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