Joint channel and carrier offset estimation in CDMA communications

Author

Li, Kemin ; Liu, Hui

Author_Institution

Dept. of Electr. Eng., Virginia Univ., Charlottesville, VA, USA

Volume

47

Issue

7

fYear

1999

fDate

7/1/1999 12:00:00 AM

Firstpage

1811

Lastpage

1822

Abstract

This paper addresses the problem of CDMA multiuser detection in the presence of unknown multipath channels and residual carriers. An analytic algorithm that provides closed-form channel and carrier offset estimates is proposed. The algorithm first converts the multiuser estimation problem into single- user problems and then analytically solves the resulting nonlinear multivariate optimization problems using a polynomial matrix projection property. The performance of the proposed algorithm is investigated: through first-order perturbation analysis. We also calculate the Cramer-Rao bound (CRB) to illustrate the efficiency of the new algorithm. The analyzes are supported by computer simulations

Keywords

blind equalisers; code division multiple access; frequency estimation; multipath channels; multiuser channels; optimisation; perturbation techniques; polynomial matrices; signal detection; CDMA communications; Cramer-Rao bound; analytic algorithm; blind equalisation; carrier offset estimation; channel estimation; closed-form channel; computer simulations; efficiency; first-order perturbation analysis; joint estimation; multipath channels; multiuser detection; multiuser estimation; nonlinear multivariate optimization; performance; polynomial matrix projection; residual carriers; single- user problems; Algorithm design and analysis; Blind equalizers; Intersymbol interference; Maximum likelihood estimation; Multiaccess communication; Multipath channels; Multiuser detection; Polynomials; Signal processing; Signal processing algorithms;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/78.771031

Filename

771031