Cybernetics and Information Technologies
Volume 6, No 2. Sofia, 2006, Bulgarian Academy of Sciences

Cyclic Parameters of an Information Channel over the 220 V Power Line

Lidiya Nikolova

Institute of Information Technologies, 1113 Sofia

Abstract: The electrical network is not a conventional communication medium. Moreover, in the traditional sense it is hostile. The modern sophistic methods of signals processing and communication enable its successful use as communication medium. The present paper investigates the features of the electrical power line – explicit non-coordinated loading and its modulation by the network voltage.

The research is directed towards high-speed communication occupying a band up to 30 MHz. The relation of the system functions of the low-voltage supply line of 220 V and the parameters characterizing it as a medium of multi-path propagation is studied with respect to the main harmonic (50 Hz). Investigations of a real network are accomplished and the parameters introduced are defined.

Keywords: time-varying channel; multi-path propagation; fading; Doppler’s spread; frequency and time coherence.