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Orthogonal Variable Spreading Factor Codes Suppressing Signal-Envelope Fluctuation

Tomoko K. MATSUSHIMA, Shoichiro YAMASAKI, Hirokazu TANAKA

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Summary :

Recently, complex orthogonal variable spreading factor (OVSF) codes based on polyphase orthogonal codes have been proposed to support multi-user/multi-rate data transmission services in synchronous direct-sequence code-division multiple access (DS-CDMA) systems. This study investigates the low signal-envelope fluctuation property of the complex OVSF codes in terms of transmission signal trajectories. In addition, a new method is proposed to suppress the envelope fluctuation more strongly at the expense of reducing the number of spreading sequences of the codes.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E106-A No.3 pp.445-449
Publication Date
2023/03/01
Publicized
2022/08/08
Online ISSN
1745-1337
DOI
10.1587/transfun.2022TAL0003
Type of Manuscript
Special Section LETTER (Special Section on Information Theory and Its Applications)
Category
Spread Spectrum Technologies and Applications

Authors

Tomoko K. MATSUSHIMA
  Yokohama College of Commerce
Shoichiro YAMASAKI
  Hiroshima City University
Hirokazu TANAKA
  Hiroshima City University

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