Frequency-Shift Filtering in VLF Communications for Interference Rejection in Impulsive Noise
نویسنده
چکیده
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 “holepunching” technique for removing impulses from the signal are characterised. A range of 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. However if hole-punching is used to remove the larger impulses of the noise, this adversely affects the performance of the FRESH filter. It is concluded that in high powered interference environments FRESH filtering is very effective, but it can be better to not use hole-punching to avoid degrading the interference rejection.
منابع مشابه
Interference Rejection in Impulsive Noise for VLF Communications
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 inte...
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