System for power line communication on multi-carrier modulation

摘要

PURPOSE: A power line communication system using a DMT(Discrete Multi-Tone) modulation type is provided to satisfy an electronic wave limit standard by performing a baseband transmission using the DMT modulation type, raising an output of a transmission signal in a low frequency band, and lowering the output of the transmission signal in a high frequency band. CONSTITUTION: A transmission device(T) multiplies a weight value(N) according to a corresponding carrier for raising an output of a transmission signal in a low frequency band and lowering the output of the transmission signal in a high frequency band. A power line communication channel(35) supplies the signal transmitted from the transmission device(T) to the outside through a power line(32). A receipt device(R) multiplies data information provided through the power line communication channel(35) by a weight value(1/N) and recovers the data for improving a signal-to-noise ratio in the low frequency band and limiting an electronic wave emission in the high frequency band.