Why my TurboAWGNsystem's output is all zero

[Sean-xiang]

I'm using Turbo encoder and decoder to simulate text transmission , but the trubo decoder's output is all zero .
Please tell me how to fix it ?

[merlinND]

Hello @Sean-xiang,

Could you please share the full source for your decoder and a minimal script that you use to test it?
These partial screenshots do not provide enough information.

[SebastianCa]

Hi @Sean-xiang,

As @merlinND mentioned, it’s difficult to identify the issue without seeing the entire code. However, it might be helpful to check the SNR values used in your simulation. There could be a clipping issue with the LLRs. Can you please check the values of llr?