Ability of adaptive filters to track carrier offsets and channel nonstationarities

Author

Yousef, Nabil R. ; Sayed, Ali H.

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

50

Issue

7

fYear

2002

fDate

7/1/2002 12:00:00 AM

Firstpage

1533

Lastpage

1544

Abstract

This paper studies the tracking performance of adaptive filters operating in the presence of two sources of nonstationarities: carrier frequency offsets and random channel variations. Both impairments are common in digital communications due to mismatches between transmitter and receiver carrier generators and channel fading. The paper derives expressions for the mean-square error and shows how filter performance is degraded under such nonstationary conditions. Selections of step sizes for optimal tracking performance are derived, different adaptive algorithms are compared, and supporting simulation results are provided

Keywords

adaptive filters; adaptive signal processing; fading channels; filtering theory; mean square error methods; tracking filters; MSE; adaptive algorithms; adaptive filters; carrier offset tracking; channel fading; channel nonstationarity tracking; digital communications; filter performance; mean square error; optimal tracking performance; random channel variations; receiver carrier generator; simulation results; step sizes; transmitter carrier generator; Adaptive algorithm; Adaptive filters; Algorithm design and analysis; Degradation; Digital communication; Fading; Filtering algorithms; Finite impulse response filter; Frequency; Transmitters;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/TSP.2002.1011194

Filename

1011194