Impact of CSI variation in subband on performance of vector perturbation based MU MIMO-OFDM system

• Hou Yafei

  ATR Wave Engineering Laboratories

• Sonobe Satoshi

  ATR Wave Engineering Laboratories

• Tsukamoto Satoshi

  ATR Wave Engineering Laboratories

• Yano Kazuto

  ATR Wave Engineering Laboratories

• Uno Masahiro

  ATR Wave Engineering Laboratories

• Kobayashi Kiyoshi

  ATR Wave Engineering Laboratories

抄録

Because of limitation of channel state information (CSI) feedback resource, multiuser (MU) MIMO-OFDM system usually divides all usable subcarriers into several subbands and the CSI of middle subcarrier of each subband is fed back. This feedback style generates CSI error among each subband. Due to this CSI error, a MU MIMO-OFDM system based on vector perturbation (VP) yields inefficient perturbation vectors (PVs) and mismatched spatial filters, which cause severe performance degradation. In this letter, we show that the performance degradation is mainly caused from the mismatched spatial filters rather than the inefficient PVs. This result is useful to design of a computational complexity reduction for the VP based system by reducing the matrix operations for PV search.

収録刊行物

• IEICE Communications Express

  IEICE Communications Express 2 (3), 86-92, 2013

  一般社団法人 電子情報通信学会

キーワード

• vector perturbation
• MMSE spatial filter
• MIMO-OFDM
• limited CSI feedback
• CSI error

詳細情報

• CRID: 1390282680393885952
• NII論文ID: 130003379293
• DOI: 10.1587/comex.2.86
• ISSN: 21870136
• Web Site: https://www.jstage.jst.go.jp/article/comex/2/3/2_86/_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