Precoding Scheme Robust to Imperfect CSI in Downlink Multiuser MIMO-OFDM System

• CHANG Linchen

  Tokyo Institute of Technology

• FUKAWA Kazuhiko

  Tokyo Institute of Technology

• SUZUKI Hiroshi

  Tokyo Institute of Technology

• SUYAMA Satoshi

  Tokyo Institute of Technology

Abstract

This paper proposes a precoding scheme for downlink multiuser MIMO-OFDM systems. The proposed precoding employs the minimum average bit error rate (MABER) criterion, and obtains precoding matrices by the steepest descent algorithm in order to minimize average BER of mobile stations. As the cost function of the proposed scheme, an upper bound of the average BER is derived from the pairwise error probability (PEP) and is averaged with respect to channel state information (CSI) errors. Thus, the MABER scheme is robust against imperfect CSI. Computer simulations under a frequency-selective fading condition demonstrate that the proposed precoder is more robust against the CSI errors than both the zero-forcing (ZF) precoder and a robust sum mean square error (SMSE) precoder, and that it is superior in BER to the conventional schemes.

Journal

• IEICE Transactions on Communications

  IEICE Transactions on Communications E94-B (12), 3515-3524, 2011

  The Institute of Electronics, Information and Communication Engineers

Keywords

• multiuser MIMO
• MIMO-OFDM
• precoding
• imperfect channel state information
• steepest descent algorithm

Details

• CRID: 1390001204376823808
• NII Article ID: 10030536097
• NII Book ID: AA10826261
• DOI: 10.1587/transcom.e94.b.3515
• ISSN: 17451345
• ISSN: 09168516
• Web Site: http://www.jstage.jst.go.jp/article/transcom/E94.B/12/E94.B_12_3515/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed