Title :
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
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;
Conference_Titel :
Africon, 1999 IEEE
Conference_Location :
Cape Town
Print_ISBN :
0-7803-5546-6
DOI :
10.1109/AFRCON.1999.820801
