Channel acquisition and tracking for the uplink of a code-division multiple-access system

Author

Carbonelli, C. ; D´Amico, A.A. ; Mengali, U. ; Morelli, M.

Author_Institution

Dept. of Inf. Eng., Pisa Univ., Italy

Volume

4

fYear

2003

fDate

11-15 May 2003

Firstpage

2547

Abstract

This paper investigates channel acquisition and tracking for the uplink of a DS-CDMA system. The transmission medium is characterized by multipath propagation and the goal is the estimate the time-varying channel impulse response (CIR) of a new user entering the system. Channel acquisition is pursued through maximum likelihood techniques while channel tracking is performed through weighted least squares methods. At each signaling interval the CIR estimate the inverse of the interference covariance matrix to mitigate the near-far problem. Performance is assessed by simulation in a scenario inspired by the UMTS system.

Keywords

code division multiple access; least mean squares methods; radio links; radiofrequency interference; radiowave propagation; spread spectrum communication; time-varying channels; DS-CDMA; channel acquisition; channel tracking; direct sequence code division multiple access; interference covariance matrix; maximum likelihood techniques; multipath propagation; time-varying channel impulse response; transmission medium; uplink tracking; weighted least squares methods; Covariance matrix; Delay estimation; Detectors; Fading; Fingers; Gaussian noise; Maximum likelihood detection; Maximum likelihood estimation; Multiaccess communication; Multiple access interference;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2003. ICC '03. IEEE International Conference on

Print_ISBN

0-7803-7802-4

Type

conf

DOI

10.1109/ICC.2003.1204406

Filename

1204406