Patent ID: 8341488

Claim:
An apparatus, comprising: an APP (a posteriori probability) module that is operative to: calculate a change in a first APP value by subtracting a first check edge message from a second check edge message; and update the first APP value by adding the first APP value to the change in the first APP value thereby generating a second APP value; and a check module that is operative to employ the second APP value to update the second check edge message thereby generating a third check edge message; and wherein: the APP module is operative to: calculate a change in the second APP value by subtracting the second check edge message from the third check edge message; and update the second APP value by adding the second APP value to the change in the second APP value thereby generating a third APP value; and the apparatus is operative to employ the third APP value to make an estimate of an information bit encoded within an LDPC (Low Density Parity Check) coded signal.