Time delay estimation for multipath CDMA-systems based on a fast minimization technique for subspace fitting

Author

Bohlin, Patrik ; Ranheim, Anders ; Pelin, Per

Author_Institution

Dept. of Signals & Syst., Chalmers Univ. of Technol., Goteborg, Sweden

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

440

Lastpage

443

Abstract

A low complexity algorithm for parameter estimation in a block fading multipath DS-CDMA system is presented. The main contribution is a novel technique for minimizing a subspace fitting criterion which is obtained as a large sample approximation of the maximum likelihood (ML) estimator. The minimization procedure is based on an approximation of the exact criterion function, allowing a direct analytic solution. For the acquisition phase, an initialization procedure similar to alternating projections is employed which exhibits remarkable global convergence properties. The efficacy of the proposed method is demonstrated by means of numerical simulations

Keywords

code division multiple access; convergence of numerical methods; delay estimation; fading channels; maximum likelihood estimation; minimisation; multipath channels; spread spectrum communication; DS-CDMA; ML estimator; approximation; block fading; global convergence; initialization procedure; large sample approximation; maximum likelihood estimator; minimization; multipath system; numerical simulations; parameter estimation; signal acquisition; subspace fitting; time delay estimation; Delay effects; Delay estimation; Detectors; Fading; Maximum likelihood detection; Maximum likelihood estimation; Minimization methods; Multiaccess communication; Numerical simulation; Parameter estimation;

fLanguage

English

Publisher

ieee

Conference_Titel

Statistical Signal Processing, 2001. Proceedings of the 11th IEEE Signal Processing Workshop on

Print_ISBN

0-7803-7011-2

Type

conf

DOI

10.1109/SSP.2001.955317

Filename

955317