Simulation of 8 kbps ACELP over GSM platform

This study engages the 8 kbps ACELP vocoder on a GSM radio interface software simulation platform. A robust channel codec module is developed to protect the coded bits against fading and GAUSS noise and adapt the ACELP vocoder into the GSM TCH/FS platform. In addition, an error-concealment unit (ECU) is introduced into the ACELP decoder for better synthetic quality over a seriously corrupted channel. The performance of the ACELP vocoder over GSM environment is explored, which include the test of the reconstructed speech quality and the bit-error-rate statistics over typical channel models under different SNR. The final analyses show that this vocoder has better performance than GSM full rate speech coder over a deteriorated transmission environment