Reduction of the impulsive noise emitted by a resistive load commutation

In power line or any cable communications, impulsive noise is assumed to be the most difficult noise to filter. In particular, it is impossible to predict when a non periodic asynchronous impulsive noise will appear. So, under such noise conditions, the OFDM symbol generally used in PLC, is corrupted. Signal-to-noise ratio is generally improved by detecting and/or filtering such noise to overcome this problem. Unfortunately, this leads to heavy detection and computing time in comparison with the disturbance duration. In this paper, we propose a new approach that consists in controlling the instant of commutation of a load. This approach allows reducing up to 15 dB the asynchronous impulsive noise emitted by a radiator in a 75-mus typical OFDM symbol duration.