To decrease the probability of early misdetection, the sync mark is chosen to have minimum correlation with shifted versions of {HEAD ~ the sync mark} concatenated with {TAIL ~ the preamble field} 
concatenated with
To decrease the probability of early misdetection , the sync mark is chosen to have minimum correlation with shifted versions of { HEAD ~ the sync mark } concatenated with { TAIL ~ the preamble field }
OTH OTH 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 TAIL