A robust method for estimating multipath channel parameters in the uplink of a DS-CDMA system

Vasileios Kekatos, Athanasios A. Rontogiannis, Kostas Berberidis

Research output: Contribution to journalConference articlepeer-review

Abstract

In this paper, the problem of estimating the multipath channel parameters of a new user entering the uplink of an asynchronous Direct Sequence - Code Division Multiple Access (DS-CDMA) system is addressed. The problem is described via a least squares (LS) cost function, which is non-linear with respect to the time delays and linear with respect to the gains of the multipath channel. This cost function is proved to be approximately decoupled in terms of the path delays, and thus an iterative procedure of one-dimensional searches turns out to be adequate for time delays estimation. The resulting method is computationally efficient and performs well even for a small number of training symbols. Simulation results show that the proposed technique offers a better estimation accuracy compared to existing related methods, and is robust to multiple access interference.

Original languageEnglish (US)
Pages (from-to)3127-3131
Number of pages5
JournalIEEE Vehicular Technology Conference
Volume61
Issue number5
StatePublished - Oct 17 2005
Event2005 IEEE 61st Vehicular Technology Conference -VTC 2005 - Spring Stockholm: Paving the Path for a Wireless Future - Stockholm, Sweden
Duration: May 30 2005Jun 1 2005

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