a power estimation module providing {HEAD ~ a power estimation parameter} for {TAIL ~ each} of said modified signals and said noise signal; and 
for
a power estimation module providing { HEAD ~ a power estimation parameter } for { TAIL ~ each } of said modified signals and said noise signal ; and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH