Subspace-based Estimation Methods Suitable for Downlink DS-CDMA Blind Detectors

Cassio G. G. Soares, Marcello L. R. de Campos

DOI: 10.14209/its.2002.430

Evento: 2002 International Telecommunications Symposium (ITS2002)

Keywords:

Abstract

"In subspace-based blind linear multiuser detection we may use a subspace tracking algorithm and a blind method for estimating the composite code vector, which is the convolution of the user code and the multipath channel. In this paper we propose two subspace tracking algorithms based on the Power method, one with O(N^2 L) and the other with O(NL) operations per update (where N is the dimension of sampled received signal and L is the rank of the estimated subspace). We also propose a blind method for estimating the composite code vector, which uses the estimated signal suboperations per update (considspace bases. This method requires O(N^2 L) operations per update (considering that L is larger than the number of multipath gains). The proposed algorithms are suitable for subspace-based blind linear multiuser detectors for DS-CDMA system downlink. Computer simulations show superior performance of the methods proposed in comparison with other methods presented in the literature."

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