Abstract
In this paper, we measured what influence the transmission loss characteristics of the electric power line with various forms gave to the transmission rate of OFDM (orthogonal frequency division multiplexing) signal through PLC (power line communication system) modem. We classified the electric power transmission line with various forms in a real environment into two basic elements, which are an outlet type branch and a switch type branch. Next, transmission rate is measured for a concise power line model composed of the outlet type and the switch type branches, which is connected with the PLC modem. As a result, it is revealed that the transmission rate is not so affected by the two branches mentioned above. At this time, the transmission characteristics of the electric power line are simulated from measured data. OFDM sending and receiving systems are composed on the computer and the transmission rate is simulated. It is clear that the transmission rates simulated agree with that measured.
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