JOURNAL OF COMMUNICATIONS (JCM)
ISSN : 1796-2021
Volume : 4    Issue : 2    Date : March 2009

Improving the Power Line Communication Signal-to-Noise Ratio During a Resistive Load Commutation
Vincent Guillet, Guy Lamarque, Philippe Ravier, and Christophe Léger
Page(s): 126-132
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Abstract
In any cable or power line communications, impulse noise is known to be the most difficult noise to filter.
In particular, non periodic asynchronous impulse noise is impossible to predict. Under such noise
conditions, the OFDM1 symbol generally used in PLC2 is corrupted. To overcome this problem, the
signal-to-noise ratio is generally improved by detecting and/or filtering the noise. This leads however to
heavy detection and computing time in comparison with the disturbance duration. In this paper, we study
the parameters of the noise generated by a load commutation and propose a new approach that
consists in controlling the commutation instant of the load. This approach reduces by up to 15 dB the
asynchronous impulsive noise emitted by a resistive load in a 40.96-µs typical Homeplug AV3 OFDM
symbol duration. Synchronisation is integrated in electronic commutation system. Results show that the
load value does not influence the magnitude of the impulse noise.

Index Terms
Commutation, impulse noise, Signal-to-Noise Ratio (SNR) improvement, zero-crossing.