Evaluation of SOVA algorithm in turbo code

Abstract

The convolutional encoding with the Viterbi decoding algorithm represents one of the most popular techniques for direct error correction in the communication systems (forward error correction: FEC). This decoding technique has been proposed by A. Viterbi, it is based on maximum likelihood theory. The modification of this algorithm by introducing the soft value on the Viterbi algorithm makes it SOVA algorithm (soft output Viterbi algorithm), this modification gives the algorithm the possibility of quantifying the values of the received bits, so it will give more precise estimation of the decoded bit. The performance of the decoder will be from far more reliable.