METHOD FOR UPDATING A FACTOR GRAPH OF AN A POSTERIORI PROBABILITY ESTIMATOR

A method is described for updating a factor graph (10;10';10") of an a posteriori probability estimator, said factor graph comprising at least one repetition node (13;13';13") and at least one sum node (11;11';11"), wherein at least two connections are associated with each node, and wherein each connection is associated with an incoming message at said node and with an outgoing message from said node, wherein said method comprises the steps of: storing the nodes' incoming and outgoing messages into memory means (12;12';12") of said estimator as messages belonging to one same class of wrapped and/ or sampled Gaussian messages; updating said node of said factor graph (10;10';10") by using a resulting message belonging to said class of incoming messages, said resulting message being obtained by processing said incoming wrapped and/ or sampled Gaussian messages.