A decoder of LDPC codewords using the iterative belief propagation algorithm stores a posteriori information on variables. An updating device updates the a posteriori information on variables, and a first computation device computes variables to constrain messages from a posteriori information on variables...http://www.google.com/patents/US7174495?utm_source=gb-gplus-sharePatent US7174495 - LDPC decoder, corresponding method, system and computer program
