Adaptive time delay and frequency estimation for digital signal synchronization in CDMA systems

Author

Dooley, Saul R. ; Nandi, Asoke K.

Author_Institution

Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK

Volume

2

fYear

1998

fDate

1-4 Nov. 1998

Firstpage

1838

Abstract

The problem of synchronization of digital narrowband signals is presented. For non-stationary communication channels, accurate adaptive time delay and carrier frequency offset estimation is required. Modifications to a well-known time delay estimation method (the explicit time delay estimator), including a novel frequency adjustment element, are proposed which are shown through simulation to enable significantly low estimation bias, even at the very short filter lengths desirable in this application.

Keywords

adaptive estimation; code division multiple access; delay estimation; filtering theory; frequency estimation; interpolation; least mean squares methods; modulation; multiuser channels; synchronisation; CDMA systems; LMS algorithms; Lagrange interpolators; adaptive frequency estimation; adaptive time delay estimation; carrier frequency offset estimation; digital narrowband signals; digital signal synchronization; explicit time delay estimator; filter lengths; frequency adjustment element; low estimation bias; modulation; nonstationary communication channels; simulation; Adaptive filters; Delay effects; Delay estimation; Demodulation; Frequency estimation; Frequency synchronization; Interpolation; Multiaccess communication; Narrowband; Signal processing algorithms;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems & Computers, 1998. Conference Record of the Thirty-Second Asilomar Conference on

Conference_Location

Pacific Grove, CA, USA

ISSN

1058-6393

Print_ISBN

0-7803-5148-7

Type

conf

DOI

10.1109/ACSSC.1998.751641

Filename

751641