How can I put LLR into vitdec?

I calculated the LLR of every bit, and then I want to put them into the encoder using "vitdec" in Matlab. But I cann't get the right curve. The range of the calculated LLRs is from -27 to 27, how could I quantified the LLRs?

Answer 1

[Walter Roberson]

See example at http://www.mathworks.com/help/comm/examples/llr-vs-hard-decision-demodulation.html