Patent ID: 6145114
Filing Date: 2000-11-07
Classification: G11B,H03M

Abstract:
A method of max-log-APP processing of input log-probability quantities, comprising the steps of:(a) producing first output log-probability quantities using a max-log-APP process based on a constraint set, each of said first output log-probability quantities corresponding to an input log-probability quantity from the input log-probability quantities;(b) computing a first extrinsic information value for each first output log-probability quantity from the first output log-probability quantities, said extrinsic information value computed as the difference between said output log-probability quantity and the corresponding input log-probability quantity;(c) for each first extrinsic information value, producing a corresponding second extrinsic information value based on the first extrinsic information values,at least one of the second extrinsic information values being smaller in magnitude than the corresponding first extrinsic information value, andwherein said second extrinsic information value and the corresponding first extrinsic information value correspond to a same input log-probability quantity; and,(d) adding each of said second extrinsic information values to the corresponding input log-probability quantity to provide second output log-probability quantities.