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IEICE Transactions on Communications 2008 E91-B(1):53-61; doi:10.1093/ietcom/e91-b.1.53
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Cognitive Radio and Spectrum Sharing Technology -- Papers -- Spectrum Sharing

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

Teruhiko MIYATAKE1, Kazuki CHIBA2, Masanori HAMAMURA1 and Shin'ichi TACHIKAWA3

1 The authors are with the Graduate School of Engineering, Kochi University of Technology, Kami-shi, 782-8502 Japan. E-mail: hamamura.masanori{at}kochi-tech.ac.jp, 2 The author is with the Department of Engineering, Kochi University of Technology, Kami-shi, 782-8502 Japan., 3 The author is with the Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka-shi, 940-2188 Japan.


  Abstract

We propose a novel asynchronous direct-sequence code-division 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.

Key Words: spectrum sharing, spread spectrum, spreading sequence, direct sequence, multipath, COF, RAKE

Manuscript received May 7, 2007. Manuscript revised July 24, 2007.


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