Comparison of two techniques for attenuation of narrow-band interference in spread-spectrum communication systems

Author

Soderstrand, Michael A. ; Jenkins, W. Kenneth

Author_Institution

Univ. of California, Davis

fYear

2007

fDate

5-8 Aug. 2007

Firstpage

1026

Lastpage

1029

Abstract

A new adaptive notch filter based on the complex heterodyne approach achieves better performance than a similar filter designed using the popular Gray-Markel all-pass lattice circuit. Both adaptive filters make use of a simple second-order FIR adaptive filter using the LMS algorithm to detect the narrow-band interference. The Gray-Markel filter is tuned to the narrow-band interference by adjusting one parameter in the lattice circuit, while the complex heterodyne filter is fixed with the heterodyne frequency adjusted to the narrow-band interference. The new adaptive filter is able to respond to changes in the narrow-band interference frequency more quickly and provides better attenuation during the transition than does the popular Gray-Markel filter.

Keywords

FIR filters; adaptive filters; all-pass filters; electromagnetic wave scattering; heterodyne detection; interference (signal); lattice filters; least mean squares methods; notch filters; spread spectrum communication; FIR adaptive filter; Gray-Markel all-pass lattice circuit; LMS algorithm; adaptive notch filter; attenuation; complex heterodyne filter; heterodyne frequency; narrow-band interference; spread-spectrum communication system; Adaptive filters; Adaptive systems; Attenuation; Circuits; Finite impulse response filter; Frequency; Interference; Lattices; Narrowband; Spread spectrum communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2007. MWSCAS 2007. 50th Midwest Symposium on

Conference_Location

Montreal, Que.

ISSN

1548-3746

Print_ISBN

978-1-4244-1175-7

Electronic_ISBN

1548-3746

Type

conf

DOI

10.1109/MWSCAS.2007.4488737

Filename

4488737