On decoding of single parity product codes using modified chase algorithm

This paper deals with iterative decoding algorithm for two and more dimensional turbo product codes, built using single parity block codes. Decoding algorithm used in this paper is modified version of Soft-Chase algorithm. Decoding is based on soft-input / soft-output decoders ( SlSO ) for decoding components codes. The soft inputs of decoder include two values, the soft channel value and a priori value. The soft output of the component¿s decoder is an estimation of the log-likelihood ratio (LLR ) of binary decisions given by Chase decoder. These extrinsic values are used in feedback as a priori information for next iteration. The performance of different single parity codes are given for Gaussian channel.