the power line is a pre-existing communication channel with the widest coverage. Power line carrier technology can realise data signal transmission in an intelligent network with the least extra wiring cost. So, most of engineers are paying attention to the development of PLC technology which has gradually become the main research hot spot in recent years. But the high impedance variation, high noise and the strong attenuation characteristic of the power grid in different regions, as well as in different periods of time, makes the actual data communication result a completely diversified one. The unsatisfied power grid environment becomes the biggest challenge to the power line carrier technology.
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