Blind space-time RAKE structure based on second order statistics for DS-CDMA
Robert J. Piechocki, Nishan C. Canagarajah, Joe P. McGeehan · 2002
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.