An analysis of the effects of filtering on the correlation characteristics of 4-phase sequences for CDMA applications

Author

Jamil, M. ; Linde, L.P. ; van Wyk, D.J.

Author_Institution

Dept. of Electr. & Electron. Eng., Pretoria Univ., South Africa

Volume

1

fYear

1999

fDate

1999

Firstpage

227

Abstract

This paper studies the construction and effects of filtering on the correlation properties of 4-phase sequences that are suitable for the use in spread spectrum multiple access communications. An introduction on the construction methods of these sequences from the set of binary sequences is presented. The effects of filtering on the correlation properties by using Nyquist and constant envelope root-of-unity (CE-LI-RU) filtering technique are also investigated. It is shown that it is possible to achieve better correlation properties by using the latter filtering method while maintaining the perfect constant envelope, which is not possible with Nyquist filtering

Keywords

binary sequences; code division multiple access; correlation methods; filtering theory; spread spectrum communication; 4-phase sequences; CDMA applications; DS-SSMA; Nyquist filtering effects; binary sequences; constant envelope root-of-unity filtering; correlation characteristics; direct sequence spread spectrum multiple access; spread spectrum multiple access communications; Africa; Bandwidth; Binary sequences; Filtering; Modulation coding; Multiaccess communication; Phase modulation; Phase shift keying; Spread spectrum communication; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Africon, 1999 IEEE

Conference_Location

Cape Town

Print_ISBN

0-7803-5546-6

Type

conf

DOI

10.1109/AFRCON.1999.820801

Filename

820801