Application of frequency-shift filtering to the removal of adjacent channel interference in VLF communications

J F Adlard, T C Tozer, A G Burr

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The use of frequency-shift (FRESH) filtering for the rejection of adjacent channel interference (ACI) in GMSK modulated VLF communications is investigated. A range of scenarios based on a high powered interferer (up to 40 dB greater than the signal of interest (SOI)) in an adjacent channel to the SOI are tested, and the use of a FRESH filter for rejection of the interference is investigated. It is shown that a major improvement in BER performance over a fractionally spaced equaliser (FSE) is possible, and that only one interferer related frequency shift is required. This demonstrates that FRESH filters can be highly effective in ACI removal, with only a moderate increase in complexity over an FSE.

Original languageEnglish
Title of host publicationGLOBECOM 98: IEEE GLOBECOM 1998 - CONFERENCE RECORD, VOLS 1-6
Place of PublicationNEW YORK
Number of pages6
ISBN (Print)0-7803-4985-7
Publication statusPublished - 1998
EventIEEE Global Telecommunications Conference (GLOBECOM 98) - SYDNEY
Duration: 8 Nov 199812 Nov 1998


ConferenceIEEE Global Telecommunications Conference (GLOBECOM 98)

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