 
Summary: Noise bucket effect for impulse noise
in OFDM
H.A. Suraweera and J. Armstrong
Impulse noise is a significant problem in some orthogonal frequency
division multiplexing (OFDM) applications. It has been observed in
practice that the degradation caused by impulse noise depends only on
the total energy of the noise during each OFDM symbol, not on the
structure of the noise. This `noise bucket' effect is explained by
showing that even for a small number of impulses per symbol the
noise distribution at the input of the receiver decision device is close to
Gaussian. This is because of the spreading effect of the discrete
Fourier transform.
Introduction: One of the advantages of orthogonal frequency division
multiplexing (OFDM) compared to single carrier systems is its
robustness against impulse noise. However impulse noise is still a
serious problem in OFDM based systems including digital video
broadcasting (DVB) [1, 2] and several techniques to mitigate the
effects of impulse noise have been proposed [3, 4].
There are many different sources of impulse noise such as car
ignitions, high voltage cables and domestic electrical appliances such
