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

• KATAOKA Ryochi

  Faculty of Engineering, Niigata University

• NISHIMORI Kentaro

  Faculty of Engineering, Niigata University

• TRAN Ngochao

  Research Laboratories, NTT DOCOMO INC.

• IMAI Tetsuro

  Research Laboratories, NTT DOCOMO INC.

• MAKINO Hideo

  Faculty of Engineering, Niigata University

Bibliographic Information

Other Title

• Massive MIMOにおける円筒形アレーを用いた実環境マイクロセルでの干渉除去特性
• Massive MIMO ニ オケル エントウケイ アレー オ モチイタ ミノル カンキョウ マイクロセル デ ノ カンショウ ジョキョ トクセイ

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.

Journal

• IEICE Transactions on Communications

  IEICE Transactions on Communications E98.B (8), 1447-1455, 2015

  The Institute of Electronics, Information and Communication Engineers

Keywords

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

Details

• CRID: 1390282679351036032
• NII Article ID: 110010011037
• NII Article ID: 130005090343
• NII Book ID: AA1123312X
• ISSN: 09135685
• ISSN: 17451345
• ISSN: 09168516
• DOI: 10.1587/transcom.e98.b.1447
• NDL BIB ID: 026247329
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026247329
• Web Site: https://www.jstage.jst.go.jp/article/transcom/E98.B/8/E98.B_1447/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed