Recursive Code-Timing Estimation for DS-CDMA Signals in a Time-Varying Environment Through a Stochastic Optimization Approach

Author

Ma, Yugang

Volume

55

Issue

4

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

665

Lastpage

669

Abstract

A modified simulated-annealing method is proposed for recursively minimizing the nonlinear cost function in the subspace-based code-timing estimation for direct-sequence code-division multiple-access signals over a multipath fading channel. The new algorithm has low complexity, because of the recursive updating of the final code-timing estimates together with the noise-subspace tracking

Keywords

code division multiple access; fading channels; multipath channels; nonlinear functions; simulated annealing; spread spectrum communication; stochastic processes; DS-CDMA signals; direct-sequence code-division multiple-access signals; multipath fading channel; noise-subspace tracking; nonlinear cost function; recursive code-timing estimation; simulated-annealing method; stochastic optimization approach; subspace-based code-timing estimation; time-varying environment; Colored noise; Cost function; Fading; Gaussian noise; Multiaccess communication; Polynomials; Recursive estimation; Simulated annealing; Stochastic processes; Timing; Code-division multiple access (CDMA); code-timing estimation; gradient descent (GD); simulated annealing (SA); subspace; synchronization;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2007.894105

Filename

4155131