Title :
Application of frequency-shift filtering to the removal of adjacent channel interference in VLF communications
Author :
Adlard, J.F. ; Tozer, T.C. ; Burr, A.G.
Author_Institution :
Dept. of Electron., York Univ., UK
Abstract :
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
Keywords :
adjacent channel interference; computational complexity; error statistics; interference suppression; minimum shift keying; time-varying filters; BER performance; FRESH filtering; GMSK; VLF communications; adjacent channel interference; complexity; frequency-shift filtering; high powered interferer; signal of interest; Adaptive filters; Bit error rate; Degradation; Filtering; Frequency; Interchannel interference; Optical propagation; Radio transmitters; Testing; Underwater vehicles;
Conference_Titel :
Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE
Conference_Location :
Sydney,NSW
Print_ISBN :
0-7803-4984-9
DOI :
10.1109/GLOCOM.1998.775853
