Need of Time-domain Pre-processing of Impulse Noises for PLC/xDSL Systems

Appropriate characterization of impulse noise sources is necessary for reliable diagnostics of disturbers to handle performance issues in broadband communication systems. The impulse noises originating from primary disturbers, i.e., electrical and electronic appliances, reach the modem through different paths (channels) and hence pluralities of such noises increase. Diverse topologies of household electrical wiring introduce different types of time and frequency domain ambiguities in impulse noise characteristics before the noises reach the receiver. Hence, we propose that, if impulse noises are being observed at receiver and not directly at source, then time domain characterization should be done only after minimizing the effects of the channels from the observed noise recordings. In this paper we have demonstrated that time-domain pre-processing such as deconvolution is necessary to achieve reliable time-domain characterization if impulse noises are being observed at receiver.