Investigation on a new combined impulsive noise mitigation scheme for OFDM transmission

Abstract

Impulsive noise mitigation for Orthogonal Frequency Division Multiplexing (OFDM) can be done with a clipping-nulling scheme using two thresholds. We introduce a new combined impulsive noise mitigation scheme, called clipping-replacement-nulling scheme, in which there are three considered thresholds: the clipping threshold Tclip, the replacement threshold Trep, and the nulling threshold Tnull. When the magnitude of a received OFDM sample is above Trep and below Tnull we set it to the average magnitude |x̅| of the noiseless OFDM samples. The simulation results show that an additional action, the replacement action, with a good choice of Trep brings a reduction in the bit error rate.