Impact of Soft Input Decryption using feedback on channel decoding

Soft Input Decryption is an efficient method for correction of cryptographic check values using L-values of SISO channel decoding. Improvement of Soft Input Decryption is performed by introducing a feedback from the Soft input decryptor to the SISO channel decoder. Feedback enables correction of blocks of messages and cryptographic check values using blocks already corrected by Soft Input Decryption. This paper researches the impact of feedback, depending on the length of block which has to be corrected. Performed simulations show results of previous theoretical analysis on several examples.