Decision error correcting method of a digital communication system and

Abstract

A decision error correcting method that is adopted to a general digital communication system having a decision circuit finding an original message from a received signal to remove a misdecision-to-adjacent symbol. The decision error correcting method includes performing a soft decision for a received suspicious signal with all the candidate symbols, computing error distances between the suspicious signal and all the candidate symbols, computing respective error distances between each candidate symbol and following signals received immediately after the suspicious signal for a predetermined test period of time, adding the error distances for each candidate symbol, comparing sums of the error distances to select a least sum of the error distances, and selecting the candidate symbol and following symbols detected after the selected candidate symbol resulting in the least sum of the error distances as original message symbols corresponding to one suspicious signal and the following signals.