Microsoft Word - articol3

Abstract: In this paper the desired turbo coding rates providing methods using the puncturing process and also the effect of this process on BER and FER performances are presented. The performances of the RSC turbo codes with puncturing and without puncturing having the same component codes are compared. The methods of the parity bits puncturing are investigated. In all cases we used the same method of the component codes trellis closing. The simulations were performed for K=3, K=4 and K=5 constraint length convolutional codes and the interleaver length of 1784 bits. We assumed an AWGN transmission channel and BPSK modulation. The turbo decoder uses 15 iterations per block and an iterations stopping criterion based on the LLR (Log-Likelihood Ratio). In conclusion, there are indicated the most appropriate solutions of the turbo codes puncturing with K=3, K=4 and K=5 constraint length.