LPM-Turbo Decoding Structure Based on Simulink

Turbo decoding model with the linear prediction model is developed in Simulink based on the turbo decoding theory to replace one of iterations and reduce the decoding delay time. The factors are presented in the results of simulation, which are the linear prediction model, the length of interleave and the different decoding arithmetics that influence on the error-correcting performance of the modified structure of turbo decoder. The error-rate performance of turbo decoding structure based on the linear prediction model is only lower by 0.0~0.2dB than the traditional one, and the modified model can reduce the decoding delay time. As the length of interleave increases, the performance of the modified decoding structure also increases, but the length of interleave should be chosen properly because the decoding delay time is proportional to the length of interleave. Log-MAP algorithm has the best performance, the performance of which is 0.5dB higher than MAX-Log-MAP algorithm when BER is 10^-2.