ミリ波帯MIMO-OFDM伝送における空間拡散選択を行う再送サブキャリアブロック位相ホッピング方式 (無線通信システム) -- (移動通信ワークショップ)  [in Japanese] Subcarrier-Block Phase Hopping with Retransmission and Space Spreading Selection for Millimeter-Wave MIMO-OFDM Systems  [in Japanese]

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Author(s)

Abstract

チャネルのインパルス応答を推定し,直接波のレベルに応じて送信信号の空間拡散を選択的に行う再送サブキャリアブロック位相ホッピング(RSBPH)を提案する.ミリ波帯MIMO-OFDM伝送では近距離通信を想定しており,伝搬環境はあまり時間変化しないため,再送制御を行うと再送回数が多くなるという問題があり,この解決法としてRSBPHが提案されている.しかしながら,直接波のレベルが高い場合,Walsh-Hadamard行列を用いて空間拡散を行うと信号分離が難しくなり,スループット特性が劣化するという問題が新たに判明した.そこで本報告では,インパルス応答を用いて直接波の相対レベルを推定し,しきい値より小さい場合のみ空間拡散を行うことで,即ち空間拡散選択を行うことでパケットの正常受信確率を向上させるRSBPHを提案する.位相雑音や仲上ライスフェージングを伴う伝搬条件で計算機シミュレーションを行い,従来技術よりも優れたスループット特性が得られることを明らかにする.また,提案方式のPAPR抑圧効果についても定量的に評価する.

This report proposes a subcarrier-block phase hopping with retransmission and space spreading selection (proposed RSBPH) for the millimeter-wave MIMO-OFDM systems. Since the millimeter wave MIMO-OFDM transmission aims at short distance communications, channels of the millimeter wave MIMO-OFDM do not rapidly vary. Therefore, the number of retransmitted packets for retransmission systems cannot be reduced. To solve such a problem, conventional RSBPH has been proposed, which results in increasing the probability of correctly received packets. When a level of line of sight (LOS) components is high in comparison with those of non-LOS components, however, perfoming spatial spreading by Walsh-Hadamard matrices makes signal separation hard and thus degrades throughput performance. To cope with such degradation, this report proposes space spreading selection that can increase the probability of successfully received packets. This scheme estimates a relative power of the LOS components and selects the space spreading only when the estimated relative power is greater than a threshold. Computer simulations under Nakagami Rice multipath fading with phase noise show that the proposed scheme is superior to the conventional systems in throughput performance. In addition, PAPR reduction by the proposed scheme is also evaluated.

Journal

  • Technical report of IEICE. RCS

    Technical report of IEICE. RCS 114(490), 47-52, 2015-03-04

    The Institute of Electronics, Information and Communication Engineers

Codes

  • NII Article ID (NAID)
    110010017777
  • NII NACSIS-CAT ID (NCID)
    AN10060822
  • Text Lang
    JPN
  • ISSN
    0913-5685
  • NDL Article ID
    026327595
  • NDL Call No.
    Z16-940
  • Data Source
    NDL  NII-ELS 
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