Title :
Subspace tracking for group-blind multiuser detection in asynchronous DS-CDMA systems
Author :
Yu, Jae-Chon ; Høst-Madsen, Anders ; Wang, Xiadong
Author_Institution :
TR Labs., Calgary Univ., Alta., Canada
Abstract :
This paper considers the real-time implementation of group-blind multiuser detection in the uplink of CDMA systems. The class of group-blind multiuser detectors is used in the situation where a group of users have unknown codes, while another has known codes, for example in the uplink of a CDMA system. Previous papers have only considered block based implementation. In this paper, for the real-time implementation and tracking the non-stationary channel characteristics, we propose using the FASIR (FAst Subspace Iteration with Ritz acceleration) algorithm for subspace tracking. Moreover, we use a Kalman-type of algorithm for the blind channel estimation
Keywords :
AWGN channels; Kalman filters; cellular radio; code division multiple access; filtering theory; iterative methods; matrix algebra; multipath channels; multiuser channels; radio links; radio tracking; signal detection; spread spectrum communication; AWGN channel; FASIR algorithm; Kalman-type algorithm; asynchronous DS-CDMA systems; blind channel estimation; cellular radio; codes; estimated channel matrix; fast subspace iteration with Ritz acceleration; group-blind multiuser detection; low computational complexity; multipath channels; multiuser interference; non-stationary channel characteristics tracking; real-time implementation; subspace tracking; uplink; Acceleration; Base stations; Blind equalizers; Decorrelation; Detectors; Error probability; Interference cancellation; Multiaccess communication; Multiuser detection; Real time systems;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851301
