SYNTHESIS OF ITERATIVE DECODER VITERBI FOR CODES WITH BRIEF SOURCE ALPHABET

Abstract

Earlier the diagram expected systematic convolutional component codes was applied to research of properties of turbo-codes in the iterative decoder on the basis of soft output Viterbi algorithm (SOVA). The problem is that the diagram of the iterative decoder on not systematic component codes wasn't developed. In the offered article for codes with the reduced input alphabet the algorithm of decoding of Viterbi with the soft decision is modified. Diagrams of a turbo coder on non-systematic component codes with the reduced input alphabet and the iterative decoder of such codes on the basis of the modified algorithm of Viterbi with the soft decision are synthesized.