Title :
Interference rejection in impulsive noise for VLF communications
Author :
Adlard, J.F. ; Tozer, T.C. ; Burr, A.G.
Author_Institution :
Dept. of Electron., York Univ., UK
fDate :
6/21/1905 12:00:00 AM
Abstract :
The use of frequency-shift (FRESH) filtering for the rejection of adjacent channel interference (ACI) in GMSK modulated VLF communications is investigated in the presence of impulsive noise. The effects of such filtering in conjunction with a simple “hole-punching” technique for removing impulses from the signal are characterised. A range of realistic scenarios based on a high powered GMSK interferer (10 to 30 dB greater than the signal of interest (SOI)) in an adjacent channel are described. It is known that in the presence of interference and Gaussian noise a simple FRESH filter, which exploits the cyclostationarity of the interferer, is highly effective at removing the interference. We show that when non-Gaussian impulsive noise is present, the FRESH filter is still effective against interference, even when the two signals have cyclic frequencies in common. However if hole-punching is used to remove the larger impulses of the noise, this adversely affects the performance of the FRESH filter
Keywords :
Gaussian noise; adjacent channel interference; filtering theory; impulse noise; interference suppression; minimum shift keying; radiocommunication; radiowave propagation; ACI; FRESH filter; GMSK; Gaussian noise; VLF communications; adjacent channel interference; cyclic frequencies; frequency-shift filtering; hole-punching technique; interference rejection; nonGaussian impulsive noise; signal of interest; Baseband; Filtering; Filters; Frequency; Gaussian noise; Interchannel interference; Low-frequency noise; Punching; Radio transmitters; Underwater communication;
Conference_Titel :
Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-5538-5
DOI :
10.1109/MILCOM.1999.822691
