| Abstract: | For the blind recognition of Turbo codes in information interception, the recognition algorithm of turbo codes on trellis termination fall into following two parts. In coding structure recognition, turbo codes on trellis termination is defined as linear block codes, so the blind recognition of code length and start is achieved by analyzing the rank of codes matrix with a different number of columns and a different start; In encoder parameter recognition, by comparing the sequence matrix's column vector before and after interleaving and determining the decision threshold, the influence of error codes whose number is lower than the decision threshold is removed, and consequently, the problem of poor fault-tolerant performance in the traditional interleaving mode recognition method is solved. Simulation shows that the correct percentage of recognition is higher than 80％ at 10-3 BER, and confirms the validity and reliability of the algorithm. |
