Title :
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
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;
Conference_Titel :
Wireless Communications and Networking Conference, 2005 IEEE
Print_ISBN :
0-7803-8966-2
DOI :
10.1109/WCNC.2005.1424512
