Impulsive noise suppression in DFT-SOFDM system

The DFT-SOFDM is a high date rate underwater acoustic transmission scheme even for underwater military communication. It has been widely studied to overcome the complexity of underwater acoustic channels. Generally speaking, multi-carrier transmission systems have many obvious advantages. They are less sensitive to impulsive noise than single-carrier systems. The longer symbol duration provides an advantage in a presence of impulsive noise. Nevertheless, it was recently recognized that this advantage turns into a disadvantage, if the impulsive noise energy exceeds a certain threshold. In this paper, nonlinearity methods for impulsive noise suppression in DFT-SOFDM receivers are considered. The experimental results of this comparative study show that the blanking nonlinearity performs better than the clipping nonlinearity.