The data processor 7, wherein {HEAD ~ the known data} comprises {TAIL ~ the code} corresponding to a filler bit 
The data processor 7 , wherein { HEAD ~ the known data } comprises { TAIL ~ the code } corresponding to a filler bit
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH