Abstract:

A coding parameters identification method is proposed, which is suitable for long constrained non-recursive systematic convolutional codes with a code rate of 1/2 and (n-1)/n obtained by puncturing the 1/2 code as the mother code. First, according to the coding principle, a linear block code with a code length of about 1/n of the original convolutional code constrained length is constructed by using the coding data; then, the check matrix of the linear block code is obtained, and the generator polynomial of the original convolutional code is reconstructed from the check matrix. Simulation experiments are carried out for two convolutional codes involved in IESS309. Compared with the existing method, when the code rate is 1/2, the recognition performance is improved by about 1dB; when the code rate is 2/3 and 3/4, the improvement is more than 2dB. Simulation results show that the proposed method is more effective than the existing method.

Key words: non-recursive systematic convolutional code, punctured convolutional code, linear block code, contrained length, generator polynomial