A new method of the codeword reception of systematic codes

A simple method of decreasing the error probability for the reception of codewords of systematic codes is presented. In order to detect each symbol in a codeword we use different a priori probabilities for the redundant symbols and equal a priori probabilities for the message symbols. Optimal thresholds are calculated to detect the redundant symbols. The method of calculation of these a priori probabilities is proposed. Some examples illustrate the advantage of the suggested method.