A symbol interleaver communicates with the first divider and interleaves the first and second symbols when {TAIL ~ the first interleaved subsequences} of the first and second symbols are all zeros or the second interleaved subsequences of {HEAD ~ the first and second symbols} are all zeros 
A symbol interleaver communicates with the first divider and interleaves the first and second symbols when { TAIL ~ the first interleaved subsequences } of the first and second symbols are all zeros or the second interleaved subsequences of { HEAD ~ the first and second symbols } are all zeros
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL 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 HEAD HEAD OTH OTH OTH