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