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

Volume

1

fYear

2001

fDate

2001

Firstpage

619

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd

Conference_Location

Rhodes

ISSN

1090-3038

Print_ISBN

0-7803-6728-6

Type

conf

DOI

10.1109/VETECS.2001.944917

Filename

944917