An efficient code-timing estimator for DS-CDMA systems over resolvable multipath channels

Authors:
Jianhua Liu;Jian Li
Affiliations:
College of Engineering, Embry-Riddle Aeronautical University, Daytona Beach, FL;Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2005

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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.