Detection of code index in turbo source coding

Lossless turbo source coding with decremental redundancy is an effective approach for compressing binary sources. In this method, the message is encoded using a turbo code. Then the parities are heavily punctured using an iterative process and all non-punctured parities along with side information are sent to the decoder. To improve the performance, a single code can be replaced by a library of codes. The message is compressed using each code and the best result is sent to the decoder. The side information contains the number of punctured parities and the index of the applied code. Instead of transmitting the code index, we find a criterion to detect the code index using the transmitted parities, at the decoder. Compared to the case where the code index is transmitted, our method helps to achieve a better rate for short block length turbo source coders.