Asynchronous, Decentralized DS-CDMA Using Feedback-Controlled Spreading Sequences for Time-Dispersive Channels

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  • MIYATAKE Teruhiko
    Graduate School of Engineering, Kochi University of Technology
  • CHIBA Kazuki
    Department of Engineering, Kochi University of Technology The Institute of Electronics, Information and Communication Engineers
  • HAMAMURA Masanori
    Graduate School of Engineering, Kochi University of Technology The Institute of Electronics, Information and Communication Engineers
  • TACHIKAWA Shin'ichi
    Department of Electrical Engineering, Nagaoka University of Technology The Institute of Electronics, Information and Communication Engineers

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Abstract

We propose a novel asynchronous direct-sequence codedivision multiple access (DS-CDMA) using feedback-controlled spreading sequences (FCSSs) (FCSS/DS-CDMA). At the receiver of FCSS/DS-CDMA, the code-orthogonalizing filter (COF) produces a spreading sequence, and the receiver returns the spreading sequence to the transmitter. Then the transmitter uses the spreading sequence as its updated version. The performance of FCSS/DS-CDMA is evaluated over time-dispersive channels. The results indicate that FCSS/DS-CDMA greatly suppresses both the intersymbol interference (ISI) and multiple access interference (MAI) over time-invariant channels. FCSS/DS-CDMA is applicable to the decentralized multiple access.

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