Convergence analysis of the unpunctured turbo trellis-coded modulation (UTTCM)

Ahmed Haffane (Laboratory of Information Processing and Telecommunications (LTIT), Tahri Mohammed University of Bechar, Algeria)
Abdelhafid Hasni (Laboratory of Information Processing and Telecommunications (LTIT), Tahri Mohammed University of Bechar, Algeria)
Mustapha Khelifi (Laboratory of Information Processing and Telecommunications (LTIT), Tahri Mohammed University of Bechar, Algeria)
Boufeldja Kadri (Laboratory of Information Processing and Telecommunications (LTIT), Tahri Mohammed University of Bechar, Algeria)

Indonesian Journal of Electrical Engineering and Computer Science
Vol 13, No 2: February 2019

In this paper, the performance of the Unpunctured Turbo Trellis-Coded Modulation (UTTCM) over Additive White Gaussian Noise (AWGN) channel is analyzed using the non-binary extrinsic information transfer (EXIT) chart. The exchange of the extrinsic information between the decoder components is tracked, allowing the generation of an EXIT chart, which is a powerful tool for analyzing the convergence behavior of iterative decoding and prediction of convergence position. The Simulation results are compared with the turbo cliff positions on the BER curves.