Research on system capacity enhancement using network MIMO-OFDM for mobile communications

• Project/Area Number: 16K06369
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Communication/Network engineering
• Research Institution: Waseda University
• Principal Investigator: MAEHARA FUMIAKI 早稲田大学, 理工学術院, 教授 (80329101)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: ネットワークMIMO / マルチユーザMIMO-OFDM / マルチパス遅延 / シンボル間干渉 / ガードインターバル / 干渉抑圧 / 周期信号 / OFDM

Outline of Final Research Achievements

This research proposes a new transmission scheme to cope with problems in applying OFDM to network MIMO. Considering that network MIMO-OFDM suffers from degradation in the transmission efficiency in the presence of the difference in the multipath delay among multiple mobile terminals, the guard interval (GI) control scheme allowing some amount of inter-symbol interference (ISI) is proposed, which leads to achieving maximum system capacity. Thanks to the proposed approach, system capacity of wireless broadband networks can be further enhanced.

Academic Significance and Societal Importance of the Research Achievements

提案するネットワークMIMO-OFDMを対象としたガードインターバル長制御法により，ユーザのマルチパス遅延に差異があっても，全ユーザのシステム容量を常に最大化できることから，第5世代移動通信システム（5G）で求められる技術目標の一つである無線ネットワークの高速・大容量化に貢献できる．

Research Products

• [Journal Article] Guard Interval Control Scheme Using Theoretical System Capacity for MU-MIMO-OFDM Systems (2019)
  • Author(s): 菅沼 碩文, 齋藤 周平, 丸小 倫己, 前原 文明
  • Volume: J102-B
  • Issue: 8
  • Pages: 659-668
  • DOI: 10.14923/transcomj.2018JBP3050
  • ISSN: 1344-4697
  • Year and Date: 2019-08-01
  • Peer Reviewed
• [Presentation] MU-MIMO-OFDMにおけるISIを許容した伝送効率向上に関する一検討 (2018)
  • Author(s): 菅沼 碩文，齋藤 周平，丸小 倫己，前原 文明
  • Organizer: 電子情報通信学会 総合大会 B-5-40
• [Presentation] 電力正規化からみたMU-MIMOとスケジューリング技術の結合特性 (2018)
  • Author(s): 水谷 亮太，新保 薫子，蛭間 信博，菅沼 碩文，前原 文明
  • Organizer: 電子情報通信学会 総合大会 B-5-41
• [Presentation] Inter-symbol interference suppression scheme employing periodic signals in coded network MIMO-OFDM systems (2017)
  • Author(s): Hirofumi Suganuma, Shuhei Saito, Tomoki Maruko, Fumiaki Maehara
  • Organizer: Proc. 2017 IEEE Radio and Wireless Symposium (RWS2017), pp. 42-44
  • Place of Presentation: Phoenix, USA
  • Year and Date: 2017-01-15
  • Int'l Joint Research
• [Presentation] 要素技術連携を前提とした無線システムの効率化について (2017)
  • Author(s): 前原 文明
  • Organizer: 電子情報通信学会 技術研究報告 RCS2017-246
  • Invited
• [Presentation] Inter-symbol interference suppression scheme employing periodic signals in network MIMO-OFDM systems (2016)
  • Author(s): Hirofumi Suganuma, Tomoki Maruko, Fumiaki Maehara
  • Organizer: Proc. 2016 International Symposium on Antennas and Propagation (ISAP2016), pp. 276-277
  • Place of Presentation: Okinawa, Japan
  • Year and Date: 2016-10-24
  • Int'l Joint Research
• [Presentation] ネットワークMIMO-OFDMにおけるシンボル間干渉抑圧に関する検討 (2016)
  • Author(s): 菅沼碩文, 齋藤周平, 丸小倫己, 前原文明
  • Organizer: 映像情報メディア学会技術報告 BCT2016-62
  • Place of Presentation: 北海道大学
  • Year and Date: 2016-07-28
  • Invited