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The market projection for Internet of Things (IoT) systems is appealing forthe Power Line Communication (PLC) technology. A massive growth and a pervasivepresence of these IoT objects is expected in our everyday life. About 20billion of IoT devices are forecasted to be installed in the next two years.PLC is a compelling technology that could become essential for certain IoTapplications. For example, sensor nodes and actuators used in the SmartBuildings domain can be connected through PLC. In this case, the PLC networkwill work as a backbone for the in-building communication. PLC systems, in thisdomain, will help to solve or reduce the overcrowded-spectrum problem,exploiting the existing cable infrastructure. Narrow band (NB) PLC is probablythe most suitable type of PLC technology for IoT applications. The main reasonsare: simple hardware, good coverage, appropriate bit-rate and low cost.Nevertheless, to guarantee reliable connectivity further analysis andimprovements should be done. There are such as signal propagationdiscontinuities, high channel attenuation and noise. Despite the fact that PLCnoise is a well-known problem, it still poses several challenges for thistechnology. This paper aims at adding some new consideration on this topic.This paper describes new results on MC NB noise. The MC noise is measuredbetween the Live-Protective Earth (L-PE) and between Neutral-Protective Earth(N-PE) pairs (L-PE-N configuration), to exploit the symmetries of the channel.The analysis in this paper considers the whole PLC NB frequency spectrum thatranges from 3 kHz to 500 kHz. It considers the noise observed at the two outputports of a given outlet in an in-building network with three conductors.

New Findings about Multi Conductor Noise in Narrow Band PLC