Article
Williamson-Hadamard Spreading Sequences for DS-CDMA Applications
Faculty of Informatics - Papers (Archive)
RIS ID
7097
Publication Date
1-1-2003
Abstract
Orthogonal bipolar spreading sequences are used in direct sequence code division multiple acces (DS-CDMA) systems for both spectrum spreading and channel separation. The most commonly used sequences are Walsh-Hadamard sequences of lenghts 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.
Disciplines
Citation Information
Jennifer Seberry, Beata J Wysocki and Tadeusz A Wysocki. "Williamson-Hadamard Spreading Sequences for DS-CDMA Applications" (2003) Available at: http://works.bepress.com/jseberry/366/
Jennifer Seberry, Beata J. Wysocki and Tadeusz A. Wysocki Williamson-Hadamard Spreading Sequences for DS-CDMA Applications, Special Issue on "Coding and Its Applications in CDMA Wireless Systems", Journal of Wireless Communications and Mobile Computing. 3 (2003), 597-607.