Williamson-Hadamard spreading sequences for DS-CDMA applications

Jennifer Seberry, Beata J. Wysocki, Tadeusz A. Wysocki

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Orthogonal bipolar spreading sequences are used in direct sequence code division multiple access (DS-CDMA) systems for both-spectrum spreading and channel separation. The most commonly used sequences are Walsh-Hadamard sequences of lengths being an integer power of 2. A construction based on Williamson's arrays leading to sequences of lengths N≡4 (mod 8) is presented in the paper. Aperiodic correlation characteristics, for example sequence sets of lengths 12-252 are presented. The correlation properties of the sequence sets are later improved using a diagonal modification technique.

Original languageEnglish (US)
Pages (from-to)597-607
Number of pages11
JournalWireless Communications and Mobile Computing
Volume3
Issue number5
DOIs
StatePublished - Aug 1 2003

Keywords

  • Code division multiple access
  • Correlation functions
  • Spreading sequences
  • Williamson's arrays

ASJC Scopus subject areas

  • Information Systems
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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