Narrowband filtering effects on frequency-hopped signals
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Authors
Waters, Kevin A.
Subjects
Frequency-hopping
Narrowband Tone Jamming
FIR
IIR
Non-linear Phase Distortion
Narrowband Tone Jamming
FIR
IIR
Non-linear Phase Distortion
Advisors
Robertson, R. Clark
Kowalske, Kyle E.
Date of Issue
2002-12
Date
Publisher
Monterey, Calif. Naval Postgraduate School
Language
Abstract
A low complexity solution to remove follower, narrowband tone jamming signals which are randomly dispersed within the bandwidth of a hop without causing non-linear phase distortions in a frequency-hopping (FH) system is explored. Forward and reverse processed narrow stopband, elliptical infinite impulse response (IIR) filters are designed and applied to known audio and digital data. Analysis focuses on narrowband filtering one hop of a FH signal in the absence of noise. The results are compared with the output of equivalent finite impulse response (FIR) filters and equivalent forward processed IIR filters. This analysis demonstrates the effectiveness of forward and reverse narrow bandstop IIR filtering to eliminate unwanted tone jamming signals while preserving the phase of the received FH signal. These results also suggest that a FH system with narrow bandstop filtering can operate reliably in the presence of a high power tone jamming signal.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
xvi, 35 p. : ill. (some col.) ;
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.