Inter-code interference and optimum spreading sequence in frequency-selective Rayleigh fading channels on uplink MC-CDMA

Takashi Shono, Tomoyuki Yamada, Kiyoshi Kobayashi, Katsuhiko Araki, Iwao Sasase

研究成果: Article査読

2 被引用数 (Scopus)

抄録

In uplink multicairier code division multiple access (MC-CDMA), the inter-code interference (ICI) caused by the independent and frequency-selective fading channel of each user and the inter-carrier interference caused by the asynchronous reception of each user's OFDM symbols result in multiple access interference (MAI), This paper evaluates the ICI in frequency-selective Rayleigh fading channels for uplink MC-CDMA. We derive theoretical expressions for the desired-to-undesired signal power ratio (DUR) as a quantitative representation of ICI, and validate them by comparison with computer simulations using a Walsh-Hadamard (WH) code. Based on the analytical results, we obtain the optimum spreading sequence that minimizes the ICI (in short, maximizes the multiplexing performance); this sequence appears to be orthogonal. Three equalization combining methods are examined; equal gain combining (EGC), orthogonality restoring combining (ORC), and maximum ratio combining (MRC).

本文言語English
ページ(範囲)1981-1993
ページ数13
ジャーナルIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
E87-A
8
出版ステータスPublished - 2004 8月

ASJC Scopus subject areas

  • 信号処理
  • コンピュータ グラフィックスおよびコンピュータ支援設計
  • 電子工学および電気工学
  • 応用数学

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