A maximum likelihood approach for estimating DS-CDMA multipath fading channels

Authors:
E. G. Strom;F. Malmsten
Affiliations:
Dept. of Signals & Syst., Chalmers Univ. of Technol., Goteborg;-
Venue:
IEEE Journal on Selected Areas in Communications
Year:
2006

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Abstract

We propose a maximum likelihood approach for near-far robust synchronization of asynchronous direct sequence code division multiple access (DS-CDMA) systems operating over multipath channels. The algorithm is suitable for use in, for instance, a slotted system where each user transmits a short data burst with an embedded training sequence. The algorithm is shown to outperform the standard sliding correlator estimator. The Cramer-Rao bound is derived and is used to indicate the best performance that can be achieved by an unbiased estimator