Patent ID: 6922446
Filing Date: 2005-07-26
Classification: H03M

Abstract:
1. A digital transmission system comprising at a transmitting end data ( 1 ) coding means ( 3 ), and at a receiving end iterative decoding means ( 20 ) for making hard decisions about received data ( 10 ), said iterative decoding means using said received data as initial input data, and including calculating means ( 220 ) for calculating for each iteration reliability data (f i.j ) relating to soft decisions (r′ i.j ) based on input data ( 13 , r i.j ), and means for reinserting subsequent input data (r i.j+1 ) for a next iteration, characterized in that said decoding means comprise transforming means ( 240 ) for calculating transformed data (t i.j ) based on said soft decisions so as to normalize the mean value of said reliability data, and means ( 250 ) for generating subsequent input data (r i.j+1 ) based on said transformed data (t i.j ).