By correlating the signals, it is possible to determine {HEAD ~ the actual impedance} of {TAIL ~ the power line} 
of
By correlating the signals , it is possible to determine { HEAD ~ the actual impedance } of { TAIL ~ the power line }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL