Blind adaptive multiuser detection for periodically time varying interference suppression [DS-CDMA system applications]

Author

Whitehead, James ; Takawira, Fambirai

Author_Institution

Technol. Services Int. (TSI), South Africa

Volume

1

fYear

2005

Firstpage

273

Abstract

New cyclic multiuser detection (MUD) algorithms are presented in this paper which are based on blind adaptive MUD algorithms but have been modified such that they operate directly on the frequency shift (FRESH) architecture. The operation of both stochastic gradient descent (SGD) and recursive least squares (RSL) algorithms are examined. Suboptimal FRESH architectures are also investigated. The relative performance of the adaptive algorithms on the FRESH architecture is compared with an implementation on the filter bank architecture. This paper also investigates the relative sensitivity of the adaptive algorithms to timing jitter on these competing architectures.

Keywords

adaptive signal detection; code division multiple access; gradient methods; interference suppression; least squares approximations; multiuser detection; recursive estimation; spread spectrum communication; timing jitter; DS-CDMA; FRESH architecture; MUD algorithms; blind adaptive multiuser detection; cyclic multiuser detection; filter bank architecture; frequency shift architecture; periodically time varying interference suppression; recursive least squares algorithms; stochastic gradient descent algorithms; timing jitter; Adaptive algorithm; Filter bank; Frequency; Interference suppression; Least squares methods; Multiaccess communication; Multiuser detection; Stochastic processes; Time varying systems; Timing jitter;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference, 2005 IEEE

ISSN

1525-3511

Print_ISBN

0-7803-8966-2

Type

conf

DOI

10.1109/WCNC.2005.1424512

Filename

1424512