Open Access

An Efficient Code-Timing Estimator for DS-CDMA Systems over Resolvable Multipath Channels

EURASIP Journal on Advances in Signal Processing20052005:680571

https://doi.org/10.1155/ASP.2005.670

Received: 31 July 2003

Published: 20 April 2005

Abstract

We consider the problem of training-based code-timing estimation for the asynchronous direct-sequence code-division multiple-access (DS-CDMA) system. We propose a modified large-sample maximum-likelihood (MLSML) estimator that can be used for the code-timing estimation for the DS-CDMA systems over the resolvable multipath channels in closed form. Simulation results show that MLSML can be used to provide a high correct acquisition probability and a high estimation accuracy. Simulation results also show that MLSML can have very good near-far resistant capability due to employing a data model similar to that for adaptive array processing where strong interferences can be suppressed.

Keywords and phrases

DS-CDMAsynchronizationcode timingmultipath channels

Authors’ Affiliations

(1)
College of Engineering, Embry-Riddle Aeronautical University
(2)
Department of Electrical and Computer Engineering, University of Florida

Copyright

© Liu and Li 2005