Mobility-aware null-space expansion for multiuser massive MIMO

• Funaki Nobutaka

  Graduate School of Science and Engineering, Chiba University

• Maruta Kazuki

  Academy for Super Smart Society, Tokyo Institute of Technology

• Ahn Chang-Jun

  Graduate School of Science and Engineering, Chiba University

抄録

This letter proposes adaptive null-space expansion (NSE) for multiuser massive MIMO according to users’ mobility. NSE can improve the robustness of multi-user spatial multiplexing in a time-varying channel by expanding null-steering to multiple past channels. Its superiority was verified under the unified moving speed among users. In a realistic environment, users with different speeds coexist. Null-space dimension, which is the number of nullified channels per user terminal, should be optimized in accordance with users’ mobility so as to maximize the beamforming gain and nullification capability. In our proposal, we first show that user mobility can be classified by observing the singular value of time-varying channels. Computer simulation then clarifies that output SINR can be improved by assigning null space dimensions respective to user moving speeds.

収録刊行物

• IEICE Communications Express

  IEICE Communications Express 10 (6), 324-330, 2021-06-01

  一般社団法人 電子情報通信学会

キーワード

• multiuser MIMO
• inter-user interference
• time-varying channel
• massive MIMO

詳細情報

• CRID: 1390006740596099200
• NII論文ID: 130008047238
• DOI: 10.1587/comex.2021xbl0054
• ISSN: 21870136
• Web Site: https://www.jstage.jst.go.jp/article/comex/10/6/10_2021XBL0054/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可