellation techniques such as zero forcing (ZF) are not employed. In this work, we investigate the interference reduction performance achieved by circular array implemented massive MIMO in a real micro cell environment. The channel state information (CSI) is obtained by using a wideband channel sounder with cylindrical 96-element array in the 2-GHz band in an urban area. Circular arrays have much larger beamwidth and sidelobe level than linear arrays. In this paper, when considering the cylindrical array, the interference reduction performance between ZF and maximum ratio combining is compared when one desired user exists in the micro cell while the interference user moves around the adjacent cell. We show that ZF is essential for reducing the interference from the adjacent cell in the circular array based massive MIMO. The required number of antennas in the vertical and horizontal planes for the interference reduction is evaluated, in order to simplify the burden of signal processing for the ZF algorithm in massive MIMO. Because there are elements with low signal to noise power ratio (SNR) when considering cylindrical 96-element array, it is shown that the degradation of the signal to noise plus interference power ratio (SINR) when the number of antennas is reduced is smaller than that by ideal antenna gain reduction with a linear array. Moreover, we show that the appropriate antennas should be selected when a limited number of antennas is assumed, because the dominant waves arrive from certain specific directions.
ER -