講演名 2017-10-24
[Poster Presentation] A Study on Beam Pattern of Array with Multi-User MIMO Using Null-Space Expansion Tolerant to Channel Fluctuation
塙 弘矩(福岡大), 茂木 大輔(福岡大), 太郎丸 真(福岡大), 太田 真衣(福岡大),
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抄録(和) Some papers reported that a zero-forcing (ZF) adaptive array antenna or multi-user MIMO system can be robust against channel variation due to fading and/or movement of the interfering terminals when the combining weights are set to cancel not only the most recent channels but also the previous ones of the interferences. This method is called “Null-Space Expansion” proposed by NTT. This report discusses the mechanism canceling the interferences focusing on the relation between the beam pattern formed by the MIMO weight and the incident waves of the propagation model. This report shows by computer simulations that the ZF weight vector both for the latest past interference channels additional to the present one is inclined to form nulls toward angle of arrival (AoA) of each the incident waves and the direct (line-of-sight) wave from the interference terminals. We also evaluate and discuss this phenomenon with the theoretical expressions. Those studies explain that Null-Space Expansion can be tolerant to channel fluctuation because the combining weight forms the beam pattern with nulls toward the AoA of each incident wave of the interferences which moves much slower than the phase fluctuation due to Doppler shift.
抄録(英) Some papers reported that a zero-forcing (ZF) adaptive array antenna or multi-user MIMO system can be robust against channel variation due to fading and/or movement of the interfering terminals when the combining weights are set to cancel not only the most recent channels but also the previous ones of the interferences. This method is called "Null-Space Expansion" and proposed by NTT. This report discusses the mechanism canceling the interferences focusing on the relation between the beam pattern formed by the MIMO weight and the incident waves of the propagation model. This report shows by computer simulations that the ZF weight vector both for the latest past interference channels additional to the present one is inclined to form nulls toward angle of arrival (AoA) of each the incident waves and the direct (line-of-sight) wave from the interference terminals. We also evaluate and discuss this phenomenon with the theoretical expressions. Those studies explain that Null-Space Expansion can be tolerant to channel fluctuation because the combining weight forms the beam pattern with nulls toward the AoA of each incident wave of the interferences which moves much slower than the phase fluctuation due to Doppler shift.
キーワード(和) アダプティブアレーアンテナ / MIMO / ビームパターン / ゼロフォーシング / ヌル空間
キーワード(英) adaptive array antenna / MIMO / beam pattern / zero-forcing / null space
資料番号 SR2017-89,SRW2017-39
発行日 2017-10-16 (SR, SRW)

研究会情報
研究会 SR / SRW
開催期間 2017/10/23(から2日開催)
開催地(和) Grand Hotel Palatino, Rome, Italy
開催地(英) Grand Hotel Palatino, Rome, Italy
テーマ(和) SmartCom2017
テーマ(英) SmartCom2017
委員長氏名(和) 梅林 健太(東京農工大) / 中川 匡夫(鳥取大)
委員長氏名(英) Kenta Umebayashi(Tokyo Univ. of Agric. and Tech.) / Tadao Nakagawa(Tottori Univ.)
副委員長氏名(和) 有吉 正行(NEC) / 亀田 卓(東北大) / 田野 哲(岡山大) / 濱湊 真(富士通研)
副委員長氏名(英) Masayuki Ariyoshi(NEC) / Suguru Kameda(Tohoku Univ.) / Satoshi Denno(Okayama Univ.) / Makoto Hamaminato(Fujitsu labs.)
幹事氏名(和) 石津 健太郎(NICT) / 矢野 一人(ATR) / 沢田 浩和(NICT) / 水谷 圭一(京大)
幹事氏名(英) Kentaro Ishizu(NICT) / Kazuto Yano(ATR) / Hirokazu Sawada(NICT) / Keiichi Mizutani(Kyoto Univ.)
幹事補佐氏名(和) 稲森 真美子(東海大) / 芝 宏礼(NTT) / Gia Khanh Tran(東工大) / 成枝 秀介(明石高専) / 斎藤 健太郎(東工大) / 山内 宏真(富士通研)
幹事補佐氏名(英) Mamiko Inamori(Tokai Univ.) / Hiroyuki Shiba(NTT) / Gia Khanh Tran(Tokyo Inst. of Tech.) / Syusuke Narieda(NIT, Akashi College) / Kentaro Saito(Tokyo Inst. of Tech.) / Hiromasa Yamauchi(Fujitsu labs.)

講演論文情報詳細
申込み研究会 Technical Committee on Smart Radio / Technical Committee on Short Range Wireless Communications
本文の言語 ENG
タイトル(和)
サブタイトル(和)
タイトル(英) [Poster Presentation] A Study on Beam Pattern of Array with Multi-User MIMO Using Null-Space Expansion Tolerant to Channel Fluctuation
サブタイトル(和)
キーワード(1)(和/英) アダプティブアレーアンテナ / adaptive array antenna
キーワード(2)(和/英) MIMO / MIMO
キーワード(3)(和/英) ビームパターン / beam pattern
キーワード(4)(和/英) ゼロフォーシング / zero-forcing
キーワード(5)(和/英) ヌル空間 / null space
第 1 著者 氏名(和/英) 塙 弘矩 / Hironori Ban
第 1 著者 所属(和/英) 福岡大学(略称:福岡大)
Fukuoka University(略称:Fukuoka Univ.)
第 2 著者 氏名(和/英) 茂木 大輔 / Daisuke Motegi
第 2 著者 所属(和/英) 福岡大学(略称:福岡大)
Fukuoka University(略称:Fukuoka Univ.)
第 3 著者 氏名(和/英) 太郎丸 真 / Makoto Taromaru
第 3 著者 所属(和/英) 福岡大学(略称:福岡大)
Fukuoka University(略称:Fukuoka Univ.)
第 4 著者 氏名(和/英) 太田 真衣 / Mai Ohta
第 4 著者 所属(和/英) 福岡大学(略称:福岡大)
Fukuoka University(略称:Fukuoka Univ.)
発表年月日 2017-10-24
資料番号 SR2017-89,SRW2017-39
巻番号(vol) vol.117
号番号(no) SR-257,SRW-258
ページ範囲 pp.63-64(SR), pp.57-58(SRW),
ページ数 2
発行日 2017-10-16 (SR, SRW)