π/4-シフトQPSKおよびπ/2-シフトBPSKを用いたCDMA方式に関する研究

2 Citations 4 References
  • KASHYAP Kumud
    Department of Information Electronics, School of Engineering, Nagoya University
  • WADA Tadahiro
    Department of Information Electronics, School of Engineering, Nagoya University
  • KATAYAMA Masaaki
    Department of Information Electronics, School of Engineering, Nagoya University
  • YAMAZATO Takaya
    Department of Information Electronics, School of Engineering, Nagoya University
  • OGAWA Akira
    Department of Information Electronics, School of Engineering, Nagoya University

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Other Title
  • A study on the performance of the CDMA system using π/4-shift QPSK and π/2-shift BPSK

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本論文は, 送信機の非線形増幅特性が帯域制限スペクトル拡散CDMAシステムの特性に与える影響について述べている. 非線形増幅特性としては, バンドパスハードリミタ(BPHL)を考える. また変調方式として, 帯域制限による包絡線変動が比較的小さいπ/4-shift QPSKとπ/2-shift BPSKを採用し, 多元接続時におけるビット誤り率特性を求め, 非線形増幅の下における両変調方式の有効性を示した. また帯域制限された信号を非線形増幅することによるスペクトルの広がりについても, 帯域外幅射電力で評価し特にπ/2-shift BPSKが良い特性を示すことを明らかにした.
In this paper, we evaluate the effect of nonlinearity of the amplifier in the transmitter to the performance of the band-limited DS/SS CDMA systems using π/4-shift QPSK and π/2-shift BPSK. A band-pass hard-limiter (BPHL) is employed as the model of the nonlinear amplifier. As a result, it is shown that both modulation schemes are robust to nonlinear amplification from the viewpoint of error rate performance. It is also shown that, after nonlinear amplification preceded by the bandwidth limitation, π/2-shift BPSK has narrower bandwidth than π/4-shift QPSK.

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Details 詳細情報について

  • CRID
    1573668927143369728
  • NII Article ID
    110003197266
  • NII Book ID
    AN10013083
  • Text Lang
    en
  • Data Source
    • CiNii Articles

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