We aim at the research to the decoding algorithm of turbo product codes, according to the principles of the log-likelihood ratio and the maximum a posteriori criterion, derive the log-likelihood ratio approximating expression, form the correct strategy of iterative soft decoding, and present the optimal algorithm through software.

“Double coding”who is come from Post modern building architectural creation technique is the mixture language of a kind of design, its performance for that these different quality elements such as new and old、traditional and modern、different cultural factor joining together, it is " mixed-blood " of different cultural element , so achieves in eclecticism of last design method.

Moreover,the rate of the proposed scheme is 1,the decoding complexity is nearly 1/8 of some known codes and simulation results show that it has better error performance than some codes.

Based on the improved Kontogiannis metrics and the automatic detection technology of duplicated code which is based on procedure blueprint,a tool for automatic detection of duplicated dode is designed.

The duplicated code not only reduces the maintainability of the software, but also is prone to introduce a significant proportion of bugs into systems.

This paper also proposes a method to detect duplicated code.