Title :
Blind space-time RAKE structure based on second order statistics for DS-CDMA
Author :
Piechocki, Robert J. ; Canagarajah, Nishan ; McGeehan, Joe P.
Author_Institution :
Centre for Commun. Res., Bristol Univ., UK
Abstract :
This paper presents a new algorithm that ensures a low complexity implementation of a blind ST RAKE receiver for DS-CDMA. The algorithm is applicable for both periodic and non-periodic spreading sequences provided that the system utilizes two layers of code separation: a spreading code layer and a scrambling code layer. The new method consists of two kinds of recursions: PAST (projection approximation subspace tracking) recursions for a desired signal vector up-date and RLS-like recursions for a correlation matrix of interference and noise up-date. The proposed method maintains performance of a blind batch mode eigenanalysis method, while ensuring the convergence and tracking properties of a RLS optimal combiner
Keywords :
code division multiple access; eigenvalues and eigenfunctions; least squares approximations; matrix algebra; radio receivers; radiofrequency interference; random noise; spread spectrum communication; statistical analysis; DS-CDMA; RLS optimal combiner; blind space-time RAKE receiver; convergence properties; correlation matrix; eigenanalysis method; nonperiodic spreading sequences; periodic spreading sequences; projection approximation subspace tracking recursions; scrambling code layer; second order statistics; spreading code layer; tracking properties; Buildings; Convergence; Eigenvalues and eigenfunctions; Fading; Higher order statistics; Interchannel interference; Multiaccess communication; Multipath channels; Multiple access interference; Resonance light scattering;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944917
