For the coded data that was transmitted via a communication channel, a known code portion thereof that is {HEAD ~ a code portion} corresponding to {TAIL ~ known data} is detected 
corresponding to
For the coded data that was transmitted via a communication channel , a known code portion thereof that is { HEAD ~ a code portion } corresponding to { TAIL ~ known data } is detected
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH