Low-voltage Power Line Communication Research Articles

Statistical analysis and simulation of indoor single-phase low voltage power-line communication channels on the basis of multipath propagation

With regard to emerging utilization of the HF band for power-line communication applications, narrowband statistical characteristics of corresponding fading channels along single-phase electric networks are being investigated. By the reasonable two-conductor transmission line approach for cabling components, a model giving channel transfer functions on account of multi-path propagation is proposed Appropriate assumptions based on indoor electric networks' topology are adopted concerning scattering points' spatial allocation, by which amplitudes are demonstrated to follow the lognormal distribution, whereas the normal distribution is extracted for arrival times. For this theoretical treatment, a suitable definition of the term path is introduced, inferred by reflection points discrete spatial distribution. Verification of statistical modelling is established, involving inventory through simulation. During the simulating process, a well applicable cable transmission-line model is used, and the configuration of a bus having numerous transverse branches connected in parallel is considered, which forms the fundamental topological element for electric networks. Simulation results show remarkable compliance with the behaviour theoretically anticipated, and the model proposed herein seems to precisely describe the power delay profile of indoor single-phase power-line communication channels in the HF spectral area.

A novel scheme for low voltage powerline communication signal processing

The low voltage powerline communication (LVPC) has become a hot research topic for electrical advancements in the recent years. On the one hand, the powerline represents a serious threat to the telecommunication system. On the other hand, it has a number of advantages that attract great interest for the development of electrical market and business opportunities. However, the powerline communication is known as noise oriented environment. The quality of the signal transmission is strongly polluted by the omnipresent noise, heavily jammed due to a variety of loads and unpredictable effects on signal propagation. For this reason, practical implementation of the high quality transmission through the powerline remains nowadays a difficult issue. This paper aims to develop a novel scheme to deal with this problem. The proposed scheme combines the advantages of both the wavelet transform and the Wigner–Ville distribution (WVD) methods. Wavelet Transform involves good characteristics in both time and frequency localization and can give a self-adjusting time–frequency window. WVD provides high resolution in time and frequency, because it is a real energy preserving transform. These methods are powerful investigation tools for time–frequency localization and signal readability in order to detect if an observed powerline signal contains desired information. Application of the proposed scheme to the signal measured from the real LVPC system shows the effectiveness of the proposed method.