Have you encountered the error dectection of 12.65 AMR service when transmitting pn9 sequence data in downlink?
As we know, 12.65 AMR service DL data decoding need operate blind dectection which shall be try to decode each TF for the first transport channel and using CRC check to determine whether correct or not. But in my case, for a special section of pn9 sequence which includes in one TB, there will be 2 possible TFs(TF2 and TF4) which can be correctly decoded and CRC check are right. In fact TF4 is correct, but I don't know why TF2 is also considered as correct? Is there any solution to improve precision by changing parameters?