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