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A Study on transmit power control per subcarrier in OFDM

Research Project

Project/Area Number 13650390
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 情報通信工学
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

OHGANE Takeo  Hokkaido Univ., Grad.School of Eng., Prof., 大学院・工学研究科, 助教授 (10271636)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Manabu  Hokkaido Univ., Grad.School of Eng., Prof., 大学院・工学研究科, 助教授 (20301939)
NISHIMURA Toshihiko  Hokkaido Univ., Grad.School of Eng., Inst., 大学院・工学研究科, 助手 (70301934)
OGAWA Yasutaka  Hokkaido Univ., Grad.School of Eng., Prof., 大学院・工学研究科, 教授 (70125293)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2003: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2002: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
KeywordsESDM / MIMO channel / Eigenbeam / Transmit power control / Bit-loading / Channel estimation error / Fading / OFDM / サブキャリア / 選択性フェージング
Research Abstract

In multiple-input multiple-output systems, most common application is space division multiplexing (SDM) where individual data substreams are transmitted from multiple antennas with the same power and the same rate. SDM applications assume that MIMO channel information in not available at the transmitter. If we know all of MIMO channel information, it is possible to assign matched beam to each substream where the optimum weight for beamforming is obtained by singular value decomposition of MIMO channel matrix. We call SDM with eigenbeam-forming as E-SDM, hereafter. In E-SDM, we have to consider resource (transmit power and data rate) adaptation. In this research, we employed minimum brt error rate (BER) criterion as expansion of transmit power control per sucarrier previously used in OFDM systems. As a result, E-SDM with the resource adaptation obtained higher BER performance in comparison to conventional SDM. However, the MIMO channel information required at the transmitter includes estimation and tracking errors. Under such errors, we also evaluated the E-SDM performance. The results show that degradation due to the channel estimation error is almost the same to E-SDM and SDM applications. Although the channel tracking error caused by a time lag until transmission degrades E-SDM performace severely when the maximum Doppler frequency is very high, we have shown that it can be compensated by employing the first-order extrapolation of estimated channel.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 堤 貴彦, 西村寿彦, 他2名: "各種空間分割多重方式におけるチャネル情報誤差の影響について"電子情報通信学会技術研究報告. RCS2003-92. 13-18 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 西村寿彦, 大鐘武雄, 他3名: "仲上-ライスフェージング環境間でのMIMO-SDM通信の特性比較"電子情報通信学会ソサイエティ大会講演論文集. B-5-31. 538-538 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takahiko Tsutsumi, Toshihiko Nishimura, Takeo Ohagne, Yasutaka Ogawa: "An impact of channel state information error on SDM applications"Technical Report of IEICE. RCS2003-92. 13-18 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Toshihiko Nishimura.Takeo Ohgane, Yasutaka Ogawa, Yasushi Takatori, Keizo Cho: "Performance of MIMO-SDM communications In Nakagami-Rician fading"Society Conference Proceedings of IEICE. B-5-31. 538 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 堤 貴彦, 西村寿彦, 他2名: "各種空間分割多重方式におけるチャネル情報誤差の影響について"電子情報通信学会技術研究報告. RCS2003-92. 13-18 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 西村寿彦, 大鐘武雄, 他3名: "仲上-ライスフェージング環境下でのMIMO-SDM通信の特性比較"電子情報通信学会ソサイエティ大会講演論文集. B-5-31. 538-538 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 宮下和巳: "MIMOチャネルにおける固有ビーム空間分割多重(E-SDM)方式"電子情報通信学会技術研究報告. RCS2002-53. 13-18 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kazumi Miyashita: "High data-rate transmission with eigenbeam-space division multiplexing(E-SDM) in a MIMO channel"Proceedings of IEEE VTC 2002-fall. 1. 190-194 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 頭川 裕紀: "OFDM信号のサブキャリア送信電力制御に関する検討"電子情報通信学会 技術研究報告. RCS2001-88. 55-60 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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