A message update function specifically defined as part of the invention, is used to determine the outgoing message at {HEAD ~ the variable node}, and {TAIL ~ the simple min operation} along with modulo 2 sum of signs is used at the check node 
A message update function specifically defined as part of the invention , is used to determine the outgoing message at { HEAD ~ the variable node } , and { TAIL ~ the simple min operation } along with modulo 2 sum of signs is used at the check node
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 OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH