Iteratively Decodable Codes.

The article discusses the iterative decoding. It may be defined as a technique employing a soft-output decoding algorithm that is iterated several times to improve the error performance of a coding scheme, with the aim of approaching true maximum-likelihood decoding, with less complexity. Error correcting codes can be broadly divided into two classes, product codes and density codes. Iterative decoding schemes belong to the first class. These are also known as turbo-like codes. The basic elements in the turbo coding scheme are coding structure, reliability based, iterative decoding and random permutation.