Title :
Spreading codes for direct sequence CDMA and wideband CDMA cellular networks
Author :
Dinan, Esmael H. ; Jabbari, Bijan
Author_Institution :
George Mason Univ., Fairfax, VA, USA
fDate :
9/1/1998 12:00:00 AM
Abstract :
This article presents an overview of the spreading techniques for use in direct sequence CDMA cellular networks. We review the theoretical background for sequences used in CDMA and wideband CDMA, and discuss the main characteristics of the maximal length, Gold (1967, 1968), and Kasami sequences, as well as variable- and fixed-length orthogonal codes. We also describe different methods of multiple spreading for channelization and scrambling in CDMA and W-CDMA realizations
Keywords :
cellular radio; code division multiple access; land mobile radio; pseudonoise codes; radio networks; sequences; spread spectrum communication; variable length codes; Gold sequences; Kasami sequences; cellular networks; cross-correlation properties; direct sequence CDMA; fixed-length orthogonal codes; maximal length sequences; multiple spreading; scrambling; spreading codes; variable-length orthogonal codes; wideband CDMA; Bandwidth; Baseband; Bit rate; Delay; Gold; Land mobile radio cellular systems; Multiaccess communication; Radio transmitters; Spread spectrum communication; Wideband;
Journal_Title :
Communications Magazine, IEEE
